101 results about "Copper hydroxide" patented technology

The invention belongs to the technical field of metal powder preparation, and particularly relates to a preparation method of copper powder. According to the method, the pH value of a reduction reaction system is precisely regulated and controlled to be within the range of 5.38-9.38, the dispersing agent is reasonably added in stages before and after pH regulation, and the copper powder with the small average particle size and the low variable coefficient is successfully prepared. From the perspective of the process principle, the accurate regulation and control of the pH value can influence the crystal growth kinetics of copper hydroxide by adjusting the proton concentration, and directionally induce the copper hydroxide to form a target crystal form with a regular structure and uniform morphology, thereby laying a foundation for uniform nucleation and growth of copper atoms in the subsequent reduction reaction; by adding the dispersing agent in stages, the steric hindrance effect and the interface adsorption effect of the dispersing agent can be synergistically exerted, copper hydroxide particles are effectively inhibited from being agglomerated in the early stage, copper particles are prevented from being agglomerated due to too high local concentration in the reduction process in the later stage, and the consistency of the particle size is further guaranteed.

The present invention belongs to the technical field of petrochemical catalysis, and relates to a preparation method for improving the stability of a Cu-Beta zeolite catalyst for preparing caprolactam from caprolactone, and the use thereof. In the present invention, a cavity-modified dealuminated Beta zeolite is used as a carrier, and copper is loaded in pore channels of the zeolite carrier by means of an improved ammonia distillation method. The cavity modification refers to subjecting the dealuminated Beta zeolite carrier to a desiliconization technique controlled by the use of a weak organic base so as to enlarge silanol nests generated by dealumination of the dealuminated Beta zeolite carrier, thereby better accommodating and stabilizing the nano and sub-nano copper particles. The core of the improved ammonia distillation method involves impregnating a zeolite carrier with an equal volume of a copper-ammonia complex solution, such that the copper-ammonia complex mainly undergoes, during ammonia distillation, a reaction of depositing copper hydroxide in zeolite pore channels, thereby improving the sintering resistance. The Cu-Beta catalyst prepared using the method provided by the present invention exhibits high activity, selectivity and stability when applied to the reaction of caprolactam prepared from caprolactone via gas-solid phase hydroamination.

The application discloses a preparation method of mesoporous copper oxide and application thereof. The preparation method comprises the following steps: S1, preparing a hydroxyl copper nitrate microplate by taking calcium carbonate paper as a substrate and copper nitrate as a solvent; S2, synthesizing an ordered copper hydroxide nanowire assembly through an alkali solution reaction; and S3, performing annealing treatment in a muffle furnace to obtain the mesoporous copper oxide microplate. Under the conditions of no hard template, no soft template and no strong acid treatment, the application provides a method for synthesizing the mesoporous copper oxide microplate material with uniform pore structure on the carbonic paper by adopting copper nitrate hydrolysis, alkali etching and annealing, and the synthesis method of the mesoporous structure has the advantages of simple operation, good controllability and low cost. The application also relates to application of the mesoporous copper oxide as an electrocatalyst material in the field of glucose electrochemical sensing.

The invention provides a separation and extraction method for valuable metals in electroplating sludge, and belongs to the technical field of solid waste recycling. The electroplating sludge is copper-containing electroplating sludge, and the method comprises the following steps: mixing dehydrated and dried electroplating sludge with an organic acid solid auxiliary agent, carrying out gradient weak reduction pretreatment, cooling, and carrying out magnetic separation to remove iron; adding ammonia water to react, separating solid waste and collecting an ammonia-containing complex solution; adjusting the pH value to 9-10, carrying out distillation deamination at 60-70 DEG C, carrying out gas-solid waste separation, precipitating to obtain a copper hydroxide crude product, and dissolving the nickel element in the residual liquid; adjusting the pH value of the residual liquid to 10-11, carrying out two-stage distillation deamination, and precipitating to obtain a nickel hydroxide crude product; and purifying the copper hydroxide crude product and the nickel hydroxide crude product to obtain a copper hydroxide refined product and a nickel hydroxide refined product. According to the method, the dried electroplating sludge is mixed with the solid organic acid, reduction pretreatment is carried out under the conditions of different atmospheres and different temperatures, the ammonia complexing and graded deamination processes are combined, efficient recovery of copper and nickel is achieved, and the purity of the recovered metal is high.

