115 results about "Potassium cyanide" patented technology

The invention discloses a high-crystallinity carbon nitride nanosheet based on a heterogeneous fused salt interface as well as a preparation method and application thereof, and belongs to the technical field of photocatalysis. The preparation method comprises the following steps: carrying out hydrothermal reaction on a melamine solution or a melamine mixed solution to obtain a supramolecular precursor; mixing the supramolecular precursor with heterogeneous molten salt, and calcining in a protective atmosphere to obtain the high-crystallinity carbon nitride nanosheet; the heterogeneous molten salt is a mixture of potassium thiocyanate and potassium chloride. The heterogeneous fused salt interface is used as a reaction environment, ideal interface driving force is provided for directional assembly of a precursor and formation of a high-crystallization carbon nitride nanosheet, then preparation of a carbon nitride photocatalytic material with a controllable structure and excellent performance is achieved, and an illumination reaction is carried out in an air environment to catalyze production of hydrogen peroxide.

The invention relates to the technical field of non-metallic material preparation, solar energy utilization and green energy production, in particular to a carbon nitride dark photocatalyst as well as a preparation method and application thereof. The preparation method of the carbon nitride dark photocatalyst comprises the following steps: calcining melamine I to obtain common carbon nitride; grinding and uniformly mixing the common carbon nitride and potassium thiocyanate to obtain a precursor mixture; calcining the precursor mixture II to obtain a carbon nitride dark photocatalyst precursor; and adding the carbon nitride dark photocatalyst precursor into water for soaking and stirring, then carrying out solid-liquid separation, and sequentially washing and drying the obtained solid to obtain the carbon nitride dark photocatalyst. The carbon nitride dark photocatalyst can produce hydrogen peroxide in the dark. The limitation that a traditional photocatalyst cannot react under the dark condition is solved, and the photocatalyst can be used as an efficient hydrogen peroxide production catalyst to be applied to clean energy production and has a good application prospect.

The invention discloses a catalyst Cr, Co-Ni (OH) 2 (at) NF based on a nickel base. The catalyst is prepared by taking foamed nickel (NF) as a carrier and doping Cr and Co elements, has efficient urea oxidation reaction (UOR) performance, and can be used for hydrogen production by electrolysis of water and urea pollution treatment. The preparation method comprises the following steps: soaking nickel foam in an HCl solution, soaking the nickel foam in a nickel salt solution with a specific concentration for reaction to generate nickel-based hydroxide, and soaking the nickel-based hydroxide in a solution containing chromic nitrate and cobalt potassium cyanide for reaction to finally generate the catalyst doped with Cr and Co. The catalyst shows low overpotential and good stability in a 1M KOH + 0.33 M urea solution, the overpotential of an anode for hydrogen production through electrolysis of water is remarkably reduced, and meanwhile efficient degradation of urea is achieved.

The invention discloses an octadecahedral cerium-cobalt composite oxide lithium battery negative electrode material and a preparation method thereof, and the preparation method comprises the following steps: dissolving cerium salt in absolute ethyl alcohol to prepare a cerium salt alcoholic solution; the preparation method comprises the following steps: dissolving cobalt potassium cyanide in water to prepare a cobalt salt solution, and sequentially adding glucose and sodium carboxymethyl cellulose to obtain a mixed aqueous solution containing glucose, sodium carboxymethyl cellulose and cobalt salt; mixing the two solutions, stirring to obtain white precipitate, centrifugally separating, washing with ethanol for three times, and drying to obtain a white cerium-cobalt precursor; and placing the obtained cerium-cobalt precursor in a crucible with a cover, wrapping the cerium-cobalt precursor with a thin foil, carrying out high-temperature calcination in a muffle furnace, and naturally cooling to obtain the octadecahedral cerium-cobalt composite oxide. The octadecahedral cerium-cobalt composite oxide negative electrode material disclosed by the invention has a special microstructure, relatively good charge-discharge capacity and good cyclicity.

