CN117000039B - A photocatalytic filter and its preparation method and application - Google Patents
A photocatalytic filter and its preparation method and application Download PDFInfo
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- CN117000039B CN117000039B CN202311152276.7A CN202311152276A CN117000039B CN 117000039 B CN117000039 B CN 117000039B CN 202311152276 A CN202311152276 A CN 202311152276A CN 117000039 B CN117000039 B CN 117000039B
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- 230000001699 photocatalysis Effects 0.000 title claims abstract description 92
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000010410 layer Substances 0.000 claims abstract description 121
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 48
- 238000007146 photocatalysis Methods 0.000 claims abstract description 43
- 239000011229 interlayer Substances 0.000 claims abstract description 28
- 239000000758 substrate Substances 0.000 claims abstract description 28
- 239000002245 particle Substances 0.000 claims abstract description 24
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 239000000853 adhesive Substances 0.000 claims abstract description 13
- 230000001070 adhesive effect Effects 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000002844 melting Methods 0.000 claims abstract description 7
- 230000008018 melting Effects 0.000 claims abstract description 7
- 239000004743 Polypropylene Substances 0.000 claims description 133
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 7
- 229920005629 polypropylene homopolymer Polymers 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 6
- 229910021642 ultra pure water Inorganic materials 0.000 claims description 6
- 239000012498 ultrapure water Substances 0.000 claims description 6
- 229920000877 Melamine resin Polymers 0.000 claims description 5
- 238000001354 calcination Methods 0.000 claims description 5
- 238000005286 illumination Methods 0.000 claims description 5
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims 2
- 239000000463 material Substances 0.000 abstract description 12
- 238000005507 spraying Methods 0.000 abstract description 5
- -1 polypropylene maleic anhydride Polymers 0.000 description 8
- 239000008187 granular material Substances 0.000 description 7
- 239000003344 environmental pollutant Substances 0.000 description 6
- 231100000719 pollutant Toxicity 0.000 description 6
- 239000002585 base Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000376 reactant Substances 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 238000004332 deodorization Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000001877 deodorizing effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000013033 photocatalytic degradation reaction Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 241000282887 Suidae Species 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000003115 biocidal effect Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 244000144972 livestock Species 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 238000013032 photocatalytic reaction Methods 0.000 description 1
- 244000144977 poultry Species 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8678—Removing components of undefined structure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8634—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/04—Additives and treatments of the filtering material
- B01D2239/0407—Additives and treatments of the filtering material comprising particulate additives, e.g. adsorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/04—Additives and treatments of the filtering material
- B01D2239/0442—Antimicrobial, antibacterial, antifungal additives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/04—Additives and treatments of the filtering material
- B01D2239/045—Deodorising additives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
- B01D2239/065—More than one layer present in the filtering material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
- B01D2239/065—More than one layer present in the filtering material
- B01D2239/0681—The layers being joined by gluing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/10—Filtering material manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/80—Type of catalytic reaction
- B01D2255/802—Photocatalytic
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
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- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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Abstract
The invention provides a photocatalytic filter screen and a preparation method and application thereof. The photocatalysis filter screen applied to the pig farm is formed by interconnecting a PP substrate layer, a nano interlayer and a PP basal plane layer along the thickness direction of the photocatalysis filter screen, wherein the nano interlayer mainly comprises nano magnetic iron powder and adhesive embedded on the surface of the PP substrate layer, and the PP basal plane layer is formed by solidifying a PP melt, photocatalysis particles uniformly distributed in the PP melt and nano iron powder. The preparation method comprises the steps of keeping the temperature at 5-8 ℃ above the melting point of the raw material melt in the filter screen die, uniformly spraying a layer of nano-scale magnetic iron powder with an adhesive on the surface of the raw material melt, pouring PP basal plane layer melt on the surface of the nano-scale magnetic iron powder, and cooling and forming to obtain the photocatalytic filter screen. The invention can not only greatly improve the utilization rate of the photocatalytic material in the photocatalytic filter screen, but also prolong the service life of the photocatalytic filter screen, and has the advantages of good stability and convenient transportation and use.
Description
Technical Field
The invention belongs to the technical field of photocatalytic filter screens, and particularly relates to a photocatalytic filter screen, a preparation method and application thereof.
