Multifunctional oil-water separation and purification material with photocatalytic degradation performance as well as preparation method and application of multifunctional oil-water separation and purification material

Abstract

The invention relates to the field of water body oil pollution treatment, in particular to a multifunctional oil-water separation and purification material with photocatalytic degradation performance as well as a preparation method and application of the multifunctional oil-water separation and purification material. The preparation method comprises the following steps: soaking sponge in a dopamine buffer solution for self-polymerization reaction to obtain sponge 1; the sponge 1 is soaked in a mixed solution for a reaction, and sponge 2 is obtained; the mixed solution comprises a silicon source, ammonia water and carbon nanotubes; dipping the sponge 2 in a zinc source solution, adding an alkali solution for reaction, and then adding a silver source solution for reaction to obtain sponge 3; the sponge 3 is dried and then placed in a hydrophobic modified solution to be soaked, and the multifunctional oil-water separation and purification material with the photocatalytic degradation performance is obtained. The multifunctional oil-water separation and purification material disclosed by the invention has the characteristics of low manufacturing cost, high oil-water separation efficiency, high degradation efficiency on soluble organic pollutants, small secondary pollution and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of water body oil pollution treatment, in particular to a multifunctional oil-water separation and purification material with photocatalytic degradation performance and a preparation method and application thereof. BACKGROUND

[0002] Petroleum or petroleum products are widely used in social production and daily life as indispensable resources for the development of industrial society. However, there is a hidden danger of entering the environment in the whole production cycle of petroleum, such as mining, transportation, processing and utilization. The oil and petroleum products entering the environment will enter the water body for various reasons, which not only causes waste of oil resources, but also seriously pollutes the water quality of the water body, causing great disaster to aquatic organisms and even human health. And once the oily sewage penetrates below the soil, it will cause irreversible crisis to the underground water resources on which human beings depend. Therefore, the method of both efficiently treating oily sewage and recycling oil resources has attracted the attention of researchers. Traditional methods for treating oily sewage include gravity separation, centrifugal separation, combustion, physical adsorption and the like. The gravity method can only simply treat oil-water mixture, and has great limitations for treating complex oily wastewater; the centrifugal method has limitations in treatment capacity due to its own size and design, and consumes a large amount of energy; the combustion method not only wastes a large amount of oil resources, but also causes secondary pollution to the environment.

[0003] The physical adsorption method can recycle oil resources while purifying water quality by using adsorption mechanism, and the cost of recycling and purification is low, so it has attracted widespread attention in recent years. However, the previous physical adsorption materials such as activated carbon, zeolite molecular sieve, foam, aerogel and sponge have no selective adsorption of oil and water, and the oil-water adsorption and separation efficiency of most materials is only about 50%, which leads to low recycling and purification efficiency. Therefore, it is urgent to find and develop new adsorption materials with high selective oil-water adsorption. Sponge is an ideal substrate material for oil-water adsorption and separation and purification due to its low density, developed three-dimensional cross-linked network and low price. However, the existing ordinary sponge has no selective adsorption of oil and water, and the separation efficiency and mechanical strength still cannot meet the needs of most application scenarios. In order to meet the needs of application, it is necessary to greatly improve the selective adsorption and separation efficiency and mechanical strength of the sponge-based material, and further research and development is needed. In addition, oily sewage often has complex composition and contains various soluble organic pollutants, and single-function oil-water separation materials have far failed to meet the needs of actual sewage purification. Therefore, it is of great practical significance to develop multifunctional oil-water separation and purification materials with selective oil-water separation and degradation of soluble organic pollutants. SUMMARY

[0004] The application aims to provide a multifunctional oil-water separation and purification material with photocatalytic degradation performance and a preparation method and application thereof.

[0005] To achieve the above-mentioned purpose, the application provides the following solutions. One of the technical solutions of the application is a preparation method of a multifunctional oil-water separation and purification material with photocatalytic degradation performance, comprising the following steps. Step 1, the sponge is immersed in a dopamine buffer solution for self-polymerization reaction to obtain sponge 1; Step 2, the sponge 1 is immersed in a mixed solution for reaction to obtain sponge 2; the mixed solution comprises a silicon source, ammonia water and carbon nanotubes; Step 3, the sponge 2 is immersed in a zinc source solution and an alkali solution is added for reaction, and then a silver source solution is added for reaction to obtain sponge 3; Step 4, the sponge 3 is dried and then immersed in a hydrophobic modification solution to obtain the multifunctional oil-water separation and purification material with photocatalytic degradation performance.

