WO2008072896A1 - A porous organic-inorganic hybrid materials and an absorbent comprising the same - Google Patents
A porous organic-inorganic hybrid materials and an absorbent comprising the same Download PDFInfo
- Publication number
- WO2008072896A1 WO2008072896A1 PCT/KR2007/006472 KR2007006472W WO2008072896A1 WO 2008072896 A1 WO2008072896 A1 WO 2008072896A1 KR 2007006472 W KR2007006472 W KR 2007006472W WO 2008072896 A1 WO2008072896 A1 WO 2008072896A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- absorbent
- acid
- inorganic hybrid
- hybrid material
- organic
- Prior art date
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- 239000000463 material Substances 0.000 title claims abstract description 201
- 239000002250 absorbent Substances 0.000 title claims abstract description 134
- 230000002745 absorbent Effects 0.000 title claims abstract description 134
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 90
- 229910001868 water Inorganic materials 0.000 claims abstract description 83
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims abstract description 70
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 69
- 238000010521 absorption reaction Methods 0.000 claims abstract description 68
- 238000002360 preparation method Methods 0.000 claims abstract description 41
- 239000011148 porous material Substances 0.000 claims abstract description 35
- 229910052742 iron Inorganic materials 0.000 claims abstract description 31
- 238000006243 chemical reaction Methods 0.000 claims description 63
- 238000000034 method Methods 0.000 claims description 37
- 239000002253 acid Substances 0.000 claims description 26
- 229910052751 metal Inorganic materials 0.000 claims description 24
- 239000002184 metal Substances 0.000 claims description 24
- 150000002894 organic compounds Chemical class 0.000 claims description 20
- 150000001450 anions Chemical class 0.000 claims description 17
- 239000002904 solvent Substances 0.000 claims description 17
- 239000013078 crystal Substances 0.000 claims description 15
- 238000005485 electric heating Methods 0.000 claims description 13
- -1 halogen anions Chemical class 0.000 claims description 13
- 239000000383 hazardous chemical Substances 0.000 claims description 13
- KKEYFWRCBNTPAC-UHFFFAOYSA-N benzene-dicarboxylic acid Natural products OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 claims description 12
- 150000001875 compounds Chemical class 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 12
- 239000012535 impurity Substances 0.000 claims description 12
- 230000001678 irradiating effect Effects 0.000 claims description 12
- 239000012855 volatile organic compound Substances 0.000 claims description 12
- 229910017604 nitric acid Inorganic materials 0.000 claims description 11
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 10
- UJMDYLWCYJJYMO-UHFFFAOYSA-N benzene-1,2,3-tricarboxylic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1C(O)=O UJMDYLWCYJJYMO-UHFFFAOYSA-N 0.000 claims description 10
- 229910017053 inorganic salt Inorganic materials 0.000 claims description 10
- XTUBPKVLOAIMQY-UHFFFAOYSA-H chromium(3+);terephthalate Chemical compound [Cr+3].[Cr+3].[O-]C(=O)C1=CC=C(C([O-])=O)C=C1.[O-]C(=O)C1=CC=C(C([O-])=O)C=C1.[O-]C(=O)C1=CC=C(C([O-])=O)C=C1 XTUBPKVLOAIMQY-UHFFFAOYSA-H 0.000 claims description 9
- 239000012692 Fe precursor Substances 0.000 claims description 8
- 239000013110 organic ligand Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 239000002105 nanoparticle Substances 0.000 claims description 7
- 239000012071 phase Substances 0.000 claims description 7
- 239000012808 vapor phase Substances 0.000 claims description 7
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 6
- 208000008842 sick building syndrome Diseases 0.000 claims description 6
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 239000003446 ligand Substances 0.000 claims description 5
- 239000012528 membrane Substances 0.000 claims description 5
- 239000010409 thin film Substances 0.000 claims description 5
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 4
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 150000001768 cations Chemical class 0.000 claims description 4
- 229910052731 fluorine Inorganic materials 0.000 claims description 4
- WREDNSAXDZCLCP-UHFFFAOYSA-N methanedithioic acid Chemical group SC=S WREDNSAXDZCLCP-UHFFFAOYSA-N 0.000 claims description 4
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- WLJVNTCWHIRURA-UHFFFAOYSA-N pimelic acid Chemical compound OC(=O)CCCCCC(O)=O WLJVNTCWHIRURA-UHFFFAOYSA-N 0.000 claims description 4
- 239000002243 precursor Substances 0.000 claims description 4
- 229910052720 vanadium Inorganic materials 0.000 claims description 4
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims description 3
- JFCQEDHGNNZCLN-UHFFFAOYSA-N anhydrous glutaric acid Natural products OC(=O)CCCC(O)=O JFCQEDHGNNZCLN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 150000001732 carboxylic acid derivatives Chemical class 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000011737 fluorine Substances 0.000 claims description 3
- 150000002505 iron Chemical class 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- KYTZHLUVELPASH-UHFFFAOYSA-N naphthalene-1,2-dicarboxylic acid Chemical compound C1=CC=CC2=C(C(O)=O)C(C(=O)O)=CC=C21 KYTZHLUVELPASH-UHFFFAOYSA-N 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- RTBFRGCFXZNCOE-UHFFFAOYSA-N 1-methylsulfonylpiperidin-4-one Chemical compound CS(=O)(=O)N1CCC(=O)CC1 RTBFRGCFXZNCOE-UHFFFAOYSA-N 0.000 claims description 2
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 claims description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical group C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 claims description 2
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 claims description 2
- IKHGUXGNUITLKF-XPULMUKRSA-N acetaldehyde Chemical compound [14CH]([14CH3])=O IKHGUXGNUITLKF-XPULMUKRSA-N 0.000 claims description 2
- 229960000250 adipic acid Drugs 0.000 claims description 2
- 235000011037 adipic acid Nutrition 0.000 claims description 2
- 229910052783 alkali metal Inorganic materials 0.000 claims description 2
- 150000001340 alkali metals Chemical class 0.000 claims description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 2
- 125000003368 amide group Chemical group 0.000 claims description 2
- 125000003277 amino group Chemical group 0.000 claims description 2
- 229910052787 antimony Inorganic materials 0.000 claims description 2
- 229910052785 arsenic Inorganic materials 0.000 claims description 2
- 229910052797 bismuth Inorganic materials 0.000 claims description 2
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 claims description 2
- 229910052793 cadmium Inorganic materials 0.000 claims description 2
- 125000002843 carboxylic acid group Chemical group 0.000 claims description 2
- 235000019253 formic acid Nutrition 0.000 claims description 2
- 125000000524 functional group Chemical group 0.000 claims description 2
- 229910052733 gallium Inorganic materials 0.000 claims description 2
- 229910052732 germanium Inorganic materials 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 229910052735 hafnium Inorganic materials 0.000 claims description 2
- 229910052736 halogen Inorganic materials 0.000 claims description 2
- 125000001841 imino group Chemical group [H]N=* 0.000 claims description 2
- 229910052738 indium Inorganic materials 0.000 claims description 2
- 229910052741 iridium Inorganic materials 0.000 claims description 2
- LVPMIMZXDYBCDF-UHFFFAOYSA-N isocinchomeronic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)N=C1 LVPMIMZXDYBCDF-UHFFFAOYSA-N 0.000 claims description 2
- 229910052745 lead Inorganic materials 0.000 claims description 2
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 claims description 2
- 150000007522 mineralic acids Chemical class 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- KVQQRFDIKYXJTJ-UHFFFAOYSA-N naphthalene-1,2,3-tricarboxylic acid Chemical compound C1=CC=C2C(C(O)=O)=C(C(O)=O)C(C(=O)O)=CC2=C1 KVQQRFDIKYXJTJ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052758 niobium Inorganic materials 0.000 claims description 2
- XKLJHFLUAHKGGU-UHFFFAOYSA-N nitrous amide Chemical class ON=N XKLJHFLUAHKGGU-UHFFFAOYSA-N 0.000 claims description 2
- 229910052762 osmium Inorganic materials 0.000 claims description 2
- 235000006408 oxalic acid Nutrition 0.000 claims description 2
- 229910052763 palladium Inorganic materials 0.000 claims description 2
- 229910052697 platinum Inorganic materials 0.000 claims description 2
- 229920005547 polycyclic aromatic hydrocarbon Polymers 0.000 claims description 2
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 claims description 2
- 125000003373 pyrazinyl group Chemical group 0.000 claims description 2
- GJAWHXHKYYXBSV-UHFFFAOYSA-N pyridinedicarboxylic acid Natural products OC(=O)C1=CC=CN=C1C(O)=O GJAWHXHKYYXBSV-UHFFFAOYSA-N 0.000 claims description 2
- 229910052702 rhenium Inorganic materials 0.000 claims description 2
- 229910052703 rhodium Inorganic materials 0.000 claims description 2
- 229910052707 ruthenium Inorganic materials 0.000 claims description 2
- 229910052709 silver Inorganic materials 0.000 claims description 2
- 229910052712 strontium Inorganic materials 0.000 claims description 2
- 125000000542 sulfonic acid group Chemical group 0.000 claims description 2
- 229910052715 tantalum Inorganic materials 0.000 claims description 2
- 229910052716 thallium Inorganic materials 0.000 claims description 2
- 229910052718 tin Inorganic materials 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 229910052727 yttrium Inorganic materials 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- XTWMRBJKMXZQDS-UHFFFAOYSA-N iron;terephthalic acid Chemical compound [Fe].OC(=O)C1=CC=C(C(O)=O)C=C1 XTWMRBJKMXZQDS-UHFFFAOYSA-N 0.000 claims 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims 1
- BFPVXOYPQMBHDJ-UHFFFAOYSA-H dialuminum;terephthalate Chemical compound [Al+3].[Al+3].[O-]C(=O)C1=CC=C(C([O-])=O)C=C1.[O-]C(=O)C1=CC=C(C([O-])=O)C=C1.[O-]C(=O)C1=CC=C(C([O-])=O)C=C1 BFPVXOYPQMBHDJ-UHFFFAOYSA-H 0.000 claims 1
- 238000001035 drying Methods 0.000 claims 1
- 229910052749 magnesium Inorganic materials 0.000 claims 1
- 238000003795 desorption Methods 0.000 description 29
- 230000000052 comparative effect Effects 0.000 description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 18
- 239000011651 chromium Substances 0.000 description 18
- 238000002441 X-ray diffraction Methods 0.000 description 15
- 229910021536 Zeolite Inorganic materials 0.000 description 10
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 10
- 239000002245 particle Substances 0.000 description 10
- 239000010457 zeolite Substances 0.000 description 10
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 9
- 229910052757 nitrogen Inorganic materials 0.000 description 9
- 238000001179 sorption measurement Methods 0.000 description 9
- 239000004809 Teflon Substances 0.000 description 8
- 229920006362 Teflon® Polymers 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- QPJSUIGXIBEQAC-UHFFFAOYSA-N n-(2,4-dichloro-5-propan-2-yloxyphenyl)acetamide Chemical compound CC(C)OC1=CC(NC(C)=O)=C(Cl)C=C1Cl QPJSUIGXIBEQAC-UHFFFAOYSA-N 0.000 description 8
- 239000012153 distilled water Substances 0.000 description 7
- 238000001027 hydrothermal synthesis Methods 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 description 6
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 6
- 239000013291 MIL-100 Substances 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 6
- QMKYBPDZANOJGF-UHFFFAOYSA-N benzene-1,3,5-tricarboxylic acid Chemical compound OC(=O)C1=CC(C(O)=O)=CC(C(O)=O)=C1 QMKYBPDZANOJGF-UHFFFAOYSA-N 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 6
- NROKBHXJSPEDAR-UHFFFAOYSA-M potassium fluoride Chemical compound [F-].[K+] NROKBHXJSPEDAR-UHFFFAOYSA-M 0.000 description 6
- 239000011541 reaction mixture Substances 0.000 description 6
- 230000035484 reaction time Effects 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 239000013585 weight reducing agent Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- KYQCOXFCLRTKLS-UHFFFAOYSA-N Pyrazine Chemical compound C1=CN=CC=N1 KYQCOXFCLRTKLS-UHFFFAOYSA-N 0.000 description 4
- OUTGAKRLHPHHLF-UHFFFAOYSA-K benzene-1,2,3-tricarboxylate;iron(3+) Chemical compound [Fe+3].[O-]C(=O)C1=CC=CC(C([O-])=O)=C1C([O-])=O OUTGAKRLHPHHLF-UHFFFAOYSA-K 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 239000007783 nanoporous material Substances 0.000 description 4
- 239000011698 potassium fluoride Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- 235000019270 ammonium chloride Nutrition 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 125000004432 carbon atom Chemical group C* 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 235000003270 potassium fluoride Nutrition 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 3
- 229910052723 transition metal Inorganic materials 0.000 description 3
- 150000003624 transition metals Chemical class 0.000 description 3
- 238000001291 vacuum drying Methods 0.000 description 3
- ROFVEXUMMXZLPA-UHFFFAOYSA-N Bipyridyl Chemical compound N1=CC=CC=C1C1=CC=CC=N1 ROFVEXUMMXZLPA-UHFFFAOYSA-N 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 2
- PCNDJXKNXGMECE-UHFFFAOYSA-N Phenazine Natural products C1=CC=CC2=NC3=CC=CC=C3N=C21 PCNDJXKNXGMECE-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 150000001298 alcohols Chemical class 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
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- 229910010272 inorganic material Inorganic materials 0.000 description 2
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- 229910052747 lanthanoid Inorganic materials 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 239000012621 metal-organic framework Substances 0.000 description 2
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- 239000000843 powder Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 238000010189 synthetic method Methods 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- BDAGIHXWWSANSR-UHFFFAOYSA-M Formate Chemical compound [O-]C=O BDAGIHXWWSANSR-UHFFFAOYSA-M 0.000 description 1
- 239000013177 MIL-101 Substances 0.000 description 1
- 239000013178 MIL-101(Cr) Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 239000003377 acid catalyst Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- YYXHRUSBEPGBCD-UHFFFAOYSA-N azanylidyneiron Chemical compound [N].[Fe] YYXHRUSBEPGBCD-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- JVCSQUWRWAUUII-UHFFFAOYSA-N carboxy cyclohexyl carbonate Chemical group OC(=O)OC(=O)OC1CCCCC1 JVCSQUWRWAUUII-UHFFFAOYSA-N 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- ZMIGMASIKSOYAM-UHFFFAOYSA-N cerium Chemical compound [Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce] ZMIGMASIKSOYAM-UHFFFAOYSA-N 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229920000592 inorganic polymer Polymers 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 150000002602 lanthanoids Chemical class 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 125000005647 linker group Chemical group 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 125000006574 non-aromatic ring group Chemical group 0.000 description 1
- OXUCOTSGWGNWGC-UHFFFAOYSA-N octane Chemical compound CCCCCCC[CH2-] OXUCOTSGWGNWGC-UHFFFAOYSA-N 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000013259 porous coordination polymer Substances 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 239000012047 saturated solution Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000004729 solvothermal method Methods 0.000 description 1
- KDYFGRWQOYBRFD-UHFFFAOYSA-L succinate(2-) Chemical compound [O-]C(=O)CCC([O-])=O KDYFGRWQOYBRFD-UHFFFAOYSA-L 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
- B01J20/28033—Membrane, sheet, cloth, pad, lamellar or mat
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/28—Selection of materials for use as drying agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/223—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material containing metals, e.g. organo-metallic compounds, coordination complexes
- B01J20/226—Coordination polymers, e.g. metal-organic frameworks [MOF], zeolitic imidazolate frameworks [ZIF]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
- B01J20/28004—Sorbent size or size distribution, e.g. particle size
- B01J20/28007—Sorbent size or size distribution, e.g. particle size with size in the range 1-100 nanometers, e.g. nanosized particles, nanofibers, nanotubes, nanowires or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F11/00—Compounds containing elements of Groups 6 or 16 of the Periodic Table
- C07F11/005—Compounds containing elements of Groups 6 or 16 of the Periodic Table compounds without a metal-carbon linkage
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F15/00—Compounds containing elements of Groups 8, 9, 10 or 18 of the Periodic Table
- C07F15/02—Iron compounds
- C07F15/025—Iron compounds without a metal-carbon linkage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/50—Aspects relating to the use of sorbent or filter aid materials
- B01J2220/68—Superabsorbents
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24149—Honeycomb-like
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/10—Scrim [e.g., open net or mesh, gauze, loose or open weave or knit, etc.]
