44 results about "Cobalt sulfide" patented technology

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

The invention discloses a preparation method and application of a CuCo2S4 nanotube cluster / Zn3In2S6 nanosheet composite photocatalyst in the field of photocatalytic materials, the catalyst takes a cobalt sulfide copper nanotube cluster as a substrate, an indium zinc sulfide nanosheet layer is loaded on the surface, and a unique composite structure is formed. The preparation method comprises the following steps: preparing a CuCo nanotube cluster precursor through a hydrothermal method, and further preparing the CuCo2S4 nanotube cluster / Zn3In2S6 nanosheet composite photocatalyst through vulcanization and an oil bath method. The preparation method is simple, raw materials are easy to obtain, conditions are mild, control is easy, and the method is suitable for large-scale production. The prepared catalyst has high specific surface area and good dispersibility, also shows high carrier separation efficiency and strong light absorption performance, and can significantly improve the efficiency of photocatalytic decomposition of water to produce hydrogen and the efficiency of heavy metal removal under visible light.

The invention discloses a quaternary ferrocolumbium cobalt sulfide crystal, a preparation method and application, and belongs to the technical field of magnetic materials, the quaternary ferrocolumbium cobalt sulfide crystal has remarkable in-plane and out-of-plane magnetic anisotropy, and the chemical general formula of the quaternary ferrocolumbium cobalt sulfide crystal is Nb3 (Fe, Co) S6; the preparation method comprises the following steps: (1) preparing and packaging raw materials; (2) vacuum packaging; (3) carrying out CVT reaction; and (4) cooling and sampling. An improved double-temperature-zone chemical vapor transport (CVT) method is adopted, and a proper transport agent is selected, so that a multi-component raw material can be transported and recrystallized in a gaseous form at a relatively low temperature, and a single crystal with uniform components and a complete structure is obtained. The material can be applied to spintronics devices, high-density magnetic storage units and magnetic sensors; and a new platform is provided for researching complex magnetic interaction, magnetic anisotropy sources, potential superconductivity, topological properties and the like.

The present invention provides a method for comprehensively recovering lithium and cobalt from the cathode material of waste lithium cobalt oxide batteries, comprising the following steps: (1) Pretreating the cathode material of waste lithium cobalt oxide batteries to obtain lithium cobalt oxide cathode active material; mixing the lithium cobalt oxide cathode active material evenly with a sulfur-based compound and a carbon source to obtain a mixed material; subjecting the mixed material to roasting in an inert atmosphere, grinding, leaching, and filtering in sequence to obtain a lithium-containing solution and a sulfur-containing filter residue; (2) Subjecting the sulfur-containing filter residue to acid leaching for impurity removal and filtering to obtain cobalt sulfide slag; (3) Roasting the cobalt sulfide slag in an oxygen atmosphere to obtain a roasted product; (4) Subjecting the roasted product to leaching and filtering to obtain a cobalt sulfate solution and cobalt tetroxide. The method of the present invention can obtain soluble sulfates and high-purity cobalt oxides, and has a short process flow, low cost, and high lithium selectivity.

This invention relates to a biomass char composite electrocatalyst supported on nickel-cobalt sulfides, its preparation, and its application. The preparation method includes: subjecting biomass material to high-temperature carbonization to obtain a biomass char substrate with a porous structure; immersing the biomass char substrate in a solution containing nickel and cobalt salts, and obtaining biomass char supported on nickel-cobalt oxides through a hydrothermal reaction; placing the biomass char supported on nickel-cobalt oxides in a solution containing a sulfur source, and obtaining the biomass char composite electrocatalyst supported on nickel-cobalt sulfides through a hydrothermal reaction. The biomass char composite electrocatalyst supported on nickel-cobalt sulfides of this invention can be applied in biomass electrocatalytic oxidation reactions, achieving selective control of the biomass oxidation reaction and oxygen evolution reaction through an external magnetic field, thereby improving the efficiency of high-value conversion of biomass. The magnetic field control method of this invention has advantages such as non-contact control, simple system, and strong applicability, and has good application prospects.

