CN1772348A - Purifying method and apparatus for air with low concentration organic pollutant - Google Patents
Purifying method and apparatus for air with low concentration organic pollutant Download PDFInfo
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- CN1772348A CN1772348A CN 200510100519 CN200510100519A CN1772348A CN 1772348 A CN1772348 A CN 1772348A CN 200510100519 CN200510100519 CN 200510100519 CN 200510100519 A CN200510100519 A CN 200510100519A CN 1772348 A CN1772348 A CN 1772348A
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Abstract
The purifying method of air with low concentration organic pollutant includes the following steps: making the air with low concentration organic pollutant flow through fluidized bed with photocatalyst in the flow rate of 0.15-1.5 cu m/hr for 1-4 hr to make the supported photocatalyst in ''boiling'' state under the action of the air flow; and irradiating the fluidized bed with ultraviolet ray to make the organic pollutant adsorbed to the surface of the catalyst produce photocatalytic reaction for degradation and elimination. The corresponding purifying apparatus is also provided. The purifying method has high treating efficiency and is simple and fast, and the purifying apparatus has full contact between the photocatalyst and the reactant, high light quantum efficiency, high gaseous organic matter degrading efficiency and easy loading and unloading of the photocatalyst.
Description
Technical field
The present invention relates to the air purifying process field, specifically be meant the purification method and the purifier thereof of light concentration organic pollutant in a kind of air.
Background technology
Along with the expansion day by day of human production activity's scope, cause having occurred more and more serious environmental pollution.Particularly VOC is very serious to the pollution of environment, is present in widely in water body, soil and the air.These VOC great majority are poisonous to human body, can also destroy atmospheric ozone layer by photochemical reaction, and atmospheric environment and health are produced serious negative effect.Wherein, carbonyls is the main volatile organic contaminant of a class, and Low-Molecular-Weight Carbonyl Compounds such as formaldehyde, acetaldehyde are indoor major pollutants, and is very big to the human body murder by poisoning, and is considered to have carcinogenesis.
At present, the organic pollution during people are studying and purifying air by photocatalytic degradation.But in the gas-solid phase photocatalytic degradation of light-concentration volatile organic compound, because the organic compound substrate concentration is lower usually in the gas phase, thereby degradation reaction thing and photochemical catalyst touch opportunity are less, the inefficiency that causes photocatalytic degradation, when organic compound substrate concentration in the gas phase low to a certain degree the time even can not effectively degrade, thereby make light concentration organic pollutant purify the very long reaction time of needs fully.Therefore, really realize effective photocatalytic degradation of the toxic volatile organic compound of typical indoor pollution concentration level, must guarantee that the organic pollution of degraded has sufficient the contact with photochemical catalyst.For this reason, the existing at present research first step is by adsorbent elder generation absorption concentrating low-concentration gas phase organic compound, second step is again by desorb then, the 3rd step photocatalysis degradation organic contaminant under high concentration, eliminate the toxic organics of low concentration in the air to reach degraded, yet this technology is operated loaded down with trivial details complexity, and the cost of group technology is relatively also very big, therefore is not suitable for practical application.In addition, for gas-solid phase light-catalyzed reaction, effectively the light-catalyzed reaction space should exist light, reaction substrate and photochemical catalyst simultaneously.That is to say that the distribution of light in whole reactor is even more good more, because be not invalid by the catalyst of light irradiation, and when local photochemical catalyst during by excessive irradiation, also only be to have small part luminous energy finally to cause light-catalyzed reaction, most of luminous energy then loses with forms such as heat radiations, thereby causes photo-quantum efficiency very low.
Summary of the invention
Purpose of the present invention is exactly in order to solve above-mentioned the deficiencies in the prior art part, and the purification method and the purifier thereof of light concentration organic pollutant in a kind of air is provided.This purification method treatment effeciency height is implemented simple and convenient; Light, catalyst, reactant can fully contact in this purifier, have improved photo-quantum efficiency greatly, make the gas phase organic matters photocatalytic degradation have higher efficient, and the easier regeneration charge and discharge operations that carries out photochemical catalyst.