Definitions
- the present invention relates to a method for preparing porous organic-inorganic hybrid material(s), an absorbent comprising the same, and the catalytic uses of the organic-inorganic hybrid material(s). More particularly, the present invention relates to an absorbent that can easily absorb and desorb at a low temperature of 100 0 C and below, and has a large difference between the absorption amount in absorption condition and the absorption amount in desorption condition. Also, the present invention relates to an absorbent using the porous organic-inorganic hybrid material(s) having properties such as nano size pores and large surface area and pore volume.
- the present invention relates to a novel method for preparing porous organic- inorganic hybrid material(s) wherein use of hydrofluoric acid has been eliminated, and a novel use as an absorbent of the porous organic-inorganic hybrid material(s) obtained by said preparation method.
- the present invention relates to a water absorbent that can be used in humidifiers, dehumidifiers and coolers/ heaters, which can easily absorb or desorb at 100 0 C and below, and has a great absorption amount per weight of the absorbent. Also, the present invention relates to use of the porous organic-inorganic hybrid material(s) of the present invention having a large surface area and uniform porous properties as an absorbent having excellent absorption efficiency against specific hazardous materials.
- the porous organic-inorganic hybrid material(s) prepared according to the present invention can be defined as porous organic-inorganic polymer compounds formed by binding a central metal ion (e.g., iron ion) with an organic ligand.
- the compounds are crystalline compounds having a pore structure of a molecular size or nano size and containing both an organic compound and an inorganic compounds within the framework structure.
- porous organic-inorganic hybrid material(s) has a broad meaning, and in general, it is also referred to as "porous coordination polymers” [Angew. Chem. Intl. Ed., 43, 2334 (2004)], or “metal-organic frameworks” [Chem. Soc. Rev., 32, 276 (2003)].
- Said material(s) has large surface area and pores of a molecular size or nano size, and thus can be used not only for adsorbents, gas storing materials, sensors, membranes, functional thin films, catalysts and catalyst carriers, etc., but also for including guest molecules smaller than their pore size or separating molecules depending on sizes of the molecules by using their pores. Thus, they have gained much importance.
- Porous organic-inorganic hybrid material(s) have been prepared by various methods. Usually, they have been prepared by a hydrothermal synthesis reacting at high temperature by using water as a solvent or by reacting near room temperature by using solvent diffusion, or a solvothermal synthesis using an organic solvent [Microporous Mesoporous Mater., 73, 15 (2004); Accounts of Chemical Research, 38, 217 (2005)].
- Porous organic-inorganic hybrid material(s) have been recognized to have unique features that they can be used not only for catalysts, catalyst carriers, adsorbents, ion exchanging materials and gas storing materials, but also for storing, preparing and separating nanomaterials, and for nanoreactors, due to their characteristics such as large surface area, crystalline structure of a very high regularity and relatively high thermal stability, etc.
- Cr-MIL-100 which is an organic-inorganic hybrid material(s) of MIL-100 structure (MIL: Materials of Institute Lavoisier), has been reported [Bulletin of Korean Chemical Society vol.26, p.88O (2005)].
- porous organic-inorganic hybrid material(s) by hydrothermal synthesis, in general, a mixed-acid comprising nitric acid, hydrofluoric acid, etc. is used in order to regulate the rate of forming crystals.
- MIL-100 represented by formula of Cr O(H O) F[C H -(CO ) ] -nH O (n ⁇ 14.5)
- MIL-101 represented by formula of Cr F(H O) 0[C H (CO ) ] -nH O (n ⁇ 25)
- the organic-inorganic hybrid material(s) of a metal-organic framework structure where the Cr component is substituted by another metal have not been reported yet.
- the dehumidifier can utilize the absorbent having a property of absorbing water at low temperature and desorbing water when it is heated to high temperature.
- the absorbent when an absorbent is used in coolers/heaters, for heating, the absorbent can be used instead of the humidifier by absorbing the outdoor moisture at low temperature and introducing the moisture to the indoors to desorb in the indoors at high temperature, and for cooling, a comfortable indoors atmosphere can be obtained by absorbing the indoor moisture at low temperature and desorbing the moisture in the outdoors at high temperature to send it to the outdoors.
- Air-conditioners and humidity controllers applying such concept were suggested in US 6,978,635, 6,959,875, 6,675,601, etc.
- active carbon and hydrophobic zeolite were mainly used as absorbents that can remove specific hazardous materials of vapor phase or particulate phase comprising volatile organic compounds (VOCs).
- Active carbon has lots of nano pores, and thus has a very large surface area, and a strong absorption strength against non-polar molecules, and thus has an excellent effect in removing exhaust gas, removing smell and decoloring
- zeolite is a hydrophilic absorbent having a pore diameter of about 3-10 , and thus has a strong absorption property to carbon monoxide, carbon dioxide and water.
- most absorbents only have hy- drophobic properties, and thus have disadvantages that they cannot effectively absorb and remove volatile organic compounds containing water.
- the first embodiment of the present invention provides an absorbent that has a high water absorption amount and that can easily desorb at a relatively low temperature of 100 0 C and below, for example at 60-80 0 C, and an absorbent having excellent absorption amount and absorption property by using the porous organic- inorganic hybrid material(s) containing iron.
- the second embodiment of the present invention provides a method for preparing and purifying porous organic-inorganic hybrid material(s) having a relatively small nano particle size through a environmental friendly novel preparation method, wherein hydrofluoric acid is not used at all in some cases when preparing porous organic- inorganic hybrid material(s), and provides the use of porous organic-inorganic hybrid material(s) prepared by said method as an absorbent. Also, it is an object of the present invention to provide a method for preparing porous organic-inorganic hybrid mater ial(s) through a quick and continuous-type manner by irradiating microwaves. In particular, with regard to the use as an absorbent, it is an object of the present invention to provide an absorbent having excellent absorption efficiency against water, or specific hazardous materials such as VOC, hazardous materials causing a sick house syndrome.
- the first embodiment of the present invention relates to a water absorbent.
- the absorbent is characterized by using porous organic-inorganic hybrid material(s) containing environmental friendly iron as a metal component.
- the present invention provides an absorbent using porous organic-inorganic hybrid material(s) containing iron that can easily desorb at low temperature and that has a great difference between the absorption amount at low temperature and the absorption amount at high temperature.
- the absorbent according to the present invention has a surface area larger than 1,700 m /g and a pore volume larger than 0.8 mL/g, and contains both organic and inorganic compounds within the framework structure.
- the porous organic-inorganic hybrid material(s) containing iron is characterized in that it is prepared by a reaction between an iron precursor and an organic ligand compound that can be coordinated with the iron precursor.
- the surface area and pore volume are smaller than the above values, it does not have a strong effect as a water absorbent. Also, it is better if the surface area and pore volume are as large as possible.
- the upper limit of the surface area is about 10,000 m /g, and the upper limit of the pore volume is about 10 mL/g.
- the porous organic- inorganic hybrid material(s) containing iron of the present invention has a surface area of 1,700-2,500 m 2 /g and a pore volume of 0.8-1.2 mL/g.
- the ratio of water absorption rate at 100 0 C against the water absorption amount at room temperature is 0.5-1.
- 50 % and less of the water absorbed is desorbed at a temperature of 100 0 C and below, and thus the desorption property is not good at low temperature.
- the absorbent of the present invention it has a property that at least 80 %, more preferably at least 90 %, of the water absorbed is desorbed at a temperature of 100 0 C and below.
- the water absorption amount at a relative humidity of 60-80 % is 0.4-0.7 g/g of weight of the absorbent, and thus the water absorbent amount per weight of the absorbent is very high. Therefore, the water absorbent of the present invention has a very high water absorption amount.
- the absorbent can easily desorb and has a faster desorption rate than the conventional absorbent, and thus is suitable to be used to adjust humidity.
- the present invention provides a novel method for efficiently preparing porous organic-inorganic hybrid material(s).
- the present invention provides a method for preparing porous organic- inorganic hybrid material(s) having nano size particles wherein use of hydrofluoric acid has been eliminated in the hydrothermal synthesis.
- said preparation method of the present invention is characterized by comprising a method of purifying in order to increase the surface area of the porous organic-inorganic hybrid material(s).
- the present invention relates to a novel use characterized by using the porous organic- inorganic hybrid material(s) obtained by the novel preparation method as a water absorbent, an absorbent for removing specific hazardous materials such as VOC (volatile organic compounds), etc.
- Said specific hazardous materials comprise materials in vapor phase or particular phase such as formaldehyde, acetaldehyde, tar, nitrosoamines and polycyclicaromatic hydrocarbons, causing a sick house syndrome in addition to volatile organic compounds.
- the present invention relates to a novel use characterized by using the porous organic-inorganic hybrid material(s) obtained by the novel preparation method as a water absorbent, an absorbent for removing specific hazardous materials in vapor phase or particular phase.
- the porous organic- inorganic hybrid material(s) containing iron used as an absorbent according to the present invention is prepared by a method comprising following steps:
- any organic compound capable of coordination bonding can be used.
- functional groups that can coordinate can be -CO , -N, carboxylic acid group, anion group of carboxylic acid, amino group (-NH ), imino group (
- organic compounds having at least two sites for coordination are advantageous.
- the organic compound may be a neutral organic compound such as bipyridine, pyrazine, etc., anionic organic compounds, e.g., anions of carbonic acid such as terephthalate, naphthalenedicarboxylate, benzenetricarboxylate, glutarate, succinate, etc., and cationic materials, if these have a site for coordination.
- any anions e.g., linear carbonic acid anions such as formate, and anions having non- aromatic rings such as cyclohexyldicarbonate can be used.
- an organic compound which may be converted to be coordinated in reaction condition due to a potential site for coordination can be used as well. That is, even though organic acids such as terephthalic acid are used, the organic compound such as terephthalate may be bonded to a metal component, after reaction.
- organic compounds which can be used include an organic acid or anion thereof selected from benzenedicarboxylic acid, naphthalenedicarboxylic acid, benzenetricarboxylic acid, naphthalenetricarboxylic acid, pyridinedicarboxylic acid, bipyridyldicarboxylic acid, formic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, hexanedioic acid, heptanedioic acid and cyclohexyldicarboxylic acid, pyrazine, bipyridine, etc. Further, one or more organic compounds can be mixed together to be used. It is preferable to use terephthalic acid or benzenetricarboxylic acid.
- the method for preparing the porous organic-inorganic hybrid material(s) containing iron, the absorbent according to the present invention can be prepared by adding an iron precursor, an organic ligand, a solvent and a mixed-acid comprising hydrofluoric acid and nitric acid as a reaction promoter to the reactor and sealing it, and heating the reactor to 100-250 0 C while maintaining the reaction temperature using microwaves or electricity and maintaining the pressure to autogeneous pressure.
