CN1218778C - Preparation method of load type photocatalytic purification net block - Google Patents

Preparation method of load type photocatalytic purification net block Download PDF

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Publication number
CN1218778C
CN1218778C CN 03150618 CN03150618A CN1218778C CN 1218778 C CN1218778 C CN 1218778C CN 03150618 CN03150618 CN 03150618 CN 03150618 A CN03150618 A CN 03150618A CN 1218778 C CN1218778 C CN 1218778C
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China
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catalyst
tourmaline
latex
net piece
light catalytic
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CN 03150618
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Chinese (zh)
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CN1515352A (en
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古宏晨
徐宏
吴亚妮
程存康
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上海交通大学
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Abstract

The present invention relates to a method for preparing a supported photocatalysis purification net block, and belongs to a photocatalysis field. The method comprises the following steps of using active carbon as an adsorbent, a high efficiency composite catalyst as a photocatalyst and tourmaline as auxiliary materials, effectively compounding the active carbon, the composite photocatalyst and the tourmaline powder with a physical and mechanical mixed method to prepare a multifunctional high efficiency photocatalyst, then adopting aqueous latex as adhesive, mixing and dispersing the multifunctional high efficiency photocatalyst and the aqueous latex liquor to obtain stable suspended seriflux, and finally evenly coating a catalyst coating layer on a catalyst carrier by a spraying or dip coating technique to obtain the supported photocatalysis purification net block. The degradation rate of the present invention for organic pollutants, such as methanal, benzene, ammonia, etc., reaches more than 90%; meanwhile, the generation concentration of negative ions is more than 1000/cm<3>, the supported photocatalysis purification net block has high sterilization efficiency, and the sterilization rate of bacteria is larger than 90%. The supported photocatalysis purification net block can be used in indoor air purifying components of central air conditioners, etc., and can improve life quality.

