CN117815912B - Anti-pollution long-life ultrafiltration membrane material and preparation method thereof - Google Patents
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Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to the technical field of ultrafiltration membranes, and in particular provides an anti-pollution long-life ultrafiltration membrane material and a preparation method thereof, wherein the synthetic raw materials of the ultrafiltration membrane material comprise the following components in parts by weight: 1-5 parts of silicon-based ZnO quantum dots@ferrous MOFs, 100-200 parts of organic solvents, 2-6 parts of vinyl silane coupling agents, 0.5-1 part of pore-forming agents and 30-50 parts of vinylidene fluoride. ZnO quantum dots and ferrous MOFs are combined and added into the ultrafiltration membrane material, and the photocatalytic performance of the ZnO quantum dots is combined with the Fenton catalytic capability of the ferrous MOFs, so that the anti-pollution capability of the ultrafiltration membrane is remarkably improved, the structural damage of the ultrafiltration membrane is reduced, and the service life of the ultrafiltration membrane is prolonged.
Description
Technical Field
The invention relates to the technical field of ultrafiltration membranes, in particular to an anti-pollution long-life ultrafiltration membrane material and a preparation method thereof.
Background
In the technical field of water treatment and separation, an ultrafiltration membrane is one of widely adopted technologies because of high-efficiency interception capability and relatively low operation cost, and can effectively remove suspended particles, bacteria, viruses and certain macromolecular organic matters in water, and is applied to multiple fields of drinking water treatment, wastewater treatment, food processing, medicine manufacturing and the like.
However, despite the numerous advantages of ultrafiltration membrane technology, some key problems are faced during practical use, particularly membrane fouling and lifetime limitation. Membrane fouling is one of the main problems affecting the performance of ultrafiltration membranes. With the increase of the service time, pollutants such as organic matters, microorganisms, inorganic salts and the like in the water can accumulate on the surface of the membrane to form a pollution layer, so that the flux of the membrane is reduced, and the interception efficiency is reduced. The device not only needs frequent shutdown and cleaning and increases the operation cost, but also can cause the damage of the membrane material structure and shorten the service life of the membrane; in addition, some contaminants, such as biological macromolecules and microorganisms, may penetrate the membrane pores into the filtration side, affecting the quality of the produced water.
Disclosure of Invention
Aiming at the situation, in order to overcome the defects of the prior art, the invention provides the anti-pollution long-life ultrafiltration membrane material and the preparation method thereof, znO quantum dots are combined with ferrous MOFs, and added into the ultrafiltration membrane material, the photocatalytic property of the ZnO quantum dots is combined with the porous Fenton catalytic property of the ferrous MOFs, so that the degradation of pollutants on the surface of the ultrafiltration membrane is effectively improved, the damage of the membrane material structure is avoided, and the service life of the ultrafiltration membrane is prolonged.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the invention provides an anti-pollution long-life ultrafiltration membrane material, which comprises the following synthetic raw materials in parts by weight: 1-5 parts of silicon-based ZnO quantum dots@ferrous MOFs, 100-200 parts of organic solvents, 2-6 parts of vinyl silane coupling agents, 0.5-1 part of pore-forming agents and 30-50 parts of vinylidene fluoride.
Preferably, the preparation method of the silicon-based ZnO quantum dot @ ferrous MOFs comprises the following steps:
① Weighing 5-10 mmoL of zinc acetate, dissolving in 100mL ethanol, stirring at 460-560 rpm at room temperature to fully dissolve, dropwise adding 10mL of 0.2 mol/L of potassium hydroxide ethanol solution, continuously stirring for 6-8 h, placing into a centrifuge, removing supernatant at 8000 rpm, placing the precipitate into a vacuum drying oven, and drying at 60 ℃ for 12h to obtain ZnO quantum dots;
② Weighing 4mmoL ferrous salt, 2 mmoL organic ligand, 100 mL DMF, 6 mL methanol, 8 mL water and 1-2 mL tetraethyl silicate, placing the materials into a 200 mL beaker, stirring at 400-500 rpm for 1 h, adding 200-300 mg ZnO quantum dots prepared in the step ①, continuing stirring for 1 h, transferring to a reaction kettle with polytetrafluoroethylene lining, placing into a baking oven, heating at 115 ℃ for 24h, placing into a centrifugal machine for 8000 rpm after the reaction is finished, removing supernatant, washing and precipitating for three times alternately by using ethanol and distilled water, and placing into a vacuum drying oven for drying at 60 ℃ for 12 h to obtain silicon-based ZnO quantum dots@ferrous MOFs.