The present invention belongs to the field of flotation, and particularly relates to a flotation method for low-grade copper-cobalt ore. The method comprises the following steps: grinding the raw copper-cobalt ore and then slurrying the raw ore to obtain raw ore slurry; then performing a sulfide ore roughing process to obtain a roughing concentrate a and a roughing tailing a; then performing a beneficiation treatment on the roughing concentrate a to obtain a copper-cobalt sulfide ore concentrate and a beneficiated middlings a; performing a scavenging treatment on the roughing tailing a to obtain a scavenging concentrate a and a copper-cobalt oxide ore scavenging tailing a; returning the beneficiated middlings a and the scavenging concentrate a to a first roughing process; performing a roughing treatment on the copper-cobalt oxide ore scavenging tailing a to obtain a roughing concentrate b and a roughing tailing b; performing beneficiation treatment on the roughing concentrate b to obtain a copper-cobalt oxide ore concentrate 1 and a beneficiated middlings b; performing a scavenging treatment on the roughing tailing b to obtain a scavenging concentrate b and a scavenging tailing b; and mixing the scavenging concentrate b and the beneficiated middlings b to perform a re-beneficiation treatment to obtain a copper-cobalt oxide ore concentrate 2. The present invention can improve the flotation recovery rate and selectivity of low-grade copper-cobalt ore by combining the process and the reagent.

The application provides a cobalt-nickel sulfide-indium oxide composite nanosheet material, a preparation method and application thereof. The preparation method of the cobalt-nickel sulfide-indium oxide composite nanosheet material comprises the following steps: synthesizing CoNi2S4 nanosheet powder; synthesizing In2O3 nanosheet powder; compounding the CoNi2S4 nanosheet and the In2O3 nanosheet: the CoNi2S4 nanosheet powder and the In2O3 nanosheet powder are fully dispersed in water according to a molar ratio of (1-2):(1:2), are placed in a light-transmitting container, are irradiated with visible light for 1 h, and then are centrifugally separated to obtain a precipitate, are washed with water, and are vacuum dried to obtain the cobalt-nickel sulfide-indium oxide composite nanosheet material. The cobalt-nickel sulfide-indium oxide composite nanosheet material prepared by the method can catalytically reduce carbon dioxide into carbon monoxide and methanol under visible light irradiation, the yield of methanol can reach 129.73 μg·g ‑1 ·h ‑1 , the selectivity and the electronic selectivity of methanol can reach 52.65% and 76.29%, respectively, and the methanol production performance does not show attenuation at least for 30 h.

The application discloses a cobalt sulfide / titanium carbide / carbon cloth composite anode material and a preparation method and application thereof. In order to solve the problems of the existing anode material, such as low efficiency of activating persulfate, limited electron transmission efficiency, difficulty in generating non-radicals, and complex preparation process of titanium carbide material and other materials, the application uses anhydrous ethanol and dimethylformamide as organic solvents, which can improve the solubility and dispersity of the titanium carbide material in the organic solvents and is beneficial to the generation of high-purity metal sulfide in a suitable proportion. Meanwhile, the application realizes the growth of the titanium carbide and the cobalt sulfide on the carbon cloth substrate by using a one-step solvothermal method under high temperature and high pressure, makes the cobalt sulfide grow on the surface and between the layers of the titanium carbide without changing the layered structure of the titanium carbide, and obtains the cobalt sulfide-titanium carbide-carbon cloth composite anode material, which is beneficial to the high-speed electron transmission on the electrode surface under the electric field and the generation of non-radicals. The application belongs to the technical field of electrocatalytic materials.

The invention discloses a method and a system for purifying a magnesium sulfate solution. The method comprises the following steps: pretreating a magnesium sulfate solution containing nickel and cobalt impurities to remove suspended matters and organic matters in the magnesium sulfate solution; adding sodium hydrosulfide into the pretreated magnesium sulfate solution, enabling nickel and cobalt to respectively react with the sodium hydrosulfide to generate precipitates, and carrying out solid-liquid separation to obtain the purified magnesium sulfate solution and precipitates containing nickel sulfide and cobalt sulfide; evaporating and crystallizing the purified magnesium sulfate solution to obtain magnesium sulfate crystals, and drying to obtain a magnesium sulfate product; and carrying out post-treatment on the precipitate containing the nickel sulfide and the cobalt sulfide, and recovering nickel and cobalt in the precipitate. The method can efficiently remove nickel and cobalt impurities in the magnesium sulfate solution, has the advantages of high efficiency, environmental protection, recoverable resources and the like, and can reduce the production cost and improve the resource utilization rate.

The invention belongs to the technical field of electro-catalytic materials, and relates to a preparation method and application of a CoFe-PBA chalcogenized carbon cloth composite material, in particular to a CoFe-PBA loaded carbon cloth Prussian blue (CoFe-PBA) precursor based on electrochemical activation. The invention discloses a method for preparing a cobalt sulfide / iron sulfide heterostructure material through sulfuration treatment and integrated application of the cobalt sulfide / iron sulfide heterostructure material in the field of hydrogen production through water electrolysis. Carbon cloth is activated through electrochemical pre-oxidation to enhance the surface activity, and after CoFe-PBA grows in situ, a uniformly dispersed CoS2 / FeS2 heterostructure is generated through calcination in a sulfur powder atmosphere. The material has high conductivity, abundant active sites and strong interface coupling effect, and shows excellent hydrogen evolution and oxygen evolution performance.

The invention relates to a preparation method of a cobalt sulfide CoSx / CC electrode, which comprises the following steps: 1) taking cobalt chloride and thiourea as raw materials, respectively dissolving the cobalt chloride and thiourea in deionized water at room temperature, and then mixing the two solutions to obtain a uniform CoSx solution; (2) transferring the solution and a piece of carbon cloth (1 * 6 cm) into a reaction kettle together, sealing, and putting into a drying oven to react for 6-20 hours at the constant temperature of 160-180 DEG C; and after the reaction kettle is naturally cooled to room temperature, taking out the carbon cloth, washing, and recording the obtained product as the CoSx / CC composite electrode. The CoSx / CC composite electrode material prepared by the invention has the advantages of low cost, regular crystal structure, excellent chemical stability, good cycling stability and the like. Compared with a traditional electrode material, the photocurrent density is remarkably improved, the conversion rate and selectivity of an electro-catalysis nitrate reduction synthesis ammonia reaction can be effectively improved, and wide application prospects are shown in the fields of advanced treatment of domestic sewage and industrial wastewater, green synthesis of ammonia resources and the like.

The invention provides a preparation method of a bismuth oxyiodide-cobalt sulfide in-situ heterojunction electrocatalytic carbon dioxide reduction catalyst, and belongs to the field of carbon dioxide electrocatalytic reduction. Urea and cobalt chloride hexahydrate are used as raw materials, a bismuth oxyiodide nanosheet is formed on a cobalt sulfide hollow nanotube through a two-step hydrothermal method in combination with a reaction of halide and bismuth nitrate, and the in-situ heterojunction electrode which has good selectivity on methanol and is used for electrocatalytic reduction of carbon dioxide is prepared. According to the method, a one-dimensional hollow nanotube structure is prepared by adopting a two-step thermal solvent method, and then bismuth oxyiodide nanosheets grow on the one-dimensional hollow nanotube structure in situ. The method is easy and convenient to operate, meanwhile, a compact heterojunction interface can be formed between the bismuth oxyiodide hollow nanotube and the cobalt sulfide hollow nanotube through in-situ growth, transfer of electrons of the composite material is promoted, the hollow nanotube structure is also beneficial to gas adsorption of the catalyst, and therefore the electro-catalytic performance is greatly improved. The preparation method provides a new thought and method for improving the selectivity and stability of electrocatalytic carbon dioxide reduction.

The present invention provides a zinc-cobalt sulfide bimetallic organic framework material, a preparation method thereof, and an application in the electrochemical detection of glucose, belonging to the technical field of glucose detection. In the present invention, Zn itself has a certain electrochemical catalytic effect, but due to the limited active sites and insufficient orbits in the Zn organic framework material, it has limitations in the application of electrochemical detection. The present invention uses Zn and Co as the double coordination metals of the organic framework material. The addition of Co can replace the position of the original Zn, so that Zn is more exposed on the surface of the organic framework material, thereby improving the catalytic activity. Through the sulfurization reaction, the zinc-cobalt bimetallic organic framework material of the present invention forms a hollow structure during the sulfurization process, has a larger specific surface area, can provide more catalytic active sites, and the electronegativity of S is lower, which can reduce the collapse of the organic framework material structure and maintain the stability of the material structure.

