CN109482243A - TiO2The preparation method of/MOF-5 composite photo-catalyst - Google Patents
TiO2The preparation method of/MOF-5 composite photo-catalyst Download PDFInfo
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- 239000013132 MOF-5 Substances 0.000 title claims abstract description 76
- 239000002131 composite material Substances 0.000 title claims abstract description 34
- 239000011941 photocatalyst Substances 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 27
- 239000000243 solution Substances 0.000 claims abstract description 79
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 claims abstract description 70
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000003960 organic solvent Substances 0.000 claims abstract description 41
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000010936 titanium Substances 0.000 claims abstract description 24
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 24
- 150000003751 zinc Chemical class 0.000 claims abstract description 23
- 238000001914 filtration Methods 0.000 claims abstract description 18
- 239000011259 mixed solution Substances 0.000 claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 14
- 230000007062 hydrolysis Effects 0.000 claims abstract description 12
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 12
- 238000005406 washing Methods 0.000 claims abstract description 12
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims abstract description 9
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 claims abstract description 7
- 230000010355 oscillation Effects 0.000 claims abstract description 7
- 238000000227 grinding Methods 0.000 claims abstract description 4
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 24
- 239000008367 deionised water Substances 0.000 claims description 18
- 229910021641 deionized water Inorganic materials 0.000 claims description 18
- 239000002253 acid Substances 0.000 claims description 17
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 16
- 230000002378 acidificating effect Effects 0.000 claims description 15
- 239000003607 modifier Substances 0.000 claims description 14
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 11
- 230000001590 oxidative effect Effects 0.000 claims description 10
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 9
- 239000011701 zinc Substances 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 7
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 6
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 claims description 6
- JMXKSZRRTHPKDL-UHFFFAOYSA-N titanium ethoxide Chemical compound [Ti+4].CC[O-].CC[O-].CC[O-].CC[O-] JMXKSZRRTHPKDL-UHFFFAOYSA-N 0.000 claims description 6
- 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 claims description 6
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 6
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 4
- FPCJKVGGYOAWIZ-UHFFFAOYSA-N butan-1-ol;titanium Chemical compound [Ti].CCCCO.CCCCO.CCCCO.CCCCO FPCJKVGGYOAWIZ-UHFFFAOYSA-N 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 claims description 4
- 230000008020 evaporation Effects 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 229910017604 nitric acid Inorganic materials 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 4
- 229910052725 zinc Inorganic materials 0.000 claims description 4
- XIOUDVJTOYVRTB-UHFFFAOYSA-N 1-(1-adamantyl)-3-aminothiourea Chemical compound C1C(C2)CC3CC2CC1(NC(=S)NN)C3 XIOUDVJTOYVRTB-UHFFFAOYSA-N 0.000 claims description 3
- 235000019441 ethanol Nutrition 0.000 claims description 3
- 238000010992 reflux Methods 0.000 claims description 3
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 claims description 3
- DJWUNCQRNNEAKC-UHFFFAOYSA-L zinc acetate Chemical class [Zn+2].CC([O-])=O.CC([O-])=O DJWUNCQRNNEAKC-UHFFFAOYSA-L 0.000 claims description 3
- 235000013904 zinc acetate Nutrition 0.000 claims description 3
- 235000005074 zinc chloride Nutrition 0.000 claims description 3
- 239000011592 zinc chloride Substances 0.000 claims description 3
- VGUWZCUCNQXGBU-UHFFFAOYSA-N 3-[(4-methylpiperazin-1-yl)methyl]-5-nitro-1h-indole Chemical compound C1CN(C)CCN1CC1=CNC2=CC=C([N+]([O-])=O)C=C12 VGUWZCUCNQXGBU-UHFFFAOYSA-N 0.000 claims description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 2
- SUAKHGWARZSWIH-UHFFFAOYSA-N N,N‐diethylformamide Chemical compound CCN(CC)C=O SUAKHGWARZSWIH-UHFFFAOYSA-N 0.000 claims 1
- 238000002242 deionisation method Methods 0.000 claims 1
- 230000005588 protonation Effects 0.000 claims 1
- 239000002904 solvent Substances 0.000 claims 1
- 230000005595 deprotonation Effects 0.000 abstract description 4
- 238000010537 deprotonation reaction Methods 0.000 abstract description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 22
- 238000006731 degradation reaction Methods 0.000 description 13
- 230000015556 catabolic process Effects 0.000 description 12
- 239000007787 solid Substances 0.000 description 10
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 9
- YRKCREAYFQTBPV-UHFFFAOYSA-N acetylacetone Chemical compound CC(=O)CC(C)=O YRKCREAYFQTBPV-UHFFFAOYSA-N 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 230000001699 photocatalysis Effects 0.000 description 8
- 239000003054 catalyst Substances 0.000 description 7
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 6
- 238000007146 photocatalysis Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 4
- 238000013019 agitation Methods 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 3
- 238000002835 absorbance Methods 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 235000019253 formic acid Nutrition 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- ZHNUHDYFZUAESO-UHFFFAOYSA-N Formamide Chemical compound NC=O ZHNUHDYFZUAESO-UHFFFAOYSA-N 0.000 description 2
- 229960000583 acetic acid Drugs 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 229960004756 ethanol Drugs 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000012362 glacial acetic acid Substances 0.000 description 2
- 239000008236 heating water Substances 0.000 description 2
- 238000003837 high-temperature calcination Methods 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 150000007524 organic acids Chemical class 0.000 description 2
- 239000013110 organic ligand Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 238000001338 self-assembly Methods 0.000 description 2
- 206010013786 Dry skin Diseases 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- ZSDJVGXBJDDOCD-UHFFFAOYSA-N benzene dioctyl benzene-1,2-dicarboxylate Chemical compound C(C=1C(C(=O)OCCCCCCCC)=CC=CC1)(=O)OCCCCCCCC.C1=CC=CC=C1 ZSDJVGXBJDDOCD-UHFFFAOYSA-N 0.000 description 1
- KKSAZXGYGLKVSV-UHFFFAOYSA-N butan-1-ol;titanium Chemical compound [Ti].CCCCO KKSAZXGYGLKVSV-UHFFFAOYSA-N 0.000 description 1
- 210000003850 cellular structure Anatomy 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 229960000935 dehydrated alcohol Drugs 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 125000004494 ethyl ester group Chemical group 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 125000001905 inorganic group Chemical group 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 239000012621 metal-organic framework Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 125000000962 organic group Chemical group 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 238000000643 oven drying Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000013033 photocatalytic degradation reaction Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000000935 solvent evaporation Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- KUCOHFSKRZZVRO-UHFFFAOYSA-N terephthalaldehyde Chemical compound O=CC1=CC=C(C=O)C=C1 KUCOHFSKRZZVRO-UHFFFAOYSA-N 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- YMBCJWGVCUEGHA-UHFFFAOYSA-M tetraethylammonium chloride Chemical compound [Cl-].CC[N+](CC)(CC)CC YMBCJWGVCUEGHA-UHFFFAOYSA-M 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000011882 ultra-fine particle Substances 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
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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
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/26—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
- B01J31/38—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24 of titanium, zirconium or hafnium
-
- 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
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
- B01J31/1691—Coordination polymers, e.g. metal-organic frameworks [MOF]
-
- B01J35/39—
Abstract
A kind of load TiO2Composite photo-catalyst preparation method, the following steps are included: triethylamine is added in the mixed solution of solvable zinc salt, terephthalic acid (TPA) and the first organic solvent, terephthalic acid (TPA) deprotonation and zinc ion is set to be self-assembled into MOF-5, grinding obtains MOF-5 powder after filtration washing is dry；Make hydrolyzable titanium source that hydrolysis occur with water in a second organic solvent, obtains the first solution containing nano-titanium dioxide；First solution is concentrated, improves the concentration of the nano titanic oxide sol, obtains the second solution；And the MOF-5 powder is added in second solution, it is sufficiently mixed by sonic oscillation, filtration washing is dried to obtain TiO2/ MOF-5 composite photo-catalyst.
