1056 results about "Nickel salt" patented technology

The present application relates to the field of wastewater treatment, and provides a treatment system and method for electroless nickel-plating waste liquid. The treatment system comprises a decomplexing pretreatment system; an oxidation-decomplexing system comprising a redox reactor and a decomplexing reactor which are connected in sequence, wherein an oxidizing agent in the redox reactor is oxygen, and an oxidizing agent in the decomplexing reactor is hydrogen peroxide; a chemical precipitation system comprising a neutralization reaction tank and a sedimentation tank which are connected in sequence, wherein the sedimentation tank is equipped with a filter system; and an evaporation crystallization system comprising an evaporation device, a crystallization device, and a separation device which are arranged in sequence. In the treatment system and method for electroless nickel-plating waste liquid, a two-stage oxidation method is employed to achieve oxidation and decomplexing of the waste liquid; in addition, combining chemical precipitation treatment and evaporation crystallization treatment not only reduces the waste liquid treatment cost but also avoids the introduction of other impurities, and allows for the separation of nickel salts and phosphate salts, so that the operation is easy and convenient, the treatment cost is low, the nickel removal rate is high, and resource utilization of nickel is facilitated.

The invention provides a lead-free high-phosphorus chemical nickel plating solution, and relates to the technical field of chemical nickel plating, and the lead-free high-phosphorus chemical nickel plating solution comprises the following components: 4-10 g / L of nickel salt, 6-12 g / L of a complexing agent, 0.1-0.8 g / L of a brightener, 8-12 g / L of a reducing agent, 0.4-0.8 g / L of a stabilizer, 1-5 g / L of a plating starting agent, 0.1-0.6 g / L of an anti-cracking agent, 0.5-1.5 g / L of an accelerator and 0.1-0.5 g / L of a wetting agent. The excellent chemical nickel-plating process of the circuit board and the carrier plate can be realized, and the chemical nickel-plating solution has the characteristics of high deposition rate, excellent stability, brightness, smoothness, no skip plating or diffusion plating, excellent binding force and the like.

The invention discloses a nickel-iron-based bimetallic organic framework catalyst and a preparation method thereof, and belongs to the field of electrochemical catalyst preparation, the preparation method comprises the following steps: step 1, dissolving a metal nickel salt in pure water, and carrying out ultrasonic dispersion to obtain a solution A; the preparation method comprises the following steps: dissolving a ferrocene dicarboxylic acid ligand in N, N-dimethylformamide to obtain a solution B; ultrasonically stirring and uniformly dispersing the solution A and the solution B to obtain a mixed solution; and 2, synthesizing the nickel-iron-based bimetallic organic framework catalyst from the mixed solution by using a hydrothermal method. The nickel-iron-based bimetal organic framework catalyst prepared by the preparation method disclosed by the invention shows good OER catalytic performance in an alkaline medium.

The invention relates to a lightweight porous nickel ferrite composite electromagnetic absorbing material and a preparation method thereof, and belongs to the field of electromagnetic wave absorbing materials, and the lightweight porous nickel ferrite composite electromagnetic absorbing material is a porous electromagnetic absorbing material prepared by high-temperature annealing of a mixture containing ferric salt, nickel salt, an acetic acid solution and chitosan. The lightweight and porous nickel ferrite composite electromagnetic absorbing material has both lightweight and electromagnetic absorbing properties.

The invention relates to a preparation method of a cobalt-free single crystal lithium-rich positive electrode material. The preparation method comprises the following steps: preparing a nickel-manganese oxygen-containing compound precursor from manganese salt and nickel salt by using a solid-phase method or a coprecipitation method; mixing the prepared nickel-manganese oxygen-containing compound precursor with a low-melting-point lithium source, pre-sintering and melting the mixture, performing high-energy ball milling, adding a conventional lithium source once or multiple times during ball milling, and calcining the mixture after ball milling to obtain an initial product of the cobalt-free single crystal lithium-rich positive electrode material; and carrying out acid treatment and secondary calcination on the initial product to obtain the cobalt-free single crystal lithium-rich positive electrode material product. The single crystal lithium-rich material with excellent performance can be prepared with high efficiency and low cost, and has excellent electrochemical performance.

