JP3944152B2 - 水質汚染有機物質の除去方法 - Google Patents
水質汚染有機物質の除去方法 Download PDFInfo
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- JP3944152B2 JP3944152B2 JP2003375324A JP2003375324A JP3944152B2 JP 3944152 B2 JP3944152 B2 JP 3944152B2 JP 2003375324 A JP2003375324 A JP 2003375324A JP 2003375324 A JP2003375324 A JP 2003375324A JP 3944152 B2 JP3944152 B2 JP 3944152B2
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- titanium oxide
- water
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- titanium
- aqueous solution
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- 239000000126 substance Substances 0.000 title claims description 38
- 238000000034 method Methods 0.000 title claims description 25
- 239000003403 water pollutant Substances 0.000 title description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 150
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 106
- 239000002243 precursor Substances 0.000 claims description 60
- 239000013078 crystal Substances 0.000 claims description 46
- 230000001699 photocatalysis Effects 0.000 claims description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 39
- 239000007864 aqueous solution Substances 0.000 claims description 36
- 229910052719 titanium Inorganic materials 0.000 claims description 19
- 239000010936 titanium Substances 0.000 claims description 19
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 17
- 230000002378 acidificating effect Effects 0.000 claims description 16
- 238000010304 firing Methods 0.000 claims description 14
- 239000011941 photocatalyst Substances 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 8
- 238000004090 dissolution Methods 0.000 claims description 7
- 238000001556 precipitation Methods 0.000 claims description 6
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 5
- 238000006864 oxidative decomposition reaction Methods 0.000 claims description 5
- 239000006059 cover glass Substances 0.000 claims description 2
- 238000003911 water pollution Methods 0.000 claims 4
- 244000005700 microbiome Species 0.000 claims 1
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 27
- 239000000243 solution Substances 0.000 description 15
- 238000006243 chemical reaction Methods 0.000 description 12
- 239000000843 powder Substances 0.000 description 11
- 241000195493 Cryptophyta Species 0.000 description 10
- 238000000746 purification Methods 0.000 description 9
- 238000004065 wastewater treatment Methods 0.000 description 9
- 230000001954 sterilising effect Effects 0.000 description 8
- 238000004659 sterilization and disinfection Methods 0.000 description 8
- 238000000354 decomposition reaction Methods 0.000 description 7
- 239000002552 dosage form Substances 0.000 description 7
- 239000007791 liquid phase Substances 0.000 description 7
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- -1 and in particular Chemical compound 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- VXUYXOFXAQZZMF-UHFFFAOYSA-N titanium(IV) isopropoxide Chemical compound CC(C)O[Ti](OC(C)C)(OC(C)C)OC(C)C VXUYXOFXAQZZMF-UHFFFAOYSA-N 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000012298 atmosphere Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 3
