2264 results about "Covalent organic framework" patented technology

The invention belongs to the technical field of separation membrane materials, and provides a covalent organic framework membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing an organic phase solution containing a polyaldehyde monomer and a water phase solution containing a polyamine monomer; dropwise adding the organic phase solution to the aqueous phase solution for reaction, and dialyzing the solution after the reaction is finished to obtain a purified aqueous dispersion of the covalent organic framework nanosheet; and dispersing the aqueous dispersion, carrying out suction filtration to a hydrophilic support, and carrying out heat treatment and curing. The invention also discloses the covalent organic framework membrane prepared according to the method and application thereof. The covalent organic framework membrane is used for removing divalent ions in a saline solution. The covalent organic framework membrane disclosed by the invention has an ordered pore structure with a specific size and high ion selectivity; due to the strong covalent bond connection characteristic, the covalent organic framework film is endowed with acid and alkali resistance and high stability; the preparation method disclosed by the invention is simple, mild in condition and wide in application range.

Disclosed in the present invention is a graphene oxide / covalent organic framework nanofiltration membrane. The nanofiltration membrane is prepared by mixing a graphene oxide nanosheet dispersion liquid and an imine covalent organic framework nanosheet dispersion liquid, and performing ultrasonic treatment, suction filtration and heat treatment. Further disclosed are a preparation method for the nanofiltration membrane and a use thereof. According to the present invention, a polymer film is used as a support layer, a covalent organic framework and graphene oxide are loaded on the support layer by means of vacuum filtration, and a cross-linked graphene / covalent organic framework nanofiltration membrane is prepared by a thermal crosslinking reaction after drying. The method involves simple and convenient operations and ingenious design, and the obtained membrane has excellent separation performance. By means of covalent bond crosslinking between the graphene oxide and the covalent organic framework, the structure of the membrane is more compact, thereby increasing the retention rate of the membrane for sodium sulfate and sodium chloride. In addition, covalent organic framework nanosheets provide straight channels for the nanofiltration membrane, thereby significantly improving the water permeability of the nanofiltration membrane.

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 belongs to the technical field of pervaporation membrane preparation and application, and relates to a covalent organic framework pervaporation hybrid membrane with a combination sequence regulation interlayer structure, in particular to preparation of the pervaporation membrane and application of the pervaporation membrane in water / butanol separation. Adding the aldehyde monomer solution into the amino monomer solution, and standing for reaction; taking a water phase, and carrying out dialysis treatment; diluting the covalent organic framework nanosheet dispersion liquid to obtain dispersion liquid A; adjusting the pH of a polyelectrolyte aqueous solution to obtain a solution B; adjusting the pH value of the metal ion dispersion liquid to obtain a solution C; uniformly mixing the dispersion liquid A and the solution C at normal temperature, adding the solution B, and heating for reaction to obtain a membrane casting liquid; and carrying out suction filtration on the membrane casting solution to a base membrane, and carrying out vacuum drying to obtain the pervaporation membrane. At 70 DEG C, the separation flux of a 10wt% / 90wt% water / butanol mixture is 7.52 g / (m < 2 > h), and the separation factor reaches 13709.

The invention discloses an acylhydrazone bond-linked three-component covalent organic framework material and application thereof in photocatalytic full-decomposition of water. The three-component COFs expands the designability of the structure and function of the porous organic material by generating ordered anisotropic tiling and ordered pores with abnormal shapes. In addition, COFs connected through acylhydrazone bonds have good thermal stability and chemical stability, and nitrogen atoms on the acylhydrazone bonds can provide a large number of sites for load metal. According to the invention, two electron-deficient and electron-rich nodes are introduced into a COFs framework to form a donor-pi-acceptor structure motif, and Pt metal nanoparticles are loaded onto a three-component covalent organic framework material by using a NaBH4 reduction method. The material has great potential in the aspect of producing H2 and H2O2 through photocatalytic full decomposition of water by taking water as a reactant while solar energy is utilized and a sacrificial agent is not added.

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 discloses a porphyrin copper ion covalent organic framework material with excellent biocompatibility, and belongs to the technical field of biological medicines. The porphyrin copper ion covalent organic framework material is obtained by carrying out solvothermal reaction copolymerization on a porphyrin compound and a novel copper Schiff base boric acid complex in a protective atmosphere; the porphyrin compound is 5, 10, 15, 20-tetra (3, 4-dihydroxyphenyl) porphyrin, and the structural formula of the porphyrin compound is shown in the specification. The structural formula of the novel copper Schiff base boric acid complex is # imgabs0 #. According to the invention, a novel copper Schiff base complex and 5, 10, 15, 20-tetra (3, 4-dihydroxyphenyl) porphyrin are copolymerized to obtain Cu-COF with negligible biotoxicity, and the material realizes the synergistic effect of three antibacterial modes of PDT, PTT and hydroxyl free radicals. The prepared Cu-COF can also be slowly degraded in an acid environment, the infected microenvironment is improved in the degradation process, and the antibacterial effect is improved.