- the method for preparing organic-inorganic hybrid material(s) containing iron according to the present invention is characterized by using acid, preferably, a mixed-acid comprising hydrofluoric acid and nitric acid.
- acid preferably, a mixed-acid comprising hydrofluoric acid and nitric acid.
- the iron-containing organic-inorganic hybrid material(s) of the present invention show a remarkable improvement in crystallinity and decrease in crystal size in comparison with the conventional synthetic methods which use only hydrofluoric acid.
- organic-inorganic hybrid material(s) containing iron having a surface area larger than 1,700 m /g and a pore volume larger than 0.8 mL/g cannot be prepared.
- the BET surface area is 1,590 m /g and is remarkably lower than the BET surface area of 2,050 m /g using a mixed- acid.
- the pore volume is 1.0 ml/g in case of using a mixed-acid, whereas the pore volume is 0.7 ml/g and lower in case of using hydrofluoric acid.
- a mixed-acid although it has a very short reaction time (within 2 minutes when using microwaves) compared with the case of not using a mixed-acid, it has been confirmed to have an effect such that the crystallinity is improved and the yield is almost the same.
- the desired iron-containing organic-inorganic hybrid material(s) of the present invention can be prepared by using nitric acid and hydrofluoric acid in a molar ratio of 0.1-1:1-0.1 in a mixed- acid. If the molar ratio of nitric acid or hydrofluoric acid deviates from the above range, there are some disadvantages such that the yield is decreased and the reaction time elongated too much.
- a suitable solvent is required for preparing porous organic-inorganic hybrid material(s).
- any substance among water, alcohols, ketones and hydrocarbons can be used, and two or more solvents can be mixed together to be used.
- one or a mixture of at least two selected from water, alcohols having 1-10 carbon atoms such as methanol, ethanol, propanol, ketones having 2-10 carbon atoms such as acetone, methylethylketone, and hydrocarbons having 5-20 carbon atoms such as hexane, heptane, octane can be used. More preferably, water can be used.
- Said iron precursor can be mixed with an organic compound in a ratio of 1:0.1-10
- molar ratio Said ratio can be properly adjusted depending on the kind of the metal component and organic compound.
- iron precursor iron salt such as nitrogen iron, iron in the form of metal powder, etc.
- organic ligand such as terephthalic acid or benzenetricarboxylic acid is more preferable.
- the reaction temperature for preparing porous organic- inorganic hybrid material(s) is not substantially limited. However, a temperature of at least 100 0 C is suitable. A temperature of 100-250 0 C is preferable, and a temperature of 150-220 0 C is more preferable. If said reaction temperature is below 100 0 C and thus too low, the reaction rate is slow and thus not efficient, and if the reaction temperature exceeds 250 0 C and thus too high, materials having no pores can be easily obtained and the reaction rate becomes too fast so that impurities can be easily included. Also, the inner pressure of the reactor becomes higher, which makes the constitution of the reactor not economic.
- the reactor pressure is not substantially limited, it is convenient to synthesize the materials at autogeneous pressure of the reaction materials at reaction temperature.
- the reaction may be performed at high pressure by adding inert gas such as nitrogen, helium.
- microwaves are irradiated as a heat source in said reaction, microwaves of a frequency of about 300 MHz - 300 GHz can be used for heating the reaction material.
- microwaves of a frequency of 2.45 GHz, 0.915 GHz are generally used in industries.
- the method irradiating microwaves has a shorter reaction time, a relatively smaller particle size of porous organic-inorganic hybrid material(s), and large surface area value compared with the method using electric heating, and thus has more excellent properties as a water absorbent.
- the absorption and desorption property within the first 10 minutes, more preferably the first 5 minutes are important. That is, although the absorption amount is large, if its rate is too slow, the absorbent may not be suitable to be used for humidifiers and dehumidifiers. However, as for the absorbent prepared by the method of irradiating microwaves among the absorbent according to the present invention, the absorption rate is very high, and the desorption rate is excellent, and thus the absorbent has properties more suitable to be used for such use.
- the water absorption amount was 0.35-0.45 g/g of weight of the absorbent, and thus the initial absorption rate is very high.
- the reaction can be performed by the batch-type reactor and the continuous -type reactor.
- the batch-type reactor has a low productivity per hour, and thus is suitable for producing a small amount of a porous organic-inorganic hybrid material(s).
- the continuous -type reactor needs a large amount of investment cost, but is suitable for mass-production.
- a reaction time of 1 minute ⁇ 8 hours is suitable. If the reaction time is too long, impurities can be easily included and the particles grow and thus it is difficult to make nano particles. If the reaction time is too short, the conversion rate of the reaction is low.
- a residence time of 1 minute ⁇ 1 hour is suitable.
- the residence time is too long, the productivity is low and large particles are obtained, and if the residence time is too short, the conversion rate of the reaction is low.
- a residence time of 1 minute ⁇ 20 minutes is more suitable.
- the reaction material may be stirred during the reaction, and a stirring rate of 100-1000 rpm is suitable.
- the reaction may be performed without the stirring process, which makes the constitution and operation of the reactor simple and easy for application.
- the reaction using microwaves is conducted in a very fast rate, it is preferable to enhance the uniformity and solubility of the reaction materials and to irradiate microwaves in a condition pre-treated to partly form crystal nuclei. If the reaction by microwaves is started in a condition that is not pre-treated, the reaction gets slow, or impurities can be easily included, or the uniformity of the particle size can get lower. However, the process itself gets more simple. Pre-treating can be performed by treating the reaction materials with supersonic waves or vigorously stirring. As for said pre- treating temperature, a temperature between room temperature and reaction temperature is preferable.
- the pre-treating effect is weak and if the pre-treating temperature is too high, impurities are easily generated and the pre-treating facility becomes complex. It is suitable that said pre-treating is conducted for 1 minute ⁇ 5 hours. If treated with supersonic waves, at least 1 minute is suitable, and if treated by stirring, at least 5 minutes is suitable.
- the pre-treating step by stirring it is preferable to stir the metal component and the organic compound in the presence of a solvent in 50-2,000 rpm for 5-600 minutes, and in case of performing the pre-treating step by irradiating supersonic waves, it is more preferable to irradiate supersonic waves of 15,000 Hz - 30 MHz for 1-600 minutes. If the pre-treating time is too short, the pre-treating effect is weak, and if the pre-treating time is too long, the pre-treating efficiency becomes low. Performing the pre-treating using supersonic waves is more preferable in terms of pre-treating time and uniformity of the reaction material.
- the second embodiment of the present invention relates to a method for preparing porous organic-inorganic hybrid material(s) comprising the following steps:
- step (3) can be performed optionally when necessary.
- the porous organic-inorganic hybrid material(s) prepared by said preparation method according to the present invention can be obtained as nanoparticles, and the size of said nano particle is about 450 nm or below. Also, the porous organic-inorganic hybrid material(s) prepared by said preparation method according to the present invention can be in a form of powder, thin film or membrane.
- porous organic-inorganic hybrid material(s) in a form of nanoparticles, thin film or membrane can be easily prepared by methods such as electric heating and irradiating microwaves after immersing the substrate to the mixed reaction solution.
- the preparation method of the porous organic-inorganic hybrid material(s) of the present invention prepares organic-inorganic hybrid material(s) having nano size particles wherein use of hydrofluoric acid has been eliminated in the hydrothermal synthesis for preparing nanoporous materials. Also, as a purifying method for increasing the surface area of the porous organic-inorganic hybrid material(s), the method is characterized by further comprising a step of purifying impurities within the pore of the organic-inorganic hybrid material(s) by treating them using inorganic salts such as ammonium chloride or potassium fluoride, etc. in addition to the solvent generally used.
- the porous organic-inorganic hybrid material(s) has a novel use as an absorbent.
- the absorbent of the porous organic-inorganic hybrid material(s) according to the present invention can easily perform absorption and desorption at a temperature of 100 0 C and below, and the absorption amount per weight of the absorbent is high.
- the absorbent can be used as a water absorbent that can be applied to humidifiers, dehumidifiers, and coolers/heaters.
- the porous organic-inorganic hybrid material(s) of the present invention having a large surface area and uniform pore properties can be used as an absorbent having excellent absorption efficiency against specific hazardous materials.
- any metal can be used as a metal component, which is one of components contained in porous organic-inorganic hybrid material(s).
- the representative metal components include Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Re, Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Hg, Mg, Ca, Sr, Ba, Sc, Y, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, Sb, Bi, etc.
- transition metals which easily form coordination compound are suitable.
- transition metals chromium, vanadium, iron, nickel, cobalt, copper, titanium and manganese, etc. are suitable, and chromium and iron are the most suitable one.
- representative elements forming a coordination compound and metals such as lanthanide can also be used.
- aluminum and silicon are suitable, and among lanthanide metals, cerium and lanthanum are suitable.
- metal source metal itself, and any compound of metal can be used.
- the organic compound which may be another component contained in the organic-inorganic hybrid material(s) and may act as a ligand, and the solvent used in the synthesis of the organic-inorganic hybrid material(s) are the same as those used in the first embodiment.
- an acid in particular, a mixed-acid comprising hydrofluoric acid along with nitric acid, hydrochloric acid and hydrofluoric acid can be used.
- the method for preparing porous organic-inorganic hybrid material(s) of the present invention is characterized by using an inorganic acid except hydrofluoric acid for preparing porous organic- inorganic hybrid material(s), in order to solve the above problems caused by using hydrofluoric acid.
- nanoporous organic-inorganic hybrid material(s) having a relatively small nano particle size can be prepared by said preparation method of the present invention without using hydrofluoric acid at all.
- impurities within the pore of nanoporous organic-inorganic hybrid material(s) can be efficiently removed by treating porous organic-inorganic hybrid material(s) using an inorganic salt, in particular, comprising monovalent or divalent cation selected from the group consisting of NH + 4 , alkali metal and alkali earth metal, and monovalent or divalent anion selected from the group consisting of halogen anion, carbonic acid ion (CO ), nitric acid ion and sulfuric acid ion. Accordingly, nanoporous organic-inorganic hybrid material(s) having large surface area can be obtained.
- an inorganic salt in particular, comprising monovalent or divalent cation selected from the group consisting of NH + 4 , alkali metal and alkali earth metal, and monovalent or divalent anion selected from the group consisting of halogen anion, carbonic acid ion (CO ), nitric acid ion and sulfuric acid ion.
- At least one inorganic salt selected from the group consisting of a salt comprising Ca + or Mg + as divalent cation and F , I or Br as monovalent anion, a salt comprising monovalent cation and divalent anion, NH F, KF, KI and KBr can be used as said inorganic salt.
- hydrothermal synthesis in a batch-type manner or continuous -type manner with irradiating microwaves can be used.
- the membrane or thin film of the organic-inorganic hybrid material(s) can be prepared by irradiating microwaves to heat after immersing the substrate to the mixed solution of the reaction materials from said step (1).
- novel porous organic-inorganic hybrid material(s) represented by formula of Cr OH(H O) O[C 6 H 4 (CO 2 ) 2 ] 3 -nH 2 O (n ⁇ 25) or formula of Fe 3 O(H2 O) 2 OH[C 6 H3 -(CO 2 ) 3 ] 2 -nH 2 O
- porous organic-inorganic hybrid material(s) obtained by the preparation method of the present invention can be used as a catalyst for oxidation reaction or as an acid catalyst.
- the porous organic-inorganic hybrid material(s) prepared according to the preparation method of the present invention can be used as an absorbent having excellent absorption and desorption efficiency.
- a very excellent efficiency can be achieved in humidifiers, dehumidifiers, etc. by using such properties.
- the porous organic-inorganic hybrid material(s) prepared according to the preparation method of the present invention as an absorbent of VOC, a material causing sick house syndrome, specific hazardous materials can be removed efficiently.
- porous organic-inorganic hybrid material(s) obtained by the preparation method of the present invention is used as a low-temperature water absorbent, it can be confirmed that it has a low temperature desorption property of 100 0 C and below, preferably 50 ⁇ 100 0 C, and a very fast water absorption rate compared with the conventional organic-inorganic nanoporous material(s) containing HF.
- the porous organic-inorganic hybrid material(s) containing iron prepared according to the present invention has a large absorption amount of water and has an excellent desorption amount property at low temperature.
- it can be used in dehumidifiers, humidifiers, heaters or coolers as an absorbent.
- it has an advantage that the desorption temperature is very low, and thus the cost for operating such equipments can be remarkably reduced.
- the porous organic-inorganic hybrid material(s) prepared according to the novel preparation method of the present invention do not use hydrofluoric acid during the hydrothermal synthesis, they are nanoporous materials having high crystallinity.
- their surface area can be increased by purifying them by removing the impurities within the pore of the nanoporous organic-inorganic hybrid material(s) by treating them with an inorganic salt such as ammonium chloride or potassium fluoride, etc.
- the porous organic-inorganic hybrid material(s) prepared according to the preparation method of the present invention can be used as an absorbent having excellent absorption and desorption efficiency.
- Fig. 1 is an X-ray diffraction pattern of iron benzenetricarboxylate organic- inorganic absorbent obtained by Example 1.
- Fig. 2 is an isotherm result of nitrogen adsorption of iron benzenetricarboxylate organic-inorganic absorbent obtained by Example 1.
