222 results about "Cobalt chloride" patented technology

The invention discloses an organic plugging agent, a preparation method thereof and application of the organic plugging agent to inhibition of SAGD steam cavity edge water invasion. The organic plugging agent is prepared from the following raw materials: epoxy resin, a curing agent, nano aerogel, mineral fibers, plant fibers, a reactive diluent, a heat stabilizer and water, the epoxy resin is at least one of glycidyl amine epoxy resin and alicyclic epoxy resin; the curing agent is at least one of amino resin, dicyandiamide and hydrazide; the heat stabilizer is at least one of thiourea, sodium thiosulfate and cobalt chloride. The organic plugging agent is excellent in high temperature resistance, mineralization resistance and plugging performance, the organic plugging agent, nitrogen and an inorganic plugging agent are injected into a water plugging system of an SAGD steam cavity edge well in a slug mode, the organic plugging agent is applied to SAGD high-temperature and high-leakage well conditions, and the SAGD production effect can be effectively improved.

The invention discloses cobaltosic oxide loaded ruthenium dioxide fibers as well as a preparation method and application thereof, and relates to the technical field of electrolyzed water. The preparation method comprises the following steps: carrying out wet spinning on sodium alginate and calcium chloride to prepare calcium alginate fibers, then sequentially reacting the calcium alginate fibers with hydrochloric acid and cobalt chloride, calcining to obtain cobaltosic oxide fibers, reacting the cobaltosic oxide fibers with ruthenium trichloride, and carbonizing to obtain the cobaltosic oxide loaded ruthenium dioxide fibers. According to the invention, Co3O4 is utilized to transfer electrons to RuO2, so that the valence state of ruthenium is reduced, and dissolution of high-valence ruthenium in an acidic OER process can be inhibited, so that the OER activity under an acidic medium is improved, and the stability can be improved. Specifically, in a 0.1 M HClO4 electrolyte, under the current density of 10 mA / cm < 2 >, the overpotential is 220 mV, and the voltage is basically unchanged after continuous testing for 100 h.

The invention belongs to the technical field of catalyst preparation, and particularly relates to a preparation method of a high-dispersion platinum group noble metal-based catalyst, which comprises the following steps: preparing a porous rod-like cobaltosic oxide carrier material, cleaning with deionized water, drying, and roasting for 4-8 hours; dissolving chloroplatinic acid or platinum chloride in deionized water to form a noble metal solution; soaking the treated cobaltosic oxide carrier in a noble metal solution, taking out the carrier from the solution after soaking is completed, filtering, cleaning, drying, and roasting for 4-6 hours in an inert gas atmosphere; and keeping the temperature and reducing for 2-4 hours in a hydrogen atmosphere. When the porous rodlike cobaltosic oxide carrier material is prepared, firstly, a cobalt chloride solution is poured into the lower part of the double-layer cavity for stirring, a urea solution drips into the cavity through a spray head in the stirring process, a stirring barrel is turned over after stirring is completed, the stirred solution flows out and is filtered, the cobalt chloride solution and the urea solution are continuously added into the double-layer cavity for stirring and mixing, and the porous rodlike cobaltosic oxide carrier material is prepared. Therefore, the porous rod-like cobalt oxide solvent material is efficiently prepared.

The invention relates to the field of electro-catalysis and nano materials, in particular to a preparation method and application of a basic cobalt chloride and ferrocobalt spinel composite electrode material. According to the method, an alkaline low-water high-viscosity alcohol reaction system is adopted, and basic cobalt chloride and a ferrocobalt spinel material are promoted to be deposited on a nickel net at the same time under the high-temperature condition. The prepared basic cobalt chloride and ferrocobalt spinel composite electrode has high catalytic activity and stability, shows good electrochemical performance in a seawater environment, and can be used as a high-activity and high-stability seawater electrolysis hydrogen production electrode.