Description
Technical field
The present invention relates to photocatalysis technology fields, more particularly to a kind of TiO2The preparation side of/MOF-5 composite photo-catalyst
Method.
Background technique
Photocatalysis technology, that is, semiconductor light-catalyst technology can be used to degradation of organic waste water, reducing heavy metal ion, net
Change air, sterilization, antifog etc..Therefore conductor photocatalysis material is got the attention at aspect of curbing environmental pollution.In order to
Photocatalysis efficiency, service life and the stability and safety that guarantee materials'use for improving semiconductor material, are continually developed
Novel photocatalysis material is most important.
Nano-titanium dioxide (TiO2) it is used as a kind of photochemical catalyst, it is a kind of n-type semiconductor of function admirable, it can be with
Solar energy is made full use of, it is not only energy-efficient but also environmentally friendly, and show when reacting preferable photostability and higher
Reactivity, nontoxic, inexpensive is without secondary pollution, is a kind of current application prospect nano-functional material the most wide.
But nano-titanium dioxide, as photochemical catalyst, there is also some problems.One side TiO2Spectral region is narrow, needs
Generation electronics could be excited under ultraviolet light, and ultraviolet light content is less than 5% under sunlight, and nano-titanium dioxide is usually
It is powdered, only a small amount of TiO on surface during the reaction2It absorbs ultraviolet light and plays the role of light-catalysed, thus cause
Photo-quantum efficiency is lower.On the other hand, suspension reaction system is generallyd use in photocatalytic degradation solution when pollutant, and nanometer two
It is in stable emulsus dispersing morphology, TiO that the ultrafine particle form of titanium oxide, which causes nano-titanium dioxide in the reaction system,2?
Difficult separation, recycling are difficult in degradation process, and are unfavorable for the reuse of catalyst.
MOF-5 is a most typical representative in metal-organic framework complex family, and MOF-5 is by 4 Zn2+With 1
O2-[the Zn formed4O]6+Inorganic group and organic group [O2C-C-C6H4-CO2]2-The three-dimensional formed with octahedral form connection
Solid rigid skeleton structure, chemical basic unit are Zn4O(BDC)3.Each Zn4O cluster connects with 6 organic ligand units respectively
It connects, and each organic ligand and 2 Zn4O unit is connected, and has three-dimensional orthogonal cellular structure.Yaghi seminar Hailian
The MOF-5 specific surface area that Li et al. reports that they prepare is up to 2900m2The MOF-5 specific surface area of the reports such as/g, Rowsell can be with
Reach 3362m2/g.The huge specific surface area of MOF-5 and pore volume can not only accommodate a large amount of TiO2, also it is adsorbable enrichment it is organic
Object improves mass transfer rate, significantly high TiO2Catalytic degradation efficiency, MOF-5 are a kind of very potential frame compounds.But
It how is by TiO2Loading on MOF-5 is a problem.
Summary of the invention
Based on this, it is necessary to for the problem that MOF-5 load is difficult, provide a kind of TiO2/ MOF-5 composite photo-catalyst
Preparation method.
The present invention provides a kind of TiO2The preparation method of/MOF-5 composite photo-catalyst, comprising the following steps:
Triethylamine is added in the mixed solution of solvable zinc salt, terephthalic acid (TPA) and the first organic solvent, makes terephthaldehyde
Sour deprotonation and zinc ion are self-assembled into MOF-5, and grinding obtains MOF-5 powder after filtration washing is dry；
Make hydrolyzable titanium source that hydrolysis occur with water in a second organic solvent, obtains containing nano-titanium dioxide
First solution；
First solution is concentrated, improves the concentration of the nano titanic oxide sol, obtains the second solution；And
The MOF-5 powder is added in second solution, is sufficiently mixed by sonic oscillation, filtration washing is dry
Obtain TiO2/ MOF-5 composite photo-catalyst.
The mass ratio of the MOF-5 and second solution that are added in one of the embodiments, are 1:10~1:
100。
The concentration step includes by the volume of first solution evaporation 1/5~1/2 in one of the embodiments,.
