64 results about "Copper nitrate" patented technology

The application provides an in-situ liquid gel-forming water-retaining agent and a preparation method and application thereof. The water-retaining agent is composed of A component and B component which are applied in steps. The A component contains an aqueous solution of a natural modified polymer, and the natural modified polymer is selected from one or two of carboxymethyl chitosan, carboxymethyl cellulose or a sodium salt thereof. The B component contains an aqueous solution of a cationic crosslinking agent, and the cationic crosslinking agent is selected from one or more cations of copper nitrate, iron nitrate, zinc nitrate, manganese nitrate, chitosan quaternary ammonium salt, calcium nitrate and magnesium nitrate. The water-retaining agent can realize the integrated functions of slow release of trace elements, water retention, soil improvement and precise nutrition supply. Furthermore, the water-retaining agent is applied to crop growth in combination with the "step-by-step drip irrigation and in-situ gel formation" technology, so that the agronomic characters of crops can be significantly improved.

This invention provides a method for preparing copper powder from copper nitrate-containing wastewater. The method includes: mixing a reducing agent and a dispersant to obtain a first solution; adding copper nitrate-containing wastewater to the first solution to obtain a second solution; ultrasonically treating the second solution; and performing solid-liquid separation to obtain the copper powder. This invention utilizes ultrasound assistance to improve reaction efficiency, and through precise control of reaction conditions, achieves a copper recovery rate of over 99% from the copper nitrate-containing wastewater, obtaining copper powder with a purity of 5N.

The present application provides a kind of catalyst for preparing furfuryl alcohol by furfural hydrogenation, its preparation method and its application in preparing furfuryl alcohol by furfural hydrogenation.The preparation method of the present application comprises the following steps: under stirring condition, water is added to aluminum isopropyl alcohol;After stirring reaction, filtration, washing, drying, then high temperature calcination is obtained to obtain alumina;Alumina is immersed in copper nitrate solution, impregnation is stirred, dried, calcined reduction to obtain catalyst.The catalyst of the present application is Cu-Al catalyst, the preparation method of catalyst is simple, green and environmentally friendly, and the cost is low;The obtained catalyst is applied to the preparation of furfuryl alcohol by furfural hydrogenation, so that the reaction can be carried out at lower reaction temperature and lower reaction pressure, and furfuryl alcohol can be prepared with high conversion rate and high selectivity, the conversion rate of furfural can reach 100%, and the selectivity of furfuryl alcohol can reach 100%.

This invention belongs to the field of hydrogenation catalyst technology, specifically relating to a Pd-Cu bimetallic catalyst, its preparation method, and its application. Using palladium nitrate and copper nitrate as metal sources, 2-methylimidazole as an organic ligand, and SiO2 as a support, a metal-organic framework precursor is constructed via a solvothermal method. This precursor is then subjected to a two-step heat treatment process: N2 atmosphere pyrolysis and air atmosphere calcination, yielding a PdxCu@SiO2 catalyst with an adjustable Pd / Cu molar ratio. The Cu loading is 4.0 wt.%, and the Pd loading is 0.5~5.5 wt.%. This invention features a mild and easily controllable process, allowing for precise optimization of the catalyst's active site structure. The SiO2 support effectively improves the catalyst's dispersibility and stability. The resulting catalyst exhibits excellent performance in CO2 hydrogenation to methanol, with a maximum CO2 conversion rate of 16.3%, a methanol selectivity of 64.5%, and a space-time yield approximately 18.5 times higher than that of the traditional impregnation method, while also demonstrating excellent long-term operational stability.

This invention belongs to the field of inorganic catalyst materials and organic pollutant degradation technology, specifically relating to a Cu@ITGs confined microsphere catalytic material based on iron tailings, its preparation method, and its application in degrading organic matter. The method includes the following steps: mixing activated iron tailings powder and meta-high terephthalic acid to obtain a mixed dry powder; obtaining a composite alkali activator; weighing copper nitrate particles, dispersing them in ethanolamine for complexation, and slowly adding them to the composite alkali activator to obtain a mixed solution; adding the mixed dry powder to the mixed solution to synthesize a gel slurry; dripping the obtained gel slurry into polyethylene glycol-800 to form microspheres; and after fully curing and drying the microspheres, gradient calcining under a N2 atmosphere to obtain the confined catalytic material Cu@ITGs. This invention uses bulk industrial solid waste as the main raw material to prepare a multifunctional catalytic material with both high catalytic activity and excellent stability for use in wastewater treatment, realizing "waste-to-waste" treatment and high-value-added resource utilization of solid waste.

