CN1150979C - Nano Compound photocatalyst for cleaning air and its preparation method - Google Patents
Nano Compound photocatalyst for cleaning air and its preparation method Download PDFInfo
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- CN1150979C CN1150979C CNB021122660A CN02112266A CN1150979C CN 1150979 C CN1150979 C CN 1150979C CN B021122660 A CNB021122660 A CN B021122660A CN 02112266 A CN02112266 A CN 02112266A CN 1150979 C CN1150979 C CN 1150979C
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Abstract
The present invention relates to a nanometer composite photocatalyst used for purifying air and a preparation method thereof, which belongs to the nanometer technical field. The photocatalyst of the present invention is composed of carriers and nanometer particles or films, wherein the carriers are composed of spherical silica gel, or powder silica gel, or hollow silica gel or / and macroporous silica gel, or mesoporous silica gel; the hole diameter of the silica gel used for a gelatin-collosol technology method is from 5 to 30 nm, the hole diameter of the silica gel used for a slurry steeping technology method is larger than 30 nm, and the weight percentage of nanometer TiO2 photocatalysts is from 1.0 to 5.0%. Catalytic activity bodies of the photocatalyst of the present invention use the slurry steeping technology and the gelatin-collosol technology to load nanometer TiO2 particles or films on the surfaces of the carriers and gaps to form the nanometer composite photocatalyst. The present invention enhances the photocatalytic activity, realizes the fixation and high specific surface areas of nanometer particles and films, has simple technologies. Catalysts which are fixed by wire meshes and an ultraviolet lamp form a catalytic reactor to eliminate harmful gases such as formaldehyde, benzene series, etc., sealed indoors; the eliminating rate is larger than 80%.
Description
Technical field
What the present invention relates to is a kind of nano composite photo-catalyst, particularly a kind of nano compound photocatalyst for cleaning air and preparation method thereof, belongs to field of nanometer technology.
Background technology
In the modern residential environment, because the release of the harmful organic substance (as formaldehyde, benzene series thing etc.) that contains in the synthesized wood material, coating and the various ornament materials that use, and the rot ammonia that produces, hydrogen sulfide etc. of organic matters such as meat, egg products, vegetable dish become human " invisible killer ", the health that is just threatening people.Therefore, the purification of indoor environment has become the task of top priority.The air purifier that uses both at home and abroad mainly adopts charcoal absorption technology, ozone purification technology, anion dedusting technology and high voltage electrostatic technique at present.The charcoal absorption technology can only store nuisance absorption, and can not be with its decomposition or removal.Therefore in case adsorb saturatedly, need to change sorbing material, and finally do not eliminate harmful substance, just pollution sources are shifted.Ozone technology has sterilization, deodorization, but low to the removal efficient of organic pollution.It should be noted that more ozone itself is harmful to human body and environment.Anion and high voltage electrostatic technique are a kind of physical action processes, can remove airborne flue dust, but can't remove purification to the pollution that chemistry, biology and microorganism etc. are caused.Air purifying process as a new generation---photocatalysis technology is a eighties ability new developing technology in last century.Find that by literature search Chinese patent application number is: 00129180.7, name is called: a kind of photochemical catalyst that purifies air, this patented technology disclose a kind of photochemical catalyst that is used to purify air, at TiO
2Supporting Pt, V, Ni etc. have improved photocatalysis efficiency on the powder.But,, and also can't solve the agglomeration traits of nano particle with the actual use of the Powdered photochemical catalyst that exists difficulty.
Summary of the invention
The present invention is directed to the deficiencies in the prior art and defective, a kind of nano compound photocatalyst for cleaning air and preparation method thereof is provided, solved the dispersiveness and the immobilization of nano-photocatalyst, made the air cleaning photocatalysis have practical, the high absorption of agent, advantage of high activity.Photochemical catalyst of the present invention is made up of carrier and nano particle or film, and carrier is a silica gel, and the silica gel aperture that wherein is used for gel-collosol craft method is the 5-30 nanometer, and the silica gel aperture that is used for slurry impregnation technology method is greater than 30 nanometers, wherein TiO
2The nano-photocatalyst percentage by weight is 1.0-5.0%.
