129 results about "COBALTOUS NITRATE" patented technology

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

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

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

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

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

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

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

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

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

This invention discloses a method for preparing sheet-like nano-sized cobalt hydroxide. The method includes the following steps: using cobalt nitrate as the cobalt source and sodium hydroxide solution as the precipitant, a co-precipitation reaction is carried out. The cobalt nitrate solution and sodium hydroxide solution are added together to a reaction vessel. By controlling the synthesis pH and temperature, the synthesized cobalt hydroxide slurry is washed with hot pure water, dried, and crushed using an air jet mill to obtain sheet-like nano-sized pink cobalt hydroxide with low sodium content. Specifically, the key to preparing sheet-like nano-sized cobalt hydroxide is to prevent oxidation and particle agglomeration during the synthesis process. This invention uses a low-temperature (40-60℃), low-pH (8.0-9.0) cobalt hydroxide synthesis process with a small amount of antioxidant added to prepare sheet-like micron-sized cobalt hydroxide that is not easily oxidized or agglomerated. In addition, at the low pH, the sodium content is low, making the subsequent filtration and washing steps easier to operate.

The invention relates to a preparation method for in-situ growth of a NiFeS nanosheet array by taking ZIF-67 as a template for integral water decomposition. The preparation method comprises the following steps: (1) treating cobalt nitrate and 2-methylimidazole by using a methanol solution to obtain ZIF-67 dodecahedron nanoparticles; then mixing the ZIF-67 and PDA in methanol, and carrying out water bath reflux to obtain Co (ZIF-67) (at) PDA for later use; and (2) putting the sample into a tubular furnace, and continuously calcining for 1 hour at 800 DEG C in an N2 atmosphere to obtain the Co-coated CN-800. And (3) carrying out hydrothermal reaction on the sample and a certain amount of FeCl3, Ni (NO3) 2, urea and NH4F to obtain NiFe-OH-Co-CN, respectively placing the prepared material and S powder in an upstream quartz boat and a downstream quartz boat of a tubular furnace, and keeping for 1 hour at 500 DEG C in an N2 atmosphere to obtain the NiFeS-Co-CN heterostructure.

The invention provides a preparation method and application of a cobalt-based super-crosslinked polymer-based porous material for wastewater purification. According to the preparation method of the cobalt-based super-crosslinked polymer, sodium borohydride / potassium borohydride is used as a reducing agent to reduce cobalt nitrate, so that cobalt is loaded on the surface of the super-crosslinked polymer to obtain a composite material of the super-crosslinked polymer and transition metal, namely a catalytic oxidation method is introduced on the basis of adsorption, PMS is activated through the transition metal to generate free radicals, and the cobalt-based super-crosslinked polymer is obtained. The removal effect of the super-crosslinked polymer on the anion organic pollutant brilliant blue is further improved. The invention verifies that the cobalt-based super-crosslinked polymer has good adsorption and degradation properties on various pollutants. The invention researches the application of the adsorption-degradation system of the cobalt-based super-crosslinked polymer in the actual water body, and the experimental result shows that the adsorption-degradation system has a good removal effect on the anion organic pollutants and has the potential of removing the anion organic pollutants in the actual water environment.

This invention discloses a bimetallic complex with whitening and anti-aging effects, its preparation method, and its application, belonging to the field of biomaterial preparation technology. The preparation method includes S1, dissolving an amino acid in water to obtain solution A; S2, dissolving a metal salt in ethanol to obtain solution B; S3, mixing solutions A and B evenly, and then reacting them through a solvothermal reaction to obtain solution C; S4, washing and drying solution C to obtain the final product. The amino acid in step S1 is at least one of glutamic acid and aspartic acid; the metal salt in step S2 is copper acetate and zinc acetate, copper acetate and manganese chloride, or copper acetate and cobalt nitrate; the solvothermal reaction conditions in step S3 are: temperature 60-110℃, reaction time 2-48h. The prepared bimetallic complex has both whitening and anti-aging effects, providing a new direction for the application of BioMOFs materials.