Provided is a separator used for a secondary battery. The separator may comprises a complex-containing layer which is provided on a surface in contact with a negative electrode of the secondary battery and which contains an electrolyte complex. The electrolyte complex may contain a nitrate and a coordination substance. The nitrate may include at least one selected from lithium nitrate, potassium nitrate, cesium nitrate, sodium nitrate, silver nitrate, calcium nitrate, zinc nitrate, copper nitrate, magnesium nitrate, indium nitrate, aluminum nitrate, ammonium nitrate, barium nitrate, and iron nitrate.

The application discloses a preparation method of a copper oxide loaded tricobalt tetroxide catalyst and application of the catalyst in catalytic combustion of diesel vehicle exhaust soot. The application adopts a hydrothermal synthesis method to prepare a tricobalt tetroxide carrier, then uses an equal-volume impregnation method to load copper nitrate trihydrate on the tricobalt tetroxide carrier, and finally obtains the catalyst by calcining after low-temperature drying. The application has the advantages of large specific surface area, rich oxygen vacancies, remarkable interface synergistic effect and the like, the catalyst T 50 The combustion conversion temperature is obviously reduced, the capacity of oxygen molecule activation and reactant adsorption is improved, the catalyst interface induces the formation of Cu + ‑O V ‑Co 3+ active sites, has superior O2 affinity, efficiently activates and adsorbs O2, the interface interaction of CuO-Co3O4 weakens the Co-O bond, and improves the activity of lattice oxygen. The catalyst is used for purifying soot particulate matters of diesel vehicle emissions, and has progressive significance for atmospheric environment protection and human health.

A gas generant composition for passive inflatable restraint systems (e.g., airbags) for automobiles is provided that comprises a melamine oxalate compound. The gas generant may be a cool burning gas generant composition that comprises a melamine oxalate compound, a co-fuel, such as guanidine nitrate, and an oxidizer, such as basic copper nitrate. The gas generant composition has advantageous combustion properties, including a maximum flame temperature at combustion (Tc) of ≤about 1700K (1,427° C.), a linear burn rate of ≥about 18 mm per second at a pressure of about 10 megapascals (MPa), a gas yield of the gas generant composition of ≥about 5.7 moles / 100 cm3, and a linear burn rate pressure exponent of ≤about 0.35.

The application discloses a culture medium and a process method for reducing cell lactic acid accumulation, which is based on a cell basic culture medium, and after removing original copper ion compounds and DTPA, nitrilotriacetic acid, citric acid and histidine in the basic culture medium, contains the following components and concentration ranges: copper chloride 0.2-0.5 mg / L, copper nitrate 0.2-0.5 mg / L, copper sulfate 0.2-0.5 mg / L, diethylene triamine pentaacetic acid 1-5 mg / L, nitrilotriacetic acid 1-5 mg / L, citric acid 1-5 mg / L, and histidine 0.5-3 g / L; the mass concentration ratio of the copper chloride, the copper nitrate and the copper sulfate is 1:1-5:1. Compared with the prior art, the application has the advantages that: compared with the prior art, the culture medium of the application can inhibit lactic acid generation and promote lactic acid oxidation and decomposition through the synergistic effect of copper ions, chelating agents and metabolism-related substances, and the effect of reducing lactic acid accumulation is remarkable.

