21 results about "Modified ultrafiltration" patented technology

The invention discloses a graphene oxide-reduced graphene oxide synergistic modified polyvinylidene fluoride ultrafiltration membrane as well as a preparation method and application thereof. The ultra-filtration membrane is prepared by a non-solvent induced phase separation method, and is characterized in that graphene oxide and reduced graphene oxide are synchronously added into a polyvinylidene fluoride membrane casting solution, and a composite lamellar structure with a hydrophilic-hydrophobic interpenetrating and embedding synergistic effect is constructed in a membrane forming process by utilizing the differences of the graphene oxide and the reduced graphene oxide in hydrophilicity, dispersity and chemical properties. The graphene oxide endows the membrane with lasting hydrophilicity and water transmission channels, and the reduced graphene oxide provides excellent antibacterial property, oxidation resistance, mechanical enhancement effect and resistance to strong solvents, salts, acids, alkalis, aromatic hydrocarbons, halogens and other media through closer stacking. According to the synergistic modified ultrafiltration membrane, the water flux and the interception performance are remarkably improved, meanwhile, the mechanical strength, the organic pollution resistance and the biological pollution resistance of the membrane are enhanced, and the synergistic modified ultrafiltration membrane is particularly suitable for efficient separation and purification of various complex and difficult-to-purify sewage such as oil-containing wastewater, pharmaceutical wastewater, chemical wastewater, biological wastewater and harsh wastewater.

The application discloses a preparation method and application of a polyacid tannic acid modified ultrafiltration membrane, and the preparation method comprises the following steps: preparing a casting solution containing a high molecular film forming material and a solvent; adding a polyoxometalate into the casting solution, uniformly mixing, and obtaining a polyacid modified casting solution; scraping and coating the polyacid modified casting solution to form a liquid membrane, pre-evaporating, immersing into a coagulation bath containing tannic acid to perform phase inversion and film forming, and obtaining the polyacid tannic acid modified ultrafiltration membrane. Through the synergistic effect of the polyacid blending regulation of the membrane pore structure and the in-situ coordination modification of the tannic acid phase separation, the simultaneous improvement of the permeation flux and the retention rate is realized, the pure water flux of the obtained ultrafiltration membrane reaches 221.37 LMH, the bovine serum albumin retention rate reaches 96.17%, and the preparation process is simple, efficient, and has a good large-scale application prospect.

This invention discloses a layer-by-layer deposition modified ultrafiltration membrane with both antifouling and antibacterial properties, its preparation method, and its applications. Through layer-by-layer assembly technology, a tannic acid (TA) anion layer and a polyhexamethylene biguanide (PHMB) cation layer are alternately deposited on the surface of an ultrafiltration membrane. Under weakly alkaline conditions, electrostatic interactions, hydrogen bonding, Schiff base reactions, and Michael addition reactions are simultaneously utilized to achieve both non-covalent and covalent bonding, constructing a stable and dense integrated antibacterial-antifouling composite coating. This coating has a contact-type antibacterial structure, which can effectively kill bacteria in water and inhibit biofilm formation at the source. Simultaneously, it significantly improves the hydrophilicity of the membrane surface, reduces pollutant adsorption and deposition, and achieves synergistic enhancement of antibacterial and antifouling properties. The preparation process of this invention is mild, simple, low-cost, and environmentally friendly. The modified membrane exhibits high flux retention, excellent separation performance, and excellent operational stability, and can be widely applied in water treatment scenarios such as municipal wastewater treatment.