This invention discloses a method for recycling and reusing cyanide silver plating wastewater. The method includes four steps: separation of silver ions and cyanide, concentration of the silver-containing solution, cyanide concentration, electrolysis and residual liquid recycling, and reuse of reclaimed water. This method achieves the separate recycling and reuse of silver, cyanide, and water. The silver-containing solution is electrolyzed to obtain metallic silver, the cyanide concentrate's main component is sodium cyanide or potassium cyanide solution, and the reclaimed water with a conductivity below 20 μS / cm is reused in the production line. This method not only maximizes resource utilization and reduces wastewater discharge, but also separates most of the cyanide from the silver-containing solution during electrolysis, making the electrolysis process safer. Furthermore, the residual liquid after electrolysis can be recycled multiple times for the separation and concentration of silver ions and cyanide.

The invention relates to the technical field of oxygen free radical detection, in particular to a manufacturing process of a portable and reliable oxygen free radical detector. Comprising the following steps: mixing superoxide dismutase, potassium ferricyanide, an isothiazolinone preservative, hexammine ruthenium chloride, polyethylene glycol octylphenol ether, trehalose and bovine serum albumin, and uniformly stirring to prepare an enzyme preparation; mixing an enzyme preparation with the high polymer material solution to form reagent layer slurry with viscosity; uniformly coating the reagent layer slurry on a substrate material, and drying; printing an electrode material on the substrate material to form a working electrode and a counter electrode; the silver electrode is placed in an electrolyte containing chloride ions, potential is applied, the silver surface is subjected to a chlorination reaction, and a silver / silver chloride electrode is formed; covering the reagent layer above the electrode, tightly combining the reagent layer with the electrode in a sticking or hot pressing manner, and cutting to obtain the test paper; the prepared portable oxygen free radical detector can be used for conveniently and efficiently detecting oxygen free radicals of a human body at low cost.

The invention discloses a preparation method of a potassium-doped nitrogen oxidation phosphorescent catalyst, and belongs to the technical field of photocatalytic material preparation. The method comprises the following steps: by taking phosphorus oxynitride and potassium thiocyanate as raw materials, grinding and mixing, carrying out molten salt reaction at 400-600 DEG C for 1-5 hours, and cooling, washing and drying a reaction product to obtain the potassium-doped phosphorus oxynitride crystal. The method is simple in process, mild in reaction condition, low in cost and easy for large-scale production. Through potassium element doping, the visible light absorption range of phosphorus oxynitride is effectively widened, the recombination rate of photo-induced electron-hole pairs is remarkably reduced, and the carrier separation and transmission efficiency is improved, so that the photocatalytic activity of the material is greatly improved. The prepared K-PON photocatalyst has wide application prospects in the fields of photocatalytic reduction of uranium-containing wastewater, degradation of organic pollutants, energy conversion and the like.

The invention relates to a preparation method of a layered magnesium-based flame-retardant smoke-suppression hybrid material, which comprises the following steps: (1) dispersing organic anion intercalated magnesium-based LDHs into a Tris-HCl buffer solution with the pH value of about 8.5 to obtain slurry A; then adding bio-based polyphenol into the slurry A, continuously stirring, and carrying out suction filtration, washing and freeze drying to obtain organic anion intercalation magnesium-based LDHs coated with polyphenol on the surface; (2) dispersing the organic anion intercalation magnesium-based LDHs coated with polyphenol on the surface into deionized water, then adding soluble cobalt salt, soluble nickel salt and sodium citrate, and continuously stirring to obtain slurry B; and (3) adding a transition metal potassium cyanide solution into the slurry B under continuous stirring, then aging, and carrying out suction filtration, washing and freeze drying to obtain the layered magnesium-based flame-retardant and smoke-suppression hybrid material. The method is simple, low in cost and easy to implement, and the obtained material solves the problems that an anchored transition metal compound is large in particle size, uneven in distribution, lack of synergistic effect and the like.

The application relates to the technical field of sodium ion battery negative electrode materials, and discloses a preparation method and application of a copper-iron sulfide / nitrogen-doped porous carbon composite material, which comprises the following steps: (1) mixing copper salt, potassium ferricyanide, a nitrogen source and polyethylene glycol, and obtaining a copper-iron Prussian blue precursor after ball milling; (2) pyrolyzing the copper-iron Prussian blue precursor under an inert atmosphere, washing and removing impurities, and drying to obtain an intermediate product; and (3) heat-treating the intermediate product and a sulfur source under an inert atmosphere to obtain a copper-iron sulfide / nitrogen-doped porous carbon composite material. Through the synergistic effect of the double-metal sulfide and the nitrogen-doped porous carbon composite, sodium ions with a larger ion radius can be more easily embedded and de-embedded in the interlayer spacing, meanwhile, abundant active sites are provided to enhance ion storage, so that the sodium ion battery has outstanding rate performance and stable cycle performance.

The invention provides a Prussian blue analogue derivative Ce-doped Co-based catalyst and a preparation method thereof.The preparation method comprises the steps that cerium salt and cobalt salt are dissolved and mixed to prepare a mixed solution, cobalt potassium cyanide solution is prepared, the cobalt potassium cyanide solution is dropwise added into the mixed solution, and the Prussian blue analogue derivative Ce-doped Co-based catalyst is obtained after the cobalt potassium cyanide solution is dropwise added into the mixed solution; the Ce-doped Co-based catalyst is prepared by dropwise adding a mixed solution or a cobalt cyanide potassium solution, adding polyvinylpyrrolidone into the mixed solution or the cobalt cyanide potassium solution before dropwise adding to further regulate and control the reaction rate, carrying out stirring reaction and aging to obtain a metal organic framework precursor with an irregular morphology, and finally calcining to obtain the Ce-doped Co-based catalyst. Based on earlier-stage scientific achievements, when cobalt salt is additionally added to regulate and control the proportion of Ce and Co elements, it is accidentally found that when other cobalt salt and cerium salt coexist, Co-Co coordinated Ce-doped irregular-morphology Prussian blue analogues can be formed, and under the specific Ce and Co element proportion condition, the Prussian blue analogues can be used for preparing the Prussian blue analogues with the Co-Co coordinated Ce-doped irregular-morphology Prussian blue analogues with the Co-Co coordinated Ce-doped irregular-morphology Prussian blue analogues. And after being calcined, the catalyst has obviously higher ammonia decomposition conversion rate under a relatively low-temperature condition.

The invention discloses a bimetallic catalyst and a method for preparing polyether polyol by using the bimetallic catalyst, and relates to the technical field of polyether polyol preparation.The method comprises the steps that an ethylenediaminetetraacetic acid-crown ether covalent ligand is taken and added into absolute ethyl alcohol, a cobalt potassium cyanide solution is slowly and dropwise added, the mixture is stirred to be uniform, then a manganese-cobalt bimetallic catalyst precursor is slowly and dropwise added, stirring and centrifuging are conducted, and a precursor solution is obtained; and washing and drying in vacuum to obtain the manganese-cobalt bimetallic catalyst. Taking a manganese-cobalt bimetallic catalyst, adding the manganese-cobalt bimetallic catalyst into absolute ethyl alcohol, then adding the zinc-nitrogen co-doped charcoal, and carrying out ultrasonic treatment; stirring, centrifuging, alkali washing and vacuum drying are performed to obtain the bimetallic catalyst. The preparation method comprises the following steps: enabling propylene oxide to pass through a molecular sieve, uniformly mixing a bimetallic catalyst, 1, 4-butanediol and polyglycerol, and carrying out gas replacement; and adding epoxypropane, adding epoxypropane in batches when the pressure in the kettle is reduced to half of the initial pressure, and removing impurities to obtain the polyether polyol.

The present invention discloses a cyanase mutant, nucleic acid, recombinant expression vector and their applications, belonging to the field of bioengineering. The cyanase gene derived from Escherichia coli E. coli K-12 substr. MG1655 was subjected to site-directed mutagenesis, so that the encoded amino acid sequence was mutated from glycine G to alanine A at the 37th position, from lysine K to arginine R at the 154th position, and from glutamine Q to histidine H at the 51st position. The specific activity of the cyanase mutant G37A / K154R / Q51H of the present invention against potassium cyanate is 2.4 times that before mutation, and the half-lives at 30 °C and 40 °C are increased by 2.1 times and 2.6 times respectively. The cyanase parent of the present invention cannot catalyze potassium cyanide, while the specific activity of the mutant G37A / K154R / Q51H against potassium cyanide reaches 5.5 U / mg, and the half-lives at 30 °C and 40 °C are 2.5 h and 3.0 h respectively. The cyanase mutant of the present invention can efficiently catalyze the decomposition of the substrates potassium cyanate and potassium cyanide, so as to achieve the purpose of degrading cyanide-containing wastewater, and can be widely applied to industries such as chemical engineering, pharmaceuticals and metallurgy, and has broad application prospects.