The invention relates to a method for recovering valuable components from high-copper and high-iron complex gold extraction broken carbon roasting slag. The method comprises the following steps: grinding and grading: grinding and grading a material to be treated into a fine material with the particle size of-0.074 mm accounting for 70%-80%; flotation decarburization is conducted, specifically, primary roughing is conducted on the fine material slurry, carbon-containing concentrate and tailings are obtained, and the carbon-containing concentrate is returned to an original roasting ashing system to be roasted again to obtain concentrate roasting slag; selective leaching of copper: feeding the tailings and the concentrate roasting slag into an ammonia-chlorine solution for pre-leaching to obtain copper-containing leaching liquid and leaching slag; first-stage preferential leaching is conducted, specifically, the leaching residues are fed into a cyaniding system to be subjected to first-stage preferential leaching, and a gold and silver pregnant solution and first-stage leaching residues are obtained; second-stage intensified leaching is conducted, specifically, the first-stage leaching residues are subjected to second-stage intensified leaching, and gold and silver pregnant solution and second-stage leaching residues are obtained; and recovery of element copper: conveying the copper-containing immersion liquid to a copper recovery system for distillation to obtain ammonia water and a copper hydroxide precipitate. According to the method, efficient comprehensive recovery of gold, silver and copper in the high-copper-iron complex gold extraction broken carbon roasting slag is achieved.

The invention discloses a method for improving the selectivity of electrocatalytically reducing acetylene into 1, 3-butadiene by using a copper hydroxide hydrophobic nano array, which comprises the following steps: soaking a copper mesh in a mixed solution of NaOH and (NH4) 2S2O8 to obtain a Cu (OH) 2 self-supporting nano array, and then soaking in an ethanol solution of 1-dodecyl mercaptan to obtain a Cu (OH) 2 hydrophobic self-supporting nano array modified by 1-dodecyl mercaptan. A hot press is adopted to tightly press the dried hydrophobic self-supporting nano array and carbon paper to form a working electrode, a cathode chamber and an anode chamber are separated through an anion exchange membrane, electrolyte is composed of a KOH solution, and a peristaltic pump is used to enable a liquid phase to continuously circulate. According to the method, acetylene is subjected to electrocatalytic reduction to obtain 1, 3-butadiene by adopting a three-electrode system, and high-selectivity conversion of acetylene into 1, 3-butadiene is realized.

The invention discloses a layered nano-porous copper loaded cuprous oxide / copper oxide nanowire composite material as well as a preparation method and application thereof. The material is a thin strip and comprises an amorphous substrate thin strip, multiple layers of nano-porous copper covering an amorphous substrate and a cuprous oxide / copper oxide two-component heterojunction nanowire loaded on the surface of the nano-porous copper. The preparation method comprises the following steps: firstly, freely dealloying an amorphous ribbon, and adding PVP (Polyvinyl Pyrrolidone) into dealloying corrosive liquid to generate layered nano-porous copper; then, copper hydroxide nanowires grow on the surface of each layer of nano-porous copper in situ through the anodic oxidation technology; and finally, converting the copper hydroxide into cuprous oxide / copper oxide nanowires with different component proportions by regulating and controlling the temperature by adopting a heat treatment process. The prepared composite material has a larger specific surface area and more active sites, and has unique structure and performance advantages in the field of photocatalytic degradation of organic dyes.

The application discloses a preparation method and purification process of copper hydroxide, a certain amount of anhydrous copper sulfate is accurately weighed, and a certain volume of deionized water is added to prepare a solution with a certain concentration, a copper ammonia solution is prepared: slurry is prepared from circuit board sludge, screening is performed, ammonium bicarbonate or ammonium carbonate is added for reaction, and a copper ammonia solution containing carbonate or bicarbonate is obtained through purification; in addition, high-purity copper powder is added into concentrated ammonia water, concentrated hydrogen peroxide solution is slowly dropped into the concentrated ammonia water, and the dropping is continued until no large amount of bubbles is generated in the solution, and the solution is filtered to obtain a clear indigo blue solution. The production process adds the step of adding a stabilizer and stirring, guarantees the stable state of the copper hydroxide crystal, and enables the copper hydroxide crystal to remain unchanged into copper oxide for one year in an environment with a temperature as high as 60 degrees.