A method for preparing a cobalt sulfide / reduced graphite oxide composite includes: preparing a glycerol-cobalt precursor by taking a water-soluble cobalt salt, a micromolecular alcohol solvent, and glycerol as raw materials; mixing the glycerol-cobalt precursor with an alkali liquor to prepare a Co(OH)2 nanoflower; calcining the Co(OH)2 nanoflower to obtain a Co3O4 nanoflower; subjecting the Co3O4 nanoflower to a reaction with a water-soluble sulfur salt to obtain a COS nanoflower, and mixing the COS nanoflower with graphite oxide and carrying out a heat treatment to obtain the composite. The response characteristics of a gas sensor to NO2 gas are studied at room temperature, and the graphite is complexed with a transition metal sulfide with unique morphology to construct a unique heterostructure. While expanding the specific surface area to increase the number of adsorption sites, the heterostructure of a contact surface is used to greatly enhance the charge-transfer efficiency.

The invention discloses a flaky nickel-cobalt sulfide array / multilayer graphene composite material, a preparation method and a supercapacitor. Nickel-cobalt sulfide prepared on the surface of multilayer graphene is flaky and is uniformly distributed on the surface of the multilayer graphene in an array manner. The nickel-cobalt sulfide sheet is composed of multiple phase structures (NiS, Ni3S2 and Co3S4) of nickel and cobalt, and the formed heterojunction structure enables the activity of Ni and Co ions to be enhanced. The nickel-cobalt sulfide sheets are uniformly distributed on the surface of the multilayer graphene, so that the electron transfer speed between the nickel-cobalt sulfide and the multilayer graphene is increased. Nickel-cobalt sulfide sheets grow upwards on the surface of the multi-layer graphene, and gaps are formed between the sheets, so that the contact area between the electrolyte and the nickel-cobalt sulfide is increased, and the active sites of Ni and Co are increased. The composite material obtained by adopting the technical scheme of the invention has excellent supercapacitor performance.

The invention belongs to the technical field of catalysts, and provides a sulfur recovery tail gas hydrogenation catalyst and a preparation method thereof, the catalyst comprises a carrier and an active component loaded on the carrier; the active components are molybdenum sulfide, cobalt sulfide and nickel sulfide; the carrier is prepared by mixing and molding aluminum-titanium composite hydroxide, magnesium oxide, a pore-enlarging agent and a binder and then roasting, and the aluminum-titanium composite hydroxide is prepared by adopting a rapid coprecipitation-secondary crystallization method; based on the total weight of the catalyst, the content of the molybdenum sulfide is 5 to 20 wt%, the content of the cobalt sulfide is 1 to 5 wt%, the content of the nickel sulfide is 0.5 to 5 wt%, the content of the aluminum-titanium composite metal oxide is 75 to 90 wt%, and the content of the magnesium oxide is 1 to 10 wt%. The catalyst provided by the invention has the characteristics of high SO2 hydrogenation activity and strong organic sulfur hydrolysis ability, and has good activity stability.

The present invention discloses a cobalt niobium sulfide / niobium carbide composite microwave absorbing material, its preparation method and application, belonging to the technical field of microwave signal shielding materials. In the cobalt niobium sulfide / niobium carbide composite microwave absorbing material of the present invention, cobalt niobium sulfide is used as a load and attached to the interlayers and surfaces of accordion-shaped multi-layer Nb2C serving as a carrier, forming a surface-modified stable multi-layer and multi-porous material structure, which has high conductivity and chemical stability. Moreover, the preparation method is simple and effective, with few process steps, high repeatability and high product purity. The microwave signal shielding coating slurry prepared with the cobalt niobium sulfide / niobium carbide composite microwave absorbing material as the main material, dimethyl sulfoxide and hydroxyethyl cellulose as co-solvents and thickeners has the advantages of good chemical stability, high electromagnetic shielding efficiency and wide application scenarios.