Purpose of the present invention is achieved through the following technical solutions: the purification method of light concentration organic pollutant comprises the steps and process conditions in described a kind of air: the air that will contain low-concentration organic is by 0.15～1.5m
3The flow velocity of/h cycled through the photochemical catalyst thermopnore 1～4 hour, and under the effect of air-flow, loaded photocatalyst is in " boiling " state; Open UV-irradiation to thermopnore simultaneously, airborne organic pollution is adsorbed on catalyst surface and carries out light-catalyzed reaction, and along with air constantly circulates, light-catalyzed reaction circulation is continuously carried out, thereby organic pollutant degradation is eliminated.
In order to realize the present invention better, described airborne content of organics is 60～600ppb; Described organic matter comprises carbonyls, and described carbonyls comprises one or more mixtures in formaldehyde, acetaldehyde, propionic aldehyde or the acetone; Described air humidity scope is 4～13.5mg/m
3, the oxygen concentration scope is 5～80%; Described loaded photocatalyst comprises TiO
2/ SiO
2Loaded photocatalyst or TiO
2/ clay/SiO
2Composite load type photochemical catalyst; Described photochemical catalyst specific surface area size is 300～800m
2/ g, load capacity is 2～15%; Described UV-irradiation dominant wavelength is 365 nanometers.
Described TiO
2/ SiO
2Loaded photocatalyst is prepared from by following method:
The first step is added drop-wise to butyl titanate in the acetum of vigorous stirring, obtain butyl titanate: acetic acid: hydromassage you than counting 1: 5～20: 30～50 white slurry, continue stirring and obtain vitreosol, after this colloidal sol is continued to stir 2～4 hours, obtain translucent gels solution;
Second step was carried out the dipping coating 2～10 times with silica gel in above-mentioned translucent gels solution, flood coating at every turn after, silica gel 70～90 ℃ of down oven dry 1～2 hour, is obtained the photochemical catalyst presoma, described silica gel and TiO
2Mass ratio be 85～98: 2～15;
The 3rd step calcined the photochemical catalyst presoma 2～8 hours down in 300～650 ℃, promptly got described TiO
2/ SiO
2Loaded photocatalyst.
Described TiO
2/ clay/SiO
2Composite load type photochemical catalyst is prepared from by following method:
The first step is added drop-wise to butyl titanate in the acetum of vigorous stirring, obtain butyl titanate: acetic acid: hydromassage you than counting 1: 5～20: 30～50 white slurry, stir after 2～4 hours, fully clay (the 200 order montmorillonite) aaerosol solution of swelling 0.1～20% after 12～36 hours adding in advance under intense stirring condition, continue to stir and obtain mixed sols, this colloidal sol is continued stirring after 2～4 hours, obtain mixed gel solution;
Second step was carried out the dipping coating 2～10 times with silica gel in above-mentioned mixed gel solution, flood coating at every turn after, silica gel 70～90 ℃ of down oven dry 1～2 hour, is obtained the photochemical catalyst presoma, described silica gel and TiO
2The mass ratio of/clay is 85～98: 2～15;
The 3rd step calcined the photochemical catalyst presoma 2～8 hours down in 300～650 ℃, promptly got described TiO
2/ clay/SiO
2Composite load type photochemical catalyst.
TiO
2Because existing higher photocatalytic activity, have anti-photoetch again, and cheap, be easy to get, under acid-base condition, stablize indissoluble and the advantage of giving prominence to such as nontoxic and be widely studied.But present domestic widely used TiO
2The nano powder photochemical catalyst is (as commercial P25 TiO
2) come with some shortcomings, for example, in use, existence is easily assembled and is difficult to separation and recovery etc., and these problems have all limited TiO
2Application development.In addition, because the organic contamination substrate concentration is generally very low in the air, directly use TiO
2Catalytic efficiency is also lower during nano powder.The present invention selects the enriching pollutants of the suitable carrier silica gel with absorption property with these low concentrations, for photochemical catalyst provides the catalytic environment of a higher concentration, thereby helps improving the catalytic efficiency of light concentration organic pollutant in the air.Among the above-mentioned preparation method, adopting silica gel is the penetrability that does not influence ultraviolet light because ultraviolet light can penetrate silica gel as carrier, and Bio-sil has bigger specific area and stronger absorption property, chooses the immobilized back of suitable particle diameter and have good mobility in flowing bed reactor.And replace the HCl or the HNO that use always with acetic acid during collosol and gel in preparation
3Has certain advantage.In acetic aid medium, the butyl titanate hydrolysis rate is slow, and condition is controlled easily, has generated polymer in system, as Ti (OH)
x(OAC)
y, Ti (OC
4H
9)
x(OAC)
y, Ti
nO
2n-(x+y)/ 2 (OH)
x(OC
4H
9)
yDeng, can form the gel of stable homogeneous.
