60 results about "Potassium cyanide" patented technology

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 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 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 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 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 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.

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 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 invention discloses a synthesis method of a C-13 labeled mercapto triazole derivative. The synthesis method comprises the following steps: (1) carrying out a reaction on C-13 potassium cyanide and S8 to prepare C-13 potassium thiocyanate; (2) carrying out nucleophilic substitution reaction on C-13 potassium thiocyanate and a benzyl bromide compound to obtain a compound 1; (3) carrying out nucleophilic addition reaction on the compound 1 and formylhydrazine to obtain a compound 2; (4) further cyclizing the compound 2 under an alkaline condition to obtain a compound 3; and (5) carrying out derivative reaction on the compound 3 to obtain a C-13 labeled target compound. According to the synthesis method, multi-step continuous reaction is adopted, operation is easy and convenient, the yield is high, and the utilization rate of the C-13 marker is greatly increased.

The application belongs to the technical field of electrochemical energy storage materials, and particularly relates to a cobalt Prussian blue positive electrode material and a preparation method and application thereof. The application uses sodium citrate dihydrate as a structure directing agent, forms a precursor solution by dissolving sodium citrate dihydrate and cobalt acetate in water together, drops the precursor solution into a potassium cobalt cyanide aqueous solution in a linear manner, stirs the reaction under a fixed rotating speed, and obtains the cobalt Prussian blue positive electrode material after freeze-drying. The application realizes precise construction of the nanostructure of the product by regulating the coordination environment of sodium citrate and cobalt ions and the dropping process. The obtained material is composed of highly dispersed and uniform nanocubes, has high crystallinity and no agglomeration. When the material is used as a positive electrode of a water-based zinc ion battery, it has high specific capacity, excellent rate performance and super-long cycle stability, and has a wide application prospect in the field of large-scale energy storage.

The invention discloses a chemical reduction gold working solution without additionally adding KCN. The working solution does not contain potassium cyanide (KCN); the gold-potassium alloy is prepared from the following components in percentage by mass or volume: gold potassium cyanide; pure water; the complexing agent comprises 8% of anhydrous sodium acetate, 6% of sodium ethylene diamine tetracetate, 3% of sodium sulfate, 2% of glycine, 0.08% of formaldehyde, 0.0002% of lead acetate trihydrate and 80.918% of water; the stabilizer comprises 2% of ethylene diamine tetraacetic acid tetrasodium salt, 1% of potassium ferrocyanide and 97% of water; the reducing agent comprises 5% of glycine, 4% of phosphoric acid, 0.8% of formaldehyde and 90.2% of water; and a pH adjusting agent. The invention further discloses a chemical gold plating method. The working solution provided by the invention does not contain potassium cyanide (KCN), so that a non-toxic chemical plating solution is realized; and meanwhile, the consistency and high stripping degree of a gold-plated layer after gold plating can be ensured.

This invention provides a sodium nitroprusside / Prussian blue / manganese composite nanozyme, its preparation method, and its application in antibacterial applications. Belonging to the field of nanomaterials technology, the preparation method involves: first, polyvinylpyrrolidone, potassium ferricyanide, and sodium nitroprusside are mixed in an acidic solution at room temperature to prepare a Prussian blue precursor solution; then, manganese acetate is added dropwise to the Prussian blue precursor solution; after high-pressure reaction, centrifugation, and freeze-drying, sodium nitroprusside / Prussian blue / manganese composite nanozyme powder is obtained. The sodium nitroprusside / Prussian blue / manganese composite nanozyme prepared by this invention possesses a synergistic antibacterial mechanism of "enzyme catalysis + photothermal / ultrasound-based kinetic therapy + NO release." Through dual regulation of NO release via laser or ultrasound, combined with photothermal and acoustic-dynamic effects, it disrupts bacterial structure and metabolism, exhibiting not only highly effective killing of Staphylococcus aureus but also clearing bacterial biofilms, effectively solving the problem of biofilm-mediated drug resistance and providing a new approach in the field of antibacterial research.

This invention discloses a sulfur-doped, supported red mud-based Prussian blue analogue photocatalyst with a wide pH range, its preparation method, and its applications. The method involves acid dissolving red mud raw material to obtain an iron-containing liquid. A sulfur-containing reducing agent and a potassium cobalt cyanide solution are then sequentially added to the iron-containing liquid for reduction and precipitation reactions. The resulting reaction product is separated into solid and liquid phases to obtain a solid product, which is then calcined under a protective atmosphere to obtain the final photocatalyst. This photocatalyst exhibits strong dispersibility, abundant active sites, stable structure, and recyclability, and can efficiently catalyze the degradation of antibiotics. Its preparation method is simple, low-cost, and suitable for industrial production.

A method for electroplating palladium-nickel alloy on the surfaces of copper and copper alloy parts comprises the steps that S1, the surfaces of the copper and copper alloy parts are degreased; s2, pre-corrosion is carried out; the part without oil stains on the surface is placed in a hydrochloric acid solution to be pre-corroded, and after corrosion is completed, the part is rapidly washed clean with running water; s3, emitting light; the pre-corroded part is placed in a mixed solution of chromic anhydride and sulfuric acid to be continuously shaken for bright dipping treatment; s4, scrubbing with magnesium oxide; degreasing cotton is soaked with water, then pasty magnesium oxