33 results about "Polyethersulfone membrane" patented technology

The application provides a virus-removing polyether sulfone porous membrane and a preparation method thereof. The virus-removing polyether sulfone porous membrane comprises, in sequence along a thickness direction, an outer layer region and an inner layer region, wherein the average pore size of the outer layer region is 10-20 nm, the thickness of the outer layer region is 20-50 microns, the average pore size of the inner layer region is 5-10 microns, and the thickness of the inner layer region is 60-150 microns; and the virus-removing polyether sulfone porous membrane is prepared by a method comprising at least the following process: taking polyether sulfone as a raw material, and obtaining the virus-removing polyether sulfone porous membrane under the action of a water-soluble diluent and a hydrophilic additive; wherein the water-soluble diluent comprises ethylene carbonate and polyethylene glycol. The virus-removing polyether sulfone porous membrane has a high virus removal rate and a high protein permeation rate.

This invention discloses a multi-stage treatment method for photovoltaic fluoride-containing wastewater based on semi-permeable membrane separation and the semi-permeable membrane thereof. The multi-stage treatment method includes the following steps: S1, primary treatment; S2, secondary treatment; S3, tertiary treatment. This method first performs primary treatment on the initially high-impurity fluoride-containing wastewater, which can rapidly degrade organic matter and heavy metals in the wastewater. Then, secondary treatment removes most of the heavy metal ions from the wastewater. Crystallization can effectively remove dissolved salts from the wastewater, while electrodialysis can concentrate and recover metal ions from low-concentration wastewater and desalinate the wastewater. Finally, tertiary treatment efficiently separates fluoride ions from the wastewater, and reverse osmosis filtration further removes the remaining fluoride ions and other dissolved salts, ensuring effluent quality. The semi-permeable membrane is a modified polyethersulfone membrane, and water quality is further purified by adding microorganisms.

This invention discloses a stable nalmefene hydrochloride injection and its preparation method, relating to the field of biomedical technology. The injection consists of nalmefene hydrochloride, sodium chloride, hydrochloric acid, and water for injection, and contains no metal ion chelating agents, with a pH value controlled between 3.5 and 3.6. The method includes: preparing the solution and adjusting the pH under high-purity nitrogen protection in a solution preparation system with low metal ion introduction risk; filtering the solution through a polyethersulfone membrane with low metal leaching, and then filling it into ampoules with a vulcanized inner surface. This invention, through the systematic integration of multiple measures such as source control of the solution preparation system, inert atmosphere protection, precise pH control, surface passivation of packaging materials, and the use of high-purity materials, synergistically inhibits the metal ion catalytic oxidation of the active ingredient, ensuring that the content of the key degradation impurity II (2,2'-bisnalmefene) remains stably below the quality standard during long-term storage, solving the problem of chemical stability control of products in chelator-free formulations, and combining safety and process robustness.

The invention discloses a bionic modification method of a hemodialysis membrane and application of the bionic modification method, and belongs to the technical field of medical materials.The method comprises the steps that vinylbenzylamine and vinyltriethoxysilane are dissolved in triethyl phosphate to be stirred, an initiator azodiisobutyronitrile is added, and heating polymerization is conducted to obtain a polymer [P (EP-VTES)]; carrying out amidation reaction to form a gallic acid functional polymer (Ga-EPTES); ga-EPTES is cross-linked to the surface of a polyethersulfone membrane in a monomolecular layer form, and the hemodialysis membrane with the functions of resisting oxidation and removing free DNA is prepared. According to the bionic modification method of the hemodialysis membrane, the functional limitation and modification defects of a traditional blood purification material are broken through, an efficient, safe and large-scale solution is provided for sepsis treatment, and the bionic modification method has scientific value and clinical transformation potential.