The invention discloses a preparation method of bovine spinal cord peptide, belongs to the technical field of biology, and is used for solving the technical problems that in the prior art, degreasing agents such as petroleum ether are weak in polar lipid dissolving capacity, and enzymatic hydrolysate is separated by adopting a conventional nanofiltration membrane, so that the manufacturing cost is high, and the service life is short. The preparation method of the bovine spinal cord peptide comprises the following steps: S1, cleaning fresh bovine spinal cords, crushing the cleaned bovine spinal cords into blocks, and pulping the blocks to obtain homogenate tissues; adding a degreasing agent into the homogenized tissue, and performing ultrasonic treatment to obtain degreased spinal cord; s2, adding compound enzyme into the degreased spinal cord for reaction to obtain enzymatic hydrolysate; carrying out enzyme deactivation on the enzymatic hydrolysate in boiling water to prepare a bovine spinal cord crude peptide solution; s3, centrifuging the bovine spinal cord crude peptide solution, and collecting supernate; and passing the supernate through a modified ultrafiltration membrane, and circularly performing ultrafiltration for multiple times to prepare the bovine spinal cord peptide. According to the method, the homogenate tissue is deeply degreased by designing the composite degreasing agent with a surfactant-like structure; and the modified ultrafiltration membrane is used for improving the purity of the filtered bovine spinal cord peptide.

This invention discloses a PVDF-modified ultrafiltration membrane based on a tannic acid crosslinking network, its preparation method, and its applications. The membrane is prepared by a phase inversion membrane fabrication method using polyethyleneimine, tannic acid, polyvinylidene fluoride (PVDF), and N,N-dimethylacetamide (NDM). The pyrogallol structure abundant in the tannic acid molecule can coordinate with metal ions and also form a robust covalent crosslinking network with the amine-rich polyethyleneimine through Michael addition and Schiff base reactions. This network firmly anchors TA to the membrane surface and pores, solving the problem of TA loss in traditional modifications. The introduction of TA imparts lasting hydrophilicity to the membrane, significantly improving pure water flux and separation efficiency. Simultaneously, the hydrophilic and positively charged surface synergistically constructed by TA and PEI effectively inhibits the adsorption and deposition of pollutants, endowing the membrane with excellent antifouling performance and operational stability. This PVDF membrane, prepared through a green and simple co-crosslinking strategy, shows broad application prospects in complex water treatment and bioseparation.

The invention provides an ultrafiltration membrane hydrophilic treatment method which comprises the following steps: S1, soaking an ultrafiltration membrane in an organic solvent for full wetting to obtain a wetted ultrafiltration membrane; s2, putting the wetted ultrafiltration membrane into a microcapsule emulsion, and carrying out first soaking treatment to obtain a first soaked ultrafiltration membrane; s3, placing the ultrafiltration membrane after the first soaking in an organic weak acid solution for second soaking treatment to obtain a hydrophilic modified ultrafiltration membrane; wherein the microcapsule emulsion is formed by dispersing a microcapsule into water, the microcapsule has a core-shell structure, the core-shell structure comprises a microcapsule core and a microcapsule shell, the microcapsule core is inorganic nanoparticles, and the microcapsule shell is chitosan. The method is mild in reaction condition, simple in operation step and easy to realize industrialization.

The invention discloses a reverse osmosis membrane based on a perfluorosilane modified ultrafiltration membrane as well as a preparation method and application of the reverse osmosis membrane. The preparation method comprises the following steps: firstly, blending perfluorosilane and a membrane casting solution, and preparing the perfluorosilane modified ultrafiltration membrane by a phase inversion method; the ultrafiltration membrane is used as a supporting layer, and the surface of the ultrafiltration membrane is respectively impregnated with a water phase solution containing polyamine and an organic phase solution containing polyacyl chloride to prepare a polyamide separation layer. According to the method, perfluorosilane is introduced into the supporting layer through blending modification, the surface pore characteristics and physicochemical properties of the supporting layer are optimized, the interfacial polymerization process is effectively regulated and controlled, the surface of the separation layer is rougher, and therefore the effective water permeable area of the separation layer is increased. Meanwhile, a C-F long chain of the perfluorosilane endows pores in the supporting layer with strong hydrophobicity and low surface energy characteristics, and the transmission resistance of water molecules in the supporting layer is remarkably reduced. The separation layer and the supporting layer of the reverse osmosis membrane are synchronously optimized through the modified ultrafiltration membrane, and the water permeability of the reverse osmosis membrane is remarkably improved on the premise that the salt rejection rate is not sacrificed.

