27 results about "Copper acetylacetonate" patented technology

The invention discloses a bimetallic-based catalyst for promoting CO2 absorption-desorption cycle of an alcohol amine solution as well as a preparation method and application of the bimetallic-based catalyst, an MCM-41 molecular sieve with a high specific surface area and an ordered mesoporous structure is taken as a carrier, Zr (SO4) 2 and copper acetylacetonate are loaded as bimetallic active components, the catalyst has a proper acid site and good surface acidity, and the catalyst can be applied to CO2 absorption-desorption cycle of an alcohol amine solution. The decomposition of bicarbonate ions is accelerated, the fracture bond energy of C-N is reduced, the carbon dioxide desorption performance of MEA and a water-poor system is enhanced, and the energy consumption is reduced. Compared with the prior art, the molecular sieve catalyst is synthesized by adopting a one-step hydrothermal method, and the process is simple; the catalyst is not only suitable for a traditional MEA aqueous solution, but also effective in a novel water-poor amine liquid system, and provides an energy-saving solution for different carbon capture processes. After the catalyst is subjected to five times of absorption-desorption cycles, the catalytic activity of the catalyst can still be kept at 90% or above of an initial value, and good cycle stability is shown.

The application discloses a preparation method of Fe single-atom and Cu cluster co-doped nitrogen-carbon material and application of the material in full-pH oxygen reduction electrocatalysis. The ZIF-8 with a three-dimensional and rich pore structure is used as a framework, and Fe@ZIF-8 is prepared by using a solvothermal method. Then, copper acetylacetonate is used as a copper source, and the copper acetylacetonate molecules dispersed in the gas phase are adsorbed on the surface of the ZIF-8 by using the rich pore structure of the ZIF-8 and the low sublimation temperature of the metal acetylacetonate salt. Finally, pyrolysis is carried out under nitrogen or inert atmosphere, so as to form the Fe single-atom and Cu cluster co-doped nitrogen-carbon material. The material is subjected to electrochemical test under acidic, neutral and alkaline conditions, and the material exhibits high oxygen reduction electrocatalysis performance in the full-pH range and has good stability. The material has good performance as a cathode catalyst in a fuel cell, an alkaline / neutral zinc-air battery, and has high application value.

The application belongs to the technical field of nanomaterials, and provides ascorbic acid oxidation mimetic enzyme and preparation thereof. The application adopts a methanol solution of zinc nitrate, copper acetylacetonate and 2-methyl imidazole to perform a hydrothermal reaction, and obtains the ascorbic acid oxidation mimetic enzyme by oxygen isolation calcination of a hydrothermal product. The copper-nitrogen-carbon nanomaterial obtained by the application has a rhombohedron structure, can specifically oxidize ascorbic acid, and can be applied to ascorbic acid content detection, oxidized ascorbic acid preparation and dehydroascorbic acid preparation as ascorbic acid oxidation enzyme mimetic enzyme. The nanomaterial can maintain ascorbic acid oxidation mimetic enzyme activity under acid, alkaline and high temperature conditions; the steady-state kinetic parameter (Michaelis constant is 0.012 mM) is better than that of natural ascorbic acid oxidation enzyme, and the ascorbic acid oxidation mimetic enzyme activity of the material has a broad application prospect in the fields of nanozyme, nanotechnology and biological analysis detection.

The invention discloses a preparation method and application of a porous iridium nano-metal catalyst, and belongs to the field of material synthesis and electro-catalysis. Iridium acetylacetonate and copper acetylacetonate are used as precursors, an IrCu alloy nanosphere precursor is prepared through solvothermal reaction in an ethylene glycol and surfactant system, copper is removed through acid etching, and the porous iridium nano spherical catalyst (Ir-NS) is obtained. The catalyst has a three-dimensional porous spherical structure, active sites are concentrated on the surfaces of nanospheres and the edges of the walls of internal mesopores, catalytic active sites are enhanced due to the iridium nanosphere structure and uniform site exposure density, oxygen bubbles are quickly released, and the active sites are prevented from being covered by the bubbles. In an acid medium and proton exchange membrane water electrolysis anode oxygen evolution reaction, the catalyst shows low overpotential and long-term operation stability under low iridium loading capacity. The method is simple in process and low in cost, does not need an additional hard template, and has a good industrial application prospect.

