114 results about "Nickel hydroxide (II)" patented technology

The invention discloses a nickel-containing etching wastewater treatment process, which belongs to the technical field of environmental protection, and comprises a raw water regulating tank, a pH pre-regulating tank, a heterogeneous catalytic oxidation tower, a neutralization coagulation tank, an inclined tube sedimentation tank and a clean water tank which are connected in sequence. According to the process, under the neutral condition, a catalyst loaded with cobalt manganese oxide is used for activating sodium hydrogen persulfate, high-activity sulfate free radicals are generated, a Ni-EDTA complex structure is fractured in a targeted mode, free nickel ions are released in situ, organic ligands are synchronously mineralized, and the adding amount of sodium hydrogen persulfate is dynamically adjusted through a clean water pool closed-loop control system; and high-purity nickel hydroxide precipitate is generated through alkaline precipitation and coagulation, so that efficient solid-liquid separation is realized. The treatment process disclosed by the invention is compact in flow and stable in operation, effectively solves the problems of difficult complex breaking, low nickel removal efficiency, high sludge toxicity, difficult resource recovery and the like when the EDTA complex nickel wastewater is treated by a traditional method, realizes closed-loop recovery of nickel resources, and has the remarkable advantages of low cost, high efficiency and environmental friendliness.

The application discloses a composite precipitant for wet refining of laterite nickel ore and a wet refining method of laterite nickel ore. The composite precipitant for wet refining of laterite nickel ore is composed of a mixture of magnesium oxide and sodium hydroxide, and the mass fraction of sodium hydroxide in the composite precipitant is greater than 0 and less than or equal to 99%. The wet refining method of laterite nickel ore comprises the following steps: directly or after being grinded, the composite precipitant is added into an acidic solution to be refined, and stirring is performed to make the composite precipitant fully react with the acidic solution to be refined; after concentration, a clear liquid and a solid-containing slurry are obtained; the solid-containing slurry is filtered and washed with water to obtain a solid containing nickel hydroxide, cobalt hydroxide or nickel hydroxide-cobalt hydroxide, so that nickel, cobalt or nickel-cobalt is precipitated. The composite precipitant and the wet refining method of laterite nickel ore have the advantages of simple process, low cost, easy process control, easy settlement and filtration of nickel hydroxide (and cobalt hydroxide) precipitation, and the production efficiency can be significantly improved and the energy consumption can be reduced.

The invention discloses a method for preparing a sulfur-doped nickel hydroxide-based self-supporting electrolyzed water anode, and belongs to the technical field of preparation of electrolyzed water catalytic electrodes, and the method comprises the following steps: S1, preparing strong oxidizing salt, thiourea and transition metal salt into an active solution; s2, pretreating the nickel-containing metal substrate to obtain a precursor; and S3, immersing the precursor in an active solution for ultrasonic impregnation, and performing in-situ oxidation to prepare the sulfur-doped nickel hydroxide-based self-supporting electrolytic water anode. According to the method for preparing the sulfur-doped nickel hydroxide-based self-supporting electrolytic water anode, an oxidizing agent-thiourea-transition metal salt synergistic reaction system is adopted, an ultrasonic-assisted technology is combined, and a high-performance catalytic layer is directly grown on the surface of the metal substrate in situ at room temperature; the invention aims to synchronously realize high catalytic activity, excellent stability and macro preparation of the electrode and fundamentally solve the core pain points of long process, high energy consumption, difficulty in amplification and the like in the prior art.

The invention provides a gas sensor and a method for preparing the gas sensor through laser direct writing. The method comprises the following steps: enabling a metal electrode to be in contact with laser direct writing ink, wherein the laser direct writing ink comprises a nickel source, a porous structure guiding agent and a solvent; laser irradiates a specified contact area of the metal electrode and the laser direct-writing ink, so that the metal electrode absorbs the laser to generate heat so as to form a hydrothermal reaction area in the specified contact area, and the laser direct-writing ink in the hydrothermal reaction area is subjected to a hydrothermal reaction, so that porous nickel hydroxide grows on the metal electrode, and a precursor structure is obtained; and carrying out annealing treatment on the precursor structure so as to convert the porous nickel hydroxide into porous nickel oxide, thereby obtaining the gas sensor. The gas sensor provided by the invention has the porous nickel oxide which has a relatively large specific surface area, so that the effective contact area between the gas sensor and target gas can be increased, and the gas responsivity of the gas sensor is improved.

