64 results about "Modified ultrafiltration" patented technology

The invention belongs to the technical field of modified ultrafiltration films, and discloses a visible-light-response antibacterial and antifouling polyvinylidene fluoride film and a preparation method thereof. The preparation method comprises the following steps: firstly depositing Ag3PO4 nanometer particles on the surface of TiO2 by using a in-situ deposition method to obtain an Ag3PO4/TiO2 compound; then dissolving polyvinylidene fluoride powder, a pore-foaming agent and the Ag3PO4/TiO2 compound in an organic solvent, mixing to enable the polyvinylidene fluoride powder, the pore-foaming agent and the Ag3PO4/TiO2 compound to be uniformly dispersed, and then performing decompressing defoaming to obtain a casting film solution; and finally, scraping the film by using a scraper, tape-casting the casting film solution on a clean glass plate, and immersing in a coagulating bath after standing in air to obtain the visible-light-response antibacterial and antifouling polyvinylidene fluoride film. The visible-light-response antibacterial and antifouling polyvinylidene fluoride film has double performances of hydrophilcity and bacterium and fouling resistance, and can be used for lightening the situation that the surface of the polyvinylidene fluoride is polluted when water is treated, and effectively inhibiting the growth and the reproduction of bacteria and microorganisms on the surface of the film.

The invention relates to a method for preparing an ultrafiltration membrane with permanent hydrophilic and antimicrobial properties, which comprises the following steps: preparing a modifying solution from a photosensitizer as well as acrylamide, acrylic acid and other hydrophilic monomers with derivative structures of the capsaicin, spreading the modifying solution on the surface of a pretreated ultrafiltration membrane, introducing nitrogen to remove oxygen, turning on an ultraviolet lamp to carry out reaction for a certain time, and fully cleaning the surface of the pretreated ultrafiltration membrane by deionized water and absolute ethyl alcohol after the reaction finishes so as to remove the unreacted monomers and obtain the modified ultrafiltration membrane. The pure water flux of the flat membrane prepared by adopting the method is more than or equal to 120L/m<2>.hr.0.1Mpa, and the flat membrane can retain 90% of bovine serum albumin (67,000MW) or more and resist more than 92% of colon bacillus and more than 85% of staphylococcus aureus. The hydrophilic and antimicrobial properties of the ultrafiltration membrane are improved greatly due to surface grafting modification, and the ultrafiltration membrane can be used for the high molecular material with carbon-hydrogen bonds or carbon-carbon double bonds on a polymer chain to carry out light grafting modification.

The invention discloses a process for preparing a segmented copolymer PEO-b-PMMA modified ultrafiltration membrane. The process comprises the following steps: preparing 1-3 mass percent of segmented copolymer, 20 mass percent of PVDF, 1.5 mass percent of a pore-foaming agent, 75.5-77.5 mass percent of a solvent into a membrane forming solution, heating and mixing the membrane forming solution for 7 hours, then statically defoaming for one night, making membranes, immersing in distilled water and cutting according to required sizes. According to the process, the segmented copolymer PEO-b-PMMA is added on the surface of the PVDF ultrafiltration membrane, so that the hydrophilicity of the PVDF ultrafiltration membrane is effectively improved, the anti-pollution performance of the membrane is enhanced, and the technical problems of fast flux decline and short service life of the conventional ultrafiltration membrane are solved.

The invention relates to polyacrylonitrile hydrolyzed modified ultrafiltration membrane resisting protein pollution and preparation method thereof. The polyacrylonitrile hydrolyzed modified ultrafiltration membrane is prepared by hydrolyzing and modifying a polyacrylonitrile based membrane made of by taking polyacrylonitrile and N,N-dimethylformamide as raw materials, wherein the mass ratio of the polyacrylonitrile to the N,N-dimethylformamide is 16:84. The preparation method comprises the steps of: dissolving the polyacrylonitrile in the N,N-dimethylformamide at a temperature of 60 DEG C to prepare a casting membrane solution, defoaming, pouring the casing membrane solution on glass, knifing, placing, putting into a water bath to be solidified into a membrane, soaking with water to obtain a polyacrylonitrile ultrafiltration based membrane, soaking into aqueous alkali with 60 DEG C for 1h, washing to be neutral, soaking a polyacrylonitrile hydrolyzed membrane into an aminoethanol water solution with 60 DEG C again, and taking out the membrane and washing to obtain the polyacrylonitrile hydrolyzed modified ultrafiltration membrane. The invention has simple modification process and more generated active group quantity; and the ultrafiltration membrane prepared by the method has great pollution-resisting capacity for protein molecules.