The application provides an amino acid composite reagent system and a method for treating electronic waste to prepare high-purity glycine copper, and belongs to the technical field of metal hydrometallurgy and resource recycling. The application builds an ammonia catalytic reduction mechanism by designing an amino acid composite reagent system, greatly improves the leaching rate, simultaneously inhibits the dual effects of copper hydroxide precipitation and glycine chelation, and realizes efficient solution of copper ions; through narrow window regulation technology of pH at 9.5±0.2, the stability of ammonia, the activity of glycine anion are maintained, and the selective leaching rate of copper is ensured; a directional crystallization process of leaching solution is constructed, the "self-assembly directional crystallization" process of glycine copper chelate is used, based on the saturation concentration of glycine copper in the leaching solution and the stable chelate structure, through three-stage crystallization precise regulation, the preparation of high-purity crystal is realized. The process realizes the closed-loop crystallization system of "zero addition of crystal seeds and zero wastewater discharge" of the copper-containing complex leaching solution of electronic waste.

The present invention relates to the technical field of electrochemical energy materials, and specifically discloses a molybdenum nitride / nickel cobalt nitride nanosheet heterostructure electrocatalytic material, its preparation method and application. The method comprises S1, preparing copper hydroxide nanowires loaded on copper foam; S2, preparing copper nanowires loaded on copper foam; S3, preparing copper nanowire-loaded molybdenum-doped nickel cobalt nanosheets; S4, placing the copper nanowire-loaded molybdenum-doped nickel cobalt nanosheets in a tube furnace, and nitriding them in an ammonia nitrogen atmosphere to obtain a molybdenum nitride / nickel cobalt nitride nanosheet heterostructure electrocatalytic material. The internal resistance of the material is reduced by electron transfer and heterostructure between molybdenum nitride and nickel cobalt nitride, and compared with precious metal platinum wire, the material has excellent high current density hydrogen evolution performance. The preparation method provided by the present invention has the advantages of simple synthesis process, short synthesis cycle and low production cost. In addition, no hydrothermal reaction is required during preparation, the material has high safety and reliable repeatability, and is very suitable for large-scale industrial production.

The application discloses a copper-bismuth bimetallic catalyst and a preparation method and application thereof. The copper-bismuth bimetallic catalyst comprises a copper substrate and copper-bismuth nanowires grown on the copper substrate, the copper-bismuth nanowires comprise copper nanowires and a metal bismuth layer loaded on the copper nanowires, and the mass fraction of bismuth in the copper-bismuth nanowires is 40% to 60%. The preparation method of the catalyst comprises the following steps: after in-situ growth of copper hydroxide nanowires on the copper substrate, the copper-bismuth bimetallic catalyst is prepared through heat treatment, electrochemical reduction treatment and bismuth deposition. Meanwhile, the copper-bismuth bimetallic catalyst can not only make full use of the copper and bismuth bimetallic effect, effectively improve the activity, stability and selectivity of electrocatalytic reduction of carbon dioxide, but also has the advantages of simple and controllable preparation, wide application potential window and wide application environment.

The invention provides a three-dimensional multi-stage needle tip array type Bi-CuO integral electrode as well as a preparation method and application of the three-dimensional multi-stage needle tip array type Bi-CuO integral electrode. The integral electrode comprises foamy copper, a copper oxide needle tip array layer growing on the foamy copper and a bismuth nanosheet array layer uniformly covering the surface of a copper oxide needle tip. The integral electrode has a multi-stage self-supporting structure, so that catalyst aggregation or stacking is effectively avoided, and the specific surface area of exposed active sites is remarkably increased; and the electrode also has multiple heterogeneous interfaces, and shows excellent catalytic activity, selectivity and electrochemical window when being used as a working electrode for electrically reducing CO2 to prepare formate. The preparation method comprises the following steps: generating the copper hydroxide nanowire layer on foamy copper in situ by using a chemical oxidation method, performing annealing treatment in air to form the copper oxide needle tip array layer, and depositing the bismuth nanosheet array layer on the surface of the copper oxide needle tip by using a wet chemical method to obtain the integral electrode. The preparation method is novel and simple, the use of a binder is avoided, the operability is high, and the preparation method has a good application prospect.

