CN1288775A - Photocatalytic air-purifying net in multilayer structure and is making process - Google Patents
Photocatalytic air-purifying net in multilayer structure and is making process Download PDFInfo
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- CN1288775A CN1288775A CN 99116885 CN99116885A CN1288775A CN 1288775 A CN1288775 A CN 1288775A CN 99116885 CN99116885 CN 99116885 CN 99116885 A CN99116885 A CN 99116885A CN 1288775 A CN1288775 A CN 1288775A
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Abstract
The present invention relates to a high-efficiency light catalysed air-cleaning net with multi-layer structure including carrier layer, adhesive layer, active carbon tayer and TiO2 photocatalyst layer and its preparation method. Said invented light-catalysed air-cleaning net with multi-layer structure can implement mutually-promoting process of that using active carbon to adsorb pollutant, light-catalysed degradation of pollutant on TiO2 and in-situ regeneration and purification of active carbon.
Description
The present invention relates to have the photocatalytic air-purifying net of sandwich construction, particularly the present invention relates to comprise carrier layer, adhesive phase, active carbon layer and TiO
2Photocatalytic air-purifying net of the sandwich construction of photocatalyst layer and preparation method thereof.
Various organic and inorganic pollutions, bacterium and virus etc. have caused harm to people's health in the air.Active carbon adsorption is a kind of method that generally adopts in the air cleaning, but there is a saturated adsorbed state in active carbon, and when adsorbing approaching or reaching capacity, the adsorption capacity of active carbon reduces or forfeiture, needs this moment to regenerate.The ozone purification technology can sterilization and is removed the organic and inorganic pollution of a part, but needs use ozone.Recently the ultraviolet light photocatalysis air purifying process that rises has the disposal ability to nearly all organic and inorganic pollution broad spectrum activity.
Because titanium dioxide (TiO
2) have photostability and chemical stability, and cheap and easy to get, so people generally use TiO
2As photochemical catalyst, semiconductor TiO
2Energy gap be about 3.2ev, when energy greater than TiO
2The electromagnetic wave of energy gap (being in near-ultraviolet range) radiation is at TiO
2When last, TiO
2The energy of the Electron absorption ultraviolet photon of valence band is excited on the conduction band, has produced photohole and electronics on valence band and conduction band respectively, when these photo-generated carriers are moved to the surface and by TiO before compound
2The material on surface is (as TiO
2Surface hydroxyl, surface contaminant and water etc.) catch, and then various oxidation-reduction processes take place, the pollutant permineralization becomes carbon dioxide, water and simple inorganic acid the most at last, also can and kill the microorganism dismemberent.
Photocatalytic reaction conditions gentleness (normal temperature, normal pressure) can directly be used airborne O
2As oxidant, be a kind of air purification method very easily therefore.
Because nano-TiO
2Photo-generated carrier is easier to move to TiO on the particle before compound
2The photocatalytic degradation process is also caused on the surface, therefore TiO efficiently
2The photochemical catalyst great majority are that granularity is the ultra-fine grain of 10-50nm.The TiO that occurs nano particle in the practical process
2With the difficult problem of air separation, therefore need nano-TiO in actual use
2Load on the nano-TiO of making support type on the carrier material
2Photochemical catalyst.
In air cleaning, purify and TiO at present with charcoal absorption
2Photocatalytic degradation purifies relevant purification techniques mainly can be divided into the independent charcoal absorption purification techniques of three classes (1) (JP 04,94,714), and this technology purification speed is fast, effective, but active carbon needs regeneration after using certain hour.(2) independent light catalytic purifying technology (JP08,01,010), because photocatalysis is the many intermediate steps of the process technology of pollutant mineralising the most at last, and TiO
2The adsorption capacity of itself is relatively poor, therefore can produce many harmful intermediate products, causes secondary pollution.(3) utilize the mixture of active carbon and photochemical catalyst to carry out air cleaning, be with adsorption function and photo-catalysis function simply add and, in fact owing to the block effect of active carbon to ultraviolet light, for the light catalytic purifying effect be one negative add and process (JP 07,10,8138, EP614,682).
