1364 results about "Copper oxide" patented technology

The invention belongs to the technical field of energy storage materials, and particularly relates to a high-entropy oxide Fe0. 2Co0. 2Ni0. 2Cu0. 2Zn0. 2O and an ultrafast synthesis method and application thereof. According to the preparation method, ferroferric oxide, cobalt oxide, nickel oxide, copper oxide and zinc oxide with equal molar ratio are adopted as direct synthesis raw materials, toxic gases such as chlorine and nitrogen dioxide generated in the synthesis process of a metal salt precursor are avoided, and the uniformly distributed single-phase high-entropy oxide is synthesized in an ultrafast manner within 10 seconds by using a Joule heating technology; the synthesized high-entropy oxide is used as a lithium ion battery negative electrode material, and shows more excellent electrochemical performance and cycling stability compared with other high-entropy oxides prepared from transition metals with different proportions; in the preparation process, extra additives are not needed, operation is easy, the synthesis speed is high, the yield is high, element distribution is uniform, and the method has the advantages of being low in cost, high in efficiency and free of pollution and has the industrialization prospect.

The invention provides antioxidant copper powder for low-temperature slurry, low-temperature sintered copper slurry and a preparation method of the low-temperature sintered copper slurry, and belongs to the technical field of slurry for heterojunction batteries. The antioxidant copper powder comprises copper powder and a coating agent coating the surface of the copper powder; wherein the coating agent comprises acrylic acid, oleic acid and paraformaldehyde. The anti-oxidation copper powder is formed by coating the surface of the copper powder with the coating agent formed by the acrylic acid, the oleic acid and the paraformaldehyde, and the low-temperature sintering copper paste formed by matching the anti-oxidation copper powder with other components can realize low-temperature sintering in air, does not need a protective atmosphere and has good conductivity.

The invention relates to a modified current collector for a cathode-free metal battery and a preparation method and application thereof.The preparation method comprises the steps that an in-situ modification reaction is conducted on the surface of a copper current collector to obtain a current collector coated with a copper oxide nanometer material, and then selenium is introduced to the surface of the current collector coated with the copper oxide nanometer material through a partial in-situ substitution reaction to obtain the modified current collector coated with the copper oxide nanometer material. The preparation method comprises the following steps: preparing a copper selenide and copper oxide composite modified current collector, performing in-situ lithiation reaction through electrochemical deposition, and partially converting to generate corresponding lithiates, thereby obtaining the modified current collector for the non-anode metal battery. According to the invention, the functional artificial interface layer with lithium affinity, high stability and high ionic conductivity is constructed on the surface of the copper-based current collector in situ, so that the key problems of uneven metal deposition and unstable SEI layer on the surface of the negative electrode current collector in the current research of the metal secondary battery without the negative electrode are solved, the formation of dendritic crystals and the occurrence of side reactions are inhibited, and the service life of the metal secondary battery is prolonged. Therefore, the coulombic efficiency, the safety and the cycle life of the battery are improved.

The invention discloses an efficient combined regulator for easily-argillized copper oxide cobalt ore and a beneficiation method. The efficient combined regulator comprises the following components in parts by weight: 250-350 parts of sodium citrate and 1100-1200 parts of sodium hydrosulfide. Sodium citrate has high dispersing capacity, and the efficiency of selective adsorption between the argillization copper-cobalt ore and the medicament can be improved; meanwhile, the complexing ability of sodium citrate on ions, such as Fe, Ca and Mg, influencing agent adsorption on the surface of the ore is high, in addition, products obtained after complexing of the Fe, Ca and Mg ions can be dissolved in water, and action sites are provided for selective adsorption of a vulcanizing agent (NaHS) and a collecting agent amyl xanthate (PAX). According to the combined regulator and the beneficiation method provided by the invention, the problem of poor reagent selectivity in the flotation process of the argillization copper-cobalt ore can be obviously improved, the vulcanization effect of a vulcanizing agent is enhanced, and selective adsorption of a collecting agent is promoted, so that the recovery rate of copper and cobalt metals in the copper-cobalt oxide ore under the condition of serious ore argillization is improved.

