470 results about "Zwitterion" patented technology

The invention discloses a desalting membrane as well as a preparation method and application thereof, and relates to the technical field of membrane separation. The desalting membrane comprises a porous ultrafiltration base membrane and a functional layer formed on the surface of the porous ultrafiltration base membrane; the functional layer is formed by copolymerizing and cross-linking a polyamine monomer, a zwitterionic multi-element hydroxyl monomer and an acyl chloride monomer through an interfacial polymerization reaction. The preparation method comprises the following steps: providing the porous ultrafiltration base membrane; coating the surface of the porous ultrafiltration base membrane with an alkaline water-phase solution containing a polyamine monomer and a zwitterionic multi-hydroxyl monomer to form a water-phase solution layer; coating an oil-phase solution containing an acyl chloride monomer on the surface of the water-phase solution layer to form a functional layer; and performing heat treatment. The invention also provides application of the desalination membrane in any one of seawater desalination, brackish water desalination, wastewater treatment and material separation and concentration. According to the invention, zwitter-ion-based multi-hydroxyl monomers are introduced into water-phase monomers to participate in interfacial polymerization, and a super-hydrophilic nano-channel is constructed in a separation layer, so that the water flux and the desalination rate of the membrane are remarkably improved.

The invention is based, at least in part, on the discovery that replacement of a key bond in the near-infrared fluorophore with a carbon-carbon bond conjugation to a targeting ligand results in vastly increased stability as compared to NIR fluorophores without such a bond, while preserving ligand and zwitterionic properties. In at least one aspect, the invention provides an imaging agent dye comprising a charge-balanced imaging agent conjugated to a targeting vector, wherein the targeting vector is a PSMA binding vector, such as dPSMA-617 or KUE, a FAP binding vector, a bombesin receptor binding vector, or a somatostatin receptor binding vector, and the charge-balanced imaging agent is ZW-800-1, ZW-830-1, or ZW-700-1-Forte.

The invention relates to the technical field of soil remediation, in particular to a biochar-humic acid-calcium alginic acid composite saline-alkali soil modifier and a preparation and application method thereof. The modifier adopts a multi-layer structure design: biochar is pre-adsorbed by calcium chloride, compounded with sodium humate, and then crosslinked with sodium alginate to form a gel to form a composite inner core; secondly, sulfobetaine methacrylate and vinyl phosphonic acid are introduced into a sodium alginate molecular chain through graft polymerization, and modified sodium alginate is obtained to serve as an outer layer coating material; and finally, dipping the composite inner core into the outer layer solution, and carrying out graded recalcification by calcium chloride and short-time treatment by sodium sulfate to obtain a final product. Through the synergistic effect of calcium ion slow release of the inner core and zwitterionic characteristics of the outer layer, efficient replacement and long-term stable regulation and control of soil sodium ions are achieved, the pH value, the conductivity and the alkalization degree of soil are remarkably reduced, the water holding capacity is effectively improved, and the soil conditioner is suitable for sustainable improvement of moderate and severe saline-alkali soil.

The present invention provides an organic phosphonic acid betaine and a preparation method thereof, specifically an ammonium phosphonic acid betaine containing a glycidyl group. The organic phosphonic acid betaine can be used as a functional monomer for free radical grafting modification of the surface of a polymer material such as polyolefin, or can be mixed with acrylate, acrylonitrile or other olefin monomers for copolymerization to prepare an amphoteric ionomer. The organic phosphonic acid betaine can also be used for ring-opening grafting modification of polymer materials such as starch, cellulose, polyurethane, and polyamide containing amino or hydroxyl groups in their structures. At the same time, the phosphonic acid betaine imparts functional effects such as zwitterionization, hydrophilicity, antibacterial properties, and antifouling properties to the obtained polymer material. The organic phosphonic acid betaine also has high chemical stability in acidic and alkaline water environments.

The invention belongs to the field of graphene textile wastewater treatment, and particularly relates to a graphene oxide-based zwitterionic composite filtering film as well as preparation and application thereof. The SBMA is modified to the GO surface through graft polymerization to form a physical intercalation composite structure, so that the hydrophilicity, interlayer spacing and antifouling property of the membrane are remarkably improved. The retention rate of the composite membrane on methylene blue exceeds 99%, the salt separation factor reaches 180.75, and the flux recovery rate (FRR) is kept above 80% after circulation. The membrane preparation process is green and environment-friendly, is suitable for high-efficiency separation of dye and salt in textile wastewater, and has a wide application prospect.