- FIG. 3 is a graph showing the water absorption property of the absorbent using iron benzenetricarboxylate of Examples 1 & 2 and zeolite Y of Comparative Example 1 : it is the result of performing desorption of water absorbent at 70 0 C (Examples 1 & 2) or 200 0 C (Comparative Example 1), and absorption at a relative humidity of 68%.
- FIG. 4 is a graph showing the water desorption experiment results regarding the absorbent of Example 1 and Comparative Example 1 :
- Example 1 is the water desorption result at 70 0 C and Comparative Example 1 is the water desorption result at 200 0 C.
- Fig. 5 is an X-ray diffraction pattern of the chromiumterephthalate, which is a porous organic-inorganic hybrid material(s) prepared in accordance with the preparation method of Example 3 of the present invention.
- Fig. 6 is the result of X-ray diffraction patterns before and after purifying the chromiumterephthalate which is the porous organic-inorganic hybrid material(s) prepared in accordance with the purifying method of Example 3 of the present invention, wherein (a) is the pattern before purifying, and (b) is the pattern after purifying.
- Fig. 7 is an isotherm result of nitrogen adsorption of the chromiumterephthalate which is the porous organic-inorganic hybrid material(s) obtained by Example 4 of the present invention.
- Fig. 8 is electron microscope images of iron benzenetricarboxylate organic- inorganic hybrid material(s), which is the porous organic-inorganic hybrid material(s) obtained by Example 5 and Comparative Example 4 of the present invention.
- Fig. 9 is the result of the water absorption property of the porous organic-inorganic hybrid material(s) containing iron obtained by Examples 5 & 6 and Comparative Example 4 of the present invention.
- the X-ray diffraction pattern of the solid phase porous organic-inorganic hybrid material(s) obtained as above is as shown in Fig. 1.
- a porous organic-inorganic hybrid material(s) was prepared by the same method as Example 1, except that the organic-inorganic hybrid material(s) was prepared by heating for 144 hours by electric heating using the conventional Convection oven instead of irradiating microwaves as a heat source.
- XRD analysis it can be confirmed that relative intensity of the peak was different; however, a diffusion pattern was shown in the same position as Example 1 as for the crystal structure of the organic-inorganic hybrid material(s) prepared as above.
- nitrogen absorption experiment it showed a BET surface area of 1,820 m /g and a pore volume of 0.9 ml/g.
- Comparative Example 2 Preparation of porous organic-inorganic hybrid material(s) (Fe-BTC) using a single acid
- a porous organic-inorganic hybrid material(s) was prepared by the same method as
- Example 1 except that the hybrid material was prepared using a single acid which is not a nitric acid. After adding metallic iron 1 mmol, 5M HF (aqueous solution) 40ml and 1,3,5-benzenetricarboxylic acid (BTCA) 7 mmol to a Teflon reactor, distilled water was added. The final molar ratio of the reaction material was Fe:HF:BTCA:H 2
- the temperature of microwave irradiation to the organic-inorganic hybrid material(s) was 200 0 C, and the reaction was carried out for an hour.
- the yield of the solid phase porous organic-inorganic hybrid material(s) obtained was 82 %.
- the X-ray diffraction shape of the porous organic-inorganic hybrid material(s) was very similar to the results as in Example 1, but its overall peak strength is low. Also, as a result of a nitrogen adsorption experiment, it showed a BET surface area of 1,590 m /g and a pore volume of 0.7 ml/g.
- Example 1 as a result of performing the water absorption test in the same manner after vacuum drying zeolite Y at 200 0 C for 30 minutes, the water absorption amount was 0.35 g/g (Fig. 3). That is, although the desorption temperature of the absorbent of the example was 70 0 C, the absorbent of the present invention showed a water absorption amount that is at least 1.6 times larger.
- the absorbent of Example 1 prepared by using microwaves showed an absorption amount of 0.4 g/g after the first 5 minutes, and 0.56 g/g after 10 minutes, whereas the absorbent of Comparative Example 1 showed an absorption amount of 0.25 g/g after 5 minutes, and 0.28 g/g after 10 minutes.
- the absorbent according to Example 1 of the present invention has a very high initial absorption rate.
- Example 1 After the absorbent prepared in Example 1 and sodium zeolite Y (NaY) were put at the upper layer of the in a desiccator carrying the saturated solution of ammonium chloride and maintained for 3 days to sufficiently absorb water, the desorption amount was analyzed by the gravimetric method. As for the desorption condition, the weight reduction of the absorbent was measured while flowing out 300 ml/min of nitrogen. The desorption temperature of the absorbent of Example 1 was 70 0 C, and the desorption temperature of sodium zeolite Y (NaY) of Comparative Example 1 was 200 0C.
- Fig. 4 is a graph illustrating the result of weight reduction according to the progress of time by having the total weight of the absorbent absorbing water as 100 %.
- the fact that the weight reduction rate does not decrease any more means that all of the water that can be desorbed has been desorbed.
- the absolute water absorption amount of the absorbent of Example 1 is at least 2 times faster than that of the absorbent of Comparative Example 1. Also, the desorption rate of the first 5 minutes is higher in the absorbent of Example 1 than the absorbent of Comparative Example 1.
- the absorbent according to the present invention can easily desorb water at a temperature of 100 0 C, and that it has a high water absorption amount per unit weight. Using such properties, the absorbent is applied to humidifiers and dehumidifiers and is expected to present an excellent efficiency in adjusting humidity. [166] [167] Example 3 (Cr-BDC-I)
- the chromiumterephthalate which is a porous organic- inorganic hybrid material(s) obtained, does not contain F, and thus its structure is the same as MIL-101 but it does not include F in its structure, thus being materials that can be re r presented by J formula of Cr 3 OH(H 2 O) 20[C 6 H 4 (CO 2 ) 2 ] 3 -nH 2 O (n ⁇ 25).
- Organic-inorganic hybrid material(s) with improved surface area were prepared by removing impurities such as 1,4-benzenedicarboxylic acid and chromium oxide, etc. which does not bind within the crystalline structure present in pores of the porous materials by putting the porous organic-inorganic hybrid material(s) 1 g prepared in Example 3 in 50 ml of IM NH F and stirring it at 70 0 C. From the X-ray diffraction
- the shape of the X-ray diffraction pattern was similar to that of the Cr- MIL-100 structure which is the crystal structure previously published [Bulletin of Korean Chemical Society vol.26, p.880 (2005)].
- the chromiumterephthalate which is a porous organic-inorganic hybrid material(s) obtained, does not contain F, and thus its structure is the same as MIL-100, but it does not include F within its structure, and it is a material that can be represented by J formula of Fe 3 O(H 2 O) 2 OH[C 6 H 3 -(CO 2 ) 3 ] 2 -nH 2 O (n ⁇ 14.5).
- the surface area of the porous organic- inorganic hybrid material(s) was at least 1,700 m /g.
- the particle size became very small to 200-500 nm and below (Fig.8a).
- a porous organic-inorganic hybrid material(s) was prepared in the same method as
- Example 3 except that the organic-inorganic hybrid material(s) was prepared by heating for 6 hours by an electric heating using the conventional electric heating instead of irradiating microwaves as a heat source.
- XRD analysis it can be confirmed that relative intensity of the peak was different; however, a diffraction pattern was shown in the same position as Example 3 as for the crystal structure of the organic-inorganic hybrid material(s) prepared as above.
- analysis using an electron microscope a relatively large crystal whose particle size is 1 ⁇ m was obtained.
- Example 3 except that heating by microwaves irradiation was used instead of the electric heating in Example 3.
- the organic-inorganic hybrid material(s) was prepared by using microwaves reaction device of 2.5 GHz and maintaining the reaction temperature at 210 0 C for 40 minutes. The X-ray diffraction pattern analysis showed that this material has the same structure as in Example 3.
- Example 3 except that Fe was used instead of Cr(NO ) -9H O. Also, pure porous organic-inorganic hybrid material(s) was prepared using the post-treating step of Example 4. It can be known from the X-ray diffraction pattern that the material having the same structure as in Example 3 was obtained.
- An organic-inorganic hybrid material(s) was prepared in the same manner as in the post-treating step of Examples 3 & 4 except that VCl was used instead of Cr(NO ) •9H O as in Example 8.
- the X-ray diffraction pattern shows that the material having the same structure as in Example 3 was obtained.
- the electron microscope photograph shows that the organic-inorganic hybrid material(s) having uniform particle size of 50-80 nm was obtained.
- the porous organic- inorganic hybrid material(s) according to the present invention as a low-temperature water absorbent, it can be known that the absorbent can easily desorb at a temperature of 100 0 C and below, and using such property, it can achieve a very excellent efficiency in humidifiers, dehumidifiers, etc.
- a nanoporous organic-inorganic hybrid material(s) was prepared using hydrofluoric acid for preparing a reaction mixture in the preparation method as in Example 3.
- a nanoporous organic-inorganic hybrid material(s) was prepared using hydrofluoric acid for preparing a reaction mixture in the preparation method as in Example 5.
- the final molar ratio of the reaction mixture was Fe:HF:HNO :BTCA:H
- nanoporous organic-inorganic hybrid material(s) having the same crystallinity were prepared by the preparation method of the present invention that does not use hydrofluoric acid.
- the surface area increases by at least 10 % when treated with inorganic salt such as ammonium salt and potassium fluoride, etc.
- the nanoporous organic-inorganic hybrid material(s) prepared according to the preparation method of the present invention have very high activity as a catalyst.
- the porous organic-inorganic hybrid material(s) prepared according to the preparation method of the present invention can be used as an absorbent having excellent absorption and desorption efficiency.
- a very excellent efficiency as a humidifier, dehumidifier, etc. can be achieved using such properties.
- the porous organic-inorganic hybrid material(s) prepared according to the preparation method of the present invention as an absorbent of specific hazardous materials such as VOC, a material causing sick house syndrome, the specific hazardous materials in vapor phase and particulate phase can be removed efficiently.
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Abstract
The present invention relates to an absorbent using the porous organic-inorganic hybrid material(s) containing iron having a large surface area and a high pore volume, in particular, a water absorbent. Also, it relates to an absorbent that can be used in humidifiers, dehumidifiers and coolers/heaters, which can easily absorb or desorb at 100°C and below, and has a great absorption amount per weight of the absorbent. Also, the present invention relates to a novel preparation method of porous organic-inorganic hybrid material(s), in particular, a preparation method characterized by not using hydrofluoric acid, porous organic-inorganic hybrid material(s) prepared by said preparation method, and a use as an absorbent thereof.
Description
Description A POROUS ORGANIC-INORGANIC HYBRID MATERIALS
AND AN ABSORBENT COMPRISING THE SAME Technical Field
[1] The present invention relates to a method for preparing porous organic-inorganic hybrid material(s), an absorbent comprising the same, and the catalytic uses of the organic-inorganic hybrid material(s). More particularly, the present invention relates to an absorbent that can easily absorb and desorb at a low temperature of 100 0C and below, and has a large difference between the absorption amount in absorption condition and the absorption amount in desorption condition. Also, the present invention relates to an absorbent using the porous organic-inorganic hybrid material(s) having properties such as nano size pores and large surface area and pore volume.
[2]
[3] Also, the present invention relates to a novel method for preparing porous organic- inorganic hybrid material(s) wherein use of hydrofluoric acid has been eliminated, and a novel use as an absorbent of the porous organic-inorganic hybrid material(s) obtained by said preparation method.
[4]
[5] In particular, with regard to the novel use as an absorbent of the porous organic- inorganic hybrid material(s) according to the present invention, the present invention relates to a water absorbent that can be used in humidifiers, dehumidifiers and coolers/ heaters, which can easily absorb or desorb at 100 0C and below, and has a great absorption amount per weight of the absorbent. Also, the present invention relates to use of the porous organic-inorganic hybrid material(s) of the present invention having a large surface area and uniform porous properties as an absorbent having excellent absorption efficiency against specific hazardous materials.
[6]
[7] The porous organic-inorganic hybrid material(s) prepared according to the present invention can be defined as porous organic-inorganic polymer compounds formed by binding a central metal ion (e.g., iron ion) with an organic ligand. The compounds are crystalline compounds having a pore structure of a molecular size or nano size and containing both an organic compound and an inorganic compounds within the framework structure.
[8]
Background Art
[9] The term "porous organic-inorganic hybrid material(s)" has a broad meaning, and in
general, it is also referred to as "porous coordination polymers" [Angew. Chem. Intl. Ed., 43, 2334 (2004)], or "metal-organic frameworks" [Chem. Soc. Rev., 32, 276 (2003)].
[10]
[11] At present, scientific research is focused on materials developed by integrating molecule coordination bonding with material science. Said material(s) has large surface area and pores of a molecular size or nano size, and thus can be used not only for adsorbents, gas storing materials, sensors, membranes, functional thin films, catalysts and catalyst carriers, etc., but also for including guest molecules smaller than their pore size or separating molecules depending on sizes of the molecules by using their pores. Thus, they have gained much importance.
[12]
[13] Porous organic-inorganic hybrid material(s) have been prepared by various methods. Usually, they have been prepared by a hydrothermal synthesis reacting at high temperature by using water as a solvent or by reacting near room temperature by using solvent diffusion, or a solvothermal synthesis using an organic solvent [Microporous Mesoporous Mater., 73, 15 (2004); Accounts of Chemical Research, 38, 217 (2005)].
