An oil-water separation anti-pollution membrane and a preparation method and application thereof

Abstract

The application discloses an oil-water separation anti-pollution film and a preparation method and application thereof, and comprises the following steps: alkalization reaction is carried out by dispersing MXene powder in an alkaline solution, the obtained precipitate in the alkalization reaction is separated and collected, and the precipitate is dried and ground after being washed to neutral to prepare MNRs material; the MNRs material and silica material are dispersed in an organic solvent to uniformly mix and obtain a dispersion liquid; PVDF powder and a pore-forming agent are added into the dispersion liquid, and heating and stirring are conducted to obtain a casting solution, and defoaming, film scraping and film slicing are conducted to obtain a film piece; the film piece is placed in water to separate into a film, and residual organic solvent is removed by immersion, so that the oil-water separation anti-pollution film is obtained. The application aims at the problems that a polymer film is blocked and has poor durability in actual application of membrane separation technology, and provides a preparation method of the oil-water separation anti-pollution film. The prepared film has good oil filtration effect and good recycling performance, and has economic practicability.

Description

Technical Field

[0001] This invention belongs to the field of membrane separation technology, specifically relating to an oil-water separation antifouling membrane, its preparation method, and its application. Background Technology

[0002] The discharge of oily wastewater and frequent accidental oil spills have caused severe pollution, disruption of ecological balance, and enormous economic losses. Oceans and land are polluted by crude oil spills. These incidents seriously threaten biodiversity, pose high risks to public health, and create a huge demand for oil-water separation technologies.

[0003] In recent decades, membrane separation technology has been widely used in the treatment of oily wastewater due to its advantages such as low energy consumption, high efficiency, and simple operation. Membrane separation technology removes pollutants of a certain particle size from water through specially designed porous materials.

[0004] Currently, superhydrophilic / underwater superoleophobic film materials can effectively separate emulsified oily wastewater while maintaining good self-cleaning properties, making them a research hotspot in the field of oily wastewater purification.

[0005] However, current separation materials encounter two common problems in practical applications: membrane fouling and low flux, especially for applications involving surfactant-containing emulsions and high-viscosity crude oil / water mixtures. Summary of the Invention

[0006] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0007] In view of the problems existing in the above and / or prior art, the present invention is proposed.

[0008] Therefore, the purpose of this invention is to overcome the shortcomings of the prior art and provide a method for preparing an oil-water separation antifouling membrane.

[0009] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for preparing an oil-water separation antifouling membrane, comprising,

[0010] MXene powder was dispersed in an alkaline solution for alkalization reaction. The precipitate obtained from the alkalization reaction was separated and collected, washed with water until neutral, and then dried and ground to obtain MNRs material.

[0011] MNRs material and silica material are dispersed in an organic solvent and mixed evenly to obtain a dispersion.

[0012] PVDF powder and pore-forming agent are added to the dispersion, heated and stirred to obtain a casting solution, degassed, scraped, and a film is obtained;

[0013] The membrane is separated into a film by placing it in water and then soaking it to remove residual organic solvents, thus obtaining an oil-water separation antifouling membrane.

[0014] In a preferred embodiment of the preparation method described in this invention, the alkaline solution is either a sodium hydroxide solution or a potassium hydroxide solution, and its concentration is 2-4 mol / L.

[0015] In a preferred embodiment of the preparation method described in this invention, the alkalization reaction time is 48–72 h.

[0016] In a preferred embodiment of the preparation method described in this invention, the grinding process yields MNRs material, wherein the particle size of the MNRs material is 1 nm~ .

[0017] In a preferred embodiment of the preparation method described in this invention, the MNRs material and the silica material are dispersed in an organic solvent, wherein the organic solvent includes a DMF solution.

[0018] In a preferred embodiment of the preparation method described in this invention, the dispersion contains a ratio of MNRs material to silica material of 2–8 mg: 5–15 mg, and an organic solvent to MNRs material ratio of 40–80 mL: 2–8 mg.

[0019] In a preferred embodiment of the preparation method described in this invention, the pore-forming agent comprises polyethylene glycol and polyvinylpyrrolidone.

