16 results about "Cobalt sulfide" patented technology

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 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 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.

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 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.

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 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.

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 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.

The invention relates to the technical field of non-noble metal heterojunction catalysts and preparation of the non-noble metal heterojunction catalysts, and discloses a double-sulfur non-noble metal heterojunction catalyst and a preparation method and application of the double-sulfur non-noble metal heterojunction catalyst. According to a stepped construction strategy of chemical oxidation-hydrothermal growth-sulfuration conversion, a Ni (OH) 2 nanosheet layer is grown on the surface of NF in situ by using a chemical oxidation method, then a Co-based precursor is loaded on the Ni (OH) 2 nanosheet layer by using a hydrothermal method, and finally, a heterojunction structure formed by tight coupling of nickel sulfide (Ni3S2) and cobalt sulfide (such as Co4S3) is successfully constructed through controllable sulfuration treatment. The two sulfides form strong coupling at an interface to cooperatively regulate and control an electronic structure, so that the conductivity, the active site density, the catalytic activity and the structural stability of the catalyst are remarkably improved.

The application provides a mercury adsorbent, a preparation method and application. The mercury adsorbent is a mesoporous material, and the mercury adsorbent comprises cobalt sulfide and biomass charcoal. The cobalt sulfide is loaded on the biomass charcoal, the cobalt sulfide is CoS2, and the mass percentage of the cobalt sulfide is 10-70%. The mercury adsorbent has the following advantages: the cobalt sulfide is uniformly dispersed, the mesoporous pore size of the mercury adsorbent is larger than the micropore size, the diffusion of mercury Hg is promoted, the mercury Hg is fully contacted with the cobalt sulfide, and the mercury Hg is adsorbed by the cobalt sulfide, so that the mercury adsorption capacity of the mercury adsorbent is improved. The mercury adsorbent has a high mercury adsorption capacity, and can effectively adsorb mercury.

What is provided is a method for separating cobalt and nickel including: a crushing and sorting step of crushing and classifying the lithium ion secondary battery to obtain an electrode material containing at least cobalt, nickel, copper, and lithium; a leaching step of immersing the electrode material in a processing liquid containing sulfuric acid and hydrogen peroxide to obtain a leachate; a copper separation step of adding a hydrogen sulfide compound to the leachate with stirring and subsequently carrying out solid-liquid separation to obtain an eluate containing cobalt and nickel and a residue containing copper sulfide; and a cobalt / nickel separation step of adding an alkali metal hydroxide to the eluate to adjust a pH and subsequently, adding a hydrogen sulfide compound with stirring and carrying out solid-liquid separation to obtain a precipitate containing cobalt sulfide and nickel sulfide and a residual liquid containing lithium.

This invention discloses a flexible, enzyme-free sweat glucose sensor based on a nickel-cobalt sulfide composite film and its preparation method, belonging to the field of flexible electronics and biosensing technology. The sensor uses a flexible insulating film as a substrate and integrates a screen-printed carbon electrode system. It adopts a short-time electrodeposition-intermediate treatment cycle process: after applying a 5V voltage to the carbon working electrode for 30 seconds, the electrode is removed, residual droplets in the non-working area are wiped off, and the electrode is air-dried at room temperature. This process is repeated 3 to 4 times, thereby growing a uniform, dense, and strongly adherent nickel-cobalt sulfide nanocatalytic film in situ on the electrode surface. This process effectively avoids the swelling of the flexible porous carbon electrode and the cracking of the catalytic film by controlling the single reaction time and the forced interruption treatment, realizing the stable integration of high-performance materials. The sensor has excellent flexibility, mechanical stability, and high sensitivity and high selectivity electrochemical response to glucose.

The invention discloses a method for drying cobalt hydroxide based on oxygen pressure leaching waste heat of copper-cobalt sulfide ore, which comprises the following steps: S1, carrying out oxygen pressure leaching on the copper-cobalt sulfide ore, and feeding the generated ore pulp into a primary flash evaporation system; s2, steam produced by the first-stage flash evaporation system is discharged into a cleaning system, and ore pulp is discharged into a second-stage flash evaporation system; s3, steam produced by the primary flash evaporation system is subjected to washing, gas-liquid-solid separation, purification and pH value adjustment, and clean steam is obtained; s4, secondary flash evaporation treatment is conducted on the ore pulp through a secondary flash evaporation system; s5, carrying out gas-liquid separation and washing on steam discharged by the second-stage flash evaporation system; s6, the cobalt precipitation pre-solution is subjected to preheating treatment and neutralization cobalt precipitation; and S7, drying the cobalt hydroxide wet material by using the obtained primary clean steam to obtain a cobalt hydroxide product. By means of the method, the problems that in the existing copper-cobalt ore treatment process, low-temperature waste heat cannot be conveyed, waste heat utilization is low, carbon emission is high, and exhausted gas pollutes the environment can be solved.