41 results about "Cobalt sulphide" patented technology

The invention discloses a preparation method and application of a CoxSy catalyst, and belongs to the technical field of catalyst preparation. According to the method, the morphology of CoxSy is regulated and controlled by using different solvents, so that four CoxSy catalysts with different morphology characteristics are synthesized. The catalyst is simple in preparation method and high in repeatability. The obtained CoxSy catalyst has a high specific surface area, more active sites can be exposed, reaction raw materials are in full contact with the active sites of the catalyst, and meanwhile, the catalyst has relatively high sulfur tolerance and rich sulfur vacancies, and is beneficial to adsorption and activation of H2S and CO2. Therefore, the obtained CoxSy catalyst shows high catalytic activity in a reaction for preparing methyl mercaptan through H2S and CO2 hydrogenation.

The invention discloses a method for promoting a cobalt sulfide loaded carbon composite catalyst to activate PMS to degrade pollutants by using bicarbonate ions. According to the method, bicarbonate radical ions are added into a system for degrading organic pollutants by activating the PMS with the cobalt sulfide loaded carbon composite catalyst, so that the efficiency of removing phenol by activating the PMS with the cobalt sulfide loaded carbon composite catalyst is greatly improved, and cobalt ion leaching is reduced due to addition of the bicarbonate radical ions; the cobalt sulfide loaded carbon composite catalyst has a wide application prospect in the field of advanced oxidation treatment of organic wastewater.

The invention relates to the field of batteries, in particular to a preparation method and application of an iron-cobalt sulfide / nitrogen-doped carbon composite material based on a spray drying method. The method comprises the following steps: mixing a 2-methylimidazole solution and a cobalt salt solution, performing spray drying to obtain purple precursor powder, performing recrystallization and iron ion exchange to obtain Fe / ZIF-67, and finally forming the ZIF-67 skeleton derived iron-cobalt sulfide / nitrogen-doped carbon composite material by a gas-phase vulcanization method. The Fe / ZIF-67 provided by the invention has a nanoscale size and high structural stability. When the iron-cobalt sulfide / nitrogen-doped carbon composite material is used as a sodium-ion battery negative electrode material, a built-in electric field constructed by an iron-cobalt sulfide heterostructure can remarkably improve ion diffusion kinetics; meanwhile, the nitrogen-doped carbon matrix can effectively relieve the volume change of the iron-cobalt sulfide heterojunction in the electrochemical reaction process while improving the conductivity of the composite material, so that the nitrogen-doped carbon matrix shows excellent and stable sodium storage performance.

The present invention provides a method for leaching and extracting cobalt and copper from copper-cobalt sulfide concentrate. The method includes: mixing the copper-cobalt sulfide concentrate with iron-aluminum slag for ore blending to obtain a mixed ore; mixing the mixed ore with water for pulp preparation to obtain a first pulp; subjecting the first pulp to pre-acid leaching at an acid-ore ratio of 150 kg / t to 220 kg / t to obtain a second pulp; subjecting the second pulp to oxygen pressure leaching and performing solid-liquid separation to obtain a leaching solution. The iron-aluminum slag is the waste slag precipitated in the process of neutralizing and removing iron and aluminum during the treatment of cobalt and copper in copper-cobalt sulfide ore. By mixing the copper-cobalt sulfide concentrate with iron-aluminum slag for ore blending, the present invention not only effectively improves the leaching rate of valuable metals Co and Cu in the copper-cobalt sulfide concentrate, but also realizes the resource recycling of the iron-aluminum slag generated during the treatment of cobalt and copper in copper-cobalt sulfide ore, reduces environmental pollution, and lowers production costs.