The invention discloses a method for predicting the performance of a GO separation membrane based on molecular simulation and a preparation method of the GO separation membrane. Based on a molecular dynamics simulation technology, revealing a relationship among a GO interlayer water distribution state, an interlayer spacing and a chemical environment, and obtaining an interlayer water distribution state beneficial to ion transmission and corresponding geometric and chemical parameters of the membrane; the GO ion separation membrane is prepared under the guidance, a suspension of single-layer GO is prepared, a polyethersulfone membrane is adopted as a substrate, and thermal reduction treatment is performed after vacuum filtration and membrane formation. By reasonably regulating and controlling the interlayer spacing and the chemical environment of the GO membrane, fine regulation and control are carried out on the distribution state of water molecules containing interface bound water and non-interface free water in a confinement channel, and selective transmission of Li < + > relative to Na < + > and Mg < 2 + > by the GO membrane can be realized.

The application relates to a method for purifying umbilical cord blood mesenchymal stem cell-derived exosomes, and relates to the technical field of bioengineering. The method combines gradient centrifugation and membrane filtration. First, the cell culture supernatant is pretreated by adjusting the pH, and cell debris and large-particle impurities are removed by multi-stage differential centrifugation. Then, selective protein precipitation is carried out by using polyethylene glycol with a specific molecular weight, and the exosomes are finely separated by sucrose-meglumine diatrizoate density gradient centrifugation. Finally, terminal purification is completed under low-temperature and low-pressure conditions by using a polyether sulfone membrane filtration system with optimized pore size. By precisely controlling the centrifugation parameters, reagent concentration and filtration conditions, the exosomes obtained by the method have a particle size concentrated in the range of 30-150 nm, a protein purity of more than 95%, and a recovery rate of more than 85%, and the separation efficiency and quality of the exosomes are significantly improved.

The application provides a composite pervaporation desalination membrane and a preparation method and application thereof. The composite pervaporation desalination membrane comprises a separation layer with a separation function and an organic porous base membrane layer serving as a support; the raw materials of the separation layer comprise a polyvinyl alcohol aqueous solution, a PFSA-g-GO nanocomposite and a crosslinking agent, the addition amount of the PFSA-g-GO nanocomposite is 0.2-4.5 mass%, the addition amount of the crosslinking agent is 1-10 mass%, and the mass% is the percentage of the mass of each component to the mass of the polyvinyl alcohol; and the organic porous base membrane layer is a polyacrylonitrile membrane or a polyethersulfone membrane. The preparation method is simple and easy to implement, and has low cost, and can simultaneously improve the water flux and desalination rate of the composite pervaporation desalination membrane.

The utility model discloses a hemodialysis filter with a blood perfusion adsorption function. The hemodialysis filter comprises a filter, two dialysate connectors, a plurality of hollow fiber filaments, two blood connectors and a plurality of adsorption particles. The two dialysate connectors are fixedly connected with the outer wall of the filter, the inner ends of the two dialysate connectors penetrate through the inner wall of the filter, and the dialysate connectors are used for conveying dialysate; the plurality of hollow fibers are mounted on the inner wall of the filter and are made of polyether sulfone membranes; the two blood interfaces are respectively connected in series with the two ends of the filter; the plurality of adsorption particles are mounted in the hollow fiber filaments which are far away from the blood connector and the dialysate connector and are 1 / 3-1 / 2 of the number of the hollow fiber filaments, and the adsorption particles are resin carbon soaked by heparin. According to the hemodialysis and perfusion combined device, the hemodialysis and perfusion functions can be simultaneously completed by a single device through the combination of the characteristics of the hemodialysis filter and the hemoperfusion device, so that the occurrence of infection of patients is reduced.