The invention discloses a method for preparing an iron-nickel-molybdenum-based electrocatalyst through combination of electrodeposition and rapid Joule heat and application of the method. The method comprises the steps that S1, a porous nickel substrate is pretreated, and the pretreated porous nickel substrate is obtained; s2, obtaining a nickel salt solution, a molybdenum salt solution and a ferric salt solution; s3, obtaining a mixed solution; s4, putting the mixed solution serving as electrolyte into a dual-electrode electrolytic tank, carrying out electro-deposition treatment by taking the pretreated porous nickel substrate as a cathode and an inert electrode as an anode, and washing and drying to obtain a Fe-Ni-Mo-LDH precursor; and S5, carrying out Joule thermal pyrolysis treatment on the Fe-Ni-Mo-LDH precursor, so as to obtain the iron-nickel-molybdenum based electrocatalyst. The preparation method can effectively regulate and control the size structure of the catalyst, and is suitable for preparing iron-nickel-molybdenum-based electrocatalysts with different substrates and different sizes; and the electrocatalyst has the advantages of uniform and stable nanostructure and high loading capacity. Meanwhile, the preparation method is short in reaction time, high in heating efficiency, high in repeatability and suitable for industrial large-scale production.

The invention relates to the technical field of electroplating, and particularly discloses a nickel-tungsten-phosphorus plating layer electroplating process which comprises the following steps: S1, preparing a nano composite electroplating solution which comprises nickel salt, tungstate, hypophosphite, nano silicon carbide powder, ZIF-67 (at) MXene core-shell nanosheets, a composite complexing agent and water; s2, plasma mixed gas is adopted for conducting etching treatment on the surface of the workpiece to be plated; s3, electroplating the to-be-electroplated workpiece subjected to surface treatment under the action of pulse current and an alternating magnetic field, and performing ultrasonic stirring on the composite electroplating liquid in the electroplating process; and S4, under nitrogen protection, the workpiece is subjected to annealing treatment. According to the electroplating process, through the synergistic effect of the nano SiC and the ZIF-67 (at) MXene, the component uniformity and the structural compactness of the nickel-tungsten-phosphorus coating can be effectively improved, and then the corrosion resistance of the nickel-tungsten-phosphorus coating in the complex oil gas environment is effectively improved.

The invention relates to the technical field of electro-catalysis and hydrogen energy, in particular to a modified LDH-based catalyst and a preparation method and application thereof. The preparation method comprises the following steps: mixing trimesic acid, water, an organic solvent, a nickel salt, a cobalt salt and an iron salt, carrying out electro-deposition, washing and drying to obtain a NiFeCo-LDH (TA) catalyst; the preparation method comprises the following steps: soaking a NiFeCo-LDH (TA) catalyst in a silver salt solution, washing and drying to obtain the modified LDH-based catalyst. The modified LDH-based catalyst provided by the invention can effectively resist chloride ion corrosion and inhibit dissolution of active metals in layered double hydroxides (LDH) under high current density in seawater, can reach industrial grade current density under relatively low overpotential, and can stably run for more than 1000 hours.

The invention discloses a cathode roller with a honeycomb surface structure. A precise honeycomb micro-pattern structure is arranged on the surface of the cathode roller. The invention also discloses a method for manufacturing alloy foil by using the cathode roller, which comprises the following steps: dissolving ferric salt in ultrapure water to obtain a ferric salt solution; dissolving nickel salt in ultrapure water to obtain a nickel salt solution; mixing the two solutions and filtering; preparing various additive solutions, mixing all the additive solutions with the obtained iron-nickel solution to obtain an electrolyte, filtering the electrolyte, and transferring the filtered electrolyte into an electrolytic cell of a crude foil engine; and applying current to a cathode roller and an anode plate which are separately arranged in the electrolytic bath, electrically depositing iron and nickel on the surface of the cathode roller, and rolling through a roll-to-roll process to obtain the iron-nickel alloy foil. The alloy foil manufactured by the method has the characteristics of low surface roughness, high tensile strength and high ductility.

