750 results about "Solvothermal reaction" patented technology

The invention discloses preparation of a high-uniformity cerium oxide abrasive material and application of the high-uniformity cerium oxide abrasive material in a chemical mechanical polishing solution. According to a method, cerium nitrate or cerium oxalate is used as a cerium source, a cationic or nonionic surfactant is used as a structure-directing agent, and the high-uniformity cerium oxide abrasive material is prepared in a mixed solvent system formed by water and isopropanol or water and diethylene glycol according to a specific volume ratio. The preparation method comprises the following steps: regulating the particle size and the morphology structure through a solvothermal reaction, carrying out cleaning, drying and high-temperature calcination treatment on a reaction product to obtain sphere-like cerium oxide nano-particles with high particle size concentration ratio, moderate surface roughness and good dispersity, adding cerium oxide powder into deionized water, and carrying out ultrasonic dispersion to obtain the spherical cerium oxide nano-particles. And sequentially adding a dispersing agent and amino acid while stirring, uniformly stirring, fixing the volume, and adding a pH regulator to enable the solution to be weakly acidic, thereby obtaining the chemical mechanical polishing solution. The cerium oxide submicron powder which is different in surface appearance, particle size and distribution uniformity is prepared by adjusting the solvent ratio and other reaction conditions.

The invention discloses a macrocyclic covalent organic polymer material for inhibiting a pi-pi stacking effect and application of the macrocyclic covalent organic polymer material, and belongs to the technical field of biological medicines. The preparation method comprises the following steps: adding 5, 10, 15, 20-tetra (4-ethynylphenyl) copper porphyrin and a macrocyclic monomer into an organic solvent in a protective atmosphere, and carrying out solvothermal reaction in the presence of a catalyst and alkali to obtain the macrocyclic covalent organic polymer material. According to the invention, 5, 10, 15, 20-tetra (4-ethynylphenyl) copper porphyrin and a macrocyclic monomer form a porous polymer MCP-CU-POP, the material utilizes the photo-thermal capability to combine the effects of simulated photo-thermal (PTT), photodynamic (PDT), peroxidase (PODs) and glutathione peroxidase (GSH-Px) to perform synergistic antibiosis, and the inherent characteristics of an infected microenvironment can also be utilized to induce death of bacteria, so that the antibacterial property of the material is greatly improved, and the antibacterial property of the material is greatly improved. And the microenvironment of the bacterial infection part can be adjusted, so that the recovery of the bacterial infection wound can be obviously accelerated.

The invention relates to the technical field of water pollutant removal, in particular to a UiO-66 / sodium carboxymethyl cellulose / polyvinyl alcohol / melamine sponge composite material and a preparation method and application thereof.The preparation method comprises the steps that zirconium chloride and terephthalic acid are dissolved in an organic solvent to obtain a mixed solution, the mixed solution is transferred into a reaction kettle, and through solvothermal reaction, the UiO-66 / sodium carboxymethyl cellulose / polyvinyl alcohol / melamine sponge composite material is obtained; the preparation method comprises the following steps: preparing UiO-66 powder; putting UiO-66 powder into the sodium carboxymethyl cellulose solution, and uniformly stirring the UiO-66 powder and the sodium carboxymethyl cellulose solution to obtain a UiO-66 / CMC mixed solution; placing the UiO-66 / CMC mixed solution in a polyvinyl alcohol solution, and uniformly stirring the UiO-66 / CMC / PVA mixed solution to obtain a UiO-66 / CMC / PVA mixed solution; the preparation method comprises the following steps: dipping a melamine sponge in a UiO-66 / CMC / PVA mixed solution to obtain an adsorption saturated melamine sponge; the UiO-66 / CMC / PVA / coated MS composite material is obtained by repeatedly freezing and thawing the adsorption saturated melamine sponge for multiple times and then freeze-drying, the composite material can be used for rapidly, efficiently and selectively removing phosphate or fluorine ions and the like in water and is convenient to separate and recycle, and a new thought is provided for development of efficient water treatment adsorbent materials.

