CN109569101B - Filter screen for air purifier and preparation method thereof - Google Patents
Filter screen for air purifier and preparation method thereof Download PDFInfo
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- CN109569101B CN109569101B CN201811506829.3A CN201811506829A CN109569101B CN 109569101 B CN109569101 B CN 109569101B CN 201811506829 A CN201811506829 A CN 201811506829A CN 109569101 B CN109569101 B CN 109569101B
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- 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
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
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- 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
- B01D46/0001—Making filtering elements
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- 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
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
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- 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
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
- B01D46/0036—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions by adsorption or absorption
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Abstract
The invention discloses a filter screen for an air purifier and a preparation method thereof, wherein the filter screen comprises a substrate layer and an active layer, the substrate layer is a modified foam iron net coated with a carbon microsphere coating, and the active layer is positioned outside the substrate layer; soaking the foamed iron net in a sucrose solution, and sequentially performing ultrasonic treatment, hydrothermal reaction, drying and roasting to obtain a modified foamed iron net with a carbon microsphere coating coated on the surface, namely a substrate layer; then immersing the substrate layer into a mixed solution formed by mixing titanyl sulfate, chloroplatinic acid, urea and deionized water, and sequentially carrying out hydrothermal reaction, washing, drying and roasting to obtain the TiO co-doped with Pt, N and S on the surface2A coated filter screen. According to the invention, the modified foam iron net with the carbon microsphere coating coated on the surface is formed on the foam iron net, so that the modified foam iron net has filtering and adsorbing effects, and the filter screen integrating filtering, adsorbing and catalyzing is obtained after active components are loaded, so that the air resistance is further reduced, the catalytic activity of the filter screen is improved, and the service life of the filter screen is prolonged.
Description
Technical Field
The invention belongs to the technical field of air purification, and relates to a filter screen for an air purifier and a preparation method thereof.
Background
The indoor environment is one of the most frequent and close environments, and people spend about 80-90% of the time indoors in one day, so the health of people is directly influenced by the quality of the indoor environment. Formaldehyde, toluene, PM2.5, and the like are important components of indoor air pollutants. In order to reduce the risk of indoor air health, the adoption of an air purifier is the most effective means. In the air purifier who commonly uses, the combination of HEPA and active carbon subassembly can very effectual dust, harmful gas and the bacterial microorganism of getting rid of to reach the purpose of clean air. However, the efficient filter screen and the active carbon are used for trapping pollutants on the material, and the material has respective adsorption capacity, so that desorption is easy to occur after saturated adsorption is achieved. Therefore, the greatest disadvantage of this technology is that the purification effect is reduced with time, and the filter screen of the indoor air purifier needs to be replaced after a certain time of operation, and the replaced filter screen causes secondary pollution if the filter screen cannot be properly treated. Meanwhile, the filter screen also has the defects of large filtering resistance and the like.
Aiming at the defects in the prior art, Chinese patent 201710356660.7 discloses a composite filter screen for an air purifier, which is characterized in that a stainless steel screen is processed by etching and is used as a substrate, then a silicon dioxide and/or aluminum oxide coating is coated, and active components of titanium dioxide, ammonium sulfide and bismuth tungstate are coated on the outermost layer.
Disclosure of Invention
The invention discloses a filter screen for an air purifier and a preparation method thereof, aiming at solving the defects that the existing filter screen has large filtration resistance and the precursors of an active layer are gathered and not uniformly dispersed.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
on one hand, the invention discloses a filter screen for an air purifier, which comprises a substrate layer and an active layer, wherein the substrate layer is a modified foam iron net coated with a carbon microsphere coating, the active layer is positioned outside the substrate layer, and the active layer is composed of N, S, Pt co-doped TiO2(ii) a The aperture of the filter screen is 1-1.2 mu m.
As a preferred embodiment, the method for preparing the substrate layer comprises the following steps: soaking the foamed iron net in a sucrose solution, reacting for 30-60 min under the ultrasonic condition of 200-400W to obtain a mixture, transferring the mixture into a hydrothermal reaction kettle, reacting for 4-6 h at 200-220 ℃, and cooling the hydrothermal reaction kettle to room temperature to obtain a primary modified foamed iron net with the surface coated with a carbon microsphere coating; and drying the primary modified foamed iron net at the temperature of 100-110 ℃ for 12h, and then roasting at the temperature of 480-520 ℃ for 3h in an argon atmosphere to obtain the modified foamed iron net with the surface coated with the carbon microsphere coating, namely the substrate layer. Preferably, the sucrose solution is prepared from sucrose and deionized water according to a mass-volume ratio of 0.2-0.4 g/mL, and the mass ratio of the foam iron net to the sucrose is 1: (0.05-0.15).
