2595 results about "Aldehyde" patented technology

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 discloses a rare-earth metal arylamine group compound as well as preparation method and application thereof. The invention discloses the rare-earth metal arylamine group compound which is characterized in that a general formula of the rare-earth metal arylamine group compound is (2,6-R12PhNH)5LnLi2(THF)2, wherein Ln is a rear-earth metal selected from one of neodymium, samarium, ytterbium or yttrium; R1 is selected from one of hydrogen, methyl or isopropyl. The rare-earth metal arylamine group compound has the advantages that the rare-earth metal arylamine group compound has a definite structure; raw materials used in the preparation method are simple, easily obtained and cheap; the reaction process is simple and easily operated; the rare-earth metal arylamine group compound product is conveniently purified and the yield of the product is high; the rare-earth metal arylamine group compound has a high activity when acting as a single component catalyst to catalyze a hydrogen phosphine reaction of aldehyde or ketone and phosphite ester; the use amount of the catalyst is less; the yield is high; a substrate has wide universality; a new and simple method is provided for synthesis of a-hydroxyphosphonate.

The invention discloses a zinc-bromine flow battery multifunctional negative electrode electrolyte and a preparation method thereof, and belongs to the technical field of electrochemical energy storage, and the method comprises the following steps: uniformly stirring and mixing a solvent, deionized water and a cosolvent, adding an electrolyte, stirring until the electrolyte is completely dissolved, then adding a supporting electrolyte and a negative electrode additive, stirring until the supporting electrolyte and the negative electrode additive are completely dissolved, and obtaining the zinc-bromine flow battery multifunctional negative electrode electrolyte. The multifunctional negative electrode electrolyte of the zinc-bromine flow battery is obtained; the negative electrode cosolvent is dimethylformamide; and the negative electrode additive is at least one of saponin and cinnamyl aldehyde. Saponin molecules are adsorbed on the surface of the zinc electrode, and electronegative carboxyl groups of the saponin molecules form an electrostatic repulsion net in an electric double layer, so that zinc ions are forced to be uniformly dispersed, local ion concentration hot spots are eliminated, and dendritic crystal nucleation is inhibited from the source. In cinnamyl aldehyde, the strong electronegativity of oxygen atoms and the electronegativity of aldehyde oxygen are far higher than those of hydrogen, so that electrons are strongly attracted, adjacent carbon atoms are positively charged, polar adsorption sites are formed, the hydrogen evolution reaction is effectively inhibited, and the stability and the cycle life of the battery are greatly improved.

The invention relates to the technical field of food fresh-keeping materials, in particular to a chitosan-curcumin nano-composite fresh-keeping agent and a preparation method thereof.The chitosan-curcumin nano-composite fresh-keeping agent comprises nano-particles of a chitosan-sodium alginate-oxidized sodium alginate interpenetrating network structure, according to the nanoparticles, protonated amino groups of chitosan and carboxyl groups of sodium alginate form a polyelectrolyte compound core, aldehyde groups of oxidized sodium alginate and amino groups of chitosan are subjected to a Schiff base reaction to form a chemical cross-linked network, and zinc ions, amino groups of chitosan, carboxyl groups of sodium alginate and carboxyl groups of oxidized sodium alginate form coordination cross-linking; curcumin and epigallocatechin gallate form a compound through a hydrogen bond and a hydrophobic effect, the compound is embedded in an interpenetrating network structure, beta-diketone groups of curcumin and zinc ions form chelating coordination, a chitosan-sodium alginate-oxidized sodium alginate ternary interpenetrating network is constructed, and the chitosan-sodium alginate-oxidized sodium alginate ternary interpenetrating network structure is formed. The stability is improved by utilizing the synergistic effect of triple mechanisms of electrostatic interaction, Schiff base chemical bonds and zinc ion coordination.