The invention relates to a copper-cobalt bimetallic phosphide heterojunction and a preparation method and application thereof.The preparation method comprises the following steps that 1, pretreated foamy copper is soaked in an ammonium persulfate and sodium hydroxide solution, and the substance serves as a strong oxidant and is used for reacting to form copper hydroxide; (2) mixing cobalt nitrate hexahydrate with methanol, and putting copper hydroxide to react for two days; 3) adding dimethylimidazole for continuous reaction, and then washing, drying and phosphorizing at room temperature; compared with the prior art, the preparation method is simple in process and low in cost; the prepared catalyst has a heterojunction nanowire array structure, more active sites are provided, charge redistribution at a phosphide heterojunction interface is promoted by electron directional movement, the electron structure of the catalyst can be adjusted, and adsorption energy of reactants and intermediates on the active sites can be changed, so that reaction kinetics is promoted. The catalyst product is mainly ammonia gas, is good in stability and can be repeatedly used for multiple times.

A method of inhibiting a cancer cell growth includes contacting the cancer cell with a Cu2(OH)3NO3 / CaSiO3@g-C3N4 nanocomposite material containing graphitic carbon nitride (g-C3N4), copper hydroxide nitrate (Cu2(OH)3NO3) and calcium silicate (CaSiO3), achieving an inhibition efficiency on human breast carcinoma (MCF-7) and human hepatocellular carcinoma (HepG-2) cell growth of greater than 95% in an in-vitro cellular viability assay.

The invention provides an amino acid composite reagent system and a method for preparing high-purity copper glycinate by treating electronic waste through the amino acid composite reagent system, and belongs to the technical field of metal hydrometallurgy and resource regeneration. According to the method, an amino acid composite agent system is designed, an ammonia catalysis barrier reduction mechanism is constructed, the leaching rate is greatly increased, the double effects of copper hydroxide precipitation and glycine chelation are synchronously inhibited, and efficient dissolution of copper ions is achieved; the ammonia stability and the glycine anion activity are maintained through a narrow window regulation and control technology with the pH value being 9.5 + / -0.2, and the copper selective leaching rate is guaranteed; the method comprises the following steps: constructing a leaching solution directional crystallization process, and preparing a high-purity crystal by utilizing a self-assembly directional crystallization process of a copper glycinate chelate based on the saturation concentration of copper glycinate in the leaching solution and a stable chelation structure through precise regulation and control of three-stage crystallization. According to the process, a closed-loop crystallization system of'zero seed crystal addition and zero wastewater discharge 'of the copper-containing complex leaching solution of the electronic waste is realized.

This invention belongs to the field of catalyst technology, and relates to a flower-like multifunctional CuO@MnO2 composite material, its preparation method, and its application. The composite material constructs a flower-like core-shell structure with CuO as the core and thin-film MnO2 as the shell. The preparation method is as follows: rod-shaped copper hydroxide is added to deionized water and ultrasonically mixed to obtain a copper hydroxide suspension; potassium permanganate is dissolved in the copper hydroxide suspension and ultrasonically mixed to obtain a mixed solution B; mixed solution B is subjected to a hydrothermal reaction, and after the reaction is completed, it is cooled, washed, and dried to obtain the flower-like multifunctional CuO@MnO2 composite material. This method not only maximizes the interfacial contact area between the two phases and promotes interfacial charge transfer to achieve a synergistic catalytic effect, but also provides a MnO2 shell with good stability, forming a physical and chemical barrier for the CuO core and effectively inhibiting the excessive leaching of copper ions. Furthermore, the prepared CuO@MnO2 exhibits good catalytic performance, stability, and reproducibility.

The application provides a preparation method of a biomimetic flagelliform nanowire and relates to the technical field of nanowire material preparation. The method comprises the following steps: mixing and immersing a trithiocyanic acid solution and copper hydroxide nanowires, and obtaining immersed nanowires after drying; the immersion conditions comprise the following steps: the temperature is 20-45 DEG C, and the time is 0.01-50 min; and the obtained immersed nanowires are calcined at 250-500 DEG C for 2-6 h. The method provided by the application uses a trithiocyanic acid solution to immerse Cu(OH)2 nanowires, and then calcines in a muffle furnace. The method provided by the application is simple in operation, the prepared nanowires are uniform and controllable in morphology, and can be applied to the fields of oil-water separation, battery negative electrode current collectors, adsorption and the like.