The invention discloses a copper-zinc double-active metal site adsorbent with atom dispersion, a preparation method thereof and application of the copper-zinc double-active metal site adsorbent in adsorption of sulfonamide antibiotics. The preparation method comprises the following steps: carrying out solvothermal reaction on a methanol solution containing copper acetylacetonate, zinc acetate and 2-methylimidazole in a mass ratio of (0.12-0.24): (0.8-0.9): (1.3-1.4), taking a solid after the reaction is ended, washing, drying, and calcining in an inert atmosphere to obtain the copper-zinc double-active metal site adsorbent with atom dispersion. The adsorbent has the following prominent advantages that copper and zinc are anchored to a nitrogen-rich carbon skeleton in a monatomic form, copper and copper diatoms exist on the surface, and the utilization rate is high; the synergistic effect of the nitrogen-doped carbon matrix and active sites of copper and zinc endows the material with an adjustable electronic structure; the porous carbon structure provides a stable anchoring point for metal atoms, metal dissolution is effectively inhibited, and secondary pollution is avoided.

The application discloses a carbon dot / copper nanocomposite for a solid propellant combustion catalyst, uses carbon dots and copper acetylacetonate as reaction precursors, uses water and N,N'-dimethylformamide as mixed reaction solvents, reduces divalent copper ions into nanometer copper elements in a hydrothermal process by using the reducing property of the carbon dots, and performs in-situ growth, and finally obtains the carbon dot / copper nanocomposite. The application can effectively exert the synergistic effect of the carbon dots and nanometer metal copper, has high combustion catalytic performance on energetic materials, and can be used for combustion catalysis of the solid propellant.

This invention discloses a PdCu intermetallic compound catalyst, its preparation method, and its application, belonging to the field of electrochemical ammonia synthesis and catalyst preparation technology. The preparation method includes: dispersing palladium acetylacetonate, copper acetylacetonate, glucose monohydrate, a surfactant, and a carbon support in an oleylamine solvent to obtain a mixture; subjecting the mixture to ultrasonic treatment to form a uniform dispersion; subjecting the dispersion to an oil bath reaction; collecting the reaction product, washing, and drying to obtain a PdCu intermetallic compound catalyst supported on a carbon support. The catalyst of this invention achieves approximately 224.25 mgh in the electrocatalytic reduction of nitrate to ammonia under alkaline conditions at -1.3V (vs. RHE). ‑1 mg ‑1 The ammonia yield is high, with a Faraday efficiency of 93.48%. Furthermore, this catalyst can be used as a cathode in zinc-nitrate batteries, achieving both power output and ammonia synthesis, demonstrating promising application prospects.

The invention relates to the technical field of preparation of catalysts, in particular to a solar-driven CO2 conversion molten medium catalyst, a preparation method and application of the solar-driven CO2 conversion molten medium catalyst in a CO2 trapping and separating system, and the solar-driven CO2 conversion molten medium catalyst comprises the following preparation steps: S1, preparing a modified carrier; s2, molten metal is heated to be completely molten, modified molten salt is added, stirring is conducted, and emulsion is obtained; and S3, adding the modified carrier and copper acetylacetonate into the emulsion, carrying out ultrasonic-assisted dispersion in a molten state, cooling, soaking in an ionic liquid, and drying to obtain the catalyst. The synergistic effect of light and heat is realized in a melting system through the synergistic effect of the modified carrier and the modified molten salt, so that electron excitation initiated by light energy and surface reaction kinetics promoted by heat energy supplement each other, the overall conversion efficiency of CO2 is greatly improved, the dual functions of efficient trapping and in-situ catalytic conversion are achieved, and the catalyst has a good application prospect. Complex procedures of separation, compression and storage after CO2 capture in a traditional process are omitted, and the process flow is remarkably simplified.

A dental ceramic blank comprising at least one organic compound, characterized in that the blank has an open-pore ceramic framework, wherein the open-pore ceramic framework is selected from an open-pore dental ceramic framework comprising zirconia, aluminum oxide, a mixed oxide comprising zirconia, and / or silicon carbide, wherein the open-pore ceramic framework contains 2 to 50 wt.% of at least one organic compound selected from a) comprising at least one polymerizable monomer and / or a mixture of polymerizable monomers, thermal initiators comprising peroxide and / or an azo compound or a redox system comprising a peroxide, and a reducing agent selected from ascorbic acid, an ascorbic acid derivative, barbituric acid or a barbituric acid derivative, sulfinic acid, a sulfinic acid derivative or a redox system (aa) barbituric acid or thiobarbituric acid or a barbituric acid or thiobarbituric acid derivative and (bb) at least one copper salt or copper complex and (cc) at least one compound with an ionic halogen atom, particularly preferably a redox system comprising 1-benzyl-5-phenylbarbituric acid, copper acetylacetonate and benzyldibutylammonium chloride, and / or b) a polymer of the aforementioned monomers polymerized in the blank with respect to the overall composition of the dental ceramic blank.

