CN102698809A - Preparation method of H3PW12O40/ nanometer TiO2 composite photocatalyst - Google Patents
Preparation method of H3PW12O40/ nanometer TiO2 composite photocatalyst Download PDFInfo
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- CN102698809A CN102698809A CN2012101454182A CN201210145418A CN102698809A CN 102698809 A CN102698809 A CN 102698809A CN 2012101454182 A CN2012101454182 A CN 2012101454182A CN 201210145418 A CN201210145418 A CN 201210145418A CN 102698809 A CN102698809 A CN 102698809A
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Abstract
The invention provides a preparation method of an H3PW12O40/ nanometer TiO2 composite photocatalyst, and relates to the preparation method of a catalyst, adopting an alcoholysis method to prepare the H3PW12O40/ nanometer TiO2 composite photocatalyst with rather large specific surface area and high photocatalytic activity, wherein H3PW12O40 is doped in the preparation process, and the doping amount calculated based on the molar ratio of P and Ti is that the proportion of the P to the Ti is (0.1-1.0) to 10.0. The prepared H3PW12O40/ nanometer TiO2 composite photocatalyst is uniform in crystal granule size distribution with the diameter smaller than 30nm and the specific surface area larger than 190 square meters per gram. The nanometer titanium dioxide is obviously improved in the photocatalytic activity after being doped with the H3PW12O40, a visible absorption photocatalysis function is provided, the utilization rate of sunlight is greatly increased, the adaption range is wide, and the application prospect in the fields such as photocatalytic oxidization and wastewater treatment is wide.
Description
Technical field
The present invention relates to a kind of Preparation of catalysts method, particularly relate to a kind of H
3PW
12O
40/ nano-TiO
2The preparation method of composite photo-catalyst.
Background technology
Nano-TiO
2Be a kind of nontoxic novel inorganic functional material, have that the surface atom ratio is high, specific area big, the lattice surface degree of imperfection is big, the surface can high plurality of advantages obtains that organic matter is synthetic, noble metal recovery, wastewater treatment, purify air and the extensive concern in field such as Optical Electro-Chemistry.Nano-TiO
2Under the irradiation of ultraviolet light; Can produce light induced electron and hole; Light induced electron has strong reducing power, and photohole has strong oxidability, and light induced electron and cavity energy decompose, purify like inorganic and organic wastewaters such as ammonia, amine, phenols; Have advantages such as oxidability is strong, degraded is thorough, non-secondary pollution, become one of novel waste method for treating water.But with nano-TiO
2Carry out commercial Application and still face several of main problems, low etc. like light induced electron and photohole easy compound, quantum yield, the method that overcomes this shortcoming has metal ion mixing, noble metal loading, surface light sensitization, nonmetal doping etc.
Heteropoly acid (salt) all has very strong advantages such as absorption with its unique acidity, " accurate liquid phase " behavior, multi-functional (acid, oxidation, photoelectrocatalysis) and polyacid compound in the ultraviolet-visible light district as one type of novel catalysis material, and it is receiving extensive concern aspect processing of difficult degradation pollutant.Heteropoly acid is doped to TiO
2After, can catch TiO
2The electronics that under photocatalysis, produces increases the carrier diffusion length, prolongs the life-span in electronics and hole, suppresses the compound of electron hole, thereby improves nano-TiO
2Photocatalytic activity.In addition, TiO
2Greater band gap (Detitanium-ore-type 3.2eV), can only absorb the light of ultraviolet and near ultraviolet ray, lower to solar energy utilization rate.Heteropoly acid is a wide-band gap material, and absworption peak is mainly in the ultra-violet (UV) band, but its bands of a spectrum can extend to visible region.It is active under the black light irradiation, to have higher response, electric charge-hole takes place separate, and produces hydroxyl radical free radical through autoxidation and realizes organic degradation.Through heteropoly acid and TiO
2Therefore the compound high efficiency photocatalyst that under visible light, gets final product catalytic reaction that makes becomes the focus that people study.
Summary of the invention
The object of the present invention is to provide a kind of H
3PW
12O
40/ nano-TiO
2The preparation method of composite photo-catalyst, gained composite photocatalyst material crystal grain even size distribution, diameter is less than 30 nm, and specific area is greater than 190 m
2/ g, the photochemical catalyst that makes have the high light catalytic activity under visible light, improved the utilization rate to sunshine greatly.
The objective of the invention is to realize through following technical scheme:
A kind of H
3PW
12O
40/ nano-TiO
2The preparation method of composite photo-catalyst, H mixes in the preparation process
3PW
12O
40, doping is with the molar ratio computing of P element in the photochemical catalyst and Ti element, and its value is P: Ti=(0.1 ~ 1.0): 10.0; The preparation process is following:
(1) with H
3PW
12O
40Be dissolved in the deionized water, slowly splash into absolute alcohol under stirring and mix, be made into A solution;
(2) TiO 2 precursor and organic acid are mixed, titanium source and organic acid mol ratio are 1:1 ~ 10, stir down slowly to join in the mixed liquor of absolute alcohol and acetylacetone,2,4-pentanedione, and organic acid is 1:1 ~ 10 with the mol ratio of alcohol, and regulator solution pH value is made into B solution;
(3) stir fast down, A solution is slowly splashed in the B solution, obtain the solution of homogeneous transparent, continue to stir 1-3h up to forming the translucent colloidal sol of stable and uniform;
(4) colloidal sol is still aging in air, in 60-90 ℃ of thermostatic drying chamber, carry out dried, obtain xerogel, grind into powder;
(5) gel after will grinding put into Muffle furnace under nitrogen protection 400-600 ℃ carry out high-temperature roasting 1-3h and can obtain H
3PW
12O
40/ nano-TiO
2Composite photo-catalyst.
Described a kind of H
3PW
12O
40/ nano-TiO
2The preparation method of composite photo-catalyst, described H
3PW
12O
40/ nano-TiO
2Composite photo-catalyst crystal grain even size distribution, diameter is less than 30 nm with greater than 190 m
2The specific area of/g.
Described a kind of H
3PW
12O
40/ nano-TiO
2The preparation method of composite photo-catalyst is a TiO 2 precursor with tetraethyl titanate, isopropyl titanate or tetra-n-butyl titanate.
Described a kind of H
3PW
12O
40/ nano-TiO
2The preparation method of composite photo-catalyst, described alcohol is one or more pure mixtures of ethanol, ethylene glycol, propyl alcohol, propane diols, glycerine, butanols or butanediol.
Described a kind of H
3PW
12O
40/ nano-TiO
2The preparation method of composite photo-catalyst, described organic acid is acetate, propionic acid, ethanedioic acid, one or more sour mixtures of butyric acid.
Advantage of the present invention and effect are:
1. preparation method of the present invention is simple, easy and simple to handle, and reaction condition is gentle, and preparation time is short, is easy to apply.
2. the H of the present invention preparation
3PW
12O
40/ nano-TiO
2Composite photocatalyst material has response to visible light, has improved the utilization rate to sunshine greatly, and is applied widely, has wide practical use in fields such as photochemical catalytic oxidation, wastewater treatments.
Description of drawings
Fig. 1 is degradation of methylene blue figure under the photochemical catalyst simulated solar irradiation prepared in the embodiment of the invention.
The specific embodiment
Below in conjunction with embodiment the present invention is elaborated.
Embodiment 1:
At room temperature; In 500 mL there-necked flasks of magnetic stirring apparatus, dropping funel are housed; Add 40 mL butyl titanates and be dissolved in 80 mL absolute ethyl alcohols; Be added dropwise to 10 mL acetylacetone,2,4-pentanediones and 15 mL glacial acetic acid mixed liquors under the magnetic agitation, transfer pH=1. 5 with HCl after, add with 1 droplet/second speed and to contain 68.0 g phosphotungstic acid (H
3PW
12O
40) 10 mL absolute alcohols and the mixed liquor of 5 mL water, dropwise continued and stir 2 h, leave standstill 24 h, obtain the translucent colloidal sol of stable and uniform.With colloidal sol at 80 ℃ of drying box inner drying 10 h, grind into powder, 500 ℃ of roasting 2 h in the Muffle furnace obtain H under nitrogen protection
3PW
12O
40/ nano-TiO
2Composite catalyst.
Do light source (simulated solar irradiation) with the halogen tungsten lamp of power 500 W; Carry out the reaction of photocatalytic degradation methylene blue, the initial reaction condition is: methylene blue initial concentration 10 mg/L, catalyst amount 1.0 g/L; Light application time 2 h; Mixing speed 180 r/min, the quartz ampoule that methylene blue solution and photochemical catalyst are housed is apart from light source 20 cm, and the degradation rate of methylene blue can reach 76%, and (curve among Fig. 1 is a).
