173 results about "Cobalt metal" patented technology

The invention discloses an efficient combined regulator for easily-argillized copper oxide cobalt ore and a beneficiation method. The efficient combined regulator comprises the following components in parts by weight: 250-350 parts of sodium citrate and 1100-1200 parts of sodium hydrosulfide. Sodium citrate has high dispersing capacity, and the efficiency of selective adsorption between the argillization copper-cobalt ore and the medicament can be improved; meanwhile, the complexing ability of sodium citrate on ions, such as Fe, Ca and Mg, influencing agent adsorption on the surface of the ore is high, in addition, products obtained after complexing of the Fe, Ca and Mg ions can be dissolved in water, and action sites are provided for selective adsorption of a vulcanizing agent (NaHS) and a collecting agent amyl xanthate (PAX). According to the combined regulator and the beneficiation method provided by the invention, the problem of poor reagent selectivity in the flotation process of the argillization copper-cobalt ore can be obviously improved, the vulcanization effect of a vulcanizing agent is enhanced, and selective adsorption of a collecting agent is promoted, so that the recovery rate of copper and cobalt metals in the copper-cobalt oxide ore under the condition of serious ore argillization is improved.

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 relates to the technical field of electrocatalysts, and discloses a heterojunction catalyst composed of cobalt-copper co-doped ruthenium dioxide and metal ruthenium as well as a preparation method and application of the heterojunction catalyst. The preparation method comprises the following steps: carrying out hydrothermal reaction on cobalt salt and trimesic acid in a mixed solvent to prepare a cobalt metal organic framework precursor; a cobalt-copper bimetal organic framework is obtained through ion exchange of a copper salt solution; preparing a ruthenium-cobalt-copper ternary metal organic framework by adopting secondary ion exchange of a ruthenium salt solution; and carrying out air calcination treatment to obtain the cobalt-copper co-doped ruthenium dioxide and metal ruthenium heterojunction catalyst. According to the method, cobalt and copper atoms are uniformly doped in ruthenium dioxide crystal lattices through a step-by-step ion exchange strategy, and metal ruthenium nano-particles are grown on the surface in situ to form a heterogeneous interface. The obtained catalyst shows excellent performance in an acidic electrolyzed water anode oxygen evolution reaction, the overpotential is only 199 mV under the current density of 10 mA. Cm, and the stability can be maintained for 40 hours.

The invention discloses a nickel-cobalt metal-based wear-resistant and corrosion-resistant coating and a preparation method thereof, and relates to the technical field of surface coatings, and the technical key points of the nickel-cobalt metal-based wear-resistant and corrosion-resistant coating comprise the following steps: S1, carrying out oil removal and sand blasting roughening treatment on the surface of a metal substrate, then cleaning with absolute ethyl alcohol, and drying; s2, nickel-cobalt metal-based alloy powder is prepared, wherein the nickel-cobalt metal-based alloy powder is prepared from, by weight, 55-65 parts of nickel, 20-30 parts of cobalt, 15-18 parts of chromium, 4-6 parts of molybdenum, 3-5 parts of tungsten, 1-3 parts of iron, 0.8-1.5 parts of silicon, 0.5-1.2 parts of carbon and 0.5-1.0 part of boron; the technical effect is that a regular non-smooth micro-pit array is manufactured on the surface of a sprayed layer through interlayer laser micro-texturing treatment. And the molten particles of the next layer of spraying material are embedded into the micro pits to form a strong mechanical interlocking effect, so that the interlayer bonding strength and the anti-shearing capability are greatly improved, and interlayer dislocation and stripping are effectively prevented.