This invention relates to the field of wastewater treatment technology, specifically to a process and system for removing heavy metals from ink wastewater. It includes the following steps: coagulating ink wastewater with a metal composite coagulant, adsorbing and removing sludge wastewater with an ink sludge-based adsorbent, and filtering wastewater using a catechol-modified polyethersulfone membrane, followed by detection. This invention utilizes high-iron copper slag with titanium tetrachloride and acetylacetone to prepare a metal composite coagulant, transforming the copper slag into a high-value-added water treatment agent. This significantly reduces the production cost of the coagulant. Through the synergistic leaching of dilute sulfuric acid and hydrogen peroxide, the iron element in the copper slag is efficiently extracted and oxidized into Fe, which has a strong coagulation effect. 3+ The trace amounts of copper and other metal ions dissolved also provide a basis for subsequent composite reactions, thus improving the overall treatment efficiency and effluent quality of oily sludge wastewater.

This invention provides a high-performance polyethersulfone membrane and its preparation method, comprising the following steps: sulfonated polyethersulfone is blended with polyethersulfone and dissolved in a mixed solvent containing ionic liquid, and aminated nano-SiO2 particles are added, followed by ultrasonic dispersion to achieve covalent grafting, resulting in a premix; aminated Fe3O4 nanoparticles are added to the premix, and after ultrasonic dispersion, a crosslinking agent is added and stirred until homogeneous, resulting in a casting solution; the casting solution is degassed until no bubbles are visible, then cast onto a substrate, and coated using a doctor blade, with a magnetic field applied below the doctor blade during the coating process; the coated membrane is immersed in a coagulation bath, and through the synergistic effect of phase inversion and interfacial crosslinking reaction, a polyethersulfone membrane is obtained; the membrane exhibits high water permeability, antifouling properties, and high mechanical strength.

The present application belongs to the technical field of analytical chemistry, environmental monitoring and water quality online detection, and particularly relates to a hydroxyapatite-chitosan modified polyether sulfone membrane, a preparation method thereof and application of the membrane in detection of heavy metal ions in combination of membrane solid phase extraction and laser-induced breakdown spectroscopy. The present application mixes chitosan, hydroxyapatite and an aqueous glacial acetic acid solution to obtain a functional solution; the functional solution is coated on the surface of a polyether sulfone microporous filter membrane, and then solidified by alkali neutralization to obtain a hydroxyapatite-chitosan modified polyether sulfone membrane. The hydroxyapatite-chitosan modified polyether sulfone membrane provided by the present application can be well adapted to LIBS, can realize effective enrichment of trace heavy metals in a liquid sample to the membrane surface, can construct a high-stability solid target, and can realize rapid, high-sensitivity and high-anti-interference detection of heavy metal ions in the liquid sample.

The invention provides an anticoagulant hollow fiber membrane for blood purification and a preparation method thereof, and relates to the technical field of medical polymer membranes, and the preparation method comprises the following steps: respectively introducing a spinning solution and an internal solidification solution into a coaxial spinning nozzle for hollow fiber spinning, so that the spinning solution is firstly in contact with the internal solidification solution on a lumen side, an initial phase separation interface is formed on the lumen side, and the initial phase separation interface is formed on the lumen side; according to the preparation method, a hydrophilic polymer component and a surface anticoagulation modification component are introduced into a polyether sulfone membrane matrix, and the solvent exchange rate between an internal coagulation liquid and a spinning liquid is controlled in the spinning phase inversion process, so that a sulfobetaine polymer is directionally migrated to a lumen side interface and is enriched on a blood contact inner surface; on the premise of ensuring the structural strength of the membrane body and the stability of the pore structure, a high-density anticoagulation functional layer is constructed on a blood contact interface, so that the separation of structural support and interface functions is realized, the blood compatibility is improved, and the blood coagulation risk is reduced.

The invention provides an MXene-based metal ion cage membrane as well as preparation and application thereof, and belongs to the technical field of nanofiltration membranes. The MXene-based metal ion cage membrane provided by the invention comprises a hydrophilic modified polyethersulfone membrane, a first polyethyleneimine modified layer, a K < + > intercalation MXene membrane and a second polyethyleneimine modified layer which are sequentially laminated, and the K < + > intercalation MXene membrane comprises an MXene membrane formed by self-assembly of MXene nanosheets and K < + > intercalated between the MXene nanosheet layers. The MXene-based metal ion cage membrane provided by the invention has excellent stability in water, the rejection rate of dye molecules and metal cations is relatively high, and the filtering efficiency is relatively high.

