55 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 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 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.

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.

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.

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 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 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 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 relates to a catalyst for hydrogen production through seawater electrolysis based on a metal ruthenium-doped copper nanowire composite structure and a synthesis method thereof, and belongs to the technical field of catalysis, the catalyst is composed of a copper nanowire skeleton derived from foamy copper and metal ruthenium clusters uniformly distributed on the surface of the copper nanowire skeleton; the method comprises the following steps: placing foamy copper in a solution containing sodium hydroxide and an oxidizing agent to generate a copper hydroxide nanowire; metal ruthenium is introduced by dipping in a solution containing ruthenium salt; and carrying out inert atmosphere heat treatment and electrochemical reduction to obtain the ruthenium-cluster-loaded copper nanowire composite catalyst. The fine regulation and control of the structure and components of the catalyst are realized by adjusting the concentration of the reaction solution, the dipping time and the treatment conditions. The electrocatalyst shows excellent hydrogen evolution activity and long-term stability under the acidic seawater electrolysis condition, the problems that a nickel-based current collector is prone to corrosion in an acidic medium and a traditional platinum-based catalyst is prone to inactivation in natural seawater are effectively solved, and a new technical scheme is provided for efficient and stable seawater electrolysis hydrogen production.

This invention specifically relates to an oleophobic coating, an oleophobic coating layer, and their applications. The oleophobic coating comprises component A and component B; component A is formed by dispersing fillers in a matrix, the fillers including a composite filler composed of titanium dioxide particles and copper hydroxide particles; the matrix includes a binder and a solvent; the mass ratio of filler to binder is (2-5):10; the volume percentage of binder in the matrix is ​​20-40%; component B is a curing agent. This coating exhibits good oleophobic properties, is suitable for the high water-content atmosphere of oil well produced fluids, and is easy to mass-produce and industrialize.

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.

A method of absorption includes contacting a copper hydroxide nitrate / calcium silicate / graphite-phase carbon nitride [Cu2(OH)3NO3 / CaSiO3@g-C3N4] nanocomposite catalyst with a solution including one or more pollutants. Further, the method includes absorbing the one or more pollutants on the Cu2(OH)3NO3 / CaSiO3@g-C3N4 nanocomposite catalyst.

The invention provides a copper element recovery method which comprises the following steps: mixing copper-containing silicon powder with an acid solution, carrying out acid pickling treatment, and removing silicon powder precipitate to obtain a copper-containing acid pickling solution; adding an oxidizing agent and an alkaline solution into the copper-containing pickling solution, adjusting the pH value of the system to 3-5, and removing iron-containing precipitate to obtain copper-containing filtrate; and sequentially concentrating the copper-containing filtrate, and adjusting the pH value to be alkaline, so as to obtain a copper hydroxide precipitate. The effects of improving the resource utilization rate, reducing the production cost and realizing green chemical engineering are achieved.

This invention discloses an ecological slow-release algaecide and its preparation method, relating to the field of water treatment technology. The algaecide comprises 30%-50% copper oxychloride, 5%-50% basic copper carbonate, 5%-50% copper hydroxide, 5%-50% copper oxalate, 8%-12% copper sulfate pentahydrate, 2%-8% calcium sulfate dihydrate, 2%-8% oxalic acid dihydrate, 9%-18% pregelatinized starch, and 1.5%-2% magnesium stearate. The preparation method includes: weighing and mixing the components; pulverizing the mixed powder, sieving, and drying in an oven; and pressing the dried powder into tablets. This invention features a simple preparation process and low raw material costs. The algaecide of this invention has stable and long-lasting release, effectively reducing the frequency of algaecide application, and ensuring that the copper ion concentration in the water does not exceed the standard, greatly reducing the risk of water pollution caused by excessive algaecide application, while also reducing the labor costs associated with long-term algaecide application.

The present application relates to the technical field of industrial wastewater recycling treatment, solves the problem of low resource utilization efficiency and difficulty in directional recovery of multiple components in the existing technology of tin stripping waste liquid, and provides a tin stripping waste liquid treatment method and system for component qualitative recovery. The method comprises: carrying out aeration treatment on the tin stripping waste liquid to be treated and controlling the pH within a preset pH range; adding liquid alkali and mixing with a flocculating agent and pressure filtration to obtain tin hydroxide precipitate and first pressure filtrate; introducing the first pressure filtrate meeting the preset condition into a second reaction tank, adding liquid alkali and activated carbon to the second reaction tank for neutralization and primary copper precipitation treatment, obtaining copper hydroxide precipitate and collecting primary copper precipitation filtrate; introducing the primary copper precipitation filtrate into a third reaction tank for secondary copper precipitation treatment and then pressure filtration to obtain copper sulfide precipitate and sodium salt raw liquid; and distilling and centrifuging the sodium salt raw liquid to obtain sodium nitrate product. The present application realizes the qualitative recovery of multiple components in the tin stripping waste liquid.

The application discloses a high-nickel-content copper concentrate recovery method and relates to the technical field of copper concentrate recovery. The high-nickel-content copper concentrate is used for selective nickel removal in cooperation with yellow slag. The copper molar content in the form of copper hydroxide phase in the high-nickel-content copper concentrate is generally greater than 50% of the nickel molar number in the copper concentrate. The purpose of selective nickel removal can be achieved by cooperating with the yellow slag for acid leaching. The cooperation of the high-nickel-content copper concentrate and the yellow slag can greatly improve the process productivity, increase the economic benefits, and realize high-value utilization of copper and nickel.