Background
The odor concentration generated in the pig farm is high, which not only endangers the health of pigs, but also has great influence on the environment. The technology of livestock and poultry raising environment control, greenhouse gas, ammonia gas and other odor emission reduction is innovated, pig farm environments are gradually valued, and large-scale pig farms and building houses also just start to consider the design of deodorization. However, most pig farms in the prior art adopt a wet curtain leaching deodorization mode, and the deodorization mode has poor treatment effect on bad odor, ammonia gas, pathogenic bacteria and other harmful substances. Although there are few pig farms equipped with deodorizing microbial systems for deodorizing purposes, there are problems in that the reaction conditions are severe and nutrient solutions are required, which brings new problems to the farms.
The photocatalytic reaction is an emerging technology for degrading various large pollutant molecules into harmless small molecular pollutants by utilizing the photocatalytic material to release active free radicals with strong oxidability under light irradiation, and the whole reaction process is thorough and free from secondary pollution, and is widely applied to the removal of pollutants such as printing and dyeing wastewater, antibiotic wastewater, volatile organic compounds, formaldehyde and the like. However, the existing photocatalytic materials are almost in powder form, and have the problems of difficult recovery, low utilization rate, inconvenient transportation and the like in practical application, and the use cost is high, so that photocatalytic degradation pollutants are mostly remained in the stage of laboratory use. More importantly, the photocatalytic framework material often experiences strong acid and alkali environments in the preparation process, which affects the service life of the carrier and the later application effect to a certain extent.
Disclosure of Invention
At least for solving the technical problems mentioned in the background art, the invention aims to provide a photocatalytic filter screen and a preparation method and application thereof.
The invention adopts the following technical scheme.
The photocatalysis filter screen is formed by interconnecting a PP substrate layer, a nano interlayer and a PP basal plane layer along the thickness direction of the photocatalysis filter screen, wherein the nano interlayer mainly comprises nano magnetic iron powder and adhesive embedded on the surface of the PP substrate layer, and the PP basal plane layer is formed by solidifying PP melt, photocatalysis particles uniformly distributed in the PP melt and nano iron powder.
According to the preferable scheme, in the PP base layer, 60-80 parts by weight of homo-polypropylene, 20-40 parts by weight of ethylene-vinyl alcohol copolymer, 3-10 parts by weight of compatilizer, 30-45 parts by weight of photocatalytic particles and 10-15 parts by weight of nanoscale iron powder are calculated.
In order to further improve the service life of the photocatalysis filter screen, a plurality of PP columns penetrating through the nano interlayer are adopted to connect the PP basal layer with the PP basal layer, and the diameter of each PP column is 3-5 mm.
As a preferable scheme, the thickness of the PP basal layer is 1-2 mm, the thickness of the nano interlayer is 0.5-1 mm, and the thickness of the PP basal layer is 1-3 mm.
One of the preparation methods of the photocatalytic filter screen comprises the following steps:
Step 1, adding a raw material melt of a PP substrate layer into a filter screen mould;
step 2, when the temperature of the raw material melt in the filter screen mould is reduced to 5-8 ℃ above the melting point of the raw material melt, keeping the temperature constant, and then uniformly spraying a layer of nano-scale magnetic iron powder with an adhesive on the surface of the raw material melt;
step 3, pouring PP basal plane layer melt on the surface of the nanoscale magnetic iron powder;
and step 4, cooling and forming to obtain the photocatalytic filter screen.
The second preparation method of the photocatalytic filter screen comprises the following steps:
step 11, placing a pre-prepared PP substrate layer in a filter screen mould;
step 12, heating the filter screen mould to enable the temperature of the PP basal layer to be between the melting point and the softening point of the PP basal layer;
step 13, uniformly spraying a layer of nano-scale magnetic iron powder with an adhesive on the surface of the PP basal layer;
step 14, pouring PP basal plane layer melt on the surface of the nanoscale magnetic iron powder;
And step 15, cooling and forming to obtain the photocatalytic filter screen.
The third preparation method of the photocatalytic filter screen comprises the following steps:
Step 21, immersing the PP basal layer into nano-scale magnetic iron powder with an adhesive to load the nano-scale magnetic iron powder on the surface of the PP basal layer, wherein the surface of the PP basal layer is provided with a plurality of micropores, and part of nano-scale magnetic iron powder is embedded into the micropores;
Step 22, placing the PP basal layer loaded with the nanoscale magnetic iron powder in a filter screen mould, suspending the front and back surfaces of the PP basal layer, wherein the thickness of a suspending area is equal to that of the PP basal layer;
step 23, pouring PP basal plane layer melt into a filter screen mould;
and step 24, cooling and forming to obtain the photocatalytic filter screen.