The invention belongs to the field of PET (polyethylene glycol terephthalate) plastic waste treatment, and particularly relates to preparation of a copper oxide-nickel hydroxide core-shell structure catalytic material and application of the copper oxide-nickel hydroxide core-shell structure catalytic material to preparation of high-added-value formic acid by upgrading electro-catalysis PET plastics, and the preparation method comprises the following steps: (1) placing a copper conductive substrate in an alkali etching mixed solution for alkali etching treatment, obtaining a conductive substrate on which a Cu (OH) 2 precursor grows; (2) placing the conductive substrate on which the Cu (OH) 2 precursor grows in a muffle furnace for heat treatment to obtain a conductive substrate on which CuO nanowires grow; and (3) placing the conductive substrate on which the CuO nanowire grows in a hydrothermal kettle, and obtaining the CuO-coated Ni (OH) 2-x core-shell structure catalyst through a hydrothermal method.

The application provides a method for efficiently and selectively removing iron and chromium from cobalt-nickel hydroxide raw materials, which can realize the synchronous and deep removal of iron and chromium impurities for high-iron and high-cobalt nickel hydroxide raw materials through the synergistic process of acid leaching, reduction pH adjustment, oxidation precipitation and solid-liquid separation, and the concentrations of iron and chromium in the purified nickel-cobalt liquid are both controlled below 10 mg / L, and the impurity removal precision meets the subsequent high-purity production requirements; the chromium-goethite co-precipitation crystal product is generated in situ in the reaction, and has excellent settling and filtering performance, solving the problems of difficult colloid precipitation and filtration and easy equipment blockage in the traditional method, and the process route is short and the reaction conditions are mild, which can effectively reduce the adsorption entrainment and co-precipitation loss of nickel and cobalt valuable metals, and while realizing the efficient and deep purification of iron and chromium, the excellent solid-liquid separation performance and high main metal recovery rate are also considered, and the method is suitable for the industrial purification treatment of high-iron and high-chromium complex cobalt-nickel raw materials.

The application discloses a preparation method of a nickel-doped and high-hydrated cobalt-chromium-iron ore monocrystal under high temperature and high pressure, and the method comprises the following steps: preparing a cylindrical cobalt-chromium-iron ore sample by taking solid basic cobalt carbonate powder, solid chromium (III) acetate hydroxide crystal powder, solid nickel stearate, solid oxalic acid powder, solid chromium hydroxide powder, solid nickel hydroxide powder and liquid dilute nitric acid as starting raw materials; preparing water source sheets by taking chromium hydroxide powder and nickel hydroxide powder in a weight ratio of 4:1; placing two water source sheets at two ends of the cylindrical cobalt-chromium-iron ore sample respectively and then putting them into a double-capsule structure sample bin; and obtaining a cobalt-chromium-iron ore monocrystal after high-temperature and high-pressure reaction, so that the blank of the preparation technology of the nickel-doped and high-hydrated cobalt-chromium-iron ore large-grain monocrystal under the current high-temperature and high-pressure condition is solved, and the experimental sample of the nickel-doped and high-hydrated cobalt-chromium-iron ore large-grain monocrystal is obtained.

This application provides a method and system for extracting scandium from a scandium-containing cobalt-nickel hydroxide solution, belonging to the field of heavy metal recovery technology. The method includes the following steps: extracting the scandium-containing cobalt-nickel hydroxide solution with an organic extractant to obtain a scandium-containing organic phase; washing the scandium-containing organic phase to obtain a purified organic phase; back-extracting the purified organic phase with hydrochloric acid to obtain a scandium-containing back-extract and a back-extracted organic phase; performing scandium extraction treatment on the scandium-containing back-extract to obtain scandium oxide; and regenerating the back-extracted organic phase sequentially with sodium carbonate and dilute sulfuric acid to obtain a regenerated organic extractant, which is then reused. This application first sequentially washes the chlorine with sodium carbonate and sulfuric acid solutions, solving the emulsification problem in the extraction, washing, and back-extraction stages caused by washing with sodium carbonate solution. Furthermore, compared to directly using sulfuric acid solution for washing, this application uses less sulfuric acid in the regeneration stage, preventing phase miscibility during the washing process.