The application relates to a modified two-dimensional material film and a preparation method and application, comprising a two-dimensional material film, the two-dimensional material film is subjected to electron beam irradiation; the irradiation dose of the electron beam irradiation is 5 kGy; the preparation steps of the two-dimensional material film are as follows: a solution of two-dimensional material powder is ultrasonically dispersed, the supernatant colloid with single-layer two-dimensional material lamella in the upper layer is taken as experimental material; the colloid solution is added into deionized water to dilute the solution concentration, and a glass rod is used to stir and uniformly mix; a polyether sulfone film with a pore size of 0.2 mu m and a diameter of 50 mm is used as a base film, the base film is placed on a vacuum filtration device, the diluted colloid solution is poured into the vacuum filtration device, water is pumped away through the vacuum filtration device, and the two-dimensional material is deposited on the base film to obtain a two-dimensional material film. The electron beam irradiation technology is a stable and convenient modification method, has good irradiation effect on the two-dimensional material, and according to different irradiation times, the two-dimensional film material with different strong and weak inductive effects is obtained.

The invention belongs to the technical field of polyethersulfone, and particularly discloses a highly asymmetric polyethersulfone membrane and a preparation method thereof. The highly asymmetric polyethersulfone membrane is prepared through dual induction based on a specific membrane casting solution system, the microstructure is of a porous structure, the membrane thickness is 100-130 microns, the highly asymmetric polyethersulfone membrane is sequentially divided into a macroporous layer and a microporous layer in the thickness direction, the average aperture ratio of the macroporous layer to the microporous layer is larger than or equal to 50, and the thickness ratio of the macroporous layer to the microporous layer is (1-4): (1-2). On the premise that the macropore depth can be regulated and controlled, the macropore depth of the membrane can be deepened, and a certain compact layer (namely a micropore layer) thickness of the membrane can be kept, so that the separation capacity and the service life of the membrane can be ensured while the filtration capacity of the membrane is improved.

This invention belongs to the technical field of covalent organic framework membrane materials, and provides a covalent organic framework / polyethersulfone hybrid matrix membrane, its preparation method, and its application. The method includes the following steps: mixing polyethersulfone, a solvent, and trialdehyde resorcinol to obtain a trialdehyde resorcinol solution; coating the trialdehyde resorcinol solution onto a glass fiber filter membrane to obtain a trialdehyde resorcinol / polyethersulfone membrane; mixing p-phenylenediamine, a catalyst, and water to obtain a p-phenylenediamine solution; and immersing the trialdehyde resorcinol / polyethersulfone membrane in the p-phenylenediamine solution to react, thereby obtaining the covalent organic framework / polyethersulfone hybrid matrix membrane. The preparation method of this invention is mild, and the resulting membrane is uniform and stable, fully combining the advantages of high polymer flux and strong CO2 adsorption and separation by covalent organic frameworks, significantly improving the H2 flux and H2 / CO2 selectivity of the covalent organic framework / polyethersulfone hybrid matrix membrane.

The present disclosure is related to a polymeric membrane, comprising a modified surface obtained from coating with hydrophilic monomers and curing the hydrophilic monomers with actinic irradiation, preferably UV light, wherein the hydrophilic monomers comprise at least one amino moiety; at least one polyoxyalkylene unit; and at least one (meth)acrylate moiety.