The invention discloses a cobalt molybdenum oxide catalyst, a preparation method thereof and a method for preparing propylene by catalyzing oxidative dehydrogenation of propane. The invention aims to provide a preparation method of a cobalt-molybdenum oxide catalyst, and the cobalt-molybdenum oxide catalyst has relatively high selectivity for catalyzing oxidative dehydrogenation of propane to prepare propylene under a low-temperature condition. The technical scheme is as follows: (1) preparing a cobalt nitrate hexahydrate aqueous solution; (2) adding sodium molybdate dihydrate into the cobalt nitrate hexahydrate aqueous solution, and stirring for 30 minutes at normal temperature; (3) slowly dropwise adding the mixed solution to AlOOH powder drop by drop and stirring; (4) putting the mixed paste into a ball milling tank for ball milling for 4 hours; (5) centrifugally drying to obtain a solid product; and (6) calcining the solid product at 500 DEG C for 4 hours to obtain a finished product. Belongs to the technical field of thermocatalytic materials and environmental protection.

The invention discloses a CoS2 (at) TCPP-Co nano composite material as well as a preparation method and application thereof, and relates to the technical field of rapid detection of nano enzyme materials and efficient degradation of fungaltoxin. The preparation method of the CoS2 (at) TCPP-Co nano composite material comprises the following steps: dissolving cobalt nitrate and sodium thiosulfate in water, adding ethylene glycol and ethanol, stirring and heating to react, centrifuging, washing and drying a solid to obtain CoS2. The preparation method comprises the following steps: dissolving tetra (4-carboxyl phenyl) porphin and polyvinylpyrrolidone in N, N-dimethylformamide and absolute ethyl alcohol, uniformly mixing, adding CoS2, carrying out a constant-temperature reaction, and finally centrifuging, washing and drying to obtain the CoS2 atTCPP-Co nano composite material. The composite material shows excellent peroxidase-like activity, and can be coupled to a ligand to realize rapid quantitative detection of AFB1. In addition, reactive oxygen free radicals generated by the CoS2 (at) TCPP-Co in the catalytic reaction can efficiently destroy the molecular structure of AFB1, so that effective degradation of the toxin is realized.

The invention discloses a preparation method and application of a superfine hollow CoSenanoneedle material. The method comprises the following steps: (1) mixing and dissolving cobalt nitrate, urea and ammonium fluoride, adding foamed nickel, preserving heat at 110-130 DEG C for 7-9 hours, cooling to room temperature, taking out the reacted foamed nickel, cleaning and drying to obtain a precursor; (2) mixing and dissolving selenium powder and sodium hydroxide, preserving heat at 190-210 DEG C for 7-9 hours, and cooling to room temperature to obtain an intermediate solution; and (3) putting the precursor into the intermediate solution, preserving heat at 140-160 DEG C for 7-9 hours, cooling to room temperature, taking out the reacted foamed nickel, cleaning and drying to obtain the superfine hollow CoSenanoneedle material. The nanoneedles directionally grow from the foamed nickel substrate to form a flower-cluster-shaped multilevel structure, so that the conductivity and the structural stability of a foamed nickel three-dimensional porous framework are reserved, and more catalytic active sites are exposed through the high specific surface area of the hollow nanoneedles.

The invention relates to the technical field of bimetallic catalysts, in particular to a bimetallic catalyst for catalyzing epoxide, which is prepared from the following raw materials: activated carbon, titanium tetrachloride, cobalt nitrate, cerium nitrate, glacial acetic acid and deionized water. The composite material comprises the following components in parts by weight: 80 parts of activated carbon; the proportion of the titanium tetrachloride is 4 parts; the proportion of the cobalt nitrate is 6 parts; the proportion of the cerium nitrate is 10 parts; the proportion of the glacial acetic acid is 20 mL; the proportion of the deionized water is 50 mL, and the glacial acetic acid and the deionized water are additionally added and do not account for the total amount; the method further comprises the following steps: 1, deeply pretreating the activated carbon carrier; 2, preparing an active component solution; step 3, breaking a sol aggregate; step 4, aging and drying; 5, roasting and activating; step 6, forming and screening; the invention aims to solve the problems encountered in the existing material through bimetallic collaborative design, carrier structure regulation and control, load process innovation and roasting system optimization.