The application of the photocatalysis filter screen is that the photocatalysis filter screen is arranged in an exhaust channel of a pig farm and/or an area with illumination in the pig farm.
The method has the beneficial effects that by adopting the scheme of the invention, the utilization rate of the photocatalytic material in the photocatalytic filter screen can be greatly improved, the service life of the photocatalytic filter screen can be prolonged, meanwhile, the method has the advantages of good stability and convenience in transportation and use, and the raw materials of the photocatalytic filter screen can not experience strong acid and strong alkali environments in the preparation process of the photocatalytic filter screen, thereby being beneficial to fully playing the performance of photocatalytic degradation of pollutants.
Detailed Description
The following description of the embodiments of the present invention will be apparent and complete, and it is to be understood that the embodiments described are merely some, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment 1 is a photocatalysis filter screen, which is formed by interconnecting a PP substrate layer, a nano interlayer and a PP basal plane layer along the thickness direction of the photocatalysis filter screen, wherein the nano interlayer mainly comprises nano magnetic iron powder (particle diameter is 500-800 nm) embedded on the surface of the PP substrate layer and a bonding material, and the PP basal plane layer is formed by solidifying a PP melt, photocatalysis particles uniformly distributed in the PP melt (the photocatalysis particles are obtained by mixing Desoxhlet P25 and melamine according to the mass ratio of 2:5, and simultaneously adding 30mL of ultrapure water, and calcining for 2h at 550 ℃ in a muffle furnace at the heating rate of 10 ℃ per min). In the embodiment, in the PP base layer, 70 parts by weight of homo-polypropylene, 25 parts by weight of ethylene-vinyl alcohol copolymer, 4 parts by weight of compatilizer (reactants of polypropylene maleic anhydride graft and ethylene-vinyl alcohol copolymer, wherein the polypropylene maleic anhydride graft accounts for 5.5wt% of the system), 35 parts by weight of photocatalytic particles and 12 parts by weight of nanoscale iron powder are calculated according to the weight ratio. Wherein, the thickness of the PP basal layer is 2+/-0.1 mm, the thickness of the nanometer interlayer is 0.6+/-0.1 mm, and the thickness of the PP basal layer is 2+/-0.1 mm.
The preparation method of the photocatalytic filter screen in the embodiment comprises the following steps:
Step 1, adding a raw material melt of a PP substrate layer into a filter screen mould;
step 2, when the temperature of the raw material melt in the filter screen mould is reduced to 5-8 ℃ above the melting point of the raw material melt, keeping the temperature constant, and then uniformly spraying a layer of nano-scale magnetic iron powder with an adhesive on the surface of the raw material melt;
step 3, pouring PP basal plane layer melt on the surface of the nanoscale magnetic iron powder;
and step 4, cooling and forming to obtain the photocatalytic filter screen.
The embodiment 2 is characterized in that the photocatalytic filter screen is formed by mutually connecting a PP substrate layer, a nano interlayer and a PP basal plane layer along the thickness direction of the photocatalytic filter screen, wherein the nano interlayer mainly comprises nano magnetic iron powder (particle size 900-950 nm) embedded on the surface of the PP substrate layer and a binder, and the PP basal plane layer is formed by solidifying a PP melt, photocatalytic particles uniformly distributed in the PP melt (the photocatalytic particles are obtained by mixing Desoxhlet P25 and melamine according to the mass ratio of 2:7, 41mL of ultrapure water is added, and the mixture is calcined for 2h at 550 ℃ in a muffle furnace at the heating rate of 10 ℃ per min) and the nano iron powder. In the embodiment, in the PP base layer, 60 parts by weight of homo-polypropylene, 25 parts by weight of ethylene-vinyl alcohol copolymer, 3 parts by weight of compatilizer (reactants of polypropylene maleic anhydride graft and ethylene-vinyl alcohol copolymer, wherein the polypropylene maleic anhydride graft accounts for 3.5wt% of the system), 45 parts by weight of photocatalytic particles and 15 parts by weight of nanoscale iron powder are calculated according to the weight ratio. Wherein, the thickness of the PP basal layer is 1.5+/-0.1 mm, the thickness of the nanometer interlayer is 0.8+/-0.1 mm, and the thickness of the PP basal layer is 3+/-0.1 mm.
