CN108392991A - A kind of compound forward osmosis membrane of waste water desalination polyamide - Google Patents

A kind of compound forward osmosis membrane of waste water desalination polyamide Download PDF

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CN108392991A
CN108392991A CN201810337743.6A CN201810337743A CN108392991A CN 108392991 A CN108392991 A CN 108392991A CN 201810337743 A CN201810337743 A CN 201810337743A CN 108392991 A CN108392991 A CN 108392991A
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polyamide
separating layer
polysulfones
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CN108392991B (en
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延怀军
彭玉忠
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However, Hainan environmental protection science and technology limited company
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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
    • B01D69/12—Composite membranes; Ultra-thin membranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
    • B01D67/0002—Organic membrane manufacture
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
    • B01D67/0002—Organic membrane manufacture
    • B01D67/0006—Organic membrane manufacture by chemical reactions
    • 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
    • B01D69/10—Supported membranes; Membrane supports
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/445—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by forward osmosis
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y02A20/131—Reverse-osmosis

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

The present invention provides a kind of high-throughput waste water desalination polyamide forward osmosis membranes, by the composite polyamide forward osmosis membrane for devising the sandwich structure with unsymmetric structure, high-throughput polyamide separating layer and highly selective polyamide separating layer have been separately designed in the both sides of polysulfones supporting course, and then poly-dopamine modified lithium is carried out on the polysulfones face of the highly selective PA membrane of interfacial polymerization, the water flux of film has been obviously improved on the basis of solute does not enter supporting course in ensureing material liquid, and water phase to double-layer polyamide separating layer and oil phase monomer type have carried out selection to ensure that film properties are best.