The invention discloses a nanorod-shaped Cu (OH) 2 / CF self-supporting electrocatalyst as well as a preparation method and application thereof, and belongs to the technical field of electrocatalytic materials. The invention aims to solve the technical problems that the NO3RR reaction path is complicated, and copper easily adsorbs intermediates such as NO3, NO2 and NH2, so that the intermediates are hindered from being completely reduced into ammonia. The electrocatalyst is composed of a foamy copper framework and copper hydroxide nanorods growing on the foamy copper framework in situ. The preparation method comprises the following steps: washing and drying the clean foamy copper, soaking the foamy copper in a mixed aqueous solution of ammonium persulfate and sodium hydroxide, growing the copper hydroxide nanorod, and washing and drying to obtain the final material. As a cathode for electro-catalysis ammonia production, the cathode is used for electro-catalysis nitrate ammonia synthesis reaction. The copper hydroxide uniformly and vertically grows on the foamy copper skeleton in the form of the nanorod, and the nanorod can expose more catalytic active sites, is higher in strength and more stable, and can be used as an electrocatalyst for electrocatalysis of a nitrate synthesis ammonia reaction without subsequent heat treatment.

This invention discloses a water-saving, energy-saving, and environmentally friendly copper-based catalyst, its preparation method, and its application. The preparation method includes stirring and mixing copper hydroxide and a support, followed by drying to obtain the water-saving, energy-saving, and environmentally friendly copper-based catalyst. Under the conditions of less than 2 mL of water consumption per gram of catalyst, no waste gas or waste liquid generation, and a total process temperature below 250℃, this invention prepares a catalyst containing highly dispersed copper oxide species. Furthermore, the preparation method is simple, requires minimal equipment, consumes little water, is energy-saving and environmentally friendly, and uses inexpensive and readily available raw materials, thus showing promising prospects for industrial application.

The present application relates to a kind of phase change heat storage materials based on biomimetic polymerization technology and preparation method thereof.The present application first prepares copper hydroxide colloidal particle stable suspension, then forms polydopamine covering layer on the surface of copper oxide colloidal particle by biomimetic polymerization, then drops dilute hydrochloric acid into the suspension, makes copper hydroxide colloidal particle dissolve and release copper ions, and forms interconnected pores in polydopamine.On this basis, reducing agent is added to the solution, and copper ions are reduced to copper nanoparticles by simple in-situ reduction technology, obtaining copper nanoparticle-doped three-dimensional porous polydopamine, and then preparing high-load and high-thermal-conductivity shaped phase change heat storage materials with it as carrier.The phase change heat storage material of the present application has high energy storage density and good thermal conductivity, and can be used for solar energy storage and utilization, industrial waste heat utilization or building energy saving, and makes positive contribution to the realization of the important strategic goal of "carbon peak" and "carbon neutralization" of the country.

This invention relates to the field of electronic materials technology, and discloses a spherical shell copper sulfide powder material and its preparation process. The preparation process includes: mixing copper hydroxide with additives and grinding, followed by multi-stage temperature calcination to obtain copper oxide; dispersing copper oxide in water, adding a sulfur source solution to react and generate copper sulfide; and obtaining the spherical shell copper sulfide powder material through solid-liquid separation, washing, drying, and granulation. The additives are sodium sulfate or sodium chloride, added at 3%–10% of the mass of copper hydroxide; the sulfur source is sodium sulfide or sodium hydrosulfide, with a copper-sulfur molar ratio of 1:1 to 1:2; calcination is performed in multiple temperature zones below 200℃, 200–300℃, 300–400℃, and 450–500℃, followed by annealing; the solid content of copper oxide in the reaction is ≤20%, the concentration of the sulfur source is ≤20%, and the stirring speed is controlled in stages. This process is mild, uses safe raw materials, and has a simplified procedure. The obtained powder material has a hollow spherical shell structure and can be used to prepare infrared interference or shielding materials.

The application discloses copper oxide nanosheets, a preparation method and application thereof. The preparation method comprises the following steps: dispersing layered copper hydroxide acetate in an intercalation agent solution to perform ion exchange; adjusting the solution obtained after the ion exchange to be alkaline, and heating to reflux to obtain black precipitate; and washing and drying the black precipitate to obtain the copper oxide nanosheets. The method has mild conditions, and the copper oxide nanosheets prepared by the method have large lateral size and thin thickness, and can be well used in optical limiting devices.

Manufacturing methods for copper hydroxide, cuprous oxide, and cupric oxide nanocomposites with graphene nanoplatelets are described, using high-intensity or ultrasonic mixing treatments of graphite and copper hydroxide precursor salts in water. Intermediate copper hydroxide reaction compounds are modified to cupric oxide-graphene, and this is further modified to cuprous oxide-graphene. The resulting binary compounds are successfully used as materials for measuring glucose and hydrogen peroxide content in aqueous solutions, serving as non-enzymatic biosensors for these molecules.

The invention relates to the technical field of catalyst preparation, and discloses a copper-based catalyst prepared by double hydrolysis coprecipitation and a preparation method thereof, and a method for preparing octenol, the copper-based catalyst comprises an active component copper and a dispersant alumina, and does not contain an impurity copper hydroxide, and the most probable pore size of the copper-based catalyst is 18-40 nm. By adopting the large-aperture copper-based catalyst disclosed by the invention, the conversion rate of octenal and the yield of octenol can be improved, in addition, the preparation process is simple, the raw material resources for preparing the copper-based catalyst are rich, and the preparation cost of the catalyst is further reduced.