[14]
[15] Porous organic-inorganic hybrid material(s) have been recognized to have unique features that they can be used not only for catalysts, catalyst carriers, adsorbents, ion exchanging materials and gas storing materials, but also for storing, preparing and separating nanomaterials, and for nanoreactors, due to their characteristics such as large surface area, crystalline structure of a very high regularity and relatively high thermal stability, etc. In this regard, Cr-MIL-100, which is an organic-inorganic hybrid material(s) of MIL-100 structure (MIL: Materials of Institute Lavoisier), has been reported [Bulletin of Korean Chemical Society vol.26, p.88O (2005)].
[16]
[17] However, as for the organic-inorganic hybrid material(s) containing Cr as stated above, due to the Cr component that is harmful to the human body, its use is relatively limited. In particular, iron-organic-inorganic hybrid material(s) having Fe as a central metal which is not harmful to the human body cannot be easily formed by the synthetic method of the organic-inorganic hybrid material(s) containing the Cr component, and thus development of a novel preparation method for said materials has been needed.
[18]
[19] Also, as for the synthesis of porous organic-inorganic hybrid material(s) by hydrothermal synthesis, in general, a mixed-acid comprising nitric acid, hydrofluoric acid, etc. is used in order to regulate the rate of forming crystals. As for representative
porous organic-inorganic hybrid material(s) prepared by the hydrothermal synthesis, MIL-100 (Cr) represented by formula of Cr O(H O) F[C H -(CO ) ] -nH O (n~14.5) and MIL-101 (Cr) represented by formula of Cr F(H O) 0[C H (CO ) ] -nH O (n~25) have been reported [Science 23, 2040 (2005); Accounts of Chemical Research, 38, 217 (2005)]. The organic-inorganic hybrid material(s) of a metal-organic framework structure where the Cr component is substituted by another metal have not been reported yet.
[20]
[21] Meanwhile, an absorbent that can easily absorb and desorb water has various uses.
For example, the dehumidifier can utilize the absorbent having a property of absorbing water at low temperature and desorbing water when it is heated to high temperature. Also, when an absorbent is used in coolers/heaters, for heating, the absorbent can be used instead of the humidifier by absorbing the outdoor moisture at low temperature and introducing the moisture to the indoors to desorb in the indoors at high temperature, and for cooling, a comfortable indoors atmosphere can be obtained by absorbing the indoor moisture at low temperature and desorbing the moisture in the outdoors at high temperature to send it to the outdoors. Air-conditioners and humidity controllers applying such concept were suggested in US 6,978,635, 6,959,875, 6,675,601, etc. However, the patents do not mention on the absorbent used in such devices in detail, but only mention that silica gel, zeolite, ion exchange resin are used, or that an absorbent is used. Also, such absorbent not only has a low absorption amount, but also causes the operation cost to rise by requiring a high temperature of at least 1000C even for desorption.
[22]
[23] Therefore, it is necessary to develop an absorbent that can desorb at low temperature and has a large difference between absorption amount and desorption amount. However, there were always problems such that if the absorption amount increases, it is difficult to desorb, and in case the absorption amount is low, the difference between the absorption amount and the desorption amount is not great.
[24]
[25] Also, until now, active carbon and hydrophobic zeolite were mainly used as absorbents that can remove specific hazardous materials of vapor phase or particulate phase comprising volatile organic compounds (VOCs). Active carbon has lots of nano pores, and thus has a very large surface area, and a strong absorption strength against non-polar molecules, and thus has an excellent effect in removing exhaust gas, removing smell and decoloring, whereas zeolite is a hydrophilic absorbent having a pore diameter of about 3-10 , and thus has a strong absorption property to carbon monoxide, carbon dioxide and water. However, most absorbents only have hy-
drophobic properties, and thus have disadvantages that they cannot effectively absorb and remove volatile organic compounds containing water. [26]
Disclosure of Invention
Technical Problem
[27] Accordingly, the first embodiment of the present invention provides an absorbent that has a high water absorption amount and that can easily desorb at a relatively low temperature of 100 0C and below, for example at 60-80 0C, and an absorbent having excellent absorption amount and absorption property by using the porous organic- inorganic hybrid material(s) containing iron.
[28]
[29] Therefore, it is an object of the present invention to provide a water absorbent that has a high water absorption amount and that can easily desorb at a relatively low temperature.
[30]
[31] More particularly, it is an object of the present invention to provide a water absorbent using porous organic-inorganic hybrid material(s) containing iron having a large surface area and a large pore volume as a substance that has a high water absorption amount and that can easily desorb at a relatively low temperature.
[32]
[33] Also, it is another object of the present invention to provide a method for preparing porous organic-inorganic hybrid material(s) containing iron having a large surface area and a large pore volume.
[34]
[35] An iron precursor containing the environmental friendly Fe instead of Cr as the metal component contained in the conventional porous organic-inorganic hybrid material(s) is reacted with an organic ligand. In case of performing the crystallization by heating the mixture with a solvent in the presence of a mixed-acid comprising nitric acid and hydrofluoric acid, a porous organic-inorganic hybrid material(s) containing iron having a large surface area and a large pore volume such as a surface area larger than 1,700 m /g and a pore volume larger than 0.8 ml/g is prepared. It has been confirmed that when this is used as a water absorbent, water can be easily desorbed at a temperature of 1000C and below, and that the water absorption amount per weight of the absorbent is very high, and the present invention was completed accordingly.
[36]
[37] The second embodiment of the present invention provides a method for preparing and purifying porous organic-inorganic hybrid material(s) having a relatively small
nano particle size through a environmental friendly novel preparation method, wherein hydrofluoric acid is not used at all in some cases when preparing porous organic- inorganic hybrid material(s), and provides the use of porous organic-inorganic hybrid material(s) prepared by said method as an absorbent. Also, it is an object of the present invention to provide a method for preparing porous organic-inorganic hybrid mater ial(s) through a quick and continuous-type manner by irradiating microwaves. In particular, with regard to the use as an absorbent, it is an object of the present invention to provide an absorbent having excellent absorption efficiency against water, or specific hazardous materials such as VOC, hazardous materials causing a sick house syndrome.
[38]
Technical Solution
[39] The first embodiment of the present invention relates to a water absorbent. In particular, the absorbent is characterized by using porous organic-inorganic hybrid material(s) containing environmental friendly iron as a metal component.
[40]
[41] The present invention provides an absorbent using porous organic-inorganic hybrid material(s) containing iron that can easily desorb at low temperature and that has a great difference between the absorption amount at low temperature and the absorption amount at high temperature. The absorbent according to the present invention has a surface area larger than 1,700 m /g and a pore volume larger than 0.8 mL/g, and contains both organic and inorganic compounds within the framework structure. Also, the porous organic-inorganic hybrid material(s) containing iron is characterized in that it is prepared by a reaction between an iron precursor and an organic ligand compound that can be coordinated with the iron precursor.
[42]
[43] In case the surface area and pore volume are smaller than the above values, it does not have a strong effect as a water absorbent. Also, it is better if the surface area and pore volume are as large as possible. However, as a range that can be substantially realized in the preparation method, the upper limit of the surface area is about 10,000 m /g, and the upper limit of the pore volume is about 10 mL/g. The porous organic- inorganic hybrid material(s) containing iron of the present invention has a surface area of 1,700-2,500 m2/g and a pore volume of 0.8-1.2 mL/g.
[44]
[45] Also, as for the conventional absorbent, the ratio of water absorption rate at 100 0C against the water absorption amount at room temperature is 0.5-1. Thus, there is a problem that 50 % and less of the water absorbed is desorbed at a temperature of 100
0C and below, and thus the desorption property is not good at low temperature. However, as for the absorbent of the present invention, it has a property that at least 80 %, more preferably at least 90 %, of the water absorbed is desorbed at a temperature of 100 0C and below. Further, after being dried at 60-80 0C for 10-30 minutes, the water absorption amount at a relative humidity of 60-80 % is 0.4-0.7 g/g of weight of the absorbent, and thus the water absorbent amount per weight of the absorbent is very high. Therefore, the water absorbent of the present invention has a very high water absorption amount. In addition, at a low temperature of 100 0C and below, the absorbent can easily desorb and has a faster desorption rate than the conventional absorbent, and thus is suitable to be used to adjust humidity.
[46]
[47] In the second embodiment of the present invention, the present invention provides a novel method for efficiently preparing porous organic-inorganic hybrid material(s). In particular, the present invention provides a method for preparing porous organic- inorganic hybrid material(s) having nano size particles wherein use of hydrofluoric acid has been eliminated in the hydrothermal synthesis. Also, said preparation method of the present invention is characterized by comprising a method of purifying in order to increase the surface area of the porous organic-inorganic hybrid material(s). Further, the present invention relates to a novel use characterized by using the porous organic- inorganic hybrid material(s) obtained by the novel preparation method as a water absorbent, an absorbent for removing specific hazardous materials such as VOC (volatile organic compounds), etc. Said specific hazardous materials comprise materials in vapor phase or particular phase such as formaldehyde, acetaldehyde, tar, nitrosoamines and polycyclicaromatic hydrocarbons, causing a sick house syndrome in addition to volatile organic compounds. Also, the present invention relates to a novel use characterized by using the porous organic-inorganic hybrid material(s) obtained by the novel preparation method as a water absorbent, an absorbent for removing specific hazardous materials in vapor phase or particular phase.
[48]
[49] Hereinafter, the present invention is explained in more detail.
[50] With regard to the first embodiment of the present invention, the porous organic- inorganic hybrid material(s) containing iron used as an absorbent according to the present invention is prepared by a method comprising following steps:
[51] (1) preparing a reaction solution by mixing an iron or iron salt as an iron precursor, an organic ligand, a solvent and a mixed-acid comprising nitric acid and hydrofluoric acid as a reaction accelerant; and
[52] (2) heating the reaction solution with electric heating or microwave-irradiation.
[53]
[54] As an organic compound which may be another component contained in a porous organic-inorganic hybrid material(s) and may act as a ligand, referred to as a linker, any organic compound capable of coordination bonding can be used. For example, functional groups that can coordinate can be -CO , -N, carboxylic acid group, anion group of carboxylic acid, amino group (-NH ), imino group (
>!
), amide group (-CONH ), sulfonic acid group (-SO H), anion group of sulfonic acid (-SO ), methanedithioic acid group (-CS H), anion group of methanedithioic acid (-CS ), pyridine group, pyrazine group, etc.
[55]
[56] In order to induce more stable organic-inorganic hybrid material(s), organic compounds having at least two sites for coordination, e.g., being bidentate or tridentate are advantageous. The organic compound may be a neutral organic compound such as bipyridine, pyrazine, etc., anionic organic compounds, e.g., anions of carbonic acid such as terephthalate, naphthalenedicarboxylate, benzenetricarboxylate, glutarate, succinate, etc., and cationic materials, if these have a site for coordination. As for the anions of carbonic acid, in addition to anions having aromatic rings such as terephthalate, any anions, e.g., linear carbonic acid anions such as formate, and anions having non- aromatic rings such as cyclohexyldicarbonate can be used.
[57]
[58] Also, in addition to an organic compound having a site for coordination, an organic compound which may be converted to be coordinated in reaction condition due to a potential site for coordination can be used as well. That is, even though organic acids such as terephthalic acid are used, the organic compound such as terephthalate may be bonded to a metal component, after reaction. Representative examples of the organic compounds which can be used include an organic acid or anion thereof selected from benzenedicarboxylic acid, naphthalenedicarboxylic acid, benzenetricarboxylic acid, naphthalenetricarboxylic acid, pyridinedicarboxylic acid, bipyridyldicarboxylic acid, formic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, hexanedioic acid, heptanedioic acid and cyclohexyldicarboxylic acid, pyrazine, bipyridine, etc. Further, one or more organic compounds can be mixed together to be used. It is preferable to use terephthalic acid or benzenetricarboxylic acid.
[59]
[60] The method for preparing the porous organic-inorganic hybrid material(s) containing iron, the absorbent according to the present invention, can be prepared by adding an iron precursor, an organic ligand, a solvent and a mixed-acid comprising hydrofluoric acid and nitric acid as a reaction promoter to the reactor and sealing it, and
heating the reactor to 100-250 0C while maintaining the reaction temperature using microwaves or electricity and maintaining the pressure to autogeneous pressure.
[61]
[62] As stated above, the method for preparing organic-inorganic hybrid material(s) containing iron according to the present invention is characterized by using acid, preferably, a mixed-acid comprising hydrofluoric acid and nitric acid. In particular, the iron-containing organic-inorganic hybrid material(s) of the present invention show a remarkable improvement in crystallinity and decrease in crystal size in comparison with the conventional synthetic methods which use only hydrofluoric acid. With the conventional preparation method using hydrofluoric acid, organic-inorganic hybrid material(s) containing iron having a surface area larger than 1,700 m /g and a pore volume larger than 0.8 mL/g cannot be prepared. Referring to the results of the examples and comparative examples, in case of using the conventional hydrofluoric acid, the BET surface area is 1,590 m /g and is remarkably lower than the BET surface area of 2,050 m /g using a mixed- acid. Also, the pore volume is 1.0 ml/g in case of using a mixed-acid, whereas the pore volume is 0.7 ml/g and lower in case of using hydrofluoric acid. Also, when a mixed-acid is used, although it has a very short reaction time (within 2 minutes when using microwaves) compared with the case of not using a mixed-acid, it has been confirmed to have an effect such that the crystallinity is improved and the yield is almost the same. However, it is difficult to prepare organic- inorganic hybrid material(s) having sufficient crystallinity even if an acid such as acetic acid, sulfuric acid, etc. as other acid, or salt such as ammonium fluoride and sodium chloride, etc. are used. In the preparation method of the present invention, the desired iron-containing organic-inorganic hybrid material(s) of the present invention can be prepared by using nitric acid and hydrofluoric acid in a molar ratio of 0.1-1:1-0.1 in a mixed- acid. If the molar ratio of nitric acid or hydrofluoric acid deviates from the above range, there are some disadvantages such that the yield is decreased and the reaction time elongated too much.