The invention discloses a zwitter-ion modified acrylate dielectric elastomer film and a preparation method thereof. Zwitter-ions can be selected from sulfobetaine methacrylate (SBMA), carboxyl betaine methacrylate (CBMA), sulfobetaine acrylamide (SBAA) and the like. The acrylate monomer can be butyl acrylate (BA), dodecyl acrylate (LA), isoamyl acrylate (EHA) and the like. Zwitterions (special compounds which simultaneously carry equal positive and negative charges on the same molecule and are electrically neutral on the whole) are copolymerized into an acrylate dielectric elastomer through photo-initiated free radical polymerization reaction, zwitterionic clusters uniformly distributed in the dielectric elastomer can construct traps for capturing high-energy electrons, the leakage current of the material is reduced, and the dielectric property of the material is improved. And the intrinsic breakdown field strength of the material is improved. In addition, the mutual attraction effect between dipole ions with positive and negative charges in the structure provides driving force for intrinsic self-repairing. And after being electrically and mechanically damaged, the material can be self-recovered, so that the service life of the material is prolonged.

The invention belongs to the technical field of thermoelectric materials and functional polymer materials, and particularly relates to thermoelectric hydrogel based on synergistic enhancement of zwitterions and a polar solvent as well as a method and application of the thermoelectric hydrogel. The thermoelectric hydrogel is obtained through the steps that a precursor solution is subjected to a polymerization reaction to form a gel matrix, then the gel matrix is soaked in a soaking solution, potassium ferricyanide / potassium ferrocyanide redox couple is introduced, and the thermoelectric hydrogel is obtained, and the precursor solution is prepared from acrylamide, N-isopropylacrylamide, dimethyl sulfoxide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide and N, N-dimethylformamide. The photoinitiator is prepared by mixing N, N-dimethylformamide, 1-ethyl-3-methylimidazolium tetrafluoroborate, a zwitterionic monomer [2-(methylacryloyloxy) ethyl] dimethyl-(3-sulfopropyl) ammonium hydroxide, a cross-linking agent N, N '-methylene bisacrylamide, a photoinitiator and deionized water. The thermoelectric hydrogel prepared by the invention has high mechanical strength, high ductility and high Seebeck coefficient, and has better temperature resistance.

The invention discloses zwitterion co-doped CeO2 abrasive particles and a preparation method and application thereof.The preparation method includes the steps that a cerium source and a soluble carbonate precipitator are subjected to an aging reaction to obtain a cerium-based precursor, and the cerium-based precursor, fused salt, metal ions and a fluorinating agent are mixed and then roasted to obtain the zwitterion co-doped CeO2 abrasive particles; the synthesis method is simple, the size is controllable, the particle size distribution is uniform, and the spherical-like zwitterion co-doped CeO2 abrasive particles are obtained; the co-doped CeO2 abrasive particles have excellent photo-assisted chemical mechanical polishing performance; when the polishing solution prepared from the sphere-like co-doped CeO2 abrasive particles synthesized by the method is used for processing the surface of quartz glass, the material removal rate reaches 988.69 nm / min, and a high material removal rate is obtained due to the fact that the co-doped CeO2 abrasive particles synthesized by the two-step method shorten the forbidden bandwidth and have high chemical activity, so that the material removal rate is favorably improved.

The invention provides a high slump loss resistant aliphatic water reducer with a branched structure and a controllable polymerization preparation method of the high slump loss resistant aliphatic water reducer. The water reducing agent is prepared from the following components in parts by weight: 14 to 24 parts of acetone, 19 to 29 parts of formaldehyde, 7.5 to 11.5 parts of sodium hydrogen sulfite, 3.5 to 6.5 parts of four-arm star-shaped low-carbon hydrophobic core, 2.5 to 5.5 parts of amide-ester bifunctional slow-release monomer, 2.0 to 4.5 parts of zwitter-ion-phosphonic acid based clay inhibitor and 60 to 90 parts of deionized water. The obtained water reducing agent has good initial dispersibility, stable adsorbability, excellent slump loss resistance and relatively strong clay interference resistance.