The invention discloses a sodium alginate embedded iron-carbon microcapsule material for repairing cadmium and arsenic polluted soil and a preparation method of the sodium alginate embedded iron-carbon microcapsule material, and belongs to the technical field of soil heavy metal pollution repairing materials. The material comprises straw biochar, high-iron steel slag powder, a sulfydryl acetylated chitosan-iron monatomic cluster compound, a boron-doped graphitized carbon coated cobalt ferrite nanosheet, sodium alginate, calcium chloride and sodium carbonate. Wherein the sulfydryl acetylated chitosan is prepared by reacting chitosan with sulfydryl acetic anhydride, dialyzing and drying, and performing solvothermal reaction with ferric nitrate under high pressure. The preparation method comprises the following steps: pyrolyzing and drying the straw biochar, reacting the high-iron steel slag with sulfuric acid, adding the biochar, adjusting the pH value, adding sodium carbonate, mixing to obtain an iron-carbon-based passivation material, mixing with two modified compounds, mixing with a sodium alginate solution, dropwise adding a calcium chloride solution, and stirring and curing. The material can be applied to remediation of cadmium and arsenic polluted soil.

The invention relates to a porphyrin metal organic framework composite material, a preparation method and a biogenic amine SERS (Surface Enhanced Raman Scattering) array sensor. The preparation method of the composite material comprises the steps that a copper precursor solution is added into a surfactant, heating reaction is conducted, a reducing agent is added, heating reaction is conducted, and copper nanoparticles are obtained; the preparation method comprises the following steps: adding a transition metal salt and a surfactant into an organic solvent, adding a porphyrin ligand, carrying out a solvothermal reaction, carrying out centrifugal separation, washing and drying to obtain a porphyrin metal organic framework material, and dispersing the porphyrin metal organic framework material into the organic solvent to obtain a dispersion liquid A; and dispersing copper nanoparticles in the dispersion liquid A, carrying out a second heating reaction, and carrying out centrifugal separation, washing and drying to obtain the porphyrin metal organic framework composite material. The invention also provides the porphyrin metal organic framework composite material prepared by the preparation method, and the application of the porphyrin metal organic framework composite material as a biogenic amine SERS array sensor. The invention solves the problem that the accuracy of the detection result is influenced because the traditional biogenic amine detection method is difficult to realize field detection.

The invention discloses a sensing material for detecting atmospheric carboxylic acid, a preparation method, a detection method and application, belongs to the technical field of environmental functional materials, and solves the problems that an existing method is complex in operation and cannot realize real-time online monitoring, the sensing material for detecting atmospheric carboxylic acid is an MOF-802-EDTA-Pt composite film, and the preparation method comprises the following steps: taking 1, 3, 4, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5- The preparation method comprises the following steps: synthesizing an MOF-802 material through a hydrothermal reaction by taking 1, 3, 5-benzene tricarbonic acid (BTC) and aluminum nitrate as raw materials and ethylene diamine tetraacetic acid (Na-EDTA) as a ligand; the preparation method comprises the following steps: dispersing MOF-802 in DMF to form a coating solution, and forming a film on a glass substrate through a pulling method; and then loading platinum nanoparticles, and carrying out solvothermal reaction and vacuum drying to obtain the composite sensing film. The MOF-802-EDTA-Pt composite film has a porous structure and fluorescence characteristics, and detection is realized through a fluorescence quenching effect of carboxylic acid molecules and an MOF skeleton. The method disclosed by the invention is controllable in process and high in material stability, still keeps excellent selectivity under the coexistence condition of interferents such as CO2 and NO2, and is suitable for real-time monitoring of carboxylic acid pollutants in the atmospheric environment.

The invention discloses an Ag / Cu2O / Bi2WO6 heterojunction photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalytic materials. The Ag / Cu2O / Bi2WO6 heterojunction photocatalyst is prepared from the following components in percentage by mass: 10 to 30 percent of Cu2O. Bi2WO6 is prepared through solvothermal reaction, then Ag is generated in situ through a heating and stirring method, finally, the Ag / Cu2O / Bi2WO6 heterojunction photocatalyst is synthesized through heating and stirring, and the Ag / Cu2O / Bi2WO6 heterojunction photocatalyst can be applied to the field of photocatalytic reduction of CO2. Compared with an existing photocatalyst, the Ag / Cu2O / Bi2WO6 heterojunction has good yield and stability, and a strong built-in electric field at the heterojunction interface can accelerate separation and transfer of carriers and enhance adsorption and activation of CO2, so that the activity of photocatalytic reduction of CO2 is enhanced.