The invention relates to the technical field of ceramic substrates, and provides a low-dielectric-constant multilayer ceramic substrate and a preparation method thereof. The low-dielectric-constant multilayer ceramic substrate comprises the following components in parts by weight: 100 parts of aluminum oxide, 4-8 parts of a sintering aid, 8-16 parts of silicate, 3-6 parts of copper oxide, 3-5 parts of a dispersing agent, 6-12 parts of a binder and 70 parts of a solvent, the silicate comprises magnesium aluminum silicate and zirconium silicate in a weight ratio of (1.5-9): 1. According to the technical scheme, the problem that the bending strength of the multi-layer ceramic substrate is poor in the prior art is solved.

A method of adsorption includes contacting a nanocomposite with a solution including one or more pollutants. The nanocomposite is a graphite-phase carbon nitride copper oxide and magnesium aluminum oxide (g-C3N4@CuO / MgAl2O4) material and includes a graphite-phase carbon nitride (g-C3N4) in an amount of 5 to 15 percent by weight (wt. %), copper oxide in an amount of 3 to 7 wt. %, and magnesium aluminum oxide (MgAl2O4) in an amount of 80 to 90 wt. % based on a total weight of the g-C3N4@CuO / MgAl2O4 material. The method further includes adsorbing the one or more pollutants on the nanocomposite.

The invention relates to the technical field of ceramic substrates, and provides an aluminum oxide high-temperature co-fired multilayer ceramic substrate and a preparation method thereof. The aluminum oxide high-temperature co-fired multilayer ceramic substrate comprises the following raw materials in parts by weight: 80-90 parts of aluminum oxide, 3-6 parts of a reinforcing agent, 2-5 parts of a sintering aid, 85-95 parts of a solvent, 6-12 parts of a binder and 0.5-1.5 parts of a dispersing agent, the reinforcing agent comprises yttrium oxide coated silicon carbide and copper oxide. According to the technical scheme, the problem that the strength of the aluminum oxide high-temperature co-fired multilayer ceramic substrate is insufficient due to long-time high-temperature sintering of a low-viscosity liquid phase in related technologies is solved.

The invention relates to the technical field of metallurgy, in particular to an efficient-utilization copper-cobalt ore dump leaching treatment method which comprises the steps that after copper-cobalt sulfide ore and copper-cobalt oxide ore are subjected to crushing treatment respectively, heap building is conducted; a solution of acidithiobacillus ferrooxidans is added into a sulfuric acid solution to serve as spraying liquid, heap leaching treatment is conducted on the heap-built copper-cobalt ore through a spraying device, and the spraying flow of the spraying device is controlled in the heap leaching treatment process according to changes of the environment temperature and humidity and changes of the pH value of heap leaching liquid; the obtained dump leaching liquid is subjected to extraction-electrodeposition treatment, and cathode metal copper, sediment and raffinate are obtained; and the raffinate serves as spraying liquid to be subjected to spraying circulation, precipitation is neutralized, and metal cobalt is recycled. The spraying flow of the spraying device is accurately controlled and adjusted, and the leaching effect of copper and cobalt metal in the copper-cobalt ore is improved.

The invention relates to a stainless steel flux-cored wire and a preparation method thereof, and relates to the technical field of flux-cored wires. The stainless steel flux-cored wire comprises a stainless steel strip and a double-layer flux core, the stainless steel strip is filled with the double-layer flux core, and the filling amount of the double-layer flux core accounts for 20-25% of the total mass of the stainless steel flux-cored wire; the double-layer flux core comprises a rapid reaction layer and an alloy transition layer, the rapid reaction layer comprises an oil stain oxidizing agent, the oil stain oxidizing agent comprises a high-temperature decomposition type organic matter and an inorganic composition, and the inorganic composition comprises copper oxide and ferric oxide with the mass ratio being (1-1.5): 1. The high-temperature decomposition type organic matter comprises polytetrafluoroethylene micro powder and trisodium citrate according to the mass ratio of 1: (3-5), and the alloy transition layer comprises 316L stainless steel powder, metal powder, silicon powder, niobium carbide and rare earth oxide. The invention can effectively avoid hydrogen embrittlement caused by diffusible hydrogen easily formed by compounds in anti-rust oil remaining on the surface of the welding wire during welding and entering a welding seam.

