CN102423646B - Nano-filtration membrane for separating organic compounds and salts, and preparation method thereof - Google Patents
Nano-filtration membrane for separating organic compounds and salts, and preparation method thereof Download PDFInfo
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- CN102423646B CN102423646B CN 201110235657 CN201110235657A CN102423646B CN 102423646 B CN102423646 B CN 102423646B CN 201110235657 CN201110235657 CN 201110235657 CN 201110235657 A CN201110235657 A CN 201110235657A CN 102423646 B CN102423646 B CN 102423646B
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Abstract
The present invention discloses a nano-filtration membrane for separating organic compounds and salts, and a preparation method thereof. The nano-filtration membrane of the present invention comprises a porous polysulfone support layer and an amphion-containing copolymer adopted a functional layer. The preparation process comprises: carrying out a solution polymerization reaction to obtain the amphion-containing copolymer; preparing the amphion-containing copolymer and a cross-linking agent into an aqueous dispersion with a certain concentration; carrying out impregnating for the surface of the porous polysulfone support membrane by the aqueous dispersion; carrying out curing cross-linking to obtain the composite membrane. According to the present invention, the composite nano-filtration membrane has water flux of 20-30 L.m<-2>.h<-1> under operation pressure of 0.6 MPa; the nano-filtration membrane provides the retention rate more than 90% for the organic compound molecules with the molecular weight more than 800, and provides the retention rate less than 20% for the inorganic salt molecules; the preparation method of the present invention is simple, the reaction conditions are mild, and the production cost is low; with the nano-filtration membrane, the good separation performance is provided for the organic compounds and the inorganic salts, and the good industrial application prospect is provided.
Description
Technical field
The invention belongs to the NF membrane separation field, relate in particular to a kind of NF membrane for separating of organic matter and salt and preparation method thereof.
Background technology
Nanofiltration is a kind of novel pressure-actuated film separation process that grows up phase late 1980s.The pore diameter range of NF membrane about about 1～5nm, is a kind of diffusion barrier between reverse osmosis membrane and milipore filter greatly.NF membrane generally is charged membrane, and it is by aperture screening and the realization of Coulomb repulsion double action inorganic salts and various organic separation to different valence state.The nanofiltration separation technology has been widely used in the Separation ﹠ Purification of material in water softening, wastewater treatment, bio-pharmaceuticals, the field of petrochemical industry in recent years because its separation process does not have phase transformation, need not heating, do not damage advantages such as material self-characteristic, operating pressure are lower.
The compound diffusion barrier that NF membrane generally is made up of the porous support layer of the cortex that plays centrifugation and a humidification.Wherein, the cortex of NF membrane is loose than the cortex of reverse osmosis membrane, but finer and close than the cortex of milipore filter, therefore regulates the compactness extent of its cortex to reach the key that separation requirement is the NF membrane preparation.At present, the preparation method of NF membrane mainly contains phase inversion, interfacial polymerization, surface-coated method and chemic modified method etc.The commercialization NF membrane mainly contains the film of cellulose acetate class (as Eastman Kodak E394-60(bear)), the UTC-20HF(bear of polyamide-based (as the NF-40(bear of Film Tec company) and toray company) sulfonated polyether sulfone class (as the NFR-7400(bear of Japan eastern electrician company exploitation) series film)) etc.These films are generally 20～50% to the rejection of monovalence inorganic salts, to the rejection of divalence and above valence state inorganic salts thereof greater than 90%.Yet some practical application systems require film low to the rejection of inorganic salts, to organic rejection height, to realize the separating effect of organic matter desalination.
