1831 results about "Covalent organic framework" patented technology

The invention discloses a cobalt-loaded covalent organic framework material as well as a preparation method and application thereof, and belongs to the technical field of catalyst preparation. The cobalt-loaded covalent organic framework material is prepared by taking a carbonized covalent organic framework as a matrix and cobalt nitrate hexahydrate as a cobalt source, reducing by using a sodium borohydride methanol solution, and introducing transition metal cobalt into the framework through room-temperature impregnation and thermal reduction processes. In the material, active components comprise Co0 and Co < 2 + > which are uniformly distributed on a carrier. Moreover, the metal cobalt is stably loaded in a carbon skeleton through the bonding effect of heteroatoms such as nitrogen and carbon, so that the stability, the catalytic activity and the durability of the metal cobalt are effectively improved, the dissolution risk of the metal cobalt is reduced, the hidden danger of environmental pollution is reduced, and efficient catalytic activity is shown in the aspect of catalyzing and activating peroxymonosulfate to degrade organic pollutants; and good recycling stability is achieved.

The invention discloses a polyrotaxane covalent organic framework material capable of regulating interlayer spacing through cyclodextrin and application of the polyrotaxane covalent organic framework material, and belongs to the technical field of biological medicine. The polyrotaalkylated covalent organic framework material is obtained by taking a cyclodextrin aromatic multi-amino inclusion compound and a (multi-aldehyde bipyridine) ruthenium (II) complex as structural units and carrying out copolymerization; the cyclodextrin aromatic polyamine inclusion compound is a beta-cyclodextrin p-phenylenediamine inclusion compound with a hydroxyl group or without a hydroxyl group; the (multi-aldehyde dipyridyl) ruthenium (II) complex is tris (4, 4 '-diformaldehyde-2, 2'-dipyridyl) ruthenium (II). The interlayer spacing of the polyrotaxane covalent organic framework material is greatly increased by utilizing a cavity of gamma-cyclodextrin, and meanwhile, the material has excellent photo-thermal and photodynamic activity, is positively charged, and can better adsorb negatively charged bacteria; and the hydrogel is good in biocompatibility and free of toxic and side effects, and has an excellent treatment effect on wounds infected with staphylococcus aureus.

The invention provides a redox imidazole covalent organic framework material as well as a preparation method and application thereof, belongs to the technical field of material preparation and photocatalytic preparation of hydrogen peroxide, and aims to solve the technical problem of low activity of a current covalent organic framework in preparation of hydrogen peroxide. The preparation method of the imidazole-connected redox type imidazole covalent organic framework material comprises the following steps: respectively reacting a reactant 2, 7-di-tert-butylpyrene-4, 5, 9, 10-tetraketone monomer with 4, 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ' The preparation method comprises the following steps: mixing 4, 4 '-(pyridine-2, 4, 6-triyl) tribenzaldehyde and a tri (4-formylphenyl) amine monomer, adding a solvent and a catalyst, uniformly stirring, and reacting to obtain the redox type imidazole covalent organic framework material after the reaction is finished. The application comprises the following steps: adding the covalent organic framework, oxygen and the sacrificial agent into water, and reacting under the irradiation of visible light. The preparation method is green, environment-friendly, simple and easy to implement, the prepared material has good thermal stability, and efficient visible light photocatalysis preparation of hydrogen peroxide can be achieved; meanwhile, the catalyst can be recycled and has good photocatalytic stability.