The invention relates to the field of oral cavities, and particularly discloses a lasting antibacterial type composite tooth socket for medicine carrying and a preparation method thereof.The lasting antibacterial type composite tooth socket comprises an adsorption layer and an antibacterial membrane layer, the adsorption layer is used for adsorbing oral cavity treatment liquid medicine, and the antibacterial membrane layer comprises a nano-silver antibacterial layer and a chitosan antibacterial layer; the preparation method comprises the following steps: mixing a tea polyphenol-polylactic acid composite solution, a nano-silver-carboxylation modified cellulose compound and a polyvinyl alcohol solution, and carrying out electrostatic spinning to prepare a nano-silver antibacterial fiber membrane, so as to form the nano-silver antibacterial layer; mixing chitosan with hot water, adding cinnamyl aldehyde, glycerol and boric acid, stirring to obtain a mixed solution, coating one side of the nano-silver antibacterial layer with the mixed solution, and curing to form a chitosan antibacterial layer; the adsorption layer is attached to the side, away from the chitosan antibacterial layer, of the nano-silver antibacterial layer, and then the lasting antibacterial type composite tooth socket for carrying the medicine is prepared through hot-pressing compounding. The drug-loaded composite tooth socket has the characteristic of further improving the antibacterial property and the antibacterial durability of the drug-loaded composite tooth socket.

The invention discloses a novel long-acting bird repellent and a preparation method thereof, and belongs to the technical field of chemical bird repelling. The bird repellent is composed of a core material and a wall material, the core material is a mixture of geraniol, cinnamyl aldehyde and allicin according to the mass ratio of 1: (1.2-1.5): (0.5-0.8), the wall material is modified beta-cyclodextrin and pumpkin seed protein nanoparticles, and the mass ratio of the geraniol, the cinnamyl aldehyde and the allicin is (5-7): (3-5): (1-3). The preparation method comprises the following steps: preparing the quaternary ammonium salt modified beta-cyclodextrin, including the core material, performing high-speed shearing emulsification on the quaternary ammonium salt modified beta-cyclodextrin and the pumpkin seed protein nano dispersion liquid, and performing freeze drying to obtain a final product. According to the invention, a stable and compact'molecular inclusion + physical barrier 'dual slow-release structure is constructed by utilizing the electrostatic interaction between the positively charged modified beta-cyclodextrin and the negatively charged protein nanoparticles, the release time of effective components is remarkably prolonged to 9 months or more, and the composite material has excellent rain wash resistance and ultraviolet resistance, and can be used for preparing a composite material with a good application prospect. And efficient, environment-friendly and long-acting bird repelling is realized.

The invention relates to the technical field of adsorption materials, and discloses a post-modified imine-COF adsorbent and a preparation method and application thereof, the adsorbent comprises the following structural units: a COF skeleton, which is a two-dimensional or three-dimensional porous skeleton formed by an aromatic aldehyde monomer and an amino monomer through a Schiff base reaction; the imine group is formed in a COF skeleton through a post-modification reaction, and the imine group is-C = NR, r is selected from one or more of a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted cycloalkenyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted heterocyclic group and a hydrogen atom. The adsorbent retains excellent structural characteristics of the COF material, realizes high density and uniform distribution of functional groups, and avoids interference of functional monomers on crystal nucleation and growth, so that the adsorption performance of the adsorbent is improved, and the adsorbent can efficiently capture rare earth when being applied to a rare earth-containing solution.

The invention discloses an aldehyde reductase mutant and application thereof in synthesis of a dexmethylphenidate hydrochloride intermediate, and belongs to the field of molecular biology and enzyme engineering. The aldehyde reductase mutant, polynucleotide for coding the mutant, and the recombinant expression vector can express the aldehyde reductase mutant and are used for constructing a recombinant cell or a recombinant strain for expressing the aldehyde reductase mutant. The provided aldehyde reductase mutant can catalyze 2-phenyl-2-((R)-piperidine-2)-acetaldehyde into (R)-2-phenyl-2-((R)-piperidine-2)-1-ethanol, especially improves the stereoselectivity of (R)-2-phenyl-2-((R)-piperidine-2)-1-ethanol, solves the problems of strict conditions, complex reaction and high cost in the existing synthesis method, and has a wide application prospect in the field of synthesis of (R)-2-phenyl-2-((R)-piperidine-2)-1-ethanol. Wide application prospects are realized.