[63]
[64] In addition to a metal component and an organic compound, a suitable solvent is required for preparing porous organic-inorganic hybrid material(s). As said solvent, any substance among water, alcohols, ketones and hydrocarbons can be used, and two or more solvents can be mixed together to be used. Preferably, one or a mixture of at least two selected from water, alcohols having 1-10 carbon atoms such as methanol, ethanol, propanol, ketones having 2-10 carbon atoms such as acetone, methylethylketone, and hydrocarbons having 5-20 carbon atoms such as hexane, heptane, octane can be used. More preferably, water can be used.
[65]
[66] Said iron precursor can be mixed with an organic compound in a ratio of 1:0.1-10
(molar ratio). Said ratio can be properly adjusted depending on the kind of the metal component and organic compound. In the present invention, as an iron precursor, iron salt such as nitrogen iron, iron in the form of metal powder, etc. is used, and as an organic ligand, terephthalic acid or benzenetricarboxylic acid is more preferable.
[67]
[68] In the present invention, the reaction temperature for preparing porous organic- inorganic hybrid material(s) is not substantially limited. However, a temperature of at least 100 0C is suitable. A temperature of 100-250 0C is preferable, and a temperature of 150-220 0C is more preferable. If said reaction temperature is below 100 0C and thus too low, the reaction rate is slow and thus not efficient, and if the reaction temperature exceeds 250 0C and thus too high, materials having no pores can be easily obtained and the reaction rate becomes too fast so that impurities can be easily included. Also, the inner pressure of the reactor becomes higher, which makes the constitution of the reactor not economic. Although the reactor pressure is not substantially limited, it is convenient to synthesize the materials at autogeneous pressure of the reaction materials at reaction temperature. Also, the reaction may be performed at high pressure by adding inert gas such as nitrogen, helium. In case microwaves are irradiated as a heat source in said reaction, microwaves of a frequency of about 300 MHz - 300 GHz can be used for heating the reaction material. However, microwaves of a frequency of 2.45 GHz, 0.915 GHz, are generally used in industries.
[69]
[70] The method irradiating microwaves has a shorter reaction time, a relatively smaller particle size of porous organic-inorganic hybrid material(s), and large surface area value compared with the method using electric heating, and thus has more excellent properties as a water absorbent.
[71]
[72] Also, in order to be used as an absorbent in humidifiers or dehumidifiers, the absorption and desorption property within the first 10 minutes, more preferably the first 5 minutes, are important. That is, although the absorption amount is large, if its rate is too slow, the absorbent may not be suitable to be used for humidifiers and dehumidifiers. However, as for the absorbent prepared by the method of irradiating microwaves among the absorbent according to the present invention, the absorption rate is very high, and the desorption rate is excellent, and thus the absorbent has properties more suitable to be used for such use. That is, after being dried at 60-80 0C for 10-30 minutes and kept in a relative humidity of 60-80 % for 5 minutes, the water absorption amount was 0.35-0.45 g/g of weight of the absorbent, and thus the initial absorption rate is very high.
[73]
[74] In said preparation method, the reaction can be performed by the batch-type reactor and the continuous -type reactor. The batch-type reactor has a low productivity per hour, and thus is suitable for producing a small amount of a porous organic-inorganic hybrid material(s). The continuous -type reactor needs a large amount of investment cost, but is suitable for mass-production. As for the batch-type reactor, a reaction time of 1 minute ~ 8 hours is suitable. If the reaction time is too long, impurities can be easily included and the particles grow and thus it is difficult to make nano particles. If the reaction time is too short, the conversion rate of the reaction is low. As for the continuous -type reactor, a residence time of 1 minute ~ 1 hour is suitable. However, if the residence time is too long, the productivity is low and large particles are obtained, and if the residence time is too short, the conversion rate of the reaction is low. A residence time of 1 minute ~ 20 minutes is more suitable. In case of using a batch-type reactor, the reaction material may be stirred during the reaction, and a stirring rate of 100-1000 rpm is suitable. However, the reaction may be performed without the stirring process, which makes the constitution and operation of the reactor simple and easy for application.
[75]
[76] Since the reaction using microwaves is conducted in a very fast rate, it is preferable to enhance the uniformity and solubility of the reaction materials and to irradiate microwaves in a condition pre-treated to partly form crystal nuclei. If the reaction by microwaves is started in a condition that is not pre-treated, the reaction gets slow, or impurities can be easily included, or the uniformity of the particle size can get lower. However, the process itself gets more simple. Pre-treating can be performed by treating the reaction materials with supersonic waves or vigorously stirring. As for said pre- treating temperature, a temperature between room temperature and reaction temperature is preferable. However, it has a disadvantage that if the temperature is too low, the pre-treating effect is weak and if the pre-treating temperature is too high, impurities are easily generated and the pre-treating facility becomes complex. It is suitable that said pre-treating is conducted for 1 minute ~ 5 hours. If treated with supersonic waves, at least 1 minute is suitable, and if treated by stirring, at least 5 minutes is suitable. In case of performing the pre-treating step by stirring, it is preferable to stir the metal component and the organic compound in the presence of a solvent in 50-2,000 rpm for 5-600 minutes, and in case of performing the pre-treating step by irradiating supersonic waves, it is more preferable to irradiate supersonic waves of 15,000 Hz - 30 MHz for 1-600 minutes. If the pre-treating time is too short, the pre-treating effect is weak, and if the pre-treating time is too long, the pre-treating efficiency becomes low. Performing the pre-treating using supersonic waves is more
preferable in terms of pre-treating time and uniformity of the reaction material.
[77]
[78] The second embodiment of the present invention relates to a method for preparing porous organic-inorganic hybrid material(s) comprising the following steps:
[79] (1) preparing a reaction solution by mixing a metal precursor, an organic compound which may act as a ligand, an acid and a solvent;
[80] (2) heating the reaction solution to higher than or equal to 1000C with electric heating or microwave-irradiation; and
[81] (3) purifying the porous organic-inorganic hybrid material(s) obtained in the step
(2) by treatment with an inorganic salt or a solvent.
[82]
[83] In said preparation method, step (3) can be performed optionally when necessary.
[84]
[85] The porous organic-inorganic hybrid material(s) prepared by said preparation method according to the present invention can be obtained as nanoparticles, and the size of said nano particle is about 450 nm or below. Also, the porous organic-inorganic hybrid material(s) prepared by said preparation method according to the present invention can be in a form of powder, thin film or membrane.
[86]
[87] The porous organic-inorganic hybrid material(s) in a form of nanoparticles, thin film or membrane can be easily prepared by methods such as electric heating and irradiating microwaves after immersing the substrate to the mixed reaction solution.
[88]
[89] The preparation method of the porous organic-inorganic hybrid material(s) of the present invention prepares organic-inorganic hybrid material(s) having nano size particles wherein use of hydrofluoric acid has been eliminated in the hydrothermal synthesis for preparing nanoporous materials. Also, as a purifying method for increasing the surface area of the porous organic-inorganic hybrid material(s), the method is characterized by further comprising a step of purifying impurities within the pore of the organic-inorganic hybrid material(s) by treating them using inorganic salts such as ammonium chloride or potassium fluoride, etc. in addition to the solvent generally used.
[90]
[91] Also, the porous organic-inorganic hybrid material(s) has a novel use as an absorbent. In particular, the absorbent of the porous organic-inorganic hybrid material(s) according to the present invention can easily perform absorption and desorption at a temperature of 1000C and below, and the absorption amount per weight of the absorbent is high. Thus, the absorbent can be used as a water absorbent that can
be applied to humidifiers, dehumidifiers, and coolers/heaters. Further, the porous organic-inorganic hybrid material(s) of the present invention having a large surface area and uniform pore properties can be used as an absorbent having excellent absorption efficiency against specific hazardous materials.
[92]
[93] In the preparation method of the present invention, as a metal component, which is one of components contained in porous organic-inorganic hybrid material(s), any metal can be used. The representative metal components include Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Re, Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Hg, Mg, Ca, Sr, Ba, Sc, Y, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, Sb, Bi, etc. In particular, transition metals which easily form coordination compound are suitable. Among said transition metals, chromium, vanadium, iron, nickel, cobalt, copper, titanium and manganese, etc. are suitable, and chromium and iron are the most suitable one. In addition to transition metals, representative elements forming a coordination compound and metals such as lanthanide can also be used. Among elements, aluminum and silicon are suitable, and among lanthanide metals, cerium and lanthanum are suitable. As a metal source, metal itself, and any compound of metal can be used.
[94]
[95] In the second embodiment of the present invention, the organic compound which may be another component contained in the organic-inorganic hybrid material(s) and may act as a ligand, and the solvent used in the synthesis of the organic-inorganic hybrid material(s) are the same as those used in the first embodiment.
[96]
[97] In order to regulate the crystal growth rate of the nanoporous organic-inorganic hybrid material(s), an acid, in particular, a mixed-acid comprising hydrofluoric acid along with nitric acid, hydrochloric acid and hydrofluoric acid can be used.
[98]
[99] Meanwhile, in the process using hydrofluoric acid, there may be a limitation in using reactors other than the Teflon reactor. Until now, for the crystal growth rate of the nanoporous organic-inorganic hybrid material(s), it is well known that the nuclei formation rate is low, while the crystal growth rate is relatively high. Therefore, in reaction materials including hydrofluoric acid, the nuclei formation rate becomes relatively slow due to the strong bonding characteristics between metal ion and fluoride ion, and thus it may be difficult to obtain nanoporous materials having a small crystal size.
[100]
[101] Therefore, in another aspect of the present invention, the method for preparing porous organic-inorganic hybrid material(s) of the present invention is characterized by
using an inorganic acid except hydrofluoric acid for preparing porous organic- inorganic hybrid material(s), in order to solve the above problems caused by using hydrofluoric acid. Thereby, nanoporous organic-inorganic hybrid material(s) having a relatively small nano particle size can be prepared by said preparation method of the present invention without using hydrofluoric acid at all.
[102]
[103] Also, in order to remove the metal or organic ligand present as impurities within the pores of the porous organic-inorganic hybrid material(s) prepared by the second embodiment of the present invention, impurities were conventionally removed using a solvent. However, as for such case, there is a limitation in removing organic or inorganic impurities chelated within the pore. In comparison with the above, in the preparation method of the present invention, impurities within the pore of nanoporous organic-inorganic hybrid material(s) can be efficiently removed by treating porous organic-inorganic hybrid material(s) using an inorganic salt, in particular, comprising monovalent or divalent cation selected from the group consisting of NH+ 4 , alkali metal and alkali earth metal, and monovalent or divalent anion selected from the group consisting of halogen anion, carbonic acid ion (CO ), nitric acid ion and sulfuric acid ion. Accordingly, nanoporous organic-inorganic hybrid material(s) having large surface area can be obtained. At least one inorganic salt selected from the group consisting of a salt comprising Ca + or Mg + as divalent cation and F , I or Br as monovalent anion, a salt comprising monovalent cation and divalent anion, NH F, KF, KI and KBr can be used as said inorganic salt.
[104]
[105] In the present invention, it has been confirmed by measuring the surface area that the nitrogen adsorption amount of the nanoporous organic-inorganic hybrid material(s) after being treated with inorganic salt increases by 200 ml/g.
[106]
[107] In addition to the hydrothermal synthetic using the electric heating, hydrothermal synthesis in a batch-type manner or continuous -type manner with irradiating microwaves can be used. Also, the membrane or thin film of the organic-inorganic hybrid material(s) can be prepared by irradiating microwaves to heat after immersing the substrate to the mixed solution of the reaction materials from said step (1).
[108]
[109] According to the preparation method of the present invention, in particular, novel porous organic-inorganic hybrid material(s) represented by formula of Cr OH(H O) O[C 6 H 4 (CO 2 ) 2 ] 3 -nH 2 O (n~25) or formula of Fe 3 O(H2 O) 2 OH[C 6 H3 -(CO 2 ) 3 ] 2 -nH 2 O
(n~14.5) which do not contain fluorine can be obtained. [HO]
[111] Also, the porous organic-inorganic hybrid material(s) obtained by the preparation method of the present invention can be used as a catalyst for oxidation reaction or as an acid catalyst.
[112]
[113] In addition, the porous organic-inorganic hybrid material(s) prepared according to the preparation method of the present invention can be used as an absorbent having excellent absorption and desorption efficiency. In particular, in case of being used as a water absorbent, since desorption easily occurs at a low temperature of 1000C and below, a very excellent efficiency can be achieved in humidifiers, dehumidifiers, etc. by using such properties. Further, in case of using the porous organic-inorganic hybrid material(s) prepared according to the preparation method of the present invention as an absorbent of VOC, a material causing sick house syndrome, specific hazardous materials can be removed efficiently.
[114]
[115] In particular, in case the porous organic-inorganic hybrid material(s) obtained by the preparation method of the present invention is used as a low-temperature water absorbent, it can be confirmed that it has a low temperature desorption property of 1000C and below, preferably 50 ~ 1000C, and a very fast water absorption rate compared with the conventional organic-inorganic nanoporous material(s) containing HF.
[116]
Advantageous Effects
[117] As stated above, the porous organic-inorganic hybrid material(s) containing iron prepared according to the present invention has a large absorption amount of water and has an excellent desorption amount property at low temperature. Thus, it can be used in dehumidifiers, humidifiers, heaters or coolers as an absorbent. In particular, it has an advantage that the desorption temperature is very low, and thus the cost for operating such equipments can be remarkably reduced.