The invention relates to the technical field of hard alloy, and particularly discloses a hard alloy material containing graphene oxide and a preparation method thereof.The preparation method comprises the following steps that S1, a graphene suspension aqueous solution, a cobalt chloride aqueous solution and an ammonium oxalate aqueous solution are prepared; s2, mixing the graphene suspension aqueous solution with a cobalt chloride aqueous solution to obtain a GO / CoCl2. 6H2O mixed aqueous solution, adding an ammonium oxalate aqueous solution, uniformly mixing, heating, and carrying out a hydrothermal reaction to obtain a GO / CoC2O4 precursor; s3, placing the GO / CoC2O4 precursor in a reducing atmosphere, and heating and calcining the GO / CoC2O4 precursor to obtain GO / Co composite powder; and S4, the GO / Co composite powder and the tungsten-carbon powder are mixed and sintered, and the hard alloy material is obtained. According to the preparation method, graphene oxide is uniformly dispersed in cobalt powder through a hydrothermal reaction in combination with a high-heat reduction calcination treatment mode, GO / Co composite powder is prepared, then the GO / Co composite powder and hard alloy powder are subjected to compound sintering, and the problems that graphene is not uniformly dispersed in hard alloy and is easy to agglomerate can be effectively solved.

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 the technical field of electrocatalysts, in particular to a ruthenium cobalt oxide self-supporting electrode and a preparation method and application thereof. A titanium mesh is used as a substrate, a hydrochloric acid aqueous solution of ruthenium chloride and cobalt chloride grows ruthenium dioxide nanoparticles in situ on the titanium mesh through a hydrothermal method, cobalt atoms are doped into ruthenium dioxide crystal lattices, and a self-supporting electrode of cobalt doped ruthenium dioxide is formed and used as an electrocatalyst for oxygen evolution reaction and hydrogen evolution reaction. A catalytic material grows in situ on a three-dimensional porous conductive substrate, a self-supporting catalyst is prepared, a binder is not needed, the specific surface area is larger, more active sites can be exposed, the activity and stability of the material are further improved, low-electronegativity cobalt provides electrons for ruthenium through adjustment of doped elements, excessive oxidation of ruthenium is inhibited, and the performance of the catalyst is improved. The activity and stability of the catalyst are improved to a certain extent, so that the catalyst has good performance under high current density, is prepared by using a hydrothermal method, is simple and controllable in process, and can be widely applied to water electrolysis devices.

The invention discloses a modified cobaltosic oxide catalyst and a preparation method and application thereof.The catalyst comprises a carrier foamed nickel, tungsten and chlorine co-doped cobaltosic oxide nanosheets W and Cl-Co3O4, the tungsten and chlorine co-doped cobaltosic oxide nanosheets W and the Cl-Co3O4 are loaded on the carrier, cobalt chloride and tungsten salt serve as precursors of the catalyst, and the tungsten and chlorine co-doped cobaltosic oxide nanosheets W and the Cl-Co3O4 are loaded on the carrier. The preparation method comprises the following steps: firstly, carrying out a hydrothermal reaction to obtain a nickel foam loaded tungsten-doped basic cobalt chloride nanosheet W-Co2 (OH) 3Cl2, and then carrying out in-situ conversion on the Co2 (OH) 3Cl2 into a nickel foam loaded tungsten and chlorine co-doped cobaltosic oxide nanosheet W, Cl-Co3O4 through calcination. According to the invention, chlorine and tungsten are introduced into cobaltosic oxide, so that the activity and stability of electrocatalytic oxygen evolution are improved, and the cobaltosic oxide is used as an anode catalyst for electrocatalytic seawater decomposition and has excellent activity and stability of electrocatalytic oxygen evolution.

The invention discloses a MnIn2S4-coated Co9S8 heterojunction photocatalyst and a preparation method and application thereof, and belongs to the technical field of photocatalytic materials.The preparation method comprises the steps that firstly, urea, cobalt chloride, water and ethylene glycol serve as raw materials to prepare a Co9S8 precursor; carrying out high-temperature calcination, namely firstly carrying out heat preservation at 350-420 DEG C for 1-2 hours, then heating to 440-460 DEG C, carrying out heat preservation for 3-4 hours, then heating to 580-610 DEG C, and carrying out heat preservation for 3-4 hours, so as to obtain a Co9S8 hollow nanotube; and then growing the MnIn2S4 nanosheet on the surface of the Co9S8 hollow nanotube in situ. The photocatalyst prepared through a hydrothermal-calcination combined strategy has a larger specific surface area and a wider light absorption range, and the migration distance of current carriers can be effectively shortened through a special three-dimensional hollow structure, so that better photocatalytic performance is shown, and the photocatalyst has a large application prospect in the fields of energy and environment.

Provided is a method for separating impurities and cobalt without using an electrolysis process from a cobalt chloride solution containing impurities and producing a high purity cobalt sulfate. The production method for cobalt sulfate includes: a copper removal step (S1) of adding a sulfurizing agent to a cobalt chloride solution containing one or more impurities of copper, zinc, manganese, calcium, and magnesium and generating a precipitate of sulfide of copper to separate to remove copper; a neutralization step (S2) of adding a neutralizer or a carbonation agent to a cobalt chloride solution having undergone through the copper removal step (S1) and generating cobalt hydroxide or basic cobalt carbonate to separate magnesium; a leaching step (S3) of adding sulfuric acid to the cobalt hydroxide or the basic cobalt carbonate to obtain cobalt sulfate solution; and a solvent extraction step (S4) of bringing an organic solvent containing an alkyl phosphoric acid-based extractant to the cobalt sulfate solution and extracting zinc, manganese, and calcium into the organic solvent to separate to remove zinc, manganese, and calcium. These steps are sequentially executed.

The invention provides a preparation method of a high-spin-state cobaltosic oxide anchored ruthenium monatomic composite catalyst, which comprises the following steps: S1, sequentially dissolving cobalt chloride hexahydrate, ruthenium chloride and sodium hydroxide in deionized water, and uniformly stirring to obtain a first mixed solution; s2, sequentially adding the pretreated flexible carbon cloth and the first mixed solution into a hydrothermal reaction kettle for hydrothermal reaction to obtain a first compound; s3, taking out the first compound, washing with deionized water and ethanol, and drying to obtain a second compound; s4, the second compound is placed in an argon environment to be subjected to annealing treatment, and a third compound is obtained; and S5, adding the third compound into a hydrochloric acid solution to carry out etching treatment, washing with deionized water, and drying to obtain the high-spin-state cobaltosic oxide nanosheet anchored ruthenium monatomic composite catalyst. The composite catalyst has a high-spinning porous nanosheet structure, is rich in high-spinning Co < 3 + >, and can be used as a high-performance bifunctional catalyst in a water electrolysis hydrogen evolution reaction and an oxygen evolution reaction.

This utility model discloses a timed liquid replenishment system for cobalt electrolytic deposition, configured in connection with an electrolytic cell. The system includes: a concentration tank, at least one concentration detection unit, a draining component, and a replenishment component. The concentration tank and electrolytic cell are spaced apart for temporary storage of cobalt chloride raw material. The concentration detection unit is built into and connected to the electrolytic cell to detect the concentration of the liquid within it. The draining component is connected to and communicates with the interior of the electrolytic cell to quantitatively drain the liquid. The replenishment component is connected to both the interior of the concentration tank and the interior of the electrolytic cell to quantitatively replenish cobalt chloride raw material. This utility model effectively solves the problem in the prior art where manual control during the replenishment of cobalt chloride solution to the electrolytic cell prevents automated production, thus reducing the yield of electrolytic cobalt.

The invention discloses a preparation method and application of a cobalt-nitrogen-doped mesoporous carbon catalyst, and belongs to the technical field of catalyst preparation, and the preparation method comprises the following steps: mixing and grinding glucose and an SBA-15 mesoporous molecular sieve, pyrolyzing in a nitrogen atmosphere, soaking the obtained product in hydrofluoric acid to remove an SBA-15 template, alternately centrifuging with water and ethanol to obtain a precipitate, and drying to obtain the cobalt-nitrogen-doped mesoporous carbon catalyst. Mesoporous carbon is obtained; the preparation method comprises the following steps: respectively dissolving phenanthroline and cobalt chloride hexahydrate in ethanol, and mixing to form a Co-phen solution; and soaking the obtained mesoporous carbon in a Co-phen solution, evaporating the solvent after soaking, grinding into powder, and carrying out heat treatment in a nitrogen atmosphere to obtain the cobalt-nitrogen doped mesoporous carbon catalyst. The cobalt-nitrogen-doped mesoporous carbon catalyst shows excellent oxygen reduction catalytic activity under the alkaline condition, the half-wave potential reaches 0.873 V and is close to a 4-electron transfer path, and the stability and methanol tolerance are superior to those of a commercial Pt / C catalyst.