The invention discloses a multi-metal active site covalent organic framework material, a preparation method thereof and application of the multi-metal active site covalent organic framework material in activating PMS to degrade pollutants, the multi-metal active site covalent organic framework material comprises metalloporphyrin and bipyridine groups, when porphyrin loads metal, metal atoms are connected through coordination of two nitrogen sources of bipyridine, the metal atoms are connected through coordination of two nitrogen sources of bipyridine, and therefore the multi-metal active site covalent organic framework material is obtained. Multi-metal active sites are formed; the metal active sites are increased, and the distance between metals is adjusted, so that the framework material shows excellent catalytic activity. The covalent organic framework material is prepared through a solvothermal reaction, the covalent organic framework material continues to react with a metal precursor to load metal, the preparation method is simple, a complex reaction process and harsh reaction conditions are not needed, and large-scale preparation can be achieved.

The invention discloses a mannitol-based covalent organic framework antibacterial material for specifically killing escherichia coli, and belongs to the technical field of biological medicines. Fesalen, mannitol and an accelerant are added into an organic solvent for a solvothermal reaction, an obtained product is washed and dried after the reaction is finished, and the mannitol-based covalent organic framework antibacterial material capable of specifically killing escherichia coli is obtained. The preparation method comprises the following steps: modifying a Salen monomer with iron to obtain an alen metal complex Fesalen, endowing Fesalen with good photo-thermal performance through metal modification, and then polymerizing with mannitol to prepare Fesalen-cof. Fesalen-cof can be used as an intelligent therapeutic agent, photo-thermal / POD cascade collaborative treatment is achieved, specific killing of escherichia coli is achieved, and a new thought is provided for precise sterilization.

A bimetal active site doped carbon-based catalyst, which is particularly a ZnMn-N-C catalyst. The ZnMn-N-C catalyst is prepared by using 1H-1,2,3-triazole, manganous nitrate and zinc chloride as reaction raw materials, subjecting same to a solvothermal reaction and then to drying to obtain a Mn-MET-ZnCl2 powder, and then sequentially subjecting the powder to primary pyrolysis, a sulfuric acid treatment and secondary pyrolysis. By respectively using 1H-1,2,3-triazole and zinc chloride as a mesopore forming agent and a micropore forming agent, and adjusting the pore-forming sequence and controlling the pore-forming process by means of pyrolysis, a large number of mesopores are preferentially formed, and then a large number of micropores are uniformly distributed in the mesopores, thereby forming a hierarchical pore channel structure and overcoming the problem of the collapse of the pore channel structure during the formation of the structure; and the obtained bimetal site doped carbon-based catalyst ZnMn-N-C has a high specific surface area of 1837.9 m2 / g and exhibits a good ORR activity (E1 / 2=0.867 V vs. RHE), and a primary zinc-air battery assembled by using the catalyst ZnMn-N-C as a positive oxygen reduction catalyst has a high energy density of 889 Wh / kg-1 Zn.

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 a core-shell type rare earth gradient doped positive electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: introducing a mixed metal source solution and a first complexing agent into a mixed solvent, carrying out solvothermal reaction to obtain a core precursor, then continuously heating to a first temperature, introducing a rare earth doped source solution, and carrying out solvothermal reaction to obtain a core precursor; continuously raising the temperature to a second temperature for heat preservation, and finally quenching to obtain a precursor material; and mixing and sintering a lithium source and the precursor material to obtain the core-shell type rare earth gradient doped positive electrode material. According to the preparation method, coprecipitation reaction kinetics and a gradient locking process are synchronously regulated and controlled through a mixed solvent system, composition segregation is avoided, lattice distortion is triggered by adopting a solvothermal system, gradient doping of rare earth elements is induced, the interface mutation defect of a traditional core-shell structure is broken through, and the performance of the core-shell structure is improved. And synchronous improvement of high specific capacity and ultra-long cycle life is realized synergistically.