Now have report, NF membrane is applied to the separation purification (membrane science and technology 29 (2009) 79-89) of compound sugar, amino acid whose separation and purification (Biochemical Engineering Journal 19 (2004) 165 – 170), the recovery of dyestuff (Desalination 130 (2000) 177-183) etc., with the organic matter in the realization system and salt, and separating between organic matter and organic matter.But when existing NF membrane is applied to above-mentioned separation system, still exist separative efficiency lower, problem such as stain resistance is relatively poor.Therefore, be badly in need of developing a kind of above-mentioned separation system that is fit to, separative efficiency height, the NF membrane that stain resistance is good.Discover recently, contain zwitterionic macromolecular material and have good stain resistance, and and inorganic ion between have static combination (Langmuir 23 (2007) 7818-7830).Therefore, will contain zwitterionic electroneutral macromolecular material and be prepared into NF membrane, be applied to organic matter desalination aspect, the separating property that is expected to obtain and anti-fouling performance.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of NF membrane for separating of organic matter and salt and preparation method thereof is provided.
NF membrane for separating of organic matter and salt is by the porous polysulfone supporting layer and contains the compound NF membrane that zwitterionic bipolymer is functional layer.
Step for separating of the preparation method of the NF membrane of organic matter and salt is as follows:
1) monomer that contains the amphion group of 3～6 mass parts and the hydroxyalkyl acrylate monomer of 1 mass parts are added to the water, be made into the aqueous solution that mass percent concentration is 10～30wt%, feed nitrogen, adding mass percent concentration is water soluble oxidized-reduction initator of 1～3wt%, 30～45
oCarry out polymerisation in solution under the C, polymerization time is 1～5 hour, through repeatedly centrifugal, the washing after, obtain containing zwitterionic bipolymer, standby after the vacuum drying;
2) 1～2.5 mass parts above-mentioned contained zwitterionic bipolymer, the polyaldehyde of 0.1～0.45 mass parts is added to the water dispersion, and adding inorganic acid regulator solution pH value again is 1.8～3.8,20～30
oStirred under the temperature of C 20～40 minutes, and obtained milky dispersion liquid;
3) 20～30
oUnder the temperature of C and 50～60% the relative air humidity condition, polysulphone super-filter membrane was flooded in above-mentioned dispersion liquid 2～5 minutes, take out and get rid of surperficial excess solution, again it is positioned over 40～60
oIn the baking oven of C temperature 2～4 hours, obtain containing zwitterionic composite nanometer filtering film.
The monomer that contains the amphion group described in the step 1) is 3-[N, N-dimethyl-[2-(2-methyl-prop-2-alkene acyloxy) ethyl] ammonium] propane-1-acid inner salt, 2-[N, N-dimethyl-[2-(2-methyl-prop-2-alkene acyloxy) ethyl] ammonium] ethane-1-carboxylic acid inner salt or 3-(4-vinylpridine) propane-1-carboxylic acid inner salt.Hydroxyalkyl acrylate monomer described in the step 1) is hydroxy-ethyl acrylate, hydroxyethyl methacrylate or hydroxy propyl methacrylate.Oxidant in the oxidation-reduction initiator described in the step 1) is ammonium persulfate or potassium peroxydisulfate, and the reducing agent in the described oxidation-reduction initiator is sodium hydrogensulfite, and the mass ratio of Oxidizing and Reducing Agents is 1:1.Step 2) described in polyaldehyde be MDA, glutaraldehyde, butanedial or hexandial.Step 2) inorganic acid described in is sulfuric acid or hydrochloric acid.
The present invention is by adjusting the content of amphion group in the bipolymer, obtain the NF membrane different with the inorganic salts rejection to organic molecule, be that the rejection of 800 organic molecule is greater than 90% to molecular weight, and it is very low to the rejection of inorganic salts, generally be lower than 20%, water flux is 20～30 L.m
-2.h
-1This kind composite nanometer filtering film shows good separating property to organic matter and inorganic salts, has broad application prospects.
