20 results about "Cobalt sulphide" patented technology

The invention provides a preparation method of a composite material for a photo-anode, the photo-anode and a battery, the preparation method of the composite material comprises the following steps: (1) mixing citric acid, urea and ethylene glycol, stirring, heating, filtering and dialyzing, and freeze-drying a solution obtained after dialyzing to obtain carbon quantum dot powder; (2) dissolving thioacetamide and cobalt chloride pentahydrate into an aqueous solution of ethanol, adding the carbon quantum dot powder obtained in the step (1), stirring, carrying out hydrothermal treatment to obtain a precipitate, washing with absolute ethyl alcohol, and then centrifuging and drying to obtain carbon quantum dot doped cobalt sulfide powder; and (3) adding titanium dioxide and the carbon quantum dot doped cobalt sulfide powder obtained in the step (2) into an ethanol aqueous solution, stirring, carrying out hydrothermal treatment to obtain a precipitate, washing, centrifuging and drying to obtain a carbon quantum dot-cobalt sulfide-titanium dioxide composite material, namely the composite material for the photo-anode. According to the invention, higher photoelectric conversion efficiency is obtained.

The invention discloses a composite catalyst as well as a preparation method and application thereof. The composite catalyst comprises carbon nitride, cobalt sulfide and phosphorus. The composite catalyst provided by the invention utilizes the synergistic effect between carbon nitride and cobalt sulfide to regulate the electron and chemical structure of an active center and promote the generation and migration of photo-generated charges at the same time. The surface of the catalyst is modified by phosphorus, so that adsorption and activation of reactants CO2 and H2O molecules can be further promoted. According to the preparation method of the composite catalyst, the synthesis strategy is regulated and controlled, the cobalt sulfide is uniformly dispersed on the carrier, and the reduction activity and stability of carbon dioxide are improved. The catalyst is low in price, the preparation process is simple, the repeatability is good, and large-scale production is easy to carry out.

The application provides a method for preparing a cobalt sulfide electron probe standard sample by nanogrinding and high-pressure synthesis technology, which takes arsenopyrite monomineral powder as a matrix, adds metal cobalt powder into the matrix, ensures that the cobalt content in an initial sample composed of the arsenopyrite monomineral powder and the metal cobalt powder is greater than or equal to 0.2 wt%, selects an ethanol dispersant, obtains sample powder with nanoscale size by mechanical ball milling with the size of grinding balls changed, applies axial load to the sample powder, cold-presses the sample powder into a consolidated sample, and obtains a cobalt-containing arsenopyrite electron probe standard sample after polishing. The application solves the problem of low or uneven cobalt content in natural cobalt-containing sulfides, and successfully prepares a cobalt-containing arsenopyrite electron probe standard sample meeting the uniformity requirement under submicron spatial resolution by using nanogrinding technology and high-pressure synthesis sample preparation method.

The invention relates to the field of mineral separation, and discloses a flotation separation method for pyrite. The method comprises the following steps: dehydrating foam coarse sulfur cobalt ore obtained in a flotation desulfurization process; mixing the dehydrated coarse sulfur cobalt ore with water to prepare ore pulp, adding Na2S into the ore pulp, adjusting the temperature of the ore pulp, and performing primary stirring; naClO and CaO are added into the ore pulp obtained after primary stirring, the concentration of the ore pulp is controlled, and secondary stirring is conducted; an inhibitor and a foaming agent are added into the ore pulp, and then the ore pulp is subjected to one-time roughing flotation operation to obtain roughing concentrate and sulfur concentrate; and the roughing concentrate is subjected to three-time concentration flotation operation, and cobalt concentrate is obtained. According to the method, NaClO serves as an oxidizing agent, the floatability difference of different minerals is increased by means of the oxidability difference of the different minerals, and conditions are created for follow-up high-selectivity flotation. The cobalt concentrate obtained through the method is high in cobalt content, and the method is easy to operate, easy to control and low in agent cost.

The invention relates to the field of mineral separation, and discloses a method for preparing high-nickel-cobalt concentrate from sulfur-cobalt rough concentrate. The method comprises the steps that the cobalt sulfide rough concentrate is subjected to oxidizing roasting in the air atmosphere, and oxidizing roasting mineral powder is obtained; mixing the oxidized roasted mineral powder with limestone, boride and pulverized coal, and performing high-temperature reduction to obtain a reduction product; the reduction product is subjected to ore grinding treatment, and fine grinding minerals are obtained; and the fine grinding minerals are subjected to low-intensity magnetic separation, low-intensity magnetic concentrates and low-intensity magnetic tailings are obtained, and the low-intensity magnetic concentrates are high-nickel-cobalt concentrates. According to the method, through oxidizing roasting, reduction treatment, addition of the additive into the reduction raw materials, optimization of the reduction temperature and the like, the enrichment rate of cobalt and nickel is increased, and the high-nickel cobalt concentrate is obtained.

