CN111715284A - Photocatalytic water treatment membrane product and preparation method thereof - Google Patents
Photocatalytic water treatment membrane product and preparation method thereof Download PDFInfo
- Publication number
- CN111715284A CN111715284A CN202010390187.6A CN202010390187A CN111715284A CN 111715284 A CN111715284 A CN 111715284A CN 202010390187 A CN202010390187 A CN 202010390187A CN 111715284 A CN111715284 A CN 111715284A
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- China
- Prior art keywords
- photocatalytic
- water treatment
- photocatalytic material
- treatment membrane
- membrane product
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
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- A—HUMAN NECESSITIES
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- A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
- A01N25/08—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests containing solids as carriers or diluents
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
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Abstract
The invention relates to the technical field of high polymer materials, and discloses a photocatalytic water treatment membrane product which comprises the following materials in percentage by mass: 1-5 wt% of a photocatalytic material, 0.5-95 wt% of a binder and 0.1-2 wt% of an auxiliary agent, and further provides a preparation method of the product, which comprises weighing, mixing, loading and drying. The obtained photocatalytic water treatment membrane has high efficiency, universality and long-acting water body purification and virus and bacteria killing performance, is beneficial to realizing the purposes of water body purification and virus and bacteria protection, is an environment-friendly material, is beneficial to ecological environment protection, reduces pollution and damage to the environment, and has good application value.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a photocatalytic water treatment membrane product and a preparation method thereof
Background
Under the action of sunlight as a driving force, the photocatalysis technology can generate strong oxidation active substances such as superoxide radical, hydroxyl radical and the like, and decompose pollutants such as dye, organic molecules, viruses, bacteria and the like in a water body, thereby playing a role in purifying the water body. The whole catalysis process of the technology is safe and nontoxic, has the characteristic of environmental protection, and is considered as the final solution of the environmental problem in the twenty-first century. However, the photocatalytic material is generally a nano powder material, and has the problem of difficult recovery when directly thrown into water for application, so that secondary pollution is easily caused to the water, and potential hidden danger also exists for the survival of aquatic animals and plants.
The prior art generally adopts a filtration mode for recovering and treating the photocatalyst, for example, a hollow ultrafiltration membrane wire is used in CN201710566322.6, the problem of difficult catalyst recovery is solved, and a treatment mode is to compound the photocatalyst and a membrane, for example, CN201611095951.7 combines the photocatalyst and the membrane to obtain a composite membrane, but the method is not suitable for industrial production.
Therefore, how to load the photocatalytic powder material on carriers of different materials such as organic polymer nets, fiber nets and the like, and simultaneously, the photocatalytic powder material has good stability in water, is not easy to fall off, has the functions of efficiently purifying water and killing viruses and bacteria, is suitable for industrial production, and is a problem to be solved at present.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a photocatalytic water treatment membrane product, which aims to solve the problems of the prior art that photocatalytic powder materials are combined with carriers made of different materials; the photocatalytic material is difficult to recover, secondary pollution is caused to water, and the obtained membrane product has the function of purifying water and is suitable for industrial production.
In order to achieve the purpose, the technical scheme provided by the invention is as follows: a photocatalysis water treatment membrane product comprises the following raw materials in percentage by mass: 1-5 wt% of photocatalytic material, 0.5-95 wt% of binder and 0.1-2 wt% of auxiliary agent.
Further, the mass percent of the photocatalytic material is 5 wt%, the mass percent of the binder is 60 wt%, and the mass percent of the auxiliary agent is 2 wt%.
Further, the photocatalytic material includes C having photocatalytic activity under visible light3N4A non-metallic photocatalytic material.
Further, the photocatalytic material comprises one or more of a nano non-metal photocatalytic material, a non-metal doped photocatalytic material, an alkaline earth metal doped photocatalytic material and a non-metal composite photocatalytic material.
