257 results about "COBALTOUS NITRATE" patented technology

A method of synthesis of single crystal nickel-rich cathode materials can include preparing a precursor solution by dissolving lithium nitrate, nickel nitrate, manganese nitrate, and cobalt nitrate in water, aerosolizing the solution of a) in a stream of air using an ultrasonic sprayer, preheating the resulting droplets, premixing the droplets with methane, decomposing the droplets by passing through a co-flow burner, depositing solid particles on a filter, and calcinating the solid particles in a furnace in oxygen to produce a single crystal cathode material.

The invention relates to the technical field of composite catalyst materials, in particular to a ferrocobalt bimetal hydroxide / BCN composite material and a preparation method and application thereof.The preparation method comprises the steps that cobalt nitrate and ferric nitrate are used for preparing a metal salt solution, sodium carbonate and sodium hydroxide are used for preparing a precipitant solution, a B-doped carbon nitride BCN material is added into the metal salt solution to form a uniform suspension, and the suspension is dried to obtain the ferrocobalt bimetal hydroxide / BCN composite material; dropwise adding the precipitant solution into the suspension to obtain a precursor solution, performing hydrothermal reaction on the precursor solution, and performing centrifugal impurity removal and drying to construct a heterostructure between layered double hydroxide and BCN in situ to obtain the Co-Fe LDH-coated BCN composite material. Through boron doping and heterostructure construction, the charge separation capacity of graphite carbon nitride is enhanced, the electron migration efficiency is improved through a heterointerface structure, the metal ion release amount and the cycle stability are controlled, and the catalytic performance is remarkably improved.

The invention discloses a self-template synthesized linear biochar-based bimetallic material as well as a preparation method and application thereof, and belongs to the technical field of carbon materials. The method comprises the following steps: pretreating ganoderma lucidum residues, and pyrolyzing in a nitrogen atmosphere to prepare charcoal; and mixing the prepared biochar with cobalt nitrate and sodium molybdate to prepare CoMoO4 nanoparticles with in-situ growth of the biochar, and then washing and drying to obtain the BC-coated CoMoO4 linear biochar-based bimetallic material. Heterojunctions formed by binding sites of cobalt-molybdenum bimetal and biochar in the material form more defect sites, the synergistic effect of the metal and the micro-nano fibrous biochar is exerted, the degradation rate in the application of catalytic degradation of bisphenol A can reach 98.18% or above, a multiple reaction mechanism with sulfate free radicals is jointly shown, and the photocatalytic degradation of bisphenol A is realized. And the method has higher adaptability and effectiveness for complex pollutants.

The invention relates to the technical field of domestic ceramics, in particular to a high-strength and high-gloss domestic ceramic and a preparation method thereof, and the high-strength and high-gloss domestic ceramic comprises the following raw materials in parts by weight: 35-45 parts of mullite, 15-20 parts of spodumene, 10-15 parts of quartz, 8-12 parts of a modifier doped with barium carbonate, 5-8 parts of a boric oxide additive and 7-11 parts of a yttrium-zinc reconditioning agent. According to the domestic ceramic, mullite, spodumene and quartz are used as matrixes, an added yttrium-zinc compound regulator is used as an antibacterial functional agent, nano-zinc oxide is blended into cobalt nitrate and yttrium nitrate solutions, sintering improvement is performed, and the antibacterial stability of the product is enhanced and optimized through compounding of yttrium, zinc and cobalt; meanwhile, the added modifier doped with barium carbonate and the boron oxide additive are mutually blended and coordinated, so that the antibacterial property, the glossiness and the strength of the obtained domestic ceramic are improved in a balanced and coordinated manner, and the product is remarkable in cold and heat resistance and temperature-resistant stability effect.

The invention relates to a preparation method of a bismuth ferrite-based composite material. The invention aims to solve the problems of poor conductivity and few active sites of the existing bismuth ferrite electrode material, and provides a preparation method of an efficient electro-catalytic hydrogen evolution catalyst. According to the method, bismuth nitrate, ferric chloride, ethylene glycol, ammonia water, sodium hydroxide, thiourea, ammonium molybdate and cobalt nitrate are used as raw materials, a two-step hydrothermal method is adopted, the bismuth ferrite-based cobalt-doped molybdenum disulfide composite material is prepared, and the preparation method is provided for improving the electro-catalytic hydrogen evolution performance of existing bismuth ferrite.