Gas-solid mutually light urge in the degradation reaction, the flow velocity of reacting gas has significant effects to photocatalytic degradation reaction.Experiment finds that formaldehyde and acetaldehyde are subjected to the influence of flow velocity similar, and propionic aldehyde and acetone are subjected to the influence of flow velocity similar, at 0.15～1.5m
3The degraded clearance is better in the/h scope, but when flow velocity exceeded above-mentioned scope, the degraded clearance of four kinds of compounds all significantly reduced.
According to the out-phase photocatalysis principle, the existence of moisture also has material impact to light-catalyzed reaction.Experiment is found, at 4～13.5mg/m
3In the scope, the degraded clearance of reactant is comparatively stable; Exceed this scope,, cause photocatalytic degradation efficient to reduce then because hydrone surrogate response thing molecule occupies the surface-active point of catalyst.
According to the out-phase photocatalysis principle, oxygen is as a kind of reactant and light induced electron trapping agent, and is essential in the out-phase light-catalyzed reaction, and light-catalyzed reaction is had significant effects.Experiment finds that when oxygen content was zero, the photocatalytic degradation efficient of four kinds of carbonyls was very low, and when oxygen content reached 5%, photocatalytic degradation efficient improved greatly, but when oxygen concentration surpassed 80%, photocatalytic degradation efficient was influenced by oxygen concentration hardly.
Organic purifier is a kind of bed photocatalytic reactor that circulates continuously in described a kind of air, adopt three layers of cylindrical reactor, innermost layer is quartzy U type pipe, described quartzy U type inner coaxial tube is placed the light source uviol lamp, be provided with cooling water jecket between skin and the middle level, be the mobile bed of photochemical catalyst between described quartzy U type pipe and the middle level, the bottom of described reactor has the gas access, the top has gas vent, the cooling water inlet is arranged at the bottom of reactor, coolant outlet is arranged at the top of reactor, bottom at the mobile bed of described photochemical catalyst is fixed with the porous core, its upper support has loaded photocatalyst, is fixed with glass layer on the top of the mobile bed of photochemical catalyst.
Described U type pipe adopting quartz glass pipe, ordinary rigid glass is adopted in outer and middle level.
The present invention compared with prior art has the following advantages and beneficial effect:
1, in purifier of the present invention, light, catalyst, reactant can fully contact, and have improved photo-quantum efficiency greatly, make low concentration gas phase organic matters photocatalytic degradation have higher efficient; And circulate the easier charge and discharge operations that carries out photochemical catalyst of bed bioreactor continuously, make catalyst regeneration process more convenient.
2, purification method of the present invention and purifier can be degraded to non-toxic compound simultaneously with airborne multiple light concentration organic pollutant.
3, the present invention is with high-activity nano TiO
2Perhaps nano-TiO
2/ clay and high adsorption carrier silica gel SiO
2Organically combine, prepare the photochemical catalyst of high activity, high adsorption, in the photocatalytic degradation process, make original position adsorption and enrichment one side, organic compound one side original position photocatalytic degradation of low concentration, make the continuous in-situ regeneration of photochemical catalyst of adsorption and enrichment organic pollution, therefore not only simplify operation, and improved the efficient of photocatalysis service life and photocatalytic degradation greatly.
Description of drawings
Fig. 1 is the structural representation of organic purifier in a kind of air of the present invention;
Fig. 2 is TiO
2The X-ray diffraction of nano-powder is analyzed collection of illustrative plates;
Fig. 3 is silica gel and nano-TiO
2The electromicroscopic photograph of/silica-gel catalyst;
Fig. 4 is the concentration of mixing carbonyls and the graph of a relation of light application time.
The specific embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing, but embodiments of the present invention are not limited thereto.