Further, the nano non-metallic photocatalytic material comprises a graphite phase C3N4One or more of boron nitride, graphite phase boron carbon nitrogen, polyaniline, polypyrrole and polythiophene; the non-metallic photocatalytic materialComprises acidifying, alkalizing, and thermally stripping treated graphite phase C3N4One or more of boron nitride, graphite phase boron carbon nitrogen, polyaniline, polypyrrole and polythiophene; the non-metal doped photocatalytic material comprises one or more of nitrogen doping, carbon doping, oxygen doping, phosphorus doping and sulfur doping; the alkaline earth metal doped photocatalytic material comprises one or more of Ca, Na, K and other elements; the non-metal composite photocatalytic material comprises a non-metal composite photocatalytic material formed by compounding the non-metal photocatalytic material with one or more non-metal materials of graphene, silicon dioxide and conductive polymers.
Further, the binder is selected from one or more of silica sol, silane coupling agent and derivatives thereof, organic silicon compound, silicate such as calcium silicate and sodium silicate, conductive phenolic resin and derivatives thereof, epoxy resin and derivatives thereof, polyurethane and derivatives thereof, aqueous acrylic emulsion, acrylate and derivatives thereof.
Further, the auxiliary agent is selected from pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], tea polyphenol palmitate, octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, 1, 3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, 2, 6-di-tert-butyl-4-methylphenol, dilauryl thiodipropionate, triphenyl phosphite, phenolic antioxidants, flavonoid antioxidants, butyl hydroxyanisole, dibutyl hydroxytoluene, tert-butyl hydroquinone, vitamin E, melatonin, glutathione, vitamin C, uric acid, carotenoids and derivatives thereof, ascorbic acid, ascorbyl palmitate, isoascorbic acid, polypropylene, polyethylene grafted maleic anhydride, color master, One or more of polybutylene succinate, polyhydroxybutyrate, polycaprolactam, polyhydroxyalkanoate, polyvinyl alcohol, starch, calcium stearate, zinc stearate, stearic acid amide, paraffin wax and polyethylene wax.
The second purpose of the invention is to provide a preparation method of a photocatalytic water treatment membrane product, which comprises the following steps:
step one, weighing and mixing raw materials comprising a photocatalytic material, a binder and an auxiliary agent according to a set mass percentage to obtain a mixed raw material which is uniform photocatalytic slurry;
and step two, carrying out a surface loading process through parameter setting, loading the photocatalytic slurry on the surface of the base material, and drying to obtain the photocatalytic water treatment membrane product.
Further, the mixing mode adopts one or more of ultrasonic dispersion, mechanical stirring and ball milling.
Further, the surface loading process comprises one or more of spraying, soaking, coating and screen printing, and the photocatalytic slurry is loaded on the surface of the substrate through the surface loading process.
Further, before the second step, the method further comprises:
and pretreating the substrate by one of acid treatment, alkali treatment, heat treatment and water treatment.
Further, the substrate comprises one or more of cotton, glass fiber, ceramic plate, ceramic fiber, polymer net and metal net.
Has the advantages that:
the photocatalytic water treatment membrane product provided by the invention can realize water purification through sunlight and lamplight, and the photocatalytic powder material does not fall off in the using process and has the characteristic of environmental protection; the photocatalytic water treatment membrane has a decomposition function on organic molecules in the water body, and can continuously purify the water body; has strong antivirus and antibacterial properties, and can avoid the propagation and breeding of viruses and bacteria in water.
The water treatment membrane material has high efficiency, broad spectrum, long effect and safe water body purification function and antibacterial function, can be applied to large-scale water body purification, and has wide application prospect for environmental protection on the basis of not changing the traditional water treatment membrane production process.
Drawings
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
FIG. 1 is a flow chart of a method of making a photocatalytic water treatment membrane article of the present invention.
Detailed Description
The numerical values set forth in the examples of the present invention are approximations, not necessarily values. All values within the error range may be included without limiting to the specific values disclosed in the embodiments of the present invention, where the error or experimental conditions allow.
The numerical ranges disclosed in the examples of the present invention are intended to indicate the relative amounts of the components in the mixture and the ranges of temperatures or other parameters recited in the other method examples.
