397 results about "Cobalt ions" patented technology

The invention provides a precipitation method of a heavy metal solution. Cations in the heavy metal solution comprise nickel ions, cobalt ions, copper ions, zinc ions and manganese ions, and the precipitation method comprises the following steps: step S100, carrying out a manganese conversion reaction on an alkaline substance by adopting a solution containing manganese ions to obtain a converted manganese precipitate; s200, a stabilizing agent is adopted for carrying out a stabilizing reaction on the converted manganese precipitate, and a stable manganese precipitate is obtained; step S300, adding the stable manganese precipitate into a heavy metal solution for precipitation reaction to obtain precipitate slurry; step S400, continuously carrying out solid-liquid separation on the precipitate slurry to obtain a heavy metal precipitate and a manganese-containing solution; and S500, raw materials including the manganese-containing solution, an oxidizing agent and alkali liquor are subjected to an oxidation precipitation reaction, and a post-precipitation solution and a manganese product are obtained. The method solves the problems of poor sedimentation and filtration performance of a precipitation product, high moisture content of the precipitation product and low precipitation efficiency when heavy metals are precipitated in the heavy metal solution.

The invention belongs to the technical field of electrocatalyst material preparation, and discloses a long-range disordered localized CoOOH ultrathin nanosheet electrocatalyst as well as a preparation method and application thereof, fluorine-doped cobalt selenide nanobelts prepared by a low-temperature annealing method are used as a base material, and the CoOOH ultrathin nanosheet electrocatalyst is prepared by in-situ reconstruction under an alkaline electrolyzed water anode oxygen evolution reaction condition. In the preparation process of the CoOOH ultrathin nanosheet provided by the invention, lattice cobalt is stabilized in the water electrolysis anode reconstruction process through fluorine ions with strong bonding action with cobalt ions, so that the long-range disordered structure of amorphous CoOOH generated after reconstruction is limited by localization, and the alkaline water electrolysis anode reaction performance is improved. The catalyst has activity and durability obviously superior to those of a commercial ruthenium oxide catalyst in industrial application of anion exchange membrane water electrolysis hydrogen production.

To provide a positive electrode active material for a lithium ion secondary battery, having high capacity and being excellent in charging and discharging cycle characteristic.SOLUTION: A positive electrode active material contains lithium, cobalt, nickel, aluminum, and oxygen. The spin density due to any one or more of divalent nickel ions, trivalent nickel ions, divalent cobalt ions, and tetravalent cobalt ions is in a predetermined range. The positive electrode active material further contains magnesium. The suitable magnesium concentration is expressed by the concentration relative to cobalt. The positive electrode active material preferably contains fluorine additionally.SELECTED DRAWING: Figure 1

The invention discloses a method for preparing cyclohexylamine based on reductive amination of cyclohexanone, and belongs to the technical field of fine chemical engineering. The preparation method comprises the following steps: adding a reactant cyclohexanone into a reaction kettle containing a certain amount of solvent, ammonia water and hydrogen atmosphere, and carrying out reductive amination reaction in the presence of a catalyst to obtain cyclohexylamine. The catalyst is CoyAl-LDHs loaded with metal active components, the CoyAl-LDHs are layered cobalt-aluminum bimetal hydroxides, and cobalt ions and precious metal ions in laminates are subjected to spontaneous oxidation-reduction reaction, so that the precious metal ions can be efficiently reduced into active metal nanoparticles. The layered cobalt-aluminum double-metal hydroxide not only has abundant surface acid-base sites, but also has high dispersity of loaded metal nanoparticles. The catalyst preparation and reductive amination reaction conditions are mild, the yield is high, the reaction system is simple and easy to separate, and the method is suitable for industrial production of cyclohexylamine.

The invention discloses a Cb Ago-based TdT detection reagent and a Cb Ago-based TdT detection method. The TdT detection reagent comprises a TdT extension reaction system and a TdT detection system, wherein the TdT extension reaction system comprises a TdT reaction buffer solution, deoxythymidine triphosphate, cobalt ions and an extension reaction detection probe; the Cb Ago system comprises Cb Ago, a Cb Ago buffer solution and a fluorescence report probe. The extension reaction detection probe disclosed by the invention can extend under the action of TdT, and then is in specific complementary pairing with the fluorescent reporter probe to activate Cb Ago to cut the fluorescent reporter probe, so that TdT detection is realized. The high specificity of the TdT extension reaction and the signal amplification capacity of Cb Ago are combined, and the method has the advantages of being easy and convenient to operate, high in sensitivity, low in cost, suitable for on-site detection and the like and is expected to become a powerful tool for detecting TdT.