Description

A kind of compound forward osmosis membrane of waste water desalination polyamide
Technical field
This application involves a kind of forward osmosis membranes, and in particular to a kind of forward osmosis membrane of waste water desalination.
Background technology
In August, 2015, World Resources Institute have issued the year two thousand forty national water resources pressure ranking, it is contemplated that China will therefrom It is reply Water Resources Pressure that equal Water Resources Pressures country, which becomes high Water Resources Pressure country, and countries in the world are constantly reinforced at water The R＆D intensity in reason field, various water technologies are developed in succession, and the wherein technologies such as reclaimed water reuse, sea water desalination are extensive Using.
As the important support technology of water treatment field, micro-filtration (MF), ultrafiltration (UF), nanofiltration (NF), reverse osmosis (RO) etc. Membrane Separation for Water Treatment has more commercial applications by long-term development, has been played in water treatment field very important Continuous propulsions of the with national economy Transformation Strategy is acted on, the environmental requirements such as " energy-saving and emission-reduction ", " zero-emission " are continuously improved, energy The lower, water quality of consumption is more excellent and the higher water reuse technology of the rate of recovery there is an urgent need for development.Positive infiltration technology, as novel " zero-emission " skill The key technology of art, because it has many advantages, such as that low energy consumption, fouling membrane is small, the high extensive pass by domestic and foreign scholars of the water rate of recovery Note
Positive infiltration refers to the process of that water is flowed to by permoselective membrane compared with hyperosmosis side from compared with Hyposmolality side.Relatively For the common nanofiltration of desalination, reverse osmosis membrane materials, low energy consumption for positive infiltration technology, film is not easy to pollute, easy cleaning, long lifespan, In recent years persistently by the extensive concern of domestic and foreign scholars.Ideal forward osmosis membrane should have finer and close separating layer and conveying Supporting course to reduce film internal concentration polarization phenomenon.And film infiltration drive can be reduced by being happened at the interior concentration polarization inside supporting course Power.For the problem, generally use reduces the mode of film thickness at present is limited with expecting utmostly to reduce concentration polarization, but The reduction of film-strength can be brought by being the reduction of bearing layer thickness, and selective reduction can be brought by detaching the reduction of layer thickness.Also have Scholar proposes the symmetrical sandwich structure using double cortexes, and this method can solute enters supporter in material liquid by stopping It is interior to alleviate concentration polarization degree in film, but due to its relative to a layer separation layer more than traditional forward osmosis membrane therefore Flux is simultaneously pessimistic.
Invention content
For concentration polarization problem in film, the present invention provides a kind of forward osmosis membranes, are designed with its special film layer to drop Low concentration polarization phenomenon, and utmostly ensure the flux of film.
The present invention provides a kind of high-throughput waste water desalination polyamide forward osmosis membranes, it is characterised in that：Described just oozes Permeable membrane includes polysulfones supporting course and the polyamide separating layer positioned at polysulfones supporting course both sides, and the polyamide separating layer is included in High-throughput polyamide separating layer in application process towards feed side and the highly selective polyamide separating layer towards per-meate side.Its In, high-throughput polyamide separating layer has higher water flux, and highly selective polyamide than highly selective polyamide separating layer Separating layer has higher selectivity than high-throughput polyamide separating layer.Preferably, it is bonded with highly selective polyamide separating layer Polysulfones supporting course side carry out poly-dopamine modified lithium after again interfacial polymerization at highly selective polyamide separating layer.
Preferably, the high-throughput polyamide separating layer and when highly selective polyamide separating layer, pass through interfacial polymerization side It is prepared by method.
Preferably, the high-throughput PA membrane is formed by four formyl chloride of equal benzene and piperazine interfacial polymerization.
Preferably, the highly selective polyamide separating layer is by equal benzene front three chlorine and m-phenylene diamine (MPD) interfacial polymerization At.
The present invention also provides a kind of method of the above-mentioned compound forward osmosis membrane of waste water desalination polyamide of synthesis, feature exists In comprising the steps of：
（1）The polysulfones of 15-20wt% is dissolved in n,N-dimethylacetamide, and adds the polyethylene glycol-400 of 4-12wt%, Heating stirring makes it completely dissolved, and standing and defoaming obtains casting solution for 24 hours at room temperature, and casting solution is cast to clean glass using scraper In glass plate, quick level is put into coagulating bath taking-up acquisition polysulfones supporting course after gel 1h after standing 12h in air；
（2）By poly-dopamine（0.01-0.05wt%）It is dissolved in formation poly-dopamine modified lithium liquid, polysulfones branch in tris-HCl solution The sides B for holding layer are immersed in poly-dopamine modified lithium liquid 3-6h to be modified to the sides polysulfones supporting course B；
（3）In deionized water by a certain amount of piperazine and m-phenylene diamine (MPD), sodium hydroxide and dodecyl sodium sulfate dissolving, stirring The first aqueous phase monomers are formed after uniformly；A certain amount of four formyl chloride of equal benzene, m-phthaloyl chloride are dissolved in alkane solvent, stirred The first oil phase monomer is formed after mixing uniformly；A certain amount of m-phenylene diamine (MPD), sodium hydroxide and dodecyl sodium sulfate are dissolved in In ionized water, it is mixing uniformly to form the second aqueous phase monomers；A certain amount of pyromellitic trimethylsilyl chloride is dissolved in alkane solvent, is stirred The second oil phase monomer is formed after mixing uniformly；
（4）The sides A of polysulfones supporting course are immersed in the first aqueous phase monomers, are taken out after 2-5s, are continued after removing excess surface solution Its side A is immersed in the first oil phase monomer, is taken out after 2-5s and drying generates high-throughput aramid layer；
（5）The sides B of polysulfones supporting course are immersed in the second aqueous phase monomers, are taken out after 5-10s, are continued after removing excess surface solution Its side B is immersed in the second oil phase monomer, is taken out after 5-10s and drying generates highly selective aramid layer.
Preferably, the m-phenylene diamine (MPD) of the piperazine containing 1-2wt% and 0.5-1wt%, 0.3- in first aqueous phase monomers The dodecyl sodium sulfate of 1wt% sodium hydroxides and 0.1-0.5%；Equal benzene four containing 2-3wt% in first oil phase monomer The m-phthaloyl chloride of formyl chloride, 1-2wt%.
Preferably, the m-phenylene diamine (MPD) containing 1-4wt% in second aqueous phase monomers, 0.3-1wt% sodium hydroxides and The dodecyl sodium sulfate of 0.1-0.5%；Pyromellitic trimethylsilyl chloride containing 1-3wt% in second oil phase monomer.
Technique effect
1. in one layer of polyamide film layer of the equal interfacial polymerization in polysulfones supporting course both sides, solute in material liquid is effectively prevented to enter branch It holds in layer, alleviates the concentration polarization degree in supporting course.
2. to reduce the problem of flux that double layer separation layer is brought is reduced, the present invention is devising high throughput towards feed side Polyamide separating layer is devising highly selective polyamide separating layer towards per-meate side.The aramid layer of supporting course both sides has Different permeance properties, compares, and the flux of high-throughput polyamide separating layer is higher, and selectivity is poor, and highly selective polyamides The selectivity of amine layer is higher, and flux is general.Accordingly, with respect to double cortexes using symmetrical structure, the present invention can be by that will cause Close separating layer replaces with high-throughput separating layer, can equally stop that solute enters in supporting course in material liquid, also significantly carries The high flux of film.It should be noted that relative to single layer polyamide separating layer, certain situation is kept in separating layer overall thickness Under, since the presence of high-throughput aramid layer leads to being obviously improved for flux.
3. and being directed in the design of high-throughput aramid layer and highly selective aramid layer, list of the present invention to both synthesis Selection is optimized in body type, in specific cross-over experiment, respectively to conventionally employed aqueous phase monomers piperazine, isophthalic two Amine, ethylenediamine, p-phenylenediamine, polyethyleneimine, polyvinyl alcohol, bisphenol-A and oil phase monomer m-phthaloyl chloride, paraphenylene terephthalamide Chlorine and pyromellitic trimethylsilyl chloride, four formyl chloride of equal benzene are investigated, in integrated survey permselective property, flux and stability On the basis of, select oil phase and aqueous phase monomers best used by double-layer polyamide separating layer.
4. the side that the present invention also supports the highly selective permeable membrane of layers of polymer in polysulfones has carried out poly-dopamine modified lithium, one Aspect improves the hydrophily of film, and poly-dopamine reacts the combination for improving film and polysulfones supporting course with aqueous monomers amine Power.And it is high-throughput polyamide separation layer surface, the faces polysulfones supporting course A for modified end face（The high-throughput polyamide point of polymerization The one side of absciss layer）, the faces polysulfones supporting course B（It polymerize the one side of highly selective polyamide separating layer）, the separation of highly selective polyamide Five positions in surface and entire polysulfones supporting course of layer are investigated, when discovery is only modified the faces polysulfones supporting course B Water flux does not rise anti-drop and is supported to entire polysulfones when could promote the water flux of film, and be modified to the above two surface Layer finds that flux is not obviously improved after being modified, due to when to high-throughput polyamide separation layer surface, polysulfones when this is possible The faces supporting course A and entire polysulfones supporting course carry out inhibiting transmission of the water in polysulfones supporting course when hydrophilic modifying, and to height The modification water flux of selective polyamide separating layer equally reduces, this is because its hydrophilic layer exacerbates per-meate side in per-meate side Outer concentration polarization degree, reduce water by power source.
Specific implementation mode
Technological means, character of innovation, reached purpose and effect to make the present invention realize are easy to understand, below to this Invention further illustrates.
Embodiment 1
（1）The polysulfones of 20wt% is dissolved in n,N-dimethylacetamide, and adds the polyethylene glycol-400 of 8wt%, heating is stirred It mixes and makes it completely dissolved, standing and defoaming obtains casting solution for 24 hours at room temperature, and casting solution is cast to cleaned glass plate using scraper On, quick level is put into coagulating bath taking-up acquisition polysulfones supporting course after gel 1h after standing 12h in air；