As shown in fig. 1, the preparation method of the photocatalytic water treatment membrane product comprises the following steps:
110. weighing and mixing various raw materials according to the set mass percentage, and forming uniform photocatalytic slurry by the mixed raw materials.
In this embodiment, the raw materials include a photocatalytic material, a binder, and an auxiliary agent, and the mass percentage ranges set for each raw material are: 1-5 wt% of a photocatalytic material, 0.5-95 wt% of a binder and 0.1-2 parts of an auxiliary agent.
The added photocatalytic material can provide long-time water body purification and anti-virus bacteria functions for the photocatalytic water treatment membrane product, and is used for decomposing water body pollutants and killing bacteria and viruses such as escherichia coli, staphylococcus aureus and the like in the water body.
The photocatalytic material can be one or more of a nano non-metal photocatalytic material, a non-metal doped photocatalytic material, an alkaline earth metal doped photocatalytic material and a non-metal composite photocatalytic material.
The nano non-metal photocatalytic material comprises a graphite phase C3N4One or more of boron nitride, graphite phase boron carbon nitrogen, polyaniline, polypyrrole and polythiophene; the non-metallic photocatalytic material comprises a graphite phase C after acidification, alkalization, thermal stripping and other treatments3N4Boron nitride, boron nitrideOne or more of graphite phase boron carbon nitride, polyaniline, polypyrrole and polythiophene; the non-metal doped photocatalytic material comprises one or more of nitrogen doping, carbon doping, oxygen doping, phosphorus doping and sulfur doping; the alkaline earth metal doped photocatalytic material comprises one or more of Ca, Na, K and other elements; the non-metal composite photocatalytic material comprises a non-metal composite photocatalytic material formed by compounding the non-metal photocatalytic material with one or more non-metal materials of graphene, silicon dioxide and conductive polymers.
Specifically, when the non-metal photocatalytic material is selected as the photocatalytic material, the photocatalytic material can show catalytic activity under illumination of specific wavelength and has good water body purification function and antiviral and antibacterial properties.
The photocatalytic material has photocatalytic activity under visible light, and provides a photocatalytic material with long-term high-efficiency purification and antiviral bacteria capacity, and the photocatalytic material has higher solar energy utilization rate (the visible light is 400-750 nm, and accounts for 43% of sunlight energy) and higher catalytic activity.
In an embodiment, carbon nitride may be selected as the non-metal photocatalytic material, and the test performance when carbon nitride is selected as the photocatalytic material is as follows: after 10 hours of irradiation of 30w of an incandescent lamp, the degradation efficiency of rhodamine B dye reaches 100%, the killing efficiency of escherichia coli and staphylococcus aureus after 24 hours of irradiation is 86% and 93%, respectively, with the use time of 20 days, the degradation efficiency of rhodamine B is still 80%, and the killing efficiency of escherichia coli and staphylococcus aureus is 82% and 90%, respectively.
In one embodiment, the nano-nonmetal photocatalytic material can be selected from graphite phase C3N4One or more of boron nitride, graphite phase boron carbon nitrogen, polyaniline, polypyrrole and polythiophene; the non-metallic photocatalytic material comprises a graphite phase C after acidification, alkalization, thermal stripping and other treatments3N4One or more of boron nitride, graphite phase boron carbon nitrogen, polyaniline, polypyrrole and polythiophene; the non-metal doped photocatalytic material can be nitrogen-doped or carbon-dopedOne or more of doping, oxygen doping, phosphorus doping, sulfur doping; the alkaline earth metal doped photocatalytic material can be one or more of Ca, Na, K and other elements; the non-metal composite photocatalytic material can be formed by compounding a non-metal photocatalytic material with one or more non-metal materials selected from graphene, silicon dioxide and conductive polymers.
In one embodiment, the binder is selected from one or more of silica sol, silane coupling agent and its derivatives, organosilicon compound, silicate such as calcium silicate and sodium silicate, conductive phenolic resin and its derivatives, epoxy resin and its derivatives, polyurethane and its derivatives, aqueous acrylic emulsion, acrylate and its derivatives.