The invention belongs to the technical field of electrochemical detection, and discloses an anti-pollution electrochemical saliva sensor based on fluorinated side chain polypeptide as well as a preparation method and application of the anti-pollution electrochemical saliva sensor. The fluorinated side chain polypeptide disclosed by the invention not only has excellent hydrophilicity, can form a dense hydration layer with water molecules to repel pollutants, but also has low surface energy, and the interaction between the pollutants and an interface is remarkably reduced. Through the synergistic effect, the fluorinated side chain polypeptide has better anti-pollution performance compared with traditional zwitterionic polypeptide. The anti-pollution electrochemical sensor constructed on the basis of the fluorinated side chain polypeptide can be used for directly detecting CA15-3 in saliva, the saliva does not need to be pretreated, and the detection accuracy can be comparable with that of a commercial ELISA (Enzyme-Linked Immunosorbent Assay) method.

The invention relates to a preparation method of a water electrolysis hydrogen production composite electrode based on a zwitterionic polymer binder. According to the method, a traditional ionic binder Nafion is replaced with a zwitterionic polymer polysulfobetaine methacrylate, an electrode-electrolyte interface is optimized through a unique electrically neutral hydration layer structure, the rapid desorption behavior of bubbles is enhanced, and efficient transmission of reaction ions is also promoted; and regulating and controlling the mass ratio of the PSBMA binder to the catalyst by using a spraying process. The invention aims to overcome the defects of high cost, insufficient mass transfer and poor interface stability of the existing Nafion binder, and provides the composite electrode taking PSBMA as the binder and the preparation method of the composite electrode, and the provided composite electrode is simple in preparation process and controllable in cost, and has good popularization and application prospects.

The invention relates to the technical field of membrane separation, in particular to a zwitter-ion modified MXene composite membrane as well as a preparation method and application thereof. The method comprises the following steps: S1, preparing a zwitterionic copolymer; s2, blending the zwitterionic copolymer and an MXene nanosheet, so as to obtain an MXene / zwitterionic copolymer dispersion liquid; and S3, preparing the zwitter-ion modified MXene composite membrane on the surface of a porous support layer by using the MXene / zwitter-ion copolymer dispersion liquid through a vacuum filtration method. The zwitter-ion modified MXene composite membrane and the preparation method thereof aim at solving the technical problems that an existing MXene membrane is prone to swelling in water and has defects, so that the separation performance and the pollution resistance are poor, and the obtained zwitter-ion modified MXene composite membrane can inhibit membrane swelling, improve hydrophilicity and pollution resistance and synergistically optimize water flux and selectivity.

The invention belongs to the technical field of biomedical materials, and particularly relates to a poly-4-methyl-1-pentene (PMP) gas-blood exchange membrane for an extracorporeal membrane oxygenation (ECMO) system, which realizes a long-acting antithrombotic function through a bionic interface construction technology. The invention aims to provide a bionic antithrombotic PMP gas-blood exchange membrane based on zwitter-ion gradient grafting, and through material and process innovation, the following problems existing in a traditional ECMO gas-blood exchange membrane: an antithrombotic coating is easy to fall off, and the long-term effect is insufficient; the risk of blood injury caused by dependence on heparin or anticoagulants; and the surface modification process destroys the membrane pore structure and air permeability.

The invention relates to a multifunctional scale inhibition and dispersion agent applied to a reverse osmosis system and a preparation method of the multifunctional scale inhibition and dispersion agent. The multifunctional scale inhibition and dispersion agent comprises the following components in parts by mass: 6-9 parts of CS-GLU, 1.5-2.5 parts of ascorbic acid, 3-4.5 parts of polyaspartic acid, 1-2 parts of sodium gluconate, 2-4 parts of polyethylene glycol, 0.005-0.03 part of nano SiO2, 1-3.5 parts of triammonium citrate, 3-6 parts of acetic acid, 0.2-0.5 part of urea, 1-2.5 parts of EDTA-2Na and 65.47-81.295 parts of deionized water. A traditional scale inhibitor only depends on chemical chelation and has no repair and oxidation resistance. According to the product, chemical scale inhibition and physical repair (film formation and nano filling) are cooperated, and the limitation of a single function is broken through; an anti-oxidation system (ascorbic acid + EDTA) is arranged in the product to replace a dangerous reducing agent, so that the service life of the membrane is prolonged; a traditional scale inhibitor is sensitive to high-valence ions such as Fe < 3 + > and Al < 3 + > and is narrow in applicable water quality range. The charge of the product is adapted to zwitterionic characteristics, and deposition pollution of a traditional anionic scale inhibitor is avoided.