The invention provides and comprise carrier layer, adhesive phase, active carbon layer and TiO
2The photocatalytic air-purifying net of the sandwich construction of photocatalyst layer; The method of the photocatalytic air-purifying net for preparing this sandwich construction also is provided, and this method comprises the following steps: that (1) reaches carrier impregnation at 2-10 minute in adhesive, takes out and dries 1-10 minute; (2) on active carbon powder the has been sprayed to dip-coating carrier of adhesive, after 80-200 ℃ of heating, drying 2-4 hour, solidify, form adhesive phase and active carbon layer; (3) with the carrier impregnation of bonding active carbon at TiO
2, flooded 2-10 minute, afterwards in 80-200 ℃ of oven dry 2-4 hour in the slurries of presoma 1-5 time at every turn.
Fig. 1 is the sandwich construction schematic diagram of air-purifying net of the present invention;
Fig. 2 is the schematic diagram of hexagon cellular shape monoblock type purifying net of the present invention;
Fig. 3 adsorbs-photocatalytic degradation-adsorbent reactivation process schematic diagram for purifying net of the present invention;
Fig. 4 falls graph of a relation with gas flow rate for purifying net pressure of the present invention.
Describe the present invention in detail below with reference to accompanying drawing.
The present invention is with carrier, active carbon and TiO
2Photochemical catalyst constitutes the multi-porous monolithic purifying net of the sandwich construction with clear opening, and as shown in Figure 1, the sandwich construction of purifying net is respectively carrier layer a, adhesive phase b, active carbon layer c and TiO from inside to outside
2Layer of structure such as photocatalyst layer d.
The carrier material of innermost layer can be water-fast paper substrate, Metal Substrate and macromolecular material (as resin, plastics etc.).Its structure is monoblock type net pieces such as hexagon cellular shape (as shown in Figure 2) or corrugated, and the direction of clear opening can be vertical or tilt.With regard to hexagon ring, hexagonal length of side 0.8-3.0 millimeter, wall thickness 0.01-0.5 millimeter.With regard to corrugated, corrugation length of side 0.5-10 millimeter, wall thickness 0.01-0.5 millimeter.
The adhesive that requires to use can form the macroporous network structure when being heating and curing, avoid adhesive to stop up the micropore of active carbon, and the adhesive of polyurethane or polyacrylate is used in general selection.
The active carbon that the present invention uses requires iodine number greater than 1600 for high iodine number active carbon, and granularity is at the 40-200 micrometer range, and this class active carbon has coconut husk charcoal, fruit shell carbon etc.
TiO
2The presoma slurries can be with nanometer (10-50nm) TiO
2Powder directly is dispersed in the water and makes, also can be with the TiO of primary partical particle diameter at 5-50nm
2Aggregate powder of AI/Yt depolymerization or part peptization make.The general TiO that granularity is about 10-50nm that adopts
2Powder is dispersed into stable, monodispersed slurry with equipment such as ultrasonic wave, high speed dispersor or sand mills in the presence of dispersant such as sodium polyphosphate.TiO in the slurry
2Aggregation size is no more than 100nm, TiO in the slurry
2Solid content is about 8% (weight).
The preparation method of the photocatalytic air-purifying net of sandwich construction of the present invention comprises the following steps:
(1) at first on carrier, forms adhesive phase.Carrier impregnation is reached 2-10 minute in adhesive, take out and dried 1-10 minute, make the viscosity maximum of adhesive.The adhesive that requires to use can form the macroporous network structure when being heating and curing, can not stop up the micropore of active carbon.
(2) utilize the viscosity of adhesive to support active carbon powder.Can adopt method such as spraying active carbon powder to be supported on the carrier of adhesive phase, after 80-200 ℃ of heating, drying 2-4 hour, solidify then.To form even active carbon layer when supporting.Active carbon layer thickness is in 0.1-1 millimeter scope.
(3) will support the carrier impregnation of active carbon at TiO
2In the presoma slurries, flood 1-5 time preferably, preferably flood 3 times, flooded 2-10 minute at every turn, afterwards in 80-200 ℃ of oven dry 2-4 hour.
Photochemical catalyst TiO
2On purifying net, form outermost load layer, in fact, TiO
2Load on the active carbon powder particle TiO
2The load bed thickness is the 0.1-10 micron.
The TiO that the present invention adopts
2Carrying method to the not influence of activated carbon capillary structure, promptly do not influence the adsorption capacity of active carbon.
Each layer thickness of the photocatalytic air-purifying net of sandwich construction of the present invention can adopt methods such as calibrator, optical interference method and profile scanning Electronic Speculum to measure.