This invention provides a one-dimensional silver nanostructure / metal hydroxide composite material, its preparation method, and its application. The preparation method includes: adding a one-dimensional silver nanostructure, a metal salt, and an additive to a solvent and stirring to disperse them evenly; adding an acidic or alkaline reagent under stirring conditions to adjust the pH of the solution, causing the metal ions in the solution to convert into metal hydroxide precipitates, obtaining a one-dimensional silver nanostructure-metal hydroxide suspension; then performing solid-liquid separation, washing and drying the obtained solid product to obtain a one-dimensional silver nanostructure / metal hydroxide composite powder; wherein the metal hydroxide is aluminum hydroxide, zinc hydroxide, magnesium hydroxide, iron hydroxide, manganese hydroxide, copper hydroxide, nickel hydroxide, or cobalt hydroxide, and the one-dimensional silver nanostructure is silver nanowire or silver nanoribbon. The resulting composite material uses metal hydroxide as a carrier and separator, inhibiting the drying and agglomeration of silver nanowires from the source, exhibiting high conductivity and good redispersibility, thus improving conductivity.

The invention discloses a method for resource utilization of copper-containing waste etching liquid and production of high-purity copper hydroxide, and belongs to the field of green cyclic recycling of copper-containing waste liquid. The method for preparing the high-purity copper hydroxide by using the copper-containing etching waste liquid comprises the following steps: mixing the copper-containing etching waste liquid with a crystal form inducer solution, adjusting the pH value to 3.0-8.0, then reacting, carrying out solid-liquid separation to obtain a solid-phase separated substance and filtrate, and carrying out aging treatment on the solid-phase separated substance to obtain a basic copper chloride precipitate; and adding ammonia water and a crystal form transforming agent into the basic copper chloride precipitate, then carrying out aging treatment, and carrying out solid-liquid separation to obtain the high-purity copper hydroxide powder. The prepared copper chloride hydroxide and copper hydroxide powder are large in particle size, the average particle size of the copper chloride hydroxide collection substance is 20-200 microns, and the average particle size of the copper hydroxide powder is 10-100 microns.

A method of producing hydrogen by an electrochemical ammonia oxidation reaction (AOR) includes disposing an anode and a cathode in an aqueous electrolyte solution including dissolved ammonia and potassium hydroxide, and applying a potential difference between the anode and the cathode. The anode includes, based on the weight of the anode from about 98.0 percent by weight (wt. %) to about 99.5 wt. % of a polycrystalline matrix including copper hydroxide and from about 0.5 wt. % to about 2.0 wt. % of nanoparticles of crystalline platinum (Pt) dispersed in the polycrystalline matrix.

The invention discloses a preparation method for in-situ growth of a conductive Cu-based MOF on a copper current collector and application thereof, and the preparation method comprises the following steps: mixing a sodium hydroxide solution and an ammonium persulfate solution, placing the copper current collector in the obtained mixed solution to obtain the copper current collector with a copper hydroxide nanowire grown on the surface, and carrying out in-situ growth of the conductive Cu-based MOF on the copper current collector to obtain the conductive Cu-based MOF. The preparation method comprises the following steps: preparing a copper current collector, placing the copper current collector in a ligand solution obtained by dissolving HHTP or HITP.6HCl in a solvent, reacting at 60-70 DEG C, cleaning and drying the copper current collector after the reaction is completed, and then activating at 100-200 DEG C to obtain the copper current collector on which the conductive Cu-based MOF grows in situ. The conductive Cu-MOFs constructed on the surface of the copper current collector in situ are generated through reaction in the solution, the reaction condition is mild, the preparation process is simple, coating after slurry preparation is not needed, the preparation period is short, the problem that large-scale preparation cannot be carried out can be solved, and commercialization is expected to be achieved.