[0006] The application uses polydopamine as an in-situ site to anchor SiO2 to enhance the mechanical strength of the sponge, simultaneously uses the chelation of polydopamine to combine with the photocatalytic technology to enhance the sponge surface to chelate two kinds of particles with a large energy level difference, and uses perfluorooctyltriethoxysilane (POTS) to modify the surface energy, thereby designing a high-strength superhydrophobic / superoleophilic multifunctional oil-water separation and purification material with photocatalytic degradation performance, which well solves the problems of low separation efficiency, poor mechanical strength and no degradation of soluble organic pollutants of the previous oil-water separation materials.

[0007] The second technical solution of the application is a multifunctional oil-water separation and purification material with photocatalytic degradation performance prepared according to the above-mentioned preparation method.

[0008] The third technical solution of the application is the application of the above-mentioned multifunctional oil-water separation and purification material with photocatalytic degradation performance in oil-water separation.

[0009] The fourth technical solution of the application is the application of the above-mentioned multifunctional oil-water separation and purification material with photocatalytic degradation performance in photocatalytic degradation of organic pollutants.

[0010] The application discloses the following technical effects: The multifunctional oil-water separation and purification material has the characteristics of low manufacturing cost, high oil-water separation efficiency, high degradation efficiency of soluble organic pollutants and small secondary pollution, and is very suitable for collecting and treating resource waste caused by oil pollution leakage and water body organic pollution. BRIEF DESCRIPTION OF DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below only show some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0012] Figure 1 In the figure (a) is the picture of the wettability of the surface of the unmodified polyurethane sponge to water and oil, (b) is the picture of the wettability of the surface of the un-oil-modified reinforced sponge in Comparative Example 1 to water and oil, (c) is the picture of the wettability of the surface of the multifunctional oil-water separation and purification material in Example 1 to water and oil, and (d) is the size of the water and oil contact angle of the surface of the multifunctional oil-water separation and purification material in Example 1.

[0013] Figure 2 In the figure (a) is the emulsified oil separation efficiency of the multifunctional oil-water separation and purification material in Example 1 to various oils and organic solvents (in the horizontal coordinate, DCM is dichloromethane, EA is ethyl acrylate, Kerosene is kerosene, Xylene is xylene, CYH is cyclohexane, PE is phenol, and TCM is chloroform; in the vertical coordinate, the separation efficiency), and (b) is the separation efficiency of the emulsified oil-water mixture (in the horizontal coordinate, the number of cyclic separation, in the vertical coordinate, the oil-water separation efficiency, PE is phenol, DCM is dichloromethane, and TCM is chloroform).

[0014] Figure 3 In the figure (a) is the photodegradation efficiency of the multifunctional oil-water separation and purification material in Example 1 to four kinds of organic pollutants (MB is methylene blue, MG is malachite blue, ZH is safflower, and IN is indigo), and (b) is the cyclic degradation efficiency of the multifunctional oil-water separation and purification material in Example 1 to methylene blue.

[0015] Figure 4 In the figure (a) is the strain curve of the PU sponge (i.e. the unmodified polyurethane sponge), the PU / PDA sponge, the PU / PDA / SiO2 sponge, and the PU / PDA / SiO2@H-CNTs sponge under the maximum deformation of 60%, and (b) is the stress-strain curve of the PU / PDA / SiO2@H-CNTs sponge after 100 adsorption cycles. DETAILED DESCRIPTION

[0016] The various exemplary embodiments of the present application will now be described in detail, which should not be considered as limiting the present application, but should be understood as a more detailed description of some aspects, characteristics and embodiments of the present application.

[0017] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. In addition, where a range of values is provided, it is understood that each intervening value, to the upper and lower limit of that range is also specifically disclosed. Each smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in that stated range is encompassed. The upper and lower limits of these smaller ranges can independently be included or excluded in the range.