The invention discloses a memristor based on a covalent organic framework and a preparation method and application thereof.The memristor comprises a substrate, a semiconductor electrode, a covalent organic framework film and a metal electrode which are sequentially arranged in a stacked mode, and the covalent organic framework film is composed of 1, 3, 4, 5, 6, 7, 8, 8, 9, 10, 11, 12, 13, 14, 16, 17, 17, 17, 17, 17, 17, 17, 17, the catalyst is prepared by condensing 1, 3, 5-tri (4-aminophenyl) benzene and terephthalaldehyde or terephthalaldehyde with an alkyl or alkoxy side chain. The covalent organic framework film has a highly ordered structure and an adjustable porous structure, the preparation process is simple, the film thickness is uniform, the flatness and the crystallinity are high, and the dielectric property is adjusted, so that the switching voltage and the cycling stability of the memristor are adjusted, and the memristor has stable and repeatable switching performance; the COFs-based memristor has high on / off ratio, low device variability and high flexibility, can be used for preparing the COFs-based memristor, can provide technical support for neuromorphic devices with high efficiency, adjustability, structure adjustability and rich functions, and can be applied to the field of intelligent sensing and autonomous system control such as an auxiliary driving system.

The application provides a preparation method of an octene aldehyde liquid-phase hydrogenation catalyst, and steps of the method comprise the following: (1) preparing a salt solution containing nickel ions, copper ions and aluminum ions, heating to 40-80 DEG C, adding a basic precipitator to react, and aging after the reaction is completed; (2) uniformly mixing the precipitate obtained after aging in step (1) with silica sol to obtain slurry; (3) washing and filtering the slurry, then adding alkali metal carbonate powder and boron nitride solid, uniformly mixing, and then shaping, drying and calcining to obtain the octene aldehyde liquid-phase hydrogenation catalyst. The preparation method is simple, green, environmentally friendly and easy to industrialize, the conversion rate and selectivity of the obtained octene aldehyde liquid-phase hydrogenation catalyst are high, and the catalyst is stable in performance and durable.

The invention discloses a nano flower-shaped covalent organic framework material as well as a preparation method, a device and application thereof, and belongs to the field of water treatment. An amino compound and an aldehyde group compound form a covalent organic framework structure with a specific flower-shaped structure under the action of a catalyst and a regulating agent, the covalent organic framework structure continues to react with a carboxyl compound, then metal is loaded, and the nano flower-shaped covalent organic framework material is obtained. Carboxyl in the carboxyl compound responds to uranium in water and does not respond to other metal ions, other interference ions are eliminated, in addition, the carboxyl compound further has sulfydryl which can fix subsequently-loaded metal ions, the loading capacity of the metal ions is improved, and the metal ions can be loaded on the surface of the metal ions in the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface. When the nano flower-shaped covalent organic framework material prepared by the method is used for treating water, uranium ions can quickly reach adsorption sites, and the material as an adsorbent is higher in stability and higher in adsorption selectivity.

The invention provides a preparation method for preparing porous carbon based on an aerogel method, the porous carbon and application of the porous carbon, and belongs to the technical field of porous carbon material preparation. The preparation method comprises the following steps: mixing polyhydroxy phenol, aromatic aldehyde, acrylamide, graphene oxide and lithium salt according to a mass ratio of 100: (50-200): (5-30): (1-5): (1-5), carrying out hydrothermal reaction at 100-200 DEG C for 1-6 hours, and freeze-drying at-40 DEG C to obtain a hydrogel precursor; and carbonizing the precursor in organic heteroatom gas at 500-800 DEG C, mixing the intermediate with alkali according to the ratio of 100: (100-500), activating at 900-1100 DEG C, pickling and drying to obtain the porous carbon. The conductivity of the product is improved by means of graphene, lithium salt and heteroatoms, and the aerogel method obtains large aperture, has the characteristics of low impedance, high first efficiency and small charge-discharge expansion, and can be efficiently applied to silicon-carbon materials.

