13 results about "Polysulfone membrane" patented technology

The application relates to the technical field of composite materials, and discloses a mixed-fiber fabric reinforced thermoplastic composite material laminated plate and a preparation method and application thereof. The laminated plate is obtained by die molding a preformed body, wherein the preformed body comprises a plurality of mixed-fiber fabrics and thermoplastic resin films which are sequentially stacked in layers, and the thermoplastic resin film is selected from one or more of a polyamide film, a polyphenylene sulfide film, a polyether ether ketone film, a poly (aryl ether ketone) film, a polycarbonate film and a polysulfone film. The prepared thermoplastic laminated plate is uniform in resin distribution and excellent in comprehensive mechanical properties.

The preparation method comprises the following steps: step 1, first interfacial polymerization: immersing a polysulfone support membrane into a polyamine water phase solution, taking out the polysulfone support membrane, removing a solvent, immersing the polysulfone support membrane into an acyl chloride A part hydrolyzed oil phase solution, and carrying out first interfacial polymerization reaction, so as to obtain a polysulfone membrane; a nascent state reverse osmosis membrane is obtained; step 2, secondary interfacial polymerization: removing unreacted acyl chloride from the nascent state reverse osmosis membrane, then immersing the nascent state reverse osmosis membrane into an oil phase solution of acyl chloride B to carry out secondary interfacial polymerization reaction, and then carrying out heat treatment to obtain a reverse osmosis membrane semi-finished product; and step 3, third interfacial polymerization: immersing the semi-finished reverse osmosis membrane product into an oil phase solution of o-methylaniline, carrying out third interfacial polymerization, and carrying out heat treatment again to obtain the ultra-high-desalination and anti-oxidation reverse osmosis membrane. Under the condition of ensuring that the water flux is not greatly reduced, the ultra-high desalination rate of the reverse osmosis membrane is realized, and the service life of the membrane is prolonged.

The present invention relates to the method for efficient removal of phenolic compounds from wastewater generated from petroleum industry. The method is two-step process. The first step is a pre-treatment process which operates through adsorption-based separation using granular activated carbon. The wastewater in this step is allowed to pass through a column packed with granular activated carbon. In the second step, the pretreated wastewater is subjected to membrane-based treatment. The present invention also relates to the design of a special membrane for effective removal of phenolic compounds from waste water. The membrane formulation includes polysulfone as the main polymeric matrix and carbon dots coated powdered activated carbon as the additive which acts as the active agent for the removal of phenolic compounds. The membranes are designed in two different types, viz., (i) flat sheet and (ii) hollow fiber. The membrane-based separation using the flat sheet membranes can be done with the help of a dead-end filtration set up. In case of hollow fiber membranes, a cylindrical membrane module with a large number of hollow fiber membranes is designed. The membranes are reusable with excellent separation efficiency. The membrane module has proper feed inlet, outlet for permeates and outlet for retentates. This present invention provides removal of ~99% phenolic compounds from petroleum industry wastewater.

The utility model provides a semipermeable membrane for hemodialysis and a hemodialysis device. Specifically, the semipermeable membrane sequentially comprises a first polyester fiber non-woven fabric supporting layer and a second polyester fiber non-woven fabric supporting layer, a first chitosan layer; a porous polysulfone membrane, wherein the average pore size of pores in the porous polysulfone membrane is in the range of 5 nm to 50 nm; a second chitosan layer; and a second polyester fiber non-woven fabric supporting layer. The semi-permeable membrane for hemodialysis has good biocompatibility, wider waste removal capacity (besides small molecular substances (such as urea and creatinine), middle molecular substances (such as beta2-microglobulin) can be effectively removed) and good durability.