Description

The preparation method of support type light catalytic purifying net piece
Technical field
The present invention relates to a kind of preparation method of light catalytic purifying net piece, particularly a kind of preparation method of support type light catalytic purifying net piece.Belong to photocatalysis field.
Background technology
In recent years, environmental pollution has been subjected to the common concern in the whole world.The material that uses in air cleaning at present mainly is to adopt active carbon or nonwoven, because they have high absorption capacity, purification speed is fast, and short run effect is comparatively remarkable, so be extensive use of in various air cleaning facilities.Yet there is the saturated limit of absorption in this class material, it must be taken out from equipment during regeneration, operates cumbersomely, also easily causes secondary pollution, and material itself does not possess sterilization or antibacterial function yet.
In recent ten years, utilize semiconductor powder to become one of the most active field of curbing environmental pollution as the research of photocatalytic degradation organic or inorganic pollutant.Find by literature search, Chinese patent application number is: 99116885.2, name is called: photocatalytic air-purifying net of sandwich construction and preparation method thereof, publication number is: 1288775, this patent disclosure a kind ofly have carrier layer, adhesive phase, active carbon layer and a TiO 2The preparation method of the air-purifying net of the high-effective multilayer structure of photocatalyst layer is with charcoal absorption pollutant--TiO 2Mutually promoting that photocatalytic degradation---active carbon regeneration purifies combines together, and this purifying net is under the 253.7nm UV-irradiation, to the degradation rate of toluene, formaldehyde, trichloro-ethylene, ammonia, hydrogen sulfide more than 95%, to the degradation rate of carbon monoxide more than 60%.But the method adopt polyurethane adhesive as basalis with active carbon and TiO 2Be bonded in carrier surface, because the viscosity of polyurethane is higher, when being coated in the surface, easily the duct of active carbon is blocked on the one hand composite photo-catalyst, reduce adsorption capacity, on the other hand since exist with glue many cause catalyst to block the carrier mesh or lacked problems such as bonding is not firm with glue, thereby make purifying net ventilate smooth, outward appearance is not attractive in appearance even influence catalytic efficiency.In addition, data from this patent description, all degradation models all adopt the high situation of pollutant initial concentration (more than the 1000ppm), and what meaning this does not have to true indoor air purification, do not see in the literary composition and hang down the data that primary pollutant concentration is carried out photocatalytic degradation.
Summary of the invention
The present invention is directed to the problems referred to above that exist in the background technology, a kind of preparation method of support type light catalytic purifying net piece is provided.This method has at first been abandoned the employing solvent-based adhesive and has been selected water-based latex as adhesive, secondly select the good active carbon of organic pollution absorption property as adsorbent, particle mean size is that the efficient composite catalyst that contains the electron-hole pair trapping agent of 10~20nm is as photochemical catalyst of the present invention.In addition, the present invention has adopted a kind of energy to produce the natural polarity ore of a large amount of anions--and-tourmaline has overcome the NO that is brought by the high-voltage corona discharge generating negative ions fully as the auxiliary material that the air comfort level is improved xOr O 3Deng pernicious gas.
The present invention is achieved by the following technical solutions, the preparation method of support type light catalytic purifying net piece of the present invention is as follows: adopt active carbon as adsorbent, efficient composite catalyst is as photochemical catalyst, tourmaline is as auxiliary material, with active carbon, composite photo-catalyst and tourmaline powder carry out the effectively compound multifunctional efficient photochemical catalyst for preparing by the physical mechanical mixed method, adopt water-based latex as adhesive then, the multifunctional efficient photochemical catalyst is mixed with the water-base cement emulsion, disperse, make stable suspension slurry, adopt spraying or dipping process that the catalyst cupport carrier is evenly covered catalyst coat at last, obtain support type light catalytic purifying net piece.
The multifunctional efficient photochemical catalyst can be adsorbed on organic pollution in the activated carbon granule quickly and efficiently, passes through TiO again 2Photocatalysis property with absorption harmful substance be degraded into CO 2With H 2O, and TiO 2High photolytic activity raises the powder energy, the H that degraded produces 2The ability that O impels the tourmaline of polarity to produce anion again significantly improves, so the prepared photochemical catalyst of the present invention integrates absorption, catalytic degradation, anion generation, bactericidal, various functions are replenished mutually, mutually promote, Preparation of Catalyst support type light catalytic purifying net piece and photocatalysis air cleaning device can be used for the purification (situation that pollutant levels are lower) of room air thus, can make simultaneously indoor negative ion concentration reach (500~1000/cm3), improved the life comfort level greatly of the levels in suburb, wilderness or park.
Below method of the present invention is further described, concrete steps are as follows:
(1) active carbon, composite photo-catalyst and tourmaline powder are made the multifunctional efficient photochemical catalyst by mechanical mixture by a certain percentage, wherein activated carbon dosage is 10~40%, and the photochemical catalyst consumption is 20~60%, and the tourmaline use amount is 10~40%.
(2) above-mentioned multifunctional efficient photochemical catalyst is mixed with the water-base cement emulsion, and disperse, make stable suspension slurry with high speed dispersor or ultrasonic wave.The total solid content of slurries is about 45%.
(3) with the catalyst cupport carrier impregnation in above-mentioned suspension slurry or adopt spraying evenly to cover the last layer catalyst coat on carrier, after 100 degrees centigrade of drying boxes oven dry, can repeat coating as required, obtain support type light catalytic purifying net piece.
Ature of coal particle (or powder) active carbon or shell particle (or powder) active carbon of described active carbon for organic matter is had extremely strong adsorption capacity; its iodine number is greater than 1000mg/g; need before use activated carbon granule or powder are pulverized, select granularity standby greater than 600 orders.
Described composite photo-catalyst is that particle mean size is the efficient composite photo-catalyst that contains electron-hole pair trapping agent (can effectively reduce the recombination probability of electron-hole pair) of 10~20nm, wherein anatase titanium dioxide TiO 2Content be more than 85%, the electron-hole pair trapping agent is some metal oxides except that titanium, can be aluminium oxide, silica, molybdenum oxide or rare earth oxide etc.
The described tourmaline raw material that can produce anion is a crude tourmaline, as iron tourmaline, dravite, iron dravite, elbaite, and it is carried out ultra-fine grinding, the screening granularity is more preferably the light greenish blue grey superfine powder below 5 microns less than below 20 microns.