Catalytic activity body in the photochemical catalyst of the present invention adopts slurry dipping, gel-collosol craft with TiO
2Nano particle or film are carried in carrier surface and the space, form the composite nano photochemical catalyst.
Slurry impregnation technology method is specific as follows:
(1) it is standby that KSG places 50-150 ℃ of drying box inner drying;
(2) take by weighing TiO
2Nano-photocatalyst, particle diameter is dissolved in the distilled water less than the powder of 30 nanometers, and disperses under the ultrasonic wave effect;
(3) after abundant the dispersion, the KSG in the drying box is put into TiO
2Flood TiO in the slurry
2Nano particle fully enters inside, carrier space and is attached to the surface;
(4) filtration is back descended dry 2-10 hour at 80-150 ℃, promptly prepared the TiO of slurry infusion process
2Nano composite photo-catalyst.
Colloidal sol-gel process method is specific as follows:
(1) water content is that the silica gel of 2-5% is put into colloidal sol and flooded, treat that a certain amount of colloidal sol sucks in the silica-gel carrier hole after, lentamente silica gel is taken out airing from colloidal sol;
(2) insert in the electric furnace, slowly heat up, be incubated after 0.5-3 hour, slowly be cooled to again below 50 ℃, just obtain the composite catalyst finished product after the taking-up until 450-650 ℃.
Composite photo-catalyst is fixedly made the light-catalyzed reaction sheet by woven wire, is arranged in the light-catalyzed reaction cavity.That slurry impregnation technology method is used is TiO
2The nano-photocatalyst powder, that colloidal sol-gel process method is used is TiO
2Colloidal sol.
Composite photo-catalyst of the present invention makes TiO with butyl titanate, isopropyl titanate etc. as presoma
2Colloidal sol, the percentage by weight of butyl titanate system is: butyl titanate 19.0-25.0%, diethanol amine 3.5-6.5%, absolute ethyl alcohol 67.0-79.0%, distilled water 0-5.0%; The percentage by weight of isopropyl titanate system is: isopropyl titanate 15.0-23.0%, diethanol amine 3.0-9.0%, isopropyl alcohol 56.0-76.0%, distilled water 0-5.0%.
The basic principle that airborne nuisance is removed in photocatalysis is: the energy gap (E that is equal to or greater than semi-conducting material when its light quantum energy (hv)
g) illumination when being mapped to semiconductor light-catalyst, in conduction band, form a free electron simultaneously, in valence band, form an electronics hole.If this electronics-hole to can effectively be separated and localization when some position of catalyst surface, then oxidation or reduction are adsorbed on pernicious gas molecule on the catalyst surface effectively, and are translated into the diverse innocuous substance of chemical property.General organic nuisance can both be converted into innocuous substances such as water and carbon dioxide.
The present invention has substantive distinguishing features and marked improvement, and the nano composite photo-catalyst that the present invention obtained not only organic nuisance such as PARA FORMALDEHYDE PRILLS(91,95), benzene series thing has good degradation, and can be used for air cleaning, sterilization, sterilization.The inventive method as catalyst carrier, has nano level pore with Bio-sil, and specific area is big, and adsorptivity is strong, helps the photocatalytic nanometer dispersion of nano-particles and fixes, and improves photocatalytic activity; This nano composite photo-catalyst can effectively be removed organic nuisance, sterilization, elimination peculiar smell, purify air, and does not have any secondary pollution; Bio-sil is as catalyst carrier, and is with low cost, easy to use; Photochemical catalyst preparation technology is simple, good reproducibility; The photochemical catalyst convenient fixing, gas-premeable is good; This percentage by weight and technology have overcome silica gel and have met the problem that water ftractures, thereby make silica gel can become the good carrier of photochemical catalyst, the immobilization and the high-specific surface areaization of nano particle and film have been realized, this catalyst is fixed with woven wire, and form catalytic reactor with uviol lamp, pernicious gases such as the formaldehyde in the sealing chamber, benzene series row can be eliminated, its clearance is greater than 80%.
The specific embodiment
Provide following three embodiment in conjunction with content of the present invention:
Embodiment 1:(slurry impregnation technology method) presses mass ratio TiO
2: H
2O=10: 250 preparation TiO
2Emulsion adds about 100 gram water in small beaker, add 10 gram TiO again
2(P-25), in ultrasonic wave, stir, to promote its emulsification, being aided with little spoon simultaneously stirs under manpower in case TiO2 rolls into a ball precipitation at the cup bear building-up, transferred in large beaker on magnetic stirring apparatus stir about again 30 minutes, with Kiselgel A be placed in the insulating box in 180 ℃ dry 3 hours down, pour TiO then while hot into
2In the emulsion, allow it soak about 30 minutes (under the situation of magnetic agitation), take out soaked silica gel, make it in air, dry in the air to pour into then in 5 minutes and promptly make required catalysis material in the enamel tray, the TiO in the nano composite photocatalytic material that so makes
2(P-25) percentage by weight is about 3.5%.
Embodiment 2:(gel-sol process) measures the butyl titanate of 34.04ml and the diethanol amine of 9.6ml mixes in small beaker, under the magnetic agitation effect, said mixture adding slowly is equipped with in the large beaker of 134.56ml absolute ethyl alcohol, added the back stir about 2 hours and then the mixture of adding 20ml absolute ethyl alcohol and 1.8ml distilled water, stir and promptly made stand-by colloidal sol in 0.5 hour, the dried silica gel of certain moisture content is put into above-mentioned colloidal sol to be flooded, filter is done, pour in the enamel tray again and dry naturally, above-mentioned silica gel is put into high temperature furnace, under the condition of oxidizing atmosphere, slowly be warming up to 250 ℃ of insulations 15 minutes from room temperature, and then slowly be warming up to 550 ℃ the insulation 2 hours, through then burning till required catalysis material, the TiO in the catalysis material of gained after the cooling naturally
2Percentage by weight is about 3.2%.
Embodiment 3:(gel-sol process) measures the isopropyl titanate of 39ml and the diethanol amine of 12.5ml mixes in small beaker, under the magnetic agitation effect, said mixture adding slowly is equipped with in the large beaker of 86ml isopropyl alcohol, added the back stir about 2 hours and then the mixture of adding 108ml isopropyl alcohol and 4.5ml distilled water, stir and promptly make stand-by colloidal sol after 0.5 hour, the dried silica gel of certain moisture content is put into above-mentioned colloidal sol to be flooded, filter is done, pour in the enamel tray again and dry naturally, above-mentioned silica gel is put into high temperature furnace, under the condition of oxidizing atmosphere, slowly be warming up to 250 ℃ of insulations 15 minutes from room temperature, and then slowly be warming up to 520 ℃ the insulation 2 hours, through then burning till required catalysis material, the TiO in the catalysis material of gained after the cooling naturally
2Percentage by weight is about 3.5%.
Claims (3)
1, a kind of nano compound photocatalyst for cleaning air is characterized in that, carrier is a silica gel, and the silica gel aperture that wherein is used for gel-collosol craft method is the 5-30 nanometer, and the silica gel aperture that is used for slurry impregnation technology method is greater than 30 nanometers, wherein TiO
2The nano-photocatalyst percentage by weight is 1.0-5.0%.
2, this nano compound photocatalyst for cleaning air according to claim 1 is characterized in that making TiO with butyl titanate, isopropyl titanate as presoma
2Colloidal sol, the percentage by weight of butyl titanate system is: butyl titanate 19.0-25.0%, diethanol amine 3.5-6.5%, absolute ethyl alcohol 67.0-79.0%, distilled water 0-5.0%; The percentage by weight of isopropyl titanate system is: isopropyl titanate 15.0-23.0%, diethanol amine 3.0-9.0%, isopropyl alcohol 56.0-76.0%, distilled water 0-5.0%.