The application adopts microwave pyrolysis of waste plastic polyethylene terephthalate (PET) to prepare porous carbon catalytic material, and applies it to peroxymonosulfate (PMS) catalytic activation to degrade organic pollutants such as carbamazepine (CBZ). Microwave absorber cobalt nitrate and initial carbonized alpha-cellulose are used to assist the carbonization of waste plastic PET, and thiourea is used as a metal sulfidation reagent to prepare the waste plastic derived porous carbon material catalyst in a commercial microwave oven with a power of 800W for 10 minutes. The formation of cobalt oxide, the generation of cobalt sulfide, the introduction of C=O and oxygen vacancies, and the increase of specific surface area are all conducive to the improvement of the degradation performance of the catalyst to organic pollutants. The best catalyst S 0.3 -Co@P2C can achieve 100% CBZ degradation in 15 min, and the rate constant is 0.7445 min ‑1 . Compared with the traditional pyrolysis method, the microwave treated carbon material is not only more conducive to the formation and exposure of active sites (CoS and CoO) in the catalytic material, but also conducive to the generation of SO4 •‑ ·OH, O2 •‑ and 1 O2 by PMS catalytic activation. In addition, the introduction of PET is conducive to the formation of C=O in the catalytic material to promote PMS activation and accelerate the non-radical pathway to degrade CBZ.

Nickel Cobalt Sulfide Supercapacitor Electrode Device

The invention relates to a method for extracting copper and cobalt from copper-cobalt sulfide concentrate step by step, which comprises the following steps: placing the copper-cobalt sulfide concentrate in a reaction container, introducing mixed gas, heating and roasting to obtain roasted sand; mixing the roasted product with water for reaction, and carrying out solid-liquid separation to obtain cobalt-containing filtrate and copper-containing filter residues; mixing the copper-containing filter residues with dilute sulphuric acid for size mixing, then adding hydrogen peroxide for reaction, and performing solid-liquid separation to obtain copper-containing filtrate and filter residues; wherein the mixed gas comprises sulfur dioxide and air. According to the method, by reasonably controlling the roasting process conditions of the copper-cobalt sulfide ore, directional phase conversion of copper and cobalt is achieved, and therefore efficient extraction and utilization of valuable metal copper and cobalt are achieved through a wet leaching method.

The application belongs to the technical field of catalyst preparation, and provides a high-loading cobalt monatomic transition metal-based composite catalyst, a preparation method thereof and oxygen reduction application. ZIF material of the application is converted into nitrogen-phosphorus co-doped porous carbon through pyrolysis reaction combined with triphenylphosphine, the porous carbon is used as a carrier, and monatomic cobalt, cobalt nanoparticles, molybdenum species (MoC) and cobalt species (Co9S8) generated by pyrolysis are limited in the porous carbon. The nitrogen-phosphorus co-doped porous carbon can improve the conductivity of the catalyst, and the existence of phosphorus and nitrogen elements provides a stable environment for metal monatomic atoms, so that the catalyst has high metal loading while maintaining the monatomic structure. At the same time, Co9S8 generated by cobalt sulfide increases the metallicity of the catalyst, further provides rich catalytic active sites for the catalyst, so that the catalyst exhibits excellent performance in the oxygen reduction reaction, and the half-wave potential can reach 0.94 V, which is 90 mV higher than that of the Pt / C-based catalyst.

The application relates to the field of batteries, in particular to a preparation method of an iron cobalt sulfide / nitrogen-doped carbon composite material based on a spray drying method and application thereof. The method comprises the following steps: mixing a 2-methyl imidazole solution and a cobalt salt solution, then spray drying to obtain purple precursor powder, recrystallizing, exchanging iron ions to obtain Fe / ZIF-67, and finally forming an iron cobalt sulfide / nitrogen-doped carbon composite material derived from a ZIF-67 skeleton through a gas phase sulfuration method. The Fe / ZIF-67 is nanoscale in size and has high structural stability. When the iron cobalt sulfide / nitrogen-doped carbon composite material is used as a sodium ion battery negative electrode material, an internal electric field of an iron cobalt sulfide heterostructure can significantly improve ion diffusion kinetics, and meanwhile, a nitrogen-doped carbon matrix can improve the conductivity of the composite material and effectively relieve the volume change of the iron cobalt sulfide heterojunction in the electrochemical reaction process, so that the iron cobalt sulfide / nitrogen-doped carbon composite material exhibits excellent and stable sodium storage performance.