Embodiment 2:
At room temperature; In 500 mL there-necked flasks of magnetic stirring apparatus, dropping funel are housed; Add 40 mL isopropyl titanates and be dissolved in 80 mL absolute ethyl alcohols; Be added dropwise to the mixed liquor of 10 mL acetylacetone,2,4-pentanediones and 15 mL glacial acetic acid under the magnetic agitation, transfer pH=1. 5 with HCl after, add with 1 droplet/second speed and to contain 7.0 g phosphotungstic acid (H
3PW
12O
40) 10 mL absolute alcohols and the mixed liquor of 5 mL water, dropwise continued and stir 2 h, leave standstill 24 h, obtain the translucent colloidal sol of stable and uniform.With colloidal sol at 80 ℃ of drying box inner drying 10 h, grind into powder, 600 ℃ of roasting 1 h in the Muffle furnace obtain H under nitrogen protection
3PW
12O
40/ nano-TiO
2Composite catalyst.
Do light source (simulated solar irradiation) with the halogen tungsten lamp of power 500 W; Carry out the reaction of photocatalytic degradation methylene blue, the initial reaction condition is: methylene blue initial concentration 10 mg/L, catalyst amount 1.0 g/L; Light application time 2 h; Mixing speed 180 r/min, the quartz ampoule that methylene blue solution and photochemical catalyst are housed are apart from light source 20 cm, and the degradation rate of methylene blue can reach 72% (the curve b among Fig. 1).
Claims (5)
1. H
3PW
12O
40/ nano-TiO
2The preparation method of composite photo-catalyst is characterized in that, H mixes in the preparation process
3PW
12O
40, doping is with the molar ratio computing of P element in the photochemical catalyst and Ti element, and its value is P: Ti=(0.1 ~ 1.0): 10.0; The preparation process is following:
(1) with H
3PW
12O
40Be dissolved in the deionized water, slowly splash into absolute alcohol under stirring and mix, be made into A solution;
(2) TiO 2 precursor and organic acid are mixed, titanium source and organic acid mol ratio are 1:1 ~ 10, stir down slowly to join in the mixed liquor of absolute alcohol and acetylacetone,2,4-pentanedione, and organic acid is 1:1 ~ 10 with the mol ratio of alcohol, and regulator solution pH value is made into B solution;
(3) stir fast down, A solution is slowly splashed in the B solution, obtain the solution of homogeneous transparent, continue to stir 1-3h up to forming the translucent colloidal sol of stable and uniform;
(4) colloidal sol is still aging in air, in 60-90 ℃ of thermostatic drying chamber, carry out dried, obtain xerogel, grind into powder;
(5) gel after will grinding put into Muffle furnace under nitrogen protection 400-600 ℃ carry out high-temperature roasting 1-3h and can obtain H
3PW
12O
40/ nano-TiO
2Composite photo-catalyst.
2. a kind of H according to claim 1
3PW
12O
40/ nano-TiO
2The preparation method of composite photo-catalyst is characterized in that, described H
3PW
12O
40/ nano-TiO
2Composite photo-catalyst crystal grain even size distribution, diameter is less than 30 nm with greater than 190 m
2The specific area of/g.
3. a kind of H according to claim 1
3PW
12O
40/ nano-TiO
2The preparation method of composite photo-catalyst is characterized in that, is TiO 2 precursor with tetraethyl titanate, isopropyl titanate or tetra-n-butyl titanate.
4. a kind of H according to claim 1
3PW
12O
40/ nano-TiO
2The preparation method of composite photo-catalyst is characterized in that, described alcohol is one or more pure mixtures of ethanol, ethylene glycol, propyl alcohol, propane diols, glycerine, butanols or butanediol.