The step of hydrolysis includes: in the second organic solvent, acidic ph modifier in one of the embodiments,
With the mixed solution and dripping deionized water of titanium source, TiO 2 sol solution, institute then are obtained in 40~65 DEG C of heating stirrings
The volume ratio for stating acidic ph modifier, titanium source, organic solvent and deionized water is 1:8~15:80~150:150~250.
The step of forming first solution in one of the embodiments, further include: Xiang Suoshu TiO 2 sol is molten
Strong oxidizing property acid solution is added dropwise in liquid, is then heated to reflux at 60~85 DEG C.
The strong oxidizing property acid solution is nitric acid or sulfuric acid, the strong oxidizing property acid solution in one of the embodiments,
Middle H+Concentration be 0.1~0.2mol/L, the volume and the TiO 2 sol solution that the strong oxidizing property acid solution is added
Volume ratio be 1:1.2~2.
The molar ratio of the solvable zinc salt and the terephthalic acid (TPA) is 1:0.8~1 in one of the embodiments:
1.5, the mass ratio of the solvable zinc salt and first organic solvent is 1:30~1:50, the triethylamine and the soluble zinc
The mass ratio of salt is 1:0.5~1:3.
The solvable zinc salt includes in two water zinc acetates, zinc nitrate hexahydrate and zinc chloride in one of the embodiments,
It is at least one.
The titanium source includes butyl titanate, tetraethyl titanate, tetraisopropyl titanate, uncle in one of the embodiments,
Butanol titanium, at least one of metatitanic acid diethylester and titanium tetrachloride.
First organic solvent includes n,N-Dimethylformamide, N- crassitude in one of the embodiments,
Ketone, N, at least one of N- diethylformamide, dimethyl sulfoxide, deionized water, triethylamine and hydrogen peroxide；Described second
Organic solvent includes at least one of methanol, ethyl alcohol and isopropanol.
TiO provided by the invention2The preparation method of/MOF-5 composite photo-catalyst, is prepared using the method for self assembly
MOF-5 recycles the hydrolysis of titanium source to prepare the solution of Nano titanium dioxide colloidal sol, and improving collosol concentration by concentration can
It is loaded in the duct MOF-5 so that nanoscale TiO 2 sol is uniform and stable, improves TiO2/ MOF-5 composite photocatalyst
Agent catalytic degradation efficiency.
Detailed description of the invention
Fig. 1 is the TiO of preparation of the embodiment of the present invention2The XRD spectra of/MOF-5 composite photo-catalyst；
Fig. 2 is the TiO of preparation of the embodiment of the present invention2The scanning electron microscope SEM of/MOF-5 composite photo-catalyst schemes.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, by the following examples, it and combines attached
Figure, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only to explain this hair
It is bright, it is not intended to limit the present invention.
The embodiment of the present invention provides a kind of TiO2The preparation method of/MOF-5 composite photo-catalyst, comprising the following steps:
S10 is added triethylamine in the mixed solution of solvable zinc salt, terephthalic acid (TPA) and the first organic solvent, makes to benzene
Dioctyl phthalate deprotonation and zinc ion are self-assembled into MOF-5, and grinding obtains MOF-5 powder after filtration washing is dry；
S20 makes hydrolyzable titanium source that hydrolysis occur with water in a second organic solvent, obtains containing nanometer titanium dioxide
First solution of titanium colloidal sol；
S30 is concentrated first solution, improves the concentration of the nano titanic oxide sol, obtain the second solution；And
The MOF-5 powder is added in second solution, is sufficiently mixed by sonic oscillation, filtration washing by S40
It is dried to obtain TiO2/ MOF-5 composite photo-catalyst.
TiO provided by the invention2The preparation method of/MOF-5 composite photo-catalyst, is prepared using the method for self assembly
MOF-5 recycles the hydrolysis of titanium source to prepare the solution of Nano titanium dioxide colloidal sol, and improving collosol concentration by concentration can
It is loaded in the duct MOF-5 so that nanoscale TiO 2 sol is uniform and stable, improves TiO2/ MOF-5 composite photocatalyst
Agent catalytic degradation efficiency.