This application relates to the field of electrical contact materials technology, and discloses an arc-erosion resistant copper-silver contact alloy and its preparation method. The method includes mixing silver nitrate, copper nitrate trihydrate, yttrium nitrate hexahydrate, ethylenediaminetetraacetic acid (EDTA), and ammonia to obtain a fully ammonium-state, double-complexed, homogeneous initial mother liquor; pumping ammonium bicarbonate aqueous solution into the fully ammonium-state, double-complexed, homogeneous initial mother liquor and injecting anhydrous ethanol for dynamic coupling co-precipitation; washing with an ethanol-water mixture and anhydrous ethanol and vacuum drying to obtain precursor powder; and after oxidative calcination and hydrogen reduction, cold isostatic pressing and solid-phase densification sintering to obtain the arc-erosion resistant copper-silver contact alloy. This invention avoids the introduction of alkali metal impurities, eliminates the risk of arc reignition, achieves uniform co-precipitation of multi-component metal ions, suppresses the outward splashing of liquid metal, and improves the density and arc-erosion resistance of the arc-erosion resistant copper-silver contact alloy.

The application relates to the technical field of sodium ion battery positive electrode materials, in particular to an aluminum-driven lattice-regulated high-performance layered sodium ion battery positive electrode material and a preparation method and application thereof, and comprises the following steps: sequentially dissolving sodium acetate, aluminum nitrate, ferric nitrate, manganese sulfate and copper nitrate in deionized water, adding a modified liquid to form a solution A after mixing, dissolving citric acid in deionized water to form a solution B, adding the solution B into the solution A drop by drop to carry out a gel reaction to obtain a mixed solution, stirring and reacting for 4-5 hours to obtain a gel, carrying out drying treatment on the gel, grinding, pre-sintering, tabletting and then high-temperature calcining to obtain an aluminum-doped layered sodium ion battery positive electrode material. 3+ The Al-O bond energy formed with oxygen is significantly higher than that of the transition metal-oxygen bond, can serve as a structural anchor point in the lattice skeleton, inhibits the Jahn-Teller distortion, layer slip and phase change of transition metal ions in the charging and discharging process, and avoids lattice collapse and structure pulverization.

The application discloses a high-selectivity catalyst for gas-phase aldehyde hydrogenation to alcohol and a preparation method thereof. The method comprises the following steps: firstly, an aluminum source, a magnesium source, a template agent and water are mixed to prepare a first salt solution, and then the first salt solution and a precipitating agent are subjected to parallel flow precipitation to form a first precipitate; secondly, copper nitrate, zinc nitate and water are mixed to prepare a second salt solution, and then the second salt solution and the precipitating agent are dropped into the precipitate prepared in the first step by means of differential parallel flow co-precipitation; and thirdly, the mixture obtained after co-precipitation in the first step and the second step is uniformly mixed, and then is subjected to aging under stirring, so that the first precipitate is completely neutralized, and then a heat-conducting additive is added. The catalyst prepared by the method has high specific surface area and high pore volume, the mass transfer and heat transfer efficiency is improved, the side reaction is reduced, meanwhile, the zinc oxide coating part of the copper oxide weakens the generation of C16 ester, and the selectivity and conversion rate of the gas-phase aldehyde hydrogenation reaction are further improved.

The present application relates to the technical field of high polymer antibacterial health protection materials, in particular to a preparation method of a universal copper-based nanometer material, wherein copper hydroxide precipitate is obtained by adding sodium hydroxide solution into copper chloride water solution step by step, and then copper oxide nanoparticles are obtained by drying and grinding; copper nitrate trihydrate, lithium hydroxide monohydrate and water are mixed and then hydrothermally dispersed to obtain copper hydroxide nanowires; copper chloride dihydrate, lithium hydroxide monohydrate and water are mixed to obtain copper oxide nanosheet; finally, copper oxide nanoparticles, copper hydroxide nanowires and copper oxide nanosheet are dispersed and mixed to obtain a copper-based nanometer compound. The present application is a new type of copper-based nanometer antibacterial material with regular prism / rod microstructure, high dispersibility, strong base material compatibility, high temperature resistance and excellent durability. The material can be truly embedded in different base materials instead of only staying on the surface, and can be universally applied in various material systems such as silica gel, latex and yarn.