Preferably, in the step ②, the ferrous salt is any one of ferrous chloride, ferrous sulfate and ferrous nitrate.
Preferably, the organic ligand in the step ② is any one of terephthalic acid, 2-amino terephthalic acid, trimesic acid and pyromellitic acid.
Preferably, the organic solvent is any one of DMF, DMSO, N-methylpyrrolidone.
Preferably, the vinyl silane coupling agent is any one of vinyl trimethoxy silane and vinyl triethoxy silane.
Preferably, the pore-forming agent is any one of polyvinyl alcohol, polyvinylpyrrolidone, sodium dodecyl sulfate and cetyltrimethylammonium bromide.
The invention also provides a preparation method of the anti-pollution long-life ultrafiltration membrane material, which specifically comprises the following steps:
s1, adding silicon-based ZnO quantum dots @ ferrous MOFs, a vinyl silane coupling agent, a pore-forming agent and vinylidene fluoride into an organic solvent according to parts by weight, stirring for 24h at 450-600 rpm at normal temperature, and standing for 12h for defoaming treatment at 60 ℃ to obtain a casting film liquid;
S2, scraping the casting solution prepared in the step S1 into a flat membrane by a flat membrane scraper, and soaking the flat membrane in water for 24h to obtain the anti-pollution long-service-life ultrafiltration membrane material.
Compared with the prior art, the invention has the following beneficial effects:
The ultrafiltration membrane prepared by combining ZnO quantum dots and ferrous MOFs has remarkable beneficial effects in improving the anti-pollution performance and prolonging the service life. The photocatalytic property of the ZnO quantum dot is combined with Fenton catalytic property, high specific surface area and adjustable porosity of ferrous MOFs, so that the water treatment efficiency is effectively improved, and meanwhile, the decomposition efficiency of organic pollutants is enhanced; the ferrous MOFs and the ZnO quantum dots are combined to form a good synergistic effect, so that the removal capability of the ultrafiltration membrane to organic pollutants is further enhanced, particularly under the illumination condition, electrons generated by the ZnO quantum dots are utilized to excite ferrous ions, and hydroxyl free radicals are accelerated to be generated, so that the decomposition efficiency of the organic pollutants is enhanced, the self-cleaning capability of the membrane is enhanced, the risk of forming biological membranes is reduced, and the anti-pollution capability of the membrane is remarkably improved. In addition, the preparation method of the ultrafiltration membrane material is simple and convenient to operate, is convenient for large-scale production, and provides a novel efficient and environment-friendly solution for the fields of industrial water treatment, food and beverage manufacturing, biological medicine separation and the like.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only of the invention and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
FIG. 1 is a scanning electron microscope and transmission electron microscope image of silicon-based ZnO quantum dots @ ferrous-based MOFs prepared in example 1;
FIG. 2 is a scanning electron microscope image of the surface and cross section of the ultrafiltration membrane material prepared in example 1;
FIG. 3 is an XRD pattern of silicon-based ZnO quantum dots @ ferrous-based MOFs prepared in example 1;
Fig. 4 is an XPS spectrum of iron element in the silicon-based ZnO quantum dots @ ferrous-based MOFs prepared in example 1.
Detailed Description
The present invention will be further described in detail with reference to the following specific examples, but the present invention is not limited to the following examples, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent.
Unless otherwise specified, the chemical reagents involved in the present invention are all commercially available.
Example 1: the embodiment provides an anti-pollution long-life ultrafiltration membrane material, which comprises the following synthetic raw materials in parts by weight: silicon-based ZnO quantum dots @ ferrous MOFs 5 parts, DMF 100 parts, vinyl trimethoxy silane 6 parts, polyvinyl alcohol 0.5 parts and vinylidene fluoride 50 parts.