The invention relates to the technical field of preparation of alloy electrocatalysts, in particular to a method for preparing an alloy electrocatalyst by a rotary microwave-assisted method, which comprises the following steps: stirring and mixing carbon powder, cobalt chloride, deionized water and absolute ethyl alcohol, adding ammonia water, ultrasonically dispersing, filtering and collecting a filter cake, and drying to obtain the alloy electrocatalyst. Drying, heating, introducing hydrogen, carrying out heat preservation treatment, and collecting to obtain a precursor; taking the precursor, adding ethylene glycol, a sodium hydroxide solution, chloroplatinic acid and deionized water, carrying out ultrasonic-assisted treatment, collecting to obtain a mixed solution, placing the mixed solution in a sealed reaction device, and carrying out rotary microwave treatment; and carrying out pressure treatment, filtering, taking a filter cake, drying, heating, carrying out heat preservation and annealing treatment, collecting an annealed material, carrying out acid pickling treatment, and drying. The synergistic effect of the rotating microwaves ensures that the materials are uniformly heated, the particle aggregation phenomenon is reduced, a foundation is laid for the high activity and durability of the catalyst, and the method is more suitable for industrial large-scale production.

The preparation method comprises the following steps: dissolving sodium alginate and carbon black in water, adding polyacrylic acid, and carrying out a stirring reaction so as to obtain a mixture; then adding a CN precursor while heating and stirring, heating to a gel state, and roasting at high temperature to obtain a carbon nitride composite material; dispersing the composite material into water, adding a cobalt chloride solution, carrying out ultrasonic treatment, and adjusting the pH value to 10-11 to obtain a mixture; and adding a NaBH4 solution, reducing to obtain nano particles, filtering, washing and drying to obtain the catalyst. According to the preparation method, the carbon nitride composite carrier with high specific surface area is prepared firstly, then the active component is loaded, and the photocatalytic degradation effect of p-nitrophenol is improved through the synergistic effect of the composite carrier and the active component.

The invention relates to a method for producing mecobalamin by using a micro-channel reactor, which comprises the following steps: firstly, introducing a reaction mixed solution of cyanocobalamin, cobalt chloride, sodium borohydride and purified water into a first micro-channel reactor for reduction reaction; the obtained cyanocobalamin solution in the reduction state is introduced into a second microchannel reactor to be subjected to a methylation reaction with a trimethylsulfoxide iodide solution, and finally, an obtained mecobalamin solution is subjected to post-treatment to obtain a finished product. Compared with the prior art, the micro-channel reactor is used for continuous production, the mass and heat transfer effect is good, the reaction temperature can be accurately controlled, side reactions are further reduced, and the product quality is effectively improved.

The invention discloses a preparation method of a high specific gravity tungsten-nickel-cobalt nanopowder and alloy with uniform element distribution and fine particle size, belonging to the technical field of shielding materials and powder metallurgy. The method comprises the following steps: dissolving tungsten trioxide, cobalt chloride and nickel chloride in deionized water, mixing and stirring evenly, heating and stirring to evaporate the liquid, and then drying in an oven, grinding the dried agglomerates with a mortar and sieving to obtain a precursor powder. Subsequently, the precursor powder is sent into an argon plasma torch through a carrier gas hydrogen, and the powders from various parts are collected after the reaction is completed. The powders are loaded into a stainless steel mold, cold pressed and sintered in a tubular furnace under a hydrogen atmosphere to obtain a tungsten-nickel-cobalt heavy alloy block. The particle size of the tungsten-nickel-cobalt nanopowder prepared by the present invention is about 25nm, and the relative density of the tungsten-based heavy alloy after sintering is >99%. The shielding test results show that the linear absorption coefficient is 1.31 times that of lead.

The invention relates to application of a cobalt compound, a solar cell, slurry of the solar cell and a photovoltaic solder strip. In the application of the cobalt compound in preparation of the photovoltaic module, the cobalt compound comprises anhydrous cobalt chloride and thiocyanide. The cobalt compound is applied to the photovoltaic module, and when water vapor intrudes into the photovoltaic module, anhydrous cobalt chloride in the cobalt compound becomes red when encountering water, so that the area, provided with the cobalt compound, in the photovoltaic module presents conspicuous red which is used as a visual warning signal; maintenance personnel can quickly find and process potential problems of the photovoltaic module; and when the temperature of the photovoltaic module is too high, the anhydrous cobalt chloride reacts with the thiocyanide to present black, so that maintenance personnel can be warned of possible problems of the photovoltaic module in time.