The invention belongs to the technical field of catalytic materials and hydrocarbon reforming, and particularly relates to a high-entropy catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a metal salt solution containing lanthanum, chromium, copper, zinc, manganese, nickel, iron and cobalt ions with a chelating agent and a dispersing agent for reaction, carrying out ultrasonic cavitation treatment to obtain sol, adjusting the pH value, gelatinizing under an oil bath heating condition to obtain a colloidal precursor, drying, and calcining in an air atmosphere to obtain a perovskite type high-entropy oxide precursor; and then treating in a reducing atmosphere to obtain the FeZnCuNiCo perovskite type high-entropy alloy catalyst which contains metal components of La, Cr, Ni, Mn, Fe, Zn, Cu and Co and takes a multi-metal alloy active center of Fe-Zn-Cu-Ni-Co as a main component. The high-entropy catalyst can meet the harsh requirements of high temperature, strong carbon deposition driving force and long-period operation in a propane dry reforming reaction, and is suitable for industrial application scenarios of continuous production of high-temperature synthesis gas.

The invention discloses a phase transfer catalyst of metal ion complexing crown ether for efficiently preparing aquacide dichloride and application of the phase transfer catalyst. The catalyst is prepared by taking crown ethers as 18-crown-6 and dicyclohexyl-18-crown-6 ether and complex ions as lewis acid active components such as potassium ions, lithium ions, cobalt ions, copper ions and the like through a direct chemical method. The catalyst synergistically catalyzes a nucleophilic substitution reaction of a pyridine derivative and alkyl halide in an aprotic polar solvent such as acetonitrile or nitrobenzene, and synthesis of diquat dichloride can be realized under the conditions of 60-140 DEG C, normal pressure and no oxygen. The mass ratio of the pyridine derivative to the catalyst to the solvent in a reaction system is 1: (0.001-0.05): (5-8), and real-time monitoring and regulation are performed through an online infrared spectrum, a liquid chromatograph and a gas chromatograph-mass spectrometer. The purity of the product is more than 99% after the product is subjected to filtration, recrystallization with an ethanol-water mixed solvent and vacuum drying. The catalyst provided by the invention has the characteristics of high activity, strong stability and recoverability, obviously improves the atom economy of the reaction, simplifies the production process, reduces the energy consumption and pollution, and is suitable for large-scale industrial production.

The invention discloses an extracting agent for extracting and separating nickel cobalt and lithium magnesium, which relates to the technical field of extracting agents and is a composite extracting agent consisting of an extracting agent A and a synergistic extracting agent B, the extraction agent A is tertiary carbon carboxylic acid and salt thereof, the synergistic extraction agent B is composed of a synergistic extraction agent a and a synergistic extraction agent b, the synergistic extraction agent a is naphthalene sulfonic acid and salt thereof, and the synergistic extraction agent b is alcohol R5OH. The invention provides a synergistic extraction system of nickel and cobalt. Tertiary-carbon carboxylic acid with the carbon atom number of 10-20, tertiary-carbon sulfonic acid with the carbon atom number of 10-20 and fatty alcohol with the carbon atom number of 8-16 cooperate with each other. The tertiary carbon carboxylic acid, the tertiary carbon sulfonic acid and the fatty alcohol are matched, so that the tertiary carbon carboxylic acid, the tertiary carbon sulfonic acid and the fatty alcohol have very good selectivity and relatively strong extraction capacity on nickel ions and cobalt ions; and the defects that the water solubility of an existing extraction system is high and strong acid enters a water phase when the strong acid is used for reverse extraction are effectively overcome.

The invention discloses a Co / Mxene composite catalyst for oxygen reduction catalysis as well as a preparation method and application of the Co / Mxene composite catalyst. Belongs to the technical field of metal-air cell and fuel cell catalysts, clusters containing cobalt salt and ligands are easily adsorbed by Mxene nanosheets by utilizing amphipathicity and complexing action on cobalt ions of organic small molecule ligands, and under the inhibition of Mxene surface functional groups, the cobalt ions in the Mxene nanosheets are adsorbed by the Mxene nanosheets, so that the cobalt ions in the Mxene nanosheets are adsorbed by the Mxene nanosheets. The small particles cannot be further agglomerated in the calcining process of the inert atmosphere, so that the cobalt nanoparticles can be synthesized on the high-conductivity Mxene nanosheet substrate. The catalyst has efficient and stable oxygen reduction performance on the premise of maintaining high conductivity of Mxene; the cobalt content is low, and low-cost preparation can be achieved; the specific surface area is relatively large, and cobalt nanoparticles are uniformly distributed on the surface of Mxene; the catalyst has excellent conductivity, can be applied to membrane electrodes of zinc-air cells, aluminum-air cells and fuel cells, and provides an efficient and stable catalyst.

The invention provides a method for recycling battery-grade manganese sulfate from manganese-containing feed liquid. The method comprises the following steps: (1) carrying out resin adsorption on a manganese-containing feed liquid to obtain a nickel-cobalt adsorbate and an adsorbed feed liquid; (2) sequentially carrying out extraction treatment and reverse extraction treatment on the adsorbed feed liquid to obtain a solution containing manganese sulfate and an organic phase after reverse extraction; (3) carrying out evaporative crystallization on the solution containing manganese sulfate to obtain battery-grade manganese sulfate; positive ions in the manganese-containing feed liquid comprise manganese ions, nickel ions, cobalt ions, calcium ions and magnesium ions, and negative ions in the manganese-containing feed liquid comprise sulfate ions; an extraction agent adopted in the extraction treatment process comprises an HBL116 extraction agent. According to the method disclosed by the invention, metal oxidation hydrolysis cannot be caused to generate a third phase, the extraction process is stable, enrichment of a high-concentration manganese sulfate solution is realized, high-purity manganese sulfate crystals with qualified impurities are obtained, and efficient recovery of manganese in a high-calcium-magnesium feed liquid system can be realized; and a complicated recovery process is not needed, so that the cost is lower.

The invention relates to a coprecipitation method for preparing cobaltosic oxide, which comprises the following steps: mixing a cobalt salt solution, a precipitant solution and a complexing agent solution in a carbonate base solution in a parallel flow manner, and carrying out first coprecipitation reaction to a first particle size to obtain a seed crystal; the cobalt salt solution, the precipitant solution and the complexing agent solution are mixed in a parallel flow mode, a second coprecipitation reaction is conducted, and cobalt carbonate powder is obtained; calcining the cobalt carbonate powder to obtain cobaltosic oxide with a median particle size D50 of 18-20 [mu] m; a complexing agent in the complexing agent solution is iminodiacetic acid. According to the invention, by using the specific complexing agent, cobalt ions exist in the system in the form of complex ions and are slowly released in the reaction process, so that the first coprecipitation reaction can be carried out orderly, and the cobaltosic oxide with the median particle size D50 of 18-20 [mu] m can be obtained.

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

The application discloses a preparation method of graphene aerogel and application thereof, and the graphene aerogel is prepared from a three-dimensional network of graphene oxide as a continuous matrix, hydrophilic polyimide fibers as a reinforcing framework, and metal-organic coordination bonds as functional nodes by coordinating cobalt ions with ethylenediamine tetramethylene phosphonic acid, and is prepared through a hydrothermal reaction, freeze drying and high-temperature annealing; the preparation method is simple, the process is easy to control, the electromagnetic shielding performance of the prepared graphene aerogel reaches 48 dB, and the graphene aerogel has good mechanical stability in the range of-75 to 150 DEG C; under a pressure of 1 kg, the compression time and recovery time of the graphene aerogel are 30 ms and 27 ms respectively, and the graphene aerogel meets the commercial standards of sensing materials and shielding materials.

The invention discloses a preparation method of atomic layer deposition synergistic doping modified sodium vanadate, which uses water as solvent, anhydrous sodium iodide and monohydrated vanadium oxyphosphate as sodium source, vanadium source and phosphorus source, and introduces cobalt acetate tetrahydrate and nickel acetate tetrahydrate, and realizes one-step hydrothermal synthesis of HNaV6O assembled by nanosheets and co-embedded with cobalt ions, nickel ions and phosphate ions by synergistically controlling their concentration and ratio, reaction temperature, reaction time and other parameters. 16 ·4H2O nanoflower structure. This method has a simple reaction process, low temperature, easy control, and does not require large equipment and harsh reaction conditions. On this basis, the atomic layer deposition technology was used to successfully realize the cobalt ion, nickel ion and phosphate ion co-embedded HNaV6O with ultra-thin nanoscale metal oxides. 16 Uniform coating of 4H2O positive electrode material. The present invention provides the application of the material in the positive electrode material of sodium ion battery.