The invention relates to the technical field of wastewater treatment, in particular to a process and a system for removing heavy metals from printing ink wastewater. Comprising the following steps: coagulating printing ink wastewater by using a metal composite coagulant, adsorbing sludge removal wastewater by using a printing ink sludge-based adsorbent, filtering the wastewater by using a catechol-based modified polyether sulfone membrane, and detecting. According to the method, the high-iron-content copper slag, titanium tetrachloride and acetylacetone are used for preparing the metal composite coagulant, the copper slag is converted into a water treatment agent main body with the high additional value, the production cost of the coagulant is greatly reduced, and through collaborative leaching of dilute sulphuric acid and hydrogen peroxide, the water treatment efficiency is greatly improved; the iron element in the copper slag is efficiently extracted and oxidized into Fe < 3 + > with a strong coagulation effect, and the dissolved trace copper and other metal ions also provide a basis for the subsequent composite reaction, so that the treatment efficiency of the oil sludge sewage and the effluent quality are integrally improved.

This invention discloses a polyethersulfone (PES) ammonia separation membrane based on imidazolium-cobalt coordination synergy and its preparation method, comprising the following steps: using polyethersulfone as a raw material, it undergoes a chloromethylation reaction under anhydrous conditions to introduce a -CH2Cl active site into the aromatic ring side chain of polyethersulfone, thereby obtaining chloromethylated polyethersulfone; the chloromethylated polyethersulfone is subjected to a nucleophilic substitution reaction with an imidazolium compound to obtain imidazolium-functionalized polyethersulfone with chloride ions as the counter ion; and after membrane formation, the imidazolium-functionalized polyethersulfone membrane is immersed in a mixed solution of potassium thiocyanate and cobalt chloride, utilizing the in-situ formed cobalt thiocyanate coordination anion to counteract the chloride ion. ‑ By performing a displacement reaction, a polyethersulfone ammonia separation membrane based on imidazolium-cobalt coordination synergy is obtained. The polymer membrane obtained in this invention has a stronger selective dissolution and enhanced transfer capability for ammonia, and can achieve efficient and stable ammonia enrichment in the separation of ammonia-containing mixed gases.

The application discloses a kind of optical fiber bragg sensor and system for monitoring lithium ion battery thermal runaway, it is related to optical fiber bragg sensor technical field.The optical fiber bragg sensor includes optical fiber core and first pillar element and second pillar element, the first pillar element is coated with Pt-WO3 film outside, the second pillar element is coated with polyether sulfone film outside, the Pt-WO3 film and polyether sulfone film are obtained by solvent evaporation method preparation.The optical fiber bragg sensor can obtain the concentration of lithium ion battery internal hydrogen and carbon dioxide gas simultaneously, according to the concentration of hydrogen and carbon dioxide, judge whether the phenomenon of thermal runaway appears in lithium ion battery inside, so as to take measures as soon as possible, avoid the occurrence of fire;And, since the Pt-WO3 film and polyether sulfone film are obtained by solvent evaporation method preparation, with the characteristics of film layer thickness uniform, target gas response sensitive.

The application discloses a high-permeability and high-selectivity polyester amide composite nanofiltration membrane and a preparation method and application thereof. The preparation method comprises the following steps: 1) dissolving chrysenel[33]a and piperazine in water to prepare an aqueous solution; 2) storing a polyethersulfone membrane with a pore size of 0.22 mu m in deionized water, taking out the membrane, and absorbing water on the surface of the membrane with filter paper; 3) immersing the membrane obtained in the step 2) in the solution obtained in the step 1), soaking, taking out the membrane, absorbing liquid on the surface of the membrane with filter paper, and then immersing the membrane in a trimesoyl chloride solution prepared by using n-heptane as a solvent, soaking, taking out the membrane, and heat-treating and cross-linking to obtain a high-permeability and high-selectivity polyester amide composite nanofiltration membrane. The polyester amide composite nanofiltration membrane prepared by the application has a low nanofiltration membrane separation layer thickness, the ultra-thin separation layer can greatly shorten the mass transfer path of water molecules in the membrane, cooperates with the multi-cavity mass transfer channel of the chrysenel[33]a itself, and can significantly improve the water permeation flux and separation performance of the membrane.