The invention discloses improved ultrafiltration heat preservation equipment, and relates to the technical field of medical instruments. The improved ultrafiltration heat preservation equipment comprises an ultrafiltration pipeline, an ultrafilter and a temperature control device, the ultrafiltration pipeline comprises an infusion catheter and a liquid outlet catheter; the liquid inlet end of the ultrafilter is communicated with the infusion catheter, the liquid outlet end of the ultrafilter is communicated with the liquid outlet catheter, the infusion catheter is suitable for inputting blood into the ultrafilter, and the liquid outlet catheter is suitable for outputting the blood filtered by the ultrafilter; the temperature control device is communicated with the liquid outlet catheter and used for adjusting the blood temperature. The structure of the improved ultrafiltration heat preservation equipment is improved, the temperature control device is used for controlling the blood temperature, the blood temperature can be kept within the normal range, arrhythmia and endangering the life of a child patient due to the fact that the body temperature of the neonate is rapidly decreased after improved ultrafiltration are avoided, the safety of improved ultrafiltration is greatly improved, meanwhile, operation is simplified, and the cost is reduced. And medical personnel do not need to adopt other operations to increase the body temperature of the child patient.

The invention belongs to the technical field of ocean wastewater treatment and resource recovery, and particularly discloses an integrated membrane treatment device and method for oil removal and lithium extraction of ocean platform production water.The device body comprises a first-stage oil removal unit and a second-stage lithium extraction unit which are sequentially connected, the first-stage oil removal unit adopts a hydrophilic modified ultrafiltration membrane or microfiltration membrane, and the second-stage lithium extraction unit adopts a hydrophilic modified ultrafiltration membrane or microfiltration membrane; the oil content of inlet water is reduced to below 10mg / L through cross-flow filtration; the secondary lithium extraction unit adopts a composite adsorption film loaded with a lithium ion sieve, selective lithium extraction is carried out on deoiled water, meanwhile, the device is integrated with a monitoring control system and a cleaning regeneration system, and a modular skid-mounted design is adopted. Through cooperation of two stages of functional membranes, deep oil removal and efficient lithium extraction are synchronously completed in a single compact system, the problems that an adsorption method is poor in oil stain resistance and process equipment is dispersed are solved, and the device has the advantages of being high in anti-pollution capacity, high in resource recovery rate, high in automation degree and suitable for offshore platform space limitation.

A negatively charged carboxylated carbon nanotube-modified ultrafiltration membrane: Carboxylated carbon nanotubes are placed in an aqueous solution of FeCl3·6H2O and stirred until homogeneous to obtain a mixed solution of carboxylated carbon nanotubes and hydrated iron oxide; KOH solution is added to the mixed solution of carboxylated carbon nanotubes and hydrated iron oxide, the pH is increased to 7, and then treated in a water bath. The precipitate is washed until neutral and no chloride ions are detected; after aspiration filtration, the precipitate is dried to obtain carboxylated carbon nanotube particles loaded with HFO; the HFO-loaded carboxylated carbon nanotube particles are dispersed in a diluent and ultrasonically treated; polymer particles and a pore-forming agent are added to the diluent sequentially, and the mixture is ultrasonically mixed and stirred until homogeneous. After standing to degas and cool, a casting solution is obtained; the casting solution is scraped onto a glass plate and placed in pure water to undergo non-solvent-induced phase separation. After phase inversion, a negatively charged carboxylated carbon nanotube-modified ultrafiltration membrane is obtained. This invention also provides a preparation method and applications.

The application discloses a preparation method of a high-efficiency positive-charged nanofiltration membrane for separating metal ions. The method is characterized in that a polysulfone ultrafiltration membrane base film is modified by graphene and SiO2, and then polyethylene imine (PEI) modified by polyglycidylamine (PGAM) is grafted on the modified ultrafiltration membrane to successfully prepare the positive-charged nanofiltration membrane. The nanofiltration membrane combines the high strength and hydrophilic advantages of graphene and SiO2, and is endowed with positive charges on the membrane surface through the modification of polyethylene imine and polyglycidylamine. The prepared positive-charged nanofiltration membrane significantly improves the separation efficiency and durability of metal ions, and has significant application value and broad prospects in key fields such as seawater desalination, wastewater treatment and resource recovery.

