CN114053880A - Polyether sulfone ultrafiltration membrane using tea polyphenol and polyvinyl alcohol as additives and preparation method thereof - Google Patents
Polyether sulfone ultrafiltration membrane using tea polyphenol and polyvinyl alcohol as additives and preparation method thereof Download PDFInfo
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- 239000012528 membrane Substances 0.000 title claims abstract description 105
- 239000004695 Polyether sulfone Substances 0.000 title claims abstract description 92
- 229920006393 polyether sulfone Polymers 0.000 title claims abstract description 92
- 238000000108 ultra-filtration Methods 0.000 title claims abstract description 56
- 150000008442 polyphenolic compounds Chemical class 0.000 title claims abstract description 42
- 235000013824 polyphenols Nutrition 0.000 title claims abstract description 42
- 239000004372 Polyvinyl alcohol Substances 0.000 title claims abstract description 40
- 229920002451 polyvinyl alcohol Polymers 0.000 title claims abstract description 40
- 239000000654 additive Substances 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 241001122767 Theaceae Species 0.000 title claims description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 238000005266 casting Methods 0.000 claims abstract description 21
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims abstract description 20
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims abstract description 20
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims abstract description 20
- 239000008367 deionised water Substances 0.000 claims abstract description 17
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 17
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000003756 stirring Methods 0.000 claims abstract description 10
- 238000001132 ultrasonic dispersion Methods 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 3
- 239000011521 glass Substances 0.000 claims description 21
- 229920002554 vinyl polymer Polymers 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
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- 239000002904 solvent Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 230000004907 flux Effects 0.000 abstract description 43
- 230000014759 maintenance of location Effects 0.000 abstract description 16
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- 230000007246 mechanism Effects 0.000 abstract description 2
- 238000012986 modification Methods 0.000 abstract description 2
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- 239000002346 layers by function Substances 0.000 abstract 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- 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
- B01D71/66—Polymers having sulfur in the main chain, with or without nitrogen, oxygen or carbon only
- B01D71/68—Polysulfones; Polyethersulfones
-
- 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
-
- 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
-
- 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
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2323/00—Details relating to membrane preparation
- B01D2323/12—Specific ratios of components used
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/36—Hydrophilic membranes
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- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
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Abstract
The invention discloses a polyether sulfone ultrafiltration membrane using pure natural green tea extract tea polyphenol and polyvinyl alcohol as additives and a preparation method thereof, wherein the preparation method comprises the following steps: forming a hydrophilic functional layer on the surface of hydrophobic polyethersulfone by utilizing the hydrogen bonding action of tea polyphenol and polyvinyl alcohol to perform hydrophilic modification on a polyethersulfone ultrafiltration membrane, drying the polyethersulfone and polyvinylpyrrolidone, dissolving the polyethersulfone and the polyvinylpyrrolidone in dimethyl sulfoxide, adding the tea polyphenol and the polyvinyl alcohol, uniformly dispersing in an ultrasonic dispersion instrument, heating to 90 ℃, fully stirring and dissolving to prepare a casting membrane solution a; and standing and defoaming the prepared membrane casting solution a, pouring the membrane casting solution to scrape a membrane, standing in the air, then placing the membrane casting solution into a deionized water coagulating bath to form a membrane, and soaking the membrane in deionized water to obtain the tea polyphenol and polyvinyl alcohol modified polyether sulfone ultrafiltration membrane. The invention adopts a phase inversion method to prepare the membrane, uses static pressure difference as a driving force, and uses a pore size sieving theory as a filtering mechanism, so that pollutants in water are intercepted by a tea polyphenol-polyethersulfone ultrafiltration membrane, thereby achieving the purpose of primary water purification; the hydrophilicity of the polyether sulfone is increased, the permeation flux of the membrane is increased, and the retention rate is improved.
Description
Technical Field
The invention relates to the technical field of ultrafiltration membrane preparation, in particular to a polyether sulfone ultrafiltration membrane taking tea polyphenol and polyvinyl alcohol as additives and a preparation method thereof.
Background
Ultrafiltration membranes are important in the purification, concentration, filtration and separation of solutes in the pharmaceutical, dairy, biotechnological industries and in waste water treatment. The ultrafiltration membrane is a pressure-driven membrane with static pressure difference as driving force, the ultrafiltration technology has a wider interception interval (500-. Currently, the materials widely used as the film matrix include polyamides, polyolefins, polyaryl ethers, polyaryl heterocycles and other organic polymer materials, and the polyether sulfone is a thermoplastic polymer material with excellent comprehensive performance and has excellent heat resistance, mechanical properties, insulating properties and the like.