As a preferred embodiment, the active layer is supported to the base layer by: firstly dissolving titanyl sulfate, chloroplatinic acid and urea in an aqueous solution to prepare a mixed solution with the mass concentration of the titanyl sulfate of 3-5 wt%, and then immersing a substrate layer into the mixed solutionPutting the mixed solution into a normal pressure reaction kettle to react for 12 hours at the temperature of 90 ℃ to obtain a product with the surface coated with TiO2Washing the coated filter screen with distilled water, drying at 100-110 ℃ for 12h, roasting at 480-520 ℃ in argon atmosphere for 3h to obtain the surface of the coated filter screen which is subjected to Pt, N and S co-doped TiO2A coated filter screen.
Further, when the active layer is prepared, the amount ratio of the titanyl sulfate, the chloroplatinic acid and the urea substance is 1 (0.001-0.005) to (5-20), and preferably, the amount ratio of the titanyl sulfate, the chloroplatinic acid and the urea substance is 1:0.002: 10.
On the other hand, the invention also discloses a preparation method of the filter screen for the air purifier, which is realized by the following steps:
(1) modified foam iron net
Soaking the foamed iron net in a sucrose solution, reacting for 30-60 min under the ultrasonic condition of 200-400W to obtain a mixture, transferring the mixture into a hydrothermal reaction kettle, reacting for 4-6 h at 200-220 ℃, and cooling the hydrothermal reaction kettle to room temperature to obtain a primary modified foamed iron net with the surface coated with a carbon microsphere coating; drying the primary modified foamed iron net at the temperature of 100-110 ℃ for 12h, and then roasting at the temperature of 480-520 ℃ for 2h in an argon atmosphere to obtain a modified foamed iron net with a carbon microsphere coating coated on the surface, namely a substrate layer;
(2) active ingredient loading
Immersing the substrate layer into a mixed solution formed by mixing titanyl sulfate, chloroplatinic acid, urea and deionized water, placing the mixed solution into a normal pressure reaction kettle, and reacting for 12 hours at 90 ℃ to obtain a product with the surface coated with TiO2Washing the coated filter screen with distilled water, drying at 100-110 ℃ for 12h, roasting at 480-520 ℃ in argon atmosphere for 3h to obtain the surface of the coated filter screen which is subjected to Pt, N and S co-doped TiO2A coated filter screen.
As a preferred embodiment, in the step (1), the sucrose solution is prepared from sucrose and deionized water according to a mass-to-volume ratio of 0.2 to 0.4g/mL, and the mass ratio of the foamed iron net to the sucrose is 1: (0.05-0.15).
In a preferred embodiment, in the step (2), the amount ratio of the titanyl sulfate, chloroplatinic acid and urea is 1 (0.001-0.005) to (5-20), and the mass concentration of titanyl sulfate in the mixed solution is 3-5 wt%.
Compared with the prior art, the invention has the following beneficial effects:
1) the modified foam iron net provided by the invention can replace a traditional HEPA layer and an active carbon layer as a filter screen, so that the number of components of the purifier is reduced, the production cost is reduced, and the modified foam iron net can effectively adsorb indoor PM2.5, effectively catalyze and convert air pollutants formaldehyde and toluene, has low wind resistance and long service life;
2) the foam iron net is used as a substrate, and a layer of carbon microsphere coating is coated on the surface of the foam iron net, so that on one hand, the aperture range of the filter screen can be regulated and controlled by regulating the coating amount of the carbon microspheres, and the adsorption of PM2.5 can be enhanced; on the other hand, the coating of the carbon microspheres can effectively increase the specific surface area of the filter screen, thereby being beneficial to the loading of the active component on the surface of the filter screen;
3) uses urea as precipitant to make precursor titanyl sulfate and TiO2The form of coating on the surface of the filter screen can realize TiO2On the other hand, the uniform dispersion of Pt, N and S to active component TiO can be realized2The doping of Pt can effectively enhance the complete catalytic conversion of the filter screen to formaldehyde and toluene at room temperature, and the co-doping of N, S can improve the activity component TiO2The surface oxygen vacancy concentration of the catalyst further enhances the catalytic oxidation performance of the catalyst.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.
Example 1
1) Modification of foamed iron net
Weighing a certain amount of sucrose, dissolving the sucrose in distilled water, stirring at room temperature to completely dissolve the sucrose, then adding a foamed iron net into the solution to completely immerse the sucrose into the solution, treating the mixture for 60min under 200w of ultrasonic conditions, then integrally transferring the mixture into a hydrothermal reaction kettle, treating the mixture for 6h at 200 ℃, obtaining a modified foamed iron net with a carbon microsphere coating coated on the surface after the reaction kettle is cooled to room temperature, drying the obtained product at 105 ℃ for 12h, and roasting the dried product at 500 ℃ in argon atmosphere for 3h to obtain the modified foamed iron net; wherein the mass volume ratio of the sucrose to the deionized water is 0.4g/mL, and the weight ratio of the foam iron net to the sucrose is 1: 0.05;
2) loading of active ingredients
Dissolving titanyl sulfate, chloroplatinic acid and urea in an aqueous solution to prepare a mixed solution with the mass concentration of the titanyl sulfate of 3 wt%, immersing the modified foamed iron net in the step 1), transferring the whole into a normal pressure reaction kettle, treating at 90 ℃ for 12h, and then obtaining the product with the surface coated with TiO2Washing the coated filter screen with distilled water, drying at 105 ℃ for 12h, and roasting at 500 ℃ in argon atmosphere for 3h to obtain the surface treated by Pt, N and S co-doped TiO2A coated filter screen; wherein the mass ratio of the titanyl sulfate, the chloroplatinic acid and the urea is 1:0.002: 10; the final pore size of the resulting filter was adjusted to about 1 micron.
When the filter efficiency and the filter resistance performance of the filter screen are measured, the method is executed according to the national standard GB 2626-; the gaseous pollutant removal efficiency is performed according to the national standard GB/T18801-2008. The result shows that the PM2.5 filtering efficiency is 99.98%, the wind resistance is 28Pa, the toluene removal rate is 99.5%, and the formaldehyde removal rate is 99.9%.
Example 2
1) Modification of foamed iron net
Weighing a certain amount of sucrose, dissolving in distilled water, stirring at room temperature to completely dissolve the sucrose, adding a foam iron net into the solution to completely immerse the sucrose into the solution, treating the mixture for 30 min under 400w of ultrasonic conditions, transferring the mixture into a hydrothermal reaction kettle integrally, treating the mixture for 4h at 220 ℃, cooling the reaction kettle to room temperature to obtain a modified foam iron net with a carbon microsphere coating on the surface, drying the obtained product at 110 ℃ for 12h, and roasting the dried product at 520 ℃ in argon atmosphere for 2h to obtain the modified foam iron net; wherein the mass volume ratio of the sucrose to the deionized water is 0.2g/mL, and the weight ratio of the foam iron net to the sucrose is 1: 0.15;
2) loading of active ingredients
Dissolving titanyl sulfate, chloroplatinic acid and urea in an aqueous solution to prepare a mixed solution with the mass concentration of the titanyl sulfate of 5 wt%, immersing the modified foamed iron net in the step 1), transferring the whole into a normal pressure reaction kettle, treating at 90 ℃ for 12h, and then obtaining the product with the surface coated with TiO2Washing the coated filter screen with distilled water, drying at 100 ℃ for 12h, and roasting at 520 ℃ in argon atmosphere for 3h to obtain the surface treated by Pt, N and S co-doped TiO2A coated filter screen; wherein the mass ratio of the titanyl sulfate, the chloroplatinic acid and the urea is 1:0.001: 5; the final pore size of the obtained filter screen is regulated to be 1.2 microns.
When the filter efficiency and the filter resistance performance of the filter screen are measured, the method is executed according to the national standard GB 2626-; the gaseous pollutant removal efficiency is performed according to the national standard GB/T18801-2008. The result shows that the filtration efficiency of PM2.5 is 99.995%, the wind resistance is 40Pa, the removal rate of toluene is 99.9%, and the removal rate of formaldehyde reaches 99.95%.