The present invention discloses a cobalt-based armor nanozyme and its preparation method and application. The method comprises uniformly mixing a cobalt salt solution, a 2,2'-bipyridine solution, and a g-C3N4 dispersion, performing sufficient reaction followed by pretreatment to obtain a precursor, and grinding and calcining the precursor to obtain the cobalt-based armor nanozyme. The cobalt-based armor nanozyme prepared by the present invention has high catalytic activity and the stability of carbonaceous materials. While ensuring efficient catalysis, it greatly reduces secondary pollution caused by cobalt metal leaching. The cobalt-based armor nanozyme can be used to remove organic pollutants from solid pollutants such as soil and water, and can also be used for targeted enrichment of numerous organic pollutants in contaminated wastewater, thereby improving removal efficiency.

The invention belongs to the technical field of cobalt metal preparation, and relates to an electric cobalt automatic washing and plate shearing system. Comprising a mini stacking type AGV, a six-axis robot, an intelligent travelling crane, a gantry type truss robot, a washing system (including a pickling tank, a washing tank and a scalding tank), a plate shearing system (including a plate shearing machine and a clipping machine), a gripper, a customized material frame, a running track and a ground charging type charging station. Aiming at the problems of low washing and plate shearing carrying efficiency, high labor intensity and the like, an integrated automatic system is designed, automatic cobalt plate washing, unmanned carrying, automatic sorting, automatic plate shearing machine feeding and barreling can be achieved, and the labor cost and potential safety hazards are greatly reduced.

The invention discloses a preparation method of an alcoholysis catalyst and application of the alcoholysis catalyst in regenerated DMT synthesis. Zinc, nickel and cobalt metal sources are synchronously loaded on a two-dimensional MXene material through an impregnation method, and then through hydrothermal treatment, calcination and carbon nitrogen compound encapsulation treatment, the self-assembled heterogeneous nitrogen-doped MXene-zinc / nickel / cobalt NC catalyst is prepared and used for ethylene glycol alcoholysis reaction of waste polyester textiles. The method comprises the following steps: carrying out ester exchange reaction on an alcoholysis product obtained by carrying out alcoholysis on the waste polyester textiles by using ethylene glycol and methanol to prepare impurity-containing regenerated DMT, and purifying the regenerated DMT through a reduced pressure sublimation method by utilizing the phase change characteristic of DMT crystals, thereby realizing the preparation of the high-purity regenerated DMT. The heterogeneous alcoholysis catalyst prepared by the method is high in catalytic activity, small in pollution, simple to prepare and easy to separate and recover, meanwhile, the purification process of the ester exchange product DMT is simplified, and the energy consumption and the cost are reduced.

The present application relates to the field of sodium ion battery, in particular to a kind of hard carbon negative material of fast charging sodium ion battery and preparation method thereof, for solving the shortcomings of existing hard carbon negative material of fast charging sodium ion battery, capacity is low, cycle performance is poor, limit the popularization of sodium ion battery in practical application problem;The present application can improve the conductivity and reaction kinetics of the material by doping nickel-cobalt metal oxide into nitrogen-containing hard carbon microspheres, thereby improving the theoretical capacity of the material, can significantly improve the charge-discharge rate of sodium ion battery, enhance the electrochemical performance of battery, and after being coated by composite gel structure, the structural stability of the material can be effectively improved, the volume change of the material in the cycle process is reduced, the cycle stability of sodium ion battery can be significantly improved, long cycle life and high capacity retention rate can be maintained while realizing fast charging, prolong the service life of battery.

The invention discloses a ruthenium-doped cobalt metal oxide nanosheet electrocatalyst and a preparation method and application thereof, and relates to the technical field of electrocatalysts.The preparation method comprises the steps that cobalt salt and trimesic acid are weighed and jointly dissolved in a methanol solution, and a mixed solution A is obtained after primary ultrasonic mixing treatment; dropwise adding a methanol solution containing ruthenium salt into the mixed solution A, carrying out secondary ultrasonic mixing treatment to obtain a mixed solution B, and carrying out hydrothermal reaction on the mixed solution B to obtain a ruthenium-cobalt metal organic framework precursor; and calcining the ruthenium-cobalt metal organic framework precursor. Compared with the prior art, the ruthenium-doped cobalt metal oxide nanosheet electrocatalyst prepared by the method shows excellent hydrogen evolution electrocatalytic activity and stability in an alkaline water electrolysis reaction, the performance of the catalyst is superior to that of a commercial platinum-carbon catalyst, and stable potential output can be kept in a 100-hour continuous test without obvious attenuation.

The invention provides a lithium battery valuable metal separation and recovery method based on multi-stage synergistic extraction. The method comprises the following steps: obtaining an electrode material from a waste lithium battery, and crushing and roasting the electrode material; carrying out multi-stage extraction on the roasted electrode material, and sequentially carrying out lithium element extraction, cobalt and nickel element extraction and manganese element extraction; and carrying out back extraction, separation and metal recovery on the lithium-containing organic phase, the cobalt-nickel-containing organic phase and the manganese-containing organic phase obtained by the multi-stage extraction to respectively obtain lithium carbonate, metal cobalt, metal nickel and manganese dioxide. According to the method, a multi-stage synergistic extraction process is adopted, a specific extraction agent and optimized extraction conditions are selected according to the properties of different valuable metals in the lithium battery, and the valuable metals are extracted in a graded and coordinated manner in combination with a pi-pi conjugated amphiphilic dissolution aid, so that the valuable metals such as lithium, cobalt, nickel, manganese and the like are efficiently separated and recycled, and the resource utilization rate is effectively increased.

The invention relates to the technical field of photocatalysis, in particular to a monatomic photocatalyst Co-COF-C4N as well as a preparation method and application thereof. COF-C4N is synthesized through a solvothermal method, and cobalt metal is anchored into a covalent organic framework through an impregnation method, so that the monatomic catalyst Co-COF-C4N is obtained. Compared with pure COF-C4N, the Co-COF-C4N has the advantages that the carrier separation efficiency can be improved, the yield of H2O2 produced through photocatalysis can be remarkably enhanced, and the yield of H2O2 is 6979 mu mol.g <-1 >. H <-1 > under irradiation of a xenon lamp and is 1.6 times that of the pure COF-C4N. The anchoring of cobalt atoms increases oxygen adsorption sites, improves the hydrophilicity of the photocatalyst, and greatly improves the yield of hydrogen peroxide. The hydrogen peroxide is produced through indirect 2e-ORR and direct 2e-WOR double channels in deionized water under the oxygen condition, and excellent photocatalytic stability is achieved.

The invention discloses a cobalt metal organic framework material Co-MOF, a composite membrane material, a preparation method and application, a thermodynamically stable three-dimensional layer-column structure Co-MOF is synthesized under the combined action of a dendritic carboxylic acid ligand and a linear bridging ligand, the Co-MOF is compounded with MC, and a Co-MOF-MC composite membrane material is constructed to serve as a friction electrode material. An electricity-wind driving rolling type friction nanometer generator (TENG) is built. And then, the rotating speed and the contact area of the device are adjusted, so that the output performance of the Co-MOF (at) MC-TENG device is effectively improved. The output performance of the electricity-wind driving rolling type Co-MOF (at) MC-TENG device is closely related to the contact area and the rotating speed, and under the optimal output, the Co-MOF (at) MC-TENG is used as a power supply to be connected with an electrolytic tank, so that the self-driven selective bromination reaction is realized.

The invention discloses an efficient combined collecting agent for copper cobalt oxide ore under a high-magnesium backwater system and a beneficiation method, and the efficient combined collecting agent comprises the following components in parts by weight: 200-300 parts of sulfosalicylic acid, 650-900 parts of ammonium dibutyl dithiophosphate and 650-900 parts of butyl xanthate. By means of the efficient combined collecting agent for the copper oxide cobalt ore and the beneficiation method, the foaming performance of the copper oxide cobalt ore in the flotation process under a high-magnesium backwater system can be improved, and meanwhile the recovery rate of copper and cobalt metal in the copper oxide cobalt ore concentrate can be obviously increased.