The invention discloses a preparation process of a composite rotating wheel for adsorption and dehumidification in a low-dew-point environment, which comprises the following steps: adding metal salt into a solution of a mixed organic ligand, adding an organic solvent, mixing with water, completely dissolving, carrying out solvothermal reaction, cooling to remove unreacted monomers and impurities, cleaning, and drying to obtain an MIL-101 (Cr) precursor adsorption material; the method comprises the following steps: dipping an adsorption material in different hygroscopic salt solutions to obtain a modified adsorption material; carrying out activating treatment; preparing the activated MIL-101 (Cr) adsorption material into slurry, coating the surface of glass fiber paper with the slurry, drying the glass fiber paper, and feeding the glass fiber paper into a rotating wheel; according to the present invention, the regular pore channel of MIL-101 (Cr) is adopted as the carrier so as to uniformly disperse the hygroscopic salt, such that the capture efficiency of the water molecules under the low humidity is enhanced, and the equilibrium adsorption capacity and the adsorption dynamic performance of the material under the low dew point environment are significantly improved;

The application discloses a FeOOH / C primary-secundary hydrogen conversion catalyst and a preparation method thereof. The FeOOH / C primary-secundary hydrogen conversion catalyst has a FeOOH mass content of 30-90%, a specific surface area of 150-750 m 2 / g, a particle size of 20-60 meshes, and a bulk density of 0.2-0.8 g / mL. The preparation method is as follows: (1) uniformly mixing iron salt, an organic ligand, an organic polymer and a solvent by mass to obtain a precursor mixture; (2) performing a solvothermal reaction on the precursor mixture in a closed container, performing solid-liquid separation, vacuum drying the solid particles, and then calcining the Fe / C composite under an inert atmosphere to obtain a Fe / C composite; (3) adding the Fe / C composite into a proper amount of an aqueous solution containing an oxidant, and performing liquid-phase oxidation under a closed condition until the liquid-phase oxidation is fully performed; and (4) washing, drying, crushing and screening the obtained product to obtain a supported primary-secundary hydrogen conversion catalyst with a FeOOH / C structure. The FeOOH / C primary-secundary hydrogen conversion catalyst has the advantages of low preparation cost, simple production process, low material flow resistance and good catalytic effect.

The invention relates to a Bi19Br3S27-NiSX catalyst. In the Bi19Br3S27-NiSX catalyst, an amorphous phase NiSX is loaded on a crystal phase Bi19Br3S27. The preparation method of the catalyst comprises the following steps: taking bismuth salt and nickel salt as raw materials, dissolving the raw materials into ethylene glycol, and then adding a sulfur source and a bromine source to obtain a mixed solution; and carrying out solvothermal reaction on the mixed solution to obtain the Bi19Br3S27-NiSX catalyst. The invention relates to a Bi19Br3S27-NiSX catalyst which is applied to production of ethylene through photo-thermal CO2 reduction. The catalyst has the beneficial effects that the catalyst has excellent sunlight full-spectrum light absorption property and photo-thermal conversion capacity, the surface activity of the catalyst is remarkably improved through introduction of the NiSX amorphous phase, the electron transfer efficiency in catalytic reaction is enhanced, the light energy utilization efficiency is improved through the synergistic effect of the multi-component catalyst, and CO2 is subjected to high-selectivity catalytic reduction to produce ethylene.

The invention discloses a non-noble metal ORR catalyst and a preparation method thereof, and belongs to the technical field of electro-catalysis. The method comprises the following steps: (1) adding 5, 10, 15, 20-tetra (4-cyanophenyl) porphyrin and nickel salt into an organic solvent, and synthesizing a supramolecular crystal precursor UPC-S7 through solvothermal reaction; (2) carbonizing the supramolecular crystal precursor UPC-S7 in an inert atmosphere to obtain a Ni-coated NC material; (3) oxidizing the Ni-coated NC material in an oxygen-containing atmosphere to obtain a Ni / NiO-coated NC material; and (4) sequentially soaking and etching the Ni / NiO-coated NC material by using a nitric acid solution and an ammonia water solution, and then washing and drying to obtain the non-noble metal ORR catalyst. The prepared catalyst does not contain precious metal such as platinum, the raw material cost is remarkably reduced on the basis of ensuring the ORR activity and stability of the catalyst, and a new scheme is provided for solving the cost bottleneck of a fuel cell.