The invention relates to a crown ether covalent organic framework material as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving a crown ether monomer and an amino monomer in an o-dichlorobenzene solvent, adding a catalyst acetic acid aqueous solution, and uniformly dispersing to form a reaction solution; the method comprises the following steps: freezing a reaction solution through a liquid nitrogen bath, vacuumizing, filling nitrogen, carrying out a heating reaction, and carrying out post-treatment operations such as washing and drying on a reaction product, so as to obtain the crown ether covalent organic framework material BADT-DB18C6-COF. The crown ether covalent organic framework material is formed by condensation of a crown ether aldehyde monomer and an amino monomer, the crown ether monomer is 4, 4 ', 4' ', 4 '''-(6, 7, 9, 10, 17, 18, 20, 21-octahydrodibenzo [B, K] [1, 4, 7, 10, 13, 16] hexaoxacyclo octadecene-2, 3, 13, 14-tetrayl) tetrabenzaldehyde, and the crown ether monomer is 4, 4 ', 4' ', 4'''-(6, 7, 9, 10, 17, 18, 20, 21-octahydrodibenzo [B, K] [1, 4, 7, 10, 13, 16] hexaoxacyclo octadecene-2, 3, 13, 14-tetrayl) tetrabenzaldehyde. The amino monomer is 4 ', 5'-bis (4-aminophenyl)-[1, 1 ': 2', 1 ''-terphenyl]-4, 4''-diamine. The crown ether covalent organic framework material BADT-DB18C6-COF prepared by the invention is mainly used as an adsorbent, is used for adsorbing and recovering uranium, thorium and americium ions from a solution, shows good adsorption capacity on radionuclides U-238, Th-232 and Am-243, and is particularly suitable for the field of spent fuel post-treatment in the nuclear industry.

The invention belongs to the technical field of organic photoelectric materials, and particularly relates to preparation and application of a benzoselenadiazole covalent organic framework material. According to the invention, benzoselenadiazolyl tetraaldehyde is used as a construction unit, o-toluidine, 4, 4 '-biphenyl diamine or 3, 3'-dihydroxybenzidine is used as a connecting body, and three kinds of novel rigid COFs, namely HBU-COF-CH3, HBU-COF-H and HBU-COF-OH, are synthesized in sequence. The COFs has high cycling stability, has outstanding advantages in the aspect of sustainable heterogeneity of molecular catalysts, and can be used as a heterogeneous photocatalyst to realize efficient hydrogen peroxide production under visible light, and the photocatalytic hydrogen peroxide production performance of the COFs is superior to that of most reported COFs materials. Wherein the yields of HBU-COF-CH3, HBU-COF-H and HBU-COF-OH are as high as 12910 [mu] mol g <-1 > h <-1 >, 8838 [mu] mol g <-1 > h <-1 > and 7679 [mu] mol g <-1 > h <-1 > in sequence.

The invention provides a preparation method of an hourglass type covalent organic framework (COF) composite membrane, and belongs to the field of gas membrane separation. According to the method, covalent organic framework nanosheets with different pore diameters and charge characteristics are utilized to construct the COF composite membrane with a unique hourglass structure through a vacuum-assisted layer-by-layer assembly technology, so that precise regulation and control on H2 and CO2 gas transmission behaviors are realized, and the prepared composite membrane shows remarkable H2 / CO2 separation selectivity and high permeation flux, and has a good application prospect. The chemical stability, the thermal stability and the mechanical flexibility are excellent. The invention provides a novel solution for efficient gas separation and energy storage application.

The invention discloses a porphyrin-based covalent organic framework nano material, a preparation method and application of the porphyrin-based covalent organic framework nano material in polyurethane, and belongs to the field of functional nano materials and antibacterial materials. The porphyrinyl covalent organic framework nano material is prepared from 5, 10, 15, 20-tetra (4-aminophenyl) porphyrin and bis-(5-formyl furfuryl) ether through a Schiff base reaction, and the structural formula of the porphyrinyl covalent organic framework nano material is # imgabs0. The porphyrinyl covalent organic framework nano material prepared by the invention has relatively high photothermal conversion efficiency when being used as a photothermal agent, and has a relatively good sterilization effect under the condition of relatively low concentration. Besides, based on the porphyrin-based covalent organic framework nano material, a WPUS / Por-COF composite film is prepared, the composite film has excellent mechanical properties and excellent photothermal conversion efficiency, and has a good sterilization effect under the condition of relatively low concentration, bacteria can be inactivated within a short time, and the sterilization rate can reach 99% or above.