The invention discloses a method for deep treatment of antibiotics in drinking water based on a multiwalled carbon nanotube modified ultrafiltration membrane. The method comprises the following steps: step 1, performing water primary treatment to obtain pretreated water; step 2, filtering the pretreated water with a multiwalled carbon nanotube modified ultrafiltration membrane; and step 3, removing antibiotics with a reverse osmosis process, so as to obtain drinking water meeting standard. The preparation method of the multiwalled carbon nanotube modified ultrafiltration membrane comprises the following steps: firstly preparing a functionalized multiwalled carbon nanotube, then dissolving a membrane base material solvent, adding a surfactant, a pore-foaming agent and multiwalled carbon nanotubes, preparing an ultrafiltration membrane with an electrospinning technique, and adding a polyamide blocked layer and an antifouling layer. The high-flux ultrafiltration membrane prepared according to the invention can easily remove antibiotics micromolecule substances in water, and by applying the method disclosed by the invention to treat the drinking water, the treatment process is simple, and the treatment effect is good, the cost is low, and the method is suitable for popularization and implementation.

The invention discloses a preparation method of an amphiphilic triblock copolymer modified ultrafiltration membrane with pH-responsive property. The method comprises the following steps: taking methylmethacrylate (MMA) and acrylic acid (AA) as raw materials, and preparing PAA-b-PMMA-b-PAA (PAMA) with a controllable structure by adopting reversible addition-fragmentation chain transfer (RAFT) polymerization. The amphiphilic triblock copolymer modified ultrafiltration membrane is directly prepared by adopting immersion precipitation phase inversion. According to a segregation behavior of the modifier on the membrane surface, the ultrafiltration membrane has a certain hydrophilic property and pollution resistance. The PMMA chain segments in the modifier PAMA adopted in the invention and polyvinylidene fluoride have excellent compatibility, and the membrane is kept stable in the application process. The PAA serving as a hydrophilic segment is enriched on the membrane surface and membranepores, the hydrophilic property of the membrane is improved, and adhesion of pollutants on the membrane surface and membrane pores is avoided. In addition, the ultrafiltration membrane has high anti-pollution capacity and retention rate of proteins and exists effective aperture conversion at the pH value of 3-8, and effective pore size regulation under external environmental stimulation is realized.

The invention discloses a preparation method of a modified ultrafiltration membrane co-coated by utilizing dopamine and functional CNTs (Carbon Nanotubes), belongs to the field of preparation of membrane materials and aims to solve the problems of membrane pollution, low flux and the like existing in ultrafiltration membrane running. The preparation method comprises the following steps: firstly adding an additive and a polymeric membrane material into an organic solvent, heating and uniformly stirring, and carrying out vacuum defoamation, thus obtaining a membrane casting solution; uniformly scraping the membrane casting solution to non-woven cloth, and entering a coagulation bath, thus obtaining an ultrafiltration membrane; carboxylating CNTs, ultrasonically dispersing the CNTs in deionized water, and coating the surface of the ultrafiltration membrane with a dispersion solution by utilizing a vacuum filtration way; then promoting dopamine polymerization by utilizing a Fe<2+>/persulfate oxidation system, and firmly fixing the modified CNTs to the surface of the ultrafiltration membrane, thus realizing preparation of the modified ultrafiltration membrane co-coated by the dopamine and modified CNTs. According to the preparation method disclosed by the invention, the adsorptivity, the hydrophily and the antibacterial performance of the CNTs are well utilized, and the anti-pollution property of the ultrafiltration membrane is greatly increased.

The invention discloses a preparation method for blending modification of an ultrafiltration membrane by using nano cellulose crystal, belonging to the field of preparation of membrane materials. Thepreparation method solves the problems that the nano material is expensive in the process of blending modification of ultrafiltration membrane by the existing nano material, and the material dispersibility is not good, the hydrophilicity is insufficient and the material is inclined to agglomerate in the preparation process. The preparation method firstly ultrasonically disperses the nanocellulosecrystals in an organic solvent, then adds the additive and the polymer film material, heats and stirs uniformly, and performs vacuum defoaming to obtain a casting liquid; the casting liquid is evenlyscraped onto the non-woven fabric, and the modified ultrafiltration membrane is obtained by undergoing a coagulation bath. The preparation method makes good use of the hydrophilicity and mechanical strength of the nanocellulose crystal, greatly improves the anti-pollution performance, the water flux and the mechanical strength of the ultrafiltration membrane, and prolongs the service life of the membrane. Simultaneously, the modified nano materials derive from a wealth of sources, and are cheap and easy to obtain, and have good dispersibility in the solvent, so that the ultrafiltration membrane is relatively low in cost and convenient for industrial production.