The invention belongs to the field of nano materials, and relates to a graded core-shell structure nickel-cobalt metal hydroxide nanosheet coated nitrogen-doped carbon nanofiber membrane and a preparation method and application thereof.The nitrogen-doped carbon nanofiber membrane is adopted as a conductive substrate, a graded core-shell structure nickel-cobalt metal hydroxide nanosheet array grows on the surface of the nitrogen-doped carbon nanofiber membrane, and the graded core-shell structure nickel-cobalt metal hydroxide nanosheet array is prepared. The core-shell structure refers to that a nanosheet is loaded on a nanosheet. The preparation method comprises the following steps: dissolving polyacrylonitrile and 2-methylimidazole in an N, N-dimethylformamide solution, carrying out electrostatic spinning to obtain a precursor nanofiber membrane, carrying out pre-oxidation and high-temperature carbonization to obtain a nitrogen-doped carbon nanofiber membrane, and then carrying out two-step hydrothermal reaction to obtain the nitrogen-doped carbon nanofiber membrane. The nitrogen-doped carbon nanofiber membrane material coated with the nickel-cobalt metal hydroxide nanosheet with the graded core-shell structure is obtained. The composite material prepared by the invention combines the high conductivity of the nitrogen-doped carbon nanofibers, the pseudocapacitance characteristic of the nickel-cobalt metal hydroxides and the advantages of the graded core-shell structure, and has excellent supercapacitor performance.

This invention discloses a SiC-supported LDH nanocomposite material, its preparation method, and its application as a microwave absorbing and corrosion-resistant material. The SiC-supported LDH nanocomposite material has a core-shell structure, wherein the core is silicon carbide nanowires and the shell is a layered bimetallic hydroxide doped with a third metal. nw The loading of the third metal-doped layered bimetallic hydroxide is 43.1%–168%. This invention improves the microwave absorption performance of the composite material by adjusting the LDH shell content and doping the LDH with cobalt to form a ternary LDH. Furthermore, the core-shell structure of the SiC-loaded LDH nanocomposite not only provides multiple scattering conditions for microwaves but also acts as a physical barrier, extending the corrosion path and acting as a labyrinth effect to hinder the intrusion of corrosive media. Moreover, the LDH memory effect and anion exchange effect further resist chloride ion intrusion, achieving a lightweight, integrated application of microwave absorption and corrosion protection.

[PROBLEM] To provide a surface-treated galvanized steel sheet, a resin film-coated steel sheet, and a building panel that have excellent corrosion resistance and processing adhesion to a resin film. [SOLUTION] The surface-treated galvanized steel sheet comprises: a steel sheet; a galvanized layer that is formed on the steel sheet; a first chemically-converted covered film layer that is formed on the galvanized layer and that contains 5 mg / m2 or more and less than 30 mg / m2 of cobalt metal; and a second chemically-converted covered film layer that is formed on the first chemically-converted covered film and that contains (a) a zirconium component, (b) a binding component originating from dehydration condensation of a silanol group, and (c) a urethane binding component.

The application discloses a kind of bifunctional catalyst and its application in microwave-assisted preparation of biodiesel, belong to catalysis technical field.The application introduces cobalt metal in ZIF-8 skeleton, when MOFs derivative is prepared by calcination, the introduction of transition metal can construct magnetic center, adjust the magnetic loss ability of derivative material, so that the prepared catalyst has strong wave-absorbing performance under 2.45GHz industrial microwave field, can effectively absorb microwave energy and convert it into heat energy, thereby improving the energy utilization efficiency of reaction system, and finally improving the catalytic performance of catalyst, further improve the preparation efficiency of microwave-assisted biodiesel, and has good application value and prospect in catalysis technical field.