The invention provides a sulfonated modified COF-based hydrogel based on a TPAD skeleton, and a preparation method and application thereof, and belongs to the field of water treatment. The preparation method comprises the following steps: S1, synthesizing a TPAD-NHBoc amino monomer by using reagents such as 1, 4, 5, 8-tetrachloroanthraquinone and the like; s2, sequentially adding a TPAD-NHBoc amino monomer, a Dha aldehyde monomer, dioxane and trifluoroacetic acid into a glass tube according to a certain proportion, carrying out ultrasonic treatment, stirring, putting into a reaction kettle, and reacting at 115-125 DEG C for 96-120 hours; s3, after the reaction is finished and cooling is performed, carefully taking out the blocky gel from the glass tube, respectively immersing the blocky gel into dioxane and DMF, and repeatedly replacing the solvent for washing; s4, washing the gel, soaking the washed gel in a DMF solution containing 1, 3-propane sultone, and carrying out a reaction at 75-85 DEG C for 16-20 h to obtain sulfonated modified gel; s5, the obtained sulfonated modified COF-based gel is soaked in DMF, acetone, methanol and water for multiple times of soaking and washing, and the hydrogel is obtained. The sulfonated modified hydrogel based on the TPAD skeleton has excellent solar photo-thermal water evaporation performance.

The application discloses a kind of sulfonic acid group covalent organic framework / Nafion composite material for proton conduction and preparation method and application thereof, belong to fuel cell technical field.The application first utilizes double sulfonic acid group organic aromatic amine ligand and aldehyde group ligand to construct a kind of sulfonic acid functional two-dimensional covalent organic framework material COF-(SO3H)2 by condensation reaction.COF-(SO3H)2 is compounded with Nafion polymer to prepare proton exchange membrane, and the proton exchange membrane material has excellent proton conduction, and the proton conductivity is 1.338*10 ‑1 S·cm ‑1 (80ºC).The proton exchange membrane material of the application is prepared by solvothermal process and casting method, and the preparation method is simple and easy to operate, which provides a new choice for proton conduction material in fuel cell, and expands the application value of covalent organic framework material.

The invention belongs to the technical field of high polymer material synthesis, and particularly relates to an artificial antioxidant enzyme material with an interlayer structure and a preparation method of the artificial antioxidant enzyme material. The preparation method of the artificial antioxidant enzyme material comprises the following steps: dissolving an aldehyde monomer and an amine monomer in a reaction solvent, performing thermal polymerization under the action of an acid catalyst, and then loading interlayer coordination metal, and further defining an aldehyde monomer and an amine monomer as well as an interlayer coordination metal. According to the present invention, the treatment-level oxidation resistance can be achieved through the space-optimized catalysis center and the fully-conjugated frame structure, and the innovative strategy is provided for solving the inflammation-driven tissue damage through the precise oxidation-reduction regulation and the immune microenvironment engineering.

The invention belongs to the technical field of food packaging and fresh-keeping materials, and discloses an ethylene adsorption and pH / pectinase double-response intelligent antibacterial composite film as well as a preparation method and application thereof. The composite film comprises a base film and a functional carrier distributed in the base film, the functional carrier is a material ZIF-8-cinnamyl aldehyde-pectin capable of adsorbing ethylene and responding to pH and pectin, and the base film comprises a film-forming polymer and a natural antibacterial agent. According to the composite film, efficient adsorption of ethylene released in the storage period of fruits and vegetables is achieved through a porous structure of ZIF-8, meanwhile, a synergistic effect is formed by an acid environment naturally generated in the fruit and vegetable ripening and rotting process and pectinase, and intelligent slow release of cinnamyl aldehyde loaded on ZIF-8 is accurately triggered; cinnamyl aldehyde can form a double-channel intelligent antibacterial system with the natural antibacterial property of chitosan in a film base material and the metal ion antibacterial property of ZIF-8, maturation and aging of typical respiratory climacteric fruits and vegetables can be remarkably delayed, and the antibacterial film has extremely high industrial application potential.

The invention belongs to the field of separation membranes, and particularly relates to an anti-pollution and washable reverse osmosis membrane and a preparation method thereof. The reverse osmosis membrane provided by the invention is prepared according to the following steps: soaking a nascent state polyamide reverse osmosis membrane in a first treatment solution, taking out and cleaning, then soaking in a second treatment solution, taking out and draining to obtain the anti-pollution and washing-resistant reverse osmosis membrane, the nascent state polyamide reverse osmosis membrane comprises a non-woven fabric layer, a porous support layer and a polyamide separation layer which are in contact in sequence; the first treating fluid contains double-end amino polyethylene glycol and triethylamine; the second treatment liquid contains polyvinyl alcohol and alpha-aldehyde group-omega-carboxyl polyethylene glycol. Experimental results show that the reverse osmosis membrane provided by the invention has relatively high anti-pollution capacity, desalting rate and acid and alkali cleaning resistance.