The invention provides a combined treatment method for copper-cobalt sulfide ore and cobalt oxide ore. The method comprises the following steps: mixing copper-cobalt sulfide ore with cobalt oxide ore to obtain a mixed ore material; the mixed mineral aggregate and a sulfur-fixing agent are mixed and roasted, and roasted sand is obtained; and mixing the roasted product with water and sulfuric acid, carrying out oxygen pressure leaching to obtain a leaching material, and carrying out solid-liquid separation to obtain a copper-cobalt leaching solution and leaching residues. According to the method, roasting and oxygen pressure leaching are combined for combined treatment of the copper-cobalt sulfide ore and the cobalt oxide ore, high-valence cobalt in the cobalt oxide ore can be reduced into low-valence cobalt which is easily dissolved in an acid solution through low-valence sulfide obtained through thermal decomposition of the copper-cobalt sulfide ore, the consumption of a reducing agent is reduced, the treatment cost is reduced, and the method is suitable for industrial production. According to the combined treatment method for the copper-cobalt sulfide ore and the cobalt oxide ore, sulfur dioxide is basically not generated in the roasting process, meanwhile, the leaching rate of copper and cobalt is remarkably increased by adopting an oxygen pressure leaching process, and the combined treatment method is low in production cost, small in environmental pollution and high in leaching rate of copper and cobalt.

The invention discloses a cobalt sulfide loaded nickel oxide composite material with a hollow regular hexahedron structure, which is prepared by the following steps: by taking C-ZIF-67 with a regular hexahedron structure as a substrate, performing etching by a solvothermal method to convert into cobalt sulfide CH-CoS with a hollow regular hexahedron structure; and then loading nickel oxide nanoparticles NiO on the hollow regular hexahedron structured cobalt sulfide CH-CoS through a solvothermal method and calcination to obtain CH-CoS / NiO. The preparation method comprises the following steps: 1, preparing the C-ZIF-67 with the regular hexahedron structure; 2, preparing CH-CoS with a hollow regular hexahedron structure; (3) preparation of CH-CoS / NiOH; and 4, preparing the CH-CoS / NiO with the hollow regular hexahedron structure. When the material is used as a supercapacitor electrode material, the mass specific capacitance is 1200-1300 F g <-1 >; 80-90% of the initial capacity is reserved after 5000 times of charge and discharge cycles; and the energy density is 30-40 Wh kg <-1 >.

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 invention discloses application of a cobalt sulfide composite material containing sulfur defects in catalyzing PAA to degrade organic pollutants, and belongs to the field of water treatment. The cobalt sulfide composite material is of a hollow microsphere structure, a spherical shell of a hollow microsphere is composed of two-dimensional thin nanosheets, and the two-dimensional thin nanosheets have two groups of different continuous lattice stripes and show high crystallinity; the cobalt sulfide composite material comprises a sulfur element and a cobalt element; the cobalt sulfide composite material contains sulfur defects. According to the material, a sulfur defect is introduced on the basis of cobalt sulfide, so that the catalytic activation capability on peracetic acid is enhanced, and the treatment efficiency on organic pollutants and heavy metals in water is improved. The raw materials are low in price, the preparation process is simple and easy to implement, the application process is clean and free of pollution, and the method is suitable for large-scale pharmaceutical wastewater, industrial wastewater, hospital sewage treatment and the like.

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 discloses a preparation method and application of an all-solid-state ion selective sensing chip, through a multi-metal active site regulation strategy, an ion-electron transduction interface of 3d transition metal cobalt sulfide (X-Co3S4, X = Mn, Fe, Co, Ni and Cu) derived on the basis of Co-LDH rich in micro / nano structures is developed, and the ion-electron transduction interface can be used for preparing the all-solid-state ion selective sensing chip. And a high-stability all-solid-state environment water quality hardness chip based on hydrophobic Cu-Co3S4 transduction is constructed. An expandable process for customizing the sensing chips in batches is provided, and large-scale manufacturing of the sensing chips is achieved through precise mold design and a tabletting forming technology. The Cu-Co3S4-based sensing chip capable of being customized on a large scale has high interface capacitance (568 [mu] F) and ultralow potential drift (the drift is 1.76 + / -0.01 [mu] V.s <-1 > within 36 hours), and shows good detection performance on Ca < 2 + > and Mg < 2 + >.

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.