[0018] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Although preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present application. All documents mentioned herein are incorporated by reference to disclose and describe the methods and / or materials in connection with which the documents are cited. In case of conflict, the present specification will control.

[0019] Various modifications and changes can be made to the specific embodiments of the present application described herein without departing from the scope or spirit of the application. Other embodiments of the application will be apparent to those of ordinary skill in the art from the description and examples herein. The description and examples are illustrative only.

[0020] As used herein, the terms "comprises", "comprising", "includes", "including", "has", "having", and the like are open-ended terms that are intended to mean including, but not limited to.

[0021] In order to overcome the shortcomings of low separation efficiency and mechanical strength and the lack of degradation of soluble organic pollutants of the existing oil-water separation materials, the application innovatively uses polydopamine as an in-situ anchor to enhance the mechanical strength of SiO2 generated in the sol process, and uses the chelation of polydopamine and the photocatalysis technology to combine two particles with a large energy level difference on the surface of the polyurethane sponge, and then modify the surface energy with POTS, to design a high-strength superhydrophobic / superoleophilic polyurethane sponge with photocatalytic degradation performance (i.e. multifunctional oil-water separation purification material), which well solves the problems of low separation efficiency, poor mechanical strength, and lack of degradation of soluble organic pollutants of the previous oil-water separation materials. Once the new material is popularized and used, it will effectively improve the efficiency and service life of the oil-water separation material, and produce good economic, environmental and social benefits.

[0022] The first aspect of the application provides a preparation method of a multifunctional oil-water separation purification material with photocatalytic degradation performance, comprising the following steps: Step 1, the sponge is immersed in a dopamine buffer solution for self-polymerization reaction to obtain sponge 1; Step 2, the sponge 1 is immersed in a mixed solution to react, to obtain sponge 2; the mixed solution comprises a silicon source, ammonia and carbon nanotubes; Step 3, the sponge 2 is immersed in a zinc source solution and an alkali solution is added to react, and then a silver source solution is added to react, to obtain sponge 3; Step 4, the sponge 3 is dried and then immersed in a hydrophobic modification solution to obtain the multifunctional oil-water separation and purification material with photocatalytic degradation performance.

[0023] In a preferred embodiment of the present application, in step 1, before the sponge is immersed in the dopamine buffer solution, the sponge is subjected to a cleaning and drying step; the sponge is a polyurethane sponge; the concentration of the dopamine buffer solution is 30-50 g / L; the temperature of the self-polymerization reaction is 35-50℃, the pH is 7-8, and the reaction time is 20-30 min.

[0024] The source of the polyurethane sponge is not particularly limited in the present application, and can be obtained by a commercial route, for example.

[0025] In a preferred embodiment of the present application, in step 2, the volume ratio of the silicon source, ammonia and carbon nanotubes is 2:2:1; the mass fraction of the ammonia is 20%-50%.

[0026] In a preferred embodiment of the present application, in step 2, the temperature of the reaction is 35-50℃, and the time is 20-30 min.

[0027] In a preferred embodiment of the present application, in step 3, the zinc source solution is a zinc nitrate solution with a concentration of 14.8-20 g / L; the alkali solution is a sodium hydroxide solution with a concentration of 20-25 g / L; the silver source solution is a silver nitrate solution with a concentration of 25.5 g / L; the volume ratio of the zinc source solution to the alkali solution and silver source solution is 3:3:1.

[0028] In a preferred embodiment of the present application, in step 3, the temperature for adding the alkali solution to react is 25-40℃, and the time is 2 h; the conditions for adding the silver source solution to react are set as follows: stirring for 2 h in a dark environment and then irradiation for 2 h under ultraviolet light.

[0029] In a preferred embodiment of the present application, in step 4, the hydrophobic modification solution is a perfluorooctyltriethoxysilane solution with a volume fraction of 60%-80%, and the solvent is chloroform; in step 4, the temperature for immersion is 25-40℃, and the time for immersion is 20-30 min.

[0030] The present application provides a multifunctional oil-water separation and purification material with photocatalytic degradation performance prepared by the above preparation method.

[0031] The third aspect of the present application provides the application of the multifunctional oil-water separation and purification material with photocatalytic degradation performance in oil-water separation.