The application discloses a dopamine in-situ growth ZIF-8 dye / salt separation loose nanofiltration membrane and a preparation method thereof, and comprises the following steps: preparing a Tris buffer solution by taking a Tris buffer solution as a solvent and an alcohol-water mixed solution; preparing a precursor solution by adding dopamine, polyethyleneimine and a metal ion compound into the buffer solution; depositing the precursor solution on a polysulfone membrane surface; dissolving 2-methylimidazole in the alcohol-water mixed solution and then depositing the 2-methylimidazole on the polysulfone membrane surface; pouring off the excess solution, drying the membrane and then storing the membrane in deionized water to obtain a filter membrane. The nanofiltration membrane prepared by the application can intercept dyes and almost completely pass bivalent inorganic salts, and can fully separate a mixed solution of Congo red, methyl blue and sodium sulfate. Meanwhile, the application is simple in operation, can be popularized to various material substrates, and has great application value and development prospect.

A filtration membrane includes a polysulfone (PFS) membrane support, and a crosslinked polyamide layer disposed on the PFS membrane support. The crosslinked polyamide layer includes a network formed by polycondensation between diethylenetriamine and trimesoyl chloride, and graphene oxide (GO) nanosheets covalently bonded to the network via a linking spacer. The linking spacer includes a backbone chain having at least 8 backbone atoms. The backbone chain has a plurality of amine groups including —NH— and —NH2, and the linking spacer is bonded to the graphene oxide nanosheets via a —Si—O— bond and bonded to the network via reactions between trimesoyl chloride and the plurality of amine groups. A filtration method includes filtering a mixture including water and an organic molecule through the filtration membrane to generate a water permeate.

The application discloses a crosslinking type phosphoric acid doped polysulfone proton exchange membrane and a preparation method, and particularly relates to the following steps: firstly, a modified polysulfone containing isocyanate groups at the end is prepared, then 4-hydroxyethyl benzaldehyde is added for reaction, and then the modified polysulfone is dissolved in N,N-dimethylacetamide, and p-aminobenzene propyl triazole is added dropwise for Schiff base reaction to prepare a modified polysulfone membrane material containing active hydrogen at the end; then the modified polysulfone membrane material is dissolved in dimethylacetamide, nitrogen is introduced, and hexamethylene diisocyanate is added, dried, demolded, washed, and finally soaked in a phosphoric acid solution, and the crosslinking type phosphoric acid doped polysulfone proton exchange membrane is prepared. According to the method, the phosphoric acid groups are far away from the polymer main chain, the influence of water on the main chain is reduced, the number of phosphoric acid binding sites is increased, the phosphoric acid doped polysulfone proton exchange membrane can maintain a high phosphoric acid doping amount, and in addition, the proton exchange membrane can maintain good dimensional stability under high ion conductivity.

The application discloses a multifunctional layered composite film of MXene@h-BN and a preparation method and application thereof, and relates to the field of water treatment. The multifunctional layered composite film of MXene@h-BN is a layered composite film formed by assembling MXene@h-BN composite multifunctional material obtained by mixing MXene and h-BN through ball milling as a top layer on a base film. The MXene@h-BN obtained by mixing MXene and h-BN through ball milling is used as the top layer, a polysulfone film (PS) is used as the base, and the above two materials are coupled by using an interfacial cross-linking polymerization method, so that the multifunctional layered composite film of MXene@h-BN is prepared. After the multifunctional layered composite film of MXene@h-BN is coupled with a sunlight introduction device, the multifunctional layered composite film of MXene@h-BN is applied to the field of water treatment and has the following advantages: 1. the base PS film is assembled with the MXene@h-BN composite material, so that the membrane pore size is reduced, and the physical interception effect on pollutants is enhanced; 2. h-BN and MXene are excellent adsorption materials, and the adsorption and enrichment performance on micro-pollutants is enhanced; and 3. a heterojunction is formed between h-BN and MXene, the response to sunlight and the utilization efficiency are improved, so that the photocatalytic degradation of water micro-pollutants and membrane pollutants is realized, and the membrane self-cleaning function is realized.