The invention relates to preparation of a covalent organic framework material (COF) containing methyl and thiophene and application of the covalent organic framework material in production of hydrogen peroxide. Two thienyl covalent organic framework materials are prepared respectively, and the problem that the yield of hydrogen peroxide produced through photocatalysis of an existing covalent organic framework material is not high is solved. A solvothermal method is adopted for preparation, the preparation process is simple and efficient, the solvent consumption is low, the method is green and environmentally friendly, the yield is high, the problem that the energy utilization efficiency is too low due to mutual compounding of photon-generated carriers and electrons in the photocatalysis process is solved, and the efficiency of photocatalytic production of hydrogen peroxide is effectively improved. The BTTPa-2COF is applied to photocatalytic production of hydrogen peroxide, experimental results show that the BTTPa-2COF has excellent performance of photocatalytic production of hydrogen peroxide, and the performance of hydrogen peroxide production can reach 3680 [mu] molg <-1 > h <-1 > under visible light irradiation.

β-Ketoenamine covalent organic frameworks (COFs) provide remarkable water sorption capabilities and stable adsorption–desorption cycling, particularly under low relative humidity (RH) conditions.

The invention discloses a self-response odor-removing and sterilizing material, a preparation method thereof and a refrigerator, and belongs to the technical field of refrigerator adsorption materials. Comprising main materials and auxiliary materials, the main body material is composed of an adsorption material and a formaldehyde removal agent; the auxiliary material is composed of a response material and a bactericide; the response material is selected from a covalent organic framework; the bactericide is selected from benzimidazole compounds; the benzimidazole compound shows a deprotonation trend when the pH value is any one value of 2.8-7.1, and is combined with the covalent organic framework through electrostatic attraction; when the pH value is less than 2.8, the benzimidazole compound and the covalent organic framework are protonated at the same time, and the benzimidazole compound is released. The sterilization material is applied to the refrigerator sterilization aspect, and the problems that the sterilization effect is not lasting due to the fact that a common odor-removing sterilization material plays a role to release sterilization substances from the beginning of application, or the sterilization material cannot be actively released, the sterilization effect can be achieved only when bacteria are adsorbed on the surface of the sterilization material, and the bacteria in the air cannot be killed are solved.

The invention belongs to the technical field of membrane separation, and aims to provide a preparation method and application of a covalent organic framework bipolar membrane. The method comprises the following steps: combining at least one amine, hydrazide or aldehyde monomer containing ionic groups with a monomer without ionic groups, and respectively synthesizing covalent organic framework COF nanosheets with positive charges and negative charges through a one-pot method under the condition of coexistence of an acid catalyst and an organic solvent; sequentially depositing COF nanosheets with positive and negative charges on the surface of the porous carrier by a hot solvent evaporation method; by constructing two COF separation layers with regular pore channels and opposite electrical properties, the covalent organic framework bipolar membrane with charge asymmetry is finally obtained. The product provided by the invention has high selectivity, can realize efficient separation of protons and metal cations, and significantly improves the extraction and recovery purity of hydrochloric acid; through charge repulsion and pore size screening mechanisms, separation of different anions can be further realized, and selective recovery of acid molecules is enhanced.

The invention relates to a preparation method of a nanofiltration membrane containing a covalent organic framework (COF) interlayer. The nanofiltration membrane (NF) comprises a base membrane, an interlayer and a separation surface layer. The interlayer is formed by in-situ growth of polyphenol and diamine under the action of an oxidizing agent, and the separation surface layer is formed by an aqueous-phase active monomer and multi-element acyl chloride through an interfacial polymerization reaction. According to the invention, an imino covalent organic framework (TpPa-COF) film interlayer is introduced, and a surface polyamide layer is prepared through interfacial polymerization, so that the hydrophilicity of the film and the ability of removing divalent cations are improved. The invention aims to solve the problem of balance between low flux and high separation effect of an NF membrane in separation of monovalent / divalent cations, maintain ideal water flux while ensuring high separation effect, and solve the problem that a traditional NF membrane separation layer has defects. The two-dimensional TpPa-COF material can effectively control the pore size distribution and hydrophilicity of the surface of the substrate and improve the separation performance of the composite membrane. The preparation method is simple, and the obtained nanofiltration membrane has a wide application prospect.