The invention belongs to the technical field of microalgae culture, and particularly provides a haematococcus pluvialis culture medium and a preparation method thereof.The haematococcus pluvialis culture medium is prepared from 1-3 mg / L of sodium acetate, 0.01-1 mg / L of cobalt nitrate hexahydrate, 0.01-1.6 mg / L of copper sulfate, 0.1-1.2 mg / L of zinc sulfate heptahydrate, 1-3 mg / L of manganese chloride tetrahydrate, 1-10 mg / L of boric acid, 1-30 mg / L of sodium carbonate, 1100-1500 mg / L of sodium nitrate, 0.01-6 mg / L of EDTA, 20-50 mg / L of calcium chloride, 70-100 mg / L of magnesium sulfate heptahydrate, 40-100 mg / L of monopotassium phosphate trihydrate and 0.02 g of inorganic phosphorus; the method comprises the following specific steps: S1, culturing haematococcus pluvialis to a stable phase by a conventional method, inoculating haematococcus pluvialis species into a haematococcus pluvialis culture medium, and culturing; s2, shaking table; s3, culturing for 45 hours; s4, inoculating the seed solution into a haematococcus pluvialis culture medium, and continuously culturing in the shaking table for 6-15 days; the culture medium disclosed by the invention has a good promotion effect on the growth of haematococcus pluvialis and the accumulation of astaxanthin.

The invention provides a monatomic cobalt-based composite catalyst, a preparation method of the monatomic cobalt-based composite catalyst and application of the monatomic cobalt-based composite catalyst to degradation of antibiotics by activating peroxymonosulfate, and belongs to the technical field of advanced oxidation. The method comprises the following steps: mixing biomass powder and water to obtain a biochar suspension, adding cobalt nitrate hexahydrate into the biochar suspension, centrifuging the mixed solution, collecting residues, and drying to obtain a sample; and pyrolyzing the sample in a protective gas atmosphere, taking out, cooling, washing, and drying to obtain the monatomic cobalt-based composite catalyst. The cobalt-based catalyst prepared by the invention has high specific surface area, abundant pore structures and a large number of active sites, and is beneficial to activation of PMS and degradation of pollutants; the cobalt-based composite catalyst prepared by the method is used for activating peroxymonosulfate to degrade tetracycline, and the removal rate of tetracycline in a solution is greater than 99% after reaction is carried out for 20 minutes under a dark condition.

The invention discloses a three-dimensional ordered macroporous nitrogen-doped carbon-loaded CoPt nanocluster material as well as a preparation method and application thereof. The method comprises the following steps: by taking a three-dimensional structure stacked by polymer microspheres as a template, firstly filling precursors 2-methylimidazole and cobalt nitrate in the three-dimensional template, then placing the three-dimensional template containing the precursors in a mixed solution of ammonia water and methanol for crystallization, and after crystallization, carrying out high-temperature pyrolysis, thereby obtaining the cobalt-based composite material. And finally, carrying out vapor deposition by using platinum acetylacetonate to obtain the three-dimensional ordered macroporous nitrogen-doped carbon-supported cobalt-platinum material. According to the invention, Co is presented as a nanocluster by using a template method and a pyrolysis method, and the nanocluster is anchored on a highly regular three-dimensional ordered macroporous nitrogen-doped carbon carrier; meanwhile, Pt introduced by vapor deposition brings a hydrogen overflow effect by activating hydrogen, so that the material shows excellent activity and selectivity in a carbon dioxide hydrogenation reaction and has a good application prospect.

The invention provides a manganese-doped ferrocobalt oxide nano particle-coated carbon-nitrogen cubic composite material as well as a preparation method and application of the manganese-doped ferrocobalt oxide nano particle-coated carbon-nitrogen cubic composite material. The preparation method comprises the following steps: firstly doping ferrous sulfate and manganese chloride into ZIF-8, then mixing the ZIF-8 with cobalt nitrate and 2-methylimidazole in methanol, carrying out centrifugal separation to obtain a product, and finally carrying out one-step calcination to realize carbonitriding of the composite material, doping of manganese and generation of nano particles from ferrocobalt oxide. And finally, the manganese-doped ferrocobalt oxide nanoparticle-coated carbon-nitrogen cubic composite material is obtained. Compared with the traditional preparation method, the method disclosed by the invention is simple, mild in reaction condition and high in yield, and the prepared composite material is uniform in morphology and has excellent electro-catalytic performance on the water electrolysis oxygen evolution reaction.