In step S10, the preparation method of the mixed solution of the solvable zinc salt, terephthalic acid (TPA) and the first organic solvent can
The terephthalic acid (TPA) is added including the solvable zinc salt to be dissolved into first organic solvent, or by described to benzene two
Formic acid, which is dissolved into first organic solvent, adds the solvable zinc salt, can also be by the solvable zinc salt and described to benzene two
Formic acid is dissolved into respectively in first organic solvent, then again by the solvable zinc solution and the terephthalic acid solution
Mixing adds in first organic solvent after can also mixing the solvable zinc salt and the terephthalic acid (TPA)；Preferably
Solvable zinc salt is dissolved into first organic solvent and adds the terephthalic acid (TPA).Above-mentioned mixing step can be in room temperature
It carries out, such as at 10 DEG C to 30 DEG C, is preferably carried out at 25 DEG C.Above-mentioned mixing step is specifically as follows mechanical stirring or ultrasound vibration
It swings, zinc salt and terephthalic acid (TPA) is made to be substantially dissolved in the first organic solvent and mutually uniformly mix.
The mass ratio of the solvable zinc salt and first organic solvent is preferably 1:30~1:50, and more preferably 1:30~
The molar ratio of 1:40, the terephthalic acid (TPA) and the solvable zinc salt is preferably 1:0.8~1:2, more preferably 1:1.5~1:2.
Preferably, the solvable zinc salt includes at least one of two water zinc acetates, zinc nitrate hexahydrate and zinc chloride.It is described
Solvable zinc salt provides zinc source, is coordinated to obtain MOF-5 with the terephthalic acid (TPA).
Preferably, first organic solvent includes n,N-Dimethylformamide, N-Methyl pyrrolidone, N, N- diethyl
At least one of formamide and dimethyl sulfoxide.First organic solvent can dissolve the solvable zinc salt and described to benzene two
Formic acid, and the coordination of the terephthalic acid (TPA) and zinc ion will not be had an impact.
In step S10, the triethylamine can be added at normal temperature, such as at 10 DEG C to 30 DEG C, add preferably at 25 DEG C
Enter.It is stirred continuously while the triethylamine is added, the time of stirring is preferably 1h~3h, the triethylamine of addition and described
The mass ratio of solvable zinc salt is preferably 1:0.5~1:3, more preferably 1:1~1:3.By the way that the triethylamine is added, can make pair
Phthalic acid deprotonation generates MOF-5 with the self-service dress of zinc ion.It can be seen that there is white solid generation in whipping process, stir
It mixes and the white solid is taken out into press filtration after enough time removes unreacted nothing with described first organic solvent washing 3-4 times
Then the solid being obtained by filtration is placed in oven and dried by machine salt and organic acid, finally by dried solid abrasive at powder,
Obtain MOF-5 powder.
In step S20, the step of hydrolysis, includes:
Then S22 exists in the mixed solution and dripping deionized water of the second organic solvent, acidic ph modifier and titanium source
40~65 DEG C of heating stirrings obtain TiO 2 sol solution.
The acidic ph modifier, titanium source, the volume ratio of the second organic solvent and deionized water are preferably 1:8~15:80
~150:150~250.The titanium source includes butyl titanate, tetraethyl titanate, tetraisopropyl titanate, tert-butyl alcohol titanium, metatitanic acid two
At least one of ethyl ester and titanium tetrachloride.Second organic solvent includes at least one of methanol, ethyl alcohol and isopropanol.
The pH value of the mixed solution of second organic solvent, acidic ph modifier and titanium source is preferably 3~4.The acid pH is adjusted
Agent is preferably acid weaker acid, such as at least one of glacial acetic acid, citric acid.By the way that weak acid is added, pH value is adjusted 3~4,
Hydrolysis that can be stable generates TiO2Nanoscale colloidal sol avoids hydrolyzing too fast.
The preparation method of the mixed solution of second organic solvent, acidic ph modifier and titanium source can include: first by institute
The second organic solvent and acidic ph modifier 5~30min of magnetic agitation are stated, is sufficiently mixed to obtain second organic solvent and institute
The mixed solution of acidic ph modifier is stated, then the titanium source is added to second organic solvent and the acidic ph modifier
Mixed solution in be sufficiently mixed, 5~30min of magnetic agitation obtains second organic solvent, acidic ph modifier and titanium source
Mixed solution.
