CN114768548A - Blending modified ultrafiltration membrane with pH response and preparation method thereof - Google Patents
Blending modified ultrafiltration membrane with pH response and preparation method thereof Download PDFInfo
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- 239000012528 membrane Substances 0.000 title claims abstract description 131
- 238000000108 ultra-filtration Methods 0.000 title claims abstract description 67
- 230000004044 response Effects 0.000 title claims abstract description 24
- 238000002156 mixing Methods 0.000 title claims abstract description 16
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000002131 composite material Substances 0.000 claims abstract description 33
- 239000000243 solution Substances 0.000 claims abstract description 32
- 229920002492 poly(sulfone) Polymers 0.000 claims abstract description 31
- 239000000758 substrate Substances 0.000 claims abstract description 26
- 229920002239 polyacrylonitrile Polymers 0.000 claims abstract description 20
- 238000005266 casting Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000011248 coating agent Substances 0.000 claims abstract description 10
- 238000000576 coating method Methods 0.000 claims abstract description 10
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- 239000003795 chemical substances by application Substances 0.000 claims abstract description 9
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- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 229920003023 plastic Polymers 0.000 claims abstract description 6
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 33
- 238000004528 spin coating Methods 0.000 claims description 13
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 8
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 8
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 8
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- 239000002202 Polyethylene glycol Substances 0.000 claims description 3
- 229920001223 polyethylene glycol Polymers 0.000 claims description 3
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 claims description 2
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 2
- 239000004088 foaming agent Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 abstract description 7
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 4
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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
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/145—Ultrafiltration
-
- 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
- B01D67/0009—Organic membrane manufacture by phase separation, sol-gel transition, evaporation or solvent quenching
- B01D67/0011—Casting solutions therefor
-
- 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
- B01D67/0009—Organic membrane manufacture by phase separation, sol-gel transition, evaporation or solvent quenching
- B01D67/0013—Casting processes
-
- 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
- B01D67/0009—Organic membrane manufacture by phase separation, sol-gel transition, evaporation or solvent quenching
- B01D67/0016—Coagulation
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Dispersion Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Water Supply & Treatment (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a preparation method of a blending modified ultrafiltration membrane with pH response and an ultrafiltration membrane with pH response prepared by the preparation method, belonging to the technical field of ultrafiltration membranes. The method is characterized in that polyacrylonitrile powder is mixed in polysulfone solution, and the ultrafiltration membrane is prepared through immersion precipitation phase transition (NIPS). The preparation method comprises the following steps: dissolving polyacrylonitrile, pore-forming agent and polysulfone in organic solvent, stirring at 70-90 deg.C until completely dissolved to obtain membrane casting solution; pouring the casting film liquid on a plastic substrate, rotationally coating, and quickly immersing the plastic substrate into a coagulating bath to obtain a composite film; and (3) placing the composite membrane in an alkaline solution, and heating the composite membrane in water bath at 70 ℃ to obtain the ultrafiltration membrane with pH response. The ultrafiltration membrane prepared by the invention can respond to pH and is highly reversible, and the formed membrane is relatively stable and can be observed for a long time.
Description
Technical Field
The invention relates to the technical field of ultrafiltration membranes. More particularly, the invention relates to a blending modified ultrafiltration membrane with pH response and a preparation method thereof.
Background
The ultrafiltration membrane is a pressure-driven type separation membrane which separates molecules having a size of 0.001 μm to 0.1 μm, such as colloidal particles, high molecular substances and inorganic polymer molecules. It has been widely used in many membrane separation processes, such as dialysis, food refining and water treatment. Polysulfone (PSF) materials have received much attention from researchers because of their thermal stability, mechanical strength, and chemical inertness. Non-solvent induced phase separation (NIPS) is the most commonly used method for preparing polysulfone ultrafiltration membranes. The surface of the polysulfone ultrafiltration membrane presents certain hydrophobicity, so that the polysulfone ultrafiltration membrane is not easy to pollute and the like due to low water flux, and further the application of the polysulfone ultrafiltration membrane is influenced. In order to improve the separation performance and the pollution resistance of the polysulfone ultrafiltration membrane, a plurality of researchers add some special materials into the membrane to change the physical morphology and/or the chemical structure of the membrane, so as to adjust the pore size of the membrane, the morphology of finger-shaped pores inside the membrane, the degree of looseness inside the membrane and the like. However, the problem of the performance regulation of the ultrafiltration membrane, especially the aspect of intelligent response, is always the direction that the modification research of the ultrafiltration membrane is easy to ignore. Research on smart-responsive ultrafiltration membranes, particularly pH-responsive ultrafiltration membranes, is not abundant at present.