However, polyethersulfone, as a substrate material of ultrafiltration membranes, often results in low permeation flux during application, poor rejection and anti-fouling capability of the membrane due to its hydrophobicity, and this trade-off relationship between permeation flux and rejection (trade-off effect). The hydrophilic membrane surface is beneficial to the penetration of water molecules, and a hydration layer can be formed to enhance the anti-fouling performance of the membrane. Thus, increasing the hydrophilic capacity of the membrane is an important way to improve the membrane flux, the anti-fouling capacity and the wide application of ultrafiltration technology.
Disclosure of Invention
The invention aims to improve the hydrophilic capability of a polyether sulfone membrane, and provides a polyether sulfone ultrafiltration membrane using tea polyphenol and polyvinyl alcohol as additives and a preparation method thereof.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
a polyethersulfone ultrafiltration membrane using tea polyphenol and polyvinyl alcohol as additives takes dimethyl sulfoxide as a solvent, and comprises the following components in percentage by mass: 15-18% of polyether sulfone, 1-3% of polyvinylpyrrolidone, 0.08-0.32% of tea polyphenol and 0.4% of polyvinyl alcohol.
Furthermore, in the polyethersulfone ultrafiltration membrane using the tea polyphenol and the polyvinyl alcohol as additives, the mass concentration of the polyethersulfone is 15%.
Furthermore, in the polyethersulfone ultrafiltration membrane using the tea polyphenol and the polyvinyl alcohol as additives, the mass concentration of the polyvinylpyrrolidone is 2%.
Furthermore, in the polyethersulfone ultrafiltration membrane using the tea polyphenol and the polyvinyl alcohol as additives, the mass concentration of the tea polyphenol is 0.1-0.3%.
Furthermore, in the polyethersulfone ultrafiltration membrane using the tea polyphenol and the polyvinyl alcohol as additives, the mass concentration of the polyvinyl alcohol is 0.4%.
Further, in the polyethersulfone ultrafiltration membrane using the tea polyphenol and the polyvinyl alcohol as additives, the preparation method comprises the following steps:
(1) drying polyether sulfone and polyvinylpyrrolidone at the temperature of 100-120 ℃ for 10-14 hours, dissolving the polyether sulfone and polyvinylpyrrolidone in dimethyl sulfoxide at normal temperature, and magnetically stirring to uniformly dissolve the polyether sulfone and polyvinylpyrrolidone;
(2) adding tea polyphenol and polyvinyl alcohol, performing ultrasonic dispersion for 25-35 minutes, stirring for 10-14 hours at 90 ℃ in air, and defoaming for 2-3 hours to obtain a casting solution a;
(3) pouring the casting solution a onto a glass plate, scraping the film at room temperature, standing in the air for 25-35 seconds, slowly immersing the glass plate coated with the casting solution a into deionized water at room temperature for gel curing to form a film, immersing for 2-4 days, and replacing the deionized water every 11.5-12.5 hours to obtain a PES film;
(4) and (3) carefully taking out the obtained PES membrane, and then hanging and airing the PES membrane in a dustless room-temperature environment to obtain the tea polyphenol-polyvinyl alcohol-polyether sulfone ultrafiltration membrane.
Furthermore, in the polyethersulfone ultrafiltration membrane using the tea polyphenol and the polyvinyl alcohol as additives, the density of the polyethersulfone in the step (1) is 1.2-1.3g/m for carrying out the year.
Furthermore, in the polyethersulfone ultrafiltration membrane using the tea polyphenol and the polyvinyl alcohol as additives, the molecular weight of the polyvinylpyrrolidone in the step (1) is 58000.
Further, in the polyethersulfone ultrafiltration membrane using the tea polyphenol and the polyvinyl alcohol as additives, the polyethersulfone and the polyvinylpyrrolidone in the step (1) are dried for 12 hours at the temperature of 110 ℃.
Further, in the polyethersulfone ultrafiltration membrane using the tea polyphenol and the polyvinyl alcohol as additives, a proper amount of tea polyphenol is added in the step (2) for ultrasonic dispersion for 30min, and the mixture is stirred for 12h in the air at 90 ℃ and defoamed for 2-3 h.