The invention discloses an oxygen evolution reaction electrocatalyst with a nitrogen-doped cobalt sulfide heterostructure and used for direct electrolysis of seawater for hydrogen production and energy storage and a preparation method of the oxygen evolution reaction electrocatalyst. During preparation, foamed nickel is used as a substrate, and a self-supporting cobalt hydroxide nanosheet is formed on the foamed nickel substrate; soaking the foamed nickel loaded with the cobalt hydroxide nanosheet in a sulfide solution to obtain a foamed nickel sheet loaded with cobalt sulfide; and placing the cobalt sulfide-loaded foamed nickel sheet in a plasma-assisted chemical vapor deposition system, and doping with nitrogen plasma to obtain the nitrogen-doped cobalt sulfide heterostructure electrocatalyst. The layered heterostructure in the electrocatalyst has a large specific surface area and high surface loading capacity, and doped nitrogen improves the conductivity of the material; in a seawater electrolysis oxygen evolution system, the overpotential is low, the current density is large, and the excellent oxygen evolution reaction catalytic activity is achieved; in addition, the catalyst has excellent stability and durability in a seawater electrolysis environment.

The invention relates to the technical field of electrode material preparation, in particular to a self-supporting nitrogen-doped carbon layer coated nickel-cobalt sulfide nanobelt / foamed nickel electrode material and a preparation method and application thereof, a nickel-cobalt sulfide nanobelt grows on the surface of foamed nickel in situ, and the surface of the nickel-cobalt sulfide nanobelt is coated with a nitrogen-doped carbon layer. The preparation method comprises the following steps: growing a nickel-cobalt nanobelt precursor with controllable morphology on a foamed nickel skeleton in situ, coating the surface of the nanobelt with polydopamine in situ at room temperature by virtue of electrostatic interaction between negative charges (OH <-> and CO3 < 2->) in the precursor and amino positive charges in dopamine hydrochloride, and vulcanizing and carbonizing to obtain a target product. The nitrogen-doped carbon 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 an active substance in the circulation process, and improving the specific capacitance, the rate and the circulation stability of the electrode.

Nickel Cobalt Sulfide Supercapacitor Electrode Device

The invention provides a combined beneficiation and smelting method for high-calcium-magnesium-copper-cobalt ore. The method comprises the steps that first flotation is conducted on the high-calcium-magnesium-copper-cobalt ore, and copper-cobalt sulfide roughing concentrate and copper-cobalt sulfide roughing tailings are obtained; a reducing agent is added into the copper-cobalt sulfide roughing concentrate for roasting, and after roasting slag is obtained, normal-pressure leaching is conducted, and normal-pressure leaching liquid and normal-pressure leaching slag are obtained; a vulcanizing agent is added into the copper-cobalt sulfide roughing tailings for vulcanization, then a second collecting agent is added for second flotation, and copper-cobalt oxide roughing concentrate and copper-cobalt oxide roughing tailings are obtained; performing magnetic separation on the copper cobalt oxide roughing tailings to obtain cobalt oxide magnetic separation concentrate; and finally, the normal-pressure leaching residues, the copper cobalt oxide roughing concentrate and the cobalt oxide magnetic separation concentrate are mixed for oxygen pressure leaching, and oxygen pressure leaching liquid and oxygen pressure leaching residues are obtained. According to the method, efficient leaching of copper and cobalt in the high-calcium-magnesium-copper-cobalt ore is carried out by adopting a sulfur-oxygen flotation enrichment-normal-pressure oxygen-pressure combined leaching process, the process is simple, the cost is low, and the copper and cobalt recovery rate is high.