The characteristics of sandwich construction photocatalytic air-purifying net of the present invention are with carrier, activated carbon of sorbent and photochemical catalyst TiO
2Organically form an integral body.In above-mentioned hierarchical structure, photochemical catalyst TiO
2Be in outermost layer, such structure makes ultraviolet light directly act on TiO under the condition of not blocking
2Photochemical catalyst has been realized maximum light utilization efficiency.
Sandwich construction of the present invention, make carrier and adhesive phase avoid the radiation of ultraviolet light, because could arrive adhesive phase and carrier layer after the bilayer absorption of ultraviolet light through photocatalyst layer and activated carbon adsorption layer, can avoid the aging of adhesive and carrier, make the range of choice of adhesive and carrier enlarge so on the one hand, purifying net can not cause adhesive aging because of the long-term irradiation of ultraviolet light on the other hand, causes active carbon to come off and purifying rate is reduced.
Active carbon and TiO among the present invention
2This combination with the adsorption function and the TiO of active carbon
2Photo-catalysis function organically combine.Active carbon and TiO
2Combining closely of reasonable disposition spatially and molecular level.As shown in Figure 3, reached the mutually promote purpose of process of absorption (enrichment)-photocatalytic degradation-adsorbent reactivation.
Strong suction-operated by active carbon, pollutant to extremely low concentration in the air carries out adsorption cleaning fast, the process that pollutant is adsorbed is equivalent to the process in the activated carbon surface enrichment, the enrichment of pollutant provides a pollution concentration environment much higher with respect to former air for photochemical catalyst, thereby accelerated the reaction speed of photocatalytic degradation pollutant, the activated carbon surface adsorbed contaminants is transferred to TiO by approach such as surface migrations
2The photocatalytic degradation reaction takes place in the surface, and active carbon is regenerated.
On the photocatalytic air-purifying net of sandwich construction of the present invention, reach the process that above-mentioned absorption-photocatalytic degradation-adsorbent reactivation is mutually promoted, overcome the defective of existing air purification method.For independent active carbon purifying, purifying net of the present invention is because above-mentioned pollutant passes through the existence of surface migration-photocatalytic degradation process, make continuously in-situ regeneration of activated carbon of sorbent, activated carbon of sorbent is in the absorption undersaturated condition all the time, promptly can keep the high absorption capacity of active carbon all the time.With respect to independent TiO
2Light catalytic purifying is on the one hand because charcoal absorption is TiO to the enrichment of pollutant
2Photochemical catalyst provides high pollution substrate concentration environment, thereby has accelerated the speed of photocatalytic degradation reaction, owing to the raising of photocatalytic degradation reaction speed, has reduced the growing amount of harmful side product; On the other hand since active carbon to the suction-operated of harmful intermediate product that may generate in the light-catalyzed reaction, even there is intermediate product to generate, also immediately by charcoal absorption, and further therefore photocatalytic degradation does not exist harmful intermediate product to discharge in purifying net purification process of the present invention until permineralization.With TiO
2Compare with the mixture purification process of active carbon, on the one hand structurally, work as TiO
2Mix with active carbon, if active carbon is coated on TiO
2The surface is for this part TiO that is coated
2, ultraviolet light will pass through lighttight active carbon layer earlier, arrives TiO thereby make
2The ultraviolet ray intensity of particle surface weakens, and reduces photocatalytic degradation efficient; On the other hand, because TiO
2With this simple mixing of active carbon, can not reach the pollutant surface migration process that the invention described above purifying net can reach, therefore for TiO
2, not only the pollutant high concentration environment of its enrichment is not provided because of charcoal absorption, even is made TiO by charcoal absorption earlier because of pollutant
2Last pollutant levels lower than in the environment, thus the speed of photocatalytic degradation reduced greatly, migrate to TiO owing to can not reach pollutant from activated carbon surface in addition
2Carry out the process of light-catalyzed reaction, therefore also just can not realize the process of the active carbon in-situ regeneration of purifying net of the present invention.
Fig. 4 is the graph of a relation that gentle speed falls in the pressure of the air-purifying net of the present invention of 6 millimeters and 10 millimeters for measuring thickness respectively, as shown in the figure, the clear opening structure that carrier of the present invention had makes gas fall minimum through the pressure of purifying net, and be subjected to the influence of air-purifying net thickness less, thereby purifying net can be applicable on the various devices, as air-conditioner, air purifier, refrigerator, sterilizing machine, warmer, humidifier etc.
Be embodiments of the invention and Comparative Examples below, the invention will be further described by these embodiment.