The invention relates to the technical field of secondary batteries, and provides a secondary battery and a preparation method thereof, an energy storage system and electric equipment, the secondary battery comprises a shell, an electrolyte and a battery cell assembly, the shell is provided with an accommodating space for accommodating the electrolyte and the battery cell assembly, the battery cell assembly is at least partially immersed in the electrolyte, and the shell is provided with a battery cell. The battery cell assembly comprises a positive pole piece, a negative pole piece and a diaphragm; the diaphragm is positioned between the positive pole piece and the negative pole piece; the liquid storage layer comprises a flexible porous framework, the flexible porous framework is provided with a plurality of pore channels, and the flexible porous framework comprises one of an organic metal framework, a covalent organic framework and a hydrogen bond organic framework; the pore channel has a first state and a second state, the pore channel deforms and changes from the first state to the second state under set conditions, in the process, the electrolyte flows out of the pore channel of the liquid storage layer, and the volume of the electrolyte contained in the pore channel in the second state is smaller than that of the electrolyte contained in the pore channel in the first state.

The invention provides a preparation method of an environment-friendly high-performance gas barrier film, which is characterized in that a solution blending method is adopted to prepare a polyvinyl alcohol / nanocellulose / covalent organic framework nanosheet ternary composite system, and a coating method is adopted to prepare the high-performance gas barrier film under high-temperature evaporation. Multidimensional mixed nanocellulose and covalent organic framework nanosheets are introduced as functional fillers to form a stable intercalation structure with a polyvinyl alcohol matrix, so that the interfacial compatibility of the components is remarkably improved. The multi-component gas barrier film is endowed with high humidity resistance, chemical stability, high gas barrier property and the like by regulating and controlling the heat treatment temperature, the environment-friendly gas barrier film material shows good application prospects in the fields of chemical protective clothing and the like, and a new thought is provided for development of high-performance protective materials.

The invention discloses a preparation method and application of a chiral aldehyde amine condensation covalent organic framework material, through an ultrasonic chemical synthesis method, the synthesis cost and energy consumption are remarkably reduced, the reaction time is shortened, and the chiral transmission efficiency and the crystallinity of the material are greatly improved; the synthesis method disclosed by the invention not only has the characteristics of high efficiency and environmental protection, but also provides a brand new technical means for preparing a high-performance chiral two-dimensional COF material with a controllable structure; according to the preparation method, the preparation of the chiral two-dimensional COF material is more efficient and stable, and the chiral two-dimensional COF material has high repeatability and controllability, is suitable for being widely applied to various technical fields needing high-chiral materials, and further promotes the development of the chiral materials in scientific research and industrial application.

The invention provides a covalent organic framework material as well as a preparation method and application thereof, and belongs to the technical field of covalent organic framework materials. The method provided by the invention comprises the following steps: mixing 2, 4, 6-triformyl phloroglucinol, multi-element aromatic amine and a polar organic solvent, and sequentially carrying out Schiff base reaction and precipitation to obtain a crude product; the ratio of the volume of the polar organic solvent to the mass of the 2, 4, 6-triformyl phloroglucinol is 300 to 500 mL / g; and sequentially washing and drying the crude product to obtain the covalent organic framework material. The method provided by the invention does not need to be operated under an anhydrous condition, the 2, 4, 6-triformyl phloroglucinol does not need to be completely dissolved in a reaction system, the use amount of an organic solvent can be remarkably reduced, a good reaction effect can be achieved without anhydrous and anaerobic tube sealing, and the method is suitable for large-scale production.