The invention provides a carbon-supported platinum-cobalt-copper multifunctional alloy catalyst and a preparation method and application thereof, and belongs to the technical field of energy materials. Wherein the nanocarbon carrier solution is mixed with a chloroplatinic acid solution, a cobalt chloride solution and a copper chloride solution, a sodium hydroxide aqueous solution is added to adjust the pH value, ultrasonic dispersion and stirring are performed to obtain turbid liquid, and the molar ratio of platinum ions to cobalt ions to copper ions is 2: (0.5-1): (0.5-1); then, putting the turbid liquid into a reaction kettle, and reacting at 120-250 DEG C for 1-6 hours to obtain a black colloidal solution; then filtering, washing and drying the black colloidal solution to obtain black powder; and finally, carrying out acid treatment on the black powder, and grinding to obtain the carbon-loaded platinum-cobalt-copper multifunctional alloy catalyst. The catalyst is used for catalyzing an oxygen reduction reaction of a cathode in a hydrogen fuel cell and / or a methanol fuel cell, and / or catalyzing a methanol oxidation reaction of an anode in a direct methanol fuel cell.

The invention relates to a method for recovering nickel and cobalt from a mixture of compounds of these metals from the recycling of spent lithium-ion batteries, comprising the following steps: a) digestion of a mixture of nickel and cobalt compounds in a solution containing hydrochloric acid having a concentration of more than 25 mass %, in case the mixture of nickel and cobalt compounds is solid; or bringing the mixture of nickel and cobalt compounds to a hydrochloric acid concentration of more than 25 mass %, in case the mixture of nickel and cobalt compounds is a solution; b) activation of ion-exchange resin in a column using hydrochloric acid; c) passing the solution from step a) through the column filled with the ion-exchange resin activated in step b); d) washing the column with hydrochloric acid having a concentration of more than 25 mass % in order to wash out the remaining solution containing nickel ions; e) washing the column with hydrochloric acid having a concentration of less than 10 mass % in order to wash out cobalt ions; f) extraction distillation of the nickel ion solution obtained in step d) in hydrochloric acid using sulfuric(VI) acid; phase separation in a spent liquid; recycling of a filtrate to distillation; dissolution of nickel sulfate(VI) and electrolysis in order to recover metallic nickel; g) extraction distillation of the cobalt ion solution obtained in step e) in hydrochloric acid using sulfuric(VI) acid; phase separation in a spent liquid; recycling of a filtrate to distillation; dissolution of cobalt sulfate(VI) and electrolysis in order to recover metallic cobalt; h) extraction distillation of the solution of diluted hydrochloric acid with nickel and cobalt ions obtained after the activation of the ion-exchange resin in step b), using sulfuric(VI) acid; phase separation in a spent liquid; recycling of a filtrate to distillation; recycling of a mixture of the formed cobalt sulfate(VI) and nickel sulfate(VI) to digestion in step a); i) rectification of diluted hydrochloric acid having a concentration below the azeotropic concentration (approx. 20.2 mass % at atmospheric pressure) formed in extraction distillation processes in steps f)-h) in order to concentrate hydrochloric acid and recover and recycle of water; recycling of concentrated hydrochloric acid to extraction distillation in steps f)-h).

The preparation method comprises the following steps: mixing cobalt acetate, a modified ligand, a modified additive and DMF (Dimethyl Formamide), carrying out ultrasonic treatment, adding deionized water and a modified filler, carrying out ultrasonic treatment, carrying out heating reaction, carrying out centrifugation to remove a supernatant, and carrying out drying treatment to prepare the rapid-charge high-capacity artificial graphite negative electrode material, when the cobalt acetate, the modified ligand, the modified additive and the modified filler are subjected to blending reaction, carboxyl on the modified ligand and carboxyl on the modified additive can form coordinate bonds with cobalt ions of the cobalt acetate, then a cobalt metal organic framework is formed on the surface of the modified filler, and a fluorine element in the modified ligand can react with lithium to form lithium fluoride; electron penetration is effectively blocked, and side reactions are reduced; the lithium ion diffusion energy barrier is reduced, rapid charging and discharging are achieved, pyridine groups on the surface of the modified filler can provide lone pair electrons and serve as binding sites of lithium ions, pseudocapacitance is formed, and then the capacity is increased.