Embodiment 1
The brown paper of 0.3 millimeters thick is processed into cellular of hexagon, and the hexagon length of side is 2.5 millimeters, is cut into 175 * 60 * 7 millimeters sample afterwards.This cuboid sample is immersed in polyurethane binder, floods approximately after 6 minutes and take out, dried 6 minutes in room temperature, unnecessary adhesive simultaneously pours off.
This moment, the viscosity of adhesive was bigger, and flowability reduces, and the coconut husk carbon powder was sprayed on the sample, then 120 ℃ of oven dry 2 hours.The iodine number of cocoanut active charcoal is about 1860, and granularity is about the 80-120 micron.Active carbon layer thickness is 0.7 millimeter.
The TiO that granularity is about 10-50nm
2Powder is dispersed into stable, monodispersed slurry with ultrasonic wave in the presence of dispersant such as sodium polyphosphate.TiO in the slurry
2Aggregation size is no more than 100nm, TiO in the slurry
2Solid content be about 8% (weight).
Remove and do not adhere to firm active carbon powder on the support samples, this sample is immersed in above-mentioned TiO
2In the precursor pulp about 5 minutes, take out the back in 140 ℃ of oven dry 4 hours, TiO is flooded in the oven dry of dipping back altogether 3 times once more
2Thickness is 2 microns, makes the air-purifying net that total wall thickness is about 1.8 millimeters paper substrate hexagon cellular shape.
Embodiment 2
The 6W ultraviolet germicidal that air-purifying net sample that embodiment 1 is made and two Gents are levied wavelength 253.7nm is assembled on the gas passage, be accustomed to the use of flow fan and make the air flow circuit, in volume is 125 liters cube seal box, tested photocatalytic air-purifying net of the present invention respectively the purification efficiency of analog gas after 3 hours such as toluene, trichloro-ethylene, formaldehyde, carbon monoxide, ammonia and hydrogen sulfide.
The clean-up effect of table 1 purifying net
| The simulating pollution thing | Toluene | Trichloro-ethylene | Formaldehyde | Carbon monoxide | Ammonia | Hydrogen sulfide | |
| Initial concentration ppm | ?50 | ?1200 | ????1500 | ?2200 | ?240 | ?2800 | ?2000 |
| Concentration ppm after 3 hours | ?0 | ?14.4 | ????7.5 | ?34 | ?96 | ??98 | ??8 |
| 3 hours purifying rate % | ?100 | ?98.8 | ????99.5 | ?98.5 | ?60.1 | ?96.5 | ?99.6 |
| The CO that generates 2Amount ppm | ?127 | ?962 | ????1312 | ?1122 | ?106 | ??* | ??** |
| The CO that complete oxidation generates 2Amount ppm | ?350 | ?8400 | ????3000 | ?2200 | ?240 | ???/ | ???/ |
*The qualitative HNO that detected
3Generate.
*Anticipating property has detected H
2SO
4Generate.
From the test result of table 1 as can be known, purifying net of the present invention comprises that to the purification of pollutant adsorption cleaning and photocatalytic degradation purify two kinds of functions.Analysis to the intermediate product of toluene light catalytic purifying does not detect intermediate products such as phenol, benzaldehyde, benzoic acid, formaldehyde.Through 30 days continuously after the running, to take out purifying net and observe and weigh, outward appearance and weight do not change, and cut fritter sample and fresh sample and test initial toluene light-catalyzed reaction generation CO on photocatalytic activity evaluation experimental device
2Speed constant, show through 30 days the running after do not have inactivation.Above-mentioned test result shows that the photocatalytic air-purifying net of sandwich construction of the present invention has very high purification efficiency (comprising absorption and photocatalysis efficiency) and stability.
Embodiment 3
Method according to embodiment 1 prepares the cellular air-purifying net sample of hexagon, use hexagon also length is 2.5 millimeters, the cellular brown paper of the hexagon that wall thickness is 0.1 millimeter is made 175 * 60 * 7 millimeters cuboid purifying net, difference is: the cellular brown paper of hexagon was immersed in polyurethane binder 3 minutes, takes out the back and dried 3 minutes in room temperature; Active carbon is that iodine number is about 1860 coconut husk charcoal, and granularity is the 40-100 micron, and in 160 ℃ of oven dry 1 hour, active carbon layer thickness was about 0.2 millimeter behind the sprinkling active carbon; With dip-coating the carrier behind the active carbon at TiO
2Dipping is 10 minutes in the slurry, floods 1 time, in 160 ℃ of oven dry 3 hours, TiO
2Thickness is about 0.4 micron.Make the air-purifying net that total wall thickness is about 0.5 millimeter paper substrate hexagon cellular shape and test according to the method for embodiment 2, the initial concentration of toluene is 980ppm, and the concentration that purified back toluene in 3 hours drops to 55ppm, and the toluene purifying rate reaches 94.4%; CO
2Growing amount be 816ppm, do not detect accessory substances such as phenol, benzaldehyde, benzoic acid and formaldehyde.
