3433 results about "Hydrothermal reaction" patented technology

The invention relates to a carbon quantum dot for strengthening and promoting growth of microalgae and application thereof. In the process of preparing the carbon quantum dots by a conventional hydrothermal method, a precursor mixture is subjected to acidification modification in advance, the pH value is adjusted to 2 by using nitric acid, and then a hydrothermal reaction is performed, so that the prepared carbon quantum dots have the capability of promoting the growth of microalgae. However, if other acids are adopted or pH adjustment is not in place, the effect cannot be achieved, and even the inhibition effect can be achieved. The obtained product is good in effect and stable in performance, no special reaction device needs to be additionally arranged in the acidification modification process, and the method has the advantages that operation is easy and convenient, raw materials are easy to obtain, and the process can be quantified; the method is simple and convenient in process operation, has universality and is easy for industrial production.

The invention provides a carbon ceramic resistor and a preparation method thereof, and relates to the technical field of special material production of power systems and electrical equipment. The preparation method comprises the steps that carbon-containing electric conductor raw materials are mixed to obtain a first mixed raw material, and the carbon-containing electric conductor raw materials comprise, by mass, 15 parts of gluconic acid, 10 parts of aluminum oxide and 55 parts of deionized water; performing hydrothermal reaction on the first mixed raw material to obtain a carbon-containing conductor precursor; the carbon-containing conductor precursor is carbonized in a protective atmosphere, a carbon-containing conductor of a core-shell structure is obtained, and the carbon-containing conductor takes aluminum oxide as an inner core and takes a conductive carbon material formed by gluconic acid as a conductive outer shell; mixing the carbon-containing electric conductor with the core-shell structure with a carbon ceramic matrix raw material to obtain a resistor blank; and sintering the resistor blank to obtain the carbon ceramic resistor. The uniformity, the stability and the reliability of the carbon ceramic resistor are improved, so that the carbon ceramic resistor can better meet the application requirements of ultrahigh-voltage and extra-high-voltage alternating-current power transmission systems.

The invention relates to the technical field of biomedical materials, in particular to a titanium implant multifunctional composite coating with anti-active oxygen and anti-inflammatory dual performance and a preparation method of the titanium implant multifunctional composite coating. The coating is composed of a lanthanum oxide (La2O3) nano-particle layer growing on the surface of the titanium implant in situ and queen lily glycoside A (RA) loaded on the lanthanum oxide (La2O3) nano-particle layer and can continuously release La < 3 + > and RA. The preparation method comprises the following steps: performing alkali heat treatment on the titanium substrate; a La (OH) 3 coating is synthesized on the surface in situ through a hydrothermal reaction; the La2O3 nano-particles are calcined and converted into a La2O3 nano-particle layer with a porous structure; and finally loading RA through an impregnation method. The coating can effectively remove ROS, regulate immune inflammatory response, promote osteogenic differentiation and inhibit osteoclast activity, thereby remarkably promoting osseointegration. The problem of osseointegration under the osteoporosis pathological microenvironment is effectively solved, the preparation process is simple and controllable, and the composition is suitable for bone defect repair of osteoporosis patients and has important clinical application value.

The invention discloses a method for preparing a carbon monoxide oxidation catalyst by using red mud and tungsten-molybdenum smelting slag, which comprises the following steps of: uniformly stirring and mixing the red mud and the tungsten-molybdenum smelting slag at a high speed, mixing with inorganic strong acid, and performing ultrasonic-assisted stirring to obtain acid leaching slag; the acid leaching residues are subjected to low-temperature plasma activating treatment and then microwave activating treatment, and microwave activated plasma residues are obtained; weighing tricalcium phosphate and microwave activated plasma slag, and uniformly stirring to obtain phosphorus-calcium doped activated slag; weighing an ammonium sulfide solution and the phosphorus-calcium doped activated slag, uniformly stirring, transferring the obtained sulfur-phosphorus-calcium doped activated slag into a hydrothermal reaction kettle, carrying out hydrothermal reaction, carrying out compression molding on the obtained hydrothermal composite material, and carrying out pyrolysis carbonization treatment in an inert gas atmosphere to obtain the phosphorus-calcium doped activated slag. The obtained pyrolysis composite material is soaked with a silane coupling agent solution and then roasted again, and the carbon monoxide oxidation catalyst is obtained. The catalyst prepared by the invention can realize efficient oxidation photocatalysis of carbon monoxide under the conditions of normal temperature and normal pressure.