The invention discloses a preparation method of a cubic sulfide composite positive electrode material for a sodium-magnesium hybrid battery, which comprises the following steps of: 1, preparing a solution A from a cobalt source, preparing a solution B from cobalt potassium cyanide and a complexing agent, stirring the solution A and the solution B, standing, aging, washing and drying to obtain Co-PBA; 2, adding Co-PBA into a tris (hydroxymethyl) aminomethane buffer solution, adding a surfactant, carrying out ultrasonic treatment, adding dopamine hydrochloride, stirring, washing and drying to obtain a Co-PBA (at) PDA composite material; and 3, grinding the Co-PBA (at) PDA composite material, carrying out in-situ carbonization sintering, mixing with sulfur powder, and carrying out secondary sintering. The constructed polydopamine-coated Prussian blue analogue with the cubic structure is subjected to in-situ carbonization and vulcanization, the obtained CoS2 composite positive electrode material is uniform in particle size, stable in structure and excellent in electronic conductivity, the electrochemical performance including reversible capacity, cycling stability and rate capability is improved, and the CoS2 composite positive electrode material is suitable for a sodium-magnesium hybrid battery.

The invention relates to the field of compound preparation, and discloses a method for preparing alkali metal ferrocyanide by using iron powder as an iron source through a mechanochemical method, and the method comprises the following steps: mixing the iron powder with a solution containing alkali metal cyanide to obtain a mixture, and enabling the water content of the mixture to be not more than 50wt%, the alkali metal cyanide comprises sodium cyanide or potassium cyanide, the reaction time is short, the reaction temperature is low, the process of treating the raw materials in advance is omitted, hydrolysis of the sodium cyanide is reduced, side reactions are reduced, a small amount of NH3 is released in the complexing reaction process, and the method is suitable for industrial production. The yield is high, sulfate containing ferrocyanide is not produced as a byproduct, and unreacted metal residues are recycled. Compared with a traditional method, the method disclosed by the invention is low in production cost and high in added value of products, and has a relatively good industrial prospect.

The present application relates to oxygen precipitation and oxygen reduction electrocatalyst technical field, especially an accordion type carbon supported single atom-cluster catalyst and preparation method and application. The present application first synthesizes a kind of accordion type coordination polymer containing zinc and iron series metal (such as iron, cobalt, nickel), then it is etched using potassium ferricyanide or potassium cobalticyanide;Finally, pyrolysis is carried out under nitrogen atmosphere, forming an accordion type carbon supported single atom-cluster catalyst. The new catalyst has a unique accordion type layered structure, higher specific surface area, more active sites, and the main skeleton nitrogen-doped carbon of the catalyst has good conductivity, which can accelerate the mass transfer and charge transfer process of electrocatalytic reaction. The present application belongs to a new type of bifunctional catalyst, which can catalyze oxygen reduction reaction and drive oxygen precipitation reaction, meet the needs of rechargeable zinc-air battery, and show potential application prospect to replace commercialized noble metal catalyst.

The invention discloses a medium-entropy nickel-based metal organic framework nano-array electrode and a preparation method and application thereof, and relates to the technical field of electrodes, the medium-entropy nickel-based metal organic framework nano-array electrode comprises a conductive net-shaped substrate and a medium-entropy nickel-based metal organic framework nanosheet loaded on the conductive net-shaped substrate, the medium-entropy nickel-based metal organic framework nanosheet is loaded on the conductive net-shaped substrate, and the medium-entropy nickel-based metal organic framework nanosheet is loaded on the medium-entropy nickel-based metal organic framework nano-array electrode. The medium-entropy nickel-based metal organic framework nanosheet is composed of a ligand prepared from nickel potassium cyanide and metal nodes, wherein the metal nodes are prepared from Ni < 2 + > and two or three metal ions selected from Co < 2 + >, Fe < 3 + > and Cr < 3 + >; the preparation method of the electrode is simple and efficient, the used raw materials are metal soluble salt and nickel potassium cyanide, and compared with a noble metal-based catalyst in industrial application, the electrode is low in cost, can be directly used as a self-supporting electrode for electrocatalytic urea oxidation reaction and is excellent in performance.