The invention provides a reflective integrated electrochromic device. The reflective integrated electrochromic device sequentially comprises a first substrate layer, a working electrode layer, an integrated electrochromic layer, a counter electrode layer and a second substrate layer, the integrated electrochromic layer comprises a metal source compound; the metal source compound is selected from silver chloride, silver acetate, silver nitrate, silver perchlorate, silver sulfate, silver cyanide, silver sulfide, silver hexafluorophosphate, silver tetrafluoroborate, silver tetrachloroaluminate, silver trifluoromethanesulfonate, silver bis (trifluoromethane sulfonimide), copper fluoride, copper chloride, copper cyanide, copper sulfate, copper acetate, copper aluminate, cuprous fluoride, cuprous chloride, cuprous cyanide, gold chloride and gold cyanide; the catalyst is one or more of gold sulfide, gold chloride, gold (II) sulfide, nickel chloride, nickel sulfate, cobalt chloride and platinum chloride. The device has a relatively large transmittance / reflectivity dynamic change range, can perform light and heat management at the same time, and can keep a stable coloring or fading state for one month or even several months under a no-load condition.

The invention discloses cobalt chloride electrolysis equipment and a cobalt chloride electrolysis method. The cobalt chloride electrolysis equipment comprises an electrolytic bath; the anion exchange membrane is arranged in the electrolytic tank; the proton membrane is arranged in the electrolytic cell; wherein the proton membrane and the anion exchange membrane form a middle compartment, the proton membrane and the electrolytic cell form a positive compartment, and the anion exchange membrane and the electrolytic cell form a negative compartment; the cathode is arranged in the cathode compartment; the anode is arranged in the anode compartment; the power supply is electrically connected with the cathode and the anode respectively; and the magnetic pump is used for circulating the catholyte in the cathode compartment and the anolyte in the anode compartment respectively. According to the embodiment of the invention, the emission of chlorine can be reduced, and the pollution to the environment is reduced.

The invention provides an aluminum-doped lithium cobalt oxide precursor and a preparation method and application thereof, and the preparation method comprises the following steps: (1) a nucleation stage: adding a cobalt chloride solution, an aluminum salt solution and a precipitant solution into a reaction base solution, and carrying out first coprecipitation to obtain a solution containing an inner core; (2) growth stage: adding a cobaltous sulfate solution, an aluminum salt solution and a precipitant solution into the solution containing the inner core obtained in the step (1), and carrying out second coprecipitation to obtain a solution containing precipitates; and (3) final stage: adding a solution containing cobalt chloride and cobalt sulfate, an aluminum salt solution and a precipitator solution into the solution containing the precipitate obtained in the step (2), carrying out third coprecipitation, and carrying out heat treatment to obtain the aluminum-doped lithium cobalt oxide precursor. According to the preparation method, the problems of particle cracking and small particle explosion of aluminum-doped cobaltosic oxide under the condition of high aluminum doping amount can be avoided, and a lithium cobalt oxide battery prepared from the obtained aluminum-doped lithium cobalt oxide precursor shows excellent electrochemical performance.

The invention provides a preparation method of a composite material for a photo-anode, the photo-anode and a battery, the preparation method of the composite material comprises the following steps: (1) mixing citric acid, urea and ethylene glycol, stirring, heating, filtering and dialyzing, and freeze-drying a solution obtained after dialyzing to obtain carbon quantum dot powder; (2) dissolving thioacetamide and cobalt chloride pentahydrate into an aqueous solution of ethanol, adding the carbon quantum dot powder obtained in the step (1), stirring, carrying out hydrothermal treatment to obtain a precipitate, washing with absolute ethyl alcohol, and then centrifuging and drying to obtain carbon quantum dot doped cobalt sulfide powder; and (3) adding titanium dioxide and the carbon quantum dot doped cobalt sulfide powder obtained in the step (2) into an ethanol aqueous solution, stirring, carrying out hydrothermal treatment to obtain a precipitate, washing, centrifuging and drying to obtain a carbon quantum dot-cobalt sulfide-titanium dioxide composite material, namely the composite material for the photo-anode. According to the invention, higher photoelectric conversion efficiency is obtained.

The invention discloses a basic magnesium sulfate cement cattle and sheep lick brick and a preparation method thereof, and belongs to the technical field of animal feeds, the basic magnesium sulfate cement cattle and sheep lick brick comprises the following components by mass: 30-40% of basic magnesium sulfate cement, 20-30% of salt, 10-15% of honey, 5-10% of starch, 5-10% of corncob, 5-10% of bentonite, 0.1-0.3% of feed-grade copper sulfate, 0.03-0.06% of feed-grade cobalt chloride, and the balance of water. 0.2 to 0.3% of feed-grade manganese sulfate; and 0.1 to 0.3% of feed-grade basic zinc chloride. Wherein the basic magnesium sulfate cement is prepared from magnesium oxide, feed-grade magnesium sulfate and aminosalicylic acid. According to the invention, basic stability of the lick brick is ensured, the lick brick is endowed with the ability of gradually disintegrating and releasing trace elements in the licking process of cattle and sheep, the trace elements are released quickly, high requirements of cattle and sheep on the trace elements in the stages of growth, reproduction, stress and the like can be met, and the quality of the cattle and sheep is improved. The problems of slow growth, low immunity, reproductive disorder and the like caused by lack of trace elements are effectively prevented.

The invention discloses a system for preparing large-particle cobalt chloride hexahydrate through ultralow-temperature evaporative crystallization, which comprises a stock solution tank, a forced circulation pump, a forced heat exchanger, an ultralow-temperature crystallizer and a vacuum unit, the stock solution tank is connected with the forced circulation pump through a preheating unit, the forced circulation pump is located between the forced heat exchanger and the ultralow-temperature crystallizer, and the vacuum unit is connected with the forced heat exchanger. The forced circulation pump is used for circularly conveying a cobalt chloride solution to enter the forced heat exchanger to be heated and then enter the ultralow-temperature crystallizer to be subjected to flash evaporation, the ultralow-temperature crystallizer is connected with a centrifugal machine, and a gas treatment unit is arranged between the ultralow-temperature crystallizer and the forced heat exchanger; the gas treatment unit is used for treating secondary steam generated by flash evaporation and then supplying the treated secondary steam to the forced heat exchanger, and the vacuum unit is connected with the forced heat exchanger and used for maintaining a low-temperature environment for the ultralow-temperature crystallizer; no matched cooling crystallization equipment is needed, crystallization is directly completed through an ultralow-temperature evaporation and crystallization integrated process, the technological process is shortened, and the equipment investment and the occupied area are reduced.

The present application relates to the technical field of wastewater treatment of gold hydrometallurgy process, and particularly discloses a biological treatment method of gold smelting wastewater.A biological treatment method of gold smelting wastewater, comprising acid-base adjustment, sulfidation reaction, first flocculation and precipitation, biological treatment, second flocculation and precipitation, and monitoring and discharge; wherein the immobilized biochar used in the biological treatment is prepared by mixing activated sludge after banana stem, cassava residue and kelp are selected as the source of biochar and then the nutrients such as urea, starch phosphate sodium, phospholipase C, cobalt chloride, zinc chloride and magnesium chloride are attached to the biochar.The present application has the effect of improving the efficiency of biological treatment of acidic wastewater.

The present invention provides a method for producing high-purity cobalt sulfate by separating impurities and cobalt from a cobalt chloride solution containing impurities without using an electrolysis process. The method sequentially implements the following steps: a decoppering step (S1), in which a sulfiding agent is added to a cobalt chloride solution containing one or more impurities selected from copper, zinc, manganese, calcium, and magnesium to form a copper sulfide precipitate, which is then separated and removed; a neutralization step (S2), in which a neutralizing agent or a carbonating agent is added to the cobalt chloride solution that has undergone the decoppering step (S1), to form cobalt hydroxide or alkaline cobalt carbonate, thereby separating the magnesium; a leaching step (S3), in which sulfuric acid is added to the cobalt hydroxide or alkaline cobalt carbonate to obtain a cobalt sulfate solution; and a solvent extraction step (S4), in which an organic solvent containing an alkylphosphoric acid-based extractant is brought into contact with the cobalt sulfate solution to extract zinc, manganese, and calcium into the organic solvent for separation and removal. The addition of the neutralizing agent or carbonating agent in the neutralization step (S2) is performed using a countercurrent multi-stage process.