The present invention provides a method for jointly treating copper-cobalt sulfide ore and cobalt oxide ore. The method includes: mixing the copper-cobalt sulfide ore and the cobalt oxide ore to obtain a mixed ore material; mixing the mixed ore material with a sulfur-fixing agent and roasting to obtain roasted ore; mixing the roasted ore with water and sulfuric acid for oxygen pressure leaching to obtain a leaching material, and after solid-liquid separation, obtaining a copper-cobalt leaching solution and a leaching residue. The present invention combines roasting and oxygen pressure leaching for the joint treatment of copper-cobalt sulfide ore and cobalt oxide ore. The low-valent sulfide thermally decomposed from the copper-cobalt sulfide ore can reduce the high-valent cobalt in the cobalt oxide ore to low-valent cobalt that is easily soluble in acidic solution, reducing the consumption of reducing agents and lowering the treatment cost. Basically, no sulfur dioxide is generated during the roasting process. At the same time, by adopting the oxygen pressure leaching process, the leaching rates of copper and cobalt are significantly increased. It is a method for jointly treating copper-cobalt sulfide ore and cobalt oxide ore with low production cost, small environmental pollution, and high leaching rates of copper and cobalt.

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 invention discloses a preparation method of an L-cysteine modified island-shaped cobalt sulfide-cobalt oxide heterogeneous nanosheet array / carbon paper used as an electrochemical chiral sensor electrode material. The invention aims to design an electrochemical chiral sensor of a triangular nanosheet heterojunction array so as to realize recognition and quantitative detection of chiral molecules. The method mainly comprises the following steps: 1, growing a Co-based metal organic framework (Co-MOF) triangular nanosheet array on carbon paper at room temperature; 2, calcining the Co-MOF precursor at a high temperature to prepare a cobalt oxide array / carbon paper material (Co3O4 / CP); 3, preparing a cobalt sulfide-cobalt oxide triangular nanosheet array / carbon paper material (Co3S4-Co3O4 / CP) by a hydrothermal vulcanization method; and 4, assembling L-cysteine on the cobalt sulfide-cobalt oxide triangular nanosheet array / carbon paper material (L-Cys (at) Co3S4-Co3O4 / CP) in a liquid phase manner. The synthesis method has the advantages of simplicity, easiness in operation, low energy consumption and the like. The cobalt sulfide-cobalt oxide heterostructure array with good conductivity and L-cysteine (L-Cys) containing abundant chiral sites have a synergistic effect, so that the electrode obtains satisfactory chiral recognition efficiency (IL / ID = 1.50), the electrode shows high current response to L-tryptophan (L-Trp), the sensitivity is 0.33 A.M <-1 >, and the detection limit is 0.021 M (S / N = 3).

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 invention discloses a preparation method and application of a self-supporting cobalt sulfide electrode and a preparation method and application of a self-supporting cobalt sulfide-molybdenum disulfide heterojunction electrode, and belongs to the technical field of electrodes. The self-supporting cobalt sulfide electrode is prepared by compounding CoSx nanoparticles and activated carbon fiber paper together through melamine formaldehyde-polyethyleneimine resin and then performing high-temperature annealing. The self-supporting cobalt sulfide-molybdenum disulfide bifunctional heterojunction electrode is prepared by compounding CoS < x >-coated MoS2 nanoparticles and activated carbon fiber paper together by melamine formaldehyde-polyethyleneimine resin, and then performing high-temperature annealing to obtain the self-supporting cobalt sulfide-molybdenum disulfide bifunctional heterojunction electrode. The two self-supporting electrodes provided by the invention have long service life, high catalytic activity, high stability and relatively strong by-product interference resistance, green and environment-friendly materials and processes are adopted in the preparation process, and compared with a traditional complex multi-step preparation method, the scheme adopts simplified processes such as high-temperature annealing, so that the production energy consumption is remarkably reduced, and the production cost is reduced. The method is suitable for large-scale industrial production.