The invention belongs to the field of nickel and cobalt metallurgy, and discloses a method for recovering nickel and cobalt metals in high-manganese-based black powder. According to the method disclosed by the invention, nickel and cobalt are completely converted into sulfate by utilizing a sulfating roasting process, and then nickel, cobalt and manganese completely enter an aqueous solution in an ionic state by utilizing a high-temperature water quenching method. In the process, nickel and cobalt are completely converted into high valence states by utilizing the weak oxidizability of the alkaline wastewater, and precipitation is carried out by virtue of the alkaline wastewater added in the process, so that nickel and cobalt and a small amount of manganese enter slag in the form of high-valence hydroxide, and most of manganese exists in the solution in the form of ions. By utilizing the process, the purpose of preferentially separating nickel and cobalt from the high-manganese-based battery black powder is achieved.

The invention discloses a cobalt / nitrogen co-doped carbon nanotube catalyst and a preparation method and application thereof, and the preparation method comprises the following steps: mixing a carbon nanotube, a nitrogen precursor, cobalt salt and an organic solvent to prepare a mixture, and calcining to obtain the cobalt / nitrogen co-doped carbon nanotube catalyst. According to the preparation method, under the combined action of the organic solvent and the nitrogen precursor, more cobalt metal can be infiltrated into the nanotubes, cobalt / nitrogen co-doping can be completed in the calcination process, and more cobalt nanoparticles can be uniformly dispersed in pores and on the surfaces of the pores on the premise that the original pore structure of the carbon nanotubes is not damaged; the prepared catalyst is complete in pore structure, rich in active site, stable in structure and excellent in catalytic performance, can be used for efficiently activating periodate as a novel catalyst with excellent performance, can realize efficient degradation of organic pollutants, and has very important significance on water environment restoration.

The invention discloses a three-dimensional cobalt metal organic complex and a preparation method and application thereof, and belongs to the technical field of crystal materials. The three-dimensional cobalt metal organic complex with the chemical formula of [Co (DPDA) (4, 4 '-bpy)] n is prepared by selecting 2, 5-diketopiperazine-N, N'-diacetic acid, 4, 4 '-bipyridine and cobalt ions as raw materials. The three-dimensional network structure has a six-connection three-dimensional network structure of a dual-core [Co2 (COO) 2] structural unit, and the topological symbol is {312.424. 59}. Besides, the three-dimensional cobalt metal organic complex can quickly activate peroxymonosulfate to effectively degrade dyes, can degrade three dyes, namely methylene blue, malachite green and crystal violet, to 95.0% or above within 5 minutes, does not generate toxic byproducts in the degradation process, and has a relatively good reuse rate. In addition, the three-dimensional cobalt metal organic complex is mild in synthesis condition and simple in step, has excellent structural stability and good thermal stability, and has antiferromagnetism at high temperature.

The invention discloses an efficient composite wave-absorbing material NiCo-C-PANI and a preparation method thereof, and belongs to the technical field of composite materials. The preparation method comprises the following steps: firstly, preparing NiCo-BTC by adopting a solvothermal method, dispersing the NiCo-BTC, and adding tris (hydroxymethyl) aminomethane and dopamine hydrochloride to obtain NiCo (at) PDA; secondly, carrying out high-temperature calcination on the NiCo-coated PDA to obtain NiCo-coated C; and finally, dispersing NiCo-C, adding hydrochloric acid, an aniline monomer and ammonium persulfate to obtain a mixed solution, and reacting to obtain a product. According to the preparation method disclosed by the invention, polydopamine is sequentially introduced to the surface of NiCo-BTC and is calcined to obtain a carbon-coated nickel-cobalt alloy composite material, and a layer of polyaniline is attached to the outer layer of the carbon-coated nickel-cobalt alloy composite material; due to the synergistic effect of interface polarization generated among all levels of the core-shell structure, dielectric loss of the carbon layer and polyaniline and magnetic loss of the core alloy, the material has good impedance matching performance and attenuation capacity; electromagnetic parameters of the composite material are regulated and controlled by adjusting the proportion of nickel and cobalt metal particles and changing the proportion of nickel and cobalt metal to carbon and polyaniline dielectric components, and the wave absorbing performance is improved.