The invention relates to the technical field of new energy materials, in particular to a metal oxide heterojunction catalyst and a preparation method and application thereof in hydrogen peroxide production. The preparation method comprises the following steps: taking soluble zinc salt and urea as raw materials, carrying out hydrothermal reaction to obtain zinc oxide, then taking soluble nickel salt and zinc oxide as raw materials, carrying out coprecipitation reaction under the action of ammonium bicarbonate, and calcining in air to obtain the metal oxide heterojunction catalyst. The preparation steps are simple and convenient, the product is prepared in the air atmosphere, in the obtained metal oxide heterojunction catalyst, the surfaces of the zinc oxide microspheres are uniformly coated with the nickel oxide nanosheets, the specific surface area is large, the number of active sites is large, the nickel oxide nanosheets and the zinc oxide microspheres form a heterojunction structure, and the metal oxide heterojunction catalyst has good catalytic activity. The defects of a catalyst for producing hydrogen peroxide through electro-catalysis water oxidation and a preparation method in the prior art are overcome.

The invention relates to a sunken porous magnetic alloy ball wave-absorbing material and a preparation method and application thereof.The wave-absorbing material is prepared through the following steps that S1, citric acid, soluble ferric salt, soluble cobalt salt and soluble nickel salt are dissolved in a mixed solvent of ethylene glycol and water, and the mixture is fully stirred to form a uniform mixed solution; and S2, the mixed solution obtained in the step S1 is subjected to spray drying, obtained precursor powder is placed in the air atmosphere to be calcined to remove the carbon source, then the precursor powder is placed in the H2 / Ar atmosphere to be subjected to heating reduction, and the porous FeCoNi alloy balls with the surface pits are obtained and are the target product. The surface of the prepared alloy microsphere has an obvious concave structure, magnetic anisotropy and magnetic performance are enhanced, a small number of pores are generated in the reduction process, impedance matching of the material is optimized, and effective high-frequency electromagnetic absorption is achieved; and due to the synergistic effect of the recesses and the pores, the obtained alloy microspheres have obvious lightweight characteristic, and have good application prospects in the field of electromagnetic absorption.

The invention discloses a preparation method of a rare earth element doped nickel-based selenide nano-material and application of the rare earth element doped nickel-based selenide nano-material in electro-catalysis water full-hydrolysis reaction. According to the method, nickel salt, cerium salt, selenium dioxide and potassium chloride are prepared into electrolyte, and the electrolyte is subjected to electro-deposition on a foamed nickel substrate to obtain Ce-doped Ni0.85Se nanoparticles growing on foamed nickel. The crystal structure and electron distribution of Ni0.85Se are optimized by doping trace rare earth element cerium, so that the HER and OER performances of the Ni0.85Se are greatly improved. The prepared catalyst is self-supporting closely-packed nanoparticles, the formed amorphous structure is easy to expose more active sites, the catalyst has good electrocatalytic hydrogen evolution and oxygen evolution performance under alkaline conditions, the overpotential in electrocatalysis of nickel-based selenide is greatly reduced, and the electrocatalytic performance of nickel-based selenide is improved. And excellent electro-catalytic activity is shown in electro-catalytic water full hydrolysis. And the self-supporting electrode is not easy to fall off due to generation of bubbles in the reaction process, so that the working stability of the catalyst is improved.

The present invention discloses a layered metal hydroxide composite catalytic material, its preparation method and application. The composite catalytic material comprises a carrier carbon nanotube and a metal hydroxide loaded on the carbon nanotube, and the metal is iron, cobalt and nickel. Preparation method: (1) Dissolve nickel salt, cobalt salt, iron salt and urea in an alcohol solution, stir evenly, then add carbon nanotubes, and continue to stir evenly to obtain a mixed solution; (2) Carry out a solvothermal synthesis reaction on the mixed solution obtained in step (1), filter, wash and dry after the reaction is completed to obtain the layered metal hydroxide composite catalytic material. The carbon nanotubes are introduced into the layered metal hydroxide in this composite catalytic material, reducing the precipitation of metal ions, avoiding the aggregation of hydroxides, improving the stability and catalytic activity of the catalytic material, and being used for activating persulfate to degrade organic pollutants, realizing the efficient activation of persulfate so as to improve the degradation rate of pollutants.

