319 results about "COBALTOUS NITRATE" patented technology

The invention relates to the technical field of biocatalysts, in particular to a FeCo-NC bimetallic monatomic nano-enzyme as well as a preparation method and application thereof. The preparation method of the nano enzyme comprises the following steps: preparing Co-ZIF-8 from zinc nitrate, cobalt nitrate and 2-methylimidazole; the Co-ZIF-8 and ferric chloride are used for preparing the FeCo-NC bimetallic monatomic nano-enzyme, the molar ratio of the zinc nitrate to the cobalt nitrate is (20-30): 1, and the molar ratio of the cobalt nitrate to the ferric chloride is (2-6): 1. The nano-enzyme prepared by the embodiment of the invention is of a monatomic structure, has double-enzyme activity, can simultaneously simulate catalase and NADH oxidase, and has the capability of removing active oxygen.

The invention relates to the technical field of energy materials, and discloses a self-assembled low-crystallization nanoflower-shaped polyoxometallate catalyst and a preparation method and application thereof.The preparation method comprises the steps that firstly, cobalt nitrate hexahydrate, iron nitrate nonahydrate, CH4N2O and Finke Co are used as raw materials, Finke Co and Fe < 3 + > are grown on nickel foam in situ, then the Finke Co and Fe < 3 + > react with ZIF-67 (Co), and a Finke Co-FeCoNi precursor with a stable structure is prepared; finally, the precursor is subjected to vulcanization, and the nano flower-shaped polyoxometallate catalyst Finke Co-FeCoNi / S is obtained. According to the preparation method, Finke Co is added, so that the crystallinity of the catalyst material is reduced, the catalyst material is assembled into a nanoflower-shaped structure, the low crystallinity can provide more coordinated unsaturated sites and improve the conductivity, and the nanoflower-shaped form exposes more defect sites, so that the reaction contact area is increased, and the catalytic activity is improved.

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 preparation method and application for directly growing CuCoO2 on foamed nickel, and the preparation method comprises the following steps: dissolving copper nitrate, cobalt nitrate and a mineralizer in a solvent, intensely stirring to form a suspension A, then transferring the suspension A into a high-pressure kettle, and carrying out vacuum drying to obtain CuCoO2; meanwhile, the foamed nickel is placed in a polytetrafluoroethylene flower basket and then placed in an autoclave to be heated for a hydrothermal reaction, and after the hydrothermal reaction is finished, the foamed nickel is cooled to the room temperature. According to the method, the CuCoO2 electrode with the foamed nickel substrate can be prepared in one step, compared with a method for preparing CuCoO2 powder and then transferring the CuCoO2 powder to an electrode plate, the needed time is short, operation is easy, the electrode material is uniform, and the method can be widely applied to related fields as an efficient photoelectric functional material electrode preparation method.

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 discloses a preparation method of an MOF-on-MOF material, and belongs to the technical field of electrocatalysts.The preparation method comprises the steps that firstly, nickel acetate tetrahydrate and terephthalic acid are added into a mixed solvent composed of deionized water and N, N-dimethylacetamide, stirring reaction is conducted at the temperature of 140-160 DEG C, and Ni-MOF is synthesized; mixing and dissolving ferric nitrate nonahydrate and cobalt nitrate in a molar ratio of 1: 5 in deionized water, then adding a sodium acetate aqueous solution, and synthesizing a Fe2Co (mu3-O) cluster after stirring reaction; and then adding the Ni-MOF and the Fe2Co (mu3-O) cluster into deionized water, carrying out ultrasonic treatment, carrying out solid-liquid separation, and washing and drying a solid product to obtain the Ni-MOF / Fe2Co (mu3-O) cluster. Compared with an existing method, the method is easy to operate and low in cost, and the prepared MOF-on-MOF material has excellent electrocatalytic activity and stability in an electrocatalytic oxygen evolution reaction and is particularly suitable for being used in the field of hydrogen production through water electrolysis.