The invention discloses a preparation method and application of a NiCo2O4 (at) C core-shell nanowire electrode material. The preparation method comprises the following steps: dissolving cobalt chloride hexahydrate, nickel chloride hexahydrate, lauryl sodium sulfate and urea in water to obtain a precursor solution, immersing carbon fiber cloth in the precursor solution, and carrying out a hydrothermal reaction; cooling to room temperature, washing and sintering to obtain a NiCo2O4 nanowire taking the carbon fiber cloth as the substrate; the preparation method comprises the following steps: putting a NiCo2O4 nanowire taking carbon fiber cloth as a substrate into a mixed solution of acrylonitrile, acetone and azodiisobutyronitrile, and carrying out hydrothermal reaction; and cooling to room temperature, washing and sintering to obtain the NiCo2O4 (at) C core-shell nanowire taking the carbon fiber cloth as the substrate. The carbon fiber cloth on which the NiCo2O4 (at) C core-shell nanowires grow serves as a positive electrode to assemble the supercapacitor, the capacitance retention rate of the supercapacitor is 94% after 25000 cycles of charge and discharge, the cycle stability of the supercapacitor is far higher than that of most existing pseudocapacitance supercapacitors, the supercapacitor has good electrochemical stability, meanwhile, the self-discharge rate of the capacitor is restrained, and the performance of the supercapacitor is improved. The excellent electrochemical performance is shown.

The invention relates to the technical field of electrochemistry, and discloses a method for preparing a membrane electrode of an anion exchange membrane electrolytic cell from transition metal sulfide Co-MoS2, which comprises the following steps of: firstly, preparing a Co-doped MoS2 catalyst by taking cobalt chloride hexahydrate, ammonium molybdate tetrahydrate and thiourea as raw materials through hydro-thermal synthesis, then stirring and mixing the Co-doped MoS2 catalyst with conductive carbon black, anion exchange liquid and the like, and preparing the membrane electrode of the anion exchange membrane electrolytic cell from the Co-doped MoS2 catalyst. According to the present invention, the transition metal sulfide is modified to prepare the slurry, and the slurry is sprayed on the surface of the anion exchange membrane, such that the catalyst suitable for the anion exchange membrane electrolytic cell is obtained, and the membrane electrode can be used for the anion exchange membrane electrolytic cell, and has good water electrolysis performance. The membrane electrode can provide the current density of 1A / cm <-2 > under the voltage of 2.0 V, can stably operate for 100 hours under the current density, and provides an effective strategy for developing a high-performance non-noble metal water electrolysis catalyst.

The invention provides a colorimetric determination method for platinum element detection, and relates to the field of platinum element colorimetric determination. The colorimetric determination method for platinum element detection comprises the following specific determination steps: step 1, putting blood with platinum element and blood without platinum element into two corresponding reagent tubes, and correspondingly adding the same parts of potassium chloroplatinate, cobalt chloride, hydrochloric acid and ultrapure water raw materials; 2, a detection reagent tube is placed in an arc-shaped clamping block and above a rotating disc; and 3, end knobs of the two-way screws rotate, threaded blocks on the two sides of the two-way screws get close to or away from the middle after rotation, and therefore the positions of the arc-shaped clamping blocks are moved. A worker extracts liquid in the two reagent tubes, the content of platinum is measured through an ultraviolet-visible spectrophotometric method, the content of platinum is accurately measured through a relation curve of the concentration and the maximum absorbance and through colorimetry, and rapid and efficient colorimetric measurement operation on platinum is achieved.

The invention belongs to the technical field of novel wave-absorbing materials, and particularly discloses a nano flower-shaped sulfur-doped cobalt-molybdenum hydroxide wave-absorbing material and a preparation method thereof.The preparation method comprises the following steps that firstly, cobalt chloride, hexadecyl trimethyl ammonium bromide, 2-methylimidazole and deionized water are mixed, and a nano cubic ZIF-67 wave-absorbing material is obtained through centrifugation, washing and drying; then, by taking the ZIF-67 wave-absorbing material as a precursor, etching ammonium molybdate to obtain a cobalt-molybdenum hydroxide wave-absorbing material with a hollow cubic block shape; and finally, carrying out hydrothermal reaction on the cobalt-molybdenum hydroxide wave-absorbing material and sulfur powder, and doping the sulfur element to obtain the nano-flower-shaped sulfur-doped cobalt-molybdenum hydroxide wave-absorbing material. According to the nano flower-shaped sulfur-doped cobalt-molybdenum hydroxide wave-absorbing material and the preparation method thereof, the preparation method is simple, safe and reliable, the obtained material has a larger specific surface area and smaller density, and the loss capacity of the material to incident electromagnetic waves is greatly improved.