Example 3
1) Modification of foamed iron net
Weighing a certain amount of sucrose, dissolving the sucrose in distilled water, stirring at room temperature to completely dissolve the sucrose, then adding a foamed iron net into the solution to completely immerse the sucrose into the solution, treating the mixture for 45 min under the ultrasonic condition of 300w, then integrally transferring the mixture into a hydrothermal reaction kettle, treating the mixture for 5h at 210 ℃, obtaining a modified foamed iron net with a carbon microsphere coating coated on the surface after the reaction kettle is cooled to room temperature, drying the obtained product at 100 ℃ for 12h, and roasting the dried product at 480 ℃ in argon atmosphere for 2h to obtain the modified foamed iron net; wherein the mass volume ratio of the sucrose to the deionized water is 0.3g/mL, and the weight ratio of the foam iron net to the sucrose is 1: 0.1;
2) loading of active ingredients
Dissolving titanyl sulfate, chloroplatinic acid and urea in an aqueous solution to prepare a mixed solution with the mass concentration of the titanyl sulfate of 4 wt%, immersing the modified foamed iron net in the step 1) in the mixed solution, and integrating the modified foamed iron netTransferring into an atmospheric pressure reaction kettle, treating at 90 deg.C for 12h, and coating TiO on the surface2Washing the coated filter screen with distilled water, drying at 105 ℃ for 12h, and roasting at 480 ℃ in argon atmosphere for 3h to obtain the surface of the coated filter screen which is subjected to Pt, N and S co-doped TiO2A coated filter screen; wherein the mass ratio of the titanyl sulfate, the chloroplatinic acid and the urea is 1:0.005: 20; the final pore size of the obtained filter screen is regulated to be 1.1 microns.
When the filter efficiency and the filter resistance performance of the filter screen are measured, the method is executed according to the national standard GB 2626-; the gaseous pollutant removal efficiency is performed according to the national standard GB/T18801-2008. The result shows that the PM2.5 filtering efficiency is 99.99 percent, the wind resistance is 35Pa, the toluene removal rate is 99.84 percent, and the formaldehyde removal rate is 99.98 percent.
Example 4
The coating step of the deactivated carbon microspheres in example 1, and the rest of the steps are the same as in example 1; the activity test result shows that the PM2.5 filtering efficiency is 60.78%, the wind resistance is 25Pa, the toluene removal rate is 79.6%, and the formaldehyde removal rate is 95.6%.
Example 5
The active component impregnation step in example 1 was performed to remove Pt from the active component, and the rest of the steps were the same as in example 1; the activity test result shows that the PM2.5 filtering efficiency is 99.97%, the wind resistance is 34Pa, the toluene removal rate is 68.2%, and the formaldehyde removal rate reaches 76.1%.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The utility model provides a filter screen for air purifier which characterized in that: comprises a substrate layer and an active layerThe substrate layer is a modified foam iron net coated with a carbon microsphere coating, the active layer is positioned outside the substrate layer and comprises Pt, N and S co-doped TiO2(ii) a The aperture of the filter screen is 1-1.2 mu m;
the preparation method of the filter screen for the air purifier is realized by the following steps:
(1) modified foam iron net
Soaking the foamed iron net in a sucrose solution, reacting for 30-60 min under the ultrasonic condition of 200-400W to obtain a mixture, transferring the mixture into a hydrothermal reaction kettle, reacting for 4-6 h at 200-220 ℃, and cooling the hydrothermal reaction kettle to room temperature to obtain a primary modified foamed iron net with the surface coated with a carbon microsphere coating; drying the primary modified foamed iron net at 100-110 ℃ for 12h, and then roasting at 580-620 ℃ in argon atmosphere for 2h to obtain a modified foamed iron net with a carbon microsphere coating coated on the surface, namely a substrate layer;
(2) active ingredient loading
Immersing the substrate layer into a mixed solution formed by mixing titanyl sulfate, chloroplatinic acid, urea and deionized water, placing the mixed solution into a normal pressure reaction kettle, and reacting for 12 hours at 90 ℃ to obtain a product with the surface coated with TiO2Washing the coated filter screen with distilled water, drying at 100-110 ℃ for 12h, roasting at 480-520 ℃ in argon atmosphere for 3h to obtain the surface of the coated filter screen which is subjected to Pt, N and S co-doped TiO2A coated filter screen.