The invention relates to a synthesis method of a diunsaturated ester compound catalyzed by N-heterocyclic carbene, and belongs to the field of organic synthesis. According to the preparation method, the synergistic effect of N-heterocyclic carbene and light is utilized, gamma-oxo unsaturated aldehyde and Katritzky salt are taken as starting raw materials, the Katritzky salt generates alpha-ester free radicals through a single electron transfer process under the illumination condition, the free radicals react with a nucleophilic trienol intermediate generated through catalysis of the N-heterocyclic carbene, and the alpha-ester free radicals react with the nucleophilic trienol intermediate to generate the gamma-oxo unsaturated aldehyde. Target products are obtained with good yield and high regioselectivity, so that a series of epsilon-alkylated diunsaturated ester compounds are efficiently synthesized. The method is simple and convenient to operate, green and efficient, has the advantages of no transition metal participation, wide substrate applicability and the like, provides a new way for synthesis of the diunsaturated ester compound, and has a wide application prospect.

The invention relates to preparation of a crystalline allyl covalent organic framework material and application research of the crystalline allyl covalent organic framework material in benzamide cyclization green photocatalytic conversion. The SF-COF material is prepared by adopting a step-by-step synthesis method. The preparation method comprises the following steps: synthesizing a COF precursor by taking 1, 3-benzenetricarboxaldehyde and p-aminophenylacetonitrile as raw materials, and preparing the allylation covalent organic framework material with the electronic push-pull effect from the COF precursor and 5, 5 ', 5'-(benzene-1, 3, 5-triyl) tri (thiophene-2-formaldehyde) through a solvothermal method. The material is applied to the field of photocatalytic organic conversion, and benzamide cyclization and conversion of derivatives of benzamide are achieved under irradiation of a blue light LED. The prepared SF-COF has the advantages of efficient charge separation and electron conduction performance, good structural stability and chemical stability and the like. And a catalyzed organic reaction substrate has the advantages of wide universality range, good cycle stability and the like, and shows excellent photocatalytic conversion capability.

The invention discloses a method for preparing a porous carbon material by recycling coal gasification slag and semi-coke wastewater, which comprises the following steps: by taking coal gasification fine slag as a carrier and semi-coke wastewater as a phenol source, carrying out flotation-acid leaching modification on the fine slag to purify a carbon-rich component and optimize the surface adsorption activity of the carbon-rich component; then fully adsorbing phenolic substances in the wastewater by utilizing the modified slag body; introducing a composite aldehyde cross-linking agent, and initiating an in-situ phenolic aldehyde polymerization reaction to generate a composite precursor; the precursor is subjected to high-temperature carbonization and alkali activation pore forming, and finally the porous carbon material with the characteristics of high specific surface area, rich graded pores and low ash content is prepared. According to the process, full-amount collaborative recycling of the two wastes is achieved, and the process is green and free of secondary pollution. The obtained material is high in carbon content and rich in defect structure and surface functional groups, shows excellent adsorption capacity and catalytic carrier performance, can be widely applied to the fields of deep purification of water pollutants, adsorption of volatile organic compounds, energy catalysis and the like, and has remarkable environmental protection benefits and resource economic values.

A natural aldehyde-functionalized all-biomass aerogel and a preparation method thereof, the method comprises: (1) dispersing chitosan in a starch-like fiber solution and stirring to obtain a uniform mixed solution; (2) adding genipin as a crosslinking agent to the mixed solution obtained in step (1), heating and stirring for a period of time to obtain an aerogel precursor solution, and allowing the same to stand to undergo crosslinking to obtain a hydrogel; (3) freezing the hydrogel obtained in step (2), and then freeze-drying to obtain an aerogel; (4) soaking the aerogel obtained in step (3) in a natural aldehyde solution for graft modification, then removing and rinsing, and subsequently drying to obtain the aldehyde-functionalized aerogel.