The invention discloses a method for preparing a carbon monoxide oxidation catalyst by using titanium gypsum and a waste hydrogenation catalyst, which comprises the following steps: crushing and pickling the waste hydrogenation catalyst, washing with clear water until the waste hydrogenation catalyst is neutral, and drying to obtain pretreated waste catalytic powder; uniformly mixing and stirring titanium gypsum and the pretreated waste catalytic powder to obtain gypsum doped pretreated waste catalytic powder; mixing a plant extract, crop powder and gypsum, doping the pretreated waste catalytic powder, uniformly stirring, feeding into mixed bacteria consisting of bacillus and aspergillus, and fermenting under a stirring condition to obtain a biological activated mixture; adding water into the biological activation mixture for hydrothermal reaction, filtering, separating and washing the material after the hydrothermal reaction is finished, roasting the washed filter cake, naturally cooling the roasted material, and crushing to obtain the carbon monoxide oxidation catalyst. According to the invention, the titanium gypsum and the waste hydrogenation catalyst are combined, and the biomass material is used for activating treatment, so that the use of chemical precursors is reduced, and the oxidation catalyst with excellent catalytic performance is obtained.

The invention discloses a photocatalytic material with a baseball-shaped structure as well as a preparation method and application of the photocatalytic material, and belongs to the technical field of photocatalytic synthesis of ammonia. The invention discloses a photocatalytic material with a baseball-shaped structure. The photocatalytic material comprises FeMOF with a rod-shaped structure and MnMOF with a spherical structure, the photocatalytic material with the baseball-shaped structure takes FeMOF with a rod-shaped structure as a substrate, and MnMOF with a spherical structure grows on the FeMOF with the rod-shaped structure; and the MnMOF with the spherical structure contains acetate ions. The preparation method comprises the following steps: dissolving an iron source and a manganese source in a solvent, adding an organic ligand, carrying out ultrasonic treatment, and carrying out a hydrothermal reaction; the manganese source is manganese acetate tetrahydrate. According to the photocatalytic material with the baseball-shaped structure, MnMOF with the spherical structure uniformly grows on FeMOF with the rod-shaped structure to form an electron and hole conversion channel, so that the electron and hole transmission rate is enhanced, the photocatalytic performance of the bimetal organic framework structure is enhanced, and the yield of photocatalytic synthesis ammonia is remarkably improved.

The invention discloses a preparation method of CoWO (cobalt tungsten oxide) modified NbOp-n heterojunction NbO5 / CoWO photocatalyst powder. The preparation method comprises the following steps: dissolving cobalt salt and tungsten salt in deionized water, stirring and mixing, carrying out hydrothermal reaction in an autoclave, washing and drying to obtain CoWO powder; the preparation method comprises the following steps: dissolving niobium oxalate and ammonium carbonate in deionized water, adding CoWO powder, carrying out a hydrothermal reaction in an autoclave, and carrying out washing and drying treatment to prepare NbO / CoWO photocatalyst powder. According to the method, the hydrothermal reaction temperature is regulated and controlled, and the mass ratio of raw materials is optimized, so that the catalyst forms a p-n heterojunction structure of NbOmicron flower loaded CoWOnano particles. The prepared catalyst has high norfloxacin wastewater degradation efficiency under visible light irradiation, has the advantages of simple preparation process, low reagent cost, high catalytic activity and good structural stability, and can be effectively applied to purification treatment of antibiotic polluted water.