In the mixed solution and dripping deionized water of the second organic solvent, acidic ph modifier and titanium source the step of, lead to
The rate of addition for crossing the deionized water can control the speed of the hydrolysis, in order to keep the hydrolysis stable into
Row, deionized water are preferably slowly added dropwise, while lasting stirring, and in one embodiment, the deionized water time for adding exists
15min~30min.The mixed solution of second organic solvent, acidic ph modifier and titanium source is prepared, and in the mixing
The step of deionized water is added dropwise in solution preferably carries out at normal temperature.It is white that the solution that deionized water is reacted, which is added dropwise,
Turbid solution generates TiO in solution2Colloidal sol.
After the deionized water is added dropwise, the mixed solution is warming up to 40~65 DEG C, continuing heated at constant temperature stirring makes water
Solution reaction sufficiently carries out, and the time of the heating stirring is preferably 10min~40min.
In a preferred embodiment, after the step of forming the TiO 2 sol solution further include:
Strong oxidizing property acid solution is added dropwise in the TiO 2 sol solution of S24, Xiang Suoshu white opacity, then 60~85
It DEG C is heated to reflux, the solution of white opacity is made to be changed into translucent stable sol solution.The step in Strong oxdiative acidic environment and
Under temperature collective effect, unformed TiO can be made2Colloidal sol is to nano-sized anatase type TiO2Crystalline transformation makes in colloidal tio 2
Generate nanoscale Detitanium-ore-type crystal phase.On the one hand, Detitanium-ore-type TiO2With higher catalytic activity, on the other hand, directly
TiO is generated in the solution2Crystal phase may not need the step of high-temperature calcination crystallization is carried out after loading with MOF-5.The strong oxygen
The property changed acid solution is nitric acid or sulfuric acid, H in the strong oxidizing property acid solution+Concentration be preferably 0.1~0.2mol/L, it is described strong
The volume ratio of volume and the TiO 2 sol solution that oxidizing acid solution is added is preferably 1:1.2~2.
In order to improve the TiO of MOF-5 load2Content, in step S30, the concentration step is preferably included described
The volume of one solution evaporation 1/5~1/2.The step of evaporation, can carry out in 70~100 DEG C of baking ovens, make first solution
In volatile the second organic solvent evaporation, improve the concentration of the nano titanic oxide sol.
In step S40, the mass ratio of the MOF-5 of addition and second solution is preferably 1:10~1:100, more excellent
It is selected as 1:20~1:50.The sonic oscillation time is preferably 30-60min, can make the TiO in second solution2As far as possible
More is supported on the MOF-5, and load is then had TiO2MOF-5 filtering, wash simultaneously dry, dry temperature is excellent
It is selected as 80~120 DEG C.Specifically, the load being obtained by filtration can be had TiO2MOF-5 solid take out press filtration, use deionized water
Or organic solvent washing 3-4 times, then the solid being obtained by filtration is placed in oven and dried.
The TiO2The XRD spectrum of/MOF-5 composite photo-catalyst is as described in Figure 1, and map shows the peak feature of MOF-5
And TiO2Peak feature, it was demonstrated that the TiO2In/MOF-5 composite photo-catalyst, without high-temperature calcination, it can be obtained by solwution method
To Detitanium-ore-type TiO2Crystal, and TiO2Crystal load is on MOF-5.
The TiO2The scanning electron microscope SEM of/MOF-5 composite photo-catalyst schemes as shown in Fig. 2, can be more from figure
It is immediately seen, TiO2It is supported in the duct of MOF-5.
Embodiment 1
S10, first by the Zn (NO of 1.21g3)2·6H2O and 40ml n,N-Dimethylformamide (DMF) is contained in beaker,
Then at room temperature by 0.34g terephthalic acid (TPA) (H2BDC it) is added in beaker, is stirred continuously, after solid is completely dissolved, then will
1.3mL triethylamine TEAC is added in mixed solution, is stirred continuously, and about 3h is reacted, and takes out press filtration, is used during taking out press filtration
DMF is washed 3-4 times, is removed unreacted inorganic salts and organic acid, is obtained white solid.Finally white solid is put into baking oven
Drying.Drying is ground into powder later, obtains MOF-5 powder.