The invention belongs to the technical field of water treatment, and discloses an oxygen-containing functional group modified cobalt-based carbon nanotube as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing and stirring functionalized carbon nanotubes, cobalt salt, cyanuric acid, melamine and a solvent, and then performing centrifugal separation, washing and drying to obtain a precursor; calcining the precursor in a protective atmosphere, and then pickling to obtain the oxygen-containing functional group modified cobalt-based carbon nanotube. Cobalt nitrate is used as a cobalt source, cobalt exists in the form of ions, in the calcining process, cobalt is embedded into a carbon nano tube by means of nitrogen of melamine, cobalt monoatoms exist, cobalt clusters are generated, oxygen-containing functional groups and the cobalt clusters have a regulation and control effect on a charge structure of an active center of the cobalt monoatoms, and the oxygen-containing functional groups and the cobalt clusters have a regulation and control effect on the active center of the cobalt monoatoms. The electric charge density of a cobalt monatomic active center is weakened together, and the binding energy to an intermediate OOH is regulated and controlled, so that the material is a 2e--ORR electrocatalyst with high activity and high selectivity.

The invention discloses a preparation method of a metal atom doped cobaltosic oxide electrolyzed water catalyst, and relates to a preparation method of an electrolyzed water catalyst. The invention aims to solve the problems of high cost, slow reaction in an acid environment and relatively high overpotential of the existing electrolytic water oxygen evolution catalyst prepared from noble metals and compounds thereof. The preparation method comprises the following steps: 1, dissolving cobalt nitrate in a solvent, and uniformly stirring; 2, adding the metal salt into the solvent, and uniformly stirring; and 3, sequentially dropwise adding to the surface of the carbon cloth, then heating and preserving heat, and cooling in air after heat preservation. The method is used for preparing the metal atom doped cobaltosic oxide electrolyzed water catalyst.

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 discloses a preparation method and application of a hollow multi-shell metal oxide catalyst, the catalyst is a Pd-CoOx-C spherical catalyst taking a carbon sphere carrier as a substrate, cobalt nitrate as a cobalt source and sodium tetrachloropalladate as a palladium source, and the catalyst is applied to catalytic oxidation of toluene and methyl ethyl ketone. The preparation method of the catalyst comprises the following steps: preparing the uniformly dispersed carbon sphere carrier by using a hydrothermal method; the Pd-CoOx-C spherical catalyst is prepared by taking the carbon sphere carrier as a substrate, cobalt nitrate as a cobalt source, sodium tetrachloropalladate as a palladium source and ethanol as a solvent through a hydrothermal method. Pd-CoOx-C ball solid powder obtained through centrifugation and drying is placed in a muffle furnace to be heated and roasted at different heating rates and subjected to heat preservation, and the hollow multi-shell metal oxide catalyst can be obtained. The hollow multi-shell Pd-Co3O4 catalyst has the characteristics of simple preparation process, low cost, high yield, regular and controllable catalyst morphology and the like. The hollow multi-shell Pd-Co3O4 catalyst prepared by the invention shows excellent catalytic performance on toluene and methyl ethyl ketone oxidation.

The invention relates to a nitrogen-doped carbon shell coated nanoparticle structure catalyst based on beta-cyclodextrin and application of the catalyst in a zinc-air battery, beta-cyclodextrin, urea and cobalt nitrate hexahydrate are directly mixed, beta-cyclodextrin is complexed on the periphery of cobalt through complexation, meanwhile, urea is used as a nitrogen source, and the nitrogen-doped carbon shell coated nanoparticle structure catalyst based on beta-cyclodextrin is prepared. Nitrogen atoms are introduced into beta-cyclodextrin, the morphology of beta-cyclodextrin complexed on the periphery of cobalt is kept after drying, urea is decomposed into a nitrogen source through high-temperature heat treatment, beta-cyclodextrin is partially carbonized to form a conductive carbon matrix, the nitrogen atoms are doped into the carbon matrix, and a nitrogen-doped carbon shell structure with high conductivity is formed. The nitrogen-doped beta-cyclodextrin coated cobalt nanoparticle catalyst with the core-shell structure is obtained, carbonized beta-cyclodextrin provides a conductive network, the electron transfer efficiency is improved, the electron structure of a carbon material is changed by nitrogen doping, the conductivity and the oxidation reduction activity are improved, meanwhile, the introduction of nitrogen atoms is beneficial to increase of the number of active sites, and the nitrogen-doped beta-cyclodextrin coated cobalt nanoparticle catalyst with the core-shell structure is prepared. Therefore, the catalytic activity of the ORR is improved.