The invention provides a preparation method of a transition metal nitrogen-carbon nano composite material and application of the transition metal nitrogen-carbon nano composite material in detection of hydroquinone, and belongs to the technical field of composite material preparation.The preparation method comprises the steps that a cobalt nitrate solution and a 2-methylimidazole solution are mixed and fully react, and a mixed solution is obtained; carrying out solid-liquid separation on the mixed solution, and then washing and drying to obtain ZIF-67; dispersing polyacrylonitrile and polystyrene in an organic solvent together, and then adding the ZIF-67 to obtain a spinning solution; performing electrostatic spinning on the spinning solution to obtain a fiber membrane; the fiber membrane is subjected to pre-oxidation treatment and then calcined, a calcined product is cooled and then ground, and the transition metal nitrogen carbon nano composite material Co (at) NC is obtained. The nano composite material prepared by the method can quickly, simply, conveniently and sensitively detect hydroquinone, realizes quantitative analysis of HQ, and solves the problems that the existing HQ detection depends on large-scale instruments and equipment, the pretreatment time is long, the operation is tedious and the like.

The invention relates to the technical field of supercapacitors, and particularly discloses a spherical hollow multi-layer high-entropy metal oxide and a preparation method and application thereof. The spherical hollow multi-layer high-entropy metal oxide is prepared by the following steps: cross-linking metal cation nitrate comprising iron nitrate nonahydrate, zinc nitrate hexahydrate, copper nitrate hexahydrate, cobalt nitrate hexahydrate and nickel nitrate hexahydrate with dextrose monohydrate to generate spherical high-entropy metal hydroxide FeZnCuCoNi-HO with a solid core structure, and annealing to induce the metal hydroxide. And the spherical hollow multi-layer high-entropy metal oxide is formed. Compared with the prior art, the high-entropy metal oxide is prepared through a low-energy-consumption and simple synthesis method, the problem of volume change of the high-entropy metal oxide serving as an electrode material in the circulation process is solved, more reaction active sites are provided, an ion diffusion path is improved, and the specific capacitance of the composite material is improved while the specific capacitance of the composite material is improved. And the stability of the material is maintained, so that the energy storage performance of the supercapacitor is improved.

The invention belongs to the technical field of electrocatalytic reduction of CO2, and provides a Bi-based composite catalyst based on ZIF-67 as well as a preparation method and application of the Bi-based composite catalyst. The preparation method comprises the following steps: mixing 2-methylimidazole and methanol to obtain a methanol solution of 2-methylimidazole, and mixing cobalt nitrate and methanol to obtain a methanol solution of cobalt nitrate; the preparation method comprises the following steps: reacting a methanol solution of 2-methylimidazole with a methanol solution of cobalt nitrate to obtain ZIF-67; the preparation method comprises the following steps: mixing ZIF-67, methanol and an acid solution to obtain ZIF-67K; the preparation method comprises the following steps: reacting ZIF-67K, bismuth nitrate and water to obtain Bi-ZIF-67K; and the Bi-ZIF-67K is subjected to calcination. The ZIF-67 is used for providing a framework, so that the stability of the catalyst is improved, and the service life is prolonged; the ZIF-67 provides metal contact sites after being etched, active sites of Bi are exposed through calcination, and the activity, Faraday efficiency and selectivity of the catalyst are improved.

The invention provides a preparation method of a Fe-doped cobalt-manganese spinel catalyst, the cobalt-manganese spinel catalyst is prepared by a sol-gel method, and Fe is introduced for doping by an impregnation method. Firstly, a cobalt-manganese spinel catalyst is synthesized from raw materials such as cobalt nitrate hexahydrate, manganese acetate tetrahydrate and oxalic acid; and then, dipping the Fe-doped cobalt-manganese spinel in a mixed solution of iron nitrate nonahydrate and deionized water, drying, grinding and calcining to obtain the Fe-doped cobalt-manganese spinel catalyst. Fe doping can effectively improve the surface property and catalytic performance of the cobalt-manganese spinel catalyst. As a common 3d transition metal, the introduction of Fe enhances the activity of the catalyst to the reduction reaction of nitrogen oxides (NOx), and especially shows a significant catalytic effect at low temperature. At the temperature of 250 DEG C, the NOx conversion rate of the Fe-doped cobalt-manganese spinel catalyst reaches 84%. The preparation method of the catalyst is simple and convenient, low in cost, high in yield and suitable for treating NOx in industrial waste gas and automobile exhaust.

The invention discloses a preparation method of an ABO3 type perovskite catalyst for efficient catalytic oxidation of ethyl acetate, and belongs to the technical field of pollutant purification. The preparation method of the ABO3 type perovskite catalyst comprises the following steps: dispersing a metal salt A and a metal salt B in a solvent, then adding citric acid, carrying out a heating reaction, and then carrying out drying and roasting to obtain a perovskite material; the metal salt A comprises lanthanum nitrate or cerium nitrate; the B metal salt comprises cobalt nitrate or manganese nitrate; and etching the LaCoO3 perovskite material by adopting an acetic acid solution to obtain the ABO3 type perovskite catalyst. The conversion rate of the ABO3 type perovskite catalyst prepared by the method for catalyzing and oxidizing ethyl acetate at 169 DEG C reaches 90%, the ABO3 type perovskite catalyst has the advantages of low energy consumption, good catalytic activity, good stability and the like, and meanwhile, the ABO3 type perovskite catalyst is simple in preparation process and high in economic benefit.

The invention discloses MnO2 (at) ZIF-67 composite nanoparticles with high oxidase activity as well as a preparation method and application of the MnO2 (at) ZIF-67 composite nanoparticles. The preparation method comprises the following steps: uniformly mixing a potassium permanganate aqueous solution and a cerous nitrate aqueous solution to obtain a mixed solution I; and adding nitric acid into the mixed solution I, carrying out hydrothermal reaction to obtain a substance MnO2, uniformly mixing the obtained MnO2 and a methanol solution of PVP, adding cobalt nitrate hexahydrate and 2-methylimidazole, and standing to obtain the MnO2 ZIF-67 composite nanoparticles. The nano-particles with high enzymatic activity are prepared through a simple hydrothermal synthesis method, have good oxidase mimetic activity, catalyze O2 and TMB to rapidly develop color and become dark blue, and can specifically, sensitively and rapidly detect the total antioxidant capacity of cells, so that the nano-particles have good practical application value.

The invention belongs to the field of preparation of negative electrode materials, and provides a high-rate compacted negative electrode material and a preparation method thereof. The preparation method comprises the following steps: firstly, synthesizing ZIF-67 by taking cobalt nitrate and 2-methylimidazole as precursors, introducing tetraethoxysilane and tetrabutyl titanate through a sol-gel method for modification to obtain precursor powder, then heating the precursor in a tubular furnace by stages, and carrying out high-temperature carbonization in a mixed gas atmosphere to prepare an MOF derivative material; secondly, reacting the graphene oxide dispersion liquid with ascorbic acid in a nitrogen atmosphere to prepare partially reduced graphene oxide; mixing the graphene with a molybdenum disulfide dispersion liquid, and introducing dopamine, 3, 4-ethylenedioxythiophene, silver nitrate and the like to obtain a graphene-polymerized derivative; the preparation method comprises the following steps: uniformly mixing a base material, an MOF derivative material, carbon black, a graphene-polymerization derivative and the like to prepare negative electrode slurry, and carrying out gradient rolling and argon shield heat treatment to prepare the high-rate compacted negative electrode material.

The invention relates to the technical field of chemical synthesis, and discloses a method for preparing 2, 5-furandicarboxylic acid, which comprises the following steps: dispersing cobalt nitrate and nickel sulfate into an aqueous solution of polyvinylpyrrolidone at room temperature; adding a sodium borohydride solution to obtain nano colloid; preparing an aqueous suspension of cerium oxide, and adding the aqueous suspension into the nano colloid; centrifugally filtering, and recovering a solid product; washing the solid product; centrifuging, putting solid powder obtained after centrifuging into a drying oven, and drying; and calcining and grinding the solid powder to finally prepare the Co-Ni / CeO2 catalyst. And dissolving 5-hydroxymethylfurfural in water at normal temperature, adding the prepared Co-Ni / CeO2 catalyst and a sodium hypochlorite solution, reacting, and filtering to remove the catalyst, thereby obtaining the 2, 5-furandicarboxylic acid. The method disclosed by the invention has the advantages of no use of strong base, low reaction temperature, short reaction time, few byproducts, greenness and sustainability.

The invention relates to a Fenton-like system for regulating and controlling a Co-N microenvironment based on sulfur (S) and application of the Fenton-like system in efficient degradation of antibiotics. Cobalt sulfate (CoSO4) and cobalt nitrate (Co (NO3) 2) are used as raw materials, and the S-doped Co-N-based catalyst is prepared through high-temperature calcination (100-1200 DEG C). According to the catalyst, the Co-N microenvironment is regulated and controlled through S, the electronic structure and surface active site distribution of the catalyst are optimized, and the synergistic effect of double active sites (Co and N) is achieved. In the Fenton-like reaction, the catalyst can efficiently activate peroxymonosulfate (PMS) to generate various high-activity species (such as < 1 > O2 and high-valence metal), and the degradation efficiency of pollutants is remarkably improved. The catalyst shows excellent degradation performance on tetracycline in a wide pH range (pH 5-9), and the degradation efficiency is remarkably higher than that of a traditional Fenton system. In addition, the catalyst has good stability and reusability, and can still maintain high catalytic activity after being recycled. The S-regulated Co-N microenvironment catalyst and the Fenton-like system thereof provided by the invention have the advantages of simple preparation, mild reaction conditions, high degradation efficiency and the like, can be widely applied to the fields of sewage treatment, industrial wastewater treatment and the like, and provide a new solution for efficient treatment of antibiotic pollution in a water body.

A transition metal-doped copper oxide (CuO) nanoparticle film synthesis system (100) for the photoelectrochemical production of hydrogen, wherein the system (100) comprises: a heating vessel (102) configured for heating and mixing an ethanolamine-stabilized solution of copper acetate monohydrate in 2-methoxyethanol at 50-70 °C for 1-3 hours; an additive dispenser (104) connected to the heating vessel (102) and configured to introduce concentrated iron(III) chloride and cobalt nitrate into the heating vessel (102) to form a solution; a storage unit (106) connected to the additive dispenser (104), which is configured to age the prepared solutions at ambient temperature for 22-26 hours; a spin coater unit (108) connected to the storage unit (106) and configured to apply the prepared solutions to well-cleaned and dried glass substrates, i.e., CuO thin films, to form the CuO thin films doped with iron(III) chloride and cobalt nitrate; a drying unit (110) integrated with a heating plate (110a) and connected to the spin coater unit (108) configured to dry the coated layers at 130-170 °C, the coating and drying of the solution being repeated for six cycles to obtain a film of defined thickness using a multilayer deposition control unit; and a calcination chamber (112) connected to the drying unit (110) and configured to heat the obtained films to 350-450 °C in air for 1-3 hours to crystallize the CuO thin films doped with iron chloride and cobalt nitrate for the production of photoelectrochemical hydrogen.

The invention discloses a ruthenium-loaded nickel-cobalt oxide heterostructure electrocatalyst and a preparation method thereof.The preparation method of the ruthenium-loaded nickel-cobalt oxide heterostructure electrocatalyst comprises the steps that nickel nitrate hexahydrate, cobalt nitrate hexahydrate, ammonium fluoride and urea are dissolved in deionized water and stirred for 30 min, the mixture and carbon cloth are subjected to a hydrothermal reaction, cleaning, drying and calcination are conducted, and the ruthenium-loaded nickel-cobalt oxide heterostructure electrocatalyst is obtained; forming a second intermediate product; ruCl3.xH2O and KCl are added into H2O, magnetic stirring is conducted for 30 min, and a second process solution is obtained; and performing electrochemical deposition of ruthenium on the second intermediate product through cyclic voltammetry to obtain a third intermediate product, and drying the third intermediate product to obtain the ruthenium-loaded nickel-cobalt oxide heterostructure electrocatalyst. According to the preparation method of the ruthenium-loaded nickel-cobalt oxide heterostructure electrocatalyst provided by the embodiment of the invention, the proportion of ruthenium in the product is more easily regulated and controlled, so that the optimal nitrate electrocatalysis reduction performance is obtained.

The invention discloses a ferrocobalt-based self-supporting oxygen evolution electrode and a preparation method and application thereof, and belongs to the technical field of electrodes. The electrode is obtained by growing a layer of needle-like ferrocobalt layered double hydroxide catalyst on the surface of foamed nickel through a simple solution immersion-etching method and through preparation of a precursor solution. The preparation method comprises the following steps: mixing an isopropanol solution of cobalt nitrate with a ferrous sulfate aqueous solution, and putting a nickel-based substrate into the solution for immersion etching, so as to obtain the cobalt-iron layered double hydroxide catalyst electrode. The preparation method disclosed by the invention is mature and simple in process route, mild in condition, easy to control and easy to amplify, and the oxygen evolution (OER) catalytic activity of the nickel-based catalyst is also remarkably improved.