At present, the main hydrophilization modification methods comprise physical blending, surface coating, surface grafting and adsorption modification, the main principles of the modification are that hydrophilic groups are introduced into the original system through different means, and the hydrophilic groups are combined with water molecules through hydrogen bonds, so that the hydrophilicity of the surface of the membrane is increased, and the pollution resistance of the membrane is improved. However, the efforts of existing ultrafiltration membranes in this direction are not significant with respect to membrane tunability, such as pH responsiveness. Patent CN102614788A discloses a preparation method of a polyethersulfone/graphene oxide composite membrane. Blending polyether sulfone and graphene oxide in an organic solvent, dispersing the graphene oxide by adopting ultrasonic, and finally forming a film by an immersion precipitation phase inversion method. Although the composite membrane obtained by the invention has good performances such as good hydrophilicity and the like, the graphene oxide is not uniformly dispersed in the membrane casting solution, the stability of the membrane performance is poor, the performance is not adjustable, and the pH responsiveness is not achieved.
Disclosure of Invention
It is an object of the present invention to address at least the above problems and to provide at least the advantages described hereinafter.
To achieve these objects and other advantages in accordance with the present invention, there is provided a method for preparing a blend-modified ultrafiltration membrane having pH response, comprising the steps of:
s1, dissolving polyacrylonitrile, pore-forming agent and polysulfone in an organic solvent, and stirring at 70-90 ℃ until the materials are completely dissolved to obtain a membrane casting solution;
s2, pouring the casting solution on a plastic substrate, rotationally coating, and quickly immersing the plastic substrate into a coagulating bath to obtain a composite film;
s3, placing the composite membrane in an alkaline solution, and heating the composite membrane in water bath at 70 ℃ to obtain the ultrafiltration membrane with pH response.
Preferably, the total mass portion of the polyacrylonitrile, the pore-forming agent and the polysulfone is 20-25%;
the content of polyacrylonitrile is 25% or less of the content of polysulfone;
the content of the pore-foaming agent is 40-60% of the total content of the polysulfone and the polyacrylonitrile.
More preferably, the mass fraction of the polyacrylonitrile is 3%, the mass fraction of the pore-forming agent is 8%, the mass fraction of the polysulfone is 12%, and the balance is an organic solvent.
Preferably, the polysulfone is dried at 70-90 ℃ for 6-10h under vacuum.
Preferably, the pore-forming agent is one of polyethylene glycol and polyvinylpyrrolidone.
Preferably, the organic solvent is one of N-methylpyrrolidone, N-dimethylformamide and N, N-dimethylacetamide.
Preferably, the thickness of the spin coating film is 190-210 μm, the spin rotation speed is 450-550r/min, and the spin time is 7-12 s.
Preferably, the composite membrane is replaced with water 2-3 times a day before being placed in the alkaline solution.
Preferably, the alkaline solution is a sodium hydroxide solution, and the sodium hydroxide solution contains 2-10% by mass of sodium hydroxide.
The invention also provides an ultrafiltration membrane with pH response prepared by the preparation method of the blending modified ultrafiltration membrane with pH response.
The invention at least comprises the following beneficial effects:
the selected film forming raw materials are easy to obtain, stable in chemical properties, green and non-toxic;
the selection range of the substrate is large, and the substrate is convenient to obtain;
the preparation method is simple in process, beneficial to reducing cost and capable of realizing industrial batch production, the water flux of the prepared ultrafiltration membrane is improved by 53% compared with that of a pure polysulfone ultrafiltration membrane, the prepared ultrafiltration membrane can respond to pH and is highly reversible, the ultrafiltration membrane is stable, and long-time observation can be realized.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic diagram of an infrared spectrum of an ultrafiltration membrane of the first embodiment;
FIG. 2 is a schematic of water flux for polysulfone ultrafiltration membranes, composite membranes, and pH responsive ultrafiltration membranes;
FIG. 3 is a schematic of water flux for pH responsiveness of the ultrafiltration membranes of composite membrane, ratio one, and comparative example two;
FIG. 4 is a diagram showing pH responsiveness and water flux under reversibility of an ultrafiltration membrane according to the first example.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified.
< first embodiment >
6g of polysulfone (a product of Shanghai Jinshan petrochemicals GmbH, molecular weight Mw 35000), 1.5g of polyacrylonitrile (a product of Chemicals GmbH, Mw 50000), 4g of polyvinylpyrrolidone (a product of Chemicals GmbH, Mw 58000) were blended with 37.3ml of N-methylpyrrolidone (a product of Chemicals GmbH, purity AR, 99.0% (GC)) at 80 ℃ until completely dissolved, to obtain a casting solution.