The preparation method of the photocatalytic filter screen in the embodiment comprises the following steps:
step 11, placing a pre-prepared PP substrate layer in a filter screen mould;
Step 12, heating the filter screen mould to enable the temperature of the PP basal layer to be intermediate between the melting point and the softening point of the PP basal layer;
step 13, uniformly spraying a layer of nano-scale magnetic iron powder with an adhesive on the surface of the PP basal layer;
step 14, pouring PP basal plane layer melt on the surface of the nanoscale magnetic iron powder;
And step 15, cooling and forming to obtain the photocatalytic filter screen.
Embodiment 3A photocatalysis filter screen is formed by interconnecting a PP basal layer, a nano interlayer and a PP basal layer along the thickness direction of the photocatalysis filter screen, wherein the nano interlayer mainly comprises nano magnetic iron powder (particle size is 800-900 nm) embedded on the surface of the PP basal layer and a bonding material, and the PP basal layer is formed by solidifying a PP melt, photocatalysis materials uniformly distributed in the PP melt (the photocatalysis particles are obtained by mixing Desoxhlet P25 and urea according to the mass ratio of 2:9, simultaneously adding 50mL of ultrapure water, and calcining for 2h at 550 ℃ in a muffle furnace at the heating rate of 10 ℃ per min). In the embodiment, in the PP base layer, 80 parts by weight of homo-polypropylene, 40 parts by weight of ethylene-vinyl alcohol copolymer, 10 parts by weight of compatilizer (reactants of polypropylene maleic anhydride graft and ethylene-vinyl alcohol copolymer, wherein the polypropylene maleic anhydride graft accounts for 8wt% of the system), 45 parts by weight of photocatalytic particles and 10 parts by weight of nanoscale iron powder are calculated according to the weight ratio. Wherein, the thickness of the PP basal layer is 1.8+/-0.1 mm, the thickness of the nanometer interlayer is 0.9+/-0.1 mm, and the thickness of the PP basal layer is 1.5+/-0.1 mm.
The preparation method of the photocatalytic filter screen in the embodiment comprises the following steps:
Step 21, immersing the PP basal layer into nano-scale magnetic iron powder with an adhesive to load the nano-scale magnetic iron powder on the surface of the PP basal layer, wherein the surface of the PP basal layer is provided with a plurality of micropores, and part of nano-scale magnetic iron powder is embedded into the micropores;
Step 22, placing the PP basal layer loaded with the nanoscale magnetic iron powder in a filter screen mould, suspending the front and back surfaces of the PP basal layer, wherein the thickness of a suspending area is equal to that of the PP basal layer;
step 23, pouring PP basal plane layer melt into a filter screen mould;
and step 24, cooling and forming to obtain the photocatalytic filter screen.
The embodiment 4 relates to a photocatalysis filter screen, which is formed by mutually connecting a PP substrate layer, a nano interlayer and a PP basal plane layer along the thickness direction of the photocatalysis filter screen, wherein a plurality of PP columns penetrating through the nano interlayer are adopted to connect the PP substrate layer and the PP basal plane layer together, the diameter of each PP column is 4+/-0.5 mm, the nano interlayer mainly comprises nano magnetic iron powder (particle size 600-700 nm) embedded on the surface of the PP substrate layer and a bonding material, and the PP substrate layer is formed by solidifying a PP melt, photocatalysis particles uniformly distributed in the PP melt (the photocatalysis particles are obtained by mixing Desoxhlet P25 and melamine or 2:2.5 according to the mass ratio, and simultaneously adding 15mL of ultrapure water and calcining 2h in a muffle furnace at 550 ℃ at a heating rate of 10 ℃ per min). In the embodiment, in the PP base layer, 750 parts of homo-polypropylene, 25 parts of ethylene-vinyl alcohol copolymer, 8 parts of compatilizer (reactants of polypropylene maleic anhydride graft and ethylene-vinyl alcohol copolymer, wherein the polypropylene maleic anhydride graft accounts for 2wt% of the system), 40 parts of photocatalytic particles and 15 parts of nano-scale iron powder are calculated according to the weight ratio. Wherein, the thickness of the PP basal layer is 1.5+/-0.1 mm, the thickness of the nanometer interlayer is 0.7+/-0.1 mm, and the thickness of the PP basal layer is 1.8+/-0.1 mm.