The invention is applicable to the technical field of intelligent response materials, and provides a three-dimensional azobenzene functionalized covalent organic framework intelligent response material and a preparation method thereof. The three-dimensional azobenzene functionalized covalent organic framework intelligent response material is prepared by uniformly grinding 3, 3 ', 5'-tetra [(3 ', 5'-diformylphenyl)]-hexamethyl biphenyl and azobenzene-4, 4 '-diaminotriphenylamine, adding an organic solvent, adding a catalyst acetic acid aqueous solution, quickly freezing, emptying air, sealing with flame, heating after recovering to room temperature, and obtaining the three-dimensional azobenzene functionalized covalent organic framework intelligent response material. According to the invention, the azobenzene functionalized covalent organic framework material with a bcu topological structure is synthesized; the material has excellent photostimulation response CO2 adsorption performance; reversible control of CO2 adsorption capacity can be realized through ultraviolet light and heating conditions, at least five times of circulation can be maintained, and good circulation stability is achieved.

The invention relates to a covalent organic framework / melamine-based sponge composite material as well as a preparation method and application thereof. The covalent organic framework / melamine-based sponge composite material comprises melamine sponge and a covalent organic framework material, the covalent organic framework material is prepared by reacting an amino monomer with an aldehyde group monomer; the aldehyde group monomer is an aldehyde group monomer containing hydroxyl. The composite material based on the covalent organic framework / melamine sponge combines the excellent hydrophobicity of the covalent organic framework and the high porosity of the melamine sponge, so that the composite material has extremely high adsorption capacity on oil, repels moisture, has an excellent oil-water separation effect and can realize efficient oil-water separation.

The invention discloses a preparation method of a bio-based epoxy resin anticorrosive coating, and relates to a preparation method of a bio-based epoxy resin coating. The bio-based epoxy resin anticorrosive paint mainly comprises an anticorrosive filler COFs-AA, bio-based epoxy resin and a curing agent. Wherein the anticorrosive filler COFs-AA is prepared from a two-dimensional covalent organic framework COFs and a bio-based material arachidonic acid (AA) through a covalent condensation reaction; the bio-based epoxy resin is prepared by epoxidizing a bio-based material galangin serving as a raw material through epichlorohydrin, and the curing agent is a common curing agent for epoxy resin. The bio-based epoxy resin anticorrosive paint is compounded by taking biomass as a basic component, and has the characteristics of greenness, environmental protection, no toxicity, good hydrophobicity and good corrosion resistance; the bio-based epoxy resin anticorrosive paint can be applied to the field of corrosion protection of materials such as various metals and woodware.

The present invention relates to a novel method for synthesizing olefin covalent organic framework foams, and polyimide, imine, hydrazone or Ketoenamine covalent organic frameworks (COFs). The method is a green synthetic strategy, including: under non-solvent condition, performing condensation reaction of a methyl-containing monomer and an aldehyde monomer with participation of acid anhydride or carboxylic acid compound to prepare olefin COFs; performing condensation reaction of a multihead acid anhydride or a multihead carboxylic acid monomer and an amino monomer with participation of acid anhydride or carboxylic acid compound to prepare amide COFs; and performing condensation reaction of the aldehyde monomer and the amino monomer with participation of acid anhydride, imidazole or carboxylic acid compound to prepare imine COFs. The COFs obtained by using the method have large specific surface area, regular and adjustable porous structure, and high crystallinity. The method effectively avoids use of organic solvent and risk of high pressure in the reaction process, and is suitable for large-scale preparation of COF materials.

The invention discloses preparation and application of an imido covalent organic framework material containing imidazolyl ionic liquid. The imido covalent organic framework material (ILs-TPN-COFs) containing the imidazolyl ionic liquid is obtained by connecting the imidazolyl ionic liquid [CnCmILs (at) Br] to an imido covalent organic framework TPN-COFs through a covalent bond. The material has an ionic liquid tertiary amine N active site and a halogen anion active site, and can promote CO2 activation and ring opening of epoxide. The ILs-TPN-COFs catalytic material has the advantages of uniform distribution of active sites, better stability, easiness in separation of the catalyst from a reaction system, better repeatability and the like. According to the invention, the prepared novel ILs-TPN-COFs material is applied to catalysis of synthesis of propylene carbonate from carbon dioxide and epoxypropane, and shows excellent catalytic performance under mild reaction conditions.