This invention provides a method for preparing, a product of, and the application of rose-shaped basic copper nitrate Cu4(NO3)2(OH)6. The preparation method employs a polyol-mediated process, followed by centrifugation to separate nanoparticles from the solvent, and drying to obtain basic copper nitrate Cu4(NO3)2(OH)6. This preparation process is simple, the reaction conditions are mild, and the product quality is highly controllable, making it suitable for industrial production. The Cu4(NO3)2(OH)6 prepared by this method exhibits a unique rose-shaped three-dimensional hierarchical porous structure. Its large specific surface area and open framework facilitate mass transfer of reactants; simultaneously, its abundant pores enable high-density exposure of active sites and the construction of a confined reaction microenvironment. This catalyst exhibits excellent C2 content in the electrocatalytic CO2 reduction reaction. 2+ It exhibits high product selectivity with a Faraday efficiency of up to 76.7%, while effectively suppressing competitive hydrogen evolution reactions and reducing the formation of hydrogen byproducts.

The application discloses a lithium-carbon fluoride battery electrolyte and application, and belongs to the technical field of lithium / carbon fluoride primary batteries. The lithium-carbon fluoride battery electrolyte comprises lithium salt, solvent and NO3 ‑ additive; the solvent comprises high dielectric constant solvent, ether solvent and nitrogen heterocyclic crown ether solvent; the NO3 ‑ additive is at least one of lithium nitrate, copper nitrate, ammonium nitrate, potassium nitrate, sodium nitrate, barium nitrate, zinc nitrate, lead nitrate, nickel nitrate, magnesium nitrate, calcium nitrate, strontium nitrate and cesium nitrate; the NO3 ‑ additive has a mass fraction of 5% to 20%. The high-concentration nitrate additive is introduced to form a protective layer on the surface of the lithium metal negative electrode, thereby inhibiting the side reaction of the lithium metal and the solvent and accelerating the Li + transporting effect, thereby reducing the polarization phenomenon during battery discharging; the nitrogen heterocyclic crown ether can promote the dissolution of the high-concentration nitrate and the lithium fluoride of the positive electrode in the battery discharging process, reduce the polarization of the battery and improve the energy density of the battery.

A method for preparing FeCuMOF nanozymes and a detection method based on FeCuMOF nanozymes are disclosed, relating to the field of nanozyme sensing and detection technology. Preparation method: S11, ferric chloride hexahydrate and copper nitrate are added to N,N-dimethylformamide and stirred until dissolved; S12, terephthalic acid is added and stirred; S13, anhydrous ethanol, ultrapure water, and triethylamine are added, stirred, and the precipitate is collected; S14, the precipitate is washed and dried to obtain FeCuMOF nanozymes. Detection method: S21, standard solutions of multiple concentrations are prepared; S22, standard reaction systems and blank control systems of different concentrations are constructed; S23, the absorbance values ​​of the standard reaction systems and blank control systems are detected; S24, a standard curve is constructed; S25, a sample detection system is constructed; S26, the absorbance value of the sample detection system is detected, and the concentration in the sample is determined according to the standard curve. This invention can solve the technical problems in the prior art where insufficient catalytic activity and selectivity of nanozymes limit their application in detection.

The application provides a catalyst for synergistically removing toluene and NOx, a preparation method and application thereof, and belongs to the technical field of atmospheric pollution control. The catalyst comprises a MnCuTi mixed oxide, has a particle size of 250-380 mu m, a specific surface area of 155.10-164.25 m 2 / g, a pore volume of 0.270-0.281 cm 3 / g, and an average pore size of 6.672-6.951 mm. The preparation method comprises the following steps: mixing copper nitrate, manganese nitrate solution, deionized water and glacial acetic acid with ethanol to obtain solution A; dissolving tetrabutyl titanate in ethanol to obtain solution B; adding solution B into solution A drop by drop under stirring to form a sol and continuing to stir; aging, drying, grinding and calcining; and tabletting and sieving to obtain the catalyst. The catalyst is used for synergistically removing toluene and NOx, has low raw material cost, simple and controllable preparation process, strong repeatability, good catalytic activity and high selectivity.