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 present invention belongs to the field of functional materials. Provided is a method for preparing a zinc-doped cobalt selenide catalyst. The method for preparing a zinc-doped cobalt selenide catalyst comprises: adding a selenium powder to a potassium hydroxide solution, stirring same until the selenium powder is dissolved, then adding deionized water, cobalt nitrate, zinc nitrate and ethylenediaminetetraacetic acid disodium salt to the resulting solution, continuing stirring, putting the finally obtained solution into a polytetrafluoroethylene reaction kettle for a hydrothermal reaction, and after the reaction is finished, cooling the resulting reaction product to room temperature and then washing, drying and grinding same, so as to obtain a zinc-doped cobalt selenide catalyst. In the method for preparing a zinc-doped cobalt selenide catalyst provided by the present invention, during the preparation process, the raw materials are readily available, the reaction conditions are mild, and a zinc-doped cobalt selenide catalyst can be obtained at a relatively low temperature, all of which are beneficial for reducing the production cost. The zinc-doped cobalt selenide catalyst prepared in the present invention has a unique rod-like structure and good electro-catalytic performance, and the obtained electrocatalyst is non-toxic and harmless, and has wide application prospects.

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 discloses a preparation method of hydrangea-shaped cobalt coordination polymer / cobalt-iron layered double hydroxide nano-enzyme with five-enzyme simulation activity, which mainly comprises the following steps: preparing a Co HNFs (cobalt coordination polymer graded nanoflower) precursor from cobalt nitrate hexahydrate and pyridine-2, 5-dicarboxylic acid in a mixed solution of N, N-dimethylacetamide, methanol and water, and preparing the cobalt coordination polymer / cobalt-iron layered double hydroxide nano-enzyme with five-enzyme simulation activity. CoFe-LDH grows on the surface of the precursor through an etching method, the Co HNFs / CoFe-LDH composite material is prepared, the material is cheap in raw material, the preparation method is simple, the reaction energy consumption is low, the Co HNFs / CoFe-LDH composite material has a good industrial application prospect, and the catalyst has nano-enzymes with five enzyme activities, specifically oxidase, peroxidase and catalase, and has a good application prospect. The five natural enzymes such as superoxide dismutase and laccase have the same enzyme activity.

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 belongs to the technical field of environmental catalytic purification, and discloses a cobalt-titanium composite oxide catalyst and a preparation method and application thereof. The preparation method comprises the following steps: firstly, preparing a precursor solution from tetrabutyl titanate and cobalt nitrate; then, the precursor solution is subjected to sol and gel treatment and then roasted in an air atmosphere or an inert atmosphere, and a cobalt-titanium composite oxide is obtained; and finally, carrying out heating activation treatment on the cobalt-titanium composite oxide in a hydrogen-nitrogen mixed atmosphere, and then carrying out plasma treatment in an argon-nitrogen mixed atmosphere to obtain the cobalt-titanium composite oxide catalyst. The cobalt-titanium composite oxide catalyst has unique oxidation-reduction activity and stability, can efficiently and continuously catalyze and decompose phenols, cyanides and thiocyanides in wastewater under the conditions of low temperature, normal pressure and wide pH range, is easy to regenerate and can be repeatedly used, and has remarkable advantages compared with a traditional catalyst.

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.