The invention discloses a preparation method and application of an iron-copper diatomic nano-enzyme, and relates to a preparation method and application of a nano-enzyme. The invention aims to solve the problem that the clinical application of the traditional treatment means is often limited and challenged by severe systemic toxicity, drug resistance and tumor recurrence although the traditional treatment means improve the survival rate of patients. The method comprises the following steps: 1, dissolving dimethylimidazole in absolute methanol, and stirring to obtain a solution A; step 2, dissolving zinc nitrate hexahydrate, ferric ammonium citrate and copper acetylacetonate in absolute methanol, and stirring to obtain a solution B; 3, mixing and stirring the solution A and the solution B, centrifuging, washing and drying to obtain a white sample ZIF-8; and step 4, pyrolyzing the white sample ZIF-8 at 900 DEG C to obtain black powder, namely the iron-copper diatomic nano-enzyme. The invention belongs to the technical field of active oxygen mediated tumor treatment.

A preparation method of the high-entropy alloy catalyst comprises the following steps: S1, weighing ferric acetylacetonate, cobalt acetylacetonate, nickel acetylacetonate, copper acetylacetonate and molybdenum acetylacetonate according to an equal molar ratio as metal sources, and then adding ketjen black; s2, dispersing the mixture in a mixed solvent of acetone and ethylene glycol, continuously stirring until the system is uniformly mixed, and carrying out solvothermal reaction at the temperature of 200-220 DEG C for 24-36 hours; and S3, after the reaction is finished, collecting a product through centrifugal separation, and drying to obtain the product. According to the composite material, the conversion kinetics and the actual utilization rate of active substances in the zinc-iodine battery can be obviously improved, the shuttle effect is effectively inhibited, electron transmission is accelerated by virtue of the excellent conductivity of Ketjen black, and the cycling stability and the rate capability of the zinc-iodine battery are obviously improved.

The application discloses a one-dimensional carbon-coated copper selenide nanowire coaxial heterostructure material, a preparation method and application thereof. The preparation method comprises the following steps: adopting a vacuum chemical vapor transport method to heat and decompose copper acetylacetonate under a sealed condition to form a carbon-coated copper nanowire material, and then performing annealing treatment to obtain a one-dimensional carbon-coated copper nanowire material; and adopting a chemical vapor deposition method to perform selenization on the one-dimensional carbon-coated copper nanowire material by using a selenium source to obtain a one-dimensional carbon-coated copper selenide nanowire coaxial heterostructure material. The one-dimensional carbon-coated copper selenide nanowire coaxial heterostructure material is synthesized by using a vacuum chemical vapor transport and secondary selenization method, and the preparation efficiency is improved. Meanwhile, the one-dimensional structure of the one-dimensional carbon-coated copper selenide nanowire material has a relatively high specific surface area, and the external carbon layer improves the electronic conductivity and stability of the copper selenide, and the one-dimensional carbon-coated copper selenide nanowire material has a relatively high charge and discharge specific capacity.

The invention discloses a gold-copper intermetallic compound superlattice array and a preparation method and application thereof. The preparation method comprises the following steps: firstly, preparing gold nanoparticles; then adding a toluene solution of oleylamine into the gold nanoparticles, mixing and oscillating, taking an upper layer oleylamine phase, and standing; dissolving copper acetylacetonate in an oleylamine solution, and adding the upper oleylamine phase for reaction to obtain gold-copper nanoparticles; and adding oleic acid into the gold-copper nanoparticles for modification to form superlattices, dropwise adding the superlattices into a diethylene glycol solution, and naturally evaporating to obtain the gold-copper intermetallic compound superlattice array. A gold-copper intermetallic compound is synthesized by adopting a high-temperature hydrothermal method, an atomic-scale long-range ordered structure is synthesized, functional molecules such as oleylamine and oleic acid are modified, a long-range ordered periodic structure is spontaneously arranged under non-covalent interaction, an electron energy band structure, carrier transport efficiency and light absorption characteristics can be regulated and controlled, and the photoelectric conversion efficiency is improved. The method has wide application potential in multiple fields.