In one embodiment, the adjuvant is selected from pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], tea polyphenol palmitate, stearyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, 1, 3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, 2, 6-di-tert-butyl-4-methylphenol, dilauryl thiodipropionate, triphenyl phosphite, phenolic antioxidants, flavonoid antioxidants, butyl hydroxyanisole, dibutyl hydroxytoluene, tert-butyl hydroquinone, vitamin E, melatonin, glutathione, vitamin C, uric acid, carotenoids and derivatives thereof, ascorbic acid, ascorbyl palmitate, isoascorbic acid, polypropylene, polyethylene grafted maleic anhydride, color masterbatch, One or more of polybutylene succinate, polyhydroxybutyrate, polycaprolactam, polyhydroxyalkanoate, polyvinyl alcohol, starch, calcium stearate, zinc stearate, stearic acid amide, paraffin wax and polyethylene wax.
The mixture obtained by mixing the materials is photocatalytic slurry, the mixing mode can adopt mixing methods such as ultrasonic dispersion, mechanical stirring, ball milling and the like, and the obtained mixture has appropriate physicochemical properties, such as good enough uniformity, so as to meet the requirements of subsequent processing technology.
120. And carrying out a surface loading process, loading the photocatalytic slurry on the surface of the base material, and drying to obtain the photocatalytic water treatment membrane product.
Specifically, the surface loading process may adopt one or more of surface spraying, soaking, coating and screen printing processes. The substrate can be one or more of cotton-flax products, glass fibers, ceramic plates, ceramic fibers, polymer nets and metal nets. And the base material is pretreated by acid treatment, alkali treatment, heat treatment, water treatment and the like to remove surface impurities.
The preparation method of the photocatalytic water treatment product provided by the embodiment has the characteristics of easily available raw materials, simple process and wide application range. The photocatalytic water treatment product is environment-friendly, can realize the degradation of water pollutants under the oxidation action of photocatalysis, is beneficial to the protection of ecological environment, has no pollution to the environment and has the characteristic of environmental protection; has strong virus and bacteria killing function, and can inhibit the propagation of virus and the breeding of bacteria in water; the preparation condition is mild and simple, the equipment requirement is low, the industrial production is easy to realize, and the method can be widely applied to the technical field of water body treatment.
In a preferred embodiment, when 5 wt% of the photocatalytic material, 60 wt% of the binder and 2 wt% of the auxiliary agent are used as raw materials to prepare the photocatalytic water treatment membrane product by mixing, the optimal balance among the anti-virus bacterial performance, the water body purification performance and the use performance of the photocatalytic water treatment membrane can be achieved.
In some embodiments, the surface loading of the mixture on the substrate of different materials by the set processing technology may specifically include the following steps:
firstly, the mixture is loaded into an air pump device, then the mixture slurry is evenly sprayed on the surface of the polyethylene water treatment membrane, and finally the photocatalytic water treatment membrane is dried at room temperature.
Based on the preparation method of the photocatalytic water treatment membrane provided by the embodiment of the invention, a plurality of specific preparation examples are provided below to fully and specifically illustrate the specific preparation process of the photocatalytic water treatment membrane.
Example 1:
g-C3N45 wt% of the compound;
60 wt% of water-based acrylic emulsion;
2 wt% of an auxiliary agent;
2) preparing the weighed raw materials into a solution, and mixing to form a mixture;
3) charging the mixture into a soaking apparatus;
4) soaking the fiber web in the mixture for 0.5 hour;
5) drying the soaked photocatalytic water treatment membrane in a natural environment;
wherein, the cotton-flax mesh fabric is pretreated by water and dried at normal temperature to remove surface impurities.