The invention discloses a carbon cloth three-dimensional structure loaded zinc sulfide cobalt composite material and a preparation method and application thereof, and belongs to the technical field of composite material preparation, the composite material is composed of carbon cloth, zinc sulfide cobalt nanoparticles and spiny structure TiO2; the carbon cloth is a carbon fiber substrate of a composite material, carbon fiber rods of the carbon cloth are interwoven to form the carbon cloth, the zinc sulfide cobalt nanoparticles uniformly cover the carbon fiber rods of the carbon cloth, and the titanium dioxide with the thorn-shaped structure is grown on the zinc sulfide cobalt nanoparticles in a wrapping manner. The prepared composite material has a relatively high specific surface area, and the carbon cloth provides excellent conductivity for the composite material. The binder-free composite material shows long-term cycling stability and excellent rate capability.

The application discloses a foam nickel loaded bimetallic phosphide / sulfide heterostructure hydrogen evolution catalyst and a preparation method thereof. Different from a preparation method of a general high-temperature phosphorization or sulfuration treatment corresponding precursor, the application adopts a mild and simple two-step electrodeposition method, taking nickel salt and cobalt salt as metal sources, taking thiourea as a sulfur source, and taking sodium hypophosphite as a phosphorus source. First, foam nickel with good conductivity is selected as a substrate, and nickel cobalt sulfide nanosheet arrays are directly grown on the foam nickel through cyclic voltammetry electrodeposition; then, nickel cobalt phosphorus nanoparticles are in-situ coated on the surface of the nickel cobalt sulfide nanosheet to obtain an electrocatalytic hydrogen evolution catalyst with a layered heterostructure. The catalyst prepared by the method has low cost, and also exhibits excellent alkaline electrocatalytic hydrogen evolution performance under a large current density, and has great potential in actual large-scale hydrogen production.

The invention relates to the application fields of catalyst preparation, performance detection and sterilization and pollutant degradation, and particularly discloses a method for chemical vapor deposition of an oxygen-containing cobalt sulfide cathode, which comprises the following steps: introducing a mixed carrier gas of a shielding gas and a reducing gas into a tubular furnace, and carrying out programmed heating to a preset high temperature to enable CoCl2 to react with S, vapor deposition is performed on a clean conductive substrate. After the reaction is finished, cutting off the reducing gas, and temporarily introducing air to slightly oxidize the sample, so as to directly obtain an electrochemical catalytic reaction cathode of the CoSOX / conductive substrate; the CoSOX / conductive substrate overcomes the defects that CoS is poor in stability, easy to oxidize and weak in adsorption capacity and CoO is weak in catalytic capacity and poor in conductivity, a large amount of < 1 > O2 can be stably and efficiently generated to kill harmful pathogenic bacteria in a water body in a broad-spectrum mode and effectively degrade organic pollutants such as rhodamine B, methyl orange and methylene blue, and the electrocatalytic sterilization system has extremely high practical application value.

The application provides a preparation method and application of a cobalt sulfide / nitrogen-doped titanium carbide / carbon paper composite anode. x The application solves the problems of easy aggregation and self-piling of a Ti3C2-based anode, easy leaching of metal ions of a cobalt sulfide-based anode, and easy destruction of a structure. x The application realizes derivation of typical Co-MOFs (ZIF-67) to amorphous CoS x , realizes compact growth to N-Ti3C2 interlayers and surfaces, and finally realizes common loading on carbon paper to obtain a CoS x / N-Ti3C2 / CP composite anode. The application utilizes N atom doping to regulate electronic structure and point defects to improve electronic transfer and ion diffusion dynamics, simultaneously utilizes MOFs-derived sulfides to have high specific surface area, high chemical stability and high conductivity to realize efficient degradation of organic pollutants, and has good application prospect in complex water purification and other fields.

The invention provides a two-dimensional heterojunction piezoelectric material for water treatment and a preparation method thereof, and belongs to the technical field of water treatment. The two-dimensional heterojunction piezoelectric material has a heterojunction structure formed by cobalt sulfide and molybdenum disulfide, and molybdenum disulfide has a 1T crystal phase and a 2H crystal phase. The two-dimensional heterojunction piezoelectric material has good conductivity, charge separation efficiency and stability, when the two-dimensional heterojunction piezoelectric material is applied to water treatment, the two-dimensional heterojunction piezoelectric material generates surface charges under the action of mechanical force and catalyzes and degrades various organic pollutants in water, application is flexible, and environmental adaptability is high.