- 229910052753 mercury Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- LLZRNZOLAXHGLL-UHFFFAOYSA-J titanic acid Chemical compound O[Ti](O)(O)O LLZRNZOLAXHGLL-UHFFFAOYSA-J 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- QNVRIHYSUZMSGM-UHFFFAOYSA-N hexan-2-ol Chemical compound CCCCC(C)O QNVRIHYSUZMSGM-UHFFFAOYSA-N 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- DCKVFVYPWDKYDN-UHFFFAOYSA-L oxygen(2-);titanium(4+);sulfate Chemical compound [O-2].[Ti+4].[O-]S([O-])(=O)=O DCKVFVYPWDKYDN-UHFFFAOYSA-L 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- 230000036962 time dependent Effects 0.000 description 2
- 229910000349 titanium oxysulfate Inorganic materials 0.000 description 2
- 229910000348 titanium sulfate Inorganic materials 0.000 description 2
- UBZYKBZMAMTNKW-UHFFFAOYSA-J titanium tetrabromide Chemical compound Br[Ti](Br)(Br)Br UBZYKBZMAMTNKW-UHFFFAOYSA-J 0.000 description 2
- XROWMBWRMNHXMF-UHFFFAOYSA-J titanium tetrafluoride Chemical compound [F-].[F-].[F-].[F-].[Ti+4] XROWMBWRMNHXMF-UHFFFAOYSA-J 0.000 description 2
- YONPGGFAJWQGJC-UHFFFAOYSA-K titanium(iii) chloride Chemical compound Cl[Ti](Cl)Cl YONPGGFAJWQGJC-UHFFFAOYSA-K 0.000 description 2
- NLPMQGKZYAYAFE-UHFFFAOYSA-K titanium(iii) fluoride Chemical compound F[Ti](F)F NLPMQGKZYAYAFE-UHFFFAOYSA-K 0.000 description 2
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- QNVRIHYSUZMSGM-LURJTMIESA-N 2-Hexanol Natural products CCCC[C@H](C)O QNVRIHYSUZMSGM-LURJTMIESA-N 0.000 description 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical class S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 239000003125 aqueous solvent Substances 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001642 boronic acid derivatives Chemical class 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- YHWCPXVTRSHPNY-UHFFFAOYSA-N butan-1-olate;titanium(4+) Chemical compound [Ti+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] YHWCPXVTRSHPNY-UHFFFAOYSA-N 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001877 deodorizing effect Effects 0.000 description 1
- 150000002013 dioxins Chemical class 0.000 description 1
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- ICIWUVCWSCSTAQ-UHFFFAOYSA-N iodic acid Chemical class OI(=O)=O ICIWUVCWSCSTAQ-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- ZEIWWVGGEOHESL-UHFFFAOYSA-N methanol;titanium Chemical compound [Ti].OC.OC.OC.OC ZEIWWVGGEOHESL-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- QQZOPKMRPOGIEB-UHFFFAOYSA-N n-butyl methyl ketone Natural products CCCCC(C)=O QQZOPKMRPOGIEB-UHFFFAOYSA-N 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 235000019645 odor Nutrition 0.000 description 1
- 150000002896 organic halogen compounds Chemical class 0.000 description 1
- 150000002903 organophosphorus compounds Chemical class 0.000 description 1
- 150000003891 oxalate salts Chemical class 0.000 description 1
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical class [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 description 1
- CEOCDNVZRAIOQZ-UHFFFAOYSA-N pentachlorobenzene Chemical compound ClC1=CC(Cl)=C(Cl)C(Cl)=C1Cl CEOCDNVZRAIOQZ-UHFFFAOYSA-N 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
- 238000013033 photocatalytic degradation reaction Methods 0.000 description 1
- 238000002459 porosimetry Methods 0.000 description 1