This invention discloses a method for synthesizing lanthanide-dominated high-entropy alloys and their application in the electrochemically induced polymerization of tetracycline-based pollutants, belonging to the fields of environmental functional materials and advanced wastewater treatment technology. Using lanthanum nitrate, cobalt nitrate, nickel nitrate, copper nitrate, and manganese nitrate as metal sources, and citric acid as a complexing and reducing agent, a high-entropy alloy powder with a single solid solution phase of La-Co-Ni-Cu-Mn is prepared through a sol-gel combined with inert atmosphere high-temperature calcination. The working electrode, prepared by coating this powder onto a conductive substrate, can be used for the electrochemically induced polymerization and transformation of tetracycline-based pollutants (such as chlortetracycline, tetracycline, and doxycycline). At low current densities, this electrode can rapidly convert tetracycline-based pollutants in water into insoluble polymers, achieving efficient and thorough removal of pollutants through simple filtration, effectively avoiding the drawbacks of traditional mineralization technologies such as high energy consumption, easy generation of toxic intermediate products, and CO2 emissions. This invention provides a green, efficient, and universally applicable new material and method for the advanced treatment of antibiotic-containing wastewater.

The application relates to the technical field of sodium ion battery positive electrode materials, in particular to an aluminum-driven lattice-regulated high-performance layered sodium ion battery positive electrode material and a preparation method and application thereof, and comprises the following steps: sequentially dissolving sodium acetate, aluminum nitrate, ferric nitrate, manganese sulfate and copper nitrate in deionized water, adding a modified liquid to form a solution A after mixing, dissolving citric acid in deionized water to form a solution B, adding the solution B into the solution A drop by drop to carry out a gel reaction to obtain a mixed solution, stirring and reacting for 4-5 hours to obtain a gel, carrying out drying treatment on the gel, grinding, pre-sintering, tabletting and then high-temperature calcining to obtain an aluminum-doped layered sodium ion battery positive electrode material. 3+ The Al-O bond energy formed with oxygen is significantly higher than that of the transition metal-oxygen bond, can serve as a structural anchor point in the lattice skeleton, inhibits the Jahn-Teller distortion, layer slip and phase change of transition metal ions in the charging and discharging process, and avoids lattice collapse and structure pulverization.

This invention relates to catalyst preparation methods and wastewater treatment technology, specifically to a method for preparing a pine needle biochar-supported iron-copper bimetallic catalyst and its application in the degradation of phenol. The preparation method is as follows: Pine needle biochar (PBC) is obtained by ultrasonic acid washing, drying, grinding, and sieving using waste pine needles as raw material; ferric nitrate, copper nitrate, and PBC are mixed at a preset mass ratio to form a precursor suspension; citric acid solution is then added for metal coordination, followed by water bath evaporation to form a gel; after drying, the precursor is obtained and then calcined at 800 °C for 4 h under N2 atmosphere. By adjusting the ratio of copper component to PBC, a Fe1Cu4@PBC (1:2) catalyst with optimal degradation performance is obtained. This system has a wide applicable pH range (3~11) and can efficiently activate H2O2 to degrade common pollutants such as phenol, rhodamine B, methylene blue, and malachite green within 6 min. After 6 cycles, the degradation efficiency remains at 100%, and the metal leaching concentration is lower than the drinking water standard limit. The catalyst of this invention solves the problems of narrow pH adaptation range and limited catalytic activity of existing heterogeneous Fenton catalysts, and has the advantages of simple preparation, low cost, good stability, easy recovery and great potential for engineering applications.

The application relates to the technical field of fastener processing, and particularly discloses a processing technology of high-strength bolts. The processing technology of high-strength bolts comprises the following steps: pickling a steel wire rod, washing with water, blowing dry, immersing in a phosphating working solution, soaking, taking out, washing with water, blowing dry, immersing in a saponification lubricating working solution, soaking, taking out, washing with water, blowing dry, wire drawing, cold upsetting forming, wire twisting and screwing, quenching, tempering, and obtaining a high-strength bolt; the phosphating working solution is mainly made of the following raw materials: water, phosphoric acid, concentrated nitric acid, zinc oxide, sodium nitrite, manganese nitrate, copper nitrate, a corrosion inhibitor and a complexing agent. The processing technology utilizes the phosphating working solution to form a uniform, complete and tough phosphating film, improves the hardness and compactness, makes the phosphating film have the characteristics of high hardness and small grain size, is beneficial to subsequent wire drawing, cold upsetting forming and wire twisting and screwing, and the obtained high-strength bolt has the characteristic of high tensile strength, and meets the market demand.