The invention discloses a Prussian blue analogue electrode and a preparation method and application thereof.The preparation method comprises the following steps that a manganese salt solution, a nickel salt solution and a potassium ferricyanide solution are prepared and added into water at the same time, a mixture with the molar ratio of manganese to nickel being larger than or equal to 0.1: 1 is obtained, aging, washing and drying are conducted, and the Prussian blue analogue electrode is obtained. And mixing the manganese-doped Prussian blue analogue with a binder, a conductive agent and a solvent, carrying out ultrasonic treatment to obtain an electrode slurry liquid, covering the surface of a current collector with the electrode slurry liquid, and drying to obtain the Prussian blue analogue electrode. The Prussian blue analogue electrode prepared by the method has the advantages of low energy consumption, high salt adsorption capacity, high salt adsorption rate and the like, can be used for desalting treatment as a capacitive deionization cathode, has the salt adsorption rate and the salt adsorption capacity which are more than two times of those of a conventional electrode, and is high in use value, good in application prospect and wide in application prospect. The method is of great significance in promoting wide application of the capacitive deionization technology.

The invention discloses a preparation method of a carbon shell confinement type nickel-bismuth-titanium composite catalyst and application of the carbon shell confinement type nickel-bismuth-titanium composite catalyst in high alcohol synthesis, and belongs to the technical field of catalysts. The preparation method of the carbon shell confinement type nickel-bismuth-titanium composite catalyst comprises the following steps: dissolving nickel salt, titanium dioxide and citric acid in water to form a homogeneous solution; adding bismuth salt into the homogeneous solution, and drying to obtain a precursor; and roasting the precursor to obtain the carbon shell confinement type nickel bismuth titanium composite catalyst. The carbon shell confinement type nickel-bismuth-titanium composite catalyst provided by the invention shows excellent catalytic performance in a reaction system for synthesizing high-carbon alcohol through carbon-carbon coupling of water-phase alcohol molecules. According to the catalyst, the high-carbon alcohol yield can reach 45.04% while high organic phase selectivity is maintained, and compared with a traditional nickel-bismuth-based catalyst, the high-carbon alcohol yield is remarkably improved.

The application discloses a preparation method of a catalyst for liquid-phase refining of crude octanol, and the preparation method comprises the following steps: (1) mixing pretreated fly ash and pseudo-boehmite, adding deionized water and nitric acid, stirring until a colloid is formed, drying the colloid, mixing the dried colloid with kaolin, and obtaining a carrier through kneading, extrusion molding, drying and calcination; (2) taking a nickel salt, a manganese salt and a zinc salt as active components, taking a calcium salt as an auxiliary component, dissolving the active components and the auxiliary component in deionized water to obtain a salt solution, adding n-hexane into the salt solution and stirring uniformly to prepare an impregnation solution, immersing the carrier in the impregnation solution, and obtaining the catalyst through washing, drying and calcination. The catalyst prepared by the method is mainly used in a liquid-phase refining reaction process of crude octanol, and has high activity stability and selectivity.

The invention belongs to the technical field of new energy and electrochemistry, and particularly relates to a corrosion-resistant structured transition metal alloy electrode suitable for hydrogen production from alkaline water and a preparation method of the corrosion-resistant structured transition metal alloy electrode. The method comprises the following steps: sequentially carrying out sand blasting treatment and electrochemical activation treatment on a nickel net substrate so as to improve the surface roughness and the number of active sites; and then performing constant-current deposition in an electro-deposition solution containing nickel salt and ferric salt and / or cobalt salt, and constructing a nickel-based alloy catalyst layer in a micron array shape to obtain the alloy electrode. Through observation of a scanning electron microscope, the surface of the obtained electrode has a sphere-like microstructure, the arrangement is compact, and the catalytic efficiency and durability can be improved. The prepared structured alloy electrode has the advantages of being high in interface bonding force, high in electro-catalytic performance, high in alkali corrosion resistance and the like, and is suitable for efficient and long-term operation of hydrogen production through alkaline electrolysis of water.

The invention discloses a lead-free phosphorus chemical nickel plating solution, and relates to the field of chemical nickel plating, and the lead-free phosphorus chemical nickel plating solution comprises the following components: 6-10 g / L of nickel salt, 5-10 g / L of a complexing agent, 1-5 g / L of a brightener, 5-12 g / L of a reducing agent, 0.6-0.9 g / L of a composite stabilizer, 2-10 g / L of a plating starting agent, 0.1-0.6 g / L of a hydrogen evolution preventing agent and 30-60 mg / L of a surfactant. The adopted plating starting agent is high in decomposition capacity, after the service cycle is increased to 4 MTO, the problem that decomposition products are accumulatively increased to a certain degree to cause blackening of a plating layer can be relieved, 5-6 MTO can be achieved, meanwhile, the adopted composite stabilizer is a composition composed of an aminopyrrole carboxylic ester compound and an aminothiazole carboxylic ester compound, and the composite stabilizer has the beneficial effects of being environmentally friendly and free of pollution. The stability of traditional elements such as lead and cadmium can be improved, and the problem that the service cycle of stabilizers such as benzotriazole or sodium thiosulfate is short can be solved.

The invention belongs to the technical field of water electrolysis hydrogen production, and particularly relates to a NiRuM / C catalyst for anion exchange membrane water electrolysis as well as a preparation method and application of the NiRuM / C catalyst. The NiRuM / C hydrogen evolution catalyst is prepared by adopting two ways: one way is a coprecipitation method: firstly coating a carbon carrier with amorphous nickel salt by utilizing coprecipitation, and then preparing the NiRuM / C catalyst by utilizing precipitation dissolution equilibrium movement; and 2, a group anchoring method: dispersing metal salts such as nickel, ruthenium and the like and the dopamine hydrochloride surface functionalized carbon material in a polar solvent, and preparing the NiRuM / C catalyst through coordination interaction and self-polymerization reaction of dopamine molecules. The invention provides two preparation ways of the NiRuM / C material with alkaline hydrogen evolution performance better than that of a platinum-based material, and the NiRuM / C material is applied to anion exchange membrane water electrolysis hydrogen production, so that the problems of complex process, high price, low hydrogen production efficiency, poor durability and the like of the existing preparation technology are solved.

The invention discloses an efficient NiMo-Co MOF alkaline electrolysis water electrode and a preparation method thereof.The efficient NiMo-Co MOF alkaline electrolysis water electrode comprises a nickel net, a NiMo deposition layer deposited on the nickel net and a Co MOF deposition layer deposited on the NiMo deposition layer, and during preparation, the nickel net is pretreated firstly; dissolving a nickel salt, a molybdenum salt, a conductive salt and a complexing agent in water to obtain a NiMo electro-deposition solution; the method comprises the following steps: dissolving cobalt salt and a ligand in a mixed solution of DMF and water to obtain a Co MOF electro-deposition solution; the pretreated nickel net is placed in a NiMo electro-deposition solution for constant-current deposition, and a NiMo electrode with a NiMo deposition layer loaded on the nickel net is obtained; the NiMo electrode is placed in the Co MOF electro-deposition solution for constant-voltage deposition, and the NiMo-Co MOF composite electrode with the Co MOF deposition layer loaded on the NiMo electrode is obtained. The method is simple and easy to control, low in preparation cost and good in electrode stability and hydrogen production effect.

The invention discloses a carbon-coated nickel-based super-hydrophobic catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts and high alcohol synthesis. The preparation method comprises the following steps: dissolving nickel salt and citric acid in water, and then heating and stirring the obtained mixed solution to obtain a precursor; roasting the precursor in an inert atmosphere to obtain a carbon-coated nickel-based catalyst; and carrying out ball-milling mixing on the carbon-coated nickel-based catalyst and polytetrafluoroethylene to obtain the carbon-coated nickel-based super-hydrophobic catalyst. According to the invention, the carbon-coated nickel-based catalyst is firstly prepared, then the carbon-coated nickel-based catalyst is coupled with the hydrophobic polymer polytetrafluoroethylene to form a new super-hydrophobic catalyst, and the nickel-based catalyst and the polytetrafluoroethylene are subjected to ball-milling mixing, so that the hydrophobic property of the nickel-based catalyst is improved, the water poisoning phenomenon of the catalyst is relieved, and further coupling of low-carbon alcohol to higher alcohol is promoted; the yield of the high alcohol and the selectivity of the C6 < + > high alcohol are improved, and the method has a wide application prospect.