[118]
[119] Also, in another aspect, although the porous organic-inorganic hybrid material(s) prepared according to the novel preparation method of the present invention do not use hydrofluoric acid during the hydrothermal synthesis, they are nanoporous materials having high crystallinity. In particular, their surface area can be increased by purifying them by removing the impurities within the pore of the nanoporous organic-inorganic hybrid material(s) by treating them with an inorganic salt such as ammonium chloride or potassium fluoride, etc. In addition, the porous organic-inorganic hybrid material(s) prepared according to the preparation method of the present invention can be used as
an absorbent having excellent absorption and desorption efficiency. In particular, in case of being used as a water absorbent, desorption easily occurs at a low temperature of 1000C and below. Thus, using such properties, a very excellent efficiency can be achieved in humidifiers, dehumidifiers, etc. Further, in case of using the porous organic-inorganic hybrid material(s) prepared according to the preparation method of the present invention as an absorbent of VOC, a material causing sick house syndrome, specific hazardous materials can be removed efficiently.
[120]
Brief Description of the Drawings
[121] Fig. 1 is an X-ray diffraction pattern of iron benzenetricarboxylate organic- inorganic absorbent obtained by Example 1.
[122]
[123] Fig. 2 is an isotherm result of nitrogen adsorption of iron benzenetricarboxylate organic-inorganic absorbent obtained by Example 1.
[124]
[125] Fig. 3 is a graph showing the water absorption property of the absorbent using iron benzenetricarboxylate of Examples 1 & 2 and zeolite Y of Comparative Example 1 : it is the result of performing desorption of water absorbent at 70 0C (Examples 1 & 2) or 200 0C (Comparative Example 1), and absorption at a relative humidity of 68%.
[126]
[127] Fig. 4 is a graph showing the water desorption experiment results regarding the absorbent of Example 1 and Comparative Example 1 : Example 1 is the water desorption result at 70 0C and Comparative Example 1 is the water desorption result at 200 0C.
[128]
[129] Fig. 5 is an X-ray diffraction pattern of the chromiumterephthalate, which is a porous organic-inorganic hybrid material(s) prepared in accordance with the preparation method of Example 3 of the present invention.
[130]
[131] Fig. 6 is the result of X-ray diffraction patterns before and after purifying the chromiumterephthalate which is the porous organic-inorganic hybrid material(s) prepared in accordance with the purifying method of Example 3 of the present invention, wherein (a) is the pattern before purifying, and (b) is the pattern after purifying.
[132]
[133] Fig. 7 is an isotherm result of nitrogen adsorption of the chromiumterephthalate which is the porous organic-inorganic hybrid material(s) obtained by Example 4 of the
present invention.
[134]
[135] Fig. 8 is electron microscope images of iron benzenetricarboxylate organic- inorganic hybrid material(s), which is the porous organic-inorganic hybrid material(s) obtained by Example 5 and Comparative Example 4 of the present invention.
[136]
[137] Fig. 9 is the result of the water absorption property of the porous organic-inorganic hybrid material(s) containing iron obtained by Examples 5 & 6 and Comparative Example 4 of the present invention.
[138]
Mode for the Invention
[139] Example 1: Preparation of porous organic-inorganic hybrid material(s)
(Fe-BTC) by microwaves irradiation
[140] After adding metallic iron 1 mmol, IM HNO 60 ml, 5M HF (aqueous solution) 40 ml and 1,3,5-benzenetricarboxylic acid (BTCA) 7 mmol to a Teflon reactor, distilled water was added. The final molar ratio of the reaction material was Fe:HF:HNO 3
:BTCA:H O = 1:2:0.6:0.7:278. The mixed reaction material was stirred in 500 rpm for 20 minutes at room temperature to make the reaction material as homogeneous as possible. After mounting the Teflon reactor containing said pre-treated reaction material on a microwaves reactor (CEM company, model Mars-5) and then raising the temperature to 2000C by irradiating microwaves (2.54 GHz), crystallization was performed by maintaining the reaction material at 200 0C for 2 minutes. Then, the reaction material was cooled to room temperature, centrifuged, washed with distilled water and dried to obtain a porous organic-inorganic hybrid material(s) (Fe-BTC). The X-ray diffraction pattern of the solid phase porous organic-inorganic hybrid material(s) obtained as above is as shown in Fig. 1. As a result of elementary analysis, it showed a molar ratio of Fe:C:F=l:6.5:0.32, and as a result of a nitrogen adsorption experiment, it had a BET surface area of 2,050 m /g and a pore volume of 1.0 ml/g. And it formed as porous particles with yield of 86 % (Fig. 2).
[141]
[142] The above results show that the material has a crystal structure similar to the Cr-
MIL-100 structure, which has been previously published [Bulletin of Korean Chemical Society vol.26, p.88O (2005)].
[143]
[144] Example 2: Preparation of porous organic-inorganic hybrid material(s)
(Fe-BTC) by electric heating
[145] A porous organic-inorganic hybrid material(s) was prepared by the same method as
Example 1, except that the organic-inorganic hybrid material(s) was prepared by heating for 144 hours by electric heating using the conventional Convection oven instead of irradiating microwaves as a heat source. As a result of XRD analysis, it can be confirmed that relative intensity of the peak was different; however, a diffusion pattern was shown in the same position as Example 1 as for the crystal structure of the organic-inorganic hybrid material(s) prepared as above. As a result of nitrogen absorption experiment, it showed a BET surface area of 1,820 m /g and a pore volume of 0.9 ml/g.
[146]
[147] Comparative Example 1: Zeolite water absorbent
[148] Zeolite Y (Aldrich company, Si/Al = 5.6, surface area = 827 m /g, pore volume =
0.35 ml/g) used as a commercial water absorbent was prepared.
[149]
[150] Comparative Example 2: Preparation of porous organic-inorganic hybrid material(s) (Fe-BTC) using a single acid
[151] A porous organic-inorganic hybrid material(s) was prepared by the same method as
Example 1, except that the hybrid material was prepared using a single acid which is not a nitric acid. After adding metallic iron 1 mmol, 5M HF (aqueous solution) 40ml and 1,3,5-benzenetricarboxylic acid (BTCA) 7 mmol to a Teflon reactor, distilled water was added. The final molar ratio of the reaction material was Fe:HF:BTCA:H 2
0=1:2:0.6:278. The temperature of microwave irradiation to the organic-inorganic hybrid material(s) was 200 0C, and the reaction was carried out for an hour. The yield of the solid phase porous organic-inorganic hybrid material(s) obtained was 82 %. The X-ray diffraction shape of the porous organic-inorganic hybrid material(s) was very similar to the results as in Example 1, but its overall peak strength is low. Also, as a result of a nitrogen adsorption experiment, it showed a BET surface area of 1,590 m /g and a pore volume of 0.7 ml/g.
[152]
[153] Experimental Example 1: Water absorption test
[154] After vacuum drying the absorbent obtained from Examples 1 & 2 at 70 0C for 30 minutes, a water absorption test was performed by the gravimetric method (Fig. 3). Even at a relative humidity of 68 %, the water absorption amount per weight of the absorbent was 0.67 g/g Example 1, and 0.59g/g in Example 2.
[155]
[156] Compared with zeolite Y used as the commercial water absorbent of Comparative
Example 1, as a result of performing the water absorption test in the same manner after vacuum drying zeolite Y at 200 0C for 30 minutes, the water absorption amount was 0.35 g/g (Fig. 3). That is, although the desorption temperature of the absorbent of the
example was 70 0C, the absorbent of the present invention showed a water absorption amount that is at least 1.6 times larger.
[157]
[158] Also, the absorbent of Example 1 prepared by using microwaves showed an absorption amount of 0.4 g/g after the first 5 minutes, and 0.56 g/g after 10 minutes, whereas the absorbent of Comparative Example 1 showed an absorption amount of 0.25 g/g after 5 minutes, and 0.28 g/g after 10 minutes. Thus, it can be known that the absorbent according to Example 1 of the present invention has a very high initial absorption rate.
[159]
[160] Experimental Example 2: Water desorption test
[161] After the absorbent prepared in Example 1 and sodium zeolite Y (NaY) were put at the upper layer of the in a desiccator carrying the saturated solution of ammonium chloride and maintained for 3 days to sufficiently absorb water, the desorption amount was analyzed by the gravimetric method. As for the desorption condition, the weight reduction of the absorbent was measured while flowing out 300 ml/min of nitrogen. The desorption temperature of the absorbent of Example 1 was 70 0C, and the desorption temperature of sodium zeolite Y (NaY) of Comparative Example 1 was 200 0C.
[162]
[163] Fig. 4 is a graph illustrating the result of weight reduction according to the progress of time by having the total weight of the absorbent absorbing water as 100 %. The fact that the weight reduction rate does not decrease any more means that all of the water that can be desorbed has been desorbed. Referring to the result of Example 1, after 10 minutes, it showed a weight reduction of about 40 % by weight. As for Comparative Example 1, it showed a weight reduction of about 25 % by weight. As for Example 1, the water absorption amount that can be desorbed per weight of the absorbent was 40/60 = 0.67 g/g, and as for Comparative Example 1, the water absorption amount that can be desorbed per weight of the absorbent was 25/75 = 0.33 g/g. Therefore, it can be known that the absolute water absorption amount of the absorbent of Example 1 is at least 2 times faster than that of the absorbent of Comparative Example 1. Also, the desorption rate of the first 5 minutes is higher in the absorbent of Example 1 than the absorbent of Comparative Example 1.
[164]
[165] From the above results, it can be known that the absorbent according to the present invention can easily desorb water at a temperature of 100 0C, and that it has a high water absorption amount per unit weight. Using such properties, the absorbent is applied to humidifiers and dehumidifiers and is expected to present an excellent
efficiency in adjusting humidity. [166] [167] Example 3 (Cr-BDC-I)
[168] After adding Cr(NO ) -9H O, and 1,4-benzenedicarboxylic acid (BDCA) to a
Teflon reactor, distilled water was added so that the final molar ratio of the reaction material was CnHNO :BDCA:H 0=1:0.1:1:272. Basically, if Cr(NO ) dissolves in water, it is hydrated to become a strong acid. Thus, it has the same effect as adding HNO . After putting the Teflon reactor containing said reaction material in an electric oven and reacting it for 11 hours at 210 0C, it was cooled to room temperature, centrifuged, washed with distilled water and dried to obtain chromiumterephthalate (Cr-BDC) as a porous organic-inorganic hybrid material(s). The result of the X-ray diffraction analysis of the thus prepared Cr-BDC showed characteristic diffraction peaks of 2Θ values at about 3.3, 5.2, 5.9, 8.5 and 9.1, and it can be known that the chromiumterephthalate having cubic crystallinity was obtained (Fig. 5). It has been confirmed that the XRD pattern of the chromiumterephthalate crystal obtained from the present example was consistent with the values published in prior art [Science 23, 2040, 2005]. Thus, it can be shown that the porous organic-inorganic hybrid material(s) can be obtained very efficiently by an environmental friendly process that does not use hydrofluoric acid (HF) in the reaction materials. As a result of ICP analysis, it can be shown that the chromiumterephthalate, which is a porous organic- inorganic hybrid material(s) obtained, does not contain F, and thus its structure is the same as MIL-101 but it does not include F in its structure, thus being materials that can be re rpresented by J formula of Cr 3 OH(H 2 O) 20[C 6 H 4 (CO 2 ) 2 ] 3 -nH 2 O (n~25).
[169]
[170] Example 4 (Cr-BDC-2)
[171] Organic-inorganic hybrid material(s) with improved surface area were prepared by removing impurities such as 1,4-benzenedicarboxylic acid and chromium oxide, etc. which does not bind within the crystalline structure present in pores of the porous materials by putting the porous organic-inorganic hybrid material(s) 1 g prepared in Example 3 in 50 ml of IM NH F and stirring it at 70 0C. From the X-ray diffraction
4 pattern (Fig. 6), it can be confirmed that its crystallinity was maintained without being damaged after treating with ammonium fluoride. Also, from the result of measuring the nitrogen adsorption of the porous organic-inorganic hybrid material(s) before and after treating with ammonium fluoride, it can be shown that organic-inorganic hybrid material(s) having features such that the surface area increases by 700 m /g (before treating with ammonium fluoride, 3,373 m /g → after treatment, 4,074 m Ig) due to the ammonium fluoride treatment, and the adsorption amount at P/Po=0.5 increases by 200 ml/g (before treating with ammonium fluoride, 1,050 ml/g → after treatment, 1,250
ml/g) can be obtained (Fig. 7). [172] [173] Example 5: Preparation of porous organic-inorganic hybrid material(s)
(Fe-BTC-I) by microwaves irradiation
[174] After adding metallic iron 1 mmol, IM HNO 60 ml and 1,3,5-benzenetricarboxylic acid (BTCA) 7 mmol to a Teflon reactor, distilled water was added. The final molar ratio of the reaction material was Fe:HNO :BTCA:H 0=1:0.6:0.7:278. The reaction
3 2 material was stirred in 500 rpm for 20 minutes at room temperature, to make reaction material homogeneous. After mounting the Teflon reactor containing said pre-treated reaction material on a microwaves reactor (CEM company, model Mars-5) and raising the temperature to 2000C by irradiating microwaves (2.54 GHz), crystallization was performed by maintaining the reaction mixture at 200 0C for 2 minutes. Then, the reaction mixture was cooled to room temperature, centrifuged, washed with distilled water and dried to obtain the porous organic-inorganic hybrid material(s) (Fe-BTC). It is shown that the shape of the X-ray diffraction pattern was similar to that of the Cr- MIL-100 structure which is the crystal structure previously published [Bulletin of Korean Chemical Society vol.26, p.880 (2005)]. As a result of ICP analysis, it can be known that the chromiumterephthalate, which is a porous organic-inorganic hybrid material(s) obtained, does not contain F, and thus its structure is the same as MIL-100, but it does not include F within its structure, and it is a material that can be represented by J formula of Fe 3 O(H 2 O) 2 OH[C 6 H 3 -(CO 2 ) 3 ] 2 -nH 2 O (n~14.5). As a result of the nitrog &en adsorption test, it has been confirmed that the surface area of the porous organic- inorganic hybrid material(s) (Fe-BTC) was at least 1,700 m /g. As a result of the analysis of electron microscope, it can be known that the particle size became very small to 200-500 nm and below (Fig.8a).