The invention relates to the technical field of fuel cell new materials and new energy, in particular to an A-site high-entropy perovskite cathode material and a preparation method thereof. According to the technical scheme, the material comprises the following raw materials: Pr (NO3) 3.6 H2O, La (NO3) 3.6 H2O, Co (NO3) 2.6 H2O, CaCO3, BaCO3, SrCO3 and citric acid. The molar ratio of the praseodymium ions to the lanthanum ions to the cobalt ions to the calcium ions to the barium ions to the strontium ions to the citric acid is 1: (1-2). According to the invention, the A site of the perovskite material is doped with a plurality of elements, a rapid quenching preparation process is combined, the oxygen vacancy concentration and the proton conduction path can be optimized, the ORR activity and the conductivity can be improved, and excellent electrochemical performance and thermal stability can be shown through the synergistic effect of the plurality of elements and structural regulation and control, so that the performance of the cell can be improved.

The invention discloses a cobalt-based catalytic material for efficiently activating persulfate to degrade antibiotics and a preparation method of the cobalt-based catalytic material. The catalytic material is prepared by taking an H-Beta zeolite molecular sieve as a carrier, loading cobalt ions on the molecular sieve through an impregnation method and then carrying out high-temperature roasting treatment. The preparation method comprises the following steps: preparing a cobalt acetate tetrahydrate solution, adding an H-Beta zeolite molecular sieve into the solution to carry out ion exchange, and then carrying out drying and high-temperature roasting. The prepared catalytic material has highly dispersed cobalt active sites and excellent structural stability and catalytic activity. Compared with the prior art, the catalyst provided by the invention has the advantages of simple preparation process, lower cost, high catalytic efficiency, good stability, low cobalt ion dissolution rate, easiness in recovery and reuse and the like, and has a good practical application prospect.

The invention relates to the technical field of comprehensive development and utilization of lignosulfonate and development of novel anti-electromagnetic radiation materials, and discloses a preparation method and application of a biochar / CoFe2O4 dual-loss anti-electromagnetic radiation material. Firstly, iron ions and cobalt ions are adsorbed in a molecular structure of sodium lignosulfonate through electrostatic attraction; then, the biochar / CoFe2O4 composite material is prepared through a high-temperature carbonization treatment one-step method. The anti-electromagnetic radiation material prepared by the invention has both electrical loss and magnetic loss, and has better anti-electromagnetic radiation performance. Lignosulfonate used in the preparation method is low in price and easy to obtain, complex processes and use of a large amount of solvents are avoided in the material preparation process, and the method is economical and environmentally friendly.

A method for recovering at least cobalt of valuable metals, cobalt and nickel, from an acidic solution obtained by subjecting waste containing positive electrode materials for lithium ion secondary batteries to a wet process, the acidic solution comprising cobalt ions, nickel ions and impurities, the method including: a first extraction step for Co recovery, the first extraction step being for extracting cobalt ions by solvent extraction from the acidic solution and stripping the cobalt ions; and a second extraction step for Co recovery, the second extraction step being for extracting cobalt ions by solvent extraction from a stripped solution obtained in the first extraction step for Co recovery and stripping the cobalt ions, wherein the first extraction step for Co recovery includes: a solvent extraction process for extracting cobalt ions in the acidic solution into a solvent; a scrubbing process for scrubbing the solvent that has extracted the cobalt ions; and a stripping process for stripping the cobalt ions in the solvent after the scrubbing into a solution.

The invention discloses a preparation method and application of an MOF (Metal Organic Framework) derived carbon catalyst for regulating and controlling oxygen reduction catalytic performance based on surface strain. The method comprises the following steps: firstly, constructing a cubic MOF core under the assistance of a cationic surface active agent template through coordination self-assembly of a cobalt ion node and an imidazole ligand; then, an MOF heterogeneous core-shell layer is constructed on the surface of the core through a zinc ion mediated epitaxial growth technology, and a double-layer cubic MOF precursor with a clear core-shell interface is formed. Through carbonization treatment at different temperatures, the core MOF generates controllable surface strain in the carbonization process, metal active site coordination and electronic structures can be adjusted, and the adsorption strength of sites to oxygen reduction intermediates is optimized. A rigid porous carbon frame formed after carbonization of an epitaxial MOF heterogeneous core-shell layer constructs a three-dimensional through mass transfer network through micro-mesoporous synergy, meanwhile, the rigid porous carbon frame and the strained core form a nanoscale space isolation area, and thermal migration of metal active sites and Ostwald curing are effectively inhibited by means of the geometric confinement effect. The activity and the stability of the catalyst are remarkably improved based on multiple synergistic effects caused by evolution of an intrinsic micro-nano structure induced by surface strain. The MOF derived carbon catalyst for regulating and controlling the oxygen reduction catalytic performance based on the surface strain, provided by the invention, is simple in preparation process and low in cost, and shows excellent performance and wide application prospect in a zinc-air battery.