As shown in Figure 1, the purifier of light concentration organic pollutant is a kind of bed photocatalytic reactor that circulates continuously in a kind of air of the present invention, adopt three layers of column glass reactor, innermost layer is a U type quartz glass tube 1, outer and middle level is an ordinary rigid glass, coaxial placement light source uviol lamp 7 in U type quartz glass tube 1, interlayer between skin and the middle level is a cooling water jecket 4, space between U type quartz glass tube 1 and the middle level is the mobile bed 5 of photochemical catalyst, the bottom of the reactor gas inlet 8 that responds, the top gas outlet 2 that responds, cooling water inlet 6 is arranged at the bottom of reactor, coolant outlet 10 is arranged at the top of reactor, a porous core 9 has been fixed in bottom at the mobile bed 5 of photochemical catalyst, supports loaded photocatalyst, has fixed layer of glass layer 3 on the top of the mobile bed 5 of photochemical catalyst, to prevent that loaded photocatalyst from flowing out with air-flow, reaction air circulation ground repeatedly contacts light-catalyzed reaction by the photochemical catalyst thermopnore.Loaded photocatalyst can adopt TiO
2/ SiO
2Loaded photocatalyst or TiO
2/ clay/SiO
2Composite load type photochemical catalyst.
TiO
2/ SiO
2Composite load type photochemical catalyst is prepared from by following method:
The first step is added drop-wise to butyl titanate in the acetum of vigorous stirring, obtain butyl titanate: acetic acid: the hydromassage that is than the white slurry of counting 1: 5: 30, continue stirring and obtain vitreosol, after this colloidal sol is continued to stir 2 hours, obtain translucent gels solution;
Second step (washed a certain amount of silica gel through rare nitric acid treatment and distilled water, and under 120 ℃, carried out 2 hours dryings) add and carry out the dipping coating in the above-mentioned translucent gels solution 2 times, behind each dipping coating, silica gel was dried 2 hours down at 70 ℃, obtain the photochemical catalyst presoma;
The 3rd step calcined the photochemical catalyst presoma 4 hours down in 450 ℃, promptly got described TiO
2/ SiO
2Loaded photocatalyst (load capacity of catalyst is 15%, and then corresponding load silica gel is 85%).
TiO
2/ SiO
2Composite load type photochemical catalyst is prepared from by following method:
The first step is added drop-wise to butyl titanate in the acetum of vigorous stirring, obtain butyl titanate: acetic acid: the hydromassage that is than the white slurry of counting 1: 10: 40, continue stirring and obtain vitreosol, after this colloidal sol is continued to stir 3 hours, obtain translucent gels solution;
Second step (washed a certain amount of silica gel through rare nitric acid treatment and distilled water, and under 120 ℃, carried out 2 hours dryings) add and carry out the dipping coating in the above-mentioned translucent gels solution 5 times, behind each dipping coating, silica gel was dried 1.5 hours down at 80 ℃, obtain the photochemical catalyst presoma;
The 3rd step calcined the photochemical catalyst presoma 8 hours down in 300 ℃, promptly got described TiO
2/ SiO
2Loaded photocatalyst (load capacity of catalyst is 10%, and then corresponding load silica gel is 90%).
TiO
2/ SiO
2Composite load type photochemical catalyst is prepared from by following method:
The first step is added drop-wise to butyl titanate in the acetum of vigorous stirring, obtain butyl titanate: acetic acid: the hydromassage that is than the white slurry of counting 1: 20: 50, continue stirring and obtain vitreosol, after this colloidal sol is continued to stir 4 hours, obtain translucent gels solution;
Second step (washed a certain amount of silica gel through rare nitric acid treatment and distilled water, and under 120 ℃, carried out 2 hours dryings) add and carry out the dipping coating in the above-mentioned translucent gels solution 10 times, behind each dipping coating, silica gel was dried 1 hour down at 90 ℃, obtain the photochemical catalyst presoma;
The 3rd step calcined the photochemical catalyst presoma 2 hours down in 650 ℃, promptly got described TiO
2/ SiO
2Loaded photocatalyst (load capacity of catalyst is 2%, and then corresponding load silica gel is 98%).
