CN112316738A - Method for preparing anti-pollution forward osmosis polyamide composite membrane through post-treatment - Google Patents
Method for preparing anti-pollution forward osmosis polyamide composite membrane through post-treatment Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
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- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/56—Polyamides, e.g. polyester-amides
Abstract
A method for preparing an anti-pollution polyamide composite membrane by post-treatment relates to a method for improving the anti-pollution of the polyamide composite membrane by post-treatment modification. The invention aims to solve the problem that the prior polyamide membrane is easy to be organically polluted in the water treatment process, so that the process treatment efficiency is reduced. A method for preparing an anti-pollution polyamide composite membrane by post-treatment comprises the following steps: firstly, completing the coupling of dopamine hydrochloride, 2-bromine isobutyryl bromide and triethylamine in dimethylformamide to obtain a coupling solution; secondly, grafting an initiator on the surface of the active layer on the surface of the polyamide composite membrane; and thirdly, grafting the zwitterionic polymer to obtain the anti-pollution polyamide composite membrane. The advantages are that: the water passing performance and the salt selectivity of the composite material can be maintained while the anti-pollution performance is greatly improved. The invention is mainly used for modification treatment of the polyamide composite membrane.
Description
Technical Field
The invention relates to a method for improving the pollution resistance of a polyamide composite membrane through aftertreatment modification.
Background
With the acceleration of industrialization process, the world faces unprecedented water resource shortage problem. Therefore, how to reasonably utilize water resources and efficiently treat wastewater is an urgent task to be solved. Membrane separation plays an important role in wastewater treatment and seawater desalination as an efficient water treatment technology. Compared with the traditional water treatment process, the membrane technology has the advantages of low pollution rate, high recovery rate and the like, and has wide application prospect in the aspects of treating high-salinity and high-pollution raw material liquid such as seawater desalination, sewage and wastewater recycling and the like.
The membrane material is the core of membrane technology, and the appearance of high-performance polyamide composite Thin Films (TFC) has milestone significance for the development of the membrane technology. The polyamide composite membrane consists of a supporting layer and an active layer, wherein the active layer is a polyamide layer, but the polyamide is easy to be polluted due to the physicochemical properties of the surface of the polyamide, such as hydrophobicity, high roughness and rich carboxyl functional groups on the surface. And the membrane pollution can cause a series of defects of water yield reduction, water quality deterioration, energy consumption increase and the like, so that the anti-pollution effect of the polyamide composite membrane is improved, and the method is of great importance to the development progress of the membrane technology.
Disclosure of Invention
The invention aims to provide a method for preparing an anti-pollution forward osmosis polyamide composite membrane by post-treatment, which is characterized by comprising the following steps:
1) dissolving dopamine hydrochloride in dimethylformamide, adding 2-bromoisobutyryl bromide and triethylamine in an inert gas atmosphere, and stirring to react to obtain a coupling solution;
2) adding a trihydroxymethyl aminomethane buffer solution into the coupling solution prepared in the step 1) to obtain a mixed solution;
3) immersing an active layer on the surface of the polyamide composite membrane in the mixed solution to obtain a grafting initiator polyamide composite membrane;
4) dissolving a zwitterionic monomer in an isopropanol aqueous solution, and then adding a copper chloride catalytic complex under an inert gas atmosphere to obtain a zwitterionic monomer-containing solution
5) Immersing the grafting initiator polyamide composite membrane obtained in the step 3) into the zwitterion-containing monomer solution prepared in the step 4) in an inert gas atmosphere, adding an ascorbic acid solution, and continuing to perform polymerization reaction in the inert gas atmosphere;
6) and (3) exposing the composite membrane treated in the step 5) to the air to terminate the polymerization reaction, so as to obtain the anti-pollution polyamide composite membrane.
Further, in the step 1), the ratio of the mass (mg) of the dopamine hydrochloride to the volume (mL) of the dimethylformamide is (15-25) to 1; the ratio of the mass (mg) of dopamine hydrochloride to the volume (mL) of 2-bromoisobutyryl bromide is (3500-4000) to 13; the ratio of the mass (mg) of the dopamine hydrochloride to the volume (mL) of the triethylamine in the step one is 7500-8000: 3.
Further, in the step 2), the volume ratio of the coupling solution to the tris buffer solution is 1: 5-8.