The invention relates to the technical field of electro-catalysis oxygen evolution, and particularly discloses a nickel-molybdenum foam composite oxygen evolution electro-catalysis material with high-valence nickel induced by molybdate radicals and a preparation method of the nickel-molybdenum foam composite oxygen evolution electro-catalysis material aiming at the problem that an existing oxygen evolution electro-catalysis material is insufficient in comprehensive performance or poor in performance stability. Soaking in a NaCl aqueous solution, and taking out; s2, mixing the nickel-molybdenum alloy foam with a K3 [Fe (CN) 6] aqueous solution, heating, and carrying out a hydrothermal reaction; and S3, finally, the nickel-molybdenum alloy foam is placed in the air or oxygen atmosphere and heated to 350-450 DEG C, heat preservation treatment is conducted for 2 h, and the nickel-molybdenum foam composite oxygen evolution electro-catalysis material is obtained. Molybdate anions are adopted as a sustainable induction source to be coupled with a NixOy / Fe3O4 heterogeneous interface, integrated construction is achieved on a nickel-molybdenum foam framework, and the nickel-molybdenum foam composite material has the advantages of being low in overpotential, high in stability, high in activity, high in binding force and long-term in durability and meanwhile being simple in process, easy to amplify on a large scale and the like.

The invention discloses a co-processing method for multi-source lithium battery solid waste. The method comprises the following steps: S1, putting the waste lithium battery recovery wastewater, black powder and a certain amount of acid into a hydrothermal reaction kettle, sealing, and introducing oxygen or air into the hydrothermal reaction kettle; s2, raising the temperature of the hydrothermal reaction kettle to 180-250 DEG C, and carrying out constant-temperature reaction for 0.5-3 hours; s3, after the reaction is finished, cooling to room temperature, and separating a reaction product to obtain filtrate and filter residues. According to the cooperative treatment method, high-efficiency treatment of difficult-to-treat salt-containing organic wastewater and selective extraction of lithium in the battery black powder are synchronously realized.

The invention relates to the technical field of agricultural application of nano materials, and discloses a preparation method and application of a photosynthetic accelerant containing carbon quantum dots. Urea and citric acid are adopted as raw materials, and the nitrogen-carbon molar ratio and hydrothermal reaction parameters are optimized, so that efficient doping of nitrogen and accurate regulation and control of the particle size are achieved, and the photosynthetic accelerant containing the carbon quantum dots is obtained. The nitrogen-doped carbon quantum dot photosynthetic promoter with excellent upconversion performance is successfully synthesized, the promoter has good water solubility and biocompatibility, the photosynthetic efficiency of plants can be greatly improved within the concentration range of 0-100 mg / L, a safe application window is defined, and by establishing foliage spraying and water planting dual-mode application specifications, the application range of the nitrogen-doped carbon quantum dot photosynthetic promoter is widened, and the application range of the nitrogen-doped carbon quantum dot photosynthetic promoter is widened. The problems that current crops are insufficient in solar spectrum utilization and low in light energy conversion efficiency are solved in a targeted manner by utilizing an ultraviolet light-photosynthetically active radiation conversion function mediated by the carbon quantum dots and combining the targeted enrichment permeation characteristic of the carbon quantum dots in chloroplast.

The invention discloses a method for preparing a carbon monoxide normal-temperature oxidation catalyst based on electrolytic manganese residues and landfill leachate. The method comprises the following steps: soaking and purifying the electrolytic manganese residues with deionized water to obtain preliminarily purified electrolytic manganese residues; mixing aryl alcohol dehydrogenase, the preliminarily purified electrolytic manganese residues and the landfill leachate, and standing to obtain enzymolysis electrolytic manganese residue slurry; mixing fly ash, red mud and the enzymolysis electrolytic manganese slag slurry, uniformly stirring, drying and grinding to obtain a multi-component composite raw material; placing the multi-component composite raw material in low-temperature plasma equipment for irradiation to obtain a plasma activated composite material; and carrying out hydrothermal reaction on the plasma activated composite material to obtain a hydrothermal structure composite material, dipping the hydrothermal structure composite material in a solution containing cerium nitrate, drying, and roasting to obtain the carbon monoxide normal-temperature oxidation catalyst. The carbon monoxide normal-temperature oxidation catalyst with high activity and high moisture resistance is prepared by utilizing industrial wastes and landfill leachate enzymolysis derivative liquid.