Example 5 the photocatalytic filter according to the previous example was installed in the exhaust channel of a pig farm and/or in areas with illumination in the pig farm.
According to the invention, the photocatalysis filter screen with a specific structure is adopted, and the nano interlayer can not only prevent the PP basal layer from being completely oxidized and failed, but also enable the PP basal layer to be combined more stably, and can also improve the activity of the photocatalysis material in the PP basal layer. In the use, after the photocatalysis filter screen receives the illumination, the partial photocatalysis granule that receives the illumination can react with the PP material in the PP basal plane layer, take place the reaction simultaneously and carry out air treatment with the pollutant, along with the continuation of reaction, the photocatalysis granule that is located PP basal plane layer surface can drop gradually, afterwards, the inside partial photocatalysis granule that is located the PP basal plane layer originally will expose outside, continue to play air treatment's effect (one of the core points of its technical route lies in having new photocatalysis granule to continue to expose after the photocatalysis granule drops the inefficacy, until the photocatalysis granule in the PP basal plane layer is complete inefficacy), thereby realize the make full use of photocatalysis granule, the life of photocatalysis filter screen has been prolonged by a wide margin.
In the invention, the photocatalytic filter screen has wide sources of framework materials and extremely low manufacturing cost, is favorable for preparing single-layer or multi-layer flaky, cylindrical and curved photocatalytic filter screens, and is particularly suitable for large-area popularization and application in pig farms.
Claims (5)
1. The preparation method of the photocatalysis filter screen is characterized by comprising the following steps:
Step 1, adding a raw material melt of a PP substrate layer into a filter screen mould;
Step2, when the temperature of the raw material melt in the filter screen mould is reduced to 5-8 ℃ above the melting point of the raw material melt, keeping the temperature constant, and then immersing the PP basal layer into nano-scale magnetic iron powder with an adhesive to load the nano-scale magnetic iron powder on the surface of the PP basal layer;
step 3, pouring PP basal plane layer melt on the surface of the nanoscale magnetic iron powder;
step4, cooling and forming to obtain a photocatalysis filter screen;
The photocatalysis filter screen is formed by interconnecting a PP substrate layer, a nano interlayer and a PP basal plane layer along the thickness direction of the photocatalysis filter screen, wherein the nano interlayer mainly comprises nano magnetic iron powder and adhesive which are embedded on the surface of the PP substrate layer, the PP basal plane layer is formed by solidifying PP melt, photocatalysis particles uniformly distributed in the PP melt and the nano iron powder, the PP substrate layer comprises 60-80 parts of homo-polypropylene, 20-40 parts of ethylene-vinyl alcohol copolymer, 3-10 parts of compatilizer, 30-45 parts of photocatalysis particles and 10-15 parts of nano iron powder according to the weight ratio, the PP substrate layer is connected with the PP basal plane layer by adopting a plurality of PP columns penetrating through the nano interlayer, the diameter of the PP columns is 3-5 mm, the thickness of the PP substrate layer is 1-2 mm, the thickness of the nano interlayer is 0.5-1 mm, and the thickness of the PP basal plane layer is 1-3 mm;
The photocatalytic particles are obtained by mixing Desoxepin P25 and melamine in a mass ratio of 2:5, adding 30mL of ultrapure water, and calcining at a temperature rising rate of 10 ℃ per minute for 2 hours in a muffle furnace at 550 ℃.
2. The method for preparing the photocatalytic filter as set forth in claim 1, wherein in step 2:
the surface of the PP basal layer is provided with a plurality of micropores, part of nano-scale magnetic iron powder is embedded into the micropores, the PP basal layer loaded with the nano-scale magnetic iron powder is placed in a filter screen mould, the front surface and the back surface of the PP basal layer are suspended, and the thickness of a suspended area is equal to that of the PP basal layer.