Further, in the step 3), immersing the active layer on the surface of the polyamide composite membrane in the mixed solution, and ensuring that the supporting layer on the surface of the polyamide composite membrane is not contacted with the mixed solution, wherein the immersion time is 30-90 min, so as to obtain the grafting initiator polyamide composite membrane.
Further, in the step 4), the volume ratio of the mass (g) of the zwitterionic monomer to the volume of the isopropanol aqueous solution (mL) is (391-400) to 5000; the isopropanol aqueous solution is formed by mixing isopropanol and deionized water according to the volume ratio of the isopropanol to the deionized water of 1 (1-2);
the volume ratio of the mass (g) of the zwitterionic monomer to the volume (mL) of the copper chloride catalytic complex is (391-400): 500;
further, in the step 4), the copper chloride catalytic composite is prepared according to the following steps:
dissolving copper chloride and tripropylene glycol methyl ether acetate in an isopropanol water solution to obtain a copper chloride catalytic compound;
the mass ratio of the copper chloride to the tripropylene glycol methyl ether acetate is 1 (12-15); the ratio of the mass (g) of the copper chloride to the volume (mL) of the isopropanol aqueous solution is 1 (2000-2200); the isopropanol aqueous solution is formed by mixing isopropanol and deionized water according to the volume ratio of the isopropanol to the deionized water of 1 (1-2).
Further, the volume ratio of the mass (g) of the zwitterionic monomer in the step 4) to the ascorbic acid solution (mL) in the step 5) is (391-400): 300
Further, the zwitterionic monomer is a sulfobetaine methyl acrylate monomer or a carboxyl betaine methyl acrylate monomer.
Further, the ascorbic acid solution was prepared by the following steps: dissolving ascorbic acid in isopropanol water solution to obtain ascorbic acid solution; the volume ratio of the mass (g) of the ascorbic acid to the volume (mL) of the isopropanol aqueous solution is 1 (10-12); the isopropanol aqueous solution is formed by mixing isopropanol and deionized water according to the volume ratio of the isopropanol to the deionized water of 1 (1-2).
The mechanism of the invention is as follows: because the polyamide active layer of the polyamide composite membrane is generated by interfacial polymerization, carboxyl formed by hydrolysis reaction of unreacted acyl chloride groups is a main functional group on the surface of the polyamide composite membrane, the surface of the polyamide composite membrane is relatively hydrophobic, the roughness is high, the polyamide composite membrane is easy to be polluted in the water treatment process, and meanwhile, the carboxyl can aggravate membrane pollution through the bridging action under the condition of the existence of calcium ions.
The invention has the advantages that: the invention adopts atom transfer radical polymerization ATRP, the development is mature, the used chemical reagents are common, the selected commercial zwitterion is relatively cheap, and the ARGET-ATRP (electron transfer activated regeneration catalyst atom transfer radical polymerization) is adopted, and the invention is characterized by certain tolerance to oxygen, small amount of catalyst and convenience for large-scale industrial development in the future. Secondly, the anti-pollution polyamide composite membrane obtained by the invention can keep the water passing performance and the salt selectivity while greatly improving the anti-pollution performance. And thirdly, due to the high controllability of the ATRP, the mass transfer and anti-pollution surface performance of the membrane can be further regulated, controlled and optimized by adjusting reaction parameters such as the growth time of the polymer. Fourth, because the initiating agent is grafted on the TFC membrane by dopamine, and the dopamine can generate oxidation-crosslinking reaction under the action of dissolved oxygen to form polymeric dopamine which is strongly attached to the surface of the solid material, namely the dopamine can be attached to various different surfaces besides polyamide of the TFC membrane, so that the method is not only suitable for the TFC membrane, but also suitable for anti-pollution modification of other surfaces.
The invention belongs to a post-treatment modification method, which is mainly used for modification treatment of a polyamide composite membrane.
Drawings
FIG. 1 is a schematic flow chart of the operation of example 1;
FIG. 2 is a schematic diagram showing the attenuation of pure water flux during the contamination of the anti-contamination polyamide composite membrane and the polyamide composite membrane obtained in example 1.