The invention discloses a crystalline cobalt sulfide-amorphous cobalt phosphide composite material and a preparation method and application thereof, and relates to the field of hydrogen evolution reaction catalysis, the crystalline cobalt sulfide-amorphous cobalt phosphide composite material is composed of crystalline cobalt sulfide (c-Co3S4) and amorphous cobalt phosphide (a-CoPx), the composite material has a hollow nanocage structure, and is prepared by taking ZIF-67 as a template through hydrothermal vulcanization, annealing treatment and gas-phase phosphorization, and the composite material has a hollow nanocage structure. The obtained hollow nanocage structure is beneficial to electrolyte diffusion and bubble release, so that the hollow nanocage structure still has excellent HER activity and long-term stability under high current density; meanwhile, interface charge transfer is promoted, the local electronic structure of Co is regulated and controlled, the d-band center is moved downwards, the hydrogen adsorption effect is weakened through electronic regulation and control, and therefore the HER dynamic performance is improved; the amorphous phase provides a rich interface area and exposes more active sites, and the catalytic performance is further enhanced compared with a full-crystalline material.

The application belongs to the technical field of electrocatalytic materials, and specifically discloses in-situ carbon-coated cobalt sulfide / cobalt zinc sulfide composite material, a preparation method and application thereof. The preparation method comprises the following steps: dissolving cobalt nitrate hydrate, zinc nitrate hydrate and hexamethylenetetramine in decarburized water to prepare a precursor; performing sulfurization annealing on the precursor to obtain an intermediate product; and preparing a composite material by ultrasonic treatment of the intermediate product with hydrochloric acid. The in-situ carbon-coated cobalt sulfide / cobalt zinc sulfide composite material, the preparation method and the application thereof are used, and the in-situ carbon-coated cobalt sulfide / cobalt zinc sulfide composite material with a porous structure is successfully prepared through hydrothermal treatment, calcination and etching. The specific surface area is improved, and the catalytic performance is improved. Since the carbon-coated cobalt sulfide / cobalt zinc sulfide composite material is prevented from being corroded in an alkaline electrolyte, good durability and conductivity are achieved.

The invention discloses a preparation method of nickel-cobalt sulfide nanoparticles of a supercapacitor positive electrode material, and relates to a preparation method of a supercapacitor positive electrode material. The method solves the problems of loss of a large amount of raw materials, environmental pollution and agglomeration of the synthesized nickel-cobalt sulfide in the existing nickel-cobalt sulfide synthesis process. The method comprises the following steps: selecting cobalt nitrate, nickel nitrate and thioacetamide as a cobalt source, a nickel source and a sulfur source respectively, taking ammonium fluoride as a structure regulating agent, taking ultrapure water as a reaction medium, and synthesizing the nickel-cobalt sulfide through a simple one-step hydrothermal method. The positive electrode material prepared by the method disclosed by the invention is beneficial to reducing the cost in the synthesis process and the agglomeration of the material, and has the advantages of low cost, high specific capacity and high stability. The product is mainly used for the positive electrode material of the supercapacitor.

The present application relates to the technical field of metallurgical waste residue recycling, and particularly relates to a method for preparing high-purity nickel and cobalt by using nickel-cobalt sulfide residue. The method for preparing high-purity nickel and cobalt by using nickel-cobalt sulfide residue provided by the present application comprises the following steps: S11. The nickel-cobalt sulfide residue is sent to a ball mill for crushing, and then is screened to obtain nickel-cobalt sulfide residue powder; S12. Low-temperature roasting; S13. Acid leaching; S14. Cu removal by replacement; S15. Zn removal; S16. Extraction and stripping; S17. High-purity nickel and cobalt are obtained by electrodeposition. The present application adopts green low-temperature roasting, multi-stage purification and impurity removal, and electrodeposition technology to obtain high-purity nickel and cobalt, and has the advantages of low cost, green environmental protection, high nickel and cobalt recovery rate, high production efficiency and the like, and has important significance for industrialized comprehensive recycling of nickel-cobalt sulfide residue to prepare high-purity nickel and cobalt.

The invention relates to the technical field of recycling and reusing of metallurgical waste residues, in particular to a method for preparing high-purity nickel and cobalt from nickel-cobalt sulfide residues. The invention provides a method for preparing high-purity nickel and cobalt from nickel-cobalt sulfide slag. The method comprises the following steps that S11, the nickel-cobalt sulfide slag is conveyed into a ball mill to be crushed, and then nickel-cobalt sulfide slag powder is obtained through screening; s12, roasting at low temperature; s13, carrying out acid leaching; s14, Cu is removed through replacement; s15, Zn is removed; s16, extraction and reverse extraction; and S17, performing electrodeposition to obtain high-purity nickel and cobalt. According to the method, high-purity nickel and cobalt can be obtained through green low-temperature roasting, multi-stage purification and impurity removal and electrodeposition technologies, and the method has the advantages of being low in cost, environmentally friendly, high in nickel and cobalt recovery rate, high in production efficiency and the like and has important significance on the technology for preparing high-purity nickel and cobalt through industrial comprehensive recycling of nickel and cobalt sulfide residues.