The present invention is to contain zwitterionic bipolymer as the material of film surface isolation layer, copolymer is to be prepared by the monomer that contains the amphion group and the hydroxyalkyl acrylate monomer method by polymerisation in solution, and the composition of polymer and hydrophilic and hydrophobic thereof can be realized by kind and the proportioning thereof of adjusting comonomer; Simultaneously, used monomer conveniently is easy to get, and is cheap; The polymerization solvent for use is water, clean environment firendly, and preparation process is simple and safe.The preparation of composite membrane adopts simple dip-coating, the crosslinked processing of heat cure to get final product, and filming technology is simple, cost is low, has the favorable industrial practicality.
The specific embodiment
NF membrane for separating of organic matter and salt is by the porous polysulfone supporting layer and contains the compound NF membrane that zwitterionic bipolymer is functional layer.
Step for separating of the preparation method of the NF membrane of organic matter and salt is as follows:
1) monomer that contains the amphion group of 3～6 mass parts and the hydroxyalkyl acrylate monomer of 1 mass parts are added to the water, be made into the aqueous solution that mass percent concentration is 10～30wt%, feed nitrogen, adding mass percent concentration is water soluble oxidized-reduction initator of 1～3wt%, 30～45
oCarry out polymerisation in solution under the C, polymerization time is 1～5 hour, through repeatedly centrifugal, the washing after, obtain containing zwitterionic bipolymer, standby after the vacuum drying;
2) 1～2.5 mass parts above-mentioned contained zwitterionic bipolymer, the polyaldehyde of 0.1～0.45 mass parts is added to the water dispersion, and adding inorganic acid regulator solution pH value again is 1.8～3.8,20～30
oStirred under the temperature of C 20～40 minutes, and obtained milky dispersion liquid;
3) 20～30
oUnder the temperature of C and 50～60% the relative air humidity condition, polysulphone super-filter membrane was flooded in above-mentioned dispersion liquid 2～5 minutes, take out and get rid of surperficial excess solution, again it is positioned over 40～60
oIn the baking oven of C temperature 2～4 hours, obtain containing zwitterionic composite nanometer filtering film.
The monomer that contains the amphion group described in the step 1) is 3-[N, N-dimethyl-[2-(2-methyl-prop-2-alkene acyloxy) ethyl] ammonium] propane-1-acid inner salt, 2-[N, N-dimethyl-[2-(2-methyl-prop-2-alkene acyloxy) ethyl] ammonium] ethane-1-carboxylic acid inner salt or 3-(4-vinylpridine) propane-1-carboxylic acid inner salt.Hydroxyalkyl acrylate monomer described in the step 1) is hydroxy-ethyl acrylate, hydroxyethyl methacrylate or hydroxy propyl methacrylate.Oxidant in the oxidation-reduction initiator described in the step 1) is ammonium persulfate or potassium peroxydisulfate, and the reducing agent in the described oxidation-reduction initiator is sodium hydrogensulfite, and the mass ratio of Oxidizing and Reducing Agents is 1:1.Step 2) described in polyaldehyde be MDA, glutaraldehyde, butanedial or hexandial.Step 2) inorganic acid described in is sulfuric acid or hydrochloric acid.