[0020] In a preferred embodiment of the preparation method described in this invention, the PVDF powder and pore-forming agent are added to the dispersion, wherein the ratio of PVDF powder to pore-forming agent is 3-5g:0.1-0.3g, and the ratio of PVDF powder to pore-forming agent is 3-5g:0.1-0.3g; the casting solution is obtained by heating and stirring, wherein the heating and stirring temperature is 50-70℃, and the stirring time is 6-8h.

[0021] As a preferred embodiment of the preparation method described in this invention, the film-scraping conditions are as follows: the degassed casting solution is scraped onto a glass plate at a uniform speed using a 150μm doctor blade.

[0022] Another object of the present invention is to overcome the shortcomings of the prior art and provide an application of an oil-water separation antifouling membrane in the separation of surfactant-containing emulsions and high-viscosity crude oil or water mixtures.

[0023] Beneficial effects of this invention:

[0024] (1) In view of the problem that polymer membranes are subject to fouling and have poor durability in the practical application of membrane separation technology, this invention proposes a method for preparing an anti-fouling membrane for oil-water separation. The membrane prepared has good oil filtration effect, good recycling performance, and is economical and practical.

[0025] (2) This invention proposes a method for preparing an oil-water separation antifouling membrane, which prepares MNRs material and disperses it with silica material in an organic solvent. The two work synergistically to improve the filtration performance of the membrane. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0027] Figure 1 This is a flowchart illustrating the preparation process of the composite membrane of the present invention.

[0028] Figure 2 The images show a comparison of composite membrane filtration experiments, where a. is the vacuum filtration device; b. is the original edible oil emulsion; and c. is the solution after filtration using the composite membrane.

[0029] Figure 3 This is an optical microscope image of water samples before and after filtration using the composite membrane in Example 2. Detailed Implementation

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the examples in the specification.

[0031] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0033] In this invention, MXene powder (multilayer Ti3C2T) xAccordion-shaped), purchased from Hesimo New Materials;

[0034] Silica (20 nm type, hydrophilic and oleophobic), purchased from Beasley New Materials Co., Ltd.

[0035] PVDF (FR90 type) powder, CAS number: 24937-79-9, purchased from Shanghai Sanaifu New Material Technology Co., Ltd.;

[0036] PEG6000, purchased from Aladdin;

[0037] All other raw materials are ordinary commercially available products.

[0038] Performance testing of composite separation membranes for oil-water mixture separation:

[0039] (1) The water flux test method is to determine the water flux of the membrane by using a vacuum filtration device to pass 100ml of pure water through the composite membrane. The specific formula is as follows:

[0040] In the formula, V(L), A(m2), and Δt(h) represent the filtrate volume, effective membrane permeation area, and filtration time, respectively.

[0041] (2) The oil flux test method is to measure the water flux of the membrane by passing 100 ml of an oil-in-water emulsion (edible oil emulsion: 990 mL of deionized water is added to the container, 30 mg of SDS is used as an emulsifier; then, 10 mL of edible oil is added to the above solution, ultrasonically stirred for 30 min, and then vigorously stirred for 6 h to obtain a surfactant-stabilized emulsion) through the composite membrane using a vacuum filtration device. The specific formula is as follows:

[0042] In the formula, V(L), A(m2), Δt(h), and ΔP(bar) represent the filtrate volume, effective membrane permeation area, filtration time, and transmembrane pressure, respectively.

[0043] (3) The retention rate test method is as follows: 100 ml of oil-in-water emulsion (edible oil emulsion: 990 mL of deionized water is added to the container, 30 mg SDS is used as the emulsifier; then, 10 mL of edible oil is added to the above solution, ultrasonically stirred for 30 min, and then vigorously stirred for 6 h to obtain a surfactant-stabilized emulsion) is filtered through a composite membrane using a vacuum filtration device. The concentration of the solutions before and after filtration is then measured using an infrared oil analyzer. The specific formula is as follows:

[0044] Where C i CO (mg / L) and CO (mg / L) represent the oil content in the filtered and raw feed emulsions, respectively.