The method comprises the following steps of taking a transparent PMMA sheet (the diameter d is 9cm) as a substrate, placing the cleaned PMMA sheet on a rotary spin coater, placing the obtained casting solution on the substrate at room temperature, carrying out rotary coating at the spin coating speed n of 500r/min for the spin coating time of 9s, and then rapidly placing the carrier liquid substrate in deionized water to obtain the composite film.
And (3) hydrolyzing the obtained composite membrane in a sodium hydroxide solution with the mass fraction of 5% for 70min at 70 ℃ to obtain the ultrafiltration membrane. The infrared spectrum of the ultrafiltration membrane is shown in FIG. 1 and is 1593cm-1A peak occurs due to carboxyl absorption in the ultrafiltration membrane.
< example two >
Polysulfone (19 g, a product of Shanghai Jinshan petrochemicals having a molecular weight of Mw 35000), polyacrylonitrile (3 g, a product of Kanji K.K., having a molecular weight of Mw 58000) and polyvinylpyrrolidone (11 g, a molecular weight of Mw 58000) were blended in 113.e. with N-methylpyrrolidone (a product of purity of AR, Ar, purity of 99.e. purity ≥ 99.e. at 80 deg.e. at 80 deg.C) and mechanically stirred until completely dissolved, to obtain a casting solution.
Taking a transparent PMMA sheet (the diameter d is 12cm) as a substrate, placing the cleaned PMMA sheet on a rotary spin coater, placing the obtained casting solution on the substrate at room temperature, carrying out rotary coating at the spin coating speed n of 460r/min for 12s, and then rapidly placing the carrier liquid substrate in deionized water to obtain the composite film.
And (3) hydrolyzing the obtained composite membrane in 8% sodium hydroxide solution at 70 ℃ for 70min to obtain the ultrafiltration membrane.
< example three >
15g of polysulfone (a product purchased from Shanghai Jinshan petrochemicals Co., Ltd., molecular weight Mw of 35000), 3g of polyacrylonitrile (a product purchased from Kanji Kaishi, molecular weight Mw of 50000), and 10g of polyvinylpyrrolidone (a product purchased from Kanji Kaishi, molecular weight Mw of 58000) were blended with 118.2ml of N-methylpyrrolidone (a product purchased from Kanji Kaishi, purity AR, 99.0% (GC)) at 80 ℃ under mechanical stirring until completely dissolved to obtain a casting solution.
Taking a transparent PMMA sheet (the diameter d is 12cm) as a substrate, placing the cleaned PMMA sheet on a rotary spin coater, placing the obtained casting solution on the substrate at room temperature, carrying out rotary coating at the spin coating speed n of 530r/min for 7s, and then rapidly placing the liquid-carrying substrate in deionized water to obtain the composite film.
And (3) hydrolyzing the obtained composite membrane in a 10% sodium hydroxide solution at 70 ℃ for 70min to obtain the ultrafiltration membrane.
< example four >
15g of polysulfone (a product purchased from Shanghai Jinshan petrochemicals Co., Ltd., molecular weight Mw of 35000), 3g of polyacrylonitrile (a product purchased from Kanji) and 8g of polyethylene glycol (a product purchased from Kanji, 15g, with molecular weight of 35000, molecular weight of 10000) were mechanically stirred at 80 g, 3g, and 8g, and 0.
Taking a transparent PMMA sheet (the diameter d is 12cm) as a substrate, placing the cleaned PMMA sheet on a rotary spin coater, placing the obtained casting solution on the substrate at room temperature, carrying out rotary coating at the spin coating speed n of 530r/min for 7s, and then rapidly placing the liquid-carrying substrate in deionized water to obtain the composite film.
And (3) hydrolyzing the obtained composite membrane in a 10% sodium hydroxide solution at 70 ℃ for 70min to obtain the ultrafiltration membrane.
< comparative example one >
6g of polysulfone (a product purchased from Shanghai Jinshan petrochemicals Co., Ltd., molecular weight Mw of 35000), 1.5g of polyacrylonitrile (a product purchased from Kanji Kaisha Chemicals Co., Ltd., molecular weight Mw of 50000), and 4g of polyvinylpyrrolidone (a product purchased from Kanji, with molecular weight Mw of 58000) were mixed with 37.3ml of 1-methyl-2-pyrrolidone (a product purchased from Kanji, with stirring at 80 ℃ C., 37.e, respectively, and 4g of 1, and 4g of polyvinylpyrrolidone (molecular weight Mw of 58000) at 80 ℃ C., at 80, and 37.e, respectively, and 37.e, to obtain casting solution, and completely dissolved therein, to obtain casting solution.