（2）By the m-phenylene diamine (MPD) of the piperazine of 2wt% and 0.5wt%, the dodecyl sodium sulfate of 0.5wt% sodium hydroxide and 0.2wt% Dissolving in deionized water, is mixing uniformly to form the first aqueous phase monomers；By the isophthalic two of four formyl chloride of equal benzene of 2wt%, 2wt% Formyl chloride is dissolved in alkane solvent, is mixing uniformly to form the first oil phase monomer；By the m-phenylene diamine (MPD) of 4wt%, 0.5wt% hydrogen-oxygens The dodecyl sodium sulfate for changing sodium and 0.2wt% dissolves in deionized water, is mixing uniformly to form the second aqueous phase monomers；By one Quantitative pyromellitic trimethylsilyl chloride is dissolved in alkane solvent, is mixing uniformly to form the second oil phase monomer；
（3）The sides A of polysulfones supporting course are immersed in the first aqueous phase monomers, are taken out after 2s, remove continue after excess surface solution by Its side A is immersed in the first oil phase monomer, is taken out after 2s and drying generates high-throughput aramid layer；
（4）The sides B of polysulfones supporting course are immersed in the second aqueous phase monomers, are taken out after 5s, remove continue after excess surface solution by Its side B is immersed in the second oil phase monomer, is taken out after 5s and the dry highly selective aramid layer of generation is to prepare forward osmosis membrane；
（5）The unreacted reactant in above-mentioned forward osmosis membrane is washed with deionized, and continues to impregnate and carries out performance characterization afterwards for 24 hours.
By the forward osmosis membrane of preparation using 0.1mol/L sodium chloride as material liquid, 4mol/L glucose solutions are to draw liquid, The flux measured at room temperature is 15Lm2/ h, the rejection 99.4% of sodium chloride.
Comparative example 1
The preparation method and embodiment 1 that the comparative example uses are substantially similar, in addition to the first aqueous phase monomers and the second aqueous phase monomers are equal Be the m-phenylene diamine (MPD) of 4wt%, 0.5wt% sodium hydroxides and 0.2wt% dodecyl sodium sulfate dissolving in deionized water, stirring It is formed after uniformly；First oil phase monomer and the second oil phase monomer are that a certain amount of pyromellitic trimethylsilyl chloride is dissolved in alkane solvent In, it is mixing uniformly to form.
By the forward osmosis membrane of preparation using 0.1mol/L sodium chloride as material liquid, 4mol/L glucose solutions are to draw liquid, The flux measured at room temperature is 9.8Lm2/ h, the rejection 99.5% of sodium chloride.
Embodiment 2
（1）The polysulfones of 20wt% is dissolved in n,N-dimethylacetamide, and adds the polyethylene glycol-400 of 8wt%, heating is stirred It mixes and makes it completely dissolved, standing and defoaming obtains casting solution for 24 hours at room temperature, and casting solution is cast to cleaned glass plate using scraper On, quick level is put into coagulating bath taking-up acquisition polysulfones supporting course after gel 1h after standing 12h in air；
（2）Poly-dopamine is dissolved in formation poly-dopamine modified lithium liquid in tris-HCl solution, the sides B of polysulfones supporting course are immersed in Poly-dopamine modified lithium liquid 3h is to be modified the sides polysulfones supporting course B, and the wherein pH of tris-HCl solution is 8.5, poly-dopamine Mass concentration be 0.04wt%；
（3）By the m-phenylene diamine (MPD) of the piperazine of 2wt% and 0.5wt%, the dodecyl sodium sulfate of 0.5wt% sodium hydroxide and 0.2wt% Dissolving in deionized water, is mixing uniformly to form the first aqueous phase monomers；By the isophthalic two of four formyl chloride of equal benzene of 2wt%, 2wt% Formyl chloride is dissolved in alkane solvent, is mixing uniformly to form the first oil phase monomer；By the m-phenylene diamine (MPD) of 4wt%, 0.5wt% hydrogen-oxygens The dodecyl sodium sulfate for changing sodium and 0.2wt% dissolves in deionized water, is mixing uniformly to form the second aqueous phase monomers；By one Quantitative pyromellitic trimethylsilyl chloride is dissolved in alkane solvent, is mixing uniformly to form the second oil phase monomer；
（4）The sides A of polysulfones supporting course are immersed in the first aqueous phase monomers, are taken out after 2s, remove continue after excess surface solution by Its side A is immersed in the first oil phase monomer, is taken out after 2s and drying generates high-throughput aramid layer；
（5）The sides B of polysulfones supporting course are immersed in the second aqueous phase monomers, are taken out after 5s, remove continue after excess surface solution by Its side B is immersed in the second oil phase monomer, is taken out after 5s and the dry highly selective aramid layer of generation is to prepare forward osmosis membrane；
（6）The unreacted reactant in above-mentioned forward osmosis membrane is washed with deionized, and continues to impregnate and carries out performance characterization afterwards for 24 hours.
By the forward osmosis membrane of preparation using 0.1mol/L sodium chloride as material liquid, 4mol/L glucose solutions are to draw liquid, The flux measured at room temperature is 26.9Lm2/ h, the rejection 99.3% of sodium chloride.
Comparative example 2
The preparation method and embodiment 2 that the comparative example uses are substantially similar, in addition to step（2）The middle poly-dopamine modified lithium that carries out is The sides A of polysulfones supporting course.
By the forward osmosis membrane of preparation using 0.1mol/L sodium chloride as material liquid, 4mol/L glucose solutions are to draw liquid, The flux measured at room temperature is 11.2 Lm2/ h, the rejection 99.3% of sodium chloride.
Comparative example 3
The preparation method and embodiment 2 that the comparative example uses are substantially similar, in addition to step（2）The middle poly-dopamine modified lithium that carries out is The two sides of polysulfones supporting course.
By the forward osmosis membrane of preparation using 0.1mol/L sodium chloride as material liquid, 4mol/L glucose solutions are to draw liquid, The flux measured at room temperature is 16.1 Lm2/ h, the rejection 99.4% of sodium chloride.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.

Claims (7)

1. a kind of compound forward osmosis membrane of waste water desalination polyamide, it is characterised in that：The forward osmosis membrane includes polysulfones bearing Layer and the polyamide separating layer positioned at polysulfones supporting course both sides, the polyamide separating layer include in application process towards original The high-throughput polyamide separating layer of side and the highly selective polyamide separating layer towards per-meate side are expected, wherein with highly selective polyamides Interfacial polymerization is detached at highly selective polyamide again after the polysulfones supporting course side progress poly-dopamine modified lithium of amine separating layer fitting Layer.
2. film according to claim 1, it is characterised in that the high-throughput polyamide separating layer and highly selective polyamides It is prepared by interfacial polymerization method when amine separating layer.
3. film according to claim 1, it is characterised in that the high-throughput PA membrane be by four formyl chloride of equal benzene, The mixing oil phase monomer and piperazine of m-phthaloyl chloride, the mixing water phase monomer interface of m-phenylene diamine (MPD) are polymerized.
4. film according to claim 1, it is characterised in that the highly selective polyamide separating layer is by equal benzene three First chlorine and m-phenylene diamine (MPD) interfacial polymerization form.
5. a kind of method of synthesis high-throughput waste water desalination polyamide forward osmosis membrane described in claim 1, it is characterised in that It comprises the steps of：
（1）The polysulfones of 15-20wt% is dissolved in n,N-dimethylacetamide, and adds the polyethylene glycol-400 of 4-12wt%, Heating stirring makes it completely dissolved, and standing and defoaming obtains casting solution for 24 hours at room temperature, and casting solution is cast to clean glass using scraper In glass plate, quick level is put into coagulating bath taking-up acquisition polysulfones supporting course after gel 1h after standing 12h in air；
（2）Poly-dopamine is dissolved in formation poly-dopamine modified lithium liquid in tris-HCl solution, the sides B of polysulfones supporting course are immersed in Poly-dopamine modified lithium liquid 3-6h is to be modified the sides polysulfones supporting course B；
（3）In deionized water by a certain amount of piperazine and m-phenylene diamine (MPD), sodium hydroxide and dodecyl sodium sulfate dissolving, stirring The first aqueous phase monomers are formed after uniformly；A certain amount of four formyl chloride of equal benzene, m-phthaloyl chloride are dissolved in alkane solvent, stirred The first oil phase monomer is formed after mixing uniformly；A certain amount of m-phenylene diamine (MPD), sodium hydroxide and dodecyl sodium sulfate are dissolved in In ionized water, it is mixing uniformly to form the second aqueous phase monomers；A certain amount of pyromellitic trimethylsilyl chloride is dissolved in alkane solvent, is stirred The second oil phase monomer is formed after mixing uniformly；
（4）The sides A of polysulfones supporting course are immersed in the first aqueous phase monomers, are taken out after 2-5s, are continued after removing excess surface solution Its side A is immersed in the first oil phase monomer, is taken out after 2-5s and drying generates high-throughput aramid layer；
（5）The sides B of polysulfones supporting course are immersed in the second aqueous phase monomers, are taken out after 5-10s, are continued after removing excess surface solution Its side B is immersed in the second oil phase monomer, is taken out after 5-10s and drying generates highly selective aramid layer.
6. according to the method described in claim 5, it is characterized in that in step（1）、（2）Between also have step（1-1）According to Method of claim 6, it is characterised in that piperazine and 0.5-1wt% containing 1-2wt% in first aqueous phase monomers M-phenylene diamine (MPD), 0.3-1wt% sodium hydroxides and 0.1-0.5% dodecyl sodium sulfate；Contain in first oil phase monomer There are four formyl chloride of equal benzene of 2-3wt%, the m-phthaloyl chloride of 1-2wt%.
7. according to the method described in claim 5, it is characterized in that the isophthalic containing 1-4wt% in second aqueous phase monomers The dodecyl sodium sulfate of diamines, 0.3-1wt% sodium hydroxides and 0.1-0.5%；Contain 1- in second oil phase monomer The pyromellitic trimethylsilyl chloride of 3wt%.
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CN112516821A (en) * 2020-11-18 2021-03-19 西安科技大学 Dopamine and polyvinyl alcohol composite modified polysulfone forward osmosis membrane, preparation method and application
CN112516821B (en) * 2020-11-18 2022-07-22 西安科技大学 Dopamine and polyvinyl alcohol composite modified polysulfone forward osmosis membrane, preparation method and application
CN112808020A (en) * 2020-12-31 2021-05-18 华中科技大学 Forward osmosis base membrane with optimized surface charge on side of drawing solution and preparation method thereof
CN112808020B (en) * 2020-12-31 2022-08-02 华中科技大学 Forward osmosis base membrane with optimized surface charge on side of drawing solution and preparation method thereof
CN114471197A (en) * 2022-03-10 2022-05-13 中国科学院过程工程研究所 Mixed charged nanofiltration membrane as well as preparation method and application thereof

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