Example 2:
C/g-C3N44 wt% of polyaniline compound;
5 wt% of calcium silicate;
2 wt% of an auxiliary agent;
2) preparing the weighed raw materials into a solution, and mixing to form a mixture;
3) charging the mixture into a soaking apparatus;
4) soaking the cotton-flax mesh cloth in the mixture for 2 hours;
5) drying the soaked photocatalytic water treatment membrane in a natural environment;
wherein, the cotton-flax mesh fabric is pretreated by water and dried at 80 ℃ to remove surface impurities.
Example 3:
C/g-C3N45 wt% of polythiophene complex;
93 wt% of sodium silicate;
2 wt% of an auxiliary agent;
2) preparing the weighed raw materials into a solution, and mixing to form a mixture;
3) charging the mixture into a soaking apparatus;
4) soaking the cotton and linen mesh cloth in the mixture for 1 h;
5) drying the soaked photocatalytic water treatment membrane in a natural environment;
wherein, the cotton-flax mesh fabric is pretreated by water and dried at 80 ℃ to remove surface impurities.
Example 4:
SiO2/g-C3N45 wt% of the compound;
95 wt% of sodium silicate;
2 wt% of an auxiliary agent;
2) preparing the weighed raw materials into a solution, and mixing to form a mixture;
3) charging the mixture into a soaking apparatus;
4) soaking the web in the mixture for 1.5 hours;
5) drying the soaked photocatalytic water treatment membrane in a natural environment;
wherein, the cotton-flax mesh fabric is pretreated by water and dried at normal temperature to remove surface impurities.
Example 5:
1) weighing the following raw materials in percentage by mass:
C/g-C3N41wt％；
0.5 wt% of calcium silicate;
0.1 wt% of auxiliary agent;
2) preparing the weighed raw materials into a solution, and mixing to form a mixture;
3) loading the mixture into a spray device;
4) uniformly spraying the mixture on the surface of a polypropylene polymer fiber membrane;
5) drying the sprayed photocatalytic water treatment membrane in a natural environment;
wherein, the polypropylene polymer fiber membrane is pretreated by water to remove surface impurities.
The antibacterial test result of the photocatalytic water treatment membrane obtained in the above embodiment is as follows:
the photocatalytic water treatment membrane obtained in the embodiment 1 has an antibacterial rate of 85% for escherichia coli and 96.9% for staphylococcus aureus under a 24-hour visible light illumination condition, and the antibacterial rates of the escherichia coli and the staphylococcus aureus still reach 81% and 90% respectively after 25 days of testing; the experimental test data of examples 2 to 5 fluctuated on the basis of example 1, and the range of the antibacterial ratio thereof was as shown in table 1.
TABLE 1 variation of antibacterial Rate of the materials
The experimental data show that the obtained material has high-efficiency antibacterial property for escherichia coli, staphylococcus aureus and the like, and still has high-efficiency antibacterial property and cyclicity after a long time, and the material can keep the long-acting antibacterial property.
The photocatalytic water treatment membrane product obtained by the five embodiments has excellent water body purification function and antiviral and antibacterial properties, can degrade dyes such as rhodamine B, methyl blue and the like, can kill bacteria such as staphylococcus aureus, escherichia coli and the like, can kill viruses such as H1N1 and the like, and has no pollution to the environment.
In conclusion, the photocatalytic water treatment membrane product provided by the embodiment of the invention has the characteristics of easily available raw materials, simple process, various selectable base materials, safety, environmental protection, and large-scale practical production and application. The visible light photocatalytic material decomposes water pollutants under the catalysis of the visible light photocatalytic material, kills bacteria and viruses such as staphylococcus aureus, escherichia coli, H1N1 influenza virus and the like in water, has the characteristics of continuous purification function and capability of killing bacteria and viruses, has the characteristics of safety and environmental protection, and has important application value.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (11)
1. A photocatalytic water treatment membrane product is characterized by comprising the following raw materials in percentage by mass:
1-5 wt% of a photocatalytic material;
0.5-95 wt% of binder;
0.1-2 wt% of auxiliary agent.
2. A photocatalytic water treatment membrane article as set forth in claim 1, wherein the photocatalytic material comprises C having photocatalytic activity under visible light3N4A non-metallic photocatalytic material.