The application discloses a kind of self-cleaning filtration methods for water treatment, belong to gushing spring water treatment technical field;Including pretreatment, filtration adsorption treatment and disinfection treatment;Pretreatment stage, after centrifugal separation, gushing is added with the composite functional agent containing modified polyaspartic acid, modified glucosamine hydrochloride etc., and is filtered by microfiltration screen;Filtering adsorption treatment stage, after mixing pretreatment effluent with modified silicon dioxide-polyepoxysuccinic acid compound self-cleaning agent, into PVDF-TiO2 Compound modified ultrafiltration membrane module, membrane effluent is treated by nHAP-activated carbon composite adsorption column;Disinfection treatment stage, food-grade sodium hypochlorite is added to the advanced treatment water, and after disinfection, active carbon adsorption tank is handled to obtain treated gushing spring.The application can solve the problem that high turbidity and high calcium scale composite layer of karst rainy season gushing spring is difficult to remove, humic acid-calcium complex is difficult to adsorb, and high drug-resistant bacteria is difficult to disinfect.

The invention provides a ginseng-radix astragali extract essence plant beverage composition containing ginseng and radix astragali and a preparation method thereof, and belongs to the technical field of plant beverages. The composition takes an extract obtained by performing similar wild ginseng treatment on artificially planted ginseng as a core, and is matched with compound herbal raw materials such as astragalus membranaceus and angelica sinensis and functional auxiliary materials, the composition is prepared from the following raw materials in parts by weight: 0.8-1.5 parts of similar wild ginseng extract, 3-6 parts of astragalus membranaceus and the like, ginsenoside Rb1 in a finished product is more than or equal to 4.0 mg / g, Rg3 in the finished product is more than or equal to 4.5 mg / g, specific active peptide is contained, astragalus polysaccharide is more than or equal to 1.2 mg / mL, and the content of the active peptide is more than or equal to 1.0 mg / mL. The small molecule active component accounts for not less than 85%, and the solubility is not less than 98%. The core of the preparation method comprises the following steps: carrying out compound strain fermentation on artificially planted ginseng, carrying out compound enzymolysis, carrying out modified ultrafiltration membrane purification similar wild ginseng treatment, carrying out compound herbal synergistic extraction, mixing and blending, and carrying out instantaneous sterilization and filling. The invention solves the problems of low content of effective components, poor absorptivity and insufficient functionality of the traditional ginseng and astragalus drink.

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.

The invention belongs to the technical field of ultrafiltration membranes, and particularly relates to a modified polyvinylidene fluoride ultrafiltration membrane and a preparation method thereof. The method comprises the following steps: firstly, carrying out alkali activation treatment on PVDF (Polyvinylidene Fluoride), and then carrying out graft copolymerization reaction on the PVDF, vinyl methyl oxazolidinone and a zwitterionic monomer SBVI (Styrene-Butadiene-Vinyl Vinyl Chloride), so as to prepare a graft copolymer PVDF-g-P (VMOX-co-SBVI); and then blending with a PVDF (Polyvinylidene Fluoride) matrix to prepare a membrane casting solution, and carrying out blade coating, phase inversion and drying to obtain the modified ultrafiltration membrane. VMOX provides strong hydrophilicity and is beneficial to formation of a hydration layer and improvement of processing performance; the SBVI has the hydrophilic anti-pollution property of the sulphobetaine and the antibacterial function of the imidazole group at the same time. The two components have a synergistic effect, have good compatibility with PVDF, and can form a stable interpenetrating network in the membrane, so that dual prevention and control of pollutants are realized, and the mechanical property of the membrane is remarkably improved. By adjusting the blending ratio, the hydrophilicity, antibacterial property and mechanical strength of the membrane can be flexibly regulated and controlled, so as to meet different water treatment application requirements.

The application discloses a gradient pressurized concentration preparation method of an oligonucleotide high-concentration API solution and belongs to the technical field of medicines. The application first proposes a gradient pressurized-temperature control cooperative concentration process, introduces a pre-treatment step of osmotic pressure regulation, solves the problems of serious membrane pollution and low limit concentration in traditional constant pressure concentration, and can stably realize high-concentration concentration of 200-280 mg / mL. An amphoteric ion modified ultrafiltration membrane is adopted, online concentration monitoring and segmented temperature control transformation are carried out on traditional nanofiltration equipment, the anti-pollution ability of the membrane is obviously improved, the degree of automation of the concentration process is higher, and a reliable process scheme is provided for industrialized production of high-concentration oligonucleotide pharmaceutical preparations.