Further, in the polyethersulfone ultrafiltration membrane using tea polyphenol and polyvinyl alcohol as additives, the membrane casting solution a in step (3) is poured onto a glass plate, the membrane is scraped at room temperature, the glass plate coated with the membrane casting solution a is slowly immersed into deionized water at room temperature for 30 seconds to be subjected to gel curing to form a membrane, the membrane is immersed for 3 days, and the deionized water is replaced every 12 hours.
The invention has the beneficial effects that:
the invention adopts a phase inversion method to prepare the membrane, has simple preparation, takes tea polyphenol, polyvinyl alcohol and polyvinylpyrrolidone as additives, takes polyether sulfone as membrane matrix, takes static pressure difference as driving force and aperture screening theory as a filtering mechanism, and leads pollutants in water to be intercepted by a tea polyphenol-polyvinyl alcohol-polyether sulfone ultrafiltration membrane, thereby achieving the purpose of primary water purification. According to the ultrafiltration membrane prepared by the invention, by adding the tea polyphenol and the polyvinyl alcohol, a hydrophilic layer is formed on the surface due to the action of hydrogen bonds and mussels, so that the hydrophilicity of the polyether sulfone is increased, the permeation flux of the membrane is increased, and the rejection rate is improved.
Of course, it is not necessary for any one product that embodies the invention to achieve all of the above advantages simultaneously.
Drawings
FIG. 1 is an electron micrograph of a cross section of a film of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
(1) Dissolving 15g of polyethersulfone and 2g of polyvinylpyrrolidone which are dried for 12 hours at 110 ℃ into dimethyl sulfoxide at normal temperature, and magnetically stirring;
(2) adding 0.1g of tea polyphenol and 0.4g of polyvinyl alcohol into the system, performing ultrasonic dispersion for 30min, stirring for 12h at 90 ℃ in air, dissolving uniformly, and defoaming for 3h to obtain a polyether sulfone casting solution;
(3) pouring the casting solution on a glass plate, coating the glass plate on a clean glass plate by using a glass rod in a room temperature environment with certain relative humidity, standing in the air for 30 seconds, slowly immersing the glass plate of the polyether sulfone casting solution in deionized water at room temperature for gel curing to form a film, immersing for 3 days, and replacing the deionized water every 12 hours to obtain a polyether sulfone film;
(4) and (3) carefully taking out the obtained PES membrane, and then hanging and airing the PES membrane in a dustless room-temperature environment to obtain the tea polyphenol-polyvinyl alcohol-polyether sulfone ultrafiltration membrane.
The pure water flux of the polyether sulfone ultrafiltration membrane prepared in the example is 206L/m2H, (transmembrane pressure 0.1MPa, 28 ℃), Bovine Serum Albumin (BSA) retention of 97.8%.
Membrane retention Performance test
Pure water flux and retention flux, retention rate test:
pure water flux and bovine serum albumin retention rate are tested by using a flux tester, and in the test process, the effective area of the tea polyphenol-polyether sulfone membrane is 0.00077m2The testing pressure is 0.1MPa, the testing temperature is room temperature, and the pure water flux of the filtering membrane is tested to be 1h after the pure water is pre-pressed for 30 min. Pure water flux and retained flux of the filtration membrane were calculated according to the formula J = V/At, where J represents pure water flux (retained flux) (L/m)2H), where t is the permeation time, A is the effective membrane area, and V is the permeate volume.
Dissolving 1g of bovine serum albumin in 1L of deionized water, preparing 1g/L of bovine serum albumin solution, collecting protein penetrating fluid according to the method, testing the absorbance of the penetrating fluid at 280nm by using ultraviolet, and calculating the retention rate of the tea polyphenol-polyether sulfone ultrafiltration membrane according to a tested protein standard curve. Calculating according to the formula: r (%) = (1-C1/C2). times.100%, C1 is the concentration of penetrating fluid, C2 is the concentration of feed liquid. The results of the pure water flux and protein rejection tests are shown in the following table:
| pure water flux (L/square meter h) | Protein rejection (%) | |
| Example 1 | 206 | 97．8% |
Example 2
(1) Dissolving 15g of polyethersulfone and 2g of polyvinylpyrrolidone which are dried for 12 hours at 110 ℃ into dimethyl sulfoxide at normal temperature, and magnetically stirring;
(2) adding 0.2g of tea polyphenol and 0.4g of polyvinyl alcohol into the system, performing ultrasonic dispersion for 30min, stirring for 12h at 90 ℃ in air, dissolving uniformly, and defoaming for 3h to obtain a polyether sulfone casting solution;
(3) pouring the casting solution on a glass plate, coating the glass plate on a clean glass plate by using a glass rod in a room temperature environment with certain relative humidity, standing in the air for 30 seconds, slowly immersing the glass plate of the polyether sulfone casting solution in deionized water at room temperature for gel curing to form a film, immersing for 3 days, and replacing the deionized water every 12 hours to obtain a polyether sulfone film;
(4) and (3) carefully taking out the obtained PES membrane, and then hanging and airing the PES membrane in a dustless room-temperature environment to obtain the tea polyphenol-polyvinyl alcohol-polyether sulfone ultrafiltration membrane.