This invention provides a method for removing impurities and recovering nickel anolyte from electrolytic nickel. The method includes the following steps: (1) mixing the electrolytic nickel anolyte with liquid alkali, separating the solid and liquid components to obtain nickel hydroxide and filtrate, evaporating the filtrate to obtain sodium sulfate; mixing the electrolytic nickel anolyte with a nickel source to obtain a mixed solution; (2) mixing the mixed solution with barium salt for lead removal; (3) adjusting the pH of the material obtained after lead removal with nickel hydroxide to obtain an arsenic removal solution, mixing the arsenic removal solution with polyferric sulfate for arsenic removal; (4) mixing the material obtained after arsenic removal with an oxidant to obtain an iron removal solution, performing solid-liquid separation on the iron removal solution to obtain lead-, arsenic-, and iron-removed cathode liquid and iron-containing slag, adding sodium sulfate to the lead-, arsenic-, and iron-removed cathode liquid, and reusing it in the electrolytic nickel process. The method of this invention can efficiently and quickly remove lead, arsenic, and iron from electrolytic nickel anolyte and reuse it.

The invention provides a method for preparing nickel hydroxide from laterite-nickel ore, which comprises the following steps: after the laterite-nickel ore is pulped, carrying out iron and aluminum removal treatment to obtain iron and aluminum removed liquid; carrying out resin adsorption treatment on the iron and aluminum removed liquid to obtain nickel adsorbed resin; desorbing the nickel-adsorbed resin to obtain a nickel-rich solution, and sequentially carrying out copper and zinc removal, calcium and magnesium removal, fluorine removal treatment and silicon removal treatment to obtain a nickel salt solution; the nickel salt solution, the liquid caustic soda and the dispersing agent solution are injected into the base solution in a parallel flow mode, nickel hydroxide slurry is obtained through a co-precipitation reaction, and nickel hydroxide is obtained through post-treatment. According to the method, after the laterite-nickel ore is pulped to remove iron and aluminum, nickel is extracted through high selectivity of resin, nickel, manganese and cobalt can be separated and analyzed to obtain nickel-rich solutions, a purified nickel salt solution is obtained through series impurity removal, the purified nickel salt solution reacts with liquid caustic soda, and a high-purity nickel hydroxide product is prepared. And the nickel does not need to be recovered through a complex extraction process.

A positive electrode active material having both higher capacity and safety is provided. Provided is a method for manufacturing a positive electrode active material, including forming a mixed solution containing a cobalt compound and a nickel compound dissolved; making the mixed solution react with an alkaline aqueous solution to obtain a suspension in which a cobalt nickel hydroxide is precipitated; performing first suction filtration of the suspension with use of water; and after the first suction filtration, performing second suction filtration with use of an organic solvent. In the cobalt nickel hydroxide, an atomic ratio of nickel in the sum of an atomic ratio of cobalt and the atomic ratio of nickel is greater than 0 and less than or equal to 0.01.

The invention provides a method for preparing nickel sulfate by using MHP to callback and remove impurities, which comprises the following steps: S1, slurrying: adding water into MHP, stirring and slurrying to obtain cobalt nickel hydroxide slurry; s2, acid leaching: adding sulfuric acid into the cobalt nickel hydroxide slurry to adjust the pH value to 1.0-1.5, and carrying out acid leaching to obtain a pre-callback solution; s3, first-stage callback: preparing a first MHP slurry, adding the first MHP slurry into the pre-callback liquid, callback the pH to 3.0-3.5, and carrying out a stirring reaction to obtain a first-stage callback slurry; s4, second-stage callback: preparing second MHP slurry, adding the second MHP slurry into the first-stage callback slurry, callback the pH to 5.0-5.2, and stirring for reaction to obtain second-stage callback slurry; and S5, carrying out solid-liquid separation on the second-stage callback slurry to obtain a nickel sulfate solution and solid residues. According to the method, the MHP callback impurity removal is adopted, an original lime milk callback process is replaced, the concentration of nickel sulfate is increased, and the calcium bonding risk of a conveying pipeline is reduced.