The method comprises the following steps of taking a transparent PMMA sheet (the diameter d is 9cm) as a substrate, placing the cleaned PMMA sheet on a rotary spin coater, placing the obtained casting solution on the substrate at room temperature, carrying out rotary coating at the spin coating speed n of 500r/min for the spin coating time of 9s, and then rapidly placing the carrier liquid substrate in deionized water to obtain the composite film.
And (3) heating the obtained composite membrane in a nitric acid solution of 0.1mol/L in a water bath for 70min at 70 ℃ to obtain the ultrafiltration membrane.
< comparative example No. >
6g of polysulfone (a product purchased from Shanghai Jinshan petrochemicals, Inc., having a molecular weight Mw of 35000), 1.5g of polyacrylonitrile (a product purchased from Kagaku Chemicals, Inc., having a molecular weight Mw of 50000); 4g of polyvinylpyrrolidone (a product purchased from national chemical Co., Ltd., molecular weight Mw of 58000) was blended with 37.3ml of 1-methyl-2-pyrrolidone (a product purchased from national chemical Co., Ltd., purity AR, not less than 99.0% (GC)) at 80 ℃ and mechanically stirred until completely dissolved to obtain a casting solution.
The method comprises the following steps of taking a transparent PMMA sheet (the diameter d is 9cm) as a substrate, placing the cleaned PMMA sheet on a rotary spin coater, placing the obtained casting solution on the substrate at room temperature, carrying out rotary coating at the spin coating speed n of 500r/min for the spin coating time of 9s, and then rapidly placing the liquid-carrying substrate in deionized water to obtain the composite film.
And (3) heating the obtained composite membrane in a water bath in neutral deionized water at 70 ℃ for 70min to obtain the ultrafiltration membrane.
< method for testing Performance of Ultrafiltration Membrane >
The ultrafiltration membranes of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the first comparative embodiment and the second comparative embodiment are selected for performance test.
1. Water flux test
The flux of the anti-pollution blended ultrafiltration membrane is measured by adopting a water flux tester, the pH-responsive ultrafiltration membrane in the first embodiment, the polysulfone ultrafiltration membrane on the market and the composite membrane in the first embodiment are selected in the test process to test, and the test result is shown in figure 2.
As can be seen from fig. 1, the water flux of the composite membrane of the present application is improved to a certain extent compared to the polysulfone ultrafiltration membrane on the market, and the water flux of the pH-responsive ultrafiltration membrane obtained by heating the composite membrane in the alkaline solution in the water bath in the example i is further improved.
2. pH response test
And (3) selecting the composite membrane of the first embodiment and the ultrafiltration membranes prepared in the first and second comparative embodiments, soaking the composite membrane and the ultrafiltration membranes in deionized water at room temperature for 1h, then placing the membranes in a water flux tester, and measuring the standard value of the membrane flux in unit time. After the test is finished, the membrane is placed in a nitric acid solution with the pH value of 3 to be soaked for 1 hour at room temperature, and then the membrane is placed in a water flux tester to measure the membrane flux in unit time. After the test is finished, the membrane is repeatedly washed until the pH value of the washing liquid is neutral, then the membrane is placed in deionized water to be soaked for 1 hour at room temperature, and the membrane flux in unit time is measured.
After the test is completed, it can be seen from fig. 3 that the products prepared by the composite membrane, the comparative example one and the comparative example two do not have acidic pH responsiveness.
3. pH response and reversibility test
And (3) soaking the ultrafiltration membrane prepared in the first embodiment in deionized water at room temperature for 1h, then placing the membrane in a water flux tester, and measuring the standard value of the membrane flux in unit time. After the test is finished, the membrane is placed in a nitric acid solution with the pH value of 3 to be soaked for 1h at room temperature, and then the membrane is placed in a water flux tester to measure the membrane flux in unit time. And after the test is finished, repeatedly washing the membrane until the pH of the washing liquid is neutral, then placing the membrane in deionized water for soaking for 1 hour at room temperature, then placing the membrane in a sodium hydroxide solution with the pH value of 12 for soaking for 1 hour at room temperature, placing the membrane in a water flux tester after the test is finished, and measuring the membrane flux in unit time. And after the test is finished, repeatedly washing the membrane until the pH of the washing liquid is neutral, then soaking the membrane in deionized water at room temperature for 1h, then soaking the membrane in a nitric acid solution with the pH being 3 at room temperature for 1h, placing the membrane in a water flux tester after the test is finished, and measuring the membrane flux in unit time.