3. The preparation method of the photocatalysis filter screen is characterized by comprising the following steps:
step 11, placing a pre-prepared PP substrate layer in a filter screen mould;
step 12, heating the filter screen mould to enable the temperature of the PP basal layer to be between the melting point and the softening point of the PP basal layer;
step 13, immersing the PP basal layer into nano-scale magnetic iron powder with an adhesive, so that the nano-scale magnetic iron powder is loaded on the surface of the PP basal layer;
step 14, pouring PP basal plane layer melt on the surface of the nanoscale magnetic iron powder;
step 15, cooling and forming to obtain the photocatalytic filter screen;
The photocatalysis filter screen is formed by interconnecting a PP substrate layer, a nano interlayer and a PP basal plane layer along the thickness direction of the photocatalysis filter screen, wherein the nano interlayer mainly comprises nano magnetic iron powder and adhesive which are embedded on the surface of the PP substrate layer, the PP basal plane layer is formed by solidifying PP melt, photocatalysis particles uniformly distributed in the PP melt and the nano iron powder, the PP substrate layer comprises 60-80 parts of homo-polypropylene, 20-40 parts of ethylene-vinyl alcohol copolymer, 3-10 parts of compatilizer, 30-45 parts of photocatalysis particles and 10-15 parts of nano iron powder according to the weight ratio, the PP substrate layer is connected with the PP basal plane layer by adopting a plurality of PP columns penetrating through the nano interlayer, the diameter of the PP columns is 3-5 mm, the thickness of the PP substrate layer is 1-2 mm, the thickness of the nano interlayer is 0.5-1 mm, and the thickness of the PP basal plane layer is 1-3 mm;
The photocatalytic particles are obtained by mixing Desoxepin P25 and melamine in a mass ratio of 2:5, adding 30mL of ultrapure water, and calcining at a temperature rising rate of 10 ℃ per minute for 2 hours in a muffle furnace at 550 ℃.
4. A method of preparing a photocatalytic filter as set forth in claim 3, wherein in step 13:
the surface of the PP basal layer is provided with a plurality of micropores, part of nano-scale magnetic iron powder is embedded into the micropores, the PP basal layer loaded with the nano-scale magnetic iron powder is placed in a filter screen mould, the front surface and the back surface of the PP basal layer are suspended, and the thickness of a suspended area is equal to that of the PP basal layer.
5. The method for preparing a photocatalytic filter screen according to any one of claims 1 to 4, wherein the photocatalytic filter screen is installed in an exhaust passage of a pig farm and/or an area with illumination in the pig farm.
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| US4707399A (en) * | 1985-12-13 | 1987-11-17 | Minnesota Mining And Manufacturing Company | Bicomponent ceramic fibers |
| JPH07155598A (en) * | 1993-12-10 | 1995-06-20 | Toto Ltd | Photocatalyst coating film and its formation |
| CA2124389C (en) * | 1993-11-16 | 2005-08-23 | Richard D. Pike | Nonwoven filter media |
| JP3693363B2 (en) * | 1994-03-30 | 2005-09-07 | 松下エコシステムズ株式会社 | Supporting method for forming a photocatalyst layer |
| WO1998012048A1 (en) * | 1996-09-20 | 1998-03-26 | Hitachi, Ltd. | Thin photocatalytic film and articles provided with the same |
| JP2005205378A (en) * | 2003-12-25 | 2005-08-04 | Ｊａｐａｎ Ｃｏｍｍｕｎｉｃａｔｉｏｎｓ 株式会社 | Functional particle carrier and its manufacturing method |
| US20100054988A1 (en) * | 2008-08-29 | 2010-03-04 | Kwangyeol Lee | Photocatalytic nanocapsule and fiber for water treatment |
| CN205273130U (en) * | 2015-12-02 | 2016-06-01 | 中山市完美生活器材科技有限公司 | Car air purifier |
| CN106362486A (en) * | 2016-09-06 | 2017-02-01 | 安徽丰磊制冷工程有限公司 | Ferroferric oxide-polypropylene hybridization electret air filtration material and preparation method thereof |
| US11213777B2 (en) * | 2019-09-06 | 2022-01-04 | Imam Abdulrahman Bin Faisal University | Titanium oxide-comprising fibrous filter material |
| FR3104455B1 (en) * | 2019-12-17 | 2021-12-03 | Ifp Energies Now | PROCESS FOR PHOTOCATALYTICAL REDUCTION OF CARBON DIOXIDE IN THE PRESENCE OF A PHOTOCATALYZER PREPARED BY IMPREGNATION IN MELT MEDIUM |
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