The invention provides a nickel hydroxide material and a preparation method thereof, and relates to the technical field of nickel-metal hydride batteries. The nickel hydroxide material is of a spherical composite structure and sequentially comprises a multi-element doped nickel hydroxide matrix, a hydroxyl cobalt oxide middle layer and an outer lithium modification layer which are arranged from inside to outside, at least one of a zinc element, an aluminum element and a magnesium element is doped in the nickel hydroxide matrix. According to the nickel hydroxide material, through a unique spherical composite structure and a specific element doping strategy, the electrochemical performance and the structural stability of the material are remarkably improved, and the nickel hydroxide material has a wide application prospect in high-performance battery application.

This invention belongs to the field of secondary utilization technology of metal resources, specifically relating to a method for treating waste liquid from electroplating zinc-nickel alloys. The method includes the following steps: S1, mixing the waste liquid from electroplating zinc-nickel alloys, oxygen, and a catalyst, and performing an oxidation reaction to obtain an intermediate liquid and nitrogen; the oxidation reaction temperature is ≥220℃; S2, adjusting the pH of the intermediate liquid to 13.0-13.5, performing a first filtration separation to obtain nickel hydroxide sludge and filtrate 1; S3, adjusting the pH of filtrate 1, performing a second filtration separation to obtain zinc hydroxide sludge and filtrate 2. This invention first degrades COD to obtain zinc and nickel ions; adjusting a specific pH value generates nickel hydroxide sludge, with zinc ions existing in the system as polyhydroxy zinc anions, achieving separation of nickel and zinc; further adjusting the pH separates zinc from the system as zinc hydroxide sludge precipitate. The operation is simple, with high separation efficiency and high purity.

The application provides an electrochemical deposition preparation method and application of a nickel oxide film. A nickel hydroxide film is prepared on a transparent conductive glass substrate through pulse current electrochemical deposition, and is converted into a nickel oxide film with a vertical nanosheet network structure after heat treatment. The application allows ions to be supplemented at an electrode / solution interface by controlling the periodic on-off cycle during electrodeposition, and reduces the thickness of a diffusion layer. Decoupling of the deposition relaxation allows the system to nucleate and grow in a well-controlled manner. The finally obtained nickel oxide film can form a unique heterojunction interface with other materials, produce a vertical carrier transport channel, and has enhanced interface adhesion and excellent carrier extraction capability. After being prepared into a solar cell, the device can still maintain more than 95% of the initial efficiency after running at the maximum power point for 2130 hours in a stability test under simulated AM 1.5G irradiation at 85°C.

The invention discloses a method for constructing a high-performance alpha-phase nickel hydroxide positive electrode plate, and aims to solve the problem that the electrochemical performance cannot be exerted in a total battery due to poor intrinsic conductivity of traditional alpha-phase nickel hydroxide. According to the method, multiple conductive components are introduced in the preparation process of an alpha-phase nickel hydroxide positive electrode to construct a composite conductive network, and the conductive network comprises cobalt-coated beta-phase nickel hydroxide, cobalt-doped alpha-phase nickel hydroxide, cobalt-coated alpha-phase nickel hydroxide, carbon black and the like. Through effective compounding of the material and alpha-phase nickel hydroxide, the electron transmission capability and the structural stability of the alpha-phase nickel hydroxide positive electrode are remarkably improved. After the prepared positive electrode plate is assembled into a nickel-metal hydride battery or a zinc-nickel battery, a performance test is carried out, and a result shows that the nickel-metal hydride battery or the zinc-nickel battery has higher discharge capacity and more excellent cycle life. The method disclosed by the invention is simple in process, high in operability and suitable for development and application of the positive electrode plate of the high-performance alkaline secondary battery, and has a good industrialization prospect.