[0032] The fourth aspect of the present application provides the application of the multifunctional oil-water separation and purification material with photocatalytic degradation performance in photocatalytic degradation of organic pollutants.

[0033] The technical solution adopted by the present application to solve the technical problems is: (1) a large number of active sites and anchoring points are generated on the sponge surface by self-polymerization of dopamine, and SiO2 particles and carbon nanotube particles generated by tetraethyl orthosilicate (TEOS) under the catalysis of ammonia are anchored on the sponge surface in situ, and the self-polymerization of dopamine and the sol-gel process can enhance the interface strength of the sponge surface and the particles, thereby enhancing the firmness of the particles on the sponge surface and the mechanical strength of the sponge itself, and the SiO2 particles and carbon nanotube particles on the sponge surface can also increase the micro-roughness of the sponge surface, providing a microstructure basis for subsequent hydrophobic modification. (2) The chelation of two kinds of nano-silver particles and nano-ZnO particles with large difference in vacuum energy level is carried out in situ by using the chelation points generated by the self-polymerization of dopamine on the sponge surface, so as to make the particles have photocatalytic degradation performance on soluble organic pollutants in water, and a Schottky barrier is constructed by using the difference in vacuum energy level of the particles, so as to reduce the recombination rate of photo-generated electrons and holes, thereby improving the photocatalytic degradation efficiency. (3) The sponge is hydrophobically modified by fluorosilane, so that the sponge has super-hydrophobic / super-oil-wetting performance, and has high oil-water separation capacity and oil resource capture capacity.

[0034] The main technical features of the present application are: (1) the self-polymerization characteristics of dopamine are used to generate a large number of active sites and anchoring points on the surface of the polyurethane sponge, while enhancing the mechanical strength of the sponge and the firmness of the particles on the sponge surface, compared with the previous oil-water separation materials, the mechanical strength is higher, and the service life is longer. (2) Compared with the existing oil-water separation materials, the multifunctional oil-water separation and purification material has photocatalytic degradation performance on soluble organic pollutants. (3) Compared with the previous photocatalytic materials, a Schottky barrier is constructed due to the difference in vacuum energy level of the particles, which reduces the recombination rate of photo-generated electrons and holes, and has higher photocatalytic degradation efficiency. (4) Compared with the existing oil-water separation materials, the multifunctional oil-water separation and purification material has higher oil-water separation efficiency.

[0035] The technical solution of the present application, if not specified, is a conventional solution in the art, and the reagents or raw materials used, if not specified, are purchased from commercial channels or are already disclosed.

[0036] The carbon nanotubes used in the embodiments of the present application are purchased from Beijing Carbon Sunshine Technology Co., Ltd., and are hydroxyl carbon nanotubes with a pore size of less than or equal to 2 nm.

[0037] The technical solutions provided by the present application are described in detail below in conjunction with examples, but they should not be understood as limiting the scope of protection of the present application.

[0038] Example 1: Preparation of multifunctional oil-water separation and purification material Step 1: The polyurethane sponge (abbreviation: sponge) was cleaned with deionized water and ethanol for 3 times to remove the impurities on the surface, and the cleaned sponge was dried in an oven at 80°C. The dried sponge (2cm*2cm*2cm) was placed in a Tris buffer solution containing 40g / L dopamine (pH 7) at 40°C for 25min to make dopamine self-polymerize on the surface of the sponge to generate a large number of active sites.

[0039] Step 2: The sponge obtained in step 1 was treated with a mixture of tetraethyl orthosilicate (TEOS), 30% ammonia water and carbon nanotubes (the volume ratio of tetraethyl orthosilicate, ammonia water and carbon nanotubes was 2:2:1), and the silica generated under the catalysis of tetraethyl orthosilicate (TEOS) in ammonia water and the carbon nanotubes were anchored on the surface of the sponge in situ by the active sites on the sponge.