The invention discloses a modified ultrafiltration membrane and a preparation method of a dietary fiber coffee solid beverage, belongs to the technical field of food processing, and provides a modified ultrafiltration membrane dopamine and branched polysulfobetaine co-deposition ultrafiltration membrane and a preparation method of a dietary fiber coffee solid beverage. Comprising coffee beans obtained by wet processing of fresh coffee fruits and soluble dietary fibers extracted from coffee pericarp. The soluble dietary fiber oligosaccharide is obtained by separating the soluble dietary fiber obtained after enzymolysis of the coffee pericarp through the modified ultrafiltration membrane, and high-valued application of the coffee pericarp which is a coffee byproduct is achieved.

The invention belongs to the technical field of water treatment, and provides a preparation method of a self-assembled modified ultrafiltration membrane for efficient separation of phosphate and sodium chloride, and the preparation method comprises the following steps: soaking the surface of an ultrafiltration membrane base membrane with an isopropanol solution, and then washing; coating the surface of the prepared membrane with a PDADMAC self-assembly solution containing NaCl, pouring out the solution after reaction, cleaning and drying the membrane; and coating the surface of the prepared membrane with a NaCl-containing PSS self-assembled solution, pouring out the solution after reaction, cleaning the membrane, and drying the membrane to obtain the self-assembled modified ultrafiltration membrane. The prepared self-assembled modified ultrafiltration membrane is low in sodium chloride retention rate, large in water flux and high in phosphate retention rate, can separate high-salt pickling wastewater to obtain sodium chloride wastewater and phosphate, and is convenient for efficiently and respectively recovering sodium chloride and phosphate.

The application relates to a modified PES ultrafiltration membrane modified by a loose anti-pollution coating and a preparation method thereof. The method comprises the following steps: coating a pretreated PES base membrane with a double-monomer aqueous solution containing an amino monomer and a hydroxyl monomer and an isocyanate organic phase solution in sequence, and preparing the modified PES ultrafiltration membrane through an interfacial polymerization reaction at room temperature, and then washing and drying. The space steric hindrance effect of the hydroxyl monomer is utilized to avoid excessive crosslinking of the coating, and a loose three-dimensional hydrophilic crosslinking network containing urea bonds and urethane bonds is constructed in situ on the surface of the base membrane. The preparation method is mild in process and simple in operation, the modified ultrafiltration membrane is stable in coating and base membrane combination, the hydrophilicity and the anti-pollution capability are improved, the water flow permeation resistance is effectively reduced, the defects that the anti-pollution capability and the high flux are difficult to be compatible in traditional modified membranes are overcome, and the method is suitable for industrial application.

According to the iron-titanium oxygen cluster Ti4O (C3H7O) 15 (FeI) modified polyether sulfone ultrafiltration membrane as well as the preparation method and the application thereof, the ultrafiltration membrane is prepared by introducing iron-titanium oxygen cluster Ti4O (C3H7O) 15 (FeI) as a modifier into a PES membrane casting solution and adopting a phase inversion method. According to the modifier, the hydrophilicity, the mechanical strength and the anti-pollution performance of the membrane are remarkably improved. The introduction of the iron-titanium oxygen cluster increases the retention rate of the membrane to a methyl blue dye from less than 10% to more than 40%, and the membrane has efficient photocatalytic self-cleaning ability. Under light irradiation, dye pollutants adsorbed on the surface and in holes of the membrane can be effectively degraded, in-situ regeneration of the membrane is achieved, and the flux recovery rate (FRR) reaches up to 93% or above and far exceeds that of an unmodified membrane and a traditional nano TiO2 or Fe3O4 modified membrane. The preparation process is simple, the conditions are mild, and the prepared modified ultrafiltration membrane has wide application prospects in the fields of deep treatment of dye wastewater and resource recycling.