The present invention discloses a pretreatment method and application of an alumina-supported copper oxide-rare earth metal oxide catalyst. The pretreatment method is as follows: adding the alumina-supported copper oxide-rare earth metal oxide catalyst used for the reaction of ethanol to higher alcohols into a mixture of one or several C1-C8 alcohols, impregnating at 10-90 °C for 1-24 h, filtering to remove the excess alcohol after impregnation is completed, and then drying in an oven at 40-200 °C for 1-24 h to complete the pretreatment of the catalyst. The present invention provides the application of the alumina-supported copper oxide-rare earth metal oxide catalyst pretreated by the pretreatment method in the reaction of ethanol to higher alcohols. The pretreatment method of the present invention significantly increases the selectivity of the product higher alcohols and keeps the conversion rate of ethanol unchanged or slightly improved, thus solving the problem that it is difficult to balance both the conversion rate and selectivity in the prior art.

The invention discloses a method for asynchronously recovering copper and cobalt in sulfur-oxygen mixed copper-cobalt ore tailings through dressing and smelting combination. The sulfur-oxygen mixed copper-cobalt ore tailings are divided into a coarse fraction, a medium fraction and a fine fraction according to particle sizes; the coarse fraction is subjected to ore grinding and copper sulfide flotation, part of copper and cobalt are recycled, and coarse fraction tailings are obtained; the medium fraction is subjected to copper sulfide flotation, copper oxide flotation and magnetic separation, part of copper and cobalt are recycled, and medium fraction tailings are obtained; the fine fraction is subjected to magnetic separation, part of copper and cobalt are recycled, and fine fraction tailings are obtained; and neutralizing one or more than two of the coarse-fraction tailings, the medium-fraction tailings and the fine-fraction tailings to recover part of copper and cobalt. According to the characteristics of the sulfur-oxygen mixed copper-cobalt ore tailings, the sulfur-oxygen mixed copper-cobalt ore tailings are divided into different size fractions, and different grading processes are adopted for treatment. And efficient enrichment and recovery of copper minerals and cobalt minerals with different properties in the sulfur-oxygen mixed copper-cobalt ore tailings are realized through a multi-process combined grading process.

The invention discloses a copper-silicon catalyst as well as a preparation method and application thereof, and the copper-silicon catalyst comprises the following components in percentage by weight: 43-79wt% of silicon dioxide; the content of copper oxide is 15-35 wt%; the content of the auxiliary agent A is 3-10 wt%; the auxiliary agent B accounts for 3-12 wt%; the auxiliary agent A comprises one or more of alkali metal or alkaline earth metal oxides; and the auxiliary agent B comprises one or more of VB to VIIB group metal oxides. The raw materials of the catalyst are cheap and easy to obtain, the reaction condition is mild, the catalyst is environment-friendly, and the prepared catalyst is small in copper species particle size, high in dispersity, high in conversion rate and selectivity and good in stability.

The invention provides a wastewater advanced oxidation catalyst and a preparation method and application thereof, the wastewater advanced oxidation catalyst is of a core-shell structure, the core is activated carbon containing copper oxide and optional ferrous sulfide, and the shell is a silicon oxide-aluminum oxide compound containing nano ferrous sulfide. The invention further provides a preparation method of the wastewater advanced oxidation catalyst and application of the wastewater advanced oxidation catalyst in organic wastewater treatment. The wastewater advanced oxidation catalyst has the characteristics of high catalytic degradation capability on organic pollutants and the like, solves the problem of copper dissolution, and improves the long-term effectiveness of the catalyst.

The invention discloses a biological carbon / graphene composite material as well as a preparation method and application thereof. The method comprises the following steps: impregnating a biomass raw material with a copper salt solution to obtain a precursor; the precursor is pyrolyzed to obtain a copper oxide modified biological carbon material, then under the conditions of reducing atmosphere and high temperature, carbon dioxide serves as a carbon source, graphene is generated on the copper oxide modified biological carbon material in situ, the biological carbon / graphene / copper composite material is obtained, and the biological carbon / graphene / copper composite material is subjected to copper leaching treatment to obtain the graphene / copper composite material. Obtaining a finished product. The composite material has excellent electrochemical performance, and has excellent rate capability, capacitance and long cycle service life when being used for preparing a capacitor. The preparation method is simple, low in cost and suitable for industrial production.