The invention discloses a preparation method of a multi-functional amphiphilic low-surface-energy polymer brush, which is applied to antifouling modification of a biofouling separation ultrafiltration membrane. The preparation method of the related low-surface-energy polysiloxane is as follows: a multi-functional amphiphilic low-surface-energy modifier is obtained by performing stirring reaction on the raw materials, comprising polydimethylsiloxane monomethyl ether-methacrylate (PDMSMA), methoxypolyethylene glycol-methacrylate (PEGMA), an initiator and a solvent, by a radical solution polymerization method and then performing treatment. The modifier and a polymer membrane material are dissolved into a dimethyl formamide (DMF) solvent according to a certain mass ratio and then a modified ultrafiltration membrane is prepared by an immersion precipitation phase inversion method. A hydrophilic and hydrophobic low-surface-energy amphiphilic antifouling microarea appears on the surface of the modified membrane. According to the invention, the preparation method of the polymer modifier is simple; the membrane modification condition is mild and easy to realize; and the modified membrane has an excellent anti-biofouling effect and can be applied to sewage treatment.

The invention relates to a method of using a carbon nanofiber layer to modify an ultrafiltration membrane and belongs to the field of environment-friendly water treatment. The method includes: pre-treating carbon fiber to obtain granule-like carbon fiber; ultrasonically dispersing and stirring the granule-like carbon fiber after being pre-treated in a solvent sufficiently, and pre-depositing the carbon nanofiber which is uniformly dispersed on the surface of the ultrafiltration membrane. The carbon nanofiber pre-deposited on the surface of the ultrafiltration membrane is equivalent to a simple coating which preferentially adsorbs pollutants to reduce membrane pollution. The carbon nano fiber pre-deposited on the surface of the ultrafiltration membrane is rich in source, so that operation cost is lowered greatly. The carbon nanofiber pre-deposited on the surface of the ultrafiltration membrane and the ultrafiltration membrane are in physical deposition, so that the carbon nanofiber and the ultrafiltration membrane can be completely removed by using a plastic scraper to slightly scrape and using deionized water to clean after reaction is finished. The method is simple to operate, low in cost and easy in large-scale use and popularization.

The invention discloses a modified ultrafiltration membrane and a preparation method thereof. The preparation method of the modified ultrafiltration membrane comprises the steps of preparing a polyvinylidene fluoride ultrafiltration membrane, and then soaking the polyvinylidene fluoride ultrafiltration membrane in a nano-fiber boehmite solution to obtain the modified ultrafiltration membrane. By virtue of the above mode, the modified PVDF (polyvinylidene fluoride) ultrafiltration membrane with a strong hydrophilic property, a high membrane flux, and a strong anti-pollution capacity can be obtained.

The invention relates to a method for modifying an ultrafiltration membrane and provides a method for modifying an ultrafiltration membrane through a multiwalled carbon nanotube to solve the technical problem that the removing rate of an existing ultrafiltration membrane modified by a multiwalled carbon nanotube for ARGs is still low. The method comprises the steps that firstly, raw materials are weighed; secondly, a functionalized multiwalled carbon nanotube is prepared; thirdly, the ultrafiltration membrane is prepared; fourthly, a polyamide barrier layer is deposited; fifthly, an antifouling layer is smeared. The method has the advantages that after water is subjected to ultrafiltration through the prepared ultrafiltration membrane modified through the multiwalled carbon nanotube, most macromolecules can be removed, only few micromolecules are left, then a reverse osmosis method is adopted, and the antibiotics micromolecules in the water can be easily removed. By applying the method to treating drinking water, the treating process is simple, the treating effect is good, and the method is low in cost and suitable for implementation and popularization. The method is suitable for the field of water treatment.