The invention relates to a bimetal MOFs modified titanium implant capable of achieving dual-waveband optical response and a preparation method and application thereof. The method comprises the following steps: (1) pretreating titanium-based metal; (2) immersing the pretreated titanium-based metal substrate into a sodium hydroxide solution to obtain titanium-based metal with a sodium titanate pre-coating; and (3) the titanium-based metal with the sodium titanate pre-coating reacts with a mixed solution composed of a tetrabutyl titanate solution, a copper nitrate hexahydrate solution and a 2-aminoterephthalic acid solution, and the bi-metal MOFs modified titanium implant capable of achieving dual-waveband optical response is obtained. According to the bimetal MOFs modified titanium implant capable of achieving dual-waveband optical response, OH, O2, 1O2, H2O2 and other various active oxygen can be produced according to dual-waveband illumination as required, rapid sterilization in an operation and precise antibacterial after the operation are achieved, the occurrence rate of infectious bone defect feeling is remarkably reduced, and a programmable photocatalytic antibacterial barrier is provided for orthopedic implants.

This invention discloses a method for preparing a catalyst by impregnation and its application in methanol-to-hydrogen production, belonging to the field of hydrogen production technology. The method for preparing the catalyst by impregnation includes the following steps: (1) mixing alumina, zirconium oxide, cerium oxide, pore-forming agent, surfactant, and deionized water, followed by ball milling, molding, drying, and calcination to obtain a composite support; (2) stirring and mixing copper nitrate, zinc nitrate, and deionized water, adjusting the pH to obtain an impregnation solution; (3) impregnating the composite support in the impregnation solution using an equal-volume impregnation method, followed by drying, calcination, and reduction to obtain the catalyst. The catalyst prepared by the method of this invention exhibits high methanol conversion rate and H2 selectivity in the catalytic production of hydrogen from methanol, and also demonstrates excellent stability in use.

This invention relates to the field of fabric technology, specifically to a breathable antibacterial fabric and its preparation process, and sportswear made from this fabric. The preparation process of the breathable antibacterial fabric includes: preparation of a composite antibacterial agent, preparation of multifunctional polyester fibers, amination modification of phenolic lignin, modification treatment of polyacrylonitrile, and preparation of the breathable antibacterial fabric. The breathable antibacterial fabric of this invention consists of inner, middle, and outer layers: the inner layer is a blend of modal and other materials, which is skin-friendly, moisture-wicking, and antibacterial; the middle layer is a polyurethane film layer; the outer layer contains polyacrylonitrile composite fibers, which are antibacterial, crisp, and breathable. A composite antibacterial agent made of chitosan, cysteine, and copper nitrate imparts dual antibacterial properties to the fabric, reducing bacterial resistance. Ethylene treatment enhances the bonding of components, improving wash resistance and antistatic properties; the co-spinning of amination-modified phenolic lignin and polyacrylonitrile increases fiber strength, breathability, and UV resistance. This fabric is suitable for sportswear.

The application belongs to the technical field of electrocatalytic energy, and particularly discloses a bismuth-doped copper-based nanocatalyst and a preparation method and application thereof, wherein the preparation method comprises the following steps: taking copper nitrate trihydrate and bismuth nitrate according to the metal molar ratio of copper to bismuth, and then adding them into a sodium citrate aqueous solution, stirring until completely dissolved to prepare a solution A; taking sodium borohydride and dissolving it in ice deionized water to prepare a solution B; adding the solution B into the solution A, stirring and reacting, and then standing, removing the supernatant, and retaining the precipitate; dispersing the precipitate in deionized water, and then centrifugally separating, repeating the operation for multiple times to wash the residual ions on the surface, and drying the obtained precipitate to obtain the Cu-Bi nanocatalyst. The application adopts a transient co-reduction strategy, has the advantages of simple synthesis process and batch preparation compared with the existing copper-based catalyst synthesis technology, and realizes the construction of the non-equilibrium defect engineering of the bismuth-doped copper-based catalyst at normal temperature.