The invention provides a deep carbon removal method for silicon carbide powder based on plasma-assisted composite catalytic oxidation, which is characterized by comprising the following steps: S1, cleaning and drying silicon carbide powder raw materials with acid to obtain pretreated silicon carbide powder; s2, immersing the pretreated silicon carbide powder into a cobalt nitrate, manganese nitrate or ferric nitrate solution, and carrying out dispersion treatment, evaporation treatment and calcination treatment to obtain a metal oxide / silicon carbide composite catalyst; s3, placing the metal oxide / silicon carbide composite catalyst in a radio frequency plasma reactor, and carrying out an oxidation reaction; and S4, after the oxidation reaction is finished, carrying out post-treatment to obtain the carbon-removed silicon carbide powder. The carbon removal effect is obviously better than that of a traditional high-temperature oxidation method.

This invention discloses a hydrogenation and upgrading catalyst, its preparation method, and its application, belonging to the field of catalyst technology. The invention first pyrolyzes wheat straw into biochar, then mixes it with KOH and nitrides and calcines it to obtain nitrogen-doped biochar. The nitrogen-doped biochar is then mixed with a solution of cobalt nitrate and ammonium molybdate, dried, and calcined under nitrogen, followed by calcination under hydrogen to obtain a Co-Mo / NBC catalyst with Mo2C and Co3Mo3C as active components and nitrogen-doped activated biochar as the support. Because the nitrogen-doped activated biochar contains pyridine nitrogen as a coordination element for metallic Mo, Mo anchors pyridine nitrogen to form N-Mo, which promotes the dispersion of Mo2C and enhances the interaction between Mo2C and the nitrogen-doped biochar support. Furthermore, the addition of the promoter Co promotes Mo carburization, resulting in more Mo oxides forming Mo2C, and Co transfers electrons to Mo, making Mo electron-rich, significantly improving the hydrogenation activity of the catalyst. The catalyst maintains high desulfurization and denitrification rates even after at least seven reuses without any further treatment.

The invention discloses preparation of a nickel and cerium doped cobalt-based catalyst and application of the nickel and cerium doped cobalt-based catalyst in catalytic decomposition of nitrous oxide. The nickel and cerium doped cobalt-based catalyst is of a Ni and Ce co-doped spinel type Co3O4 structure and has a mesoporous structure, and the molar ratio of cobalt to nickel to cerium is 1: 0.12: 0.04. The preparation method comprises the following steps: preparing a mixed solution in which the molar ratio of cobalt nitrate to nickel nitrate to cerium nitrate is 1: 0.12: 0.04 by adopting a coprecipitation method, adding sodium carbonate as a coprecipitator into the mixed solution, adjusting the pH value of the mixed solution to 9 while stirring, carrying out coprecipitation and aging, then washing and drying the precipitate, and roasting for 3 hours in an air atmosphere at 300-400 DEG C to obtain the nickel and cerium doped cobalt-based catalyst. The catalyst provided by the invention has good low-temperature nitrous oxide decomposition capability and anti-interference capability under complex working conditions.

The invention relates to the field of ceramic ink, and discloses a black pigment, ceramic ink prepared from the black pigment and a preparation method of the ceramic ink. The high-tinting-strength cobalt black pigment is prepared by adopting cobalt nitrate, nickel nitrate, chromic nitrate and ferric nitrate according to the molar ratio of 38: 6: 31: 25, co-precipitating, drying to obtain powder, and calcining at the temperature of 1100-1200 DEG C to obtain the high-tinting-strength cobalt black pigment. The ink prepared from the high-tinting-strength cobalt black pigment prepared by the preparation method disclosed by the invention is pure in hue and strong in tinting strength, is particularly suitable for producing dark-color ceramic tile layout products such as black golden flowers and the like, and can well solve the problem that the black color is not pure enough.