This invention belongs to the field of nanomaterial preparation and application technology, and discloses a phosphorus-doped nickel-cobalt sulfide nanotube catalyst, its preparation method, and its application. The method includes: using metallic nickel salt, cobalt salt, and urea as raw materials, and water as a solvent, preparing a nickel-cobalt hydroxide nanorod precursor via hydrothermal reaction; then synthesizing nickel-cobalt sulfide nanotubes via hydrothermal reaction; and finally obtaining a phosphorus-doped nickel-cobalt sulfide nanotube catalyst with a hollow structure via phosphating. Phosphorus doping effectively optimizes the electronic structure of nickel-cobalt sulfides, improving catalytic performance. The prepared catalyst exhibits excellent catalytic activity in hydrogen evolution and sulfur oxidation reactions. In a two-electrode sulfur ion oxidation coupled hydrogen production electrolyzer, a voltage output of 0.373 V is required to produce 10 mA cm⁻¹. ‑2 The invention achieves the goals of energy-saving hydrogen production and high-value-added elemental sulfur by utilizing a specific current density. Furthermore, the preparation method is simple, the conditions are easily controlled, and the raw materials are low-cost and environmentally friendly, making it widely applicable in fields such as water electrolysis for hydrogen production and sulfur oxidation reactions.

The invention belongs to the technical field of electrochemical materials and devices, and provides an MOF (Metal Organic Framework)-derived flower-like CuCo2S4 / NiCo2S4 heterostructure as well as a preparation method and an application of the MOF-derived flower-like CuCo2S4 / NiCo2S4 heterostructure. According to the method, firstly, a basic cobalt carbonate copper precursor is prepared through a solvothermal reaction, then the basic cobalt carbonate copper precursor reacts with 1, 3, 5-benzenetricarboxylic acid (H3BTC) to generate a CuCo-MOF precursor, and finally, the CuCo2S4 / NiCo2S4 composite material with the flower-like heterostructure is obtained through thioacetamide vulcanization treatment. The preparation process is controllable, batch production can be achieved, and reproducibility is good. The obtained composite material is excellent in stability, a hybrid supercapacitor assembled by the composite material shows ultrahigh specific capacity, excellent rate capability and cycling stability, the problems that a single transition metal sulfide is low in activity and insufficient in structural stability can be effectively solved, and the composite material is suitable for the field of high-performance electrochemical energy storage.

The application belongs to the technical field of composite electrode materials, and relates to a preparation method of a ternary CoS / NiCoAl-LDH / NGQDs heterostructure electrode material and application thereof. First, carbon cloth is immersed in a solution containing cobalt ions and 2-methyl imidazole, so that a cobalt-based metal organic framework (Co-MOF) array is grown in situ on the carbon cloth substrate. Then, through hydrothermal sulfidation treatment, the Co-MOF precursor is converted into hollow cobalt sulfide (CoS) nanotubes. Second, a nickel-cobalt-aluminum layered double hydroxide (NiCoAl-LDH) nanosheet is uniformly deposited on the surface of the CoS nanotube by electrodeposition, so as to form a hierarchical core-shell structure. Finally, nitrogen-doped graphene quantum dots (NGQDs) are anchored on the surface of the composite material through electrostatic adsorption, so as to complete the construction of the ternary heterostructure. The core advantage of the application lies in the directional construction of a synergistic interface, and each component solves different key problems: CoS provides a stable conductive network, NiCoAl-LDH endows multiple-electron redox reaction activity, and NGQDs improve the interface stability and charge injection efficiency.

The invention relates to the field of alloy production, and discloses a method for preparing an alloy from coarse pyrite. The method comprises the following steps: carrying out oxidizing roasting on coarse sulfur cobalt ore obtained in a flotation desulfurization process; the roasted pyrite is subjected to ore grinding; mixing the ground ore powder with a reducing agent, limestone and sodium humate to prepare lump ore; the lump ore is put into a rotary kiln to be roasted and reduced, and reduced iron slag is obtained; and the reduced iron slag is put into a submerged arc furnace to be smelted, and crude cobalt-nickel-iron alloy is obtained. According to the method disclosed by the invention, low-grade sulfur and cobalt resources which are difficult to economically treat by a traditional dressing and smelting method are efficiently recovered through oxidizing roasting desulfurization, reduction and submerged arc furnace melting separation treatment, cobalt and nickel elements which are dispersed in an occurrence state are effectively enriched, and iron elements in the resources are synchronously recovered; cooperative recovery of multiple metals such as cobalt, nickel and iron is achieved, and the total utilization rate of mineral resources is increased. The method is short in process, conventional in equipment, stable in operation and easy for large-scale and continuous industrial application.