3. A photocatalytic water treatment membrane product as set forth in claim 1, wherein the photocatalytic material comprises one or more of a nano-nonmetal photocatalytic material, a nonmetal-doped photocatalytic material, an alkaline earth metal-doped photocatalytic material, and a nonmetal composite photocatalytic material.
4. A photocatalytic water treatment membrane product as set forth in claim 3, wherein the nano non-metallic photocatalytic material comprises graphite phase C3N4One or more of boron nitride, graphite phase boron carbon nitrogen, polyaniline, polypyrrole and polythiophene; the nano non-metal photocatalytic material comprises a graphite phase C after acidification, alkalization, thermal stripping and other treatments3N4One or more of boron nitride, graphite phase boron carbon nitrogen, polyaniline, polypyrrole and polythiophene; the non-metal doped photocatalytic material comprises one or more of nitrogen doping, carbon doping, oxygen doping, phosphorus doping and sulfur doping; the alkaline earth metal doped photocatalytic material comprises one or more of Ca, Na and K elements; the non-metal composite photocatalytic material comprises a non-metal composite formed by compounding the non-metal photocatalytic material with one or more non-metal materials of graphene, silicon dioxide and conductive polymerA photocatalytic material.
5. A photocatalytic water treatment membrane product as defined in claim 1, wherein the binder is selected from one or more of silica sol, silane coupling agent and its derivatives, organosilicon compound, silicate such as calcium silicate and sodium silicate, conductive phenolic resin and its derivatives, epoxy resin and its derivatives, polyurethane and its derivatives, aqueous acrylic emulsion, acrylate and its derivatives.
6. A photocatalytic water treatment membrane product as set forth in claim 1, characterized in that the auxiliary agent is selected from pentaerythritol tetrakis [ β - (3, 5-di-tert-butyl 4 hydroxyphenyl) propionate ], tea polyphenol palmitate, stearyl β - (3, 5-di-tert-butyl 4 hydroxyphenyl) propionate, 1, 3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, 2, 6-di-tert-butyl-4-methylphenol, dilauryl thiodipropionate, triphenyl phosphite, phenolic antioxidants, flavonoid antioxidants, butyl hydroxyanisole, dibutylhydroxytoluene, tert-butylhydroquinone, vitamin E, melatonin, glutathione, vitamin C, uric acid, carotenoids and derivatives thereof, ascorbic acid, ascorbyl palmitate, One or more of isoascorbic acid, polypropylene, polyethylene grafted maleic anhydride, color master, polybutylene succinate, polyhydroxybutyrate, polycaprolactam, polyhydroxyalkanoate, polyvinyl alcohol, starch, calcium stearate, zinc stearate, stearic acid amide, paraffin wax and polyethylene wax.
7. A photocatalytic water treatment membrane product as set forth in any one of claims 1 to 6, wherein the photocatalytic material is 5 wt%, the binder is 60 wt%, and the auxiliary is 2 wt%.
8. A method for preparing a photocatalytic water treatment membrane product as set forth in any one of claims 1 to 7, comprising the steps of:
step one, weighing and mixing raw materials comprising a photocatalytic material, a binder and an auxiliary agent according to a set mass percentage to obtain a mixed raw material which is uniform photocatalytic slurry;
and step two, carrying out a surface loading process, loading the photocatalytic slurry on the surface of the base material, and drying to obtain the photocatalytic water treatment membrane product.
9. The method as recited in claim 8, wherein the mixing in step one is performed by one or more of ultrasonic dispersion, mechanical stirring, and ball milling.
10. The method for preparing a photocatalytic water treatment membrane product as recited in claim 8, wherein the surface loading process in the second step comprises one or more of spraying, soaking, coating and screen printing, and the photocatalytic slurry is loaded on the surface of the substrate through the surface loading process.
11. A method of making a photocatalytic water treatment membrane article as set forth in any of claims 8-10, further comprising before step two:
and pretreating the substrate by one of acid treatment, alkali treatment, heat treatment and water treatment.
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