Provide embodiments of the invention below, but the present invention is not subjected to the restriction of embodiment:
Embodiment 1:
3-[N with 6 mass parts, N-dimethyl-[2-(2-methyl-prop-2-alkene acyloxy) ethyl] ammonium] the hydroxy-ethyl acrylate monomer of propane-1-acid inner salt and 1 mass parts is added to the water, be made into the aqueous solution that mass percent concentration is 10wt%, feed nitrogen, the adding mass percent concentration is 1% oxidation-reduction initiator K
2S
2O
8And NaHSO
3(1:1), 45
oCarry out polymerisation in solution under the C, polymerization time is 1 hour, through repeatedly centrifugal, the washing after, obtain containing zwitterionic bipolymer, standby after the vacuum drying; The glutaraldehyde of zwitterionic bipolymer and 0.1 mass parts is added to the water dispersion with containing of 1 mass parts, and adding sulfuric acid regulation solution pH value again is 1.8,20
oStirred 20 minutes under the temperature of C, obtain milky dispersion liquid; 20
oUnder the temperature of C and 50% the relative air humidity condition, polysulphone super-filter membrane was flooded 5 minutes in above-mentioned dispersion liquid, take out and get rid of surperficial excess solution, be placed on again in the baking oven, 40
oCrosslinking curing is 4 hours under the C, obtains composite nanometer filtering film.This composite nanometer filtering film is at 25 ℃, under the 0.6MPa pressure, for 1g.L
-1NaCl, K
2SO
4, PEG600 and PEG800 solution separating resulting be: the rejection to NaCl is 10.8%, to K
2SO
4Rejection be 15.7%; Rejection to PEG600 is 88.5%; Rejection to PEG800 is 92.3%, and water flux is 24.8L.m
-2.h
-1
Embodiment 2:
3-[N with 3 mass parts, N-dimethyl-[2-(2-methyl-prop-2-alkene acyloxy) ethyl] ammonium] the hydroxy-ethyl acrylate monomer of propane-1-acid inner salt and 1 mass parts is added to the water, be made into the aqueous solution that mass percent concentration is 30wt%, feed nitrogen, the adding mass percent concentration is 3% oxidation-reduction initiator K
2S
2O
8And NaHSO
3(1:1), 30
oCarry out polymerisation in solution under the C, polymerization time is 5 hours, through repeatedly centrifugal, the washing after, obtain containing zwitterionic bipolymer, standby after the vacuum drying; The glutaraldehyde of zwitterionic bipolymer and 0.45 mass parts is added to the water dispersion with containing of 2.5 mass parts, and adding sulfuric acid regulation solution pH value again is 3.8,30
oStirred 40 minutes under the temperature of C, obtain milky dispersion liquid; 30
oUnder the temperature of C and 60% the relative air humidity condition, polysulphone super-filter membrane was flooded 2 minutes in above-mentioned dispersion liquid, take out and get rid of surperficial excess solution, be placed on again in the baking oven, 60
oCrosslinking curing is 2 hours under the C, obtains composite nanometer filtering film.This composite nanometer filtering film is at 25 ℃, under the 0.6MPa pressure, for 1g.L
-1NaCl, K
2SO
4, PEG600 and PEG800 solution separating resulting be: the rejection to NaCl is 12.8%, to K
2SO
4Rejection be 18.5%; Rejection to PEG600 is 81.5%; Rejection to PEG800 is 90.5%, and water flux is 27.8L.m
-2.h
-1
Embodiment 3:
3-[N with 6 mass parts, N-dimethyl-[2-(2-methyl-prop-2-alkene acyloxy) ethyl] ammonium] the hydroxyethyl methacrylate monomer of propane-1-acid inner salt and 1 mass parts is added to the water, be made into the aqueous solution that mass percent concentration is 20wt%, feed nitrogen, the adding mass percent concentration is 2% oxidation-reduction initiator K
2S
2O
8And NaHSO
3(1:1), 40
oCarry out polymerisation in solution under the C, polymerization time is 2 hours, through repeatedly centrifugal, the washing after, obtain containing zwitterionic bipolymer, standby after the vacuum drying; The glutaraldehyde of zwitterionic bipolymer and 0.3 mass parts is added to the water dispersion with containing of 2 mass parts, and adding sulfuric acid regulation solution pH value again is 1.8,25