As shown in Figure 2, the TiO that the present invention is prepared
2Nanometer powder carries out the X-ray diffraction analysis.The TiO of the present invention's preparation
2Belong to Detitanium-ore-type, calculate TiO according to the Scherrer formula
2Average grain diameter be 15.1nm.As shown in Figure 3, for understanding the configuration of surface and the nano-TiO of silica gel
2The area load state of/silica gel utilizes surface and the nano-TiO of SEM to silica gel
2Surface before and after the reaction of/silica-gel catalyst is observed.The surface of silica gel is hackly (Fig. 3 a), but after the coating load, TiO
2Nano particle is coated on the surface of silica gel equably, and the surface of silica gel is by TiO
2Nano particle covers fully, does not almost have agglomeration, surface TiO
2The average particle size particle size of nano particle is (Fig. 3 b) about 10nm.As a comparison, the TiO under identical preparation condition and calcination condition, preparing
2Nanometer powder has also carried out sem observation, finds to have part to reunite, and particle size is big slightly during than load, about 17nm (Fig. 3 d), and the basically identical as a result of this and ESEM.The above results explanation is a carrier with silica gel, handles by load, has suppressed crystal growth, has reduced the reunion of nano particle, is evenly distributed, short grained nano-TiO
2Film.TiO before the reaction
2/ silica-gel catalyst and light-catalyzed reaction TiO after 48 hours
2The configuration of surface of/silica-gel catalyst (Fig. 3 c) does not almost have any variation.
With N
2Adopt the BET method for adsorbed gas and measured silica gel, TiO
2Nanometer powder and nano-TiO
2/ silica gel photochemical catalyst (TiO
2Load capacity is 4.7%) specific area, measurement result is: silica gel, TiO
2Nano-TiO before nanometer powder, the reaction
2/ silica gel photochemical catalyst and light-catalyzed reaction TiO after 48 hours
2The specific area of/silica-gel catalyst is respectively 389m
2/ g, 82m
2/ g, 353m
2/ g and 343m
2/ g.Presentation of results, silica gel by the load coating after, specific area has reduced a bit slightly, may be because silica gel on the part nanometer micropore by nano-TiO
2Block or covering.In addition, the loaded photocatalyst that makes in the present invention has bigger specific area equally, and changes not quite before and after the reaction, and the specific area of loaded photocatalyst compares TiO
2Nanometer powder is much bigger, so loaded catalyst all has good adsorption property.
TiO
2/ clay/SiO
2Composite load type photochemical catalyst is prepared from by following method:
The first step is added drop-wise to butyl titanate in the acetum of vigorous stirring, obtain butyl titanate: acetic acid: the hydromassage that is than the white slurry of counting 1: 15: 40, stir after 3 hours, fully clay (the 200 order montmorillonite) aaerosol solution of swelling 10% after 24 hours adding in advance under intense stirring condition, continue to stir and obtain mixed sols, this colloidal sol is continued stirring after 2 hours, obtain mixed gel solution;
Second step was carried out the dipping coating 6 times with silica gel in above-mentioned mixed gel solution, flood coating at every turn after, silica gel 80 ℃ of down oven dry 2 hours, is obtained the photochemical catalyst presoma, described silica gel and TiO
2The mass ratio of/clay is 90: 10;
The 3rd step calcined the photochemical catalyst presoma 5 hours down in 600 ℃, promptly got described TiO
2/ clay/SiO
2Composite load type photochemical catalyst.
TiO
2/ clay/SiO
2Composite load type photochemical catalyst is prepared from by following method:
The first step is added drop-wise to butyl titanate in the acetum of vigorous stirring, obtain butyl titanate: acetic acid: the hydromassage that is than the white slurry of counting 1: 5: 30, stir after 4 hours, fully clay (the 200 order montmorillonite) aaerosol solution of swelling 20% after 36 hours adding in advance under intense stirring condition, continue to stir and obtain mixed sols, this colloidal sol is continued stirring after 4 hours, obtain mixed gel solution;
Second step was carried out the dipping coating 10 times with silica gel in above-mentioned mixed gel solution, flood coating at every turn after, silica gel 90 ℃ of down oven dry 1 hour, is obtained the photochemical catalyst presoma, described silica gel and TiO
2The mass ratio of/clay is 98: 2;
The 3rd step calcined the photochemical catalyst presoma 8 hours down in 300 ℃, promptly got described TiO
2/ clay/SiO
2Composite load type photochemical catalyst.