The invention relates to the technical field of wastewater treatment, and particularly provides a preparation method of a boron-nitrogen co-doped cobalt monatomic catalyst, which comprises the following steps: S1, synthesizing a boron-nitrogen functionalized graphene quantum dot solution based on a graphene quantum dot precursor, an amino precursor and a boron source; and S2, obtaining the boron-nitrogen co-doped cobalt monatomic catalyst based on the boron-nitrogen functionalized graphene quantum dot solution, a cobalt source, a nitrogen source and carbon particles. According to the preparation method disclosed by the embodiment of the invention, cobalt and boron-nitrogen functional groups are subjected to chelation reaction, and cobalt monoatoms are stably and uniformly anchored on the surface of the cobalt monoatoms to improve the dispersity of the monoatoms, so that the purposes of preventing cobalt monoatom aggregation and improving the metal utilization rate are achieved. The prepared cobalt monatomic catalyst not only has high metal loading capacity (the cobalt metal loading capacity in the catalyst can reach 6-10 wt%) and monatomic dispersity, but also has high two-electron oxygen reduction capacity, and the number of active sites and the metal utilization rate in the persulfate activation process are remarkably increased.

The invention discloses a landfill leachate electrocatalytic plate in the field of electrocatalytic technology, a preparation method and an application thereof. After the surface of a titanium substrate is activated, ruthenium, iridium, copper and cobalt metal elements are introduced, and thioacetamide and 2-methylimidazole are used to form sulfur and nitrogen doping, and finally a multi-element heterojunction structure is formed on the titanium substrate. The catalytic activity of the electrocatalytic plate can be improved, the electrocatalytic plate has high pH stability and corrosion resistance, can adapt to long-term operation, and has strong recyclability and sustainability.

The utility model discloses a cobalt recovery device of a lithium iron phosphate battery, and relates to the field of metal recovery, the cobalt recovery device comprises a device bottom plate, the top of the device bottom plate is fixedly connected with a plurality of vertical plates, the tops of the vertical plates are fixedly connected with a support plate, the middle of the support plate is provided with a metal separation mechanism, and the top of the device bottom plate is provided with an electrodeposition collection structure. Through the structural arrangement, the cobalt recovery device of the lithium iron phosphate battery can be connected with the positive electrode and the negative electrode of an external power supply through the positive electrode connecting clamp and the negative electrode connecting clamp respectively, so that a solution in the collecting tank is electrified, then cobalt metal is gradually accumulated on the outer surface of the negative electrode block, and the power supply is turned off after the cobalt metal is accumulated to a certain degree; and then the negative electrode block is taken out, cobalt metal on the surface of the negative electrode block is collected, and therefore cobalt metal recovery is completed.

The present invention discloses a ruthenium-doped cobalt metal oxide nanosheet electrocatalyst, its preparation method and application, which relates to the technical field of electrocatalysts. The preparation method is as follows: Weigh cobalt salt and trimesic acid and dissolve them together in a methanol solution. After a first ultrasonic mixing treatment, a mixed solution A is obtained; Drop the methanol solution containing ruthenium salt into the mixed solution A. After a second ultrasonic mixing treatment, a mixed solution B is obtained. The mixed solution B is subjected to a hydrothermal reaction to obtain a ruthenium-cobalt metal-organic framework precursor; The ruthenium-cobalt metal-organic framework precursor is subjected to a calcination treatment. Compared with the prior art, the ruthenium-doped cobalt metal oxide nanosheet electrocatalyst prepared by the present invention exhibits excellent hydrogen evolution electrocatalytic activity and stability in the alkaline water electrolysis reaction. The performance of this catalyst is superior to that of commercial platinum-carbon catalysts, and it can maintain a stable potential output during continuous testing for 100 hours without obvious attenuation.