A method for treating a laterite-nickel ore feed liquid having a high calcium and magnesium content and a use. The method comprise the following steps: S1, preparing 2-hexyldecanoic acid and an HBL110 / HBL116 extractant into an extraction organic phase; S2, carrying out nickel-cobalt co-extraction on the extraction organic phase and a laterite-nickel ore feed liquid having a high calcium and magnesium content to obtain a first loaded organic phase and raffinate, wherein in the laterite-nickel ore feed liquid having a high calcium and magnesium content, the content of calcium ions is 0.5-1 g / L, the content of magnesium ions is 4-7 g / L, the content of nickel ions is 2.5-4 g / L, and the content of cobalt ions is 0.2-0.5 g / L; S3, using a washing liquid to wash the first loaded organic phase to obtain a second loaded organic phase and washing water, and enabling the washing water to flow back to the laterite-nickel ore feed liquid having a high calcium and magnesium content; S4, adding a back-extraction solution into the second loaded organic phase, and carrying out back-extraction to obtain a nickel-cobalt salt solution and an organic phase having undergone back-extraction; and S5, carrying out saponification on the organic phase having undergone back-extraction to obtain a regenerated extraction organic phase. The present solution is applied to a high calcium and magnesium environment, and calcium and magnesium can be prevented from forming a third phase, thereby achieving a good effect of separating and purifying nickel-cobalt.

The invention provides a method for degrading organic pollutants by catalyzing peracetic acid with trace cobalt based on bicarbonate radical coordination reinforcement, and belongs to the technical field of organic pollutant wastewater treatment. The method comprises the following steps: sequentially adding a cobalt salt, a ligand and peracetic acid into the organic wastewater, and reacting to complete degradation of organic pollutants, the ligand is a soluble inorganic salt carrying bicarbonate radicals. A novel peracetic acid activation method is constructed, a special cobalt complex structure is formed by introducing a synergistic effect mechanism of trace cobalt ions and bicarbonate ions, Co (III) / Co (II) valence cycle is effectively promoted, the generation amount of organic free radicals and high-valence cobalt active substances is increased, and the degradation efficiency of organic pollutants is remarkably improved. The method provided by the invention has the advantages of small addition amount of cobalt ions, strong degradation capability and the like, is strong in environmental interference resistance, and is suitable for a weak acid environment.

The present invention discloses a preparation method of cobalt-doped and synergistically MXene-coated sodium vanadate composite powder. Using water as a solvent, sodium iodide anhydrous and vanadyl phosphate monohydrate as the sodium source and vanadium source, and introducing cobalt acetate tetrahydrate, by synergistically controlling parameters such as concentration and ratio, reaction temperature, reaction time, filling ratio, etc., the synthesis of HNaV6O embedded with cobalt ions assembled by nanosheets through a one-step hydrothermal method is achieved. 16 Using CTAB, the etched Ti3C2Tx and HNaV6O 16 ·4H2O are compositely assembled through electrostatic coupling, and finally cobalt-doped and synergistically Ti3C2Tx-coated HNaV6O 16 ·4H2O is prepared; the present invention improves the crystal structure and electronic conductivity of HNaV6O 16 ·4H2O, enhances its capacity and cycle stability, and the present invention also discloses the application of this material in the cathode material of sodium-ion batteries.