The invention provides a Joule heat ultrafast sintering preparation method of barium titanate ceramic with ultrahigh dielectric constant and low loss, which comprises the following steps: ball-milling and mixing barium titanate powder and copper oxide powder, drying, pressing into a cake-shaped sample, carrying out cold isostatic pressing to obtain a sample piece, and carrying out vacuum treatment on Joule heat ultrafast sintering equipment to obtain the barium titanate ceramic with ultrahigh dielectric constant and low loss. Putting the sample preparation sheet between two layers of graphite felts, and starting Joule heat ultrafast sintering equipment to enable the graphite felts to generate Joule heat, so as to realize short-time sintering of the barium titanate ceramic. According to the invention, a Joule heat ultrafast sintering technology is adopted, and Joule heat is generated by directly applying voltage and current to the graphite felt, so that the sintering time is greatly shortened, and environmental pollution is avoided; meanwhile, the dielectric constant of the barium titanate ceramic is greatly improved by adding copper oxide, and the energy consumption is remarkably reduced.

The invention relates to composition and preparation of a thick-film copper conductor sintered at different temperatures and different atmospheres, and belongs to the field of chemical preparation. Comprising the following steps: mixing 65-85% of copper powder, 3.0%-15.0% of glass, 15.0%-35.0% of an organic adhesive and 0.1-1.5% of an additive which is one or more of titanium trioxide or stannous oxide, cuprous oxide and copper oxide, rolling into slurry, and sintering at 850-950 DEG C under the protection of nitrogen or ammonia gas to obtain a copper conductor. The medium-temperature copper paste is prepared by the following steps: mixing 60.0-85.0% of copper powder, 3.0-13.0% of glass, 8.0-25.0% of an organic adhesive and 0.2-1.6% of an additive which is one or more of titanium sesquioxide or stannous oxide, cuprous oxide and copper oxide, rolling into paste, and sintering at 450-650 DEG C under the protection of nitrogen or ammonia gas to obtain a copper conductor. The low-temperature copper paste is prepared by mixing 60.0-85.0% of copper powder, 3.0-13.0% of glass, 8.0-25.0% of an organic binder and 0.1-2.0% of an additive which can be one or more of elemental elements of magnesium, zinc, boron and phosphorus or one or more of nickel phosphide, nickel boride, copper phosphide and copper oxide, rolling the mixture into paste, and sintering the paste in air at 250-350 DEG C to obtain a copper conductor.

The invention discloses a praseodymium-copper heterogeneous catalyst for synthesizing a multi-carbon alcohol product through efficient electroreduction of carbon dioxide and a preparation method of the praseodymium-copper heterogeneous catalyst. The praseodymium-copper heterogeneous catalyst is a composite material of praseodymium oxide and copper oxide, and praseodymium, copper and oxygen are uniformly distributed in the praseodymium-copper heterogeneous catalyst; the praseodymium oxide is an oxide with the praseodymium-oxygen molar ratio of 6: 11; the molar ratio of praseodymium to copper is not less than 2. The invention provides a method for preparing a multi-carbon alcohol product by electrocatalytic reduction of carbon dioxide, which comprises the following steps: by taking a mercury / mercuric oxide electrode as a reference electrode, a foamed nickel electrode as a counter electrode and a praseodymium-copper heterogeneous catalyst as a working electrode, carrying out electrochemical reduction in a gas diffusion type flowing electrolytic tank to obtain the multi-carbon alcohol product. The praseodymium-copper heterogeneous catalytic material is designed, and the interaction relationship between metal and a carrier and between the metal and the carrier and a reaction intermediate in the catalyst is adjusted by introducing the rare earth element praseodymium, so that the reaction activity and the target product selectivity are improved.