The invention relates to an electric field coating process of an ultrafiltration membrane. The electric field coating process of the ultrafiltration membrane belongs to the technical field of water treatment membrane preparation, and comprises the steps of placing coating liquid containing negative charge TiO2 in a coating pond; immersing an ultrafiltration membrane component and a stainless steel plate electrode in the coating liquid; respectively connecting the ultrafiltration membrane component and the stainless steel plate electrode to positive and negative electrodes of a direct-current power supply; carrying out electric field coating under the electric field intensity being 30V/cm to obtain a coating modified ultrafiltration membrane with a TiO2 granular layer on the ultrafiltration membrane surface based on the ultrafiltration membrane component. The prepared modified ultrafiltration membrane can separate a colloidand a macromolecular organic compound, playing a leading role on membrane pollution, from a membrane surface by depending on the functions of adsorption and interception of a precoated layer on a pollutant, so that the membrane pollution is greatly reduced. During backwashing, the pollutant falls off from the membrane surface along with the precoated layer, the backwashing resistance of the membrane is reduced, and a backwashing effect is improved.

The invention relates to the technical field of blood products, in particular to a device and method for preparation of serum rich in alpha 2 macroglobulin by an improved ultrafiltration centrifugation process, and solves the problems of tedious extraction steps, progressively decreased protein activity in the extraction process and increased blood product contamination probability caused by the complicated extraction process in the existing alpha 2 macroglobulin purification method. The device consists of a centrifuge pipe and suction equipment, the centrifuge pipe consists of a common centrifuge tube and an ultrafiltration centrifuge tube, two ends of a first suction apparatus are respectively connected to target blood and the common centrifuge tube, two ends of a second suction apparatus are respectively connected to the common centrifuge tube's part accommodating supernatant and the bottom of the ultrafiltration centrifuge tube through a duct, and two ends of a third suction apparatus are respectively connected to the ultrafiltration centrifuge tube's part accommodating supernatant and an alpha 2 macroglobulin-rich serum collector through a duct. According to the invention, theseparation process does not destroy the activity of biological molecules, the recovery rate is high and the reproducibility is good.

The invention discloses a modified ultrafiltration membrane and a preparation method thereof. The modified ultrafiltration membrane comprises a filter tube and an ultrafiltration membrane, wherein theouter surface of the ultrafiltration membrane is fixedly connected with a sleeve; fixing grooves are formed in the two sides of the top and the bottom of the filter tube; the inner wall of each fixing groove is rotationally connected with a telescopic rod through a connecting block; one end of the telescopic rod penetrates through the fixing groove and extends to the outside of the fixing groove;one end, extending to the outside of the fixing groove, of the telescopic rod is rotationally connected with the arc-shaped plate through a connecting block; the quantity of the telescopic rods is two; a buffer spring is fixedly connected between the surfaces of the telescopic rods and positioned at the side, opposite to arc-shaped plate, of the inner wall of the fixing groove; a clamping springis fixedly connected onto the inner wall of the fixing groove and is positioned between the opposite sides of the surfaces of the two telescopic rods. The invention relates to the technical field of filtration. The modified ultrafiltration membrane and the preparation method have the advantages that the convenient replacement on the ultrafiltration membrane in the filter can be realized; the installation is stable; the modified ultrafiltration membrane cannot easily fall; certain cost is saved; good conditions are created for the subsequent filtering work.

The invention relates to the field of preparation of modified ultrafiltration membranes, and in particular relates to a multiwalled carbon nanotube-polyacrylonitrile (MWCNT-PAN) composite ultrafiltration membrane and a preparation method thereof. The MWCNT-PAN composite ultrafiltration membrane comprises the following raw materials, in parts by weight: 14-17 parts of a membrane substrate, 0.1-1.0part of acidified multiwalled carbon nanotube/Fe3O4/SiO2, 72-75 parts of a solvent, 12-15 parts of a pore-forming agent and 0.05-0.3 part of an anionic surfactant. According to the method provided bythe invention, the MWCNT-PAN composite ultrafiltration membrane prepared by the method not only can remove harmful heavy metal ions in water, such as Cr<3+>, Pb<2+> and Zn<2+>, but also has the advantages of strong mechanical properties, excellent anti-fouling performance, high water flux, an excellent retention rate and a long usage period.