The invention discloses a heavy metal emission reduction and sludge reduction treatment process method for circuit board wastewater. The invention provides a layered precipitation strategy of'first acid, second alkali and second sulfur '. The method comprises the following steps: performing acid precipitation on alkaline organic wastewater by using acidic wastewater, and recovering printing ink residues; carrying out air stripping treatment on the copper ammonia wastewater by utilizing an alkaline condition, and precipitating high-purity copper hydroxide; and finally, carrying out deep precipitation on residual complexing heavy metals by utilizing excessive sulfides in the pretreatment stage, and further recovering copper resources in the comprehensive water tank through coprecipitation of copper hydroxide and copper sulfide. Sludge generated in each process is classified and treated; printing ink slag, biochemical residual sludge and copper / nickel sulfide sludge are subjected to synergistic pyrogenic process treatment; copper hydroxide sludge is selectively subjected to acid dissolution to prepare copper sulfate. Lime, ferrous sulfate and polyaluminum are not used in the whole process. According to the method, the medicament is utilized to the maximum extent, the sludge is reduced by 50% or above, and the resource value of valuable metal is increased by 3-5 times.

The invention belongs to the technical field of non-ferrous metal smelting environmental protection, and particularly relates to a silver nitrate electrolytic waste liquid regeneration and copper recovery method which comprises the following steps: (1) heating silver-containing electrolytic waste liquid, dropwise adding a sodium hydroxide solution to react in a stirring state, and filtering to obtain copper-removed filtrate and copper hydroxide precipitate; (2) heating the copper-removed filtrate, dropwise adding a sodium hydroxide solution to react under a stirring state, and filtering to obtain filtrate and silver hydroxide precipitate; and (3) adding the silver hydroxide precipitate into a nitric acid solution to prepare the silver nitrate electrolyte. According to the method, a sodium hydroxide solution is added into the silver-containing waste electrolyte, copper ions and silver ions in the silver nitrate waste electrolyte respectively react with sodium hydroxide to generate a copper hydroxide precipitate and a silver hydroxide precipitate through graded regulation and control of the pH value, and the silver hydroxide precipitate is regenerated into a silver nitrate solution after nitric acid is added into the silver hydroxide precipitate. The method is easy and convenient to operate, good in impurity removal effect and high in copper recovery rate.

The invention discloses preparation and application of a nano enzyme. The preparation method of the nano enzyme comprises the following steps: dissolving copper salt and hydroxy anthraquinone carboxylic acid in water to obtain a first solution; adjusting the pH of the first solution to be alkaline, and heating for reaction to obtain a product solution; and centrifuging the product solution, taking the precipitate, washing and drying to obtain the Cu nano-enzyme. The copper salt comprises at least one of copper sulfate, copper chloride, copper nitrate and copper hydroxide; the hydroxy anthraquinone carboxylic acid is rhein. According to the invention, Cu is used as a transition metal source and reacts with specific hydroxy anthraquinone carboxylic acid to prepare the Cu nano-enzyme (Cu-Rhein) with excellent peroxidase-like activity. The Cu nano enzyme can be applied to promotion of hydrogen peroxide oxidation TMB color development and detection of penicillamine, the accuracy of penicillamine detection is high, and the Cu nano enzyme has good application prospects.

A method for recycling silver from a waste IC chip include: heating to disassemble an IC chip, and crushing the IC chip into powders; adding the powders to a nitric acid solution, heating, centrifuging and collecting a first filtrate; adding soluble starch to the first filtrate, where a mass concentration ratio of the soluble starch to Fe in the first filtrate is 5.20-7.30; heating a resulting mixture to 130-175° C. for a first hydrothermal reaction, separating a precipitate from the first hydrothermal reaction and collecting a second filtrate; heating the second filtrate to 160-230° C. for a second hydrothermal reaction, separating a solid from the second hydrothermal reaction and collecting a third filtrate; drying, grinding, and sieving the solid to obtain silver powders; and adding alkali to the third filtrate to form a precipitate of Cu, and separating the precipitate to yield copper hydroxide.