2. The filter screen for an air cleaner according to claim 1, wherein: the preparation method of the substrate layer comprises the following steps: soaking the foamed iron net in a sucrose solution, reacting for 30-60 min under the ultrasonic condition of 200-400W to obtain a mixture, transferring the mixture into a hydrothermal reaction kettle, reacting for 4-6 h at 200-220 ℃, and cooling the hydrothermal reaction kettle to room temperature to obtain a primary modified foamed iron net with the surface coated with a carbon microsphere coating; and drying the primary modified foamed iron net at the temperature of 100-110 ℃ for 12h, and then roasting at the temperature of 480-520 ℃ for 2h in an argon atmosphere to obtain the modified foamed iron net with the surface coated with the carbon microsphere coating, namely the substrate layer.
3. The filter screen for an air cleaner according to claim 1, wherein: the active layer is loaded on the matrix layer by the following method: dissolving titanyl sulfate, chloroplatinic acid and urea in an aqueous solution to prepare a mixed solution with the mass concentration of 3-5 wt% of titanyl sulfate, then immersing a substrate layer into the mixed solution, and placing the substrate layer into a normal pressure reaction kettle to react for 12 hours at 90 ℃ to obtain a product with the surface coated with TiO2Washing the coated filter screen with distilled water, drying at 100-110 ℃ for 12h, roasting at 480-520 ℃ in argon atmosphere for 3h to obtain the surface of the coated filter screen which is subjected to Pt, N and S co-doped TiO2A coated filter screen.
4. The filter screen for an air cleaner according to claim 2, wherein: the sucrose solution is prepared from sucrose and deionized water according to a mass-volume ratio of 0.2-0.4 g/mL, and the mass ratio of the foam iron net to the sucrose is 1: (0.05-0.15).
5. The filter screen for an air cleaner according to claim 3, wherein: the mass ratio of the titanyl sulfate, the chloroplatinic acid and the urea substance is 1 (0.001-0.005) to 5-20.
6. The filter screen for an air cleaner according to claim 5, wherein: the quantity ratio of the titanyl sulfate to the chloroplatinic acid to the urea substance is 1:0.002: 10.
7. The filter screen for an air cleaner according to claim 1, wherein: in the step (1), the sucrose solution is prepared from sucrose and deionized water according to a mass-volume ratio of 0.2-0.4 g/mL, and the mass ratio of the foam iron net to the sucrose is 1: (0.05-0.15).
8. The filter screen for an air cleaner according to claim 1, wherein: in the step (2), the mass ratio of the titanyl sulfate, the chloroplatinic acid and the urea substance is 1 (0.001-0.005) to (5-20), and the mass concentration of the titanyl sulfate in the mixed solution is 3-5 wt%.
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| CN1486785A (en) * | 2003-08-12 | 2004-04-07 | 上海交通大学 | Prepn process of photocatalytic filtering net of foamed metal carrying nano Tio2 |
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| CN107308733A (en) * | 2017-05-19 | 2017-11-03 | 浙江帝恒实业有限公司 | A kind of air purifier composite screen and preparation method thereof |
| CN107597183A (en) * | 2017-10-23 | 2018-01-19 | 李俊霞 | A kind of preparation method of denitrating catalyst |
| CN108465461A (en) * | 2018-03-26 | 2018-08-31 | 江苏奥净嘉环保科技有限公司 | A kind of preparation method of photocatalysis air-cleaning material |
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| CN1486785A (en) * | 2003-08-12 | 2004-04-07 | 上海交通大学 | Prepn process of photocatalytic filtering net of foamed metal carrying nano Tio2 |
| CN102211033A (en) * | 2011-04-15 | 2011-10-12 | 中国林业科学研究院林产化学工业研究所 | Method for preparing platinum and nitrogen codoped active carbon supported titanium dioxide photocatalyst |
| CN107308733A (en) * | 2017-05-19 | 2017-11-03 | 浙江帝恒实业有限公司 | A kind of air purifier composite screen and preparation method thereof |
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