Detailed Description
The present invention is further illustrated by the following examples, but it should not be construed that the scope of the above-described subject matter is limited to the following examples. Various substitutions and alterations can be made without departing from the technical idea of the invention and the scope of the invention is covered by the present invention according to the common technical knowledge and the conventional means in the field.
The first embodiment is as follows: the embodiment is a method for preparing an anti-pollution polyamide composite membrane by post-treatment, which is specifically completed by the following steps:
firstly, coupling: dissolving dopamine hydrochloride in dimethylformamide, adding 2-bromoisobutyryl bromide and triethylamine under the protection of nitrogen, and stirring to react for 2-6 h under the protection of nitrogen to obtain a coupling solution;
secondly, grafting initiator: adding a trihydroxymethyl aminomethane buffer solution into the coupling solution to obtain a mixed solution, then immersing an active layer on the surface of the polyamide composite membrane in the mixed solution, ensuring that a supporting layer on the surface of the polyamide composite membrane is not contacted with the mixed solution, and immersing for 30-90 min to obtain a grafting initiator polyamide composite membrane;
thirdly, grafting the zwitterionic polymer: dissolving a zwitterionic monomer in an isopropanol aqueous solution, then adding a copper chloride catalytic complex under the protection of nitrogen to obtain a zwitterionic monomer-containing solution, immersing a grafting initiator polyamide composite membrane in the zwitterionic monomer-containing solution under the protection of nitrogen, then adding an ascorbic acid solution under the protection of nitrogen, carrying out polymerization reaction for 2-3 h under the protection of nitrogen, then exposing the polyamide composite membrane in air to terminate the polymerization reaction, and taking out the polyamide composite membrane to obtain the anti-pollution polyamide composite membrane.
The polyamide composite membrane described in the second step of the present embodiment is a high-selectivity polyamide composite membrane, and is specifically prepared according to the method provided by the "in-situ preparation method of a high-selectivity forward osmosis polyamide composite membrane" (application number: 201410815730.7) published in china.
The main purpose of the present embodiment is to improve the anti-contamination performance of the polyamide composite membrane. The post-treatment process is adopted to modify the active layer (namely the polyamide layer) of the existing polyamide composite membrane, and the amphoteric ion polymer with high hydrophilicity is grafted on the surface of the polyamide composite membrane through a dopamine crosslinking technology and an atom transfer radical polymerization reaction, so that the hydrophilicity of the polyamide composite membrane is improved, the charge property and the roughness are reduced, the surface carboxyl concentration is reduced, and the pollution resistance of the membrane is effectively improved.
The embodiment adopts Atom Transfer Radical Polymerization (ATRP), the development is mature, the used chemical reagents are common, the selected commercial zwitterion is relatively cheap, and the ARGET-ATRP (electron transfer activated regeneration catalyst atom transfer radical polymerization) is adopted, and the ATRP is characterized by certain tolerance to oxygen, small amount of required catalyst and convenience for large-scale industrial development in the future.
The anti-pollution polyamide composite membrane obtained by the embodiment can keep the water passing performance and the salt selectivity of the anti-pollution polyamide composite membrane while greatly improving the anti-pollution performance, and in addition, due to the high controllability of the ATRP, the mass transfer and anti-pollution surface performance of the membrane can be further regulated, controlled and optimized by adjusting reaction parameters such as the growth time of the polymer.
In the embodiment, the initiator is grafted on the TFC membrane by means of dopamine, and the dopamine can generate oxidation-crosslinking reaction under the action of dissolved oxygen to form polymeric dopamine which is strongly attached to the surface of a solid material, namely the dopamine can be attached to various different surfaces besides polyamide of the TFC membrane, so that the method in the embodiment is not only suitable for the TFC membrane, but also suitable for anti-pollution modification of other surfaces.
The second embodiment is as follows: the present embodiment differs from the first embodiment in that: dissolving dopamine hydrochloride in dimethylformamide, introducing nitrogen, adding 2-bromoisobutyryl bromide and triethylamine under the protection of the nitrogen, and stirring and reacting for 2-6 hours under the protection of the nitrogen to obtain a coupling solution. The rest is the same as the first embodiment.