The invention provides high-performance silver powder suitable for TOPCon battery fine grid silver paste, a preparation method of the high-performance silver powder and the silver paste, and belongs to the technical field of photovoltaic materials. The preparation method comprises the steps that a silver salt solution and a composite reducing agent are mixed, a first-stage hydrothermal reaction is carried out at the first temperature, a second-stage hydrothermal reaction is carried out at the second temperature, and silver powder is obtained after centrifugation, washing and drying; wherein the composite reducing agent is selected from a mixture of two of potassium tartrate, sodium sulfite and ferrous sulfate. According to the method, gradual growth and crystallinity improvement of silver crystal nucleuses are achieved through two-stage heating, particle aggregation or uneven morphology caused by rapid reduction is avoided, in addition, the adopted composite reducing agent combination is remarkably superior to a single reducing agent (such as ascorbic acid), and the morphology and particle size distribution of the silver powder can be more accurately regulated and controlled.

The invention discloses a preparation method and application of a biomass-based hard carbon negative electrode material based on a microwave solvothermal method, and the preparation method comprises the following steps: fully mixing a pretreated biomass carbon source with a sulfuric acid solution, transferring into a microwave hydrothermal reaction kettle, and carrying out microwave hydrothermal treatment to obtain a hydrothermal reaction product; carrying out solid-liquid separation on a hydrothermal reaction product, collecting filter residues, cleaning until filtrate is neutral, and drying to obtain a hard carbon precursor; performing high-temperature carbonization on the hard carbon precursor under the protection of an inert atmosphere to obtain the biomass-based hard carbon negative electrode material; according to the method, a mixed system of the biomass carbon source and sulfuric acid is pre-carbonized in a microwave solvothermal mode, uniform deliming of the biomass carbon source is achieved under the controllable acidity condition, and the uniformity of the biomass carbon source is improved; the pre-carbonized biomass material is subjected to high-temperature carbonization in an inert atmosphere, so that a hard carbon material with a moderate extension interlayer spacing can be obtained, and the synergistic improvement of high-rate charge-discharge performance and long cycle stability is realized.

The invention discloses a self-lubricating aluminum coating and a preparation method thereof.The preparation method comprises the steps that molybdenum disulfide is pretreated through a silane coupling agent, tetraethoxysilane mixed liquor is added, the pH is adjusted to be 9-10, a water bath reaction is conducted, and molybdenum disulfide-silicon dioxide microcapsules are obtained after high-temperature strengthening treatment; respectively adding a zinc nitrate solution and a hexamethylenetetramine solution, adjusting the pH value to 10-11, carrying out a high-temperature and high-pressure hydrothermal reaction to obtain zinc oxide nanorods, and carrying out ball milling treatment on the zinc oxide nanorods, microcapsules, stearic acid and zirconium oxide balls under the protection of argon to obtain doped microcapsules; after raw materials are pretreated, the raw materials and a dispersing agent solution are added into a mixer respectively, spraying powder, a pretreated base body and the spraying powder are obtained after mixing treatment, spraying treatment is conducted on the surface of the base body through a plasma spraying method, and the self-lubricating aluminum coating is obtained after vacuum annealing treatment. Therefore, the obtained self-lubricating aluminum coating is low in friction coefficient, high in performance and excellent in self-lubricating property.