The invention relates to the technical field of oil-displacing agents, in particular to a polyacrylamide-containing oil-displacing agent and a preparation method thereof.The polyacrylamide-containing oil-displacing agent is prepared from, by weight, 35-40% of functionalized polyacrylamide, 5-8% of loading filler, 2-3% of n-amyl alcohol, 5-7% of cyclohexane and the balance water; the polyacrylamide is subjected to functional modification, and the loading filler loaded with the zwitterionic surfactant is added, so that the oil-displacing agent can still keep a good synergistic effect in a complex high-temperature and high-salt environment, and a good oil-displacing characteristic is exerted.

The invention discloses a preparation method of a zwitterionic copolymer ultrafiltration membrane. The preparation method of the zwitterionic copolymer ultrafiltration membrane comprises the following steps: preparing a zwitterionic piperidine monomer; preparing a zwitterionic copolymer; and preparing the zwitterionic ultrafiltration membrane. The zwitterionic copolymer is synthesized by carrying out Friedel-Crafts copolycondensation on terphenyl, a piperidine monomer and a zwitterionic piperidine monomer in a specific proportion. The copolymer has high hydrophilicity and can be directly processed into an ultrafiltration membrane. The ultra-filtration membrane prepared by the preparation method disclosed by the invention is of a compact and interconnected spongy porous structure; the amphoteric ion copolymer membrane prepared by the preparation method can efficiently separate pollutants, shows excellent antifouling performance, can be repeatedly used, solves the problems of poor antifouling capability, low filtering efficiency, short service life and the like of the traditional ultrafiltration membrane, paves a way for directly manufacturing the amphoteric ion copolymer membrane, and provides an effective way for promoting the practical application of the high-performance anti-pollution membrane in a water treatment system.

The invention discloses a stationary phase of a novel zwitterionic monomer containing a multi-charge structure as well as a preparation method and application of the stationary phase, and belongs to the technical field of hydrophilic interaction chromatography (HILIC) stationary phases. According to the method, multi-charge zwitterions are used as hydrophilic monomers, the multi-charge structure of the multi-charge zwitterions endows the monomers with higher hydrophilic performance, and the multi-charge zwitterions are immobilized on the surface of a matrix by utilizing an active free radical polymerization method, so that a series of novel super-hydrophilic HILIC stationary phases are finally prepared. The multi-charge zwitterionic monomer adopted by the invention not only has better hydrophilic performance and higher charge density, but also can efficiently, simply and conveniently realize matrix surface grafting and modification. The developed stationary phase is suitable for HILIC column chromatography separation analysis, and the HILIC chromatographic performance can be greatly improved; the method can also be applied to the fields of biological sample pretreatment, material science, marker clinical diagnosis and the like, and has high economic and social values.

The invention relates to the technical field of oilfield chemistry, and discloses an emulsifier, a response agent, a thick oil viscosity reduction method and application. The emulsifier is prepared from nano aluminum oxide, zwitterionic polyacrylamide and alkyl diethylenetriamine according to the mass ratio of 1 to (0.1 to 3) to (7 to 25); wherein the average particle size of the nano aluminum oxide is 30 to 300 nm. When the emulsifier provided by the invention is used for reducing the viscosity of the heavy oil, a stable emulsion can be obtained in the presence of CO2, quick demulsification can be realized by discharging CO2, the stability and quick response effect can still be kept after multiple cycles, and the emulsifier is particularly suitable for reducing the viscosity of the heavy oil.

The invention relates to the technical field of chemical oil displacement, and particularly discloses a self-emulsifying nano-composite modifying and flooding agent for an oil field and a preparation process of the self-emulsifying nano-composite modifying and flooding agent. The invention relates to a self-emulsifying nano composite modifying and flooding agent for an oil field. The self-emulsifying nano composite modifying and flooding agent is prepared from the following 100 parts by mass of raw materials: 3-5 parts of amphiphilic nano silicon dioxide, 1-2 parts of a zwitterionic surfactant, 0.5-1 part of a nonionic surfactant and the balance of water, the zwitterionic surfactant comprises hydroxyl sulfobetaine and imidazoline, and the zwitterionic surfactant comprises hydroxyl sulfobetaine and imidazoline; and the non-ionic surface active agent is an ethyoxyl-propoxyl block copolymer. The self-emulsifying nano-composite modifying and flooding agent prepared by the invention effectively realizes the balance of low interfacial tension and self-emulsifying efficiency.

The invention belongs to the technical field of flexible energy storage devices, and discloses a flexible wearable solid-state zinc battery based on a poly-zwitter ion hydrogel electrolyte and a preparation method thereof. According to the flexible wearable solid-state zinc battery, a poly-zwitterionic hydrogel electrolyte is used as an electrolyte, a current collector is coated with a zinc powder dispersion liquid to serve as a flexible negative electrode, and the current collector is coated with a vanadium-based or manganese-based material dispersion liquid to serve as a flexible positive electrode. The poly-zwitterionic hydrogel electrolyte is prepared by copolymerizing a zwitterionic monomer, an acrylate monomer, a lithium salt and a photoinitiator and soaking in a zinc salt solution, has the characteristics of good mechanical properties, high ionic conductivity, wide electrochemical window and the like due to the unique structure, and can be applied to special environments such as stretching, curling, bending and the like. The preparation process is simple in route, has excellent electrochemical and mechanical properties, is large in specific capacity, is beneficial to large-scale industrialization, and has a good application prospect in flexible electronic equipment, wearable equipment and skin equipment.

Surfactant compositions comprising a reaction product of a saccharide polymer and a fatty acid or a fatty ester may be obtained in an aqueous fluid in the presence of a hydroxide base and a neutral surfactant or a reaction product form thereof, the saccharide polymer comprising a dextran, a dextrin compound, or any combination thereof. One or more zwitterionic surfactants may be combined with the surfactant composition in a ratio sufficient to render the resulting combined surfactant composition brine-tolerant, even when both the reaction product and one or more of the zwitterionic surfactant(s) are brine-intolerant. The one or more zwitterionic surfactants may be further selected to render the combined surfactant composition non-emulsifying toward oleaginous fluids.

The present invention relates to the field of medical repair materials and particularly to a double-crosslinked hydrogel composite material, a preparation method therefor, and use thereof. The double-crosslinked hydrogel composite material comprises a physical-chemical double-crosslinked copolymer formed by reacting at least one type of acrylic monomer and at least one type of zwitterionic monomer in the presence of nanoparticles and a crosslinking agent. The double-crosslinked hydrogel composite material of the present invention has the characteristics of high mechanical strength, high adhesion strength, and swelling resistance, is low in cost, and features a preparation process that is simple and rapid and easy to regulate. Therefore, the material has very high application value.

The invention discloses a pH-responsive alkaline clean fracturing fluid as well as a preparation method and application thereof, and belongs to the technical field of oil and gas field fracturing. The cleaning agent comprises the following components in parts by mass: 1-5 parts of an anionic surfactant, 1-5 parts of a zwitterionic surfactant, 0.2 part of a pH regulator and 100 parts of deionized water, wherein the anionic surfactant is sodium oleate or sodium stearate; the zwitterionic surfactant is erucyl amide propyl betaine or oleamide propyl betaine; and the surfactant is a surfactant. The pH regulator is any one of sodium hydroxide, potassium hydroxide and sodium bicarbonate. The fracturing fluid is a clean fracturing fluid system based on pH response type micelle dynamic reconstruction, and through the synergistic effect of a specific surfactant and a pH response mechanism, accurate and rapid regulation and control of viscosity, zero residue damage and construction process simplification are achieved; the technical problems that an existing surfactant fracturing fluid is complex in compounding process, cannot be recycled after gel breaking, is slow in gel breaking response and narrow in application range are solved.

The invention discloses a high-performance anti-pollution zwitter-ion nanofiltration membrane and a preparation method and application thereof, the method comprises the following steps: S1, immersing a support base membrane in deionized water, and then adhering the support base membrane to the bottom of a glass plate; s2, soaking the supporting base membrane in an inorganic phase solution, and then drying until no obvious water drops exist on the surface; s3, the supporting base membrane is soaked in an organic phase solution, a thin polyamide layer is formed on the surface of the supporting base membrane, then heat treatment is carried out, and the organic phase solution comprises multiple acyl chloride monomers and a solvent; s4, soaking the membrane prepared in the step S3 in a grafting solution for surface grafting, and then performing heat treatment to obtain the high-performance anti-pollution zwitter-ion nanofiltration membrane. Through a synergistic modification strategy, the microstructure and surface properties of the nanofiltration membrane are optimized, and the properties of the traditional nanofiltration membrane are improved.

The application discloses an intrinsic antifouling coating composition based on furan dioxime antibacterial cross-linking agent and application. The intrinsic antifouling coating composition comprises an A component and a B component, the A component comprises a zwitterionic modified hydroxyl silicone oil, and the B component comprises a furan dioxime antibacterial cross-linking agent. After forming a coating, the organic silicon segment, the zwitterionic segment and the furan dioxime segment in the intrinsic antifouling coating composition can respectively endow the coating with dynamic antifouling performance, static antifouling performance and sterilization performance, meanwhile, the coating composition realizes intrinsic triple antifouling without any antifouling agent and related fillers, and is suitable for efficient antifouling of the surface of marine equipment.

The application discloses a kind of salt ion exchange membrane for electrodialysis and preparation method thereof, cation exchange membrane is immersed in the buffer containing tannic acid and zwitterion diamine monomer, reaction is carried out at 0~60 ℃ for 0.5~60 h, obtain salt ion exchange membrane for electrodialysis.The application is formed by the Michael addition or Schiff base reaction between tannic acid molecule and zwitterion diamine monomer under weak alkaline condition, uniform, stable tannic acid / diamine zwitterion ultrathin coating is formed on the surface of cation exchange membrane.The application significantly improves Li + / Mg 2+ Selectivity. Preparation process is simple, environmental protection, strong universality, the modified cation exchange membrane prepared by the application has excellent Li + / Mg 2+ Selectivity, and can improve the anti-pollution of membrane, can be used for high magnesium lithium ratio brine electrodialysis method lithium extraction.

Provided herein are compounds, or salts, esters, tautomers, prodrugs, zwitterionic forms, or stereoisomers thereof, as well as pharmaceutical compositions comprising the same. Also provided herein are methods of using the same in modulating (e g., inhibiting) KRAS (e.g., KRAS having a G12D mutation) and treating diseases or disorders such as cancers in subjects in need thereof.

The invention discloses a super-tensile strong-adhesion quasi-dual-network conductive hydrogel as well as a preparation method and application thereof. The super-tensile strong-adhesion quasi-dual-network conductive hydrogel is characterized in that a zwitterionic monomer and a hydrophilic monomer are polymerized to form a first phase domain, a conductive polymer is used as a second phase domain, the second phase domain is semi-interpenetrated in the first phase domain in a coil / micelle state, and meanwhile, a second ionic cross-linked network is formed; and the second ionic cross-linked network accounts for 3.3 to 33.3 wt% of the quasi-dual-network conductive hydrogel network. According to the quasi-dual-network conductive hydrogel provided by the invention, under the condition of no additional conductive filler or high salt, through an ion bridge-hydrogen bond synergetic quasi-dual-network structure, consideration of high water content, super-large stretching and stable electrical response is realized at the same time.

The application discloses a sensor with a bionic olfactory positioning function, comprising a gate electrode, a dielectric layer and an electrode; the dielectric layer is arranged between the gate electrode and the electrode; and the dielectric layer comprises a porous structure zwitterionic polymer film. Through the combination of the high sensitivity of the sensor to dimethyl carbonate (DMC) and the application method, accurate positioning of a DMC leakage position is realized, and meanwhile, the sensor has the characteristics of high sensitivity, durability and excellent intelligent bionic positioning, and overcomes the positioning function that traditional sensors do not have.

The invention discloses a near-infrared absorption zwitter-ion ethylene-linked covalent organic framework photocatalyst as well as a preparation method and application thereof, and the preparation method comprises the following steps: carrying out hydrothermal reaction on a mixture of an N-(3-sulfopropyl)-2, 4, 6-(trimethyl) pyridine monomer, an aldehyde monomer containing a thiophene unit, organic alkali and water to obtain the near-infrared absorption zwitter-ion ethylene-linked covalent organic framework photocatalyst. The zwitterionic ethylene-linked covalent organic framework photocatalyst ZVCOFs with near-infrared absorption is obtained. According to the method, a one-step green hydrothermal method is adopted, water is used as a solvent, pollution to the environment is reduced, traditional tedious freezing-pumping-unfreezing operation is omitted, high-yield COFs are obtained, and the method has the potential of industrial amplification. The ZVCOFs show excellent hydrophilicity due to rich zwitterionic groups and thiophene units, the light absorption range can be expanded to a near-infrared light region, the light absorption band edge reaches up to 852-1230 nm, and the ZVCOFs have excellent hydrogen evolution performance of photocatalytic water decomposition.