The invention provides a water treatment method and device using an alkali-reinforced copper-based material to excite peroxymonosulfate, and relates to the technical field of wastewater treatment.The method comprises the steps that an alkali agent, the copper-based material and peroxymonosulfate are added into water to be treated; the alkaline agent is sodium hydroxide and / or potassium hydroxide; the copper-based material is copper oxide and / or copper sulfide. The method provided by the invention has the advantages of excellent pollutant treatment effect, mild reaction conditions, simple process flow, environmental protection, energy saving, easy recovery and recycling and the like, and realizes the purposes of small dosage of the oxidant and the catalyst, high utilization rate of the oxidant, small dissolution amount of metal ions and up-to-standard pH of effluent.

The invention provides a graphene-based capacitive sensor for detecting the moisture content in lubricating oil, a preparation method of the graphene-based capacitive sensor and a method for detecting the moisture content in the lubricating oil, and belongs to the technical field of moisture content detection. The graphene-based capacitive sensor for detecting the moisture content in the lubricating oil comprises a graphene-based electrode and a gold nanoparticle layer which are arranged in a laminated manner, the graphene-based electrode comprises a laser-induced graphene film and doped nanoparticles loaded on the surface and in pores of the laser-induced graphene film, and the doped nanoparticles are silver nanoparticles and copper oxide particle clusters; array holes are formed in the gold nanoparticle layer, the diameter of holes in the array holes is larger than the diameter of water molecules and smaller than the diameter of lubricating oil molecules, and the depth of the holes in the array holes is consistent with the thickness of the gold nanoparticle layer. The graphene-based capacitive sensor can realize real-time online detection of the moisture content in the lubricating oil, and is high in detection sensitivity and simple to operate.

The invention discloses a self-cleaning composite piezoelectric ceramic membrane as well as a preparation method and application thereof, and belongs to the field of composite ceramic membranes. The technical problem that an existing ceramic membrane separation technology is poor in biomembrane pollution resisting effect is solved. According to the preparation method, the barium titanate ceramic membrane is firstly prepared to serve as the base membrane, then the copper oxide one-dimensional nanostructure is loaded on the piezoelectric ceramic substrate, and the base membrane has a large membrane surface area and can be combined with more catalysts, so that more active sites are provided for catalytic reaction; according to the composite membrane, the hydrophilicity, the anti-pollution performance and the piezoelectric catalysis self-cleaning performance of the membrane are remarkably improved, and pollutants in water can be quickly and effectively separated, so that the flux and the anti-pollution performance of the membrane are improved.

In one aspect, the disclosure relates to a composition and a catalyst for substantially continuous CO2 capture and reduction from dilute CO2 sources including flue gas, wherein the flux of CO2 captured is substantially equal to the flux of CO2 reduction. The system can comprise integrated CO2 capture and reduction components. An exemplary system includes a composition of a catalyst and electrolytes. The catalyst can comprise supported or unsupported mesh electrodes that comprise Cu, a Cu—Al alloy, and / or a copper oxide. In one aspect, the system includes one or more membranes separating an anodic side from a cathodic side in the system, where the one or more membranes can be a bipolar membrane, an anion exchange membrane, or both, which can reduce or eliminate Cl2 production. In exemplary embodiments, the value-added products can be selected from CO, CH4, C2H4, C2H5OH, CH3COOH, CH3OH, C3H6, and / or H2.

The invention provides an industrial electrode for synthesizing urea through electro-catalysis C-N coupling and a preparation method and application of the industrial electrode, and belongs to the field of urea synthesizing.The industrial electrode for synthesizing urea through electro-catalysis C-N coupling comprises a conductive substrate and an electro-catalysis material coating the surface of the conductive substrate; the electrocatalytic material comprises a magnesium oxide modified copper oxide catalyst, and MgO nanoparticles and CuO nanoparticles in the magnesium oxide modified copper oxide catalyst are in contact with each other to form a heterostructure. The magnesium oxide modified copper oxide catalyst is used as an electro-catalysis material, MgO nano-particles and CuO nano-particles in the catalyst material are in contact with each other to form a heterostructure, after MgO is introduced, the CO2 adsorption and activation capacity is improved, CO and NHx coupling is promoted, and the urea Faraday efficiency is improved. The industrial electrode shows excellent selectivity and stability in the process of electro-catalytic synthesis of urea.