The invention discloses a self-supporting catalytic electrode for hydrogen production from alkaline electrolyzed water and a preparation method of the self-supporting catalytic electrode. The preparation method comprises the steps that an electroplating solution containing nickel salt, ferric salt and ammonium chloride is prepared, then in the electroplating solution, a conductive substrate serves as a cathode, metal nickel serves as an anode, an external power source is used for providing gradually-increased electroplating voltage, and electroplating is carried out in three stages; depositing a nickel-iron alloy conducting layer on the cathode in an electroplating voltage range of 0.5-1.0 V; the electroplating voltage is gradually increased to 1.0-1.4 V, and a transition layer in which the ferro-nickel alloy and LDH coexist continues to be deposited on the cathode; and the electroplating voltage is further increased to 1.4-1.8 V, and the LDH active layer continues to be deposited on the cathode. The conductive supporting layer and the high-activity catalytic layer are continuously deposited on the same substrate through the electroplating technology, integrated combination of conductivity and catalytic performance is achieved, and the defects that in a traditional catalytic electrode, the binding force between an active layer and a supporting body is weak, and stability is poor are overcome.

The invention provides a CuCoNi-MOF aerogel nano-enzyme, a preparation method thereof and a detection reagent, and belongs to the technical field of antibody detection.The preparation method of the aerogel nano-enzyme comprises the following steps that bivalent copper salt, bivalent cobalt salt and bivalent nickel salt are mixed, then a reducing agent is added to reduce bivalent metal ions, then a dimethylimidazole solution is added, and the CuCoNi-MOF aerogel nano-enzyme is obtained. And reacting at 25-35 DEG C for at least 1 hour, finally taking out the precipitate after the reaction, washing with deionized water, and freeze-drying to obtain the target product. The detection reagent provided by the invention is prepared from the aerogel nano-enzyme as a raw material. The aerogel nano enzyme has high activity and strong stability, and can form a detection reagent with stable properties with a protein biomarker, and meanwhile, the preparation method is simple and convenient, and does not need expensive instruments, so that the manufacturing cost can be reduced. The detection reagent provided by the invention has very high sensitivity and accuracy.

The preparation method comprises the following steps: placing Al2O3 particles in an alkaline solution for pretreatment, mixing the pretreated Al2O3 particles with a precursor solution containing an iron salt, a manganese salt, a nickel salt and a carbon source, stirring, standing, filtering, drying to obtain precursor-loaded Al2O3 particles, and calcining the precursor-loaded Al2O3 particles to obtain the catalyst. And washing and drying to obtain the supported catalyst. The supported catalyst prepared by the invention has the advantages of strong catalytic activity, high catalytic efficiency, stable structure and the like, is a core-multi-shell structure catalyst with excellent performance, and can realize efficient degradation and removal of organic pollutants in a short time when being used for catalyzing ozonation and treating organic polluted wastewater; good economic benefits and application prospects are realized. The preparation method has the advantages of simplicity and convenience in operation, simple process, low cost, greenness, no pollution and the like, is suitable for large-scale preparation and is beneficial to industrial application.

The invention relates to an environment-friendly inorganic pigment and a preparation process thereof, and relates to the technical field of inorganic pigments, the environment-friendly inorganic pigment is prepared from the following raw materials by weight: 40-50 parts of a metal oxide, 5-8 parts of a dopant, 3-5 parts of a fluxing agent, 4-6 parts of a filler, and 0.5-0.8 part of a surface modifier; the metal oxide is formed by mixing CoAl2O4 and Fe2TiO5 according to the mass ratio of (3 to 5): 1; the dopant is prepared from rare earth salt, manganese salt, nickel salt, niobium salt, strontium salt and zircon salt. The environment-friendly inorganic pigment is low in preparation energy consumption, environment-friendly, excellent in covering power, weather resistance and light resistance.

The invention belongs to the technical field of hydrometallurgy, and particularly relates to a method for separating nickel and cobalt from a nickel-containing solution and preparing nickel salt, which comprises the following steps: 1) chelating and precipitating impurity metal ions in the nickel-containing solution by using ammonium polyphosphate with the polymerization degree of more than 1000 as an impurity removal agent, thereby removing copper, iron, zinc and aluminum to obtain an impurity-removed solution; 2) extracting the impurity-removed solution by using a diluent, alpha-hydroxyoxime, carboxylic acid and alkyl alcohol as an extraction organic phase to obtain a nickel-loaded organic phase; 3) washing the nickel-loaded organic phase by using nickel-containing washing water; and (4) reverse extraction is conducted on the washed nickel-loaded organic phase through reverse extraction liquid containing acid and nickel ions, nickel-rich liquid is obtained after reverse extraction is completed, nickel salt in the nickel-rich liquid is crystallized, and nickel salt solids are obtained after phase separation. According to the method, nickel is selectively extracted through the compound extraction system after impurity removal, the extraction rate of nickel reaches up to 99.8%, nickel is separated from metal ions such as cobalt and lithium, and the method is simple in process, low in equipment manufacturing cost and low in manufacturing cost.