Embodiment 4
Method according to embodiment 1 prepares the cellular purifying net sample of hexagon, using the hexagon length of side is 3.0 millimeters, the cellular brown paper of the hexagon that wall thickness is 0.4 millimeter is made 175 * 60 * 7 millimeters cuboid purifying net, difference is: the cellular brown paper of hexagon was immersed in polyurethane binder 10 minutes, takes out the back and dried 10 minutes in room temperature; Active carbon is that iodine number is about 1860 coconut husk charcoal, and granularity is the 100-160 micron, and in 200 ℃ of oven dry 3 hours, active carbon layer thickness was about 0.9 millimeter behind the sprinkling active carbon; Dip-coating the carrier behind the active carbon at TiO
2Dipping is 3 minutes in the slurry, in 160 ℃ of oven dry 2 hours, floods once more and dries, and floods TiO altogether 5 times
2Thickness is about 9 microns.Make the cellular air-purifying net of paper substrate hexagon that total wall thickness is about 2,2 millimeters.
Method according to embodiment 1 is tested, and the initial concentration of toluene is 1480ppm, and the concentration that purified back toluene in 3 hours drops to 11.8ppm, and the toluene purifying rate reaches 99.2%; CO
2Growing amount be 1186ppm, do not detect accessory substances such as phenol, benzaldehyde, benzoic acid and formaldehyde.
Embodiment 5
Method according to embodiment 1 prepares the air-purifying net sample, and it is 3 millimeters that difference is to use the corrugation sawtooth length of side, and the corrugation shape brown paper that wall thickness is 0.3 millimeter is made the purifying net carrier of 175 * 60 * 7 millimeters cuboids, and active carbon layer thickness is about 0.7 millimeter, TiO
2Layer thickness is about 3 microns.Make the paper substrate corrugated air-purifying net that total wall thickness is about 1.7 millimeters.
Method according to embodiment 2 is tested, and the initial concentration of toluene is 1260ppm, and the concentration that purified back toluene in 3 hours drops to 15.8ppm, and the toluene purifying rate reaches 98.7%; CO
2Growing amount be 971ppm, do not detect accessory substances such as phenol, benzaldehyde, benzoic acid and formaldehyde.
Reference examples 1
Method according to embodiment 1 prepares the cellular air-purifying net sample of hexagon, and the hexagon length of side is 2.5 millimeters, 0.3 millimeter of wall thickness, and difference is load TiO not
2, promptly this sample only has active carbon layer, and active carbon layer thickness is about 0.7 millimeter.
Method according to embodiment 2 is tested, and the initial concentration of toluene is 1000ppm, and the concentration that purified back toluene in 3 hours drops to 166ppm, and the toluene purifying rate is 83.4%; There is not CO
2Generate.Compare with embodiment 2, purifying rate drops to 83.4% from 98.8%.The contrast of residual toluene amount can be seen at light catalytic purifying of the present invention and exists toluene to move to TiO from activated carbon of sorbent on the net from gas phase
2Photocatalyst surface participates in the photocatalytic degradation process, and activated carbon adsorptive capacity is constantly recovered, and finally makes vapor phase toluene concentration drop to 14.4ppm, promptly has the process by the photocatalysis regenerated carbon.
Reference examples 2
Method according to embodiment 1 prepares the cellular air-purifying net sample of hexagon, and the hexagon length of side is 2.5 millimeters, 0.3 millimeter of wall thickness, and difference is a load type active carbon not, promptly this sample does not have adhesive phase and active carbon layer, and TiO is only arranged
2Layer, this layer thickness is about 2 microns.