The third concrete implementation mode: the first or second differences from the present embodiment are as follows: the ratio of the mass of dopamine hydrochloride (mg) to the volume of dimethylformamide (mL) in step one was 800: 40. The others are the same as in the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment and one of the first to third embodiments is as follows: the ratio of the mass (mg) of dopamine hydrochloride to the volume (mL) of 2-bromoisobutyryl bromide in step one is 800: 0.26. The others are the same as the first to third embodiments.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: the ratio of the mass (mg) of dopamine hydrochloride to the volume (mL) of triethylamine in step one is 800: 0.3. The rest is the same as the first to fourth embodiments.
The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is as follows: the volume (mL) of the coupling solution and Tris buffer in step two was 40: 200. The rest is the same as the first to fifth embodiments.
The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: and adding a trihydroxymethyl aminomethane buffer solution into the coupling solution to obtain a mixed solution, then immersing an active layer on the surface of the polyamide composite membrane in the mixed solution, and ensuring that a supporting layer on the surface of the polyamide composite membrane is not contacted with the mixed solution, wherein the immersion time is 15-20 min, so as to obtain the graft initiator polyamide composite membrane. The rest is the same as the first to sixth embodiments.
The specific implementation mode is eight: the difference between this embodiment and one of the first to seventh embodiments is: and adding a trihydroxymethyl aminomethane buffer solution into the coupling solution to obtain a mixed solution, then immersing an active layer on the surface of the polyamide composite membrane in the mixed solution, and ensuring that a supporting layer on the surface of the polyamide composite membrane is not contacted with the mixed solution, wherein the immersion time is 30-60 min, so as to obtain the graft initiator polyamide composite membrane. The rest is the same as the first to seventh embodiments.
The specific implementation method nine: the difference between this embodiment and the first to eighth embodiments is: dissolving a zwitterionic monomer in an isopropanol aqueous solution, introducing nitrogen, adding a copper chloride catalytic complex under the protection of the nitrogen to obtain a zwitterionic monomer solution, immersing the graft initiator polyamide composite membrane into the zwitterionic monomer solution under the protection of the nitrogen, adding an ascorbic acid solution under the protection of the nitrogen, carrying out polymerization reaction for 1.5-2 h under the protection of the nitrogen, exposing the polyamide composite membrane to the air to terminate the polymerization reaction, and taking out the polyamide composite membrane to obtain the anti-pollution polyamide composite membrane. The others are the same as the first to eighth embodiments.
The detailed implementation mode is ten: the difference between this embodiment and one of the first to ninth embodiments is as follows: dissolving a zwitterionic monomer in an isopropanol aqueous solution, introducing nitrogen, adding a copper chloride catalytic complex under the protection of the nitrogen to obtain a zwitterionic monomer solution, immersing the grafting initiator polyamide composite membrane into the zwitterionic monomer solution under the protection of the nitrogen, adding an ascorbic acid solution under the protection of the nitrogen, carrying out polymerization reaction for 1.5h under the protection of the nitrogen, exposing the polyamide composite membrane to the air to terminate the polymerization reaction, and taking out the polyamide composite membrane to obtain the anti-pollution polyamide composite membrane. The rest is the same as the first to ninth embodiments.
The concrete implementation mode eleven: the present embodiment differs from the first to tenth embodiments in that: dissolving a zwitterionic monomer in an isopropanol aqueous solution, introducing nitrogen, adding a copper chloride catalytic complex under the protection of the nitrogen to obtain a zwitterionic monomer-containing solution, immersing the graft initiator polyamide composite membrane in the zwitterionic monomer-containing solution under the protection of the nitrogen, adding an ascorbic acid solution under the protection of the nitrogen, carrying out polymerization reaction for 2 hours under the protection of the nitrogen, exposing the polyamide composite membrane in the air to terminate the polymerization reaction, and taking out the polyamide composite membrane to obtain the anti-pollution polyamide composite membrane. The rest is the same as the first to tenth embodiments.
The specific implementation mode twelve: the present embodiment differs from the first to eleventh embodiments in that: the ratio of the mass (g) of the zwitterionic monomer described in step three to the volume of aqueous isopropanol (mL) was 15.64: 200. The rest is the same as the first to eleventh embodiments.
The specific implementation mode is thirteen: the difference between this embodiment and the first to twelfth embodiments is: the ratio of the mass (g) of the zwitterionic monomer described in step three to the volume (mL) of the copper chloride catalytic complex was 15.64: 20. The rest is the same as the first to twelfth embodiments.