The invention relates to the technical field of zinc hydrometallurgy, and discloses an analysis method for measuring high cobalt content by an EDTA complexing back titration method, which is based on the following steps: oxidizing Co < 2 + > into Co < 3 + > by using potassium nitrite in an acetic acid medium to form cobalt potassium nitrite precipitate so as to realize separation of cobalt and interfering ions, dissolving the precipitate, complexing with excessive EDTA, and performing back titration by using a zinc standard solution. Xylenol orange is used as an indicator, and determination is completed at room temperature in a hexamethylenetetramine buffer system with the pH value being approximately equal to 5.8. Coexisting ion interference is effectively eliminated through tartaric acid, sodium fluoride, thiourea and other masking agents, the method has the advantages of being easy and convenient to operate, sensitive in end point, high in accuracy and low in cost, and the requirement for conventional analysis of high-cobalt materials can be met.

The invention discloses an ion complexing generator anode catalyst and a preparation method thereof, and relates to the technical field of heavy metal wastewater treatment, the catalyst is used for treating complexing-state heavy metal industrial wastewater in the fields of electroplating industry, electronics factories, machinery factories, smelting plants and the like, and the catalyst comprises the following components in parts by mass: 2-5 parts of copper sulfate powder, 1-2 parts of sodium hydroxide, 1-2 parts of sodium hydroxide and the balance of water. The composite material comprises the following components in parts by weight: 5-8 parts of ferric nitrate powder, 9-12 parts of cobalt nitrate powder, 8-15 parts of nickel nitrate, 8-18 parts of potassium chloroplatinate, 1-5 parts of palladium nitrate, 0.5-1 part of rhodium chloride, 20-40 parts of graphene and 20-40 parts of magnesium nitrate.

The invention discloses a preparation method and application of a photocatalyst CuCo-coated TNS. The preparation method comprises the following specific steps: step 1, preparing TiO2 (001) nanosheet powder; 2, dissolving copper nitrate and cobalt nitrate in water to obtain a solution A; dispersing the powder prepared in the step 1 in water to obtain a solution B; introducing inert gas into the solution B, and dropwise adding the solution A into the solution B under the protection of inert atmosphere; then, the pH is adjusted to 10; after the reaction is carried out for 5 minutes to 60 minutes, a solid product CuCo coated LDH is collected; and step 3, heating the CuCo-coated LDH prepared in the step 2 to 200-300 DEG C in the atmosphere of H2, CO2 and Ar, calcining for 3-5 hours, and cooling to obtain the photocatalyst CuCo-coated TNS.

The invention discloses an indium-doped cobaltosic oxide catalyst as well as a preparation method and application thereof, and the indium-doped cobaltosic oxide catalyst is prepared according to the following method: 1) dissolving cobalt nitrate, urea and ammonium chloride in deionized water, and stirring to obtain a clear precipitate-free reaction solution; (2) transferring the reaction liquid into a reaction container filled with foamed nickel, and carrying out hydrothermal reaction to obtain the foamed nickel loaded with a sample; 3) washing the foamed nickel loaded with the sample after the reaction with ethanol and water, and drying; 4, the dried foam nickel loaded with the sample is soaked in an indium chloride solution, stirring reaction is conducted, vacuum drying is conducted, and indium-doped cobaltosic oxide is obtained.By means of indium doping, the morphology and components of the indium-doped cobaltosic oxide are regulated and controlled, and the activity and selectivity of the catalyst for electrochemical reduction of nitrite to produce ammonia are improved.

The invention discloses an air cathode Sn-CoSb / NC of a zinc-air battery and a preparation method of the air cathode Sn-CoSb / NC. The preparation method comprises the following steps: preparing a cobalt-doped ZIF-8 (Co-ZIF-8) precursor: mixing a methanol solution of dimethylimidazole with a methanol solution of zinc nitrate hexahydrate and cobalt nitrate hexahydrate, stirring at room temperature for 24 hours, centrifuging, washing and drying to obtain the Co-ZIF-8 precursor; the preparation method comprises the following steps: taking a small amount of N, N-dimethylformamide (DMF), adding tin tetrachloride pentahydrate and antimony trichloride, and stirring until the tin tetrachloride pentahydrate and the antimony trichloride are completely dissolved; then adding Co-ZIF-8 powder into the solution, stirring for 5 hours at room temperature, and then centrifuging and drying to obtain purple powder; and placing the powder in a tubular furnace, and carrying out high-temperature pyrolysis in an inert atmosphere to obtain the Sn-CoSb / NC electrocatalyst. The novel catalyst has excellent ORR functional activity, and as an air cathode of a zinc-air battery, high power density and excellent charge-discharge cycle stability are realized.