3, a kind of preparation method of nano compound photocatalyst for cleaning air is characterized in that, the catalytic activity body in the photochemical catalyst adopts slurry impregnation technology method, gel-collosol craft method with TiO
2Nano particle or film are carried in carrier surface and the space, form the composite nano photochemical catalyst, the silica gel aperture that is used for gel-collosol craft method is the 5-30 nanometer, colloidal sol-gel process method is specific as follows: (1) water content is that the silica gel of 2-5% is put into colloidal sol and flooded, after treating that a certain amount of colloidal sol sucks in the silica-gel carrier hole, lentamente silica gel is taken out airing from colloidal sol; (2) insert in the electric furnace, slowly heat up, be incubated after 0.5-3 hour, slowly be cooled to again below 50 ℃, just obtain the composite catalyst finished product after the taking-up until 450-650 ℃; And the silica gel aperture that is used for slurry impregnation technology method is greater than 30 nanometers, and slurry impregnation technology method is specific as follows: (1) KSG places 50-150 ℃ of drying box inner drying standby; (2) take by weighing TiO
2Nano-photocatalyst, particle diameter are dissolved in the distilled water less than the powder of 30 nanometers, disperse under the ultrasonic wave effect; (3) after abundant the dispersion, KSG in the drying box is put into TiO
2Flood TiO in the slurry
2Nano particle fully enters inside, carrier space and is attached to the surface; (4) filtration is back descended dry 2-10 hour at 80-150 ℃, promptly prepared the TiO of slurry infusion process
2Nano composite photo-catalyst, wherein TiO
2The nano-photocatalyst percentage by weight is 1.0-5.0%,
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021122660A CN1150979C (en) | 2002-06-27 | 2002-06-27 | Nano Compound photocatalyst for cleaning air and its preparation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021122660A CN1150979C (en) | 2002-06-27 | 2002-06-27 | Nano Compound photocatalyst for cleaning air and its preparation method |
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| CN1394674A CN1394674A (en) | 2003-02-05 |
| CN1150979C true CN1150979C (en) | 2004-05-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100374185C (en) * | 2005-10-21 | 2008-03-12 | 中国科学院广州地球化学研究所 | Purifying method and apparatus for air with low concentration organic pollutant |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100348312C (en) * | 2005-12-27 | 2007-11-14 | 四川大学 | Loaded type TiO2 photocatalyst using luminescent material as carrier, prepn. method and application thereof |
| CN100444952C (en) * | 2006-04-30 | 2008-12-24 | 天津南开戈德集团有限公司 | Supported nanometer crystalline titania photocatalyst and its prepn process |
| CN100446855C (en) * | 2007-06-26 | 2008-12-31 | 福州大学 | Method for in-situ synthesizing and synchronized loading composite semiconductor light-catalyst ZnO and ZnS |
| CN101537311B (en) * | 2009-04-27 | 2011-03-16 | 广州环发环保工程有限公司 | Biological purification method for light-concentration volatile mixed organic exhaust gas |
| CN101716499B (en) * | 2009-11-27 | 2011-12-14 | 中国科学院广州地球化学研究所 | Mesoporous silica gel loading titanium pillared clay photocatalyst, preparation method and application thereof |
| CN104226092A (en) * | 2013-06-09 | 2014-12-24 | 白瑛 | Application of silica gel as air purifying and drying agent |
| CN105849205B (en) * | 2013-12-18 | 2017-10-24 | 三菱电机株式会社 | Hydrophilic film and its manufacture method, humidifying element and humidification device |
| CN104941578A (en) * | 2015-05-26 | 2015-09-30 | 漳州市宇诚新型材料有限公司 | Silica-gel composite particles for purification and preparation method thereof |
| CN106268300A (en) * | 2016-08-26 | 2017-01-04 | 吴伟堂 | A kind of preparation method of air purifying preparation |
| CN107899421A (en) * | 2017-12-13 | 2018-04-13 | 深圳市格绿丝纳米科技有限公司 | A kind of photocatalysis air-cleaning filter core module processing technology |
| CN108246276B (en) * | 2018-03-06 | 2020-11-03 | 长沙理工大学 | Preparation method of millimeter-scale metal oxide ball |
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2002
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100374185C (en) * | 2005-10-21 | 2008-03-12 | 中国科学院广州地球化学研究所 | Purifying method and apparatus for air with low concentration organic pollutant |
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| CN1394674A (en) | 2003-02-05 |
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