The invention belongs to the technical field of polyethersulfone, and particularly discloses a polyethersulfone film with a double-layer structure and a preparation method of the polyethersulfone film. The polyethersulfone membrane is prepared by adopting a single solution coating on the basis of a specific solution composition system through an upper and lower layer dual induction process, and the cross section of the membrane is in a highly asymmetric form with a double-layer structure integrally; the upper layer is of a coarse-branch continuous macroporous structure and can accommodate more intercepted particles, so that the service life of the membrane is prolonged; the lower layer is of a fine branched continuous small hole structure, so that interception of particles can be ensured, and the filtering quality is improved; the upper layer and the lower layer are communicated in aperture, the structural cohesion is good, and no fracture phenomenon occurs; the thickness ratio of the upper layer to the lower layer is (2.5-3.5): 2; the preparation technology is simple and controllable in process, easy to implement, low in equipment requirement and suitable for batch production.

The invention discloses a modified sulfonated polyethersulfone membrane as well as a preparation method and application thereof, and the preparation method of the membrane comprises the following steps: preparing a membrane from a sulfonated polyethersulfone solution by adopting a tape casting method, drying, immersing the formed membrane into an acrylic acid solution, initiating a grafting reaction by ultraviolet light, and then washing and drying to obtain the modified sulfonated polyethersulfone membrane. The carboxyl is grafted to the surface of the membrane through ultraviolet initiation, so that the physical and chemical properties such as hydrophilicity and hydroxyl conductivity of the membrane are remarkably improved, and efficient transmembrane transportation of carriers is realized.

The invention belongs to the field of bag type filter processing, and particularly relates to a polypropylene hydrophilic welding method for a bag type filter. The method comprises the following steps: (1) carrying out plasma treatment on a polypropylene component for the bag type filter to obtain a plasma modified polypropylene component; (2) mixing ovalbumin and tannic acid, and adding a pH regulator to obtain a mixed solution; (3) immersing the plasma modified polypropylene component into the mixed solution for reaction, and taking out and drying after the reaction is completed, so as to obtain a hydrophilic modified polypropylene component; and (4) melting the hydrophilic modified polypropylene component, and integrally welding the hydrophilic modified polypropylene component with the polyethersulfone membrane to form a complete bag type filter assembly. Plasma destroys chemical bonds on the surface of polypropylene to form polar groups, and the mixed solution and the polar groups are crosslinked to form a stable hydrophilic layer. Good wetting can be achieved without pressurization, the performance of a polypropylene body is reserved, the process is simple, and the method is suitable for industrial production.

The application belongs to the technical field of forward osmosis separation membrane, and particularly relates to a preparation method of a nanoparticle blending modified forward osmosis membrane and application thereof. The application first adopts a phase inversion method to form a porous network structure polyether sulfone membrane as a base membrane of the forward osmosis membrane through exchange of a solvent and a non-solvent to initiate phase separation, and then utilizes an interfacial polymerization reaction of m-phenylenediamine and triformyl chloride to prepare a dense polyimide active layer on the base membrane. The nanoparticle blending modified forward osmosis membrane is prepared through modification of the base membrane and the active layer. The membrane not only has excellent pure water flux and oil retention rate, can realize efficient and stable oil-water separation, and is excellent in anti-fouling performance and long-term stability, but also has a good morphology, the preparation method is simple and easy to implement, the cost is low, and the membrane can be mass-produced. The nanoparticle blending modified forward osmosis membrane has a wide application prospect in the field of membrane treatment oil-water separation, and can be applied to technical fields such as environmental governance and new energy.

The application discloses a modified carbon nanotube and mackinaw cloth composite doped polyether sulfone membrane and a preparation method thereof, and the preparation method comprises the following steps: step 1, combining MWCNTs and EGCG by using a non-covalent grafting method to prepare E-MWCNTs; step 2, performing amino functionalization on Mxene by using AEAPTMS to obtain A-Mxene; and step 3, preparing a PES mixed matrix membrane with E-MWCNTs and A-Mxene as dopants by using a phase inversion method. The polyether sulfone water treatment membrane can efficiently remove dirt through electric assistance in the use process, can achieve a high flux recovery rate, can prevent bacterial pollution, can prolong the service life of the membrane and can reduce the cost.