Embodiment 7
TiO
2/ clay/SiO
2Composite load type photochemical catalyst is prepared from by following method:
The first step is added drop-wise to butyl titanate in the acetum of vigorous stirring, obtain butyl titanate: acetic acid: the hydromassage that is than the white slurry of counting 1: 20: 50, stir after 2 hours, fully clay (the 200 order montmorillonite) aaerosol solution of swelling 0.1% after 12 hours adding in advance under intense stirring condition, continue to stir and obtain mixed sols, this colloidal sol is continued stirring after 3 hours, obtain mixed gel solution;
Second step was carried out the dipping coating 2 times with silica gel in above-mentioned mixed gel solution, flood coating at every turn after, silica gel 70 ℃ of down oven dry 2 hours, is obtained the photochemical catalyst presoma, described silica gel and TiO
2The mass ratio of/clay is 85: 15;
The 3rd step calcined the photochemical catalyst presoma 2 hours down in 650 ℃, promptly got described TiO
2/ clay/SiO
2Composite load type photochemical catalyst.
Embodiment 8
Organic purification method comprises the steps and process conditions in the air:
The first step will contain the air of low concentration (60ppb) formaldehyde, and (air humidity is 4mg/m
3, oxygen concentration is 5%) and press 0.15m
3The flow velocity circulation of/h enters reactor by the inlet of reactor bottom, and (the photochemical catalyst bed is filled TiO by the mobile bed of photochemical catalyst
2/ SiO
2Loaded photocatalyst, loaded photocatalyst particle size are 20 orders, and the photochemical catalyst specific surface area size is 300m
2/ g, TiO
2Load capacity be 15%) reaction 1 hour, under the effect of air-flow, loaded photocatalyst is in " boiling " state;
Second step was opened the 365nm UV-irradiation to thermopnore simultaneously, and formaldehyde is at TiO
2/ SiO
2Light-catalyzed reaction is carried out on the loaded photocatalyst surface, and along with air constantly circulates, light-catalyzed reaction circulation is continuously carried out, and degradation rate reaches 100%.
Embodiment 9
Organic purification method comprises the steps and process conditions in the air:
The first step will contain the air of low concentration (600ppb) formaldehyde, acetaldehyde, propionic aldehyde and acetone, and (air humidity is 9.5mg/m
3, oxygen concentration is 80%) and press 1.5m
3The flow velocity circulation of/h enters reactor by the inlet of reactor bottom, and (the photochemical catalyst bed is filled TiO by the mobile bed of photochemical catalyst
2/ SiO
2Loaded photocatalyst, loaded photocatalyst particle size are 60 orders, and the photochemical catalyst specific surface area size is 600m
2/ g, TiO
2Load capacity be 10%) reaction 4 hours, under the effect of air-flow, loaded photocatalyst is in " boiling " state;
Second step was opened the 365nm UV-irradiation to thermopnore simultaneously, and formaldehyde, acetaldehyde, propionic aldehyde and acetone are at TiO
2/ SiO
2Light-catalyzed reaction is carried out on loaded photocatalyst agent surface, and along with air constantly circulates, light-catalyzed reaction circulation is continuously carried out, and degradation rate reaches 96%.
Organic purification method comprises the steps and process conditions in the air:
The first step will contain the air of low concentration (300ppb) formaldehyde and acetone, and (air humidity is 13.5mg/m
3, oxygen concentration is 30%) and press 0.5m
3The flow velocity circulation of/h enters reactor by the inlet of reactor bottom, and (the photochemical catalyst bed is filled TiO by the mobile bed of photochemical catalyst
2/ SiO
2Loaded photocatalyst, loaded photocatalyst particle size are 100 orders, and the photochemical catalyst specific surface area size is 800m
2/ g, TiO
2Load capacity be 2%) reaction 3 hours, under the effect of air-flow, loaded photocatalyst is in " boiling " state;
Second step was opened the 365nm UV-irradiation to thermopnore simultaneously, and formaldehyde and pyroracemic aldehyde are at TiO
2/ SiO
2Light-catalyzed reaction is carried out on the loaded photocatalyst surface, and along with air constantly circulates, light-catalyzed reaction circulation is continuously carried out, and degradation rate reaches 93%.