The invention provides a preparation method for preparing porous carbon based on an aerogel method, the porous carbon and application of the porous carbon, and belongs to the technical field of porous carbon material preparation. The preparation method comprises the following steps: mixing polyhydroxy phenol, aromatic aldehyde, acrylamide, graphene oxide and lithium salt according to a mass ratio of 100: (50-200): (5-30): (1-5): (1-5), carrying out hydrothermal reaction at 100-200 DEG C for 1-6 hours, and freeze-drying at-40 DEG C to obtain a hydrogel precursor; and carbonizing the precursor in organic heteroatom gas at 500-800 DEG C, mixing the intermediate with alkali according to the ratio of 100: (100-500), activating at 900-1100 DEG C, pickling and drying to obtain the porous carbon. The conductivity of the product is improved by means of graphene, lithium salt and heteroatoms, and the aerogel method obtains large aperture, has the characteristics of low impedance, high first efficiency and small charge-discharge expansion, and can be efficiently applied to silicon-carbon materials.

The invention relates to the technical field of environmental protection, and discloses a method for degrading formamide organic wastewater and recycling key metals of a retired lithium ion battery. The method comprises the following steps: S1, obtaining the positive electrode material of the retired lithium ion battery, mixing the positive electrode material with formamide organic wastewater, and carrying out hydrothermal reaction to obtain a leachate; s2, adjusting the pH value of the leachate to 6-14, and carrying out a transition metal precipitation reaction to obtain a transition metal hydroxide precursor and a lithium-rich filtrate; and S3, adding a sodium carbonate solution into the lithium-rich filtrate, carrying out a precipitation reaction, and collecting lithium carbonate. The formamide organic wastewater serves as an endogenous reducing agent, deep degradation of the formamide organic wastewater is achieved under the hydrothermal condition, efficient leaching of key metal in the retired lithium ion battery is achieved, and waste is treated with waste; the formamide degradation efficiency can reach 90% or above, and the defects that an existing formamide wastewater treatment method is high in energy consumption, large in reagent consumption, high in cost, low in degradation efficiency and large in environmental treatment pressure are overcome.

The invention relates to the technical field of sodium ion batteries, and discloses plant tar phenolic resin in-situ modified asphalt and a method for preparing a hard carbon material by using the plant tar phenolic resin in-situ modified asphalt. The preparation process of the method comprises the following steps: (1) mixing and dispersing; (2) carrying out hydrothermal polymerization; and (3) high-temperature carbonization. The plant tar is used as a raw material, low-cost phenolic resin is prepared through a hydrothermal reaction, asphalt molecules are doped in situ in the synthesis process, the asphalt molecules participate in the cross-linking process, a more complex mixed polymer is formed, the graphitization process in the high-temperature carbonization process is inhibited, and the high-performance phenolic resin is prepared. And finally, the sodium ion battery negative electrode hard carbon material with excellent sodium storage capacity and good cycle performance is prepared. The raw materials are wide in source, the production cost of the hard carbon material is remarkably reduced, the method has a wide mass production prospect, and an economical and efficient technical scheme is provided for industrial application of the hard carbon material.

The invention belongs to the technical field of preparation and application of nano materials, and relates to a preparation method and application of amino-functionalized cerium oxide nano enzyme, and the preparation method comprises the following steps: adding 3-aminophenylboronic acid into a cerous nitrate hexahydrate aqueous solution to obtain a mixed solution; dropwise adding a sodium hydroxide aqueous solution into the mixed solution, carrying out hydrothermal reaction, cooling after the reaction is finished, centrifuging, washing and drying to obtain milk white powder, namely the amino-functionalized cerium oxide nano-enzyme. The boron element is introduced in the preparation of the cerium oxide nano-enzyme, and the amino-functionalized cerium oxide nano-enzyme is prepared by adopting a simple one-step hydrothermal synthesis method, so that the nano-enzyme has good phosphatase-like activity, has high selectivity and sensitivity to LPS, and is short in detection time, high in sensitivity, low in detection limit, simple in preparation process and high in preparation efficiency; the product is good in quality, high in stability, environment-friendly and extremely wide in market prospect.

The invention provides a gas sensor and a method for preparing the gas sensor through laser direct writing. The method comprises the following steps: enabling a metal electrode to be in contact with laser direct writing ink, wherein the laser direct writing ink comprises a nickel source, a porous structure guiding agent and a solvent; laser irradiates a specified contact area of the metal electrode and the laser direct-writing ink, so that the metal electrode absorbs the laser to generate heat so as to form a hydrothermal reaction area in the specified contact area, and the laser direct-writing ink in the hydrothermal reaction area is subjected to a hydrothermal reaction, so that porous nickel hydroxide grows on the metal electrode, and a precursor structure is obtained; and carrying out annealing treatment on the precursor structure so as to convert the porous nickel hydroxide into porous nickel oxide, thereby obtaining the gas sensor. The gas sensor provided by the invention has the porous nickel oxide which has a relatively large specific surface area, so that the effective contact area between the gas sensor and target gas can be increased, and the gas responsivity of the gas sensor is improved.

The invention discloses modified biogas residue-based hydrothermal carbon, a preparation method thereof and a dry digestion method for kitchen waste, and belongs to the technical field of waste organic matter recycling. The preparation method comprises the following steps: soaking biogas residues in a phosphoric acid solution to obtain pretreated biogas residues; mixing the pretreated biogas residues, transition metal salt, biochar loaded with vitamin B12 and water with the mass being 8-15 times that of the pretreated biogas residues, and performing hydrothermal reaction for 1-4 hours under the conditions that the temperature is 180-250 DEG C and the pressure is 1.5-4 MPa to obtain a hydrothermal product; and activating the hydrothermal product for 1-2 hours under the protective atmosphere of 300-400 DEG C to obtain the modified biogas residue-based hydrothermal carbon. The surface Fe-Cu composite oxide sequentially catalyzes and oxidizes H2S into elemental sulfur and sulfate ions, the vitamin B12-loaded biochar can promote MA directional proliferation, the sulfate ions can competitively inhibit SRB substrate uptake, the quantity ratio of MA to SRB is increased, and the methane production efficiency is effectively improved.

The invention discloses a preparation method of a metal doped type hydroxyapatite nanoflower. The method specifically comprises the following steps: dispersing a calcium source and soluble metal salt into water, adding acid phosphate, urea and L-histidine, uniformly mixing, carrying out a hydrothermal reaction, mechanically stirring, filtering, washing, and drying a hydrothermal system precipitate to obtain the corresponding metal-doped hydroxyapatite nanoflower. Compared with the prior art, the metal-doped hydroxyapatite nanoflower prepared by the preparation method disclosed by the invention is directly assembled by nanosheets, and a single metal type can be doped in a customized manner. According to the method, water is used as a unique solvent, the use of an organic solvent is avoided, the pH does not need to be adjusted in advance, the technological process is simple, operation is convenient, equipment investment is small, and the method is suitable for industrial production.

The application provides a preparation method of a self-coiled structure molybdenum disulfide / nitrogen-doped porous carbon composite material, a product and application, high-content nitrogen-doped porous carbon material is synthesized by inducing dicyandiamide molecules to undergo a supramolecular self-assembly process, and on this basis, a hydrothermal reaction is carried out to coat molybdenum sulfide sheet layer material on the surface, and finally, a self-heating coiling treatment is carried out to form a carbon-based electrocatalyst of the self-coiled structure molybdenum disulfide / nitrogen-doped porous carbon. Compared with a high specific surface area carbon-based catalyst, high doping concentration of nitrogen atoms can provide more electron-rich properties to facilitate the adsorption of substances, and the self-coiled carbon-based material can exhibit very excellent electrochemical performance, especially in the aspect of electrochemical hydrogen production. The preparation method is simple in operation, low in preparation cost and suitable for large-scale production.