5. a kind of H according to claim 1
3PW
12O
40/ nano-TiO
2The preparation method of composite photo-catalyst is characterized in that, described organic acid is acetate, propionic acid, ethanedioic acid, one or more sour mixtures of butyric acid.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103599807A (en) * | 2013-12-05 | 2014-02-26 | 河南师范大学 | TiO2-BaTaO2N composite photocatalyst and preparation method thereof |
| CN103599808A (en) * | 2013-12-05 | 2014-02-26 | 河南师范大学 | TiO2-SrTaO2N composite photocatalyst and preparation method thereof |
| CN103611560A (en) * | 2013-12-05 | 2014-03-05 | 河南师范大学 | TiO2-CaTaO2N composite photocatalyst and preparation method thereof |
| CN103962185A (en) * | 2014-05-15 | 2014-08-06 | 北京化工大学 | Method for synthesizing phosphotungstic acid-titanium dioxide composite spherical nanometer material by one-step sol-gel method |
| CN104525262A (en) * | 2014-12-29 | 2015-04-22 | 辽宁石油化工大学 | Preparation method of phosphotungstic acid and carbon nitride composite photocatalyst |
| CN109046411A (en) * | 2018-10-16 | 2018-12-21 | 九江学院 | A kind of visible light-responded high activity TiO2The preparation method of composite photo-catalyst |
| CN109967122A (en) * | 2019-04-11 | 2019-07-05 | 东北师范大学 | Immobilized AlCl_3 catalyst and the preparation method and application thereof |
| CN110252403A (en) * | 2019-06-18 | 2019-09-20 | 重庆化工职业学院 | A kind of composite photocatalyst material and its preparation method and application |
| CN110813339A (en) * | 2019-11-29 | 2020-02-21 | 吉林师范大学 | Defect heteropoly blue/TiO2Preparation method of composite visible light synthetic ammonia catalyst |
| CN111659429A (en) * | 2020-06-17 | 2020-09-15 | 宁波大学 | Preparation method of cadmium sulfide-cesium phosphotungstate composite material and application of composite material as visible-light-driven photocatalyst to hydrogen preparation |
| CN112958123A (en) * | 2021-01-26 | 2021-06-15 | 浙江洲钜科技有限公司 | Composite photocatalyst and preparation method and application thereof |
| CN114452988A (en) * | 2021-12-31 | 2022-05-10 | 中国石油天然气股份有限公司 | Supported heteropoly acid nano catalyst and preparation method thereof, and preparation method of aryl methyl stearate |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103599807A (en) * | 2013-12-05 | 2014-02-26 | 河南师范大学 | TiO2-BaTaO2N composite photocatalyst and preparation method thereof |
| CN103599808A (en) * | 2013-12-05 | 2014-02-26 | 河南师范大学 | TiO2-SrTaO2N composite photocatalyst and preparation method thereof |
| CN103611560A (en) * | 2013-12-05 | 2014-03-05 | 河南师范大学 | TiO2-CaTaO2N composite photocatalyst and preparation method thereof |
| CN103611560B (en) * | 2013-12-05 | 2015-06-03 | 河南师范大学 | TiO2-CaTaO2N composite photocatalyst and preparation method thereof |
| CN103599807B (en) * | 2013-12-05 | 2016-03-16 | 河南师范大学 | A kind of TiO 2-BaTaO 2n composite photo-catalyst and preparation method thereof |
| CN103962185A (en) * | 2014-05-15 | 2014-08-06 | 北京化工大学 | Method for synthesizing phosphotungstic acid-titanium dioxide composite spherical nanometer material by one-step sol-gel method |
| CN104525262A (en) * | 2014-12-29 | 2015-04-22 | 辽宁石油化工大学 | Preparation method of phosphotungstic acid and carbon nitride composite photocatalyst |
| CN109046411B (en) * | 2018-10-16 | 2021-05-14 | 九江学院 | Visible light response high-activity TiO2Preparation method of composite photocatalyst |
| CN109046411A (en) * | 2018-10-16 | 2018-12-21 | 九江学院 | A kind of visible light-responded high activity TiO2The preparation method of composite photo-catalyst |
| CN109967122A (en) * | 2019-04-11 | 2019-07-05 | 东北师范大学 | Immobilized AlCl_3 catalyst and the preparation method and application thereof |
| CN110252403A (en) * | 2019-06-18 | 2019-09-20 | 重庆化工职业学院 | A kind of composite photocatalyst material and its preparation method and application |
| CN110813339A (en) * | 2019-11-29 | 2020-02-21 | 吉林师范大学 | Defect heteropoly blue/TiO2Preparation method of composite visible light synthetic ammonia catalyst |
| CN111659429A (en) * | 2020-06-17 | 2020-09-15 | 宁波大学 | Preparation method of cadmium sulfide-cesium phosphotungstate composite material and application of composite material as visible-light-driven photocatalyst to hydrogen preparation |
| CN111659429B (en) * | 2020-06-17 | 2022-11-25 | 宁波大学 | Preparation method of cadmium sulfide-cesium phosphotungstate composite material and application of composite material as visible-light-driven photocatalyst to hydrogen preparation |
| CN112958123A (en) * | 2021-01-26 | 2021-06-15 | 浙江洲钜科技有限公司 | Composite photocatalyst and preparation method and application thereof |
| CN112958123B (en) * | 2021-01-26 | 2023-06-23 | 浙江洲钜科技有限公司 | Composite photocatalyst, preparation method and application thereof |
| CN114452988A (en) * | 2021-12-31 | 2022-05-10 | 中国石油天然气股份有限公司 | Supported heteropoly acid nano catalyst and preparation method thereof, and preparation method of aryl methyl stearate |
| CN114452988B (en) * | 2021-12-31 | 2024-06-11 | 中国石油天然气股份有限公司 | Supported heteropolyacid nano catalyst and preparation method thereof and preparation method of aryl methyl stearate |
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Application publication date: 20121003 |