The invention relates to a positive electrode material and a preparation method and application thereof, and the preparation method of the positive electrode material provided by the invention comprises the following steps: taking a positive electrode material matrix, and reducing surface residual alkali to obtain a pretreated positive electrode material matrix; the method for reducing the residual alkali on the surface comprises the following steps: mixing with a solvent to perform solvothermal reaction, sequentially depositing aluminum, fluorine and lithium on the surface of the pretreated positive electrode material substrate through an aluminum source, a fluorine source and a lithium source, and repeating the deposition steps to obtain the fluorine-aluminum-lithium layer with a target thickness. The surface of the obtained positive electrode material is coated with a fluorine-aluminum-lithium thin film, and fluorine-aluminum-lithium nano-particles protrude on the fluorine-aluminum-lithium thin film. According to the positive electrode material, the interface problem existing between the high-nickel nickel-cobalt-manganese ternary positive electrode material and the sulfide solid electrolyte can be weakened, and the capacity and the cycle performance of the battery are improved.

The invention belongs to the technical field of electro-catalysis water decomposition, and relates to a self-supporting W-NiCoP / NF composite material and a preparation method and application thereof. Cobalt salt, terephthalic acid, acetic acid and foamed nickel are subjected to a first solvothermal reaction, and defect type Co-MOF / NF is obtained; immersing the defect type Co-MOF / NF into a tungstate solution, and then carrying out a second solvothermal reaction to obtain a defect type W-Co-MOF / NF precursor; and carrying out phosphating heat treatment on the defect type W-Co-MOF / NF precursor and a phosphorus source in an inert atmosphere to obtain the W-Co-MOF / NF composite material. According to the preparation method disclosed by the invention, the tungsten-doped nickel-cobalt bimetallic phosphide with rich defect structures is successfully constructed on the foamed nickel substrate through a step-by-step solvothermal and gas-phase phosphating strategy, so that organic combination of a bimetallic synergistic effect and defect engineering is realized; the prepared self-supporting composite material has more active sites, a better electronic structure regulation effect and better stability.

The invention discloses a covalent organic framework material for regulating and controlling a metal coordination distance, a preparation method of the covalent organic framework material and application of the covalent organic framework material in activating PMS to degrade pollutants, on the basis of original metalloporphyrin, metal atoms are connected at the position of an intermediate linking group in a coordination manner, so that the loading capacity of metal is increased, and the stability of the metal is improved; the distance between two adjacent metal atoms is greatly shortened, the electron transfer efficiency is enhanced, and the catalytic activity of the framework material is improved; therefore, the framework material shows excellent catalytic activity. The covalent organic framework material is prepared through a solvothermal reaction, the covalent organic framework material continues to react with a metal precursor to load metal, the preparation method is simple, a complex reaction process and harsh reaction conditions are not needed, and large-scale preparation can be achieved.

The invention belongs to the technical field of crystalline materials, and relates to a metal-organic coordination polymer crystal material, in particular to a nickel-based double-ligand coordination polymer crystal material as well as a preparation method and application thereof. The chemical formula of the nickel-based double-ligand coordination polymer crystal material is {[Ni (1, 4-bib) (BDC) (H2O) 2]. (1, 4-bib) 0.5. H2O} n, and the preparation method comprises the following steps: dissolving NiCl2. 6H2O, H2BDC and 1, 4-bib in a DMF / water mixed solution with a volume ratio of 1: 1, sealing, carrying out a solvothermal reaction, heating at a constant temperature of 90.0 DEG C for 3 days, and slowly cooling the system to room temperature to obtain a green bulk crystal G-Ni. The nickel-based double-ligand coordination polymer crystal material can be applied to Ag < + > recognition and antibiotic detection.

The invention discloses a preparation method and application of an S-type heterostructure material with a plasma resonance effect, and the preparation method comprises the following steps: grinding a precursor material, calcining, collecting solid powder, carrying out reflux purification in deionized water, and collecting white powder; dispersing the white powder in a hydrazine hydrate solution, carrying out solvothermal reaction to obtain a faint yellow solution, repeatedly dissolving and precipitating by respectively using acidic and alkaline reagents, washing and drying to obtain a faint yellow solid product; uniformly grinding the faint yellow solid product, calcining the faint yellow solid product in an atmosphere furnace, and cooling to obtain orange solid powder; and adding the orange solid powder into an organic solvent of a precursor containing a tungsten source, and centrifuging, washing and drying after the solvothermal reaction is finished to obtain the S-type heterostructure material with the plasma resonance effect. The S-type heterostructure material with the plasma resonance effect has relatively high efficiency for simulating separation and removal of uranium species in post-treatment wastewater and shows relatively good anti-radiation stability.