The pure water flux of the polyether sulfone ultrafiltration membrane prepared by the embodiment is 260L/m2H, (span)The membrane pressure was 0.1MPa, 28 ℃ C., and the Bovine Serum Albumin (BSA) rejection rate was 99.1%.
Membrane retention Performance test
Pure water flux and retention flux, retention rate test:
pure water flux and protein retention rate are tested by using a flux tester, and in the testing process, the effective area of the tea polyphenol-polyether sulfone membrane is 0.00077m2The testing pressure is 0.1MPa, the testing temperature is room temperature, and the pure water flux of the filtering membrane is tested to be 1h after the pure water is pre-pressed for 30 min. Pure water flux and retained flux of the filtration membrane were calculated according to the formula J = V/At, where J represents pure water flux (retained flux) (L/m)2H), where t is the permeation time, A is the effective membrane area, and V is the permeate volume.
Dissolving 1g of bovine serum albumin in 1L of deionized water, preparing 1g/L of bovine serum albumin solution, collecting protein penetrating fluid according to the method, testing the absorbance of the penetrating fluid at 280nm by using ultraviolet, and calculating the retention rate of the tea polyphenol-polyether sulfone ultrafiltration membrane according to a tested protein standard curve. Calculating according to the formula: r (%) = (1-C1/C2). times.100%, C1 is the concentration of penetrating fluid, C2 is the concentration of feed liquid. The results of the pure water flux and protein rejection tests are shown in the following table:
| pure water flux (L/square meter h) | Protein rejection (%) | |
| Example 2 | 260.42 | 99．1% |
Comparative example 1 pure water flux experiment of polyether sulfone-based Membrane modified with polyvinyl alcohol without addition of tea polyphenols
(1) Dissolving 15g of polyethersulfone and 2g of polyvinylpyrrolidone which are dried for 12 hours at 110 ℃ into dimethyl sulfoxide at normal temperature, and uniformly dissolving the polyethersulfone and the polyvinylpyrrolidone by magnetic stirring;
(2) defoaming for 3h to obtain a polyether sulfone casting solution;
(3) pouring the casting solution on a glass plate, coating the glass plate on a clean glass plate by using a glass rod in a room temperature environment with certain relative humidity, standing in the air for 30 seconds, slowly immersing the glass plate of the polyether sulfone casting solution in deionized water at room temperature for gel curing to form a film, immersing for 3 days, and replacing the deionized water every 12 hours to obtain a polyether sulfone film;
(4) and (3) carefully taking out the obtained polyethersulfone membrane, and then hanging and airing the polyethersulfone membrane in a dust-free room temperature environment to obtain the tea polyphenol-polyethersulfone ultrafiltration membrane.
The pure water flux of the polyether sulfone ultrafiltration membrane prepared in the example is 120.32L/m2H, (transmembrane pressure 0.1MPa, 28S ℃), Bovine Serum Albumin (BSA) retention of 95%.
Membrane retention Performance test
Pure water flux and retention flux, retention rate test:
and (3) carrying out pure water flux and protein rejection test by using an experimental flux tester, wherein in the test process, the effective area of the polyether sulfone membrane is 0.00077 square meters, the test pressure is 0.1MPa, the test temperature is room temperature, and the pure water flux of the filter membrane is tested for 1h after pure water is prepressed for 30 min. Pure water flux and retained flux of the filtration membrane were calculated according to the formula J = V/At, where J represents pure water flux (retained flux) (L/m)2H), where t is the permeation time, A is the effective membrane area, and V is the permeate volume.