- 239000011736 potassium bicarbonate Substances 0.000 description 1
- 229910000028 potassium bicarbonate Inorganic materials 0.000 description 1
- 235000015497 potassium bicarbonate Nutrition 0.000 description 1
- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- 235000011181 potassium carbonates Nutrition 0.000 description 1
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 description 1
- 229940086066 potassium hydrogencarbonate Drugs 0.000 description 1
- 235000011118 potassium hydroxide Nutrition 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- HKJYVRJHDIPMQB-UHFFFAOYSA-N propan-1-olate;titanium(4+) Chemical compound CCCO[Ti](OCCC)(OCCC)OCCC HKJYVRJHDIPMQB-UHFFFAOYSA-N 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- GROMGGTZECPEKN-UHFFFAOYSA-N sodium metatitanate Chemical compound [Na+].[Na+].[O-][Ti](=O)O[Ti](=O)O[Ti]([O-])=O GROMGGTZECPEKN-UHFFFAOYSA-N 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 150000003608 titanium Chemical class 0.000 description 1
- JMXKSZRRTHPKDL-UHFFFAOYSA-N titanium ethoxide Chemical compound [Ti+4].CC[O-].CC[O-].CC[O-].CC[O-] JMXKSZRRTHPKDL-UHFFFAOYSA-N 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Images
Classifications
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Description
しかしながら、アナタース型結晶とルチル型結晶の比率が制御された酸化チタンを工業的に製造するための方法については知られていない。
高活性であり、排水処理、浄水処理、殺菌・藻処理等の処理を必要とする被処理水中の水質汚染有機物質を効率良く分解して除去することができる。
純水で製造した氷を粉砕して容器に入れ、この容器内に四塩化チタン(TiCl4)500gを添加して粉砕した氷と混合し、更に容器内に純水を添加して溶液全体を1,000mlとし、四塩化チタン水溶液(溶液A)を調製した。
また、28wt%-アンモニア水を同量の純水で希釈し、14wt%-アンモニア水(溶液B)を調製した。
続いて、反応容器中には撹拌下に上記溶液Bの710mlを一度に添加した。得られた溶液はpH値8.5となり、この操作により溶液中に酸化チタン前駆体が析出し、溶液はスラリー状になった。
得られた各実験例1〜18の湿潤ケーキを120℃で3時間乾燥し、各実験例1〜18の酸化チタン前駆体を得た。
アナタース型結晶含有率(重量%)=100/[1+1.265(IRu/IAn)]……(1)
これらの結果を表1に示す。
〔2-プロパノール光触媒分解反応試験(液相試験)〕
また、上記各酸化チタン粉末について、下記の2-プロパノール光触媒分解反応試験(液相試験)を行い、光触媒活性を調べた。
耐熱性と光透過性に優れた直径2cm×長さ20cmの大きさの石英ガラス製反応セル内に上記各実験例1〜18の光触媒酸化チタン50mgと2-プロパノール水溶液又は2-ヘキサノール水溶液25ml(65μmol)を入れ、酸素を30分間バブリングした後(酸素雰囲気下)、撹拌して懸濁させながら室温下に1時間光照射し、2-プロパノールの減少率(%)を求めた。この際に、反応セルにはその上部にラバーセプタム(直径2.1cm)を取り付け、また、光照射は、光源の高圧水銀灯(100W)を反応セルから約6cm離して〔デジタル照度計(東京光電社製LX-1330)を高圧水銀灯に対して平行に設置して測定した時の照度が約6150Lux〕行った。
表1に反応開始1時間後における2-プロパノールの分解率(%)を示す。
実験例3及び7の各酸化チタン前駆体から得られた酸化チタン粉末を用い、上記2-プロパノール光触媒分解反応試験(液相試験)において2-プロパノールが完全に炭酸ガス(CO2)に分解されるまでの経時変化を測定し、市販の光触媒酸化チタン粉末〔JRC-TIO-4(P-25)〕(比較例1)と比較した。
結果を図1〜図3に示す。
Claims (7)
- チタン含有酸性水溶液に塩基性水溶液を添加して水酸基を有する酸化チタン前駆体を析出させた後、得られた酸化チタン前駆体スラリー中に、酸性の原料水溶液を添加してpH値を酸化チタン前駆体の溶解領域に降下させると共に原料を追加投入する操作と、この操作で得られたチタン含有酸性水溶液に塩基性水溶液を添加してpH値を酸化チタン前駆体の析出領域に上昇させる操作とからなるpHスイング操作を少なくとも3回以上7回以下の範囲で繰り返して得られた酸化チタン前駆体であり、このpHスイング操作の回数と得られた酸化チタン前駆体を500℃以上600℃以下の高温で焼成する際の温度と時間によって、焼成後にアナタース型結晶(An)とルチル型結晶(Ru)との比率(An/Ru)が1.7〜11.5の範囲内に制御され、かつ、BET表面積が42m 2 /g以上である光触媒酸化チタンを用い、処理水中の水質汚染有機物質を酸化分解することを特徴とする水質汚染有機物質の除去方法。
- 酸化チタン前駆体の溶解領域のpH値が3.5以下であり、酸化チタン前駆体の析出領域のpH値が7以上である請求項1に記載の水質汚染有機物質の除去方法。
- 処理水中の水質汚染有機物質の酸化分解を、処理水中に粉末状又は顆粒状の光触媒酸化チタンを分散させて行う請求項1又は2に記載の水質汚染有機物質の除去方法。
- 処理水中の水質汚染有機物質の酸化分解を、光源ランプが挿入される筒状形状に成形された光触媒酸化チタン又は成形した支持体に固定された光触媒酸化チタンを用いて行う請求項1又は2に記載の水質汚染有機物質の除去方法。
- 処理水中の水質汚染有機物質の酸化分解を、光源ランプのカバーガラスに固定された光触媒酸化チタンを用いて行う請求項1又は2に記載の水質汚染有機物質の除去方法。
- 光触媒酸化チタンに供する光源が、太陽光又はバンド・ギャップより大きなエネルギーを持つ人工的光源である請求項1〜5のいずれかに記載の水質汚染有機物質の除去方法。
- 処理水中の水質汚染有機物質が、有機化学物質又は微生物である請求項1〜6のいずれかに記載の水質汚染有機物質の除去方法。
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