oStirred 30 minutes under the temperature of C, obtain milky dispersion liquid; 25
oUnder the temperature of C and 50% the relative air humidity condition, polysulphone super-filter membrane was flooded 2 minutes in above-mentioned dispersion liquid, take out and get rid of surperficial excess solution, be placed on again in the baking oven, 40
oCrosslinking curing is 4 hours under the C, obtains composite nanometer filtering film.This composite nanometer filtering film is at 25 ℃, under the 0.6MPa pressure, for 1g.L
-1NaCl, K
2SO
4, PEG600 and PEG800 solution separating resulting be: the rejection to NaCl is 15.6%, to K
2SO
4Rejection be 16.2%; Rejection to PEG600 is 85.5%; Rejection to PEG800 is 92.4%, and water flux is 28.5L.m
-2.h
-1
Embodiment 4:
3-[N with 6 mass parts, N-dimethyl-[2-(2-methyl-prop-2-alkene acyloxy) ethyl] ammonium] the hydroxy-ethyl acrylate monomer of propane-1-acid inner salt and 1 mass parts is added to the water, be made into the aqueous solution that mass percent concentration is 20wt%, feed nitrogen, the adding mass percent concentration is 2% oxidation-reduction initiator K
2S
2O
8And NaHSO
3(1:1), 40
oCarry out polymerisation in solution under the C, polymerization time is 2 hours, through repeatedly centrifugal, the washing after, obtain containing zwitterionic bipolymer, standby after the vacuum drying; The glutaraldehyde of zwitterionic bipolymer and 0.3 mass parts is added to the water dispersion with containing of 2 mass parts, and adding hydrochloric acid conditioning solution pH value again is 1.8,25
oStirred 30 minutes under the temperature of C, obtain milky dispersion liquid; 25
oUnder the temperature of C and 50% the relative air humidity condition, polysulphone super-filter membrane was flooded 2 minutes in above-mentioned dispersion liquid, take out and get rid of surperficial excess solution, be placed on again in the baking oven, 50
oCrosslinking curing is 3 hours under the C, obtains composite nanometer filtering film.This composite nanometer filtering film is at 25 ℃, under the 0.6MPa pressure, for 1g.L
-1NaCl, K
2SO
4, PEG600 and PEG800 solution separating resulting be: the rejection to NaCl is 15.6%, to K
2SO
4Rejection be 16.2%; Rejection to PEG600 is 87.5%; Rejection to PEG800 is 96.4%, and water flux is 24.5L.m
-2.h
-1
Embodiment 5:
3-[N with 6 mass parts, N-dimethyl-[2-(2-methyl-prop-2-alkene acyloxy) ethyl] ammonium] the hydroxy-ethyl acrylate monomer of propane-1-acid inner salt and 1 mass parts is added to the water, be made into the aqueous solution that mass percent concentration is 20wt%, feed nitrogen, the adding mass percent concentration is 2% oxidation-reduction initiator K
2S
2O
8And NaHSO
3(1:1), 40
oCarry out polymerisation in solution under the C, polymerization time is 2 hours, through repeatedly centrifugal, the washing after, obtain containing zwitterionic bipolymer, standby after the vacuum drying; The MDA of zwitterionic bipolymer and 0.3 mass parts is added to the water dispersion with containing of 2 mass parts, and adding sulfuric acid regulation solution pH value again is 2.5,25
oStirred 30 minutes under the temperature of C, obtain milky dispersion liquid; 25
oUnder the temperature of C and 50% the relative air humidity condition, polysulphone super-filter membrane was flooded 2 minutes in above-mentioned dispersion liquid, take out and get rid of surperficial excess solution, be placed on again in the baking oven, 50
oCrosslinking curing is 3 hours under the C, obtains composite nanometer filtering film.This composite nanometer filtering film is at 25 ℃, under the 0.6MPa pressure, for 1g.L
-1NaCl, K
2SO
4, PEG600 and PEG800 solution separating resulting be: the rejection to NaCl is 13.6%, to K
2SO
4Rejection be 18.2%; Rejection to PEG600 is 83.5%; Rejection to PEG800 is 93.4%, and water flux is 26.5L.m
-2.h
-1
Embodiment 6:
3-[N with 3 mass parts, N-dimethyl-[2-(2-methyl-prop-2-alkene acyloxy) ethyl] ammonium] the hydroxy propyl methacrylate monomer of propane-1-acid inner salt and 1 mass parts is added to the water, be made into the aqueous solution that mass percent concentration is 20wt%, feed nitrogen, the adding mass percent concentration is 2% oxidation-reduction initiator K
2S
2O
8And NaHSO
3(1:1), 40
oCarry out polymerisation in solution under the C, polymerization time is 2 hours, through repeatedly centrifugal, the washing after, obtain containing zwitterionic bipolymer, standby after the vacuum drying; The glutaraldehyde of zwitterionic bipolymer and 0.3 mass parts is added to the water dispersion with containing of 2 mass parts, and adding sulfuric acid regulation solution pH value again is 2,25
oStirred 30 minutes under the temperature of C, obtain milky dispersion liquid; 25
oUnder the temperature of C and 50% the relative air humidity condition, polysulphone super-filter membrane was flooded 2 minutes in above-mentioned dispersion liquid, take out and get rid of surperficial excess solution, be placed on again in the baking oven, 50
oCrosslinking curing is 3 hours under the C, obtains composite nanometer filtering film.This composite nanometer filtering film is at 25 ℃, under the 0.6MPa pressure, for 1g.L
-1NaCl, K
2SO
4, PEG600 and PEG800 solution separating resulting be: the rejection to NaCl is 17.2 %, to K
2SO
4Rejection be 19.5%; Rejection to PEG600 is 87.5%; Rejection to PEG800 is 96.8%, and water flux is 27.3L.m
-2.h
-1
Embodiment 7:
3-[N with 4 mass parts, N-dimethyl-[2-(2-methyl-prop-2-alkene acyloxy) ethyl] ammonium] the hydroxy-ethyl acrylate monomer of propane-1-acid inner salt and 1 mass parts is added to the water, be made into the aqueous solution that mass percent concentration is 20wt%, feed nitrogen, the adding mass percent concentration is 2% oxidation-reduction initiator K
2S
2O
8And NaHSO
3(1:1), 40
oCarry out polymerisation in solution under the C, polymerization time is 2 hours, through repeatedly centrifugal, the washing after, obtain containing zwitterionic bipolymer, standby after the vacuum drying; The glutaraldehyde of zwitterionic bipolymer and 0.3 mass parts is added to the water dispersion with containing of 2 mass parts, and adding sulfuric acid regulation solution pH value again is 2.5,25
oStirred 30 minutes under the temperature of C, obtain milky dispersion liquid; 25
oUnder the temperature of C and 50% the relative air humidity condition, polysulphone super-filter membrane was flooded 2 minutes in above-mentioned dispersion liquid, take out and get rid of surperficial excess solution, be placed on again in the baking oven, 50
oCrosslinking curing is 3 hours under the C, obtains composite nanometer filtering film.This composite nanometer filtering film is at 25 ℃, under the 0.6MPa pressure, for 1g.L
-1NaCl, K
2SO
4, PEG600 and PEG800 solution separating resulting be: the rejection to NaCl is 16.8%, to K
2SO
4Rejection be 18.5%; Rejection to PEG600 is 87.2%; Rejection to PEG800 is 95.6%, and water flux is 28.3L.m
-2.h
-1
Embodiment 8:
3-[N with 5 mass parts, N-dimethyl-[2-(2-methyl-prop-2-alkene acyloxy) ethyl] ammonium] the hydroxy-ethyl acrylate monomer of propane-1-acid inner salt and 1 mass parts is added to the water, be made into the aqueous solution that mass percent concentration is 20wt%, feed nitrogen, the adding mass percent concentration is 2% oxidation-reduction initiator K
2S
2O
8And NaHSO
3(1:1), 40
oCarry out polymerisation in solution under the C, polymerization time is 2 hours, through repeatedly centrifugal, the washing after, obtain containing zwitterionic bipolymer, standby after the vacuum drying; The polyaldehyde of zwitterionic bipolymer and 0.3 mass parts is added to the water dispersion with containing of 2 mass parts, and adding sulfuric acid regulation solution pH value again is 2,25
oStirred 30 minutes under the temperature of C, obtain milky dispersion liquid; 25