Comparing embodiment: the kinetics of photocatalytic degradation of mixing carbonyls
During experiment, 5g photochemical catalyst (TiO packs in purifier of the present invention
2/ clay/SiO
2Composite load type photochemical catalyst), inject the reactant mixture (containing formaldehyde, acetaldehyde, propionic aldehyde and acetone liquid reaction mixture) of 600ppm respectively from injection port, the photocatalytic degradation reaction is at air dielectric and humidity 0.4mg/m
3Carry out under the condition.The result of different light photocatalytic degradation during the time as shown in Figure 4, four kinds of carbonyls are all easily by photocatalytic degradation, and the easy degree of degrading is propionic aldehyde＞acetone＞acetaldehyde＞formaldehyde.Acetaldehyde and Degradation Formaldehyde clearance are all up to more than 80% in 2 hours light application times, and wherein acetone and propionic aldehyde are up to more than 99%.
Claims (10)
1, the purification method of light concentration organic pollutant in a kind of air, comprise the steps and process conditions: the air that will contain low-concentration organic is by 0.15～1.5m
3The flow velocity of/h cycled through the photochemical catalyst thermopnore 1～4 hour, and under the effect of air-flow, loaded photocatalyst is in " boiling " state; Open UV-irradiation to thermopnore simultaneously, airborne organic pollution is adsorbed on catalyst surface and carries out light-catalyzed reaction, and along with air constantly circulates, light-catalyzed reaction circulation is continuously carried out, and organic pollutant degradation is eliminated.
2, the purification method of light concentration organic pollutant in a kind of air according to claim 1 is characterized in that described airborne content of organics is 60～600ppb.
3, the purification method of light concentration organic pollutant in a kind of air according to claim 1, it is characterized in that, described organic matter comprises carbonyls, and described carbonyls comprises one or more mixtures in formaldehyde, acetaldehyde, propionic aldehyde or the acetone.
4, the purification method of light concentration organic pollutant in a kind of air according to claim 1 is characterized in that described air humidity scope is 4～13.5mg/m
3, the oxygen concentration scope is 5～80%.
5, the purification method of light concentration organic pollutant in a kind of air according to claim 1 is characterized in that described loaded photocatalyst comprises TiO
2/ SiO
2Loaded photocatalyst or TiO
2/ clay/SiO
2Composite load type photochemical catalyst, described loaded photocatalyst specific surface area size is 300～800m
2/ g, load capacity is 2～15%.
6, the purification method of light concentration organic pollutant in a kind of air according to claim 1 is characterized in that described UV-irradiation dominant wavelength is 365 nanometers.
7, the purification method of light concentration organic pollutant in a kind of air according to claim 5 is characterized in that described TiO
2/ SiO
2Loaded photocatalyst is prepared from by following method:
The first step is added drop-wise to butyl titanate in the acetum of vigorous stirring, obtain butyl titanate: acetic acid: hydromassage you than counting 1: 5～20: 30～50 white slurry, continue stirring and obtain vitreosol, after this colloidal sol is continued to stir 2～4 hours, obtain translucent gels solution;
Second step was carried out the dipping coating 2～10 times with silica gel in above-mentioned translucent gels solution, flood coating at every turn after, silica gel 70～90 ℃ of down oven dry 1～2 hour, is obtained the photochemical catalyst presoma, described silica gel and TiO
2Mass ratio be 85～98: 2～15;
The 3rd step calcined the photochemical catalyst presoma 2～8 hours down in 300～650 ℃, promptly got described TiO
2/ SiO
2Loaded photocatalyst.
8, the purification method of light concentration organic pollutant in a kind of air according to claim 5 is characterized in that described TiO
2/ clay/SiO
2Composite load type photochemical catalyst is prepared from by following method:
The first step is added drop-wise to butyl titanate in the acetum of vigorous stirring, obtain butyl titanate: acetic acid: hydromassage you than counting 1: 5～20: 30～50 white slurry, stir after 2～4 hours, the fully clay aaerosol solution of swelling 0.1～20% after 12～36 hours adding in advance under intense stirring condition, continue to stir and obtain mixed sols, this colloidal sol is continued stirring after 2～4 hours, obtain mixed gel solution;
Second step was carried out the dipping coating 2～10 times with silica gel in above-mentioned mixed gel solution, flood coating at every turn after, silica gel 70～90 ℃ of down oven dry 1～2 hour, is obtained the photochemical catalyst presoma, described silica gel and TiO
2The mass ratio of/clay is 85～98: 2～15;
The 3rd step calcined the photochemical catalyst presoma 2～8 hours down in 300～650 ℃, promptly got described TiO
2/ clay/SiO
2Composite load type photochemical catalyst.