[0045] (4) The test method for flux recovery rate is to perform a simple cleaning of the membrane after oil filtration and then measure the water flux again. The formula is as follows:

[0046] JW1 and JW2 are the pure water flux before and after filtering the emulsion, respectively.

[0047] Example 1

[0048] (1) Take a clean beaker, add 100ml of deionized water, weigh 20g of KOH solid and dissolve it in it to prepare a KOH solution with a concentration of 4mol / L, and let it stand.

[0049] (2) Weigh 0.1g of MXene powder and add it to the KOH solution prepared in step (1). Then place it on a magnetic stirrer and stir for 72h at a speed of 1000rpm and a temperature of room temperature to allow MXene to undergo a full alkalization reaction.

[0050] (3) After the reaction reaches 72h, the solution after the reaction is transferred to a centrifuge tube, centrifuged at 3000rpm for 10 minutes, then the supernatant is poured out, the remaining solid is rinsed with deionized water, and then centrifuged again.

[0051] Repeat the operation three times until the supernatant is neutral. Dry the neutralized material in an oven at 65°C, then grind it to 1500 mesh in a mortar to reduce agglomeration, and finally collect the MNRs material.

[0052] (4) Take a clean beaker, fill it with 40 ml of DMF solution, add 5 mg of the MNRs material prepared in step (3) and 10 mg of silicon dioxide, and then place it in an ultrasonic device with a power of 240 W and a temperature of 34 °C. After 30 min of ultrasonication, the material is evenly dispersed in the organic solvent to obtain MNRs-SiO2 dispersion.

[0053] (5) Weigh 3g of PVDF powder and 0.1g of PEG6000 and add them to the dispersion, where the volume of the dispersion is 40ml. Heat and stir for 6h, then cool and let stand for 12h to degas and form a casting solution.

[0054] (6) After the casting solution is scraped with a scraper, the resulting membrane is immediately placed in deionized water for phase inversion. The membrane needs to be soaked in deionized water for more than 24 hours, and the water is changed every 2 hours to allow the solvent and non-solvent to be fully exchanged, and finally a composite separation membrane is obtained.

[0055] Example 2

[0056] (1) Take a clean beaker, add 100ml of deionized water, weigh 15g of KOH solid and dissolve it in it to prepare a KOH solution with a concentration of 4mol / L, and let it stand.

[0057] (2) Weigh 0.1g of MXene powder and add it to the KOH solution prepared in step (1), and then place it on a magnetic stirrer and stir for 74h to allow MXene to undergo a full alkalization reaction.

[0058] (3) After the reaction reaches 74h, the solution after the reaction is transferred to a centrifuge tube, centrifuged at 3000rpm for 10 minutes, then the supernatant is poured out, the remaining solid is rinsed with deionized water, and then centrifuged again.

[0059] Repeat the process three times until the supernatant is neutral. Dry the neutralized material in an oven at low temperature, then grind it in a mortar to reduce agglomeration, and finally collect the MNRs material.

[0060] (4) Take a clean beaker, fill it with 40 ml of DMF solution, add 4 mg of the MNRs material prepared in step (3) and 10 mg of silicon dioxide, and then place it in an ultrasonic device and sonicate it for 30 min to make the material uniformly dispersed in the organic solvent to obtain MNRs-SiO2 dispersion.

[0061] (5) Weigh 3g of PVDF powder and 0.1g of PEG6000 and add them to the dispersion. Heat and stir for 6 hours, then cool and let stand for 12 hours to degas and form a casting solution.

[0062] (6) After the casting solution is scraped with a scraper, the resulting membrane is immediately placed in deionized water for phase inversion. The membrane needs to be soaked in deionized water for more than 24 hours, and the water is changed every 2 hours to allow the solvent and non-solvent to be fully exchanged, and finally a composite separation membrane is obtained.