The application discloses a processing technology of ethyl dicyanopropionate, and comprises the following specific steps: S1, preparing raw materials, storing liquid raw materials uniformly for standby, and placing solid raw material ethyl cyanoacetate in a humid environment with certain humidity to make it lump; S2, pre-treating the lumped ethyl cyanoacetate by using a pre-treatment device, and then crushing the lumped ethyl cyanoacetate after component separation; S3, mixing the ethyl cyanoacetate with a potassium cyanide solution, and then slowly adding a formaldehyde solution into the mixture for reaction; S4, separating the organic layer from the reaction liquid, extracting the water layer by using a solvent dimethyl sulfoxide, mixing the organic layers, and finally obtaining ethyl dicyanopropionate finished products after drying and desolventizing; in the step S2, the pre-treatment device comprises a storage mechanism, a high-frequency vibration device and an ejection mechanism; the processing technology of ethyl dicyanopropionate disclosed by the application has the effect of reducing the exposure amount of dust, thereby providing effective protection for the personal safety of workers.

The present invention discloses a method for preparing an α-arylimino aryl acetonitrile derivative, comprising the following steps: (1) using ethanol as a solvent, mixing an aromatic aldehyde and an aromatic amine to react to generate a Schiff base compound; (2) using cesium carbonate as a base, anhydrous N,N-dimethylformamide as a solvent, and malononitrile as a cyanogen source to mix with the Schiff base compound generated in step (1), heating to 90-100° C., and reacting for 7-8 hours to obtain an α-arylimino aryl acetonitrile derivative. The method synthesizes a target compound by reacting aromatic aldehyde, aromatic amine, and malononitrile under the action of cesium carbonate. The method has the advantages of simple reaction steps, using a green cyanogen source malononitrile, avoiding the use of highly toxic reagents such as potassium cyanide and trimethylsilyl cyanide, convenient post-processing, high product regioselectivity, and being able to effectively construct the basic skeleton of the α-arylimino aryl acetonitrile.

The invention relates to a preparation method of a high-efficiency magnesium-based composite flame retardant, which comprises the following steps: step 1, adding magnesium borate whiskers and bio-based polyphenol into an aqueous solution with the pH value of about 8.5, continuously stirring for 12-24 hours, and carrying out suction filtration, washing and freeze drying to obtain bio-based polyphenol activated magnesium borate whiskers; 2, the bio-based polyphenol activated magnesium borate whiskers, soluble nickel salt and sodium citrate are added into deionized water, a transition metal potassium cyanide solution is added under continuous stirring, then aging is conducted for 18-30 h, suction filtration, washing and freeze drying are conducted, and the magnesium-based composite flame retardant is obtained. The method is simple, low in cost and easy to implement, the density of surface active groups of the magnesium borate whiskers can be increased, and the catalytic char forming capacity can be improved.

The invention discloses a dustproof anti-static artificial terrazzo and a preparation method thereof. The dustproof anti-static artificial terrazzo prepared by the invention is prepared from the following components: quartz stone particles, ceramic particles, cement, modified quartz sand, a dispersing agent, a defoaming agent, sulfhydrylated conductive carbon black, a multi-sulfydryl cross-linking agent, modified polyacrylic emulsion, water and dimethylphenylphosphine. The modified polyacrylic acid emulsion is obtained by polymerizing an acrylate monomer and diphenyl p-styryl phosphine, reacting with 1-[4-(chloromethyl) phenyl] ethanone, reacting with potassium cyanide and ammonium carbonate, and chlorinating and emulsifying; the modified quartz sand is prepared by grafting pretreated quartz sand with 2, 6-bis (tert-butyl)-4-(mercaptomethyl) phenol, reacting with phosphorus trichloride, and then reacting with p-hydroxystyrene; and styrene and butadiene are polymerized on the surface of the terrazzo. The dustproof anti-static artificial terrazzo prepared by the invention has good mechanical, antibacterial and anti-aging properties.