The application discloses a preparation method and application of a three-dimensional electrode loaded with copper oxide nanowires. The method comprises the following steps: firstly, cleaning the copper foam; then, placing the copper foam into a solution to perform an oxidation reaction to obtain a copper hydroxide nanowire / copper foam composite material; and finally, taking the above-mentioned precursor as a template to prepare a copper oxide nanowire / copper foam composite material rich in oxygen vacancies through a hydrothermal reaction. The one-dimensional copper oxide nanowire structure rich in oxygen vacancies can significantly improve the specific surface area and adsorption capacity of a catalytic electrode, optimize the active species generation rate and charge transfer capacity, so that the catalytic electrode has a lower initial potential and Tafel slope in glycerol electro-oxidation reaction, and has excellent formate selectivity.

This invention discloses a method for preparing copper-doped nickel-iron-manganese precursor materials and their corresponding sodium-ion battery cathode materials. By pre-adding a specific amount of complexing agent to a mixed metal salt solution to create a micro-complexed solution, the concentration of free metal ions is reduced to a certain extent, slowing down the release rate of metal ions and reducing the possibility of rapid hydroxide formation and oxidation, thus improving the stability of the preparation process. When copper ions are used for doping, the incompatibility problem of copper hydroxide can also be solved. In other words, this invention, through optimized complexation processes combined with special anti-oxidation measures, prepares multi-component precursor materials with uniform phase, uniform particle size, and excellent morphology, as well as corresponding sodium-ion battery cathode materials. Furthermore, this invention has the advantages of a short preparation process, low cost, and simple operation.

The utility model relates to the technical field of pretreatment, in particular to a copper hydroxide mud filter-pressing pretreatment device which comprises an inner cylinder and a middle cylinder, a large-aperture filter hole is formed in the middle upper portion of the side wall of the inner cylinder and located at the position of supernate, and a small-aperture filter hole is formed in the middle of the side wall of the inner cylinder and close to the height of solid-liquid layering. The middle cylinder is inserted into the outer side of the inner cylinder in a sleeving manner, the inner wall of the middle cylinder is in sliding contact with the outer wall of the inner cylinder, all the filter holes are shielded when the middle cylinder moves downwards, and at the moment, a relatively closed space is defined by the middle cylinder and the inner cylinder; at the moment, mixing, pH value adjustment and flocculation precipitation work of the slurry can be completed in the space, the middle cylinder is lifted up after layering is completed, all or part of the filter holes are exposed, supernate can be rapidly discharged, and part of liquid in a solid layer is discharged.

The invention provides a method for producing copper hydroxide by using electroplating sludge. The invention relates to a method for producing copper hydroxide by using electroplating sludge, which comprises the following steps: (1) pulpifying: adding slag washing water into a pulpifying tank, slowly adding the electroplating sludge into the pulpifying tank, and starting stirring at the liquid-solid ratio of (2.5-3): 1 and the temperature of 40-70 DEG C for 5-8 hours; according to the method, the filtrate obtained in the step (2) is pumped into the primary iron removal kettle through the pump, meanwhile, hydrogen peroxide and sodium carbonate are added into the iron removal kettle to adjust the PH value, oxidation neutralization and chemical precipitation can be carried out, and impurity metals such as iron and chromium contained in the filtrate are removed; meanwhile, filter residues generated by leaching and filter residues generated by primary iron removal enter a leaching residue washing kettle and an iron residue washing kettle respectively, residue washing water and sulfuric acid are pumped into the washing kettles, leaching residues and iron residues are subjected to acid pickling, and iron ions carried in the solution can be more sufficiently removed.

The invention discloses rapid synthesis and application of a novel alkali-resistant copper phosphate haloperoxidase mimic enzyme. The CPN shows excellent catalytic performance in an alkaline range (pH 8-12), and has excellent stability and reusability. More importantly, after the CPN is stored for 50 days under an alkaline condition, the activity of the CPN is hardly influenced. In an alkaline environment, copper ions on the surface of the CPN can be slowly converted into copper hydroxide, but due to the fact that copper hydroxide and copper phosphate have similar catalytic activity, the surface conversion cannot damage the overall catalytic activity of the material. The discovery breaks through the theoretical framework that a copper-based material is inevitably inactivated under an alkaline condition in traditional cognition, and a brand new mechanism of'dynamic surface conversion-activity maintenance 'is proposed for the first time. CPN can be used for sterilization, inhibition of biofilm formation, prevention of adhesion of bacteria on the surface of a plastic product and rapid detection of pollutants. In addition, other insoluble copper salts such as copper sulphide also have haloperoxidase activity.