[0063] See optical microscopy results of water samples before and after composite membrane filtration. Figure 3 (a is before filtration, b is before filtration), where the water sample before composite membrane filtration is a prepared oil-in-water emulsion of edible oil (990 mL of deionized water is added to the container, and 30 mg of SDS is used as an emulsifier; then, 10 mL of edible oil is added to the above solution, ultrasonically stirred for 30 min, and then vigorously stirred for 6 h to obtain a surfactant-stabilized emulsion). Figure 3 It can be seen that the solution was very turbid before filtration, but became clear after being filtered through the composite membrane.

[0064] Example 3

[0065] (1) Take a clean beaker, add 100ml of deionized water, weigh 30g of KOH solid and dissolve it in it to prepare a KOH solution with a concentration of 5mol / L, and let it stand.

[0066] (2) Weigh 0.1g of MXene powder and add it to the KOH solution prepared in step (1), and then place it on a magnetic stirrer and stir for 80h to allow MXene to undergo a full alkalization reaction.

[0067] (3) After the reaction reaches 80h, the solution after the reaction is transferred to a centrifuge tube, centrifuged at 3000rpm for 10 minutes, then the supernatant is poured out, the remaining solid is rinsed with deionized water, and then centrifuged again.

[0068] Repeat the process three times until the supernatant is neutral. Dry the neutralized material in an oven at low temperature, then grind it in a mortar to reduce agglomeration, and finally collect the MNRs material.

[0069] (4) Take a clean beaker, fill it with 40 ml of DMF solution, add 10 mg of the MNRs material prepared in step (3) and 10 mg of silicon dioxide, and then place it in an ultrasonic device and sonicate it for 30 min to make the material uniformly dispersed in the organic solvent to obtain MNRs-SiO2 dispersion.

[0070] (5) Weigh 3g of PVDF powder and 0.1g of PEG6000 and add them to the dispersion. Heat and stir for 6 hours, then cool and let stand for 12 hours to degas and form a casting solution.

[0071] (6) After the casting solution is scraped with a scraper, the resulting membrane is immediately placed in deionized water for phase inversion. The membrane needs to be soaked in deionized water for more than 24 hours, and the water is changed every 2 hours to allow the solvent and non-solvent to be fully exchanged, and finally a composite separation membrane is obtained.

[0072] The PVDF-MNRS-SiO2 composite separation membrane prepared in Example 1 was used to test the separation performance of an oil-water mixture (990 mL of deionized water was added to the container, 30 mg of SDS was used as an emulsifier; then, 10 mL of edible oil was added to the above solution, ultrasonically stirred for 30 min, and then vigorously stirred for 6 h to obtain a surfactant-stabilized emulsion). Its filtration effect was as follows: Figure 2 As shown in the figure, the state of the oil-water mixture before filtration is illustrated. Optical microscope images before and after filtration are compared. Before filtration, the mixture was filled with oil droplets and bubbles. After filtration, the bubbles disappeared, indicating that the oil contaminants were successfully intercepted.

[0073] The PVDF-MNRS-SiO2 composite separation membrane prepared in Example 1 was used to test its water flux, oil filtration effect and flux recovery rate as shown in Table 1 below.

[0074] Table 1

[0075]

[0076] Comparative Example 1

[0077] Based on Example 1, a comparison was made by directly adding MXene powder to prepare a film without preparing MNRs materials, with all other conditions the same as in Example 1.

[0078] Comparative Example 2

[0079] Based on Example 1, a comparison without the addition of MNRs materials is provided, under the following conditions:

[0080] (1) Take a clean beaker, fill it with 40 ml of DMF solution, add 15 mg of silicon dioxide, and then place it in an ultrasonic device for 30 min of ultrasonication to make the material uniformly dispersed in the organic solvent to obtain SiO2 dispersion.

[0081] (2) Weigh 3g of PVDF powder and 0.1g of PEG6000 and add them to the dispersion and heat and stir for 6h. Then cool and let stand for 12h to degas and form a casting solution.

[0082] (3) After the casting solution is scraped with a scraper, the resulting membrane is immediately placed in deionized water for phase inversion. The membrane needs to be soaked in deionized water for more than 24 hours, and the water is changed every 2 hours to allow the solvent and non-solvent to be fully exchanged, and finally a composite separation membrane is obtained.