The invention discloses a preparation method of a high-dispersion cobalt sulfide and nitrogen-doped carbon coated cobalt composite material catalyst, which comprises the following steps: firstly, synthesizing a precursor which is loaded with a cobalt source and has rich nitrogen source and carbon source by utilizing a water bath, and then calcining at high temperature in a nitrogen atmosphere to obtain Co (at) CN; and finally, obtaining the high-dispersion cobalt sulfide and nitrogen-doped carbon coated cobalt composite material catalyst in a hydrothermal in-situ vulcanization manner. The high-dispersion cobalt sulfide and nitrogen-doped carbon coated cobalt composite material catalyst prepared by the method provided by the invention has more sulfur vacancies and nitrogen vacancies, and can promote the adsorption and dissociation of the catalyst to H2S and benzonitrile when being applied to the reaction of H2S and benzonitrile to prepare thiobenzamide, and the carbon-nitrogen material carrier has a rich pore structure, so that the adsorption and dissociation of the catalyst to H2S and benzonitrile can be promoted. The sufficient contact of H2S and benzonitrile with the active sites of the catalyst can be promoted, so that the catalytic activity is improved.

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 present invention relates to the technical field of electrode material preparation, and specifically to a self-supporting nitrogen-doped carbon layer-coated nickel cobalt sulfide nanobelt / nickel foam electrode material, its preparation method and application. The nickel cobalt sulfide nanobelt grows in-situ on the surface of nickel foam, and the surface of the nickel cobalt sulfide nanobelt is coated with a nitrogen-doped carbon layer. In the present invention, a nickel cobalt nanobelt precursor with controllable morphology is first grown in-situ on the nickel foam skeleton. By means of the electrostatic interaction between the anionic (OH ‑ 、CO3 2‑ ) negative charge in the precursor and the amine positive charge in dopamine hydrochloride, polydopamine is coated on the surface of the nanobelt at room temperature in-situ, and then the target product is obtained through sulfidation and carbonization. The nitrogen-doped carbon layer is beneficial to accelerating the electron conduction rate of nickel cobalt sulfide, providing abundant reaction active sites, accelerating the kinetics of ion transport in the redox reaction process, improving the structural stability of the electrode material and inhibiting the volume expansion of the active substance during cycling, and improving the specific capacitance, rate and cycling stability performance of the electrode.

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 provides a method for leaching and extracting cobalt and copper in copper sulfide cobalt concentrate. Comprising the steps that copper-cobalt sulfide concentrate and iron-aluminum slag are mixed and blended, and mixed ore is obtained; the mixed ore and water are mixed and subjected to pulp mixing, and first ore pulp is obtained; pre-acid leaching is conducted on the first ore pulp according to the acid-ore ratio of 150 kg / t-220 kg / t, and second ore pulp is obtained; and carrying out oxygen pressure leaching on the second ore pulp, and carrying out solid-liquid separation to obtain a leachate. The iron-aluminum slag is waste slag which is precipitated in the procedure of removing iron and aluminum through neutralization in the cobalt and copper extraction treatment process of the copper-cobalt sulfide ore. According to the method, the copper-cobalt sulfide concentrate and the iron-aluminum slag are mixed for ore blending, so that the leaching rate of valuable metals such as Co and Cu in the copper-cobalt sulfide concentrate is effectively increased, resource reutilization of the iron-aluminum slag generated in the cobalt and copper extraction treatment process of the copper-cobalt sulfide ore is realized, the environmental pollution is reduced, and the production cost is reduced.

The invention discloses a cobalt disulfide / graphite phase carbon nitride nano-composite catalyst as well as a preparation method and application thereof. The preparation method of the cobalt disulfide / graphite phase carbon nitride nano composite catalyst comprises the following steps: dispersing g-C3N4 in deionized water, and stirring to obtain a g-C3N4 solution; dispersing a Co source in deionized water and stirring to obtain a Co source solution, and dispersing an S source in deionized water and stirring to obtain an S source solution; a Co source solution and an S source solution are sequentially added into a g-C3N4 solution to be stirred to obtain a mixed solution, the mixed solution is stirred, cooled, washed and dried at the temperature of 175-183 DEG C to obtain the cobalt disulfide / graphite phase carbon nitride nano-composite catalyst, 100% tetracycline can be removed by the cobalt disulfide / graphite phase carbon nitride nano-composite catalyst within 10 min, the cobalt dissolution concentration is 0.782 mg / L, and the cobalt dissolution concentration is 0.782 mg / L; and the cobalt standard limit value in China Environmental Quality Standards for Surface Water is met.