Dissolving 1g of bovine serum albumin in 1L of deionized water, preparing 1g/L of bovine serum albumin solution, collecting protein penetrating fluid according to the method, testing the absorbance of the penetrating fluid at 280nm by using ultraviolet, and calculating the rejection rate of the polyether sulfone ultrafiltration membrane through a tested protein standard curve. Calculating according to the formula: r (%) = (1-C1/C2). times.100%, C1 is the concentration of penetrating fluid, C2 is the concentration of feed liquid. The results of the pure water flux and protein rejection tests are shown in the following table:
| pure water flux (L/square meter h) | Protein rejection (%) | |
| Comparative example 1 | 120.32 | 95% |
And (4) conclusion: compared with a comparative experiment, the pure water flux of the tea polyphenol-polyethersulfone ultrafiltration membrane modified by tea polyphenol is improved by about 2 times, and the retention rate is increased.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (9)
1. A polyethersulfone ultrafiltration membrane taking tea polyphenol and polyvinyl alcohol as additives is characterized in that dimethyl sulfoxide is used as a solvent, and the mass concentration of the polyethersulfone ultrafiltration membrane comprises the following components: 15-18% of polyether sulfone, 1-3% of polyvinylpyrrolidone, 0.08-0.32% of tea polyphenol and 0.4% of polyvinyl alcohol.
2. The polyethersulfone ultrafiltration membrane using tea polyphenol and polyvinyl alcohol as additives according to claim 1, wherein the ultrafiltration membrane comprises: the mass concentration of the polyether sulfone is 15%.
3. The polyethersulfone ultrafiltration membrane using tea polyphenol and polyvinyl alcohol as additives according to claim 1, wherein the ultrafiltration membrane comprises: the mass concentration of the polyvinylpyrrolidone is 2%.
4. The polyethersulfone ultrafiltration membrane using tea polyphenol and polyvinyl alcohol as additives according to claim 1, wherein the ultrafiltration membrane comprises: the mass concentration of the tea polyphenol is 0.1-0.3%.
5. The polyethersulfone ultrafiltration membrane using tea polyphenol and polyvinyl alcohol as additives according to claim 1, wherein the ultrafiltration membrane comprises: the mass concentration of the polyvinyl alcohol is 0.4%.
6. The polyethersulfone ultrafiltration membrane using tea polyphenol and polyvinyl alcohol as additives as claimed in claim 1, wherein the preparation method comprises the following steps:
(1) drying polyether sulfone and polyvinylpyrrolidone at the temperature of 100-120 ℃ for 10-14 hours, dissolving the polyether sulfone and polyvinylpyrrolidone in dimethyl sulfoxide at normal temperature, and magnetically stirring to uniformly dissolve the polyether sulfone and polyvinylpyrrolidone;
(2) adding tea polyphenol and polyvinyl alcohol, performing ultrasonic dispersion for 25-35 minutes, stirring for 10-14 hours at 90 ℃, and defoaming for 2-3 hours to obtain a casting solution a;
(3) pouring the casting solution a onto a glass plate, scraping the film at room temperature, standing in the air for 25-35 seconds, slowly immersing the glass plate coated with the casting solution a into deionized water at room temperature for gel curing to form a film, immersing for 2-4 days, and replacing the deionized water every 11.5-12.5 hours to obtain a PES film;
(4) and (3) carefully taking out the obtained PES membrane, and then hanging and airing the PES membrane in a dustless room-temperature environment to obtain the tea polyphenol-polyvinyl alcohol-polyether sulfone ultrafiltration membrane.
7. The polyethersulfone ultrafiltration membrane using tea polyphenol and polyvinyl alcohol as additives according to claim 5, wherein the ultrafiltration membrane comprises: and (3) carrying out the high-density multi-stage dry high-speed wet high-speed dry high-speed wet high-speed production in step (1).
8. The polyethersulfone ultrafiltration membrane using tea polyphenol and polyvinyl alcohol as additives according to claim 5, wherein the ultrafiltration membrane comprises: the molecular weight of polyvinylpyrrolidone in step (1) is 58000.
9. The polyethersulfone ultrafiltration membrane using tea polyphenol and polyvinyl alcohol as additives according to claim 5, wherein the ultrafiltration membrane comprises: adding a proper amount of tea polyphenol and polyvinyl alcohol into the mixture obtained in the step (2), performing ultrasonic dispersion for 30min, stirring the mixture in air at 90 ℃ for 12h, and defoaming the mixture for 2-3 h.
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