[0040] Step 3: The sponge obtained in step 2 was immersed in 30mL of a zinc nitrate (Zn(NO3)2·6H2O) solution with a mass concentration of 14.8g / L (solvent: water) in a water bath at 55°C, while 30mL of a sodium hydroxide solution with a mass concentration of 20g / L was added dropwise, and the stirring was continued for 2h, so that the generated zinc oxide (ZnO) was chelated on the surface of the sponge. Then, 10mL of a silver nitrate (AgNO3) solution with a mass concentration of 25.5g / L (solvent: water) was added dropwise to the above stirred solution, and the whole stirring device was placed in a dark environment using a light shielding box and continued to be stirred for 2h, and then irradiated under ultraviolet light for 2h, so that the nano-silver particles generated in the photo-reduction process were chelated on the surface of the sponge.

[0041] Step 4: The sponge obtained in step 3 was dried in an oven at 80°C, and then immersed in a perfluorooctyltriethoxysilane solution (solvent: chloroform) at 35°C for 25min to modify the hydrophobicity of the sponge, thereby obtaining a multifunctional oil-water separation and purification material (denoted as: PU / PDA / SiO2@H-CNTs).

[0042] Comparative Example 1: Preparation of reinforced structure sponge without lipophilic modification The difference between Example 1 and Comparative Example 1 is only that the step of "immersing in a perfluorooctyltriethoxysilane solution (solvent: chloroform) at 35°C for 25min to modify the hydrophobicity of the sponge" in step 4 is omitted.

[0043] Comparative Example 2 The difference from Example 1 is only that step 2 is omitted; the sponge prepared is recorded as PU / PDA.

[0044] Comparative Example 3 The difference from Example 1 is only that the addition of carbon nanotubes in step 2 is omitted; the sponge prepared is recorded as PU / PDA / SiO2.

[0045] The oil-water separation purification materials prepared in the examples and comparative examples are verified for effect, as follows: 1、 Figure 1 (a) is the picture of the wettability of the surface of the unmodified polyurethane sponge to water and oil, (b) is the picture of the wettability of the surface of the unmodified reinforced sponge to water and oil in Comparative Example 1, (c) is the picture of the wettability of the surface of the multifunctional oil-water separation purification sponge to water and oil in Example 1, and (d) is the water and oil contact angle of the surface of the multifunctional oil-water separation purification sponge in Example 1. Figure 1 It can be seen that the unmodified polyurethane sponge (commercial sponge) exhibits amphiphilicity to water and oil, but is not superamphiphilic (a). Figure 1 The amphiphilicity to water and oil makes it difficult for the commercial sponge to achieve selective oil-water separation. Subsequently, a layer of polydopamine film is modified on the surface of the sponge by using the self-polymerization of dopamine as a secondary reaction platform. The platform can anchor the SiO2 particles generated in the sol-gel process in situ on the surface of the sponge, and further introduces H-CNTs to provide a multi-level structure and serve as needle-like demulsification tips. At this time, the sponge is completely converted into a superamphiphilic state (b). Figure 1 Finally, the sponge surface exhibits excellent asymmetric wettability (c) after low surface energy modification by POTS. Figure 1 The water contact angle of the sponge surface reaches 156.0±1.4°, and the oil contact angle is 0° (d). Figure 1

[0046] 2、 Figure 2 (a) is the separation efficiency of the multifunctional oil-water separation purification material in Example 1 to various oils and organic solvents (oil-water volume ratio is 1:99, at room temperature) (DCM is dichloromethane, EA is ethyl acrylate, Kerosene is kerosene, Xylene is xylene, CYH is cyclohexane, PE is phenol, and TCM is chloroform; the abscissa is the separation efficiency, and the ordinate is the separation efficiency), and (b) is the separation efficiency of the emulsified oil-water mixture (the abscissa is the number of cycles, and the ordinate is the oil-water separation efficiency).

[0047] 3、 Figure 3 ​In Example 1, (a) shows the photodegradation efficiency of the multifunctional oil-water separation and purification material for four organic pollutants (MB is methylene blue, MG is malachite blue, ZH is saffron, and IN is indigo), and (b) shows the cyclic degradation efficiency of the multifunctional oil-water separation and purification material for methylene blue.