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 phosphazene covalent organic framework (COF) is a material with high efficiency to improve the removal of iodine from nuclear waste. The COF can be obtained by a solvothermal reaction of hexa(4-formyl-phenoxy)cyclotriphosphazene and 1,3,6,8-tetra(aminophenyl)pyrene. The resulting three-dimensional phosphazene COF has iodine uptakes as high as 9.4 g g−1 due to its 3D framework with higher specific surface areas and interconnected channels.

The invention discloses a Br-COFs material and a preparation method thereof as well as a preparation method of a covalent organic framework material interface film of a lithium metal battery. The preparation method comprises the following steps: dissolving 1, 3, 5-tri (4-aminophenyl) benzene and 2, 5-dibromobenzene-1, 4-dicarboxaldehyde in an organic solvent, dropwise adding acetic acid into the solution, reacting the reaction mixture under stirring, filtering, washing and drying to obtain the covalent organic framework material; and dissolving the obtained Br-COFs material and a PVdF adhesive in an organic solvent to obtain a mixed solution, coating the surface of a copper foil with the mixed solution according to a certain thickness, and forming the Br-COFs artificial interfacial film on the surface of a copper foil electrode after the solvent is volatilized. The preparation method is simple, the preparation process is green and environment-friendly, and the prepared product is high in purity, controllable in structure and high in mechanical strength, can be directly used as an artificial interface film of a lithium metal battery, and shows excellent stability when being used for a Li / Cu battery.

The invention discloses a preparation method of a high-activity hierarchical pore boric acid imprinted hydrogel microsphere adsorbent and application of the adsorbent to selective adsorption of a flavonoid compound naringin NRG. According to the invention, dopamine is used for modifying COFs so as to enhance surface functionalization of COFs; preparing a sulfydryl functionalized covalent organic framework microsphere; synthesizing sulfydryl microspheres by utilizing an emulsion interfacial polymerization method; preparing a COFs boron affinity imprinting microsphere adsorbent based on boron affinity interaction; the adsorbent is applied to selective adsorption of NRG in agricultural wastewater. The prepared adsorbent has a remarkable multilayer adsorption effect, and the adsorption capacity is remarkably improved through the boron affinity effect. The multi-stage pore structure of the COFs microspheres provides abundant sites for adsorption, and the mass transfer rate is remarkably improved. In addition, the prepared adsorbent shows remarkable specificity in the aspects of adsorption and separation of NRG, and a promising adsorption material is provided for industrial separation of NRG.

The invention discloses a multi-component covalent organic framework material for producing hydrogen peroxide based on photocatalysis and a preparation method and application thereof.The preparation method comprises the steps that a catalyst is added into turbid liquid containing an organic monomer, styrene, etherified boron trifluoride, 2, 3-dichloro-5, 6-dichloro-p-benzoquinone and an organic solvent, the mixture is mixed to be uniform, then the mixture is frozen and subjected to a reaction under vacuum after exhausting, and the multi-component covalent organic framework material is obtained; the multi-component covalent organic framework material for producing hydrogen peroxide based on photocatalysis is obtained. The material has the characteristics of adjustable structure height, abundant active centers, good porosity and the like, can be recycled for multiple times, and is a good catalyst for H2O2 production.

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 discloses a synthesis method of a covalent organic framework crystal material at normal temperature, and belongs to the technical field of covalent organic framework synthesis. The synthesis method of the covalent organic framework crystal material at normal temperature comprises the following steps: S1, dissolving an ammonia monomer in a first solvent to obtain an ammonia monomer solution; dissolving an aldehyde monomer in a second solvent to obtain an aldehyde monomer solution; the first solvent or the second solvent is one or two of N, N-dimethylacetamide and dichloromethane; s2, mixing and reacting the ammonia monomer solution, the aldehyde monomer solution, a catalyst and a third solvent to obtain the covalent organic framework crystal material. According to the synthesis method provided by the invention, the covalent organic framework crystal material can be synthesized at a relatively low temperature within a short time.

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.