[0083] Comparative Example 3

[0084] Based on Example 1, a comparison without the addition of silica is provided, under the following conditions:

[0085] (1) Take a clean beaker, add 100ml of deionized water, weigh 20g of KOH solid and dissolve it in it to prepare a KOH solution with a concentration of 4mol / L, and let it stand.

[0086] (2) Weigh 0.1g of MXene powder and add it to the KOH solution prepared in step (1), and then place it on a magnetic stirrer and stir for 72h to allow MXene to undergo a full alkalization reaction.

[0087] (3) After the reaction reaches 72h, the solution after the reaction is transferred to a centrifuge tube, centrifuged at 3000rpm for 10 minutes, then the supernatant is poured out, the remaining solid is rinsed with deionized water, and then centrifuged again.

[0088] Repeat the process three times until the supernatant is neutral. Dry the neutralized material in an oven at low temperature, then grind it in a mortar to reduce agglomeration, and finally collect the MNRs material.

[0089] (4) Take a clean beaker, fill it with 40 ml of DMF solution, add 15 mg of the MNRs prepared in step (3), and then place it in an ultrasonic device and sonicate it for 30 min to disperse the material evenly in the organic solvent to obtain the MNRs dispersion.

[0090] (5) Weigh 3g of PVDF powder and 0.1g of PEG6000 and add them to the dispersion. Heat and stir for 6 hours, then cool and let stand for 12 hours to degas and form a casting solution.

[0091] (6) After the casting solution is scraped with a scraper, the resulting membrane is immediately placed in deionized water for phase inversion. The membrane needs to be soaked in deionized water for more than 24 hours, and the water is changed every 2 hours to allow the solvent and non-solvent to be fully exchanged, and finally a composite separation membrane is obtained.

[0092] Comparative Example 4

[0093] (1) Take a clean beaker, add 100ml of deionized water, weigh 20g of KOH solid and dissolve it in it to prepare a KOH solution with a concentration of 4mol / L, and let it stand.

[0094] (2) Weigh 0.1g of MXene powder and add it to the KOH solution prepared in step (1). Then place it on a magnetic stirrer and stir for 72h at a speed of 1000rpm and a temperature of room temperature to allow MXene to undergo a full alkalization reaction.

[0095] (3) After the reaction reaches 72h, the solution after the reaction is transferred to a centrifuge tube, centrifuged at 3000rpm for 10 minutes, then the supernatant is poured out, the remaining solid is rinsed with deionized water, and then centrifuged again.

[0096] Repeat the operation three times until the supernatant is neutral. Dry the neutralized material in an oven at 65°C, then grind it to 1500 mesh in a mortar to reduce agglomeration, and finally collect the MNRs material.

[0097] (4) Take a clean beaker, fill it with 50 ml of DMF solution, add 10 mg of the MNRs material prepared in step (3) and 15 mg of silicon dioxide, and then place it in an ultrasonic device with a power of 240 W and a temperature of 34 °C. After 30 min of ultrasonication, the material is evenly dispersed in the organic solvent to obtain MNRs-SiO2 dispersion.

[0098] (5) Weigh 4g of PVDF powder and 0.2g of PEG6000 and add them to the dispersion, where the dispersion volume is 40ml. Heat and stir for 6h, then cool and let stand to degas for 12h to form a casting solution.

[0099] (6) After the casting solution is scraped with a scraper, the resulting membrane is immediately placed in deionized water for phase inversion. The membrane needs to be soaked in deionized water for more than 24 hours, and the water is changed every 2 hours to allow the solvent and non-solvent to be fully exchanged, and finally a composite separation membrane is obtained.

[0100] Comparative Example 5

[0101] Based on Example 1, a PVDF membrane purchased from Longjin Membrane Technology Co., Ltd. was provided for comparison.

[0102] The water flux, oil filtration effect, and flux recovery rate were tested as shown in Table 2 below.