The invention relates to the technical field of ceramics, in particular to mottle crack glazed ceramic and a preparation method thereof.The ceramic comprises a green body, ground glaze and cover glaze, and the ground glaze is prepared from, by weight, 30-35 parts of kaolin, 25-30 parts of quartz, 20-25 parts of feldspar, 8-12 parts of ferric oxide, 5-8 parts of calcium carbonate and 3-5 parts of borax; the cover glaze is prepared from the following raw materials in parts by weight: 35 to 40 parts of feldspar, 25 to 30 parts of quartz, 6 to 10 parts of copper oxide, 5 to 8 parts of granular rock powder, 8 to 12 parts of borax and 5 to 8 parts of clay. Embedding porous particles into the green body to initiate explosion cracks, and fusing interlayer stress cracks and devitrification cracks to form a multi-stage composite crack network; iron ions in the ground glaze and copper ions in the cover glaze form ion gradient migration through the iron axe stone powder in the middle layer to generate red and green blended stripes; the microcapsule carbon powder regulates and controls the pores and texture of the glaze, and copper foil fragments are oxidized and reduced to form gilding-brown mottles.

The invention relates to the technical field of electro-catalysis materials, and discloses an iron-doped copper oxide catalyst, a preparation method thereof and application of the iron-doped copper oxide catalyst in electro-catalysis of nitrate to synthesize ammonia. The method comprises the steps that CuCl2 serves as a metal precursor, ascorbic acid serves as a reducing agent, and Cu2O nanoparticles are obtained through a hydrothermal precipitation method; then, Cu2O is added into a solution containing FeSO4, sodium borohydride is added, centrifugal washing and drying are carried out, and the iron-doped copper oxide nitrate electroreduction catalyst which is rich in defects and uniform in metal dispersion is obtained through a programmed heating pyrolysis reduction method. The electro-catalytic material obtained by adopting the method disclosed by the invention has a relatively large catalytic active area and relatively abundant defect sites and oxygen vacancies, the nitrate adsorption and activation effects are improved, the supply of active hydrogen is promoted by constructing stable heterogeneous active sites, the product selectivity and Faraday efficiency in NO3RR are improved, and the electro-catalytic material has good durability.

The invention relates to the technical field of photocatalysis, and provides a preparation method of a copper-cuprous oxide-copper bismuthate ternary complex, which comprises the following steps: adding sodium bismuthate dihydrate, copper sulfate and sodium sulfite into a hydrothermal reaction kettle containing distilled water to obtain a solid-liquid mixture; and the solid-liquid mixture generates the copper-cuprous oxide-copper bismuthate ternary compound under a hydrothermal condition through a synergistic effect of a heterogeneous interface in-situ oxidation-reduction reaction of sodium bismuthate and a sodium sulfite solution and a homogeneous oxidation-reduction reaction of a copper sulfate solution and the sodium sulfite solution. The preparation method has the advantages that the elemental copper-cuprous oxide-copper bismuthate ternary compound is prepared by a one-pot method through cooperation of the out-phase interface in-situ oxidation-reduction reaction and the homogeneous oxidation-reduction reaction, and the preparation method is simple in preparation step, convenient to operate and easy to quantitatively control.

The invention discloses porous chlorine dioxide slow-release preservative paper and a preparation method thereof.The porous chlorine dioxide slow-release preservative paper comprises a paper base, a porous carrier is fixed to the paper base through oxidized starch glue, and sodium chlorite, an activating agent and a stabilizing agent are loaded on the porous carrier; the porous carrier is one of aluminum oxide, titanium oxide, cobalt oxide, zinc oxide, copper oxide, iron oxide, cerium oxide, zirconium oxide, nickel oxide, manganese oxide, praseodymium oxide and lanthanum oxide with a porous structure. The slow release of chlorine dioxide can be stably and effectively realized, the release period of chlorine dioxide is prolonged, and long-acting stable sterilization and disinfection effects are realized.