S22 takes 20ml dehydrated alcohol to be added in clean, dry flask, drips 0.2ml glacial acetic acid using rubber head dropper drop 4,
Magnetic agitation 5min；2ml butyl titanate is taken to be added in above-mentioned mixed liquor, magnetic agitation 5min；It is slowly added dropwise while stirring
38ml deionized water, time for adding are greater than 15min, solution are heated to 45 DEG C after dripping and persistently stirs 30min, obtains white
Turbid solution.
S24 takes 0.15mol/L nitric acid 40ml, is added dropwise in above-mentioned white opacity solution, and rate of addition can be slightly fast, 5min
~10min is dripped off, and condenser pipe is added after dripping on flask, bath temperature is risen to 75 DEG C of constant temperature persistently stirs 5h and obtain half
Transparent and stable contains the first solution of nano titanic oxide sol.
S30 takes the first solution of 50ml, is placed in 80 DEG C of baking ovens, evaporates the volume of the first solution 1/3, obtains second
Solution.
The MOF-5 powder of 5g is added in the second solution, sonic oscillation 40min by S40, dry at 100 DEG C after filtration washing
It is dry, obtain TiO2/ MOF-5 composite photo-catalyst.
Embodiment 2
Preparation method is substantially the same manner as Example 1, the difference is that, in step S30, evaporate the first solution 1/2
Volume.
Embodiment 3
Preparation method is substantially the same manner as Example 1, the difference is that, in step S30, evaporate the first solution 1/4
Volume.
Comparative example
Preparation method is substantially the same manner as Example 1, the difference is that, without step S30, directly by the MOF-5 of 5g
Powder is added in the first solution, sonic oscillation 40min, in 100 DEG C of dryings after filtration washing, obtains TiO2/ MOF-5 complex light
Catalyst.
Experimental example
TiO prepared by embodiment 1-3 and comparative example2/ MOF-5 composite photo-catalyst is real for formaldehyde degradation by photocatalytic oxidation process
It tests, experimental method is as follows:
TiO is carried out in homemade photocatalysis experimental box2Formaldehyde degradation by photocatalytic oxidation process experiment, is catalyzed by ultraviolet source irradiation
The formaldehyde in degradation aqueous solution is realized in agent, the degradation that the reactivity of photochemical catalyst passes through measurement illumination formaldehyde after a certain period of time
Rate is evaluated.
Test method: accurately pipetting 2mL formaldehyde stock solution and 100mL water in reaction tank, shake up, and obtains solution a.
2.5mL formalin accurately is pipetted in test tube, adds deionized water to 25mL, while doing a blank test, with
25mL water replaces examination.Again plus 2.5mL acetylacetone,2,4-pentanedione solution, it shakes up, the heating water bath 10min in 90~100 DEG C, takes out cooling.