The invention relates to a preparation method of large-granularity cobaltosic oxide for a battery, and belongs to the technical field of battery preparation. The preparation method comprises the following steps: dissolving cobalt salt in deionized water to obtain a high-concentration cobalt ion solution, mixing sodium oxalate and niobium ammonium oxalate for use to form a specific precursor structure, carrying out a co-precipitation reaction on cobalt ions, oxalate and niobium ammonium oxalate in an aqueous solution to generate a cobalt-containing oxalate and niobate compound precipitate, and carrying out solid-liquid separation on the cobalt-containing oxalate and niobate compound precipitate. Then hydrogen peroxide is used for promoting oxidation of cobalt ions, and formation and crystallization of cobalt oxalate precipitates are further promoted; in the preparation process, water is effectively removed through freeze drying, meanwhile, the morphology and structure of precipitates are kept, organic matter and volatile impurities are removed in the roasting and re-roasting process, and formation and stability of a cobaltosic oxide crystal structure are promoted; the stable crystal structure is favorable for prolonging the cycle life and improving the safety of the battery.

The application discloses a preparation method of a cobalt-based biochar composite material and application of the cobalt-based biochar composite material in persulfate oxidation, and comprises the following operation steps: a proper amount of sodium alginate is weighed, calcined, activated and dried to obtain a derived original biochar SA; after the SA is used as an adsorbent to adsorb cobalt ions, drying is performed to obtain a cobalt-containing biochar CoSA; the CoSA is uniformly ground with urea, pyrolysis is performed, washing, filtering and drying are performed, and vacuum drying is performed to obtain a cobalt-based biochar composite material CoNBC based on sodium alginate; and the activation method is that the SA is mixed with potassium hydroxide, ground in a jade mortar for 5-30 min, and then activated in ultrapure water for 1-8 h.The raw material used in the application is environment-friendly, the preparation process is simple, the cobalt-based biochar composite material obtained has excellent catalytic capacity for persulfate, can effectively control the precipitation of transition metals, reduces pollution, and greatly improves the utilization rate of metal elements.

The invention belongs to the technical field of electrocatalytic materials, and discloses a CeO2 / NiCo2O4 heterojunction oxygen evolution reaction electrocatalyst and a preparation method thereof. According to the electrocatalyst, a composite protection layer composed of nitrogen-doped carbon quantum dots and CeO2 is constructed on the surface of a NiCo2O4 nanosheet array, cobalt ions are captured and dissolved out through pyridine nitrogen, reintegration is promoted through CeO2 oxygen vacancy, and interface dynamic self-repairing is achieved. And the nitrogen-doped carbon quantum dots are embedded into the CeO2 layer and are in direct contact with NiCo2O4 to synergistically inhibit cobalt loss and maintain structural integrity. By constructing the CeO2 / nitrogen-doped carbon quantum dot composite interface layer with dynamic ion capture and self-repairing capabilities, the problems of structure instability and performance degradation caused by cobalt ion dissolution of the NiCo2O4-based oxygen evolution reaction electrocatalyst under the working condition of strong oxidizing property are successfully solved; the method has important application value and industrialization prospect in the technical field of green hydrogen energy electrolyzed water.

To provide a method for producing a leachate containing a nickel ion and a cobalt ion, by using a material containing nickel and cobalt less expensive than metal nickel powder.SOLUTION: A hydroxide particle containing nickel and cobalt is mixed with ammonia water preferably containing ammonium carbonate or ammonium hydrogen carbonate prepared such that an ammonium carbonate concentration or an ammonium hydrogen carbonate concentration is within a range of 0.5 mol / L to 4.1 mol / L, to obtain a slurry. A leach treatment is applied to the obtained slurry under a prescribed temperature condition to obtain a leachate containing a nickel ion and a cobalt ion leached from the hydroxide particle.SELECTED DRAWING: Figure 2

Compared with the prior art, the MOF-based adsorption desulfurizing agent and the preparation method and application thereof have the advantages that a NaY molecular sieve is subjected to cobalt ion exchange by adopting a heating and stirring method to obtain a modified CoY molecular sieve, ZIF67 is loaded on the CoY molecular sieve in situ by adopting a hydrothermal method, the specific surface area and adsorption active sites are increased, and the adsorption capacity of the adsorption desulfurizing agent is improved; the adsorption efficiency and the regeneration capacity on sulfide are improved. The prepared ZIF67 / CoY-1 adsorbent has good adsorption efficiency on H2S, methyl mercaptan and thiophene, the adsorption efficiency on H2S is still 100% after 1000 min of adsorption, the adsorption efficiency on methyl mercaptan is kept to be 90% or above, the adsorption efficiency on thiophene is kept to be 70% or above, the adsorption performance on COS and CS2 is kept to be about 40%, and the ZIF67 / CoY-1 adsorbent has comprehensive sulfide adsorption performance.