[0103] Table 2

[0104]

[0105] Comparative Example 6

[0106] Under the conditions of Example 1, a comparison of the ratio of MNRs material and silicon dioxide is provided. Other conditions are the same as in Example 1, except for step (4):

[0107] Experiment 1: Take a clean beaker, fill it with 40 ml of DMF solution, add 10 mg of the MNRs material prepared in step (3) and 5 mg of silicon dioxide, and then place it in an ultrasonic device with a power of 240 W and a temperature of 34 °C. After 30 min of ultrasonication, the material is evenly dispersed in the organic solvent to obtain MNRs-SiO2 dispersion.

[0108] Experiment 2: Take a clean beaker, fill it with 40 ml of DMF solution, add 8 mg of MNRs material prepared in step (3) and 7 mg of silicon dioxide, and then place it in an ultrasonic device with a power of 240 W and a temperature of 34 °C. After 30 min of ultrasonication, the material is uniformly dispersed in the organic solvent to obtain MNRs-SiO2 dispersion.

[0109] Experiment 3: Take a clean beaker, fill it with 40 ml of DMF solution, add 2 mg of the MNRs material prepared in step (3) and 13 mg of silicon dioxide, and then place it in an ultrasonic device with a power of 240 W and a temperature of 34 °C. After 30 min of ultrasonication, the material is uniformly dispersed in the organic solvent to obtain MNRs-SiO2 dispersion.

[0110] The water flux, oil filtration effect, and flux recovery rate were tested as shown in Table 3 below.

[0111] Table 3

[0112] <![CDATA[Water flux (L / m 2 ·h)]]> <![CDATA[Oil flux (L / m 2 ·h)]]> Retention rate (%) Flux recovery rate (%) Experiment 1 2670 943.2 93.2 97 Experiment 2 2950.3 1004.6 96.3 98 Experiment 3 2253 832.3 87 92

[0113] As can be seen from Table 3, the best effect of water-in-oil emulsion treatment is achieved when the ratio of MNRs to SiO2 is close to 1:1. When the ratio of MNRs is too small, the fibrous structure on the membrane is not embedded enough, which reduces the oil barrier effect.

[0114] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the present invention.

Claims

1. A method for preparing an oil-water separation antifouling membrane, characterized in that: include, MXene powder was dispersed in an alkaline solution for alkalization reaction. The precipitate obtained from the alkalization reaction was separated and collected, washed with water until neutral, and then dried and ground to prepare MNRs material. MNRs and silica are dispersed in an organic solvent and mixed evenly to obtain a dispersion. The ratio of MNRs to silica is 2-8 mg: 5-15 mg, and the ratio of organic solvent to MNRs is 40-80 mL: 2-8 mg. The organic solvent is a DMF solution. PVDF powder and pore-forming agent are added to the dispersion, heated and stirred to obtain a casting solution, degassed, scraped, and a film is obtained; The membrane is separated into a film by placing it in water and then soaking it to remove residual organic solvents, thus obtaining an oil-water separation antifouling membrane.

2. The preparation method according to claim 1, characterized in that: The alkaline solution is either a sodium hydroxide solution or a potassium hydroxide solution, with a concentration of 2-4 mol / L.

3. The preparation method according to claim 1 or 2, characterized in that: The alkalization reaction time is 48~72h.

4. The preparation method according to claim 3, characterized in that: The grinding process yields MNRs materials, wherein the particle size of the MNRs materials is 1 nm to 5 μm.

5. The preparation method according to claim 1, characterized in that: The pore-forming agent includes polyethylene glycol and polyvinylpyrrolidone.

6. The preparation method according to claim 1, characterized in that: The PVDF powder and pore-forming agent are added to the dispersion, wherein the ratio of PVDF powder to pore-forming agent is 3~5g:0.1~0.3g, and the ratio of PVDF powder to pore-forming agent is 3~5g:0.1~0.3g; the casting liquid is obtained by heating and stirring, wherein the heating and stirring temperature is 50~70℃, and the stirring time is 6~8h.

7. The preparation method according to claim 6, characterized in that: The film-scraping conditions are as follows: the degassed casting solution is scraped onto a glass plate at a uniform speed using a 150μm doctor blade.

8. The application of the oil-water separation antifouling membrane prepared by any of the preparation methods described in claims 1 to 7 in the separation of oil-in-water emulsions containing surfactants.

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