The application belongs to the technical field of biological medicine, and particularly relates to a one-step preparation method of a dopamine polymer with near-infrared II region light absorption capacity and application thereof. The preparation method comprises the following steps: dissolving cobalt nitrate in an ethanol aqueous solution containing 2-methyl imidazole, adding dopamine hydrochloride into the solution, stirring at room temperature, carrying out the reaction through a water heating or ultrasonic method for a period of time, and obtaining the dopamine polymer after the reaction is completed. The material has strong light absorption characteristics in the near-infrared II region through a simple synthesis method, has adjustable photothermal and photodynamic dual functions, and has excellent sterilization capacity.

The application relates to a magnetic cobalt-aluminum layered double hydroxide composite catalyst, a preparation method thereof and application of the catalyst in degradation of pesticides, and belongs to the field of environmental catalytic materials and water treatment technologies. The catalyst is composed of Fe3O4 superparamagnetic nanoparticles and Co5Al layered double hydroxide. Aluminum nitrate and cobalt nitrate are added into deionized water, then ammonium fluoride, urea and Fe3O4 superparamagnetic nanoparticles are added and ultrasonic dispersion is carried out, the obtained mixed solution is subjected to hydrothermal reaction, and after cooling, washing and drying, the catalyst is obtained. When used, the catalyst is added into water containing pesticides, peroxymonosulfate is added for oscillation reaction, and finally the catalyst is separated through an external magnetic field. The catalyst can be quickly separated and recovered through an external magnetic field, has good repeated use performance, good chemical stability and structural stability, high catalytic activity and strong anti-interference ability. The catalytic system reaction mechanism of the application is clear, and the free radical route is dominant, so that the degradation thoroughness and reliability are ensured.

The application discloses a preparation method and application of a cellulose-based material loaded cobalt-doped metal organic framework compound catalyst. The composite catalyst takes a cellulose-based material as a carrier, and is subjected to hydrothermal treatment together with an aqueous solution of ferric chloride hexahydrate and fumaric acid, so as to obtain a metal organic framework compound MIL-88A which is in-situ grown on the cellulose-based material, and then the MIL-88A is subjected to freeze drying. After the treatment, the obtained cellulose-based material loaded MIL-88A is added into a mixed aqueous solution of cobalt nitrate nonahydrate and urea, and is subjected to water bath treatment at 90 DEG C, and then the cellulose-based material loaded MIL-88A obtained after the treatment is subjected to freeze drying, so as to obtain the cellulose-based material loaded cobalt-doped MIL-88A catalyst. The prepared heterogeneous catalyst can efficiently degrade dyes by activating potassium monopersulfate. The catalyst is easy to recover, and can be used in an intermittent or continuous dye degradation process. In the continuous degradation of a dye rhodamine B, when the flow rate is 6 ml / h, the catalyst can still maintain high catalytic degradation activity for 72 h.

This invention discloses a Pt-CoMo-NC hollow structure catalyst for hydrogen production from ammonia borosilicate hydrolysis and its preparation method. The preparation method includes: dissolving cobalt nitrate in methanol; dissolving 2-methylimidazole in another methanol solution; rapidly adding the cobalt nitrate methanol solution to the 2-methylimidazole methanol solution under stirring, continuing stirring at 25-30℃ for 10-72 h, centrifuging, washing, and vacuum drying to obtain ZIF-67 powder; completely dissolving a Mo source and chloroplatinic acid in a solvent, adding the ZIF-67 powder to the solution under stirring at 20-35℃, and continuing stirring at this temperature for 10-60 min; continuously stirring at 60-80℃ until the solvent is completely evaporated to obtain MoPt / ZIF-67; and carbonizing MoPt / ZIF-67 in an inert gas at a temperature of 500-950℃ to obtain the Pt-CoMo-NC catalyst. This catalyst exhibits excellent performance in catalyzing the hydrogen production from ammonia borosilicate hydrolysis and has promising application prospects.

The application discloses a ZnNiCo-LDH with a hollow nanometer cage structure, and a ZIF-67 with a regular dodecahedron structure is synthesized by taking cobalt nitrate and 2-methyl imidazole as raw materials; a ZIF-67@NiCo-LDH with a core-shell structure is prepared by ZIF-67 and Ni(NO3)2.6H2O; and the ZnNiCo-LDH with the hollow nanometer cage structure can be obtained by the reaction of zinc chloride and the ZIF-67@NiCo-LDH. The preparation method comprises the following steps: 1, preparation of the ZIF-67 with the regular dodecahedron structure; 2, preparation of the ZIF-67@NiCo-LDH with the core-shell structure; and 3, preparation of the ZnNiCo-LDH with the hollow nanometer cage structure. As the application of the super capacitor, the specific capacitance is 1900-2000 F / g when charging and discharging in the range of 0-0.5 V and the discharge current density is 1 A / g; and the capacitance retention rate reaches 73% at 10 A / g relative to the capacitance at 1 A / g.