The invention relates to the technical field of nuclear reactors, and discloses a high-temperature gas cooled reactor helium purification monitoring system and a start-stop and helium purification regeneration judgment method. The high-temperature gas cooled reactor helium purification monitoring system comprises a humidity monitoring module arranged in a high-temperature gas cooled reactor; the first monitoring module is arranged between the dust filter and the copper oxide bed and consists of a first moisture concentration monitoring unit, a first gas tritium concentration monitoring unit and a first liquid tritium concentration monitoring unit; the second monitoring module is arranged between the copper oxide bed and the molecular sieve bed and consists of a second moisture concentration monitoring unit, a second gas tritium concentration monitoring unit and a second liquid tritium concentration monitoring unit; and the third monitoring module is arranged between the molecular sieve bed and the low-temperature adsorber and consists of a third moisture concentration monitoring unit, a third gas tritium concentration monitoring unit and a third liquid tritium concentration monitoring unit. By monitoring the humidity of the high-temperature gas cooled reactor and parameters of all links of the helium purification system, a basis is provided for determining the helium purification regeneration period, and impurities are prevented from exceeding the standard or being excessively regenerated.

The invention belongs to the technical field of nano material preparation, and provides a preparation method and application of a rare earth ytterbium-doped copper oxide nano material. The method comprises the following steps: dissolving rare earth ytterbium salt, copper salt and a surfactant in a solvent, and uniformly stirring; dissolving an organic ligand in a solvent; stirring and mixing the two solutions, transferring into a reaction kettle, and carrying out hydrothermal reaction; and centrifugally washing the obtained product with ethanol, and drying to obtain the rare earth ytterbium doped metal organic precursor nano material. And placing the obtained nano material in a muffle furnace for high-temperature calcination to obtain the rare earth ytterbium doped copper oxide material. The preparation method provided by the invention is simple, green, pollution-free and high in practical degree, and the obtained rare earth ytterbium-doped copper oxide nano material can be used as a catalyst for synthesizing ammonia by electrolytic nitrate reduction, and shows that the rare earth ytterbium-doped copper oxide nano material has relatively high ammonia yield and Faraday efficiency for synthesizing ammonia by nitrate reduction.

The present invention discloses a strong, non-toxic, antibacterial and antiviral nano-functional material and a preparation method thereof. The nano-functional material is green, non-toxic and harmless, and its antibacterial and antiviral effect can reach more than 99%. The new nano-material innovatively uses the natural antibacterial agent meta-dichlorostyrene meta-dichloroacetophenone as the main body of the material to exert its antibacterial and antiviral effects. This makes the new nano-material not only have extremely strong antibacterial and antiviral effects, but also as a natural antibacterial agent, when it is used as a textile material, it can be non-toxic and harmless to the human body, green and healthy. It has a better inhibitory effect on both Gram-negative and Gram-positive bacteria than nano-copper oxide and meta-dichlorophenylethanol and meta-dichloroacetophenone. The present invention also provides a preparation method for the nano-functional material, which includes chemical reaction processes such as boron hydrolysis reaction, catalytic oxidation reaction, electrocarboxylation reaction, and esterification reaction.

The invention discloses an ignition powder composition capable of preventing mistaken combustion and a preparation method and application thereof.The ignition powder composition capable of preventing mistaken combustion is prepared from, by weight, 30-75 parts of metal fuel particles, 8-35 parts of copper oxide, 5-25 parts of ammonium phosphate and 3-18 parts of coating agent.The application of the ignition powder composition capable of preventing mistaken combustion comprises the following steps that 1, the ignition powder composition capable of preventing mistaken combustion is prepared from, by weight, 30-75 parts of metal fuel particles, 8-35 parts of copper oxide, 5-25 parts of ammonium phosphate and 3-18 parts of coating agent; and at least one of an electric igniter or a chemical activating agent needs to be matched for use. The coated magnesium powder is used as metal fuel particles, and components such as copper oxide and ammonium phosphate are matched with the coated magnesium powder to jointly perform oxidation-reduction reaction; the pyrophoric powder composition can be ignited only by being matched with an electric igniter or a chemical activating agent, mistaken combustion caused by external factors or improper manual operation is avoided, and the pyrophoric powder composition is particularly suitable for occasions with high safety requirements such as industrial high-temperature welding ignition devices, petroleum drilling engineering or firework delayed ignition devices.