The invention provides fluorescent carbon dots and fluorescent hydrogel based on solvent stimulation response discoloration and a preparation method and application of the fluorescent carbon dots and the fluorescent hydrogel, and belongs to the technical field of fluorescent materials and information encryption. The preparation method of the fluorescent carbon dots comprises the following steps: mixing a biomass carbon source and a solvent, and performing solvothermal reaction to obtain the fluorescent carbon dots, the biomass carbon source comprises one or more of buxus buxus, oriental cherry leaves, fructus forsythiae leaves and oak leaves; the solvent is ethanol. The biomass carbon dots are low in toxicity, excellent in optical stability and photobleaching resistance and high in ionic strength; the fluorescent carbon dots have double emission peaks of red light and blue light / green light, are different from single fluorescent carbon dots, and can provide more fluorescent information storage density for a fluorescent gel-based information orientation encryption system. The fluorescent color of the fluorescent hydrogel can be stably switched in an ethanol / water solvent, the gel structure is stable, the information storage capacity is improved, and a fluorescent hydrogel-based information anti-counterfeiting encryption system is promoted to develop towards multiple dimensions.

The invention discloses a covalent organic framework material, a preparation method thereof and application of the covalent organic framework material in degrading new pollutants in a water body by activating PMS, the covalent organic framework material contains a pyrene group and a bipyridine linking group, has a flat molecular structure and a laminated nanosheet morphology, and has a regular pore structure; the catalyst has a good crystal structure, reliable mechanical strength and excellent thermal chemical stability and catalytic activity, and is an excellent catalyst; and the subsequent modification and metal atom loading sites exist, so that the possibility is provided for further improving the catalytic activity. The bottleneck problems of low crystallinity and poor stability in the traditional preparation process are solved through solvothermal reaction preparation, use of a mixed solvent system and introduction of a weakly acidic solvent, the preparation method is simple, and large-scale production can be realized. The activated PMS degrades new pollutants in the water body; under the condition that the reaction time is 45 minutes, the degradation rate of the BPA can reach 100%.

The invention discloses an algae-based iron-carbon catalyst as well as a preparation method and application thereof, and relates to the technical field of new material research and development and sewage treatment. The preparation method comprises the following steps: mixing ferrocene, diatomite and a solvent to obtain a mixed solution; adding a hydrogen peroxide solution into the mixed solution, and then heating for reaction to obtain an intermediate; and roasting the intermediate to obtain the algae-based iron-carbon catalyst. According to the invention, ferrocene and diatomite are used as raw materials, and the high-performance algae-based iron-carbon catalyst is prepared through simple solvothermal reaction and roasting treatment. The obtained algae-based iron-carbon catalyst is stable in structure, high in activity and wide in applicable pH range in a persulfate oxidation system, and can be used for activating persulfate to degrade antibiotic pollutants in water.

The invention relates to the technical field of nano-enzymes, and discloses a copper-based nano-enzyme with laccase and peroxidase double-enzyme activity and preparation and application thereof, and the copper-based nano-enzyme is a nano-material prepared by forming MOF through solvothermal reaction of copper ions and diamino terephthalic acid and then performing electrostatic adsorption on the MOF and polyoxometallate. The copper-based nano enzyme has high-efficiency laccase-like activity and peroxidase-like activity at the same time through the combination and synthesis process of the copper ion cluster and the organic ligand. The invention further discloses a preparation method of the copper-based nano-enzyme, peroxidase activity detection and application of the copper-based nano-enzyme to degradation and determination of dichlorophenol. The copper-based nano-enzyme provided by the invention has high catalytic activity and stability, is low in cost and easy to prepare, and can be applied to biosensing detection of hydrogen peroxide and environmental remediation degradation of organic pollutants such as phenols and dyes.

The invention provides a preparation method and application of a CoWO4 / In2O3 composite material, and relates to the technical field of AOP photocatalytic degradation of antibiotics in water. The preparation method of the CoWO4 / In2O3 composite material comprises the following steps: preparing a precursor MIL-68 (In) by adopting a solvothermal reaction and regulating and controlling the reaction temperature and time, then calcining the precursor MIL-68 (In) and CoWO4 prepared by a hydrothermal reaction, and regulating and controlling the calcining temperature and time to prepare the CoWO4 / In2O3 composite material with a proper band gap. The CoWO4 / In2O3 composite material has the advantages of large specific surface area and many defects, is beneficial to promoting the separation and migration rate of photo-induced electrons and holes, reducing the recombination rate of the photo-induced electrons and holes, effectively activating PMS (peroxymonosulfate) to improve the degradation rate and degradation rate of the PMS in tetracycline antibiotics in water, has the TCH degradation rate of 85.16%-90.88%, and can be used for preparing the composite material. And the CoWO4 / In2O3 composite material has excellent stability.