The invention discloses a benzenediol synthesis catalyst with a high para-ortho ratio under a mild condition as well as a preparation method and application of the benzenediol synthesis catalyst. The preparation method comprises the following steps: providing a SiO2 nanosphere solution prepared from tetraethyl silicate; dopamine hydrochloride and copper acetylacetonate are sequentially added into the SiO2 nanosphere solution, stirring reaction is carried out, the mass ratio of the dopamine hydrochloride to the tetraethyl silicate is 0.1-0.15, and the molar ratio of the copper acetylacetonate to the tetraethyl silicate is 0.04-0.14; centrifuging, washing and drying the reaction product; carrying out high-temperature carbonization treatment in a nitrogen atmosphere, wherein the flow rate of nitrogen is controlled within a range of 20-60 mL / min; and grinding the carbonized sample to obtain the SiO2 coated C / Cu catalyst.

The present application relates to the technical field of high polymer coating, and discloses an anti-adhesion steel formwork coating and a preparation method thereof, the coating is prepared by mixing and curing an A agent and a B agent; the A agent contains, in terms of weight parts, 100 parts of bisphenol A type liquid epoxy resin, 10-15 parts of long-chain aliphatic mono-epoxy active diluent, 5-8 parts of mixed solvent, 0.8-2.0 parts of zinc acetylacetone and 0.05-0.15 parts of copper acetylacetone; and the B agent is 45-64 parts of siloxane modified phenolic amine prepolymer. By covalently anchoring the siloxane chain segment in the crosslinked network, the loss of the anti-adhesion substance is avoided; the coordination steric hindrance effect of zinc ions is used to inhibit the initial reaction heat release, thereby prolonging the pot life; the long-chain aliphatic diluent constructs a hydrophobic shielding layer to block the penetration of strong alkali ions, thereby improving the saponification life; and the dynamic color change mechanism of the copper acetylacetone provides an intuitive indication for material mixing and dry state.

The invention belongs to the technical field of organic synthesis, and discloses a synthesis method of N, N '-diphenyl-N, N'-bis (4-methylphenyl)-4, 4 '-biphenyl diamine. According to the method, 4-methyldiphenylamine and 4, 4 '-dibromodiphenyl are taken as raw materials, copper acetylacetonate is taken as a catalyst, N, N'-bis (4-hydroxy-2, 6-dimethyl phenyl) amide is taken as a ligand, potassium hydroxide is taken as alkali, dimethyl sulfoxide is taken as a solvent, and a coupling reaction is carried out at 100-120 DEG C in an inert atmosphere. And after the reaction, carrying out post-treatment including acid regulation, methanol precipitation, toluene dissolution, activated carbon decoloration and recrystallization to obtain the high-purity p-TPD. The cheap catalyst and ligand are adopted, the dosage is only 0.5 mol%, the reaction temperature is mild, operation is easy and convenient, the molar yield reaches up to 91.3%, the production cost is remarkably reduced, the method is suitable for industrial production, and an efficient synthesis approach is provided for organic photoelectric materials.

The invention relates to a preparation method and application of a copper-manganese double-site composite catalyst. The method adopts a two-step sequential construction method, and comprises the following steps: firstly, stably anchoring Mn monatomic sites on C3N4 (at) CNT through a high-temperature pyrolysis-pickling process, so as to form Mn1-C3N4 (at) CNT; then, a CuOx cluster is selectively loaded on the precursor through a solvothermal reaction; wherein ethylene glycol is used as a solvent and a reducing agent, copper acetylacetonate is used as a copper source, it is ensured that a small-size CuOx cluster is controllably formed on the surface with the Mn-N4 structure, strong electron interaction between the small-size CuOx cluster and the copper acetylacetonate is established, and the proximity and the synergistic effect of Cu and Mn sites are achieved. The catalyst obtained by the invention has a remarkable effect when being applied to synthesis of urea by coupling carbon dioxide and nitrite C-N.

The invention relates to the technical field of carbon material preparation, in particular to a copper / nickel-nitrogen-carbon double-atom catalyst and a preparation method and application thereof.The preparation method includes the steps that copper acetylacetonate and nickel acetylacetonate serve as metal sources, polyacrylonitrile serves as a spinning aid, N, N-dimethylformamide serves as a solvent, polystyrene serves as a pore-foaming agent, the materials are mixed to be uniform and then magnetically stirred for 8 h, and a mixture is obtained; and carrying out electrospinning, placing the obtained film in a carbonization furnace, carrying out air pre-oxidation, and then heating in an argon atmosphere to prepare the copper / nickel-nitrogen-carbon diatomic catalyst. The prepared copper / nickel-nitrogen-carbon double-atom catalyst has an adjustable copper and nickel atom coordination environment, modulation of the copper and nickel metal coordination environment can be achieved by controlling the proportion of copper and nickel metal precursors, and the copper / nickel-nitrogen-carbon double-atom catalyst has excellent catalytic performance.