The invention relates to a method for modifying an ultrafiltration membrane through a nano-particle coating, and belongs to the field of environmental water treatment. The method comprises the following steps: adding A into deionized water, then adding a flocculant; regulating pH to be neutral through an acid solution or an alkaline solution after the reaction is complete; heating the solution to be boiled to enable amorphous flocs in the solution to be granulated, leaving the solution to stand to be naturally cooled to room temperature, and loading particles in the solution to the surface of the ultrafiltration membrane in a constant pressure condition. According to the method for modifying the ultrafiltration membrane through the nano-particle coating, ano-particles pre-deposited on the surface of the ultrafiltration membrane preferentially adsorb pollutants, so that membrane pollution is reduced, the service life of the membrane is prolonged, and the water treatment efficiency is improved; besides, physical absorption is formed between the nano-particles pre-deposited on the surface of the ultrafiltration membrane and the ultrafiltration membrane, after reaction, the nano-particles can be completely removed after being scraped through a plastic scraper and are washed with deionized water, therefore the ultrafiltration membrane can be reused, the method is simple and easy to operate, liable to large-scale application, and convenient for promotion.

The invention discloses application of a high-dispersity hybridization antibacterial agent in aspect of ultrafiltration membrane improvement. The high-dispersity hybridization antibacterial agent is a nanometer hybridization material formed by anchoring silver nanoparticles to a graphene slice layer. The application of the high-dispersity hybridization antibacterial agent for ultrafiltration membrane improvement comprises the steps that firstly, the high-dispersity hybridization antibacterial agent is added into N,N dimethylacetamide or N,N dimethylformamide or dimethyl sulfoxide, ultrasonography is performed to obtain a uniform dispersion agent, polyvinylidene fluoride or polyether sulfone is added into the dispersion agent, stirring is performed at the temperature of 55-65 DEG C to obtain a uniform casting membrane solution, standing is performed for defoaming for 6-12 h, pure water is adopted as a coagulation bath, and an immerged phase-inversion method is adopted for preparing a modified ultrafiltration membrane. The high-dispersity hybridization antibacterial agent has the good dispersity in water and a solvent, the good compatibility of the high-dispersity hybridization antibacterial agent and a membrane matrix is achieved, the high-dispersity hybridization antibacterial agent can be applied to modifying the ultrafiltration membrane, the application method is simple, and the obtained modified ultrafiltration membrane is good in performance.

The invention discloses a cellulose gel layer modified loose nanofiltration membrane for high-flux dye separation as well as a preparation method and application of the cellulose gel layer modified loose nanofiltration membrane. The nanofiltration membrane comprises an ultrafiltration base membrane and a gel layer, the ultrafiltration base membrane is modified through codeposition coating of dopamine and carboxymethyl cellulose, the gel layer is of a compact three-dimensional network structure and is constructed on the surface of the modified ultrafiltration base membrane through two cross-linking reactions of carboxymethyl cellulose under the action of a cross-linking agent, the thickness of the nanofiltration membrane is 110 nm, and the pore diameter of the nanofiltration membrane is 1.38 nm. The ultrafiltration base membrane is one or more of a polyvinylidene fluoride ultrafiltration membrane, a polyether sulfone ultrafiltration membrane, a polysulfone ultrafiltration membrane and a polyimide ultrafiltration membrane, the ultrafiltration base membrane is the polyvinylidene fluoride ultrafiltration membrane, the thickness of the ultrafiltration base membrane is 100-400 microns, and the aperture of the ultrafiltration base membrane is 4.24 nm.

The invention provides a modification method for ultrafiltration membranes. The method includes the following steps: performing a first modification treatment to a macromolecular ultrafiltration membrane, wherein the first modification treatment includes amination treatment or carboxylation treatment; performing a second modification treatment to the macromolecular ultrafiltration membrane subjected to the first modification treatment to obtain a modified ultrafiltration membrane, wherein the second modification treatment is amidation between the macromolecular ultrafiltration membrane subjected to the first modification treatment and oligodeoxynucleotide adopting a hairpin structure, when the first modification treatment is amination, the oligodeoxynucleotide contains the carboxyl, and when the first modification treatment is carboxylation, the oligodeoxynucleotide contains the amido. According to the technical scheme, the reaction procedures are simple, the hairpin oligodeoxynucleotide can be synthesized according to man-made designs, the connection size is controllable, the protein blockage preventing efficiency of the connected macromolecular ultrafiltration membrane is high, the adsorbability to protein can be controlled through regulating and controlling the pH value of the medium to be filtered, and the application prospect is wide.