[175]
[176] Example 6: Preparation of porous organic-inorganic hybrid material(s)
(Fe-BTC-2) by electric heating
[177] A porous organic-inorganic hybrid material(s) was prepared in the same method as
Example 3 except that the organic-inorganic hybrid material(s) was prepared by heating for 6 hours by an electric heating using the conventional electric heating instead of irradiating microwaves as a heat source. As a result of XRD analysis, it can be confirmed that relative intensity of the peak was different; however, a diffraction pattern was shown in the same position as Example 3 as for the crystal structure of the organic-inorganic hybrid material(s) prepared as above. As a result of analysis using an electron microscope, a relatively large crystal whose particle size is 1 μm was obtained.
[178]
[179] Example 7 (Cr-BDC-3)
[180] An organic-inorganic hybrid material(s) was prepared in the same method as
Example 3 except that heating by microwaves irradiation was used instead of the electric heating in Example 3. However, the organic-inorganic hybrid material(s) was prepared by using microwaves reaction device of 2.5 GHz and maintaining the reaction temperature at 210 0C for 40 minutes. The X-ray diffraction pattern analysis showed that this material has the same structure as in Example 3.
[181]
[ 182] Example 8 (Fe-BDC-3)
[183] An organic-inorganic hybrid material(s) was prepared in the same manner as in
Example 3 except that Fe was used instead of Cr(NO ) -9H O. Also, pure porous organic-inorganic hybrid material(s) was prepared using the post-treating step of Example 4. It can be known from the X-ray diffraction pattern that the material having the same structure as in Example 3 was obtained.
[184]
[185] Example 9 (V-BDC-I)
[186] An organic-inorganic hybrid material(s) was prepared in the same manner as in the post-treating step of Examples 3 & 4 except that VCl was used instead of Cr(NO ) •9H O as in Example 8. The X-ray diffraction pattern shows that the material having the same structure as in Example 3 was obtained. The electron microscope photograph shows that the organic-inorganic hybrid material(s) having uniform particle size of 50-80 nm was obtained.
[187]
[188] Example 10
[189] After vacuum drying 0.1 g of the organic-inorganic hybrid material, Fe-BTC respectively obtained from Examples 5 & 6 and Comparative Example 4 at 150 0C for 30 minutes, the absorption test of water was performed by the gravimetric method (Fig. 9). At a relative humidity of 60 %, the water absorption amount per weight of the absorbent within the first 5 minutes was measured to be 0.36 g/g in Example 5, and 0.34 g/g in Example 6. This shows a result improved respectively by 24 %, 17 % than the absorption amount of Comparative Example 4, 0.29 g/g. In particular, it has been confirmed that the water absorption rate of the entire region from the initial stage of absorption to 5 minutes is very high. As such, in case of using the porous organic- inorganic hybrid material(s) according to the present invention as a low-temperature water absorbent, it can be known that the absorbent can easily desorb at a temperature of 100 0C and below, and using such property, it can achieve a very excellent efficiency in humidifiers, dehumidifiers, etc.
[190]
[191] Example 11
[192] As a result of performing an absorption test for an hour by adding benzene 1 g, which is the volatile organic compound, to the porous organic-inorganic hybrid material(s) Cr-BDC 1 g obtained by the method of Example 3, it has been confirmed that 0.73 g benzene is removed by absorption. It has been confirmed that such value is an absorption amount that is 3.5 times larger than 0.19 g benzene, which is the absorption amount of the same amount of active carbon of Darco (surface area 1,600 m
2/g).
[193]
[194] Comparative Example 3 (Cr-BDC-4)
[195] A nanoporous organic-inorganic hybrid material(s) was prepared using hydrofluoric acid for preparing a reaction mixture in the preparation method as in Example 3. The final molar ratio of the reaction mixture was Cr:HF:BDCA:H 2 O=I : 1 : 1 :272. A result of analyzing the surface area of the nanoporous organic-inorganic hybrid material(s) prepared as above shows that the organic-inorganic hybrid material(s) has adsorption amount of 1044 ml/g and BET surface area of 3,439 m2/g at P/Po=0.5.
[196]
[197] Comparative Example 4 (Fe-BTC)
[198] A nanoporous organic-inorganic hybrid material(s) was prepared using hydrofluoric acid for preparing a reaction mixture in the preparation method as in Example 5. The final molar ratio of the reaction mixture was Fe:HF:HNO :BTCA:H
3 2
0=1:1:0.6:0.7:278. As a result of X-ray diffraction analysis of the organic-inorganic hybrid material(s) prepared as above, it can be known that the material having very large crystal size (1-5 μm) was obtained instead of a organic-inorganic hybrid material(s) having the same crystallinity as in Example 5 (Fig. 8b).
[199]
[200] From the results of the examples and comparative examples above, in comparison with the method using hydrofluoric acid, it has been confirmed that nanoporous organic-inorganic hybrid material(s) having the same crystallinity were prepared by the preparation method of the present invention that does not use hydrofluoric acid. In particular, it has been confirmed that the surface area increases by at least 10 % when treated with inorganic salt such as ammonium salt and potassium fluoride, etc. Also, it has been confirmed that the nanoporous organic-inorganic hybrid material(s) prepared according to the preparation method of the present invention have very high activity as a catalyst. In addition, the porous organic-inorganic hybrid material(s) prepared according to the preparation method of the present invention can be used as an absorbent having excellent absorption and desorption efficiency. In particular, when used as a water absorbent, since desorption occurs easily at a low temperature of 100
0C and below, a very excellent efficiency as a humidifier, dehumidifier, etc. can be achieved using such properties. Further, in case of using the porous organic-inorganic hybrid material(s) prepared according to the preparation method of the present invention as an absorbent of specific hazardous materials such as VOC, a material causing sick house syndrome, the specific hazardous materials in vapor phase and particulate phase can be removed efficiently.
Claims
(1) preparing a reaction solution by mixing an iron or iron salt as an iron precursor, an organic ligand, a solvent and a mixed-acid comprising nitric acid and hydrofluoric acid as a reaction accelerant; and
(2) heating the reaction solution with electric heating or microwave-irradiation. [2] The water absorbent of Claim 1, wherein an amount of the water absorption in the porous organic-inorganic hybrid material(s) containing iron under the relative humidity of 60 ~ 80% after drying at 60 ~ 8O0C for 10 ~ 30 min, is 0.4 ~ 0.7 g per gram of the porous organic-inorganic hybrid material(s).
[3] The water absorbent of Claim 1, wherein the reaction solution is heated at the temperature of 100 ~ 25O0C.
[4] The water absorbent of Claim 3, heating the reaction solution is conducted by microwave-irradiation.
[5] The water absorbent of Claim 3, wherein a batch-type reactor or a continuous- type reactor is used for the preparation.
[6] The water absorbent of Claim 1, wherein the method further comprises the step of pre-treating the reaction solution after step (1) by stirring in 50 ~ 2,000 rpm for 5 ~ 600 min or by irradiating with supersonic waves of 15,000 Hz ~ 30 MHz for 1 ~ 600 min to form crystal nuclei.
[7] An absorbent comprising porous organic-inorganic hybrid material(s) prepared by following steps:
(1) preparing a reaction solution by mixing a metal precursor, an organic compound which may act as a ligand, an acid and a solvent;
(2) heating the reaction solution to higher than or equal to 1000C with electric heating or microwave-irradiation; and
(3) purifying the porous organic-inorganic hybrid material(s) obtained in the step (2) by treatment with an inorganic salt or a solvent.
[8] The absorbent of Claim 7, wherein the acid is an inorganic acid except for hydrofluoric acid.
[9] The absorbent of Claim 7 or 8, wherein the inorganic salt used in the step (3) comprises a monovalent or divalent cation selected from the group consisting of
NH+ , alkali metals and alkali earth metals, and a monovalent or divalent anion selected from the group consisting of halogen anions, carbonate anion (CO ), nitrate ion and sulfate ion, and impurities in the obtained porous organic- inorganic hybrid material(s) are purified by treatment with said inorganic salt.
[10] The absorbent of Claim 7 or 8, wherein the metal precursor is at least one metal or compound thereof selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Re, Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Hg, Mg, Ca, Sr, Ba, Sc, Y, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, Sb and Bi.
[11] The absorbent of Claim 10, wherein the metal precursor is at least one metal or compound thereof selected from the group consisting of Al, Fe, V, Mn, Mg and Cr.
[12] The absorbent of Claim 7 or 8, wherein the organic compound which may act as a ligand is a compound containing at least one functional group selected from the group consisting of carboxylic acid group, anion group of carboxylic acid, amino group (-NH ), imino group (
>!
), amide group, sulfonic acid group (-SO H), anion group of sulfonic acid (-SO ), methanedithioic acid group (-CS H), anion group of methanedithioic acid (-CS ), pyridine group and pyrazine group, or a mixture thereof.
[13] The absorbent of Claim 12, wherein the compound containing anion group of carboxylic acid is derived from a compound selected from the group consisting of benzenedicarboxylic acid, naphthalenedicarboxylic acid, benzenetricarboxylic acid, naphthalenetricarboxylic acid, pyridinedicarboxylic acid, bipyridyldicarboxylic acid, formic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, hexanedioic acid, heptanedioic acid and cyclohexyldicarboxylic acid.
[14] The absorbent of Claim 7 or 8, wherein the porous organic-inorganic hybrid material(s) are chromiumterephthalate, ironterephthalate, aluminumterephthalate or vanadiumterephthalate.
[15] The absorbent of Claim 7 or 8, wherein the porous organic-inorganic hybrid material(s) is Fe-BTC (benzenetricarboxylate) or Cr-BDC (benzenedicarboxylate) .
[16] The absorbent of Claim 7 or 8, wherein the porous organic-inorganic hybrid material(s) are prepared in a form of nanoparticles.
[17] The absorbent of Claim 7 or 8, wherein the porous organic-inorganic hybrid material(s) are prepared in a form of thin film or membrane.
[18] The absorbent of Claim 7 or 8, wherein the porous organic-inorganic hybrid
material(s) do not contain fluorine and are represented by formula of Cr OH(H O) 20[C 6 H 4 (CO 2 ) 2 ] 3 -nH 2 O (n~25).
[19] The absorbent of Claim 7 or 8, wherein the porous organic-inorganic hybrid material(s) do not contain fluorine and are represented by formula of Fe 0(H O) OH[C 6 H 3 -(CO 2 ) 3 ] 2 -nH 2 O (n~14.5).
[20] A water absorbent wherein water is absorbed by using the absorbent according to
Claim 7 or 8. [21] The water absorbent of Claim 20, used for water absorption in a dehumidifier, a humidifier or a refrigerating machine. [22] The water absorbent of Claim 20, used for water absorption at the low temperature of 1000C or less. [23] The absorbent of Claim 7 or 8, used for absorbing specific hazardous materials in vapor phase or particulate phase. [24] The absorbent of Claim 7 or 8, used for absorbing volatile organic compounds in vapor phase or particulate phase. [25] The absorbent of Claim 7 or 8, used for absorbing one or more materials in vapor phase or particulate phase selected from the group consisting of formaldehyde, acetaldehyde, tar, nitrosoamines and polycyclicaromatic hydrocarbons, causing a sick house syndrome.
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| EP07851443.7A EP2101912B1 (en) | 2006-12-13 | 2007-12-12 | Porous organic-inorganic hybrid materials containing iron and an absorbent comprising the same |
| US12/484,090 US8168813B2 (en) | 2006-12-13 | 2009-06-12 | Porous organic-inorganic hybrid materials and adsorbent comprising the same |
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| KR1020060127343A KR100803964B1 (en) | 2006-12-13 | 2006-12-13 | A synthesis method of fe containing porous organic inorganic hybrid materials and water adsorbent using the same |
| KR10-2007-0075205 | 2007-07-26 | ||
| KR20070075205 | 2007-07-26 | ||
| KR10-2007-0077335 | 2007-08-01 | ||
| KR1020070077335A KR100890347B1 (en) | 2007-07-26 | 2007-08-01 | Absorbent Comprising Porous Organic-Inorganic Hybrid Materials |
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Also Published As
| Publication number | Publication date |
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| EP2101912A4 (en) | 2013-04-17 |
| JP2010512991A (en) | 2010-04-30 |
| EP2101912B1 (en) | 2017-06-28 |
| JP5453101B2 (en) | 2014-03-26 |
| EP2101912A1 (en) | 2009-09-23 |
| US20090263621A1 (en) | 2009-10-22 |
| US8168813B2 (en) | 2012-05-01 |
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