The present application belongs to the technical field of nanometer material, and discloses a kind of sheet porous nanometer zinc oxide and its preparation method and application.The present application first prepares basic zinc carbonate precursor, then nitrogen is passed into, the pressure of system is >0.4MPa and <0.6MPa, hydrothermal reaction is carried out, and the reaction product is calcined, and sheet porous nanometer zinc oxide is prepared.The sheet porous nanometer zinc oxide prepared by the method of the present application has uniform and regular sheet porous structure, the holes on the sheet are uniform and regular, dense, small in particle size, large in specific surface area, and can be widely applied in the degradation of organic pollutants in photocatalytic system and the field of heavy metal adsorption.The preparation method of the present application can obtain raw materials easily and can be mass-produced.

The application relates to the technical field of composite materials, and particularly discloses a carbon fiber / epoxy electromagnetic shielding composite material with strong interface bonding and a preparation method thereof, which comprises the following steps: hydrothermal reaction of oxidized carbon fibers O-CF, an organic ligand and an iron source in a solvent, washing and drying of the fibers to obtain MIL-loaded carbon fibers, carbonization treatment to obtain iron-based oxide-loaded carbon fibers dF@CF, vacuum-assisted introduction of epoxy resin into the multilayer carbon fibers dF@CF, and curing to obtain the carbon fiber / epoxy electromagnetic shielding composite material. The organic ligand and trivalent iron ions are used to synthesize a large number of rhombic MILs on the active sites on the surface of the carbon fibers, the MILs are reduced into iron-based oxide nanoparticles after carbonization, the iron-based oxide nanoparticles are closely loaded on the surface of the carbon fibers, the interface bonding performance is improved, the electromagnetic shielding efficiency is increased, and the carbon fiber / epoxy composite material with both the interface and the electromagnetic shielding efficiency is realized.

The invention relates to a preparation method of a ZIF-67 derived cobalt-manganese catalyst and application of the ZIF-67 derived cobalt-manganese catalyst in catalytic oxidation of benzene, and belongs to the technical field of catalyst preparation. The preparation method comprises the following steps: preparing a ZIF-67 precursor; dispersing ZIF-67 in water to form a turbid liquid, and adding a potassium permanganate aqueous solution to carry out an etching reaction to obtain a mixed system; transferring the mixed system into a reaction kettle for hydrothermal reaction to obtain a black precipitate; and washing the black precipitate, drying, roasting, and grinding to obtain the ZIF-67 derived cobalt-manganese catalyst. According to the preparation method, the problem that residues are usually easy to remain in the conventional preparation method of the ZIF-67 catalyst is solved, and the Co-Mn8-T140 catalyst prepared by the preparation method disclosed by the invention can realize 90% of benzene conversion rate at the reaction temperature of about 210 DEG C under the reaction conditions that the air speed is up to 60000mL / (g.h), the benzene concentration is 1000ppm and the oxygen content is 20%.

The invention discloses a method for regenerating and preparing high-voltage lithium cobalt oxide by using an invalid lithium cobalt oxide material, and belongs to the technical field of battery recovery. The method comprises the following steps: S1, carrying out ball milling and mixing on failed lithium cobalt oxide powder and a sodium source, and then carrying out solid-phase sintering to obtain a P2 type sodium cobalt oxide and lithium cobalt oxide material; s2, the P2 type sodium cobaltate and lithium cobaltate material is placed in a lithium-containing solution for a hydrothermal reaction, a regenerated O2-O3 cotype lithium cobaltate material is obtained, the regenerated O2-O3 cotype lithium cobaltate material has the advantages of being good in cycling stability, high in rate capability, high in low-temperature performance and the like under the high voltage of 4.6 V, and the performance of the regenerated O2-O3 cotype lithium cobaltate material is superior to that of a commercial lithium cobaltate material.