The specific implementation mode is fourteen: the present embodiment differs from the first to the thirteenth embodiments in that: the ratio of the mass (g) of the zwitterionic monomer described in step three to the volume (mL) of the ascorbic acid solution was 15.64: 12. The others are the same as the first to thirteenth embodiments.
The concrete implementation mode is fifteen: the difference between this embodiment and the first to the fourteenth embodiment is: the zwitterion monomer in the third step is sulfobetaine methyl acrylate monomer/carboxyl betaine methyl acrylate monomer. The rest is the same as the first to fourteenth embodiments.
The specific implementation mode is sixteen: the difference between this embodiment and the first to the fifteenth embodiments is: the isopropanol aqueous solution in the third step is formed by mixing isopropanol and deionized water according to the volume ratio of the isopropanol to the deionized water of 1: 1. The rest is the same as the first to fifteenth embodiments.
Seventeenth embodiment: the difference between this embodiment and the first to sixteenth embodiments is: the copper chloride catalytic composite described in the third step is prepared by the following steps:
dissolving copper chloride and tripropylene glycol methyl ether acetate in an isopropanol water solution to obtain a copper chloride catalytic compound; the mass ratio of the copper chloride to the tripropylene glycol methyl ether acetate is 0.01: 0.14; the ratio of the mass (g) of the copper chloride to the volume (mL) of the aqueous isopropanol solution is 0.01: 20; the isopropanol aqueous solution is formed by mixing isopropanol and deionized water according to the volume ratio of the isopropanol to the deionized water of 1: 1.
The rest is the same as the first to sixteenth embodiments.
The specific implementation mode is eighteen: the present embodiment differs from the first to seventeenth embodiments in that: the ascorbic acid solution described in step three is prepared by the following steps: dissolving ascorbic acid in isopropanol water solution to obtain ascorbic acid solution; the ratio of the mass (g) of the ascorbic acid to the volume (mL) of the isopropanol aqueous solution is 1: 10; the isopropanol aqueous solution is formed by mixing isopropanol and deionized water according to the volume ratio of the isopropanol to the deionized water of 1: 1. The rest is the same as the first to seventeenth embodiments.
The invention is not limited to the above embodiments, and one or a combination of several embodiments may also achieve the object of the invention.
FIG. 1 is a schematic flow chart of the operation of example 1; in the first step, under the protection of nitrogen, firstly, coupling and grafting an initiator to be used in atom transfer radical polymerization reaction to dopamine; in the second step, dopamine is contacted with the surface of the polyamide composite membrane in the environment of air and buffer solution, and an initiator is grafted on the surface of the polyamide composite membrane through a polymerization reaction of polymeric dopamine formed by dopamine self-generation; in the third step, mainly relying on atom transfer radical polymerization reaction, the zwitterionic monomer grows on the polyamide composite membrane from the position of the initiator, and the grafted zwitterionic polymer modification layer can be regulated and controlled by changing the reaction time.
Carrying out organic pollution on the anti-pollution polyamide composite membrane and the polyamide composite membrane obtained in the embodiment 1, wherein the polyamide composite membrane is the polyamide composite membrane obtained in the second step; a cross-flow filtration mode is adopted, a mixture of Natural Organic Matters (NOM), sodium alginate and Bovine Serum Albumin (BSA) is used as a typical organic pollutant to pollute the membrane until 500mL of penetrating fluid is collected, flux attenuation trends of the two membranes in the organic pollution process are monitored, as shown in figure 2, figure 2 is a pure water flux attenuation schematic diagram in the pollution process of the anti-pollution polyamide composite membrane obtained in example 1 and the polyamide composite membrane, and as shown in figure 2, the water flux reduction trend of the anti-pollution polyamide composite membrane obtained through modification in example 1 is slowed down in the membrane filtration process, so that the anti-pollution performance of the membrane is greatly improved.