The present disclosure relates to a halogen-doped nickel-cobalt-lithium aluminate, a preparation method and application thereof, the method comprising the following steps: S1, mixing nickel hydroxide with an aluminum source in a first solid phase to obtain a first solid material; S2, mixing the first solid material with a cobalt source in a second solid phase, and performing a first heat treatment on the obtained mixture in a first oxygen-containing atmosphere to obtain a second solid material; S3, mixing the second solid material with a lithium source in a third solid phase, and performing a second heat treatment on the obtained mixture in a second oxygen-containing atmosphere; the cobalt source and / or the aluminum source contain halogen. The method has simple steps, is conducive to industrial scale-up implementation and batch production, and the prepared halogen-doped nickel-cobalt-lithium aluminate has relatively uniform mixing of elements; when used as a positive electrode material of a lithium ion battery, the halogen-doped nickel-cobalt-lithium aluminate has a high specific capacity and good cycle performance.

The invention belongs to the technical field of nickel-zinc batteries, and particularly relates to a regeneration method of a retired nickel-zinc battery positive electrode material and an obtained regenerated positive electrode material. The invention provides a method for leaching and directly regenerating an out-of-service nickel-zinc battery positive electrode material by using organic acid. The positive electrode material is leached by adopting the organic acid, a reducing agent is not used, and the organic acid is superior to inorganic acid in the aspects of safety and environmental protection. Stirring and hydrothermal reaction are combined in the regeneration process, so that regeneration preparation of the nickel hydroxide composite material is realized. The regeneration method is safe, simple, easy to implement and small in environmental harm.

This invention discloses a method for modifying lithium manganese iron phosphate (LFP) cathode materials coated with MoS2 / NiO / TiO2. The first step involves preparing a precursor, nickel hydroxide. Nickel nitrate, sodium hydroxide, ammonium molybdate, and thiourea are mixed and stirred uniformly, then reacted in a polytetrafluoroethylene (PTFE) hydrothermal reactor to obtain MoS2 and NiO solid particles. The second step involves mixing MoS2, NiO, and tetrabutyl titanate uniformly, then adding potassium chloride and allowing the mixture to stand to obtain MoS2 / NiO / TiO2 composite particles. Finally, these composite particles are mixed with LFP particles and stirred to obtain the MoS2 / NiO / TiO2 coated LFP cathode material. The modified LFP exhibits increased conductivity, significantly improved specific capacity, rate performance, and stability. Its initial charge-discharge specific capacity reaches 153.8–156.7 mAh / g, and its specific capacity at 2C rate reaches 132.4–140.0 mAh / g. The modification method used in this invention has a simple preparation process and is the first to achieve the goal of improving electrical performance by constructing a MoS2 / NiO / TiO2 composite material on the surface of lithium manganese iron phosphate.

The present invention provides a method for recovering nickel hydroxide and nickel sulfate from nickel-containing materials, wherein the nickel-containing materials are crushed and pulverized and then leached with sulfuric acid, leached residue separation and filtrate separation are performed and then the pH is adjusted to recover nickel hydroxide, and the recovered nickel hydroxide is further subjected to a sulfation reaction to recover nickel sulfate.

The application discloses a preparation method of a ruthenium oxide doped molybdenum oxide / nickel hydroxide full-pH electrolytic water catalyst, and belongs to the technical field of catalyst material preparation. The preparation method of the ruthenium oxide doped molybdenum oxide / nickel hydroxide comprises the following steps: firstly, mixing a molybdenum salt with a sodium dodecyl benzene sulfonate aqueous solution, and then placing the mixture into a foamed nickel base; subsequently, performing a hydrothermal reaction, and then performing a calcination treatment in a reducing atmosphere; finally, immersing the calcination product into a RuCl3 solution to obtain a self-supported heterojunction catalyst RuOx-MoO3 / Ni(OH)2. Through the composite structure design of the transition metal molybdenum / nickel base material and the noble metal ruthenium oxide cluster, the technical bottleneck of low activity and poor stability of the traditional ruthenium-based catalyst is effectively solved. The obtained catalyst exhibits excellent hydrogen evolution reaction (HER) activity and long-term stability in a wide pH range.