The application discloses a preparation method and application of a manganese-based Prussian blue / reduced graphene oxide composite material, and the method comprises the following steps: uniformly stirring manganese sulfate monohydrate in a polyvinylpyrrolidone aqueous solution, adding a potassium ferricyanide aqueous solution while stirring, and then standing, centrifuging, washing and drying to prepare manganese-based Prussian blue; adding the manganese-based Prussian blue and ascorbic acid into a dispersion solution of reduced graphene oxide, stirring, transferring into a high-pressure reaction kettle for hydrothermal reaction, cooling to room temperature, centrifuging, washing and drying to obtain the manganese-based Prussian blue / reduced graphene oxide composite material with a three-dimensional framework structure. The manganese-based Prussian blue / reduced graphene oxide composite material is used for preparing a positive electrode material of a water-based zinc ion battery. The conductivity of the material and the contact area of the material are significantly improved, the diffusion rate of ions is promoted, and the storage sites of zinc ions are effectively improved.

According to the micro-plastic detection method, a glassy carbon electrode is used as a working electrode, a platinum wire electrode is used as a counter electrode, an Ag / AgCl electrode is used as a reference electrode, and potassium ferricyanide / potassium ferrocyanide is used as an electrochemical signal molecule; the method comprises the following steps: putting a three-electrode system into a KCl electrolyte solution which contains a microplastic and contains a potassium ferricyanide / potassium ferrocyanide probe, connecting the three-electrode system into an electrochemical workstation, then carrying out electric incubation on a solution system by using a cyclic voltammetry method, and detecting the concentration of the microplastic by using a differential pulse voltammetry method after incubation is finished. According to the invention, the electrochemical technology is innovatively used for micro-plastic detection. By utilizing the characteristic that micro-plastic is easily adsorbed on the surface of a glassy carbon electrode, an electric incubation method is adopted to enhance adsorption and reduce response of signal molecules, so that an electrochemical sensing detection method is established. The method has the advantages of rapidness, simplicity, low cost and the like, can be used for effectively detecting the micro-plastics in a wider range and keeping good sensitivity, and has a wide application prospect.

The invention discloses an electromagnetic wave absorbent based on CeFe-PBA and a preparation method thereof, and belongs to the technical field of electromagnetic wave absorbents. The preparation method comprises the following steps: 1) adding polyvinylpyrrolidone into a cerium salt aqueous solution, uniformly mixing, and then sequentially mixing with ethanol and a potassium ferricyanide aqueous solution to prepare CeFe-PBA precursor powder; (2) the precursor powder is subjected to a carbon thermal reduction reaction, and Fe-CeO2 powder is obtained; (3) the Fe-CeO2 powder is dissolved in a Tris dilute solution, then dopamine hydrochloride is added, and Fe-CeO2 (at) PDA powder is prepared; 4, the Fe-CeO2 (at) PDA powder is subjected to a carbon thermal reduction reaction in the N2 atmosphere, and the CeO2 / Fe3C (at) C electromagnetic wave absorbent is prepared. The method is simple in technological operation, controllable in condition, stable in hollow structure, high in conversion rate and good in repeatability, and the obtained absorbent has excellent microwave absorption performance and has industrial application prospects.

This application relates to the technical field of analytical chemistry, specifically to a vitamin B 12 The determination method comprises the following steps: taking a sample containing vitamin B 12 The test sample is added with potassium ferricyanide solution, hydrochloric acid solution and the first solvent to obtain a mixed solution, which is then dispersed at 38°C to 42°C and then kept warm at 100±2°C to obtain a test solution. The test solution is subjected to liquid chromatography analysis to determine the content of vitamin B 12 The determination method has high sensitivity, good selectivity, high safety, easy preparation, simple operation, cost saving and reliable detection results.

This invention relates to the field of flow battery technology, specifically to a neutral flow battery based on Prussian blue targeted activation and its activation threshold control method. The battery uses potassium ferrocyanide / potassium ferricyanide as the dielectric molecule, Prussian blue as the solid energy storage material, and potassium chloride as the neutral electrolyte. The different volumes of the positive and negative electrolytes constitute a capacity-limited system. Experiments determined that a potassium ferrocyanide concentration ≥0.3M is the minimum activation threshold concentration for Prussian blue, and the optimal addition amount of Prussian blue is 10%–20% of the molar amount of potassium ferrocyanide. This control method avoids ineffective accumulation of solid materials. In neutral iron-sulfur full cells, the coulombic efficiency is significantly improved from 55%–85% to 97%–98%, and remains stable within 10 cycles, effectively improving the battery's capacity, reaction reversibility, and long-term stability.