Claims (9)
1. A method for preparing an anti-pollution forward osmosis polyamide composite membrane through aftertreatment is characterized by comprising the following steps:
1) dissolving the dopamine hydrochloride in dimethylformamide, adding 2-bromoisobutyryl bromide and triethylamine in an inert gas atmosphere, and stirring to react to obtain a coupling solution;
2) adding a trihydroxymethyl aminomethane buffer solution into the coupling solution prepared in the step 1) to obtain a mixed solution;
3) immersing an active layer on the surface of the polyamide composite membrane in the mixed solution to obtain a grafting initiator polyamide composite membrane;
4) dissolving a zwitterionic monomer in an isopropanol aqueous solution, and then adding a copper chloride catalytic complex under an inert gas atmosphere to obtain a zwitterionic monomer-containing solution
5) Immersing the grafting initiator polyamide composite membrane obtained in the step 3) into the zwitterion-containing monomer solution prepared in the step 4) in an inert gas atmosphere, adding an ascorbic acid solution, and continuing to perform polymerization reaction in the inert gas atmosphere;
6) and (3) exposing the composite membrane treated in the step 5) to the air to terminate the polymerization reaction, so as to obtain the anti-pollution polyamide composite membrane.
2. The method for preparing the anti-pollution forward osmosis polyamide composite membrane by post-treatment according to claim 1, wherein the post-treatment comprises the following steps: in the step 1), the ratio of the mass (mg) of the dopamine hydrochloride to the volume (mL) of the dimethylformamide is (15-25) to 1.
3. The post-treatment method for preparing the anti-pollution forward osmosis polyamide composite membrane according to claim 1 or 2, wherein the post-treatment method comprises the following steps: in the step 2), the volume ratio of the coupling solution to the tris buffer solution is 1: 5-8.
4. The method for preparing the anti-pollution forward osmosis polyamide composite membrane by post-treatment according to claim 1 or 3, wherein the post-treatment comprises the following steps: and 3) immersing the active layer on the surface of the polyamide composite membrane in the mixed solution, and ensuring that the supporting layer on the surface of the polyamide composite membrane is not contacted with the mixed solution, wherein the immersion time is 30-90 min, so as to obtain the grafting initiator polyamide composite membrane.
5. The method for preparing the anti-pollution forward osmosis polyamide composite membrane by post-treatment according to claim 1 or 3, wherein the post-treatment comprises the following steps:
in the step 4), the volume ratio of the mass (g) of the zwitterionic monomer to the volume of the isopropanol aqueous solution (mL) is (391-400) to 5000;
the volume ratio of the mass (g) of the zwitterionic monomer to the volume (mL) of the copper chloride catalytic complex is (391-400): 500.
6. The method for preparing the anti-pollution forward osmosis polyamide composite membrane by post-treatment according to claim 1 or 3, wherein the post-treatment comprises the following steps: in the step 4), the copper chloride catalytic compound is prepared by the following steps:
dissolving copper chloride and tripropylene glycol methyl ether acetate in an isopropanol water solution to obtain a copper chloride catalytic compound;
the mass ratio of the copper chloride to the tripropylene glycol methyl ether acetate is 1 (12-15); the ratio of the mass (g) of the copper chloride to the volume (mL) of the isopropanol aqueous solution is 1 (2000-2200); the isopropanol aqueous solution is formed by mixing isopropanol and deionized water according to the volume ratio of the isopropanol to the deionized water of 1 (1-2).
7. The method for preparing the anti-pollution forward osmosis polyamide composite membrane by post-treatment according to claim 1 or 3, wherein the post-treatment comprises the following steps: the volume ratio of the mass (g) of the zwitterionic monomer in the step 4) to the ascorbic acid solution (mL) in the step 5) is (391-400): 300.
8. The method for preparing the anti-pollution forward osmosis polyamide composite membrane by post-treatment according to claim 1 or 3, wherein the post-treatment comprises the following steps: the zwitterionic monomer is a sulfobetaine methyl acrylate monomer or a carboxyl betaine methyl acrylate monomer.
9. The method for preparing the anti-pollution forward osmosis polyamide composite membrane by post-treatment according to claim 1 or 3, wherein the post-treatment comprises the following steps: the ascorbic acid solution was prepared as follows: dissolving ascorbic acid in isopropanol water solution to obtain ascorbic acid solution; the volume ratio of the mass (g) of the ascorbic acid to the volume (mL) of the isopropanol aqueous solution is 1 (10-12); the isopropanol aqueous solution is formed by mixing isopropanol and deionized water according to the volume ratio of the isopropanol to the deionized water of 1 (1-2).
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