The invention belongs to the technical field of biological medicines, and discloses lipid nanoparticles for muscle in-situ delivery as well as a preparation method and application of the lipid nanoparticles. According to the invention, four components Ugi of aldehyde, isonitrile, amine and carboxylic acid are subjected to a reaction to synthesize the ionizable cationic lipid. The ionizable cation lipid formed by introducing an ionizable cation head group into an isonitrile component has muscle in-situ nucleic acid delivery performance. The unsaturation degree of a lipid hydrophobic tail chain, the number of methylene spacers of an ionizable cation head group and LNP formula composition and process are further optimized, muscle in-situ selective mRNA delivery performance is enhanced, off-target liver expression is avoided, safety can be improved, and different application requirements of mRNA vaccines, nucleic acid drugs, gene editing and the like can be met.

The invention belongs to the technical field of organic synthesis, and relates to a preparation method of 5, 5-dimethyl-4, 5-dihydroisoxazole. The method comprises the following steps: (1) reacting isopentenal with an oximation agent to obtain a reaction solution containing isopentenal oxime; (2) dropwise adding the reaction liquid into a mixture containing isopentenal and an acid catalyst for reaction to obtain a product; or when the reaction liquid contains water, performing phase splitting on the reaction liquid to obtain an organic phase, and dropwise adding the organic phase into a mixture containing the isopentenal and the acid catalyst for reaction to obtain a product. The method does not produce ketone by-products, and is good in atom economy, high in reaction yield, good in technological process continuity, low in cost, few in materials, simple to operate, mild in reaction condition, low in requirements on production equipment and suitable for large-scale industrial production.

The invention discloses HA-PAS hydrogel for enhancing cartilage repair of early osteoarthritis and a preparation method of the HA-PAS hydrogel. According to the hydrogel, formylated hyaluronic acid, hydrazide modified low-methoxyl pectin and phenylboronic acid modified alginate form a ternary polysaccharide skeleton, a double-dynamic cross-linked network is formed through acylhydrazone bonds and boric acid ester bonds, and a triple network structure is formed by combining permanent cross-linking catalyzed by horse radish peroxidase. The hydrogel integrates functional components such as nano-selenium, a pulullan-strontium chelate and a mesenchymal stem cell source exosome, so that multiple effects of resisting oxidation, resisting inflammation, promoting cartilage differentiation and repairing subchondral bones are achieved. The compression modulus of the hydrogel is 0.8-1.5 MPa, and the hydrogel can be injected for in-situ gelling and MMP responsive degradation, shows an excellent cartilage repair effect in animal experiments, and provides a new solution for treatment of early osteoarthritis.

The invention discloses a preparation method and application of a metal covalent organic framework material, and the prepared metal covalent organic framework material can be used for adsorption separation of elemental iodine pollutants and shows excellent iodine adsorption capacity and rate. According to the preparation method, 1H-pyrazole-4-formaldehyde and copper nitrate trihydrate are subjected to a solvothermal reaction to prepare a copper ion ring trinuclear metal complex with an aldehyde group, and the copper ion ring trinuclear metal complex and 1, 3, 5-tri (4-aminophenyl) benzene are further subjected to a Schiff base reaction to prepare the metal covalent organic framework material containing copper ions. According to the metal covalent organic framework material disclosed by the invention, copper ion active adsorption sites in a chemical structure are also retained while a developed microporous structure is maintained, and the interaction strength of pore channels to iodine is remarkably enhanced, so that the iodine adsorption rate and capacity are remarkably improved. The preparation method is simple, convenient, universal and high in controllability, and large-scale production and manufacturing of the metal covalent organic framework adsorption material can be achieved.

The invention provides an adsorption material and a preparation method and application thereof, the adsorption material comprises a carrier and an endotoxin affinity binding ligand, the endotoxin affinity binding ligand comprises a recombinant C factor protein, and the carrier and the recombinant C factor protein are connected through a spacer arm; wherein the carrier comprises at least one of resin, chitosan, cellulose, agarose and glucan; the spacer arm comprises at least one of modified polyethylene glycol, polyvinyl pyrrolidone, polymethylacrylic acid-2-hydroxyethyl ester, polyvinyl alcohol, polyacrylic acid, hexamethylenediamine, divinyl sulfone and glutaraldehyde, and at least one end of the modified polyethylene glycol is provided with carboxyl, aldehyde or amino. The adsorption material provided by the invention can efficiently adsorb endotoxin, has the characteristics of low toxicity risk and excellent blood compatibility, and can improve the safety of blood purification.