The present application relates to a kind of mesoporous carbon composite material and its preparation method and application.Mesoporous carbon composite material includes nitrogen-doped hollow mesoporous carbon and metal monatomic atom loaded on the nitrogen-doped hollow mesoporous carbon.The present application also provides the preparation method of mesoporous carbon composite material, including: adding 3-amino phenol and formaldehyde into alkali water, then adding the mixed solution of organic solvent and alkali, then adding cetyltrimethylammonium bromide, ethyl silicate and N, N-dimethylformamide in sequence, the product is calcined in nitrogen atmosphere, then mixed with the mixed solution of copper acetylacetonate and organic solvent, add in acetone solution, after ultrasonic heating reaction, calcined in nitrogen atmosphere, obtain mesoporous carbon composite material.The present application also provides the application of mesoporous carbon composite material as catalyst.The present application solves the problem of low degradation efficiency of existing catalyst, also solves the problem of large amount of existing catalyst.

The invention discloses a high-entropy alloy nano-enzyme as well as a preparation method and application thereof. Belongs to the technical field of metal functional material preparation. Specific acetylacetone non-noble metal salts (iron acetylacetonate, cobalt acetylacetonate, nickel acetylacetonate and copper acetylacetonate) are matched with acetylacetone noble metal salts, meanwhile, the preparation method is optimized, and the high-entropy alloy nano-enzyme is processed at the specific heating temperature per minute during annealing. The small-size high-entropy alloy nano-enzyme with a specific structure is successfully prepared, the catalase activity, the peroxidase-like activity, the photo-thermal conversion capacity, the active oxygen generation capacity and the tumor targeted killing capacity of the high-entropy alloy nano-enzyme are improved, and technical support is provided for development of the high-performance multifunctional high-entropy alloy nano-enzyme.

The application discloses a kind of metal organic framework composite material and its preparation method and application, preparation method includes: preparation includes uniform benzene trimellitic acid, polymer and first solvent spinning fluid, electrostatic spinning is carried out, obtains fiber or fiber membrane, it is immersed in copper acetylacetonate solution, reaction, generates metal organic framework composite material;The reaction time of control reaction is greater than or equal to 60min, copper acetylacetonate solution is prepared by dispersing copper acetylacetonate in second solvent;The method can make metal organic framework (Cu-BTC) on the surface of polymer fiber with mild conditions Realize heterogeneous nucleation and the high load controlled growth of hexagonal flaky crystal form, crystal structure defect is less, it is favorable to improve the performance of composite material, and then it is favorable to be applied in preparation of heterogeneous catalytic material, drug delivery material, gas adsorption material or environmental remediation material.

The application provides a single-crystal zinc negative electrode, a preparation method and application thereof in assembling high-performance zinc batteries. The preparation of the single-crystal zinc negative electrode comprises the following steps: step S1, cutting, cleaning and drying brass foil to obtain a brass foil substrate; step S2, placing the brass foil substrate in the center area of a tube furnace, and preparing reactants copper acetylacetonate and tetrachloroquinone; step S3, introducing inert gas into the tube furnace, raising the furnace temperature to 300-500 DEG C, and keeping for 1.5-2.5 hours to drive the deposition reaction of the Cu3(C6O6)2 film, after the reaction is completed, cooling to room temperature, and taking out the brass foil substrate with the synthesized Cu3(C6O6)2 film; and step S4, assembling the brass foil substrate with the synthesized Cu3(C6O6)2 film in a button cell as a working electrode, and depositing a zinc layer on the surface of the Cu3(C6O6)2 film by an electrodeposition method to obtain a single-crystal zinc negative electrode with a single crystal surface exposure.