Described water-base cement emulsion can be in styrene-acrylic latex, pure third latex, polyurethane rubber latex, vinylacetate latex, the acrylate and vinyl acetate emulsion one or more, and latex solid content about 30~50%, MFT are 50 degrees centigrade~90 degrees centigrade.
Described catalyst cupport carrier is cellular or corrugated is made of paper, the netted module of aluminium base or plastic base, and size and shape can be cut out arbitrarily, and the net piece duct length of side is preferably below the 1mm, more than the thickness 6mm, guarantees that the net piece has certain rigidity to be advisable.
The present invention has substantive distinguishing features and marked improvement, the present invention select water-based latex as adhesive, active carbon as adsorbent, efficient composite catalyst adopts tourmaline as auxiliary material as photochemical catalyst, has overcome the NO that is brought by the high-voltage corona discharge generating negative ions fully xOr O 3Deng pernicious gas.By the multifunctional efficient photochemical catalyst that active carbon, composite photo-catalyst and tourmaline powder are made, integrate absorption, catalytic degradation, anion generation, bactericidal, various functions are replenished mutually, mutually promote.The air cleaning unit that employing the present invention makes the not only degradation rate of organic pollutions such as PARA FORMALDEHYDE PRILLS(91,95), benzene, ammonia reaches (benzene is about 60%) more than 90%, and the concentration of anion generation simultaneously is 1000/cm 3More than, and have sterilizing ability efficiently, bacterium go out except that rate greater than 90%.Can use at the purification assembly as room air such as central air-conditioning, air purifier, greatly improve the life comfort level.
The specific embodiment
Provide following examples in conjunction with content of the present invention:
Embodiment 1
Carry out ature of coal high-adsorption active carbon powder, composite photo-catalyst, dravite powder compound and pulverize making multifunctional efficient photochemical catalyst A through air-flow, wherein active carbon powder content is 30%, the composite photocatalyst agent content is 60%, and the dravite content of powder is 10%.A, small particle diameter benzene emulsion, deionized water are made into stable suspension slurry B by mass ratio 1: 2.5: 1.25 and in high speed dispersor or ultrasonic disintegrator.Will long 360mm, wide is 230mm, thick in the aluminium base Cellular Networks of 6mm (dilute acid wash processing in advance) is immersed among the slurry B, all is immersed in the slurry with the net piece and is advisable.Flood after 2 minutes and to take out, remove the unnecessary slurry that hangs in the mesh after, be placed in 100 degrees centigrade of drying boxes and dry, and then adopt same procedure coating one deck.Get two such light catalytic purifying net pieces and be placed in and purify the two ends of the stainless steel passage of the same specification of piece respectively, the stainless steel passage length is 20cm, is 8 watts of uviol lamps of 253.7nm in 2 dominant wavelengths of passage central authorities' arranged parallel.This device is put in a 1M 3In the work chamber, install an end distance at this install air-supply for this reason from photocatalysis net piece 15cm place placement one axial flow blower.Also place four axial flow blowers respectively and make the cabin inner air convection for four jiaos in the work chamber.Temperature is 20 ℃ in the cabin, humidity 50%RH, wind speed 0.5m/s.Gradation is injected with organic pollutants formaldehyde 5.0ppm respectively in work chamber, benzene 16.5ppm, ammonia 5.3ppm, total number of bacteria>100/ware.Open uviol lamp test light catalytic effect, the Degradation Formaldehyde rate is 93% after 3 hours, and the benzene degradation rate is that the ammonia degradation rate is 95% after 68%, 1 hour, and bacterium place to go rate is 91%, and negative ion concentration is 800/cm 3
Embodiment 2
Prepare multifunctional efficient photochemical catalyst and light catalytic purifying net piece according to embodiment 1 described method, different aspects one is that high-adsorption active carbon is a coconut carbon, the 2nd, active carbon powder content is 10%, and the composite photocatalyst agent content is 50%, and the dravite content of powder is 40%.Be placed in this purifying net piece on the purifier that embodiment 1 describes and with this device as in the work chamber, gradation is injected with organic pollutants formaldehyde 7.8ppm respectively in work chamber, benzene 23.9ppm, ammonia 5.5ppm, total number of bacteria>100/ware.Open uviol lamp test light catalytic effect, the Degradation Formaldehyde rate is 90% after 3 hours, and the benzene degradation rate is that the ammonia degradation rate is 92% after 66%, 1 hour, and bacterium place to go rate is 89%, and negative ion concentration is 1200/cm 3
Embodiment 3
Prepare multifunctional efficient photochemical catalyst and light catalytic purifying net piece according to embodiment 1 described method, different aspects one is that aqueous binder is a pure-acrylic emulsion, the 2nd, active carbon powder content is 40%, the composite photocatalyst agent content is 20%, the dravite content of powder is 40%, the 3rd, used carrier is a corrugated made of paper, and size and thickness are with embodiment 1.Be placed in this purifying net piece on the purifier that embodiment 1 describes and with this device as in the work chamber, gradation is injected with organic pollutants formaldehyde 5.6ppm respectively in work chamber, benzene 20.3ppm, ammonia 5.8ppm, total number of bacteria>100/ware.Open uviol lamp test light catalytic effect, the Degradation Formaldehyde rate is 84% after 3 hours, and the benzene degradation rate is that the ammonia degradation rate is 88% after 55%, 1 hour, and bacterium place to go rate is 90%, and negative ion concentration is 1200/cm 3
Embodiment 4
Prepare multifunctional efficient photochemical catalyst and light catalytic purifying net piece according to embodiment 1 described method, different is that two light catalytic purifying net pieces are respectively put at the purifier two ends, gradation is injected with organic pollutants formaldehyde 7.6ppm respectively in work chamber, benzene 23.3ppm, ammonia 5.8ppm, total number of bacteria>100/ware.Open uviol lamp test light catalytic effect, the Degradation Formaldehyde rate is that the Degradation Formaldehyde rate is that the benzene degradation rate is that the ammonia degradation rate is 96% after 72%, 1 hour after 97%, 3 hour after 80%, 3 hour after 1 hour, and bacterium place to go rate is 93%, and negative ion concentration is 1500/cm 3
Comparative Examples
Prepare multifunctional efficient photochemical catalyst and light catalytic purifying net piece according to embodiment 1 described method, active carbon of no use in the different multifunctional photocatalysis agent, composite photocatalyst agent content are 66.7%, and the dravite mass content is 33.3%.Be placed in this purifying net piece on the purifier that embodiment describes and with this device as in the work chamber, gradation is injected with organic pollutants formaldehyde 5.0ppm respectively in work chamber, benzene 16.5ppm, ammonia 5.3ppm, total number of bacteria>100/ware.Open uviol lamp test light catalytic effect, the Degradation Formaldehyde rate is 95% after 3 hours, and it is that the ammonia degradation rate is 89% after 9%, 1 hour that benzene removes degradation rate, and bacterium place to go rate is 80%, and negative ion concentration is 1000/cm 3