The utility model relates to the technical field of blood filtering and collecting devices, in particular to a blood filtering and collecting device of a cattle and sheep blood drawing operation table, which comprises a support, a filtering piece is fixed on the surface of the support through a fixing piece in a butt joint mode, the filtering piece comprises a puncture needle, and the bottom end of the puncture needle is connected with a drainage tube. The tail end of the drainage pipe is in butt joint with a polyethersulfone membrane filter, the bottom end of the polyethersulfone membrane filter is in butt joint with a hopper cover, the hopper cover is buckled on the surface of a hopper, the bottom end of the hopper is in butt joint with a collecting bag, and a speed adjusting part is arranged at the pipeline end of the polyethersulfone membrane filter. According to the utility model, by pressing the scale strip, the scale strip is controlled to push the pressing plate, so that the pressing plate applies pressure to the pipeline surface of the polyethersulfone membrane filter, and the flow velocity of blood in the pipeline of the polyethersulfone membrane filter is adjusted and changed; therefore, the filtering effect of the polyethersulfone membrane filter is ensured, the filter is prevented from being blocked, blood components are protected, the detection accuracy is ensured, and the detection efficiency is improved to a certain extent.

Some embodiments of the present application provide a plasma adsorption filter and use thereof. According to the embodiments of the present application, the plasma adsorption filter comprises a filter and an adsorber. The filter and the adsorber are laid flat and connected by means of adhesive bonding. The filter is a polyethersulfone membrane, and the adsorber is an aldocellulose membrane. The thickness of the polyethersulfone membrane is 25-30 μm, and the thickness of the aldocellulose membrane is 0.01-100 μm. The aldocellulose membrane is a dialdehyde-modified cellulose membrane.

The invention provides an antibacterial polyethersulfone film based on a tea polyphenol-silver composite coating and a preparation method thereof.The preparation method comprises the steps that a polyethersulfone film is pretreated and then immersed in a water-phase solution containing tea polyphenol and inorganic salt, and the tea polyphenol is adsorbed and enriched on the surface and in pore channels of the polyethersulfone film; then transferring the polyethersulfone film into a solution containing silver salt, generating and fixing dispersed silver nanoparticles in situ under the reduction and coordination action of tea polyphenol, and forming a tea polyphenol-silver composite antibacterial coating; and washing and carrying out moderate-temperature heat treatment to obtain the modified polyethersulfone membrane. The surface of the polyethersulfone membrane is remarkably hydrophilized, the silver nanoparticles are uniformly distributed, and the polyethersulfone membrane has excellent antibacterial property and anti-pollution property, can effectively inhibit bacterial adhesion and biological membrane formation, reduces flux attenuation and improves flux recovery rate.

This invention relates to the food industry, specifically disclosing a method for preparing a rapeseed oil decolorizing membrane. The method includes: 1) Preparing the casting solution: Polyethersulfone powder, polyvinylpyrrolidone, distiller's grains, and SiO2 are added to N,N-dimethylacetamide and stirred until fully dissolved. The solution is then allowed to stand in an oven to remove bubbles, yielding the casting solution; 2) Coating the membrane: The prepared casting solution is poured onto a coating table, and the membrane is coated and then placed in air to allow the solvent to evaporate; 3) Forming the membrane: The membrane, after evaporation, is immediately immersed in distilled water. Once the membrane separates from the coating table, it is removed and soaked in distilled water for at least 24 hours. The membrane is then removed and air-dried. The composite polyethersulfone membrane prepared by this invention exhibits good ultrafiltration performance, requires no organic solvents, and can directly decolorize rapeseed oil without producing toxic or harmful substances. The method is convenient to operate and poses no environmental burden.