[0048] 4. Figure 4 (a) shows the strain curves of PU sponge (i.e., unmodified polyurethane sponge), PU / PDA sponge, PU / PDA / SiO2 sponge, and PU / PDA / SiO2@H-CNTs sponge at a maximum deformation of 60%. (b) shows the stress-strain curve of PU / PDA / SiO2@H-CNTs sponge after 100 adsorption cycles. Figure 4 It can be seen that compared with PU sponge, PU / PDA sponge, and PU / PDA / SiO2 sponge, the stress-strain curve of PU / PDA / SiO2@H-CNTs sponge shows a slight decrease. This is mainly because during the preparation of the superhydrophobic sponge, the sponge sample was immersed in an ethanol solution for a long time, causing the sample's skeleton to soften and thus resulting in a slight decrease in mechanical properties. Furthermore, after 100 adsorption cycles, the stress change of the PU / PDA / SiO2@H-CNTs sponge was tested using a universal testing machine. The study found that the stress of the PU / PDA / SiO2@H-CNTs sponge began to decrease after one adsorption experiment, but the stress loss gradually leveled off with the increase in the number of cycles. After 100 adsorption cycles, the stress decrease of the PU / PDA / SiO2@H-CNTs sponge was only 21.5% (…). Figure 4 Figure (b) shows that the PU / PDA / SiO2@H-CNTs sponge has outstanding mechanical stability. This excellent mechanical stability can be explained by the fact that dopamine self-polymerization and the sol-gel process enhance the interfacial strength between the sponge surface and the SiO2@H-CNTs particles, allowing the composite particles to remain stably anchored on the sponge surface after multiple cycles of use.

[0049] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for preparing a multifunctional oil-water separation and purification material with photocatalytic degradation properties, characterized in that, Includes the following steps: Step 1: The sponge is immersed in a dopamine buffer solution to carry out a self-polymerization reaction, resulting in sponge 1; Step 2: The sponge 1 is immersed in the mixture to react and obtain the sponge 2; the mixture includes a silicon source, ammonia water and carbon nanotubes; Step 3: Immerse the sponge 2 in a zinc source solution and add an alkaline solution to react, then add a silver source solution to react, to obtain the sponge 3; Step 4: After drying the sponge 3, immerse it in a hydrophobic modification solution to obtain the multifunctional oil-water separation and purification material with photocatalytic degradation performance.

2. The preparation method according to claim 1, characterized in that, Step 1 includes washing and drying the sponge before immersing it in the dopamine buffer solution; the sponge is a polyurethane sponge; the concentration of the dopamine buffer solution is 30~50g / L; the self-polymerization reaction temperature is 35~50℃, pH is 7~8, and the reaction time is 20~30min.

3. The preparation method according to claim 1, characterized in that, In step 2, the volume ratio of the silicon source, ammonia, and carbon nanotubes is 2:2:1; the mass fraction of the ammonia is 20%-50%.

4. The preparation method according to claim 1, characterized in that, In step 2, the reaction temperature is 35~50℃ and the time is 20~30min.

5. The preparation method according to claim 1, characterized in that, In step 3, the zinc source solution is a zinc nitrate solution with a concentration of 14.8~20 g / L; the alkaline solution is a sodium hydroxide solution with a concentration of 20~25 g / L; the silver source solution is a silver nitrate solution with a concentration of 25.5 g / L; and the volume ratio of the zinc source solution to the alkaline solution and the silver source solution is 3:3:

1.

6. The preparation method according to claim 1, characterized in that, In step 3, the reaction temperature of the alkaline solution is 25~40℃ and the reaction time is 2h; the reaction conditions of the silver source solution are set as follows: stirring in the dark for 2h and then irradiating under ultraviolet light for 2h.

7. The preparation method according to claim 1, characterized in that, In step 4, the hydrophobic modification solution is a perfluorooctyltriethoxysilane solution with a volume fraction of 60%~80% and the solvent is chloroform; in step 4, the impregnation temperature is 25~40℃ and the impregnation time is 20~30min.

8. A multifunctional oil-water separation and purification material with photocatalytic degradation properties prepared by the preparation method according to any one of claims 1 to 7.

9. The application of the multifunctional oil-water separation and purification material with photocatalytic degradation properties as described in claim 8 in oil-water separation.

10. The application of the multifunctional oil-water separation and purification material with photocatalytic degradation properties as described in claim 8 in the photocatalytic degradation of organic pollutants.

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