The invention belongs to the technical field of membrane separation, and particularly relates to a polyamide composite membrane containing amino-carboxyl bifunctional COFs as well as a preparation method and application of the polyamide composite membrane. The preparation method comprises the following steps: by taking 1, 3, 5-tri (4-aminophenyl) benzene, 4, 4 '-diaminobiphenyl-2, 2'-dicarboxylic acid and 1, 3, 5-trialdehyde phloroglucinol as monomers, carrying out solvothermal reaction to prepare a bifunctional COFs material rich in amino groups and carboxyl groups at the same time; the preparation method comprises the following steps: dispersing a COFs material in a water phase containing polyamine, and carrying out interfacial polymerization on the water phase and an oil phase containing polyacyl chloride to prepare the composite membrane. COFs are firmly anchored in a polyamide network through a covalent reaction between amino and an acyl chloride monomer, so that the problems that the COFs are easy to fall off and non-uniform in dispersion are solved; the water flux is improved by regular pore channels of COFs, the membrane is endowed with strong hydrophilicity and electronegativity by carboxyl, the desalination rate and the pollution resistance are remarkably enhanced, and the COFs-based composite membrane has a wide application prospect in seawater desalination and high-salinity wastewater treatment.

The invention belongs to the technical field of electrode material recovery, and provides a solvothermal reaction regeneration and repair method and application of a waste lithium iron phosphate positive electrode material. The regeneration and repair method comprises the following steps: stirring and mixing waste lithium iron phosphate and N-methyl pyrrolidone, and sequentially drying and sieving to obtain a positive active material; mixing the positive electrode active material, a lithium source, a reducing agent, organic acid and a solvent, and performing solvothermal reaction to obtain a lithium-supplemented lithium iron phosphate positive electrode active material; and carrying out annealing treatment on the lithium-supplemented lithium iron phosphate positive electrode active material in a reducing gas atmosphere to obtain the structure-repaired lithium iron phosphate material. According to the technical scheme, the electrochemical performance of the waste lithium iron phosphate is effectively improved, the operation is simple, the energy consumption is low, the efficiency is high, a new thought is provided for regeneration and repair of the positive electrode material of the waste lithium iron phosphate battery, and the application prospect is relatively great.

The invention provides a vanadium-based metal organic framework material as well as a preparation method and application thereof, and belongs to the technical field of metal organic framework materials. The vanadium-based metal organic framework material is of a three-dimensional framework structure formed by connecting a one-dimensional vanadium oxygen chain and a squaric acid ligand through coordinate bonds. The preparation method of the vanadium-based metal organic framework material comprises the following steps: adding a vanadium source and an organic ligand into an acidic aqueous solution for solvothermal reaction to obtain the vanadium-based metal organic framework material, and the organic ligand is squaric acid. The vanadium-based metal organic framework material provided by the invention can be used for separating straight-chain alkane and isomers thereof.

This invention belongs to the field of cerium oxide nanomaterials technology, and relates to a hydrophilic cerium oxide nanosphere, its preparation method, and its applications. The hydrophilic cerium oxide nanospheres have a spherical structure with an average particle size of 50-500 nm, and are made of sulfur-doped cerium oxide; the water contact angle of the hydrophilic cerium oxide nanospheres is ≤30°. The preparation method involves mixing cerium salt with an alcohol compound and a hydrophilic modifier, followed by a solvothermal reaction to obtain a cerium-based precursor; under an oxidizing atmosphere, the cerium-based precursor is heated to 500-800℃ for calcination and pyrolysis. The hydrophilic cerium oxide nanospheres provided by this invention incorporate elements such as sulfur, changing the inert surface of cerium oxide to a hydrophilic surface, fundamentally altering the hydrophilic properties of cerium oxide, which is beneficial for improving its dispersion stability in water or alcohol, and shows broad application prospects in catalysis, polishing, luminescence, and ultraviolet absorption.