Claims (4)

1, a kind of preparation method of support type light catalytic purifying net piece, it is characterized in that, the preparation method is as follows: adopt active carbon as adsorbent, efficient composite catalyst as photochemical catalyst, tourmaline is as auxiliary material, described efficient composite catalyst be particle mean size be 10~20nm contain the efficient composite catalyst of electronics-hole to trapping agent, wherein anatase titanium dioxide TiO 2Content be more than 85%, electronics-hole is an aluminium oxide to trapping agent, silica, a kind of in molybdenum oxide or the rare earth oxide, ature of coal particle or the Powdered Activated Carbon of described active carbon for organic matter is had extremely strong adsorption capacity, or shell particle, its iodine number is greater than 1000mg/g, before use activated carbon granule or powder are pulverized, select granularity standby greater than 600 orders, at first with active carbon, efficient composite catalyst and tourmaline powder are mixed and made into the multifunctional efficient photochemical catalyst by physical mechanical in proportion, wherein activated carbon dosage is 10~40%, the efficient composite catalyst consumption is 20~60%, and the tourmaline use amount is 10~40%; Adopt water-based latex as adhesive then, described water-based latex is selected one or more in styrene-acrylic latex, pure third latex, polyurethane rubber latex, vinylacetate latex, the acrylate and vinyl acetate emulsion for use, latex solid content 30~50%, MFT is 50 degrees centigrade~90 degrees centigrade, the multifunctional efficient photochemical catalyst is mixed, disperses with the water-base cement emulsion, make stable suspension slurry, adopt spraying or dipping process that the catalyst cupport carrier is evenly covered catalyst coat at last, obtain support type light catalytic purifying net piece.
2, the preparation method of support type light catalytic purifying net piece according to claim 1 is characterized in that concrete steps are as follows:
(1) above-mentioned multifunctional efficient photochemical catalyst is mixed with the water-base cement emulsion, and disperse with high speed dispersor or ultrasonic wave, make stable suspension slurry, the total solid content of slurries is 45%;
(2) with the catalyst cupport carrier impregnation in above-mentioned suspension slurry or adopt spraying evenly to cover the last layer catalyst coat on carrier, after 100 degrees centigrade of drying boxes oven dry, perhaps repeat coating as required, obtain support type light catalytic purifying net piece.
3, the preparation method of support type light catalytic purifying net piece according to claim 1 and 2, it is characterized in that, the described tourmaline raw material that can produce anion is the crude tourmaline of iron tourmaline, dravite, iron dravite, elbaite, and it is carried out ultra-fine grinding, the screening granularity is less than 20 microns.
4, the preparation method of support type light catalytic purifying net piece according to claim 1 and 2, it is characterized in that, described catalyst cupport carrier is cellular or corrugated is made of paper, the netted module of aluminium base or plastic base, size and shape can be cut out arbitrarily, the net piece duct length of side is below the 1mm, more than the thickness 6mm.
CN 03150618 2003-08-28 2003-08-28 Preparation method of load type photocatalytic purification net block CN1218778C (en)

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