9, the purifier of light concentration organic pollutant in a kind of air, it is characterized in that it being a kind of bed photocatalytic reactor that circulates continuously, adopt three layers of cylindrical reactor, innermost layer is quartzy U type pipe, described quartzy U type inner coaxial tube is placed the light source uviol lamp, be provided with cooling water jecket between skin and the middle level, be the mobile bed of photochemical catalyst between described quartzy U type pipe and the middle level, the bottom of described reactor has the gas access, the top has gas vent, the cooling water inlet is arranged at the bottom of reactor, coolant outlet is arranged at the top of reactor, bottom at the mobile bed of described photochemical catalyst is fixed with the porous core, and its upper support has loaded photocatalyst, is fixed with glass layer on the top of the mobile bed of photochemical catalyst.
10, the purifier of light concentration organic pollutant in a kind of air according to claim 9 is characterized in that, described U type pipe adopting quartz glass pipe, and ordinary rigid glass is adopted in outer and middle level.
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| CNB2005101005198A CN100374185C (en) | 2005-10-21 | 2005-10-21 | Purifying method and apparatus for air with low concentration organic pollutant |
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| CN102574705A (en) * | 2009-08-25 | 2012-07-11 | 法斯-施塔格迈尔有限责任公司 | Processes and uses of dissociating molecules |
| CN103453591A (en) * | 2013-08-14 | 2013-12-18 | 广西大学 | Photocatalytic fluidized bed air purifier |
| CN103868158A (en) * | 2014-03-18 | 2014-06-18 | 重庆大学 | Wall-mounted household high-efficiency photocatalysis air purifier |
| CN104014222A (en) * | 2014-06-19 | 2014-09-03 | 东北林业大学 | Sleeve-type adsorber and method for adsorbing and desorbing CO2 by utilizing sleeve-type adsorber |
| CN104474886A (en) * | 2013-03-20 | 2015-04-01 | 江苏理工学院 | Method for photocatalytically degrading exhaust gas by electrodeless excimer lamp |
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| CA2202716A1 (en) * | 1997-04-15 | 1998-10-15 | The University Of Western Ontario | Photocatalytic reactor and method for destruction of organic air-borne pollutants |
| CN2378113Y (en) * | 1999-05-11 | 2000-05-17 | 中国科学院广州能源研究所 | Photocatalysis air processing device |
| JP2003320220A (en) * | 2002-04-30 | 2003-11-11 | Tokyo Giken:Kk | Air cleaning method for practice room and apparatus therefor |
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| CN102574705A (en) * | 2009-08-25 | 2012-07-11 | 法斯-施塔格迈尔有限责任公司 | Processes and uses of dissociating molecules |
| CN104474886A (en) * | 2013-03-20 | 2015-04-01 | 江苏理工学院 | Method for photocatalytically degrading exhaust gas by electrodeless excimer lamp |
| CN104474886B (en) * | 2013-03-20 | 2016-08-24 | 江苏理工学院 | The method of electrodeless quasi-molecule lamp photocatalytic degradation waste gas |
| CN103453591A (en) * | 2013-08-14 | 2013-12-18 | 广西大学 | Photocatalytic fluidized bed air purifier |
| CN103868158A (en) * | 2014-03-18 | 2014-06-18 | 重庆大学 | Wall-mounted household high-efficiency photocatalysis air purifier |
| CN104014222A (en) * | 2014-06-19 | 2014-09-03 | 东北林业大学 | Sleeve-type adsorber and method for adsorbing and desorbing CO2 by utilizing sleeve-type adsorber |
| CN108283937A (en) * | 2018-03-12 | 2018-07-17 | 南京科技职业学院 | A kind of laboratory exhaust gas processing method and device |
| CN110314629A (en) * | 2019-07-03 | 2019-10-11 | 王文谨 | A kind of baffled multipass formula photocatalytic oxidation degradation pollutant process device |
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