The present invention relates to the technical field of polymer preparation. Disclosed are a covalent organic framework material, and a preparation method therefor and a use thereof. The preparation method for the covalent organic framework material comprises the following step: subjecting an organic aldehyde and an organic amine to a condensation reaction in a deep eutectic solvent to obtain the covalent organic framework material, wherein the deep eutectic solvent is a two-component eutectic liquid composed of menthol and acetic acid. The temperature for the reaction is 25-120ºC, and the time for the reaction is 1-72 hours. The deep eutectic solvent composed of menthol and acetic acid used in the present invention has good dissolution properties for organic matters, and can also efficiently catalyze the condensation reaction between the organic amine and the organic aldehyde. The prepared covalent organic framework material exhibits high crystallinity and has good applications in the fields of adsorptive separation, heterogeneous catalysis, energy storage, etc. The present method has mild reaction conditions, simple operation, and good universality, is conducive to industrial large-scale production, and conforms to the concept of green chemistry.

The invention discloses a high-performance thermosetting resin plugging material, a preparation method and a water-based drilling fluid, and relates to the technical field of oilfield chemistry, and the preparation method of the plugging material comprises the following steps: stirring an aromatic compound containing two double bonds with sodium tungstate, a transfer catalyst and a hydrogen peroxide solution at room temperature for reaction, and purifying to obtain an epoxy compound; the preparation method comprises the following steps: heating an aromatic compound containing an aldehyde group, ammonium formate and a palladium-carbon catalyst with nitrogen to react to obtain an amine compound, transferring the epoxy compound and the amine compound into a size-adjustable mold, carrying out heating curing treatment, carrying out low-temperature ball milling on a crude product to obtain plugging material particles, and preparing the water-based drilling fluid by using the plugging material particles. The specific aromatic rigid framework monomer is selected, and the molar ratio of epoxy to the curing agent is accurately controlled, so that the mechanical strength and thermal stability of the material are remarkably optimized, and the plugging material has a good treatment effect on cracks and pores in complex stratums.

The invention relates to the technical field of sodium ion battery negative electrode materials, in particular to a phenolic resin-based hard carbon sodium ion battery negative electrode material, a negative electrode and a preparation method and application thereof. The crosslinking degree and the main chain rigidity of the phenolic resin are regulated and controlled by regulating the number of benzene rings in side chains of aldehyde molecules, so that the internal space (free volume) of the phenolic resin is influenced, and a rich closed-pore structure is finally formed; then waste gas generated by pyrolysis of phenolic resin is used as a carbon source for chemical vapor deposition, and resin carbon is used as a substrate, so that the pore surface of hard carbon can be effectively sealed, electrolyte permeation is prevented, and open pores in the hard carbon material are converted into closed pore structures to be used as efficient sodium storage sites. Meanwhile, the method also has green sustainability and cycle economy, volatile waste gas generated by pyrolysis is reutilized as a carbon source to be deposited on the surface of resin carbon, the carbon yield is improved, the dynamic performance of the hard carbon material is also improved, and emission of the volatile waste gas is reduced.

The invention discloses a hollow covalent organic framework fiber separation membrane with a molecular recognition function and a preparation method and application thereof.The method comprises the steps that polylactic acid and aldehyde monomers are added into a solvent A, and an aldehyde-loaded spinning solution is prepared; spinning the aldehyde-loaded spinning solution to obtain an aldehyde fiber precursor membrane; taking the formylated fiber precursor membrane as a template, immersing the formylated fiber precursor membrane into a reaction system consisting of an amino monomer, a catalyst and a solvent B, and initiating dynamic covalent assembly to prepare a COF shell-coated fiber membrane; immersing the fiber membrane coated with the COF shell layer into a solvent C to remove the polylactic acid template so as to prepare hollow COF fibers; and immersing the hollow COF fiber into a solvent system containing a gas recognition functional monomer, and constructing a gas molecule recognition layer on the surface of the hollow COF fiber to prepare the hollow COF fiber separation membrane. According to the application, the hollow covalent organic framework fiber separation membrane is applied to precise recognition operation of sulfur-containing gas. According to the invention, an efficient and energy-saving innovative membrane material with resource enrichment potential can be prepared.