The application discloses a kind of gold copper intermetallic compound superlattice array and its preparation method and application, first gold nanoparticles are prepared;Then add the toluene solution of oleylamine to gold nanoparticles, after mixing and oscillation, take the upper oleylamine phase and stand;Acetylacetone copper is dissolved in oleylamine solution, is added to the upper oleylamine phase and is reacted to obtain gold copper nanoparticles;Oleic acid is added to gold copper nanoparticles to form superlattice by modification, then drop into diethylene glycol solution, and obtain the gold copper intermetallic compound superlattice array by natural evaporation.The gold copper intermetallic compound of the application is synthesized by high-temperature hydrothermal method, and atomic-level long-range ordered structure is synthesized, by modifying functional molecules such as oleylamine and oleic acid, under non-covalent interaction, spontaneously arranged into long-range ordered periodic structure, with adjustable electronic band structure, carrier transport efficiency and light absorption characteristics, with wide application potential in many fields.

The invention discloses a preparation method of an alkynyl bicyclo [3.1. 1] heptane difluoroacetate compound in the technical field of organic synthesis, which comprises the following steps: by taking terminal alkyne, [3.1. 1] propeller alkane and gem-difluorobromoacetate as initial raw materials, under the condition that the stoichiometric copper acetylacetonate and 1, 8-diazabicyclo [5.4. 0] undec-7-ene (DBU) are taken as alkalis and acetonitrile is taken as a solvent, carrying out a reaction on the initial raw materials to prepare the alkynyl bicyclo [3.1. 1] heptane difluoroacetate compound. The reaction is carried out through a one-pot method. The process comprises the following key steps: firstly, generating high-activity gem-difluoroacetate free radicals from gem-difluorobromoacetate; the free radical and high-tension [3.1. 1] propeller alkane are subjected to ring-opening addition, ring tension is released, and a new carbon center free radical intermediate is generated; the intermediate is then captured by alkynyl copper species generated in situ, and finally a target product is obtained through reduction elimination. The method is mild in reaction condition and wide in substrate universality, the problems of tedious synthesis steps and low efficiency in the prior art are solved, and a novel and efficient way is provided for preparation of the important molecules.

The application discloses a Pd-Cu-M / alpha-Si3N4 supported metal catalyst and a preparation and application thereof. The preparation method comprises the following steps: step 1): dissolving palladium acetylacetone, copper acetylacetone and acetylacetone salt of metal M in a solvent to prepare a precursor solution, adding an alpha-Si3N4 carrier, and fully stirring to obtain a suspension; the metal M is a rare earth metal element; step 2): transferring the suspension obtained in step 1) into a polytetrafluoroethylene-lined steel autoclave, sealing in an induction heating electric furnace for heating, and cooling to room temperature; step 3): centrifuging the suspension cooled in step 2) to collect the solid, washing and drying the solid, and obtaining the Pd-Cu-M / alpha-Si3N4 supported metal catalyst after the drying is completed. The application provides the application of the catalyst in a low-temperature hydrogen catalytic oxidation reaction, and the catalyst has high hydrogen conversion rate and excellent stability.

The invention discloses a carbon-doped tubular carbon nitride supported monatomic copper catalyst and a preparation method and water treatment application thereof, the preparation method comprises the following steps: mixing melamine, urea and water, and sequentially carrying out hydrothermal reaction and first calcination to obtain tubular carbon nitride; and mixing the tubular carbon nitride and copper acetylacetonate, and carrying out secondary calcination to obtain the carbon-doped tubular carbon nitride loaded monatomic copper catalyst. The carbon-doped tubular carbon nitride loaded monatomic copper catalyst disclosed by the invention has the advantages of high specific surface area, high copper atom loading capacity, rich active sites, high catalytic activity, strong adaptability, excellent long-term stability and the like, and can be widely applied to treatment of organic pollutant (such as acetaminophen) wastewater; the method has high practical value and good application prospect.

This invention discloses a HEOs / SnO2 nanocomposite material and a gas sensor based thereon. The preparation method is as follows: HEOs (high entropy oxide) powder is prepared by solvothermal reaction and high-temperature calcination using manganese(II), iron(III), cobalt(III), nickel(II), and copper(II) acetylacetone as precursors; the HEOs powder is then ultrasonically combined with SnO2 powder to obtain the HEOs / SnO2 nanocomposite material. The gas sensor of this invention uses the HEOs / SnO2 nanocomposite material as the gas-sensitive material, effectively solving the technical problems of low response and poor selectivity in traditional metal oxide sensors. At a relatively low operating temperature of 130℃, the response value to 0.5 ppm nitrogen dioxide can reach 747 (R0). g / R a It combines high responsiveness, strong selectivity and excellent stability, and has great application potential in the field of low temperature and low concentration NO2 monitoring.