The invention belongs to the technical field of radiochemical synthesis, and particularly relates to a radioisotope carbon-14 labeled thermoplastic polyurethane elastomer hard segment material as well as a preparation method and application thereof. The carbon-14 labeled TPU hard segment material is prepared by taking [14C] potassium cyanide as a radioisotope raw material through cyanation reaction, reduction reaction, deprotection salt forming reaction and amino esterification reaction. According to the preparation method provided by the invention, the labeled site is determined, the radiochemical purity and the chemical purity are relatively high, the labeling yield is medium and slightly higher, and the obtained [14C] BDO-BDI-BDO is consistent with a standard substance through mass spectrum and nuclear magnetic analysis. Meanwhile, the nuclide carbon-14 prepared by the method is firmly marked in BDO-BDI-BDO molecules, is not easy to fall off, and can be further reacted with various high-molecular-weight polyesters or polyethers to obtain corresponding carbon-14 marked thermoplastic polyurethane elastomers, so that the corresponding carbon-14 marked thermoplastic polyurethane elastomers are used for metabolic experiment research of the materials.

The invention discloses a graphene-doped high-entropy Prussian blue analogue material as well as a preparation method and application thereof, and belongs to the technical field of materials. The preparation method comprises the following steps: preparing a high-entropy Prussian blue analogue from nickel nitrate hexahydrate, iron nitrate nonahydrate, cobalt nitrate hexahydrate, chromium nitrate nonahydrate, zinc nitrate hexahydrate, potassium ferricyanide and graphene to form a turbid liquid, collecting a solid material in the turbid liquid by using a centrifugal method, cleaning with ethanol and deionized water, and drying to obtain the high-entropy Prussian blue analogue. And drying and grinding to obtain the high-entropy prussian blue analogue material which can effectively perform electro-catalytic oxygen evolution under an alkaline condition. The graphene-doped high-entropy Prussian blue analogue is prepared by a coprecipitation method, and the method has the characteristics of simplicity in operation, short preparation period, low cost and the like, and is beneficial to popularization and application.

The invention provides a Co-C-N catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The preparation method comprises the following steps: sequentially adding cobalt potassium cyanide and zinc salt into a folic acid aqueous solution, standing to obtain yellow transparent bimetallic hydrogel, freeze-drying the yellow transparent bimetallic hydrogel to obtain xerogel, and calcining the xerogel to obtain the Co-C-N catalyst. The folic acid-zinc-cobalt bimetallic hydrogel is obtained by taking folic acid as a supramolecular gel construction framework, so that on one hand, high dispersion of active metal can be realized; on the other hand, after gel freeze drying treatment, the internal structure of the material can be kept, after further calcination, the cobalt nitride-doped two-dimensional layered carbon material Co-C-N is formed, and the cobalt nitride-doped two-dimensional layered carbon material Co-C-N is applied to aerobic oxidation of benzyl alcohol and shows excellent catalytic activity.

The present invention provides a polyaniline / Prussian blue / polyaniline composite electrode material and its preparation method and application. The preparation method comprises the following steps: (1) forming a three-electrode system with a working electrode, a reference electrode, and a counter electrode, using an electrodeposition solution as an electrolyte, and performing an electrodeposition polymerization reaction on the surface of the working electrode to form a polyaniline conductive substrate; (2) placing the working electrode with a polyaniline layer deposited on the surface in a metal salt aqueous solution, first adding sodium citrate dihydrate, and then adding a potassium ferricyanide solution for reaction, thereby forming a Prussian blue layer on the surface of the polyaniline layer; (3) forming a three-electrode system with a working electrode with a polyaniline layer and a Prussian blue layer deposited on the surface, a reference electrode, and a counter electrode, using an electrodeposition solution as an electrolyte, and performing an electrodeposition polymerization reaction on the surface of the Prussian blue layer of the working electrode to form a polyaniline protective layer; thus, the polyaniline / Prussian blue / polyaniline composite electrode material is prepared. The composite material of the present invention has a higher desalination capacity.