The invention discloses a preparation method and application of a carbon dioxide hydrogenation catalyst, and belongs to the field of hydrogenation catalysis. The vanadium slag is used as a raw material, a leaching solution containing silicon, chromium and vanadium is obtained through sodium salt roasting, an aluminum source is added to remove the silicon element, meanwhile, an ordered mesoporous carbon material is added, and silicon and aluminum elements are converted into an ordered mesoporous composite oxide which is used as a hydrogenation catalyst carrier; an indium salt, a cerium salt and a nickel salt are dissolved in ethanol and mixed with the carrier for isopyknic impregnation to obtain the hydrogenation catalyst; and carrying out chromium and vanadium separation on the silicon-removed leaching solution to obtain chromium sesquioxide and the all-vanadium redox flow battery electrolyte. The catalyst has a regular pore structure, ordered mesopores provide a confinement effect, dispersion and anchoring of active components are facilitated, and the activity of the catalyst is remarkably improved.

The invention belongs to the field of catalysts, and discloses a catalytic material based on lignin derivation and a preparation method and application thereof. The catalytic material is prepared from lignin derived carbon and NiFe LDH; the lignin derived carbon is inserted into the interlayer of the NiFe LDH and is coated on the surface of the NiFe LDH. The preparation method comprises the following steps: S1, dissolving a lignin derivative in water to obtain a first solution; s2, dissolving metal salt in water to obtain a second solution, wherein the metal salt comprises ferric salt and nickel salt; s3, mixing the first solution and the second solution, and adjusting the pH value to obtain a mixed solution; and S4, immersing the conductive current collector into the mixed solution for hydrothermal reaction, taking out the conductive current collector after the reaction is finished, and treating the conductive current collector to obtain the catalytic material. The obtained catalytic material is used for an anode oxygen evolution reaction in an electrolytic seawater environment, and has high activity, high stability and good chlorine corrosion resistance.

The invention relates to a method for synthesizing 1, 4-butanediamine and co-producing NMP (N-Methyl Pyrrolidone), which comprises the following steps: dissolving 1, 4-butanedinitrile in a solvent, and reacting with introduced hydrogen and carbon dioxide under the action of a bi-component composite catalyst to obtain a product containing 1, 4-butanediamine, carrying out separation and purification treatment on the obtained product containing 1, 4-butanediamine to obtain 1, 4-butanediamine and NMP (N-Methyl Pyrrolidone); the active components of the bi-component composite catalyst comprise nickel salt and copper salt. According to the method disclosed by the invention, the carbon dioxide carbon source is introduced, so that the conversion of the byproduct butyrolactam into the NMP product with a high added value is realized, the combined yield of the 1, 4-butanediamine and the NMP and the conversion rate of the 1, 4-butanedinitrile are relatively high, and the economic benefit is remarkably improved.

The invention is suitable for the technical field of water electrolysis hydrogen production, and provides an alkyne-rich carbon-ruthenium nickel alloy catalyst and a preparation method and application thereof. The preparation method comprises the following steps: simultaneously adding a ruthenium salt solution, a nickel salt solution and an organic molecule solution into an alkyne-enriched carbon dispersion liquid for reaction; and carrying out centrifugation, cleaning and vacuum drying treatment on the reacted mixed solution to obtain the alkyne-rich carbon-ruthenium nickel alloy catalyst. According to the invention, the acetylene-rich carbon-ruthenium nickel alloy catalyst uniformly loaded with ruthenium nickel (RuNi) clusters is successfully prepared. In the performance evaluation of hydrogen production by water electrolysis in a simulated seawater environment, the material shows excellent hydrogen evolution activity as a cathode catalyst. Experimental results show that under the applied potential of-0.6 V (relative to a reversible hydrogen electrode, RHE), the absolute value of the current density can reach 0.847 A cm <-2 > to 0.896 A cm <-2 >. The invention provides a feasible material solution for developing a high-performance water electrolysis hydrogen production catalyst suitable for a complex water quality environment.