The invention discloses a preparation method and application of a bimetallic sulfide / three-dimensional porous carbon catalyst, and relates to the technical field of electrolyzed water catalysts.The preparation method comprises the following steps that melamine sponge is cleaned, and the clean melamine sponge is obtained; the preparation method comprises the following steps: dissolving metal salt 1 and metal salt 2 in an ethanol aqueous solution, and adding alkali and an aniline monomer to obtain a precursor solution; completely soaking the clean melamine sponge in a precursor solution, carrying out constant-temperature hydrothermal reaction, and sequentially washing and drying to obtain the melamine sponge anchored with bimetal ions; introducing inert gas for protection, and performing high-temperature vulcanization treatment to obtain the three-dimensional porous carbon catalyst embedded with the bimetallic sulfide heterostructure. The catalyst comprises uniformly dispersed bimetallic sulfide nanoparticles and a spongy three-dimensional porous carbon carrier, shows excellent bifunctional catalytic activity and stability when being applied to an electro-catalytic water decomposition reaction, and has a wide application prospect.

The invention relates to a platinum-zinc alloy supported nitrogen-doped porous multi-layer carbon material and preparation and application thereof, the carbon material takes a rod-like graded porous carbon nanomaterial as a carrier, and platinum-zinc alloy particles and zinc monatomic are jointly supported on the surface of the carrier; the preparation method comprises the following steps: S1, adding zinc acetate and hexadecyl trimethyl ammonium bromide into DMF (Dimethyl Formamide), carrying out ultrasonic treatment, adding into a polyacrylonitrile solution, and stirring; s2, performing electrostatic spinning on the obtained spinning precursor solution; s3, adding the obtained nanofiber into a zinc acetate dihydrate solution, then adding a dimethylimidazole solution, carrying out hydrothermal reaction, soaking the obtained product in a chloroplatinic acid methanol solution, and then carrying out freeze drying; and S4, heating carbonization is carried out under the protection of an inert atmosphere, then annealing and cooling are carried out, and the PtZn-Zn-N4-HPCNFs material is obtained. Compared with the prior art, the catalytic performance and the like in the reaction processes of oxygen reduction reaction (ORR), chlorine evolution reaction (CER) and the like can be effectively improved.

The invention discloses a double-morphology boron-containing Zn / Cu metal organic framework composite material as well as preparation and application thereof, and belongs to the technical field of fine chemical engineering. The double-morphology boron-containing Zn / Cu metal organic framework composite material is prepared through a one-pot hydrothermal reaction, and the double morphology comprises a three-dimensional nanoflower structure and a three-dimensional rod / columnar structure. Specifically, by adjusting the molar ratio of Zn to Cu in the coordination process with corresponding ligands, when the molar ratio of Zn to Cu reaches 1: 1, the original single nanoflower structure can generate a new three-dimensional rod / columnar structure, so that two composite forms are formed. The double-morphology boron-containing Zn / Cu metal organic framework composite material shows high activity and high selectivity when being used for two key reactions of electrochemical hydrogenation reduction and electrochemical oxidation of furfural.

The invention discloses preparation and application of a millimeter-scale high-uniformity bastnaesite single crystal electron probe standard sample, and the preparation method comprises the following steps: taking CeF3 and carbonate as raw materials, carrying out solid phase mixing, carrying out a hydrothermal reaction at 400-500 DEG C under water self-generated saturated vapor pressure, and carrying out programmed cooling, washing and drying to obtain a CeCO3F single crystal which has a millimeter-scale size and does not contain Nd and other rare earth impurities. The spectrum peak overlapping interference in EPMA analysis is eliminated from the source, the internal elements are highly uniformly distributed, and the relative standard deviation (RSD) of the distribution of the key element Ce is less than 1.0%. The method is simple in process, low in cost and mild in condition, the limitation that millimeter-level single crystals are difficult to prepare through a traditional method is broken through, and the obtained single crystal standard sample has the advantages of being high in crystallinity, good in stability, high in matching degree with a natural geological sample matrix and the like, is suitable for electron probe analysis, especially high-precision quantitative analysis of rare earth element Ce and has good application prospects. And the accuracy and reliability of an analysis result can be effectively improved.