The preparation method of the silicon-based ZnO quantum dot @ ferrous MOFs comprises the following steps:
① Weighing 5 mmoL zinc acetate, dissolving in 100 mL ethanol, stirring at room temperature for fully dissolving 460 rpm, dropwise adding 10 mL of 0.2 mol/L potassium hydroxide ethanol solution, continuously stirring for 6 h, placing into a centrifuge, 8000 rpm removing supernatant, placing precipitate into a vacuum drying oven, and drying at 60deg.C for 12h to obtain ZnO quantum dot;
② Weighing 4 mmoL ferrous chloride, 2mmoL terephthalic acid, 100mL DMF, 6 mL methanol, 8 mL water and 1 mL tetraethyl silicate, putting the materials into a 200 mL beaker, stirring 1h by 400 rpm, adding the ZnO quantum dots prepared in step ① of 200 mg, continuously stirring 1h, transferring the materials into a reaction kettle with polytetrafluoroethylene lining, heating 24 h in the condition of 115 ℃, putting the reaction kettle into a centrifuge 8000 rpm to remove supernatant after the reaction is finished, washing and precipitating three times alternately by using ethanol and distilled water, and putting the materials into a vacuum drying oven to dry 12 h at 60 ℃ to obtain the silicon-based ZnO quantum dots@ferrous MOFs.
The embodiment also provides a preparation method of the anti-pollution long-life ultrafiltration membrane material, which specifically comprises the following steps:
S1, adding silicon-based ZnO quantum dots @ ferrous MOFs, vinyl trimethoxy silane, polyvinyl alcohol and vinylidene fluoride into DMF (dimethyl formamide) according to parts by weight, stirring for 24h at normal temperature by 450 rpm, and standing for 12 h for defoaming at 60 ℃ to obtain a casting solution;
S2, scraping the casting solution prepared in the step S1 into a flat membrane by a flat membrane scraper, and soaking the flat membrane in water for 24h to obtain the anti-pollution long-service-life ultrafiltration membrane material.
Example 2: the embodiment provides an anti-pollution long-life ultrafiltration membrane material, which comprises the following synthetic raw materials in parts by weight: 1 part of silicon-based ZnO quantum dots @ ferrous MOFs, 200 parts of DMSO, 2 parts of vinyl triethoxysilane, 1 part of polyvinylpyrrolidone and 30 parts of vinylidene fluoride.
The preparation method of the silicon-based ZnO quantum dot @ ferrous MOFs comprises the following steps:
① Weighing 10 mmoL of zinc acetate, dissolving in 100 mL of ethanol, stirring at room temperature under 560 and rpm to make the zinc acetate fully dissolved, dropwise adding 10 mL of 0.2 mol/L of potassium hydroxide ethanol solution, continuously stirring for 8h, placing into a centrifuge, 8000 rpm removing supernatant, placing the precipitate into a vacuum drying oven, and drying at 60 ℃ for 12 h to obtain ZnO quantum dots;
② Weighing 4 mmoL ferrous sulfate, 2-amino terephthalic acid of 2mmoL, 100mL DMF, 6 mL methanol, 8 mL water and 2 mL tetraethyl silicate, placing into a 200 mL beaker, stirring 1h with 500 rpm, adding 300 mg ZnO quantum dots prepared in step ①, continuing stirring 1h, transferring into a reaction kettle with polytetrafluoroethylene lining, placing into an oven, heating 24h at 115 ℃, placing into a centrifuge 8000 rpm after the reaction is finished to remove supernatant, washing and precipitating three times with ethanol and distilled water alternately, and placing into a vacuum drying oven, drying 12 h at 60 ℃ to obtain silicon-based ZnO quantum dots @ ferrous MOFs.
The embodiment also provides a preparation method of the anti-pollution long-life ultrafiltration membrane material, which specifically comprises the following steps:
s1, adding silicon-based ZnO quantum dots @ ferrous MOFs, vinyl triethoxysilane, polyvinylpyrrolidone and vinylidene fluoride into DMSO according to parts by weight, stirring the mixture for 24h at normal temperature 600 rpm, and standing the mixture at 60 ℃ for 12 h for defoaming treatment to obtain a casting solution;
S2, scraping the casting solution prepared in the step S1 into a flat membrane by a flat membrane scraper, and soaking the flat membrane in water for 24h to obtain the anti-pollution long-service-life ultrafiltration membrane material.