The invention discloses an in-situ growth carbon nanotube loaded iron-cobalt bifunctional catalyst as well as a preparation method and application of the in-situ growth carbon nanotube loaded iron-cobalt bifunctional catalyst, and relates to the technical field of zinc-air batteries. Comprising a nitrogen-iron co-doped carbon nanotube conductive network and iron-cobalt metal atoms loaded on the carbon nanotube conductive network, the nitrogen-iron co-doped carbon nano tube is used as a conductive network, the stable structure of the carbon nano tube is not affected, meanwhile, the carbon nano tube has a rich pore structure, rich iron-based active sites and a high specific surface area, iron-cobalt metal atoms are attached to the carbon nano tube more easily, and excellent catalytic performance is shown; the preparation method comprises the following steps: preparing a carbon nanotube conductive network, then loading iron-cobalt metal atoms on the conductive network, so that more iron-cobalt metal atoms are uniformly and firmly attached to the carbon nanotube conductive network, and through the interaction between iron-cobalt diatom catalytic active sites, the dual-function catalysis of ORR and OER is realized, and the performance of the zinc-air battery is improved.

A cobalt metal complex of 2-amino-4-hydroxy-6-methylpyrimidine, whose structural formula is as follows: #imgabs0# The synthesis method of the 2-amino-4-hydroxy-6-methylpyrimidine cobalt metal complex crystal I is to separately weigh CoCl2·6H2O (0.949 g, 3.99 mmol) and the ligand 2-amino-4-hydroxy-6-methylpyrimidine (1.0 g, 7.9 mmol)), dissolve them in 100 mL of anhydrous methanol and 25 mL of water, and reflux and stir for 30 hours. Perform hot filtration and allow natural evaporation at room temperature. After 3 days, light red crystals appear. The use of the 2-amino-4-hydroxy-6-methylpyrimidine cobalt metal complex crystal I is as an anticancer reagent, showing certain inhibitory activity in liver cancer cell experiments, and its IC 50 value is 21.72 ± 0.78.

The invention relates to the technical field of sewage treatment, in particular to preparation of a cobalt metal alkene-doped tungsten disulfide piezoelectric material and application of the cobalt metal alkene-doped tungsten disulfide piezoelectric material in synergistic degradation of antibiotics and hexavalent chromium. The material is prepared by combining a hydrothermal synthesis method with a chemical vapor deposition technology, and cobalt metal alkene is uniformly doped in a tungsten disulfide nanosheet layer to form a composite catalyst with excellent piezoelectric property. The material realizes efficient synergistic degradation of antibiotics and hexavalent chromium under the ultrasonic action, and has good cycle stability. The preparation method provided by the invention is simple and low in cost, and the obtained material has wide application prospects in the fields of sewage treatment, environmental remediation and the like, and is particularly suitable for efficient synergistic treatment of combined pollution.

Provided is a method for recovering nickel, cobalt, and manganese from a compound of a metal oxide containing nickel, cobalt, and manganese, the method increasing the concentration of nickel and cobalt while suppressing the concentration of manganese in the recovered product to a low level. The method for recovering nickel, cobalt, and manganese comprises: a mixing step in which a compound containing a metal oxide of nickel, a metal oxide of cobalt, and a metal oxide of manganese, and a reducing agent are mixed to produce a mixture; and a heating step for heating the mixture to obtain a first product and a second product having a higher manganese concentration than the first product. In the mixing step, at least one selected from the group consisting of a carbon reducing agent containing carbon as a constituent element, a silicon reducing agent containing silicon as a constituent element, and an aluminum reducing agent containing aluminum as a constituent element is used as the reducing agent, and the reducing agent is used in an amount satisfying a predetermined range.

[Problem] To provide: a nickel plating film that has suitable bath stability, pattern deposition properties, and plating deposition properties in a fine pad part, and excellent in solder connection reliability and surface smoothness; and an electroless nickel plating solution useful for forming the plating film. [Solution] A nickel plating film is formed on an object to be plated by subjecting the object to be plated to surface treatment using an electroless nickel plating solution that contains at least S2+ and a Co metal and in which the Co metal is included in the form of Co2+ and Co3+.