Method according to embodiment 2 is tested, and the initial concentration of toluene is 50ppm, and purification back toluene concentration dropped to 42ppm in 3 hours, and the toluene purifying rate only is 16%; Generate the CO of 42ppm
2As known from compared to Example 2, for the pollution of low concentration, when not having acticarbon, the CO that light-catalyzed reaction generates
2Only be 1/3 of embodiment 2.Show on the purifying net of the present invention,, exist because of the effect that the enrichment of low concentration pollutant is promoted photocatalytic process really because of the combining of adsorbent and photochemical catalyst.In the test of this reference examples, detected harmful intermediate product such as phenol, benzaldehyde, benzoic acid and formaldehyde and generated simultaneously.Contrast as can be known with embodiment 2: on purifying net of the present invention, promoted photocatalytic degradation process and active carbon the absorption of middle product effectively to be prevented the secondary pollution of harmful intermediate product owing to enrichment.
Reference examples 3
Method according to embodiment 1 prepares the cellular purifying net sample of hexagon, and the hexagon length of side is 2.5 millimeters, 0.3 millimeter of wall thickness, and after difference is the dip-coating adhesive, load type active carbon and TiO
2Mix powder, the active carbon of load and TiO
2Weight ratio identical with the sample that embodiment 2 makes, this layer thickness is about 0.8 millimeter.
Method according to embodiment 2 is tested, and the initial concentration of toluene is 1200ppm, and the concentration that purified back toluene in 3 hours drops to 264ppm, and the toluene purifying rate is 78.0%, CO
2Growing amount is 161ppm.Compare with embodiment 2, the toluene purifying rate drops to 78.0%, CO from 98.8%
2Growing amount only is 1/6 of the embodiment of the invention 2 purifying nets.Light-catalyzed reaction generates CO
2The minimizing of amount is because active carbon and TiO
2Mixture in, active carbon is to TiO
2Coating hindered ultraviolet light irradiation to TiO
2Reasons such as surface initiation light-catalyzed reaction cause.
Claims (12)
1. photocatalytic air-purifying net with sandwich construction, described sandwich construction comprises carrier layer, adhesive phase, active carbon layer and TiO
2Photocatalyst layer.
2. the photocatalytic air-purifying net of sandwich construction as claimed in claim 1 is characterized in that described active carbon layer thickness is the 0.1-1 millimeter.
3. the photocatalytic air-purifying net of sandwich construction as claimed in claim 1 is characterized in that described active carbon is coconut husk charcoal, the fruit shell carbon of iodine number＞1600.
4. the photocatalytic air-purifying net of sandwich construction as claimed in claim 1, the granularity that it is characterized in that described active carbon is the 40-200 micron.
5. the photocatalytic air-purifying net of sandwich construction as claimed in claim 1 is characterized in that described TiO
2The photochemical catalyst layer thickness is the 0.1-10 micron.
6. the photocatalytic air-purifying net of sandwich construction as claimed in claim 1 is characterized in that described TiO
2Photochemical catalyst is that particle diameter is the superfine Ti O of 10-50nm
2
7. the photocatalytic air-purifying net of sandwich construction as claimed in claim 1 is characterized in that described carrier material is selected from wet-strong paper sill, metal, plastics or resin.
8. the photocatalytic air-purifying net of sandwich construction as claimed in claim 7 is characterized in that described wet-strong paper sill is a brown paper.
9. the photocatalytic air-purifying net of sandwich construction as claimed in claim 1 is characterized in that described carrier material is the cellular net block of material with clear opening.
10. the photocatalytic air-purifying net of sandwich construction as claimed in claim 1 is characterized in that described carrier is the corrugated net block of material with clear opening.
11. the photocatalytic air-purifying net of sandwich construction as claimed in claim 1 is characterized in that described adhesive is selected from polyurethane or polyacrylate.
12. the preparation method of the photocatalytic air-purifying net of a sandwich construction as claimed in claim 1, it comprises the following steps:
(1) with carrier impregnation in adhesive 2-10 minute, takes out and dried 1-10 minute;
(2) activated carbon powder has been sprayed on dip-coating on the carrier behind the adhesive, after 80-200 ℃ of heating, drying 2-4 hour, has solidified, formed adhesive phase and active carbon layer;
(3) will bond the carrier impregnation of active carbon at TiO
2In the slurries of presoma 1-5 time, each 2-10 minute, the dipping back was in 80-200 ℃ of oven dry 2-4 hour.
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|---|---|---|---|
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|---|---|---|---|
| CNB991168852A CN1162211C (en) | 1999-09-17 | 1999-09-17 | Photocatalytic air-purifying net in multilayer structure and is making process |
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| CN1162211C CN1162211C (en) | 2004-08-18 |
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