The invention provides a preparation method of micro-powder-free cobalt hydroxide, belongs to the technical field of lithium ion battery material preparation, and solves the problems that the content of micro powder is high and the synthesis process is difficult to control when the cobalt hydroxide is prepared in the prior art. The method comprises the following operation steps: preparing a solution, carrying out a synthetic reaction, aging, washing, drying and the like, and synthesizing a crimson beta-type cobalt hydroxide product with a product index D0 greater than or equal to 3 microns and regular morphology by controlling the temperature of a synthetic raw material solution at-5 to + 5 DEG C and controlling proper synthesis conditions. The cobalt hydroxide prepared by the method is regular in microstructure, does not contain fine micro-powder particles, and can be used for preparing cobaltosic oxide required by high-voltage lithium cobalt oxide.

The invention discloses a variable-valence tin-cobalt oxide hydrogen-sensitive material as well as a preparation method and application thereof. According to the invention, Sn (OC4H9) 4 and cobalt nitrate are adopted as raw materials to prepare a solution, ammonia water is added to adjust the pH and serve as a weak reducing agent, and the obtained solution is subjected to hot reflux treatment to obtain a precursor solution; performing heat treatment on the precursor solution to obtain solid powder; and sintering the solid powder in an inert-H2 mixed atmosphere to obtain the variable-valence tin-cobalt oxide hydrogen sensitive material, namely a Co3O4-SnOx sensitive material. The material is large in specific surface area, adjustable in cobalt ion valence and high in oxygen defect distribution density, has the outstanding advantages of low working temperature, high sensitivity, good hydrogen selectivity and the like, and is particularly suitable for being applied to high-sensitivity, low-power-consumption and safe detection sensors required by hydrogen detection.

This invention provides a lithium-ion battery cathode material, its preparation method, and its application. The raw materials for preparing the cathode include acetylene black, nitric acid solution, cobalt nitrate solution, polytetrafluoroethylene emulsion, water, isopropanol, and copper chloride. This invention uses electrostatic adsorption to uniformly load cobalt ions onto the surface of acetylene black, followed by oxidation treatment to obtain an acetylene black / cobalt tetroxide composite material with uniform dispersion characteristics. Furthermore, by employing a solution impregnation method using fibrous powder materials, and placing them in a copper chloride / isopropanol system for static treatment, not only is spontaneous and uniform adsorption of copper chloride achieved, but the localized catalyst enrichment problem easily caused by traditional mechanical stirring methods is also avoided, significantly improving the dispersion uniformity of the active catalytic components.

The application discloses a kind of cathode material for low-temperature metal fuel cell and its preparation method and application, preparation nitrogen-doped carbon nanotube as carrier;Utilize the liquid phase oxidation-reduction method of potassium permanganate and manganese sulfate, and introduce cobalt nitrate to carry out one-step hydrothermal synthesis;Utilize the doping effect of cobalt ion to control product crystal phase, and synthesize the rod-shaped structure of MnOOH and CoMn2O4 Nanocomposite on carrier.The obtained cathode material is through the synergistic effect of nitrogen-doped carbon carrier and metal oxide, significantly reduce the energy barrier of low-temperature oxygen reduction reaction.The cathode material has 0.79 V half-wave potential and 5.58 mA·cm ‑2 Limit diffusion current density under-10 ℃ environment;The assembled aluminum-air battery shows 1.56 V open-circuit voltage and 9.71 mW·cm ‑2 Power density under-40 ℃ environment, can be discharged stably for 16.2 h under 2 mA·cm ‑2 Current density, better than commercial Pt / C catalyst.In cold region emergency power supply, polar scientific expedition, military equipment and other extreme low-temperature scenes have significant application value.