The invention provides a preparation method of a nickel phosphide catalyst applicable to preparation of adipic acid by electro-oxidation of cyclohexanone and an electrolysis device, and belongs to the technical field of new energy chemical engineering, and the preparation method specifically comprises the following steps: putting foamed nickel into a high-pressure reaction kettle containing a mixed solution of nickel nitrate, ammonium fluoride and urea, reacting at 100-120 DEG C for 8-12 hours, filtering, washing, and drying to obtain the nickel phosphide catalyst applicable to preparation of adipic acid by electro-oxidation of cyclohexanone. The obtained nickel hydroxide is placed at the downstream of a tubular furnace, the obtained sodium hypophosphite is placed at the upstream of the tubular furnace, heating is conducted for 2-4 hours at the temperature of 300-400 DEG C under the inert atmosphere, the nickel phosphide catalyst with high adipic acid selectivity in the cyclohexanone electrooxidation reaction is obtained, the nickel phosphide catalyst is especially suitable for large-current and long-time catalytic reaction, and the productivity and efficiency in unit time are greatly improved. Meanwhile, the problem that a high-performance catalyst is complex to prepare is solved, the synthesis condition is mild, the process is simple, the reproducibility is good, expensive raw materials or complex equipment is not needed, the production cost is remarkably reduced, and a solid foundation is laid for large-scale industrial application.

This invention provides an application of a 1,4-phenylenediol-modified titanium dioxide / nickel hydroxide heterojunction catalyst as a membrane coating material in lithium-sulfur batteries, belonging to the field of lithium-sulfur battery technology. The catalyst is constructed using a transition metal oxide heterojunction TiO2 / Ni(OH)2 as a substrate, modified by in-situ growth of the sulfur-containing organic compound 1,4-phenylenediol on its surface. This design, through the synergistic effect of the TiO2 / Ni(OH)2 heterojunction and the organic sulfur compound, significantly enhances the physicochemical adsorption and catalytic conversion efficiency of lithium polysulfides, thereby effectively suppressing the shuttle effect and improving battery cycle stability and reaction kinetics. This invention not only provides an efficient solution to the polysulfide shuttle problem but also offers a feasible path for the commercial application of lithium-sulfur batteries under high sulfur loading and low electrolyte conditions, which is of great significance for promoting the development of high-energy-density energy storage systems.

The invention discloses a method for efficiently refining a cobalt nickel hydroxide intermediate product, and relates to the technical field of hydrometallurgy, the method comprises the following steps: step S1, alkaline pressurized oxidation; s2, carrying out solid-liquid separation and washing; s3, normal-pressure acid leaching is conducted, specifically, the oxidized cobalt nickel hydroxide intermediate product in the step S2 is subjected to normal-pressure leaching with sulfuric acid, and finally solid-liquid separation is conducted to obtain Ni / Co-containing leaching liquid and Mn-containing leaching residues; s4, neutralization and impurity removal, wherein the oxidized cobalt nickel hydroxide intermediate product obtained in the step S2 is added into the leachate obtained in the step S3 to serve as a neutralizer and an oxidizing agent; and S5, SO2 is subjected to low-temperature pressurization reduction leaching. According to the method, the alkaline pressurized oxidation and normal-pressure acid leaching processes of the nickel-cobalt hydroxide intermediate product are adopted, a series of problems of long subsequent manganese separation process, large wastewater discharge and the like caused by synchronous leaching of nickel, cobalt and manganese in the leaching process of the nickel-cobalt hydroxide intermediate product are solved, and favorable conditions are created for simplifying the refining process of the nickel-cobalt hydroxide intermediate product and reducing the production cost.

The application provides a method for analyzing nickel in a zinc-nickel electroplating solution. The method comprises: performing standard coulometric titration on a sodium thiosulfate standard solution to calculate an actual molar concentration c 标准 ; adding an oxidizing agent solution and a sodium hydroxide solution to the zinc-nickel electroplating solution to obtain a high-nickel hydroxide precipitate, then adding a KI solution and sulfuric acid to obtain a sample solution; adding a second part of the sodium thiosulfate standard solution and a second part of a KI electrolyte to an electrolytic cup to perform sample coulometric titration and calculate the molar concentration c 镍 of nickel in the zinc-nickel electroplating solution. The application uses the change in the valence state of nickel hydroxide, combines a redox reaction with an indirect coulometric titration method, and obtains a cyanide-free coulometric titration method for quantitatively determining the content of nickel in a zinc-nickel electroplating solution. The method does not need to prepare a standard solution, indirectly determines nickel by using electrically generated iodine in a high-concentration zinc metal ion background, realizes high selectivity, high precision, and online determination of the content of nickel, and can significantly improve the detection efficiency.