This invention relates to an aerogel with smoke-generating agent encapsulation function, its preparation method, and its applications. The raw materials for preparing the aerogel with smoke-generating agent encapsulation function include xanthan gum, sodium carboxymethyl cellulose, copper nitrate, and magnesium nitrate. The aerogel of this invention has numerous nano-protrusion structures, which can effectively support smoke-generating agents and other materials in heated cigarettes. Furthermore, the aerogel exhibits excellent adsorption properties for ammonia, a harmful substance in heated cigarette smoke. In addition, the preparation method of the aerogel with smoke-generating agent encapsulation function involved in this invention is simple and easy to operate, making it highly suitable for industrial applications.

The application discloses a method for preparing nano copper-tungsten alloy powder by nitriding and denitrogenation. The method specifically comprises the following steps: taking copper nitrate and ammonium metatungstate as raw materials, mixing the two according to a proportion, and then obtaining a uniform mixed liquid by using a water bath heating mode; drying the mixed liquid in a blast drying oven to obtain a precursor powder; calcining the precursor powder in a muffle furnace to obtain a mixed oxide; and placing the mixed oxide in a tube furnace to obtain nano copper-tungsten powder by nitriding and denitrogenation. The method can obtain a large amount of precursor by using a liquid-liquid mixing and calcining process, and the subsequent nitriding and decomposition process is completed in one step in the tube furnace, and the nano copper-tungsten powder with an oxygen content of not more than 500 ppm can be directly obtained by furnace cooling. The method effectively improves the production efficiency of the nano powder, and enables batch production of the nano powder. The powder preparation process and equipment are simple, and industrial production can be implemented.

This invention provides a copper-based covalent organic framework material, its preparation method, and its application. The method comprises: S1, dissolving copper nitrate trihydrate and 1H-pyrazole-4-formaldehyde in a mixed solvent of N,N-dimethylformamide, ultrapure water, and anhydrous ethanol, stirring until homogeneous, heating, cooling, centrifuging, and washing to obtain trinuclear copper complex crystals; S2, mixing the trinuclear copper complex crystals obtained in step S1 with 2,5-diaminobenzoic acid in a mixed solvent of 1,2-dichlorobenzene, n-butanol, and trifluoroacetic acid, ultrasonicating, followed by thawing and degassing via a refrigeration pump, heating for reaction, filtering, washing, and vacuum drying to obtain Cu3-COOH-COF. This invention successfully and stably introduces carboxyl groups into the COFs framework and, through systematic research, confirms that enhanced hydrophilicity can significantly improve the efficiency of CO2 reduction to formic acid—a structure-activity relationship that fills a theoretical gap in the field of COFs photocatalyst interface microenvironment regulation, providing a universal strategy for the design of subsequent high-performance photocatalysts.

This invention discloses a Cu1 / CeO2 single-atom catalyst and its preparation method, comprising the following steps: dispersing CeO2 in distilled water, adding ascorbic acid, stirring at room temperature, centrifuging, washing, and drying to obtain solid CeO2-R; dispersing CeO2-R in distilled water, adding copper nitrate to adjust the solution to alkaline, stirring, centrifuging, washing, and drying to obtain solid Cu1 / CeO2-W; calcining Cu1 / CeO2-W under a protective atmosphere to obtain the product Cu1 / CeO2-R. This invention utilizes the above-described Cu1 / CeO2 single-atom catalyst and its preparation method, injecting electrons into the surface of the flower-like CeO2 support through the adsorption of the reducing agent ascorbic acid. These electrons can capture Cu due to the attraction between positive and negative charges. 2+ The atom prevents copper ion migration and aggregation. The preparation method is simple. The prepared Cu1 / CeO2-R catalyst exhibits excellent denitration catalytic activity and N2 selectivity, which is far superior to traditional doped catalysts and pure CeO2 catalysts.