The invention discloses a modified ultrafiltration membrane capable of jointly inhibiting membrane biological pollution as well as a preparation method and an application of the modified ultrafiltration membrane. The preparation method of the modified ultrafiltration membrane capable of jointly inhibiting membrane biological pollution comprises the following steps: S1, preparing a modifying agent;S2, placing the polymer ultrafiltration membrane substrate in a modifying agent solution, and performing surface modification in a dark state; and S3, cleaning to obtain the tannic acid copper-iron surface modified polymer ultrafiltration membrane. The tannic acid copper-iron modified ultrafiltration membrane prepared by the preparation method disclosed by the invention has the advantages that firstly, the tannic acid copper-iron modified ultrafiltration membrane has extremely high biological pollution resistance, and by taking escherichia coli, bacillus subtilis and microcystis aeruginosa asexamples, the sterilization rate is 99.99 percent, the sterilization rate is 98.45 percent, and the algae inhibition rate is 98.43 percent; secondly, the water flux is not reduced, and the water fluxof the modified membrane is increased by 0.52% compared with that before modification; and thirdly, the stability is high, and the stability of copper ions is 84.50%.

The invention discloses a multifunctional amphiphilic comb-type polymer modifier, and a preparation method and application thereof. The preparation method of the modifier comprises the following steps: by using polydimethylsiloxane monomethyl ether-methacrylate (PDMSMA), polyethyleneglycol monomethyl ether-methacrylate (PEGMA), gamma-methylacryloyloxypropyltrimethoxy silane (KH570), an initiator and a solvent as raw materials, carrying out free-radical polymerization reaction under the protection of nitrogen gas, and treating to obtain the modifier. The application method comprises the following steps: dissolving the modifier, a nanoparticle precursor and a membrane material in a solvent according to a certain mass ratio, and preparing the organic-inorganic composite modified ultrafiltration membrane by an in-situ process. The modified membrane surface has low-surface-energy hydrophilic-hydrophobic amphiphilic antifouling microzones, and has certain roughness scale. The preparation method of the modifier is simple. The membrane modification is easy to implement. The modified membrane has favorable antifouling effect, and can be used for sewage treatment.

The invention discloses a preparation method of a modified ultrafiltration membrane by a layer-by-layer self-assembly technology. The method comprises the following steps: step 1, preparing a tertiaryamine polysulfone polymer: preparing a tertiary amine polysulfone copolymer by a condensation polymerization method; step 2, preparing a zwitterionic polysulfone polymer: preparing the zwitterionic polysulfone polymer by a condensation polymerization method; step 3, dissolving the zwitterionic polysulfone polymer prepared in the step 2 in a mixed solution of dimethylacetamide and ethanol to prepare a zwitterionic polysulfone polymer solution; step 4, immersing a polysulfone base membrane into the zwitterionic polysulfone polymer solution, taking out the polysulfone base membrane, and cleaningthe polysulfone base membrane with deionized water to obtain a polysulfone base membrane containing a zwitterionic polysulfone layer; and step 5, repeating the step 4 for 3-7 times. The zwitterionicpolysulfone polymer is self-assembled on the surface of the polysulfone base membrane by using the layer-by-layer self-assembly technology so as to modify the base membrane, and an assembly layer is relatively thin, so that relatively large flux and relatively good interception performance can be obtained.

The invention discloses a modified ultrafiltration membrane for removing sulfonamide antibiotics in water, and a preparation method and application thereof. According to the modified ultrafiltration membrane, polyvinylpyrrolidone (PVP), nanometer TiO2 and ferric trichloride (FeCl3) are used as additives, and a physical blending method is adopted to modify a PVDF ultrafiltration membrane. Under thecondition of the same PVDF content, through the addition of PVP, nanometer TiO2 and FeCl3, the number of membrane pores and the pore diameter of the membrane can be obviously increased, and the membrane pores are more uniformly distributed; since TiO2 and FeCl3 are added into the membrane, the hydrophilicity and wettability of the PPTFe membrane can be remarkably improved; and as the number and the size of the membrane pores are increased, the pure water flux of the membrane is obviously improved. The modified ultrafiltration membrane prepared by the method is combined with UV illumination toremove sulfadiazine, so a better removal effect is achieved. The preparation method is simple and convenient to operate and low in production cost.