oUnder the temperature of C and 50% the relative air humidity condition, polysulphone super-filter membrane was flooded 2 minutes in above-mentioned dispersion liquid, take out and get rid of surperficial excess solution, be placed on again in the baking oven, 50
oCrosslinking curing is 3 hours under the C, obtains composite nanometer filtering film.This composite nanometer filtering film is at 25 ℃, under the 0.6MPa pressure, for 1g.L
-1NaCl, K
2SO
4, PEG600 and PEG800 solution separating resulting be: the rejection to NaCl is 18.0%, to K
2SO
4Rejection be 19.1%; Rejection to PEG600 is 86.9%; Rejection to PEG800 is 96.8 %, and water flux is 28.6L.m
-2.h
-1
Claims (6)
1. preparation method for separating of the NF membrane of organic matter and salt is characterized in that its step is as follows:
1) monomer that contains the amphion group of 3～6 mass parts and the hydroxyalkyl acrylate monomer of 1 mass parts are added to the water, be made into the aqueous solution that mass percent concentration is 10～30wt%, feed nitrogen, adding mass percent concentration is water soluble oxidized-reduction initator of 1～3wt%, 30～45
oCarry out polymerisation in solution under the C, polymerization time is 1～5 hour, through repeatedly centrifugal, the washing after, obtain containing zwitterionic bipolymer, standby after the vacuum drying;
2) 1～2.5 mass parts above-mentioned contained zwitterionic bipolymer, the polyaldehyde of 0.1～0.45 mass parts is added to the water dispersion, and adding inorganic acid regulator solution pH value again is 1.8～3.8,20～30
oStirred under the temperature of C 20～40 minutes, and obtained milky dispersion liquid;
3) 20～30
oUnder the temperature of C and 50～60% the relative air humidity condition, polysulphone super-filter membrane was flooded in above-mentioned dispersion liquid 2～5 minutes, take out and get rid of surperficial excess solution, again it is positioned over 40～60
oIn the baking oven of C temperature 2～4 hours, obtain containing zwitterionic composite nanometer filtering film;
The monomer that contains the amphion group described in the step 1) is 3-[N, N-dimethyl-[2-(2-methyl-prop-2-alkene acyloxy) ethyl] ammonium] propane-1-acid inner salt, 2-[N, N-dimethyl-[2-(2-methyl-prop-2-alkene acyloxy) ethyl] ammonium] ethane-1-carboxylic acid inner salt or 3-(4-vinylpridine) propane-1-carboxylic acid inner salt.
2. the preparation method of a kind of NF membrane for separating of organic matter and salt according to claim 1 is characterized in that the hydroxyalkyl acrylate monomer described in the step 1) is hydroxy-ethyl acrylate, hydroxyethyl methacrylate or hydroxy propyl methacrylate.
3. the preparation method of a kind of NF membrane for separating of organic matter and salt according to claim 1, it is characterized in that the oxidant in the oxidation-reduction initiator described in the step 1) is ammonium persulfate or potassium peroxydisulfate, reducing agent in the described oxidation-reduction initiator is sodium hydrogensulfite, and the mass ratio of Oxidizing and Reducing Agents is 1:1.
4. the preparation method of a kind of NF membrane for separating of organic matter and salt according to claim 1 is characterized in that step 2) described in polyaldehyde be MDA, glutaraldehyde, butanedial or hexandial.
5. the preparation method of a kind of NF membrane for separating of organic matter and salt according to claim 1 is characterized in that step 2) described in inorganic acid be sulfuric acid or hydrochloric acid.
6. the NF membrane for separating of organic matter and salt of the preparation method of an a kind of NF membrane for separating of organic matter and salt according to claim 1 preparation is characterized in that being by the porous polysulfone supporting layer and containing the compound NF membrane that zwitterionic bipolymer is functional layer.
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| WO2020231797A1 (en) * | 2019-05-10 | 2020-11-19 | Trustees Of Tufts College | Zwitterionic charged copolymer membranes |
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