The application provides a kind of nickel hydroxide and its preparation method, advanced oxidation reagent and application in water treatment, belong to catalytic technology field.The preparation method includes the following steps: S1, NaOH solution and nickel salt solution are mixed to obtain first mixed solution, then the pH of the first mixed solution is adjusted to 11-12, and the second mixed solution is obtained by standing treatment under room temperature condition;S2, the second mixed solution is activated at 50-60 DEG C, and the precipitate is separated;S3, the precipitate is washed and dried to obtain beta type nickel hydroxide.The nickel hydroxide obtained by the preparation method has excellent activation sodium percarbonate and / or sodium persulfate effect, and can improve its removal efficiency of organic pollutants.

The present application belongs to the technical field of nickel-zinc battery, and particularly relates to a regeneration method of positive electrode material of retired nickel-zinc battery and regenerated positive electrode material obtained by the method. The present application provides a method for leaching and directly regenerating the positive electrode material of the retired nickel-zinc battery by using organic acid. The positive electrode material is leached by using organic acid and without using reducing agent. The organic acid is superior to inorganic acid in safety and environmental protection. In the regeneration process, stirring and hydrothermal reaction are combined to realize the regeneration preparation of the nickel hydroxide composite material. The regeneration method is safe, simple and easy to operate, and has small environmental hazards.

The invention discloses a preparation method of a 2, 5-furandicarboxylic acid (FDCA)-based ligand modified nickel hydroxide catalyst (FDCA-Ni (OH) 2) and an application of the catalyst in the electrocatalytic oxidation of an FDCA precursor. The catalyst uses FDCA (target product) as a ligand to modify nickel hydroxide, and is used for electrocatalytic oxidation of FDCA precursors (including but not limited to 2, 5-dimethylolfuran, BHMF, 5-hydroxymethylfurfural, HMF, 5-hydroxymethyl-2-furancarboxylic acid, HMFCA, 2, 5-diformyl furan, DFF, 5-formyl-2-furancarboxylic acid, FFCA) into FDCA. The method is low in raw material cost, simple in process and mild in condition, and the prepared catalyst is excellent in performance, has remarkable economic value and is suitable for large-scale application of preparing FDCA through electro-catalytic oxidation of the FDCA precursor.

The invention provides a supported nickel-cobalt double-metal hydroxide catalyst as well as a preparation method and application thereof, and belongs to the technical field of electrocatalysts and electrochemical organic synthesis. The supported nickel-cobalt double-metal hydroxide catalyst comprises nickel species and cobalt species, the nickel species and the cobalt species are co-crystallized to form layered nanosheets, and the layered nanosheets grow on a porous carrier. The cobalt species are introduced into the nickel hydroxide catalyst, more electrochemical active sites are provided through a layered nanosheet structure formed by the cobalt species and the nickel hydroxide catalyst, when the cobalt species and the nickel hydroxide catalyst are subsequently applied to electro-catalysis preparation of adipic acid, electron transfer between adsorbed cyclohexanone and the catalyst is enhanced, and the conversion rate of the catalyst to cyclohexanone is increased.

The present application provides an electrolytic cell, an anode catalytic material, a preparation method therefor, and a use thereof. The anode catalytic material in the present application comprises: a substrate, which is an alloy comprising nickel and iron elements; and a nickel-rich oxide layer, which covers the surface of the substrate, wherein the nickel-rich oxide layer comprises nickel oxide and / or nickel hydroxide, and the mass content of nickel element in metal components of the nickel-rich oxide layer is greater than 70%. The anode catalytic material uses a nickel-iron alloy as a substrate, and the addition of iron element can effectively reduce the oxygen evolution overpotential of the substrate material; the nickel-rich oxide layer covering the surface of the substrate can passivate the substrate, and inhibit the dissolution of metal ions, preventing collapse of the skeleton structure of the alloy substrate, thereby maintaining mechanical stability; when the nickel-rich oxide layer is used as an anode, the thickness of the nickel-rich oxide layer does not increase significantly, thus not affecting the catalytic performance thereof; the nickel oxide and / or nickel hydroxide contained in the nickel-rich oxide layer and nickel iron hydroxide which may also be contained therein are also used as active components, thereby further ensuring the catalytic activity of the material.