The invention discloses a preparation method of tungsten-doped nickel / cobalt bimetallic sulfide (W-NiCo2S4), which is characterized in that nickel foam (Ni foam) is used as a carrier, and a W-doped CoNi2S4 nano structure is constructed by combining a hydrothermal method with subsequent sulfuration treatment. The introduction of W effectively regulates the electronic structure of the catalyst, enhances the conductivity and structural stability of the catalyst, and significantly improves the catalytic activity and sulfur poisoning resistance of the catalyst in electrocatalytic sulfide oxidation reaction (SOR). The prepared catalyst shows excellent electro-catalytic performance and long-term stability in alkaline electrolyte, the operability of the synthesis process is high, and the catalyst is suitable for the field of energy conversion such as hydrogen production through hydrogen sulfide decomposition and shows excellent industrial application prospects.

The application discloses a kind of Co x S y Preparation method and application of catalyst, belong to the technical field of catalyst preparation.The method is by using different solvents, the morphology of Co x S y Is controlled, to synthesize four kinds of Co x S y Catalyst with different morphology characteristics.The catalyst preparation method is simple, and the repeatability is strong.The obtained Co x S y Catalyst has high specific surface area, can expose more active sites, make reactant and catalyst active site contact fully, simultaneously, the catalyst has stronger sulfur resistance, and has abundant sulfur vacancy, is favorable to H2S and CO2 Adsorption and activation.Therefore, the obtained Co x S y Catalyst shows high catalytic activity in the reaction of H2S and CO2 hydrogenation.

To provide a method for recovering valuable metals by which the valuable metals composed of cobalt and nickel can efficiently and stably be recovered from a raw solution containing cobalt and nickel.SOLUTION: A method for recovering a valuable metal comprising at least one of cobalt and nickel from a raw solution containing at least one of cobalt and nickel, the method comprising: The method includes a sulfide generation step S01 of forming at least one of cobalt sulfide and nickel sulfide to obtain a sulfide-containing liquid, a solid-liquid separation step S02 of subjecting the sulfide-containing liquid to solid-liquid separation to obtain a sulfide-cake containing at least one of the cobalt sulfide and the nickel sulfide, and a sulfide dissolution step S04 of adding a mineral acid to the sulfide-cake to dissolve the sulfide-cake in a non-oxidizing atmosphere.SELECTED DRAWING: Figure 1

The tungsten-doped cobalt sulfide composite material provided by the invention takes Co3S4 as a matrix and is loaded with WS2; the single Co-based catalyst is mainly used for degrading pollutants by activating monopersulfate through Co < 2 + > to generate free radicals with strong oxidizing property and simultaneously generating Co < 3 + >, the Co < 3 + > can also react with monopersulfate to be converted into Co < 2 + >, but the conversion rate is relatively slow, which is a speed limiting step of the reaction; wS2 is doped into Co3S4, so that Co < 3 + > in a material matrix can be accelerated to be converted into Co < 2 + >, and Co < 3 + > can be accelerated to be converted into Co < 2 + > in a reaction process; further, the removal rate of the composite material for activating the monopersulfate to degrade the phenol is improved.

The invention relates to the technical field of electrode material preparation, in particular to a carbon nanosphere-coated manganese-doped nickel-cobalt sulfide / carbon cloth flexible electrode material and a preparation method and application thereof, nanoneedle-shaped manganese-doped nickel-cobalt sulfide grows on the surface of carbon cloth in situ, and the surface of each nanoneedle is coated with a carbon sphere layer. The preparation method comprises the following steps: firstly, growing a manganese-doped nickel-cobalt precursor with controllable morphology on carbon cloth in situ, coating the surface of the nickel-cobalt precursor with polydopamine in situ at room temperature by virtue of electrostatic interaction between negative ions and negative charges in the precursor and amido positive charges in dopamine hydrochloride, and then vulcanizing and carbonizing to obtain a target product. The coated carbon sphere layer is beneficial to accelerating the electron conduction rate of the nickel-cobalt sulfide, providing abundant reaction active sites, accelerating the kinetics of ion transmission in the oxidation-reduction reaction process, improving the structural stability of the electrode material, inhibiting the volume expansion of the active substance in the circulation process, and improving the specific capacitance, the rate and the circulation stability of the electrode.

The present invention relates to a preparation method and application of copper cobalt sulfide nanoflowers with chiral optical activity, belonging to the technical field of material chemistry. It directly prepares copper cobalt sulfide nanoflowers by a one-step method using a copper ion solution, a cobalt ion solution, a thioacetamide solution and penicillamine. The copper cobalt sulfide nanoflowers synthesized by the present invention have mirror-symmetric chiral optical activity, and the preparation method is simple and the enantioselective catalytic performance is excellent. The prepared material has important significance for promoting the development of fields such as food industry wastewater treatment, edible mushroom production, papermaking and textile, organic synthesis, and bioenergy.

The present invention provides a nickel disulfide / cobalt disulfide / nitrogen-doped carbon composite material, a preparation method thereof and an application thereof, belonging to the technical field of sodium-ion battery electrode materials. The nickel disulfide / cobalt disulfide / nitrogen-doped carbon composite material provided by the present invention comprises a heterogeneous structure body and nitrogen-doped porous carbon coated on the surface of the heterogeneous structure body; the heterogeneous structure body comprises nickel disulfide and cobalt disulfide. An internal electric field is formed by nickel disulfide and cobalt disulfide in the heterogeneous structure body of the present invention, which can accelerate the transmission of electrons and ions, improve the adsorption of sodium ions, and further improve the rate performance of the material; the coating of nitrogen-doped porous carbon can significantly improve the conductivity of the composite material and improve the rate performance of the material, and can also effectively avoid volume expansion during the charge and discharge cycle, thereby improving the cycle stability of the composite material.

The invention relates to a cobalt and nickel separation method. This method comprises: a heat treatment step (S1) in which a lithium ion secondary battery is heated and heat-treated; a pulverization and sorting step (S2) for obtaining an electrode material containing at least cobalt, nickel, copper and lithium by pulverizing and classifying the heat-treated lithium ion secondary battery; a leaching step (S3) for obtaining a leachate by immersing the electrode material in a treatment liquid containing sulfuric acid and hydrogen peroxide; a copper separation step (S4) in which a hydrogen sulfide compound is added to the leachate and stirred, and then solid-liquid separation is performed to obtain an eluent containing cobalt and nickel and a residue containing copper sulfide; and a cobalt-nickel separation step (S5) in which an alkali metal hydroxide is added to the eluent to adjust the pH, then a hydrogen sulfide compound is added, and stirring and solid-liquid separation are performed to obtain a precipitate containing cobalt sulfide and nickel sulfide and a residual liquid containing lithium.

The invention belongs to the field of supercapacitor electrode material preparation, and particularly relates to a two-step electrodeposition preparation method of a nickel-cobalt sulfide and nickel-cobalt double hydroxide heterojunction self-supporting electrode. The method comprises the following steps: (1) taking a solution prepared from nickel salt, cobalt salt and thiourea as a first electrolyte, and depositing nickel-cobalt sulfide on a conductive substrate by adopting a constant potential deposition method; and (2) taking a solution prepared from nickel salt and cobalt salt as a second electrolyte, and performing in-situ deposition of nickel-cobalt double hydroxide on the surface of the nickel-cobalt sulfide by adopting a constant potential deposition method to obtain the nickel-cobalt sulfide and nickel-cobalt double hydroxide heterojunction self-supporting electrode. The problems that an existing single-phase nickel-cobalt sulfide self-supporting electrode is low in specific capacitance; a single-phase nickel-cobalt double hydroxide self-supporting electrode is poor in multiplying power and cycle performance; and the preparation process of the existing super capacitor heterojunction composite self-supporting electrode is generally complicated.