After the test is completed, as can be seen from fig. 4, the ultrafiltration membrane of example one has pH responsiveness and reversibility, which indicates that the alkaline solution hydrolysis is based on that-CN groups on the PAN (polyacrylonitrile) surface are first converted into-CONH2And then converted to a-COO-group, without the above-mentioned mechanism for acidic or neutral environment.
The blending modified ultrafiltration membrane with pH response prepared by the invention solves the problem that the blending modified ultrafiltration membrane can not be suitable for automatically adjusting selectivity and permeability, and the pH response group is generated by blending hydrophilic polymer and hydrolyzing, so that the regulation and control of the pH on the aperture of the filtration membrane are realized, and the pH response function and the water flux adjusting function of the ultrafiltration membrane are realized.
While embodiments of the invention have been described above, it is not intended to be limited to the details shown, particular embodiments, but rather to those skilled in the art, and it is to be understood that the invention is capable of numerous modifications and that various changes may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (10)
1. A preparation method of a blending modified ultrafiltration membrane with pH response is characterized by comprising the following steps:
s1, dissolving polyacrylonitrile, pore-forming agent and polysulfone in an organic solvent, and stirring at 70-90 ℃ until the materials are completely dissolved to obtain a membrane casting solution;
s2, pouring the casting solution on a plastic substrate, rotationally coating, and quickly immersing the plastic substrate into a coagulating bath to obtain a composite film;
s3, placing the composite membrane in an alkaline solution, and heating the composite membrane in water bath at 70 ℃ to obtain the ultrafiltration membrane with pH response.
2. The preparation method of the blending modified ultrafiltration membrane with pH response of claim 1, wherein the total mass portion of the polyacrylonitrile, the pore-forming agent and the polysulfone is 20-25%;
the content of polyacrylonitrile is 25% or less of the polysulfone content;
the content of the pore-foaming agent is 40% -60% of the total content of the polysulfone and the polyacrylonitrile.
3. The preparation method of the blending modified ultrafiltration membrane with pH response of claim 1, wherein the mass fraction of polyacrylonitrile is 3%, the mass fraction of the pore-forming agent is 8%, the mass fraction of polysulfone is 12%, and the balance is organic solvent.
4. The preparation method of the blending modified ultrafiltration membrane with pH response of claim 1, wherein the polysulfone is dried under vacuum at 70-90 ℃ for 6-10 h.
5. The method for preparing the blending modified ultrafiltration membrane with pH response of claim 1, wherein the pore-forming agent is one of polyethylene glycol and polyvinylpyrrolidone.
6. The method for preparing the pH-responsive blended modified ultrafiltration membrane according to claim 1, wherein the organic solvent is one of N-methylpyrrolidone, N-dimethylformamide and N, N-dimethylacetamide.
7. The method for preparing the blending modified ultrafiltration membrane with pH response of claim 1, wherein the thickness of the spin coating film is 190-210 μm, the spin coating rotation speed is 450-550r/min, and the spin coating time is 7-12 s.
8. The method for preparing the blending modified ultrafiltration membrane with pH response of claim 1, wherein the composite membrane is changed in water 2-3 times a day before being placed in the alkaline solution.
9. The method for preparing the pH-responsive blended modified ultrafiltration membrane according to claim 1, wherein the alkaline solution is a sodium hydroxide solution, and the sodium hydroxide solution contains 2-10% by mass of sodium hydroxide.
10. An ultrafiltration membrane having a pH response prepared by the method of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210528022.XA CN114768548A (en) | 2022-05-16 | 2022-05-16 | Blending modified ultrafiltration membrane with pH response and preparation method thereof |
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| CN117181024A (en) * | 2023-04-04 | 2023-12-08 | 赛普(杭州)过滤科技有限公司 | Ultrafiltration membrane with pH response switchable pore diameter and preparation method thereof |
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| CN101879418A (en) * | 2010-08-18 | 2010-11-10 | 天津工业大学 | Preparation method of polyvinylidene fluoride modified film |
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| CN101879418A (en) * | 2010-08-18 | 2010-11-10 | 天津工业大学 | Preparation method of polyvinylidene fluoride modified film |
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| CN117181024A (en) * | 2023-04-04 | 2023-12-08 | 赛普(杭州)过滤科技有限公司 | Ultrafiltration membrane with pH response switchable pore diameter and preparation method thereof |
| CN117181024B (en) * | 2023-04-04 | 2024-02-20 | 赛普(杭州)过滤科技有限公司 | Ultrafiltration membrane with pH response switchable pore diameter and preparation method thereof |
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