The invention belongs to the field of cation exchange membranes, and discloses a monovalent selective cation exchange membrane with crown ether encapsulated in the membrane and a preparation method of the monovalent selective cation exchange membrane. Firstly, a sulfonated chloromethylated polymer is synthesized, a solvent is evaporated to form a membrane, and a chemical reaction of chloromethyl and amido contained in the membrane endows a growth site of a covalent organic framework. And then constructing a covalent organic framework in a membrane channel by an in-situ growth method, and packaging the crown ether nano material in the membrane. A regular porous channel of the covalent organic framework and a sulfonic acid group in the base membrane have a synergistic effect, so that good ion flux of monovalent ions is ensured. Meanwhile, the crown ether structure has a special recognition complexing effect on alkali metal ions and has different affinity to different metal ions, so that the monovalent cation selective separation is achieved, and the prepared monovalent selective cation exchange membrane is suitable for an electrodialysis process.

A method of making a covalent organic framework includes continuously feeding a first precursor and a second precursor to a flow reactor; heating, and mixing the first and second precursors; nucleating and growing the covalent organic framework; and continuously outputting the covalent organic framework from the third section of the flow reactor. A photo-reactor for treating contaminated water includes: a light source; an enclosed channel around the light source; a cover comprising one or more lights illuminating the enclosed channel; and a covalent organic framework cased within the enclosed channel, where the covalent organic framework is photo-catalytically active for degrading a contaminant in the contaminated water so as to produce treated water. A method of treating contaminated water includes feeding the contaminated water to the photo-reactor and contacting the contaminated water with the covalent organic framework.

The invention discloses a covalent organic framework membrane and a preparation method thereof, and belongs to the technical field of organic porous materials and membrane materials. The preparation method of the covalent organic framework membrane comprises the following steps: S1, respectively dissolving an amine compound containing a plurality of amino groups and a compound containing a plurality of aldehyde groups in a mixed solution of trifluoroacetic acid and water to respectively obtain a first monomer solution and a second monomer solution; in the mixed solution, the volume ratio of trifluoroacetic acid to water is (95-96): (4-5); s2, mixing the first monomer solution and the second monomer solution, and performing ultrasonic treatment to obtain a reaction solution; and heating the reaction liquid at 95-100 DEG C to react for 3-5 minutes to form the covalent organic framework film. In addition, the invention also provides the covalent organic framework film which is prepared by the preparation method. The COF film which is complete in structure, excellent in crystallinity and flexible can be prepared in a short time through a simple method.

The invention relates to an alkynyl-modified acyl covalent organic framework (COF) material and application thereof, and relates to the field of preparation of crystalline porous materials and fuel cells. The material is a covalent organic framework material which is synthesized by taking 1, 3, 5-triformyl phloroglucinol and 2, 5-bis (2-propynyloxy) terephthaloyl hydrazine as raw materials through solvothermal reaction under specific conditions, and has relatively high crystallinity. The material has good performance in the aspect of proton conductivity, the highest proton conductivity can reach 6.16163 * 10 <-4 > S / cm, and the mechanical property is enhanced due to introduction of alkynyl. Alkynyl is used as an active functional group, and various chemical reactions can be derived, so that the potential application value of the material is greatly improved.

The invention provides a sidewalk antiskid terrace material and a construction process thereof, and belongs to the technical field of terrace material manufacturing. The sidewalk antiskid terrace material is prepared from the following components: epoxy resin, polysiloxane elastic resin, fluorocarbon resin, modified covalent organic framework nanosheets, boron nitride nanotubes, nano silicon nitride particles, nano silicon dioxide, nano zinc oxide, a modified flame retardant, attapulgite, a curing agent, an accelerant, a flatting agent, a coupling agent and a dispersing agent. According to the sidewalk antiskid terrace material, various high-performance resins are compounded with the nano filler to form a coating with a compact and uniform structure, so that the mechanical strength and wear resistance of the terrace are remarkably improved. In addition, due to the application of the modified flame retardant, the floor has a good flame-retardant effect, and the safety is improved. The whole formula and the construction process are scientific and reasonable, strong adhesion of the coating is ensured, construction is simple and convenient, curing is sufficient, and the coating is suitable for long-term use of outdoor sidewalks and has attractive appearance and practicability.