The invention belongs to the technical field of microalgae culture, and particularly provides an improved culture solution for haematococcus pluvialis culture and a preparation method thereof. The culture solution is prepared from 1.5 to 2.5 mg / L of alpha-cyclodextrin embedded sodium acetate, 0.5 to 0.5 mg / L of cobalt nitrate hexahydrate, 0.05 to 1 mg / L of copper sulfate, 0.3 to 0.9 mg / L of zinc sulfate heptahydrate, 1.5 to 2.5 mg / L of manganese chloride tetrahydrate, 3 to 7 mg / L of boric acid, 8 to 20 mg / L of sodium carbonate, 10.0 to 20.0 mg / L of disodium hydrogen phosphate dihydrate, 1200 to 1400 mg / L of sodium nitrate, 0.5 to 3 mg / L of EDTA (Ethylene Diamine Tetraacetic Acid), 20 to 50 mg / L of calcium chloride, 70 to 100 mg / L of magnesium sulfate heptahydrate, 50 to 80 mg / L of monopotassium phosphate trihydrate, 0.5 to 1.0 mg / L of ferrous sulfate heptahydrate and 0.01 to 0.03 mg / L of ammonium molybdate tetrahydrate. According to the invention, alpha-cyclodextrin is introduced to embed sodium acetate, ferrous sulfate heptahydrate and ammonium molybdate tetrahydrate are added, and a sodium carbonate-disodium hydrogen phosphate-potassium dihydrogen phosphate composite buffer system is constructed, so that the problem of easy imbalance of traditional carbon source supply is solved, and the defect of single and short elements of a traditional formula can be overcome; pH fluctuation caused by cell metabolism acid production during high-density culture can be effectively coped with, it is ensured that cells are always in a suitable acid-base environment, and nutrient absorption and metabolism pathways are stabilized.

Provided is a method for producing a catalyst having excellent catalytic activity and yield, which is used in a method for producing propenal and acrylic acid by catalytic gas-phase oxidation of propylene. The method for producing the catalyst is a method for producing a catalyst for producing propenal and acrylic acid by catalytic gas-phase oxidation of propylene, which includes a step of mixing a raw material mixture of a raw material compound containing molybdenum, a raw material compound of bismuth, and a raw material compound of cobalt, the raw material compound of cobalt being cobalt nitrate hexahydrate, the mass loss rate L1 of the cobalt nitrate hexahydrate in thermogravimetric analysis from 25°C to 105°C being 11 to 16 mass%.

The application adopts microwave pyrolysis of waste plastic polyethylene terephthalate (PET) to prepare porous carbon catalytic material, and applies it to peroxymonosulfate (PMS) catalytic activation to degrade organic pollutants such as carbamazepine (CBZ). Microwave absorber cobalt nitrate and initial carbonized alpha-cellulose are used to assist the carbonization of waste plastic PET, and thiourea is used as a metal sulfidation reagent to prepare the waste plastic derived porous carbon material catalyst in a commercial microwave oven with a power of 800W for 10 minutes. The formation of cobalt oxide, the generation of cobalt sulfide, the introduction of C=O and oxygen vacancies, and the increase of specific surface area are all conducive to the improvement of the degradation performance of the catalyst to organic pollutants. The best catalyst S 0.3 -Co@P2C can achieve 100% CBZ degradation in 15 min, and the rate constant is 0.7445 min ‑1 . Compared with the traditional pyrolysis method, the microwave treated carbon material is not only more conducive to the formation and exposure of active sites (CoS and CoO) in the catalytic material, but also conducive to the generation of SO4 •‑ ·OH, O2 •‑ and 1 O2 by PMS catalytic activation. In addition, the introduction of PET is conducive to the formation of C=O in the catalytic material to promote PMS activation and accelerate the non-radical pathway to degrade CBZ.

The invention provides a bimetallic nitride catalyst and a preparation method and application thereof, and relates to the technical field of catalysts.The preparation method comprises the steps that ferric nitrate and soluble starch are added into water and stirred to be gelatinized, and gelatinized liquid is obtained; adding zinc nitrate, dicyandiamide and cobalt nitrate into the gelatinized liquid, and uniformly stirring to obtain hydrogel; the hydrogel is subjected to freeze drying, and aerogel is obtained; the aerogel is placed in an ammonia atmosphere, heat preservation is conducted for 2-6 h at the temperature of 850-950 DEG C, the bimetallic nitride catalyst containing the iron-cobalt nitride is obtained, and the bimetallic nitride catalyst is high in oxygen reduction reaction activity and cycling stability.