At wavelength 414nm, using water as reference measurement absorbance A0。
Catalyst 0.25g is weighed in reaction tank, is shaken up, solution b is obtained, is put into reactor, ultraviolet lamp is opened and carries out light
According to degradation 5h, wherein a sample is taken per hour, first jog reaction tank, is uniformly mixed solution b before taking, a moment is then stood again,
About 5mL solution b is pipetted in test tube, adding deionized water while to do a blank test to 25mL, with 25mL water generation with pipette again
For examination.Again plus 2.5mL acetylacetone,2,4-pentanedione solution, it shakes up, the heating water bath 10min in 90~100 DEG C, takes out cooling.In wavelength
At 414nm, using water as reference measurement absorbance At。
Degradation rate D% is calculated using following formula:
A in formula0, AtAbsorbance respectively before reaction with solution when reacting t moment；
Experimental result is as shown in table 1:
Table 1
| Embodiment | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example |
| Degradation Formaldehyde rate | 86% | 88% | 67% | 54% |
As it can be seen from table 1 the TiO of embodiment 1-3 preparation2The Degradation Formaldehyde rate of/MOF-5 composite photo-catalyst is than comparison
Example is high, illustrates concentrate solution, improves the concentration of nano titanic oxide sol, is conducive to improve TiO2/ MOF-5 composite photo-catalyst
Catalytic efficiency.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of TiO2The preparation method of/MOF-5 composite photo-catalyst, which comprises the following steps:
Triethylamine is added in the mixed solution of solvable zinc salt, terephthalic acid (TPA) and the first organic solvent, removes terephthalic acid (TPA)
Protonation is self-assembled into MOF-5 with zinc ion, and grinding obtains MOF-5 powder after filtration washing is dry；
Make hydrolyzable titanium source that hydrolysis occur with water in a second organic solvent, obtains first containing nano-titanium dioxide
Solution；
First solution is concentrated, improves the concentration of the nano titanic oxide sol, obtains the second solution；And
The MOF-5 powder is added in second solution, is sufficiently mixed by sonic oscillation, filtration washing is dried to obtain
TiO2/ MOF-5 composite photo-catalyst.
2. TiO according to claim 12The preparation method of/MOF-5 composite photo-catalyst, which is characterized in that addition it is described
The mass ratio of MOF-5 and second solution is 1:10~1:100.
3. TiO according to claim 12The preparation method of/MOF-5 composite photo-catalyst, which is characterized in that the concentration step
It suddenly include by the volume of first solution evaporation 1/5~1/2.
4. TiO according to claim 12The preparation method of/MOF-5 composite photo-catalyst, which is characterized in that the hydrolysis is anti-
The step of answering includes: the mixed solution and dripping deionized water in the second organic solvent, acidic ph modifier and titanium source, is then existed
40~65 DEG C of heating stirrings obtain TiO 2 sol solution, the acidic ph modifier, titanium source, organic solvent and deionized water
Volume ratio be 1:8~15:80~150:150~250.
5. TiO according to claim 42The preparation method of/MOF-5 composite photo-catalyst, which is characterized in that form described the
The step of one solution further include: strong oxidizing property acid solution is added dropwise in Xiang Suoshu TiO 2 sol solution, then at 60~85 DEG C
It is heated to reflux.
6. TiO according to claim 42The preparation method of/MOF-5 composite photo-catalyst, which is characterized in that the Strong oxdiative
Property acid solution be nitric acid or sulfuric acid, H in the strong oxidizing property acid solution+Concentration be 0.1~0.2mol/L, the strong oxidizing property
The volume ratio of volume and the TiO 2 sol solution that acid solution is added is 1:1.2~2.
7. TiO according to claim 12The preparation method of/MOF-5 composite photo-catalyst, which is characterized in that the soluble zinc
The molar ratio of salt and the terephthalic acid (TPA) is 1:0.8~1:1.5, the quality of the solvable zinc salt and first organic solvent
Than for 1:30~1:50, the mass ratio of the triethylamine and the solvable zinc salt is 1:0.5~1:3.
8. TiO according to claim 12The preparation method of/MOF-5 composite photo-catalyst, which is characterized in that the soluble zinc
Salt includes at least one of two water zinc acetates, zinc nitrate hexahydrate and zinc chloride.
9. TiO according to claim 12The preparation method of/MOF-5 composite photo-catalyst, which is characterized in that the titanium source packet
Include butyl titanate, tetraethyl titanate, tetraisopropyl titanate, tert-butyl alcohol titanium, at least one in metatitanic acid diethylester and titanium tetrachloride
Kind.
10. TiO according to claim 12The preparation method of/MOF-5 composite photo-catalyst, which is characterized in that described first has
Solvent includes N,N-dimethylformamide, N-Methyl pyrrolidone, N, N- diethylformamide, dimethyl sulfoxide, deionization
At least one of water, triethylamine and hydrogen peroxide；Second organic solvent include in methanol, ethyl alcohol and isopropanol at least
It is a kind of.
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| CN116941612B (en) * | 2023-09-21 | 2023-12-29 | 江西联普人农业科技有限公司 | Pesticide residue degradation agent and preparation method thereof |
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