The invention relates to the technical field of membrane materials, in particular to a fluoride-free hydrophobic polysulfone porous membrane as well as a preparation method and application thereof. The porous membrane comprises a matrix, and the matrix comprises first fibers; pores are formed among the first fibers, the PMI average pore size of the porous membrane is 0.1-10 [mu] m, and the porosity of the porous membrane is 30-80%; the porous membrane comprises a first surface and a second surface which are oppositely arranged; the first surface is in contact with the external environment; the initial water contact angle of the first surface is 95-160 degrees; according to an ATR method infrared absorption spectrum of the first surface, a first peak exists between 2910 cm <-1 > and 2930 cm <-1 >, a second peak exists between 1140 cm <-1 > and 1160 cm <-1 >, the ratio of the peak area of the first peak to the peak area of the second peak is a first hydrophobic coefficient X, and the first hydrophobic coefficient X is 0.001-0.4. The fluoride-free hydrophobic polysulfone porous membrane disclosed by the invention has both hydrophobic performance and air permeability, has relatively good mechanical property and long service life, and can be used as a waterproof air-permeable / sound-permeable membrane and an air sterilization membrane.

The application relates to a catalytic membrane preparation technology, and aims to provide a preparation and application method of MnO2@NiCu LDH catalytic membrane with a full non-radical process degradation. The method comprises the following steps: the whole polysulfone membrane is immersed in ultrapure water, one side surface of the polysulfone membrane is immersed in an ethanol aqueous solution containing fluorosilane at room temperature, cross-linking polymerization is generated between the fluorosilane and the surface structure of the polysulfone membrane; the polysulfone membrane with fluorosilane on one side is obtained by taking out and cleaning with deionized water; the MnO2@NiCu LDH catalyst is uniformly dispersed in an aqueous solution, and then the catalyst is assembled on the fluorosilane side of the polysulfone membrane through suction filtration; after drying treatment, the MnO2@NiCu LDH composite membrane is obtained. The composite membrane is applied to wastewater containing quinolone antibiotics, and the non-radical process in the catalytic activation degradation process is close to 100%; under different pH conditions, the composite membrane shows strong catalytic performance and a wide adaptability range. The product has strong anti-interference ability and wide application prospect, and effectively avoids the problem of powder catalyst recovery after water treatment.

The application relates to the field of membrane separation technology and discloses a preparation method of a high-lithium-ion-selectivity open-chain crown ether composite membrane. The method takes a polysulfone (PSF) membrane as a base film, adds an imine monomer in water, adds an acyl chloride monomer and an o-phenylenedioxydiacetyl chloride (OPDC) monomer in oil, introduces the OPDC monomer into a separation layer through an interfacial polymerization method, and prepares the open-chain crown ether composite membrane with high lithium ion selectivity. The open-chain crown ether composite membrane prepared through the method has excellent lithium ion separation performance and stability, and provides a reference idea for the preparation of ion selective membranes, efficient recovery and extraction of liquid phase lithium resources and other related fields.

This invention relates to a highly selective acid-resistant nanofiltration membrane, its preparation method, and its application, belonging to the field of membrane separation technology. The preparation method of the highly selective acid-resistant nanofiltration membrane includes the following steps: (1) immersing a polysulfone membrane in an aqueous solution containing a strong oxidant and metal chloride; (2) immersing the membrane treated in step (1) in a hexane solution containing pyrrole molecules and allowing it to stand; (3) spraying a mixed ethanol solution of phenol and formaldehyde onto the membrane treated in step (2); (4) placing the membrane treated in step (3) in a hot sodium hydroxide solution containing a surfactant for post-treatment to obtain the highly selective acid-resistant nanofiltration membrane. This invention features a simple process, readily available raw materials, and is suitable for industrial production; simultaneously, the highly selective acid-resistant nanofiltration membrane, while possessing strong acid resistance, exhibits high selectivity for both divalent and monovalent ions, making it suitable for the desalination treatment of acidic industrial wastewater.

The application relates to a novel modified ultrafiltration membrane and a preparation method, and relates to the technical field of wastewater treatment. The novel modified ultrafiltration membrane comprises the following steps: preparing a reduced graphene oxide solution; obtaining silicon carbide, and preparing beta silicon carbide by using the silicon carbide and silicon dioxide; and obtaining the reduced graphene oxide solution, the beta silicon carbide and polysulfone membrane filaments to prepare the novel modified ultrafiltration membrane. The novel modified ultrafiltration membrane fully combines the characteristics of the graphene oxide and the beta silicon carbide to realize efficient treatment of wastewater.