Example 3: the embodiment provides an anti-pollution long-life ultrafiltration membrane material, which comprises the following synthetic raw materials in parts by weight: 3 parts of silicon-based ZnO quantum dots @ ferrous MOFs, 150 parts of N-methylpyrrolidone, 4 parts of vinyl trimethoxy silane, 0.7 part of cetyl trimethyl ammonium bromide and 40 parts of vinylidene fluoride.
The preparation method of the silicon-based ZnO quantum dot @ ferrous MOFs comprises the following steps:
① Weighing 7 mmoL zinc acetate, dissolving in 100mL ethanol, stirring at room temperature for fully dissolving 500 rpm, dropwise adding 10mL of 0.2 mol/L potassium hydroxide ethanol solution, continuously stirring 7 h, placing into a centrifuge, 8000 rpm removing supernatant, placing the precipitate into a vacuum drying oven, and drying at 60deg.C for 12h to obtain ZnO quantum dot;
② Weighing 4 mmoL ferrous nitrate, 2 mmoL trimesic acid, 100 mL DMF, 6 mL methanol, 8mL water and 1.5 mL tetraethyl silicate, placing the materials in a 200 mL beaker, 450 rpm stirring 1h, adding 250 mg ZnO quantum dots prepared in step ①, continuing stirring 1h, transferring to a reaction kettle with polytetrafluoroethylene lining, placing in a baking oven, heating 24 h at 115 ℃, placing in a centrifuge 8000 rpm to remove supernatant after the reaction is finished, washing and precipitating three times alternately by using ethanol and distilled water, placing in a vacuum drying oven, and drying 12 h at 60 ℃ to obtain silicon-based ZnO quantum dots @ ferrous MOFs.
The embodiment also provides a preparation method of the anti-pollution long-life ultrafiltration membrane material, which specifically comprises the following steps:
s1, adding silicon-based ZnO quantum dots @ ferrous MOFs, vinyl trimethoxy silane, hexadecyl trimethyl ammonium bromide and vinylidene fluoride into N-methyl pyrrolidone according to parts by weight, stirring the mixture at the normal temperature of 500 rpm for 24: 24 h, and standing the mixture at the temperature of 60 ℃ for 12: 12 h for defoaming treatment to obtain a casting solution;
S2, scraping the casting solution prepared in the step S1 into a flat membrane by a flat membrane scraper, and soaking the flat membrane in water for 24h to obtain the anti-pollution long-service-life ultrafiltration membrane material.
Comparative example 1: this comparative example proposes an anti-pollution long-life ultrafiltration membrane material which differs from example 1 only in that no silicon-based ZnO quantum dots @ ferrous-based MOFs are added, and the remaining components, component contents, experimental steps are the same as in example 1.
Comparative example 2: this comparative example proposes an anti-pollution long-life ultrafiltration membrane material which differs from example 1 only in that no ZnO quantum dots are added, and the remaining components, component contents, experimental steps are the same as in example 1.
Comparative example 3: the comparative example proposes an anti-pollution long-life ultrafiltration membrane material, which is different from example 1 only in that only silicon-based ZnO quantum dots are added, and the rest components, component contents and experimental steps are the same as those of example 1.
Experimental example 1: observing the morphology of the silicon-based ZnO quantum dot @ ferrous-based MOFs prepared in the example 1 by using a scanning electron microscope and a transmission electron microscope, and observing the morphology of the surface and the cross section of the ultrafiltration membrane material prepared in the example 1 by using the scanning electron microscope; analyzing the structural characteristics of the silicon-based ZnO quantum dots @ ferrous MOFs by using an X-ray diffractometer; further analyzing the valence state of the iron element in the silicon-based ZnO quantum dots @ ferrous-based MOFs by using an X-ray photoelectron spectroscopy (XPS).
FIG. 1 is a scanning electron microscope and a transmission electron microscope of silicon-based ZnO quantum dots @ ferrous-based MOFs prepared in example 1, and as shown in the drawing, the particle size of the silicon-based ZnO quantum dots @ ferrous-based MOFs is uneven and relatively large, and the silicon-based ZnO quantum dots @ ferrous-based MOFs are prepared successfully by adding a silane coupling agent to aggregate MOFs and quantum dots, so that the stability of a composite material is improved. FIG. 2 is a scanning electron microscope image of the surface and cross section of the ultrafiltration membrane material prepared in example 1, and as shown in the figure, a large number of silicon-based ZnO quantum dots@ferrous MOFs are distributed in the membrane material and cross section, so that the membrane material fully plays a role in improving the anti-pollution performance of the ultrafiltration membrane.