The invention discloses a coated reflecting film based on an organic fluorescent coating and a preparation method of the coated reflecting film, tetra (4-aminophenyl) methane and tetra-(4-formyl-(1, 1-biphenyl)) ethylene are used as reaction monomers to prepare a novel topological structure [4 + 4] COF (3D-TPE-COF) with a tetraphenylethylene (TPE) unit, and the novel topological structure [4 + 4] COF (3D-TPE-COF) is used for preparing the reflective film based on the organic fluorescent coating. The covalent organic framework material 3D-TPE-COF is added into coating liquid as a fluorescent material to prepare a coating reflecting film based on an organic fluorescent coating, and the obtained reflecting film can convert high-energy blue light, so that the brightness of light emitted by a backlight module is higher and closer to white; meanwhile, the 3D-TPE-COF fluorescent material and the polymer particles can form hydrogen bonds in the coating liquid to avoid aggregation of the polymer particles, so that the wear resistance and scratch resistance of the coating reflecting film are improved.

The invention relates to a preparation method and application of a covalent organic framework material capable of adsorbing sulfonamide antibiotics. The method comprises the following steps: S1, respectively putting an amino-containing monomer and an aldehyde-containing monomer into a glass tube to obtain a mixture, then adding a solvent, performing ultrasonic uniform mixing, then adding an acetic acid solution for catalytic reaction, and performing uniform mixing to obtain a mixed solution; s2, freezing the mixed solution with liquid nitrogen, then circularly vacuumizing, sealing a glass tube, drying after treatment, cooling to room temperature, and filtering and washing to obtain a precipitate; and S3, carrying out Soxhlet extraction, repeatedly washing, and putting into a vacuum oven to obtain a product, namely the covalent organic framework material capable of adsorbing the sulfonamide antibiotics. According to the application, the adsorbent is applied to adsorption of sulfonamide antibiotics in water. The novel covalent organic framework material prepared by the invention is used for removing low-concentration sulfonamide antibiotics for the first time, and is considered as an excellent adsorption material capable of reducing the risk of water quality and guaranteeing the health of water quality.

The invention relates to a heterojunction composite material and a preparation method and application thereof, and belongs to the technical field of catalysts. The preparation method of the heterojunction composite material comprises the following steps: dispersing nano cadmium sulfide in water to obtain a nano cadmium sulfide dispersion liquid, then adding a triazinyl covalent organic framework, fully reacting at 75-85 DEG C, centrifuging, precipitating, washing and drying to obtain the heterojunction composite material. The narrow-band-gap semiconductor cadmium sulfide and the wide-band-gap semiconductor triazinyl covalent organic framework are compounded to form the heterojunction structure composite material photocatalyst, and the narrow-band-gap semiconductor cadmium sulfide and the wide-band-gap semiconductor triazinyl covalent organic framework interact with each other, so that the response range of sunlight is widened, separation and transfer of photo-induced electrons and holes are promoted, and the photoelectric conversion efficiency is improved. Therefore, the photocatalytic oxidation-reduction capacity of the catalyst is improved, and the photocatalytic performance of the catalyst is finally improved. The heterojunction composite material can be applied to the field of cleaning and environmental protection as a photocatalyst, and has excellent hydrogen production efficiency.

The invention relates to a preparation method of a spiral dislocation stacked imine covalent organic framework material. The preparation method comprises the steps of preparing an imine covalent oligomer and preparing the spiral dislocation stacked imine covalent organic framework material. The invention also provides the spiral dislocation accumulation imine covalent organic framework material obtained by the preparation method and application of the spiral dislocation accumulation imine covalent organic framework material in light absorption semiconductor materials. The preparation method provided by the invention is simple, convenient, universal and easy to implement, and the imine covalent organic framework material with the spiral dislocation stacking structure is obtained, is clear in material structure and good in crystallinity, is a novel topological structure, and has a good potential application prospect in the photoelectric field.