FIG. 3 is an XRD pattern of the silicon-based ZnO quantum dots @ ferrous MOFs prepared in example 1, as shown in the figure, the silicon-based ZnO quantum dots @ ferrous MOFs contain characteristic peaks of ZnO quantum dots and ferrous MOFs, and the shift and change of the characteristic peaks of the iron-based MOFs are caused by aggregation of the ferrous MOFs due to hydrolytic polymerization of the silane coupling agent. XRD patterns indicate successful synthesis of silicon-based ZnO quantum dots @ ferrous MOFs.
FIG. 4 is an XPS spectrum of the iron element in the silicon-based ZnO quantum dots @ ferrous-based MOFs prepared in example 1, wherein the Fe 2p spectrum can be subdivided into a plurality of spectra including Fe (II) and Fe (III), indicating that Fe (II) and Fe (III) are co-present in the silicon-based ZnO quantum dots @ ferrous-based MOFs, as shown in the figure; and wherein the fractional area of Fe (II) is larger than that of Fe (III), i.e. the content of Fe (II) is larger than that of Fe (III), and Fe (II) plays a main role in the ultrafiltration membrane material, and the existence of Fe (III) is due to the unavoidable oxidation of Fe (II) into Fe (III) in the synthesis process of the ferrous-based MOFs, which indicates successful synthesis of the ferrous-based MOFs.
Experimental example 2: pure water flux test:
the ultrafiltration membrane materials prepared in examples 1 to 3 and comparative examples 1 to 3 were immersed in distilled water again at 12h, sheared into round membranes with a diameter of 80: 80 mm, placed in a JPC-300 ultrafiltration cup, 300: 300 mL distilled water was poured into the ultrafiltration cup, and after the pressure was reduced to 0.1: 0.1 MPa to a pre-pressure of 40: 40 min until the water flux was stable, the water flux was measured at a pressure of 0.1: 0.1 MPa, and the test data are shown in table 1.
Experimental example 3: test of the rejection rate of bovine serum albumin:
The ultrafiltration membrane materials prepared in examples 1 to 3 and comparative examples 1 to 3 were placed in an ultrafiltration cup under a pressure of 0.1 MPa using 1.0 g/L of Bovine Serum Albumin (BSA) solution as a retentate, and the BSA solution filtrate was collected as a test membrane, and BSA concentrations in the stock solution and filtrate were measured, and the retention rate R= [ stock solution concentration-filtrate concentration ]/stock solution concentration×100%, and the test data are shown in Table 1.
Experimental example 4: anti-contamination test:
Under the pressure of 0.1 MPa, 50 mL of rhodamine B solution with the concentration of 50 mg/L is taken as a trapped substance, the ultrafiltration membrane materials prepared in examples 1-3 and comparative examples 1-3 are respectively taken as test membranes, 10 mmol/L hydrogen peroxide solution is replaced after filtration is completed, 50 mL hydrogen peroxide solution is filtered under the illumination condition, the pure water flux of the ultrafiltration membrane is retested, the anti-pollution performance of the ultrafiltration membrane is represented by the pure water flux recovery rate, and the test data are shown in table 1.
Table 1 test data
As shown in Table 1, the pure water flux of the ultrafiltration membranes prepared in examples 1-3 and comparative example 2 is greater than that of comparative examples 1 and 3, indicating that the introduction of MOFs material can increase the pure water flux of the ultrafiltration membrane, wherein the pure water flux of the ultrafiltration membrane prepared in example 2 is maximum up to 480L/m 2 h, because the organic ligand for synthesizing MOFs material is 2-amino terephthalic acid, and the amino groups on the ligand increase the hydrophilicity of the material, thereby increasing the pure water flux of the ultrafiltration membrane. Meanwhile, the rejection rate of the bovine serum albumin of the ultrafiltration membranes prepared in examples 1-3 and comparative example 2 is higher than that of comparative examples 1 and 3, which shows that the microporous structure of MOFs material can improve the rejection rate of the bovine serum albumin of the ultrafiltration membranes. The anti-pollution pure water flux recovery rates of the ultrafiltration membrane materials prepared in the examples 1-3 reach 100%, the anti-pollution capacity of the ultrafiltration membrane prepared in the comparative example 3 is slightly larger than that of the ultrafiltration membrane prepared in the comparative example 2, and the anti-pollution capacity of the ultrafiltration membrane is larger than that of the ultrafiltration membrane prepared in the comparative example 1, so that ZnO quantum dots can cooperate with ferrous MOFs to degrade pollutants attached to the ultrafiltration membrane by photo Fenton, and the service life of the ultrafiltration membrane is prolonged.
The invention and its embodiments have been described above without limitation, and the practical application is not limited thereto. In summary, those skilled in the art, having benefit of this disclosure, will appreciate that the invention can be practiced without the specific details disclosed herein.
Claims (7)
1. The anti-pollution long-life ultrafiltration membrane material is characterized by comprising the following synthetic raw materials in parts by weight: 1-5 parts of silicon-based ZnO quantum dots@ferrous MOFs, 100-200 parts of organic solvents, 2-6 parts of vinyl silane coupling agents, 0.5-1 part of pore-forming agents and 30-50 parts of vinylidene fluoride;
The preparation method of the silicon-based ZnO quantum dot @ ferrous MOFs comprises the following steps:
① Weighing 5-10 mmoL of zinc acetate, dissolving in 100mL ethanol, stirring at 460-560 rpm at room temperature to fully dissolve, dropwise adding 10mL of 0.2 mol/L of potassium hydroxide ethanol solution, continuously stirring for 6-8 h, placing into a centrifuge, removing supernatant at 8000 rpm, placing the precipitate into a vacuum drying oven, and drying at 60 ℃ for 12h to obtain ZnO quantum dots;
② Weighing 4mmoL ferrous salt, 2 mmoL organic ligand, 100 mL DMF, 6 mL methanol, 8 mL water and 1-2 mL tetraethyl silicate, placing the materials into a 200 mL beaker, stirring at 400-500 rpm for 1 h, adding 200-300 mg ZnO quantum dots prepared in the step ①, continuing stirring for 1 h, transferring to a reaction kettle with polytetrafluoroethylene lining, placing into a baking oven, heating at 115 ℃ for 24h, placing into a centrifugal machine for 8000 rpm after the reaction is finished, removing supernatant, washing and precipitating for three times alternately by using ethanol and distilled water, and placing into a vacuum drying oven for drying at 60 ℃ for 12 h to obtain silicon-based ZnO quantum dots@ferrous MOFs.
2. The anti-pollution long-life ultrafiltration membrane material according to claim 1, wherein the ferrous salt in the step ② is any one of ferrous chloride, ferrous sulfate and ferrous nitrate.
3. The anti-pollution long-life ultrafiltration membrane material according to claim 2, wherein the organic ligand in the step ② is any one of terephthalic acid, 2-amino terephthalic acid, trimesic acid and pyromellitic acid.
4. An anti-fouling long life ultra-filtration membrane material according to claim 3, wherein said organic solvent is any one of DMF, DMSO, N-methyl pyrrolidone.
5. The anti-pollution long-life ultrafiltration membrane material of claim 4, wherein said vinyl silane coupling agent is any one of vinyl trimethoxy silane and vinyl triethoxy silane.
6. The anti-pollution long-life ultrafiltration membrane material according to claim 5, wherein said pore-forming agent is any one of polyvinyl alcohol, polyvinylpyrrolidone, sodium dodecyl sulfate, and cetyltrimethylammonium bromide.
7. A method for preparing an anti-pollution long-life ultrafiltration membrane material according to any one of claims 1 to 6, comprising the following steps:
s1, adding silicon-based ZnO quantum dots @ ferrous MOFs, a vinyl silane coupling agent, a pore-forming agent and vinylidene fluoride into an organic solvent according to parts by weight, stirring for 24h at 450-600 rpm at normal temperature, and standing for 12h for defoaming treatment at 60 ℃ to obtain a casting film liquid;
S2, scraping the casting solution prepared in the step S1 into a flat membrane by a flat membrane scraper, and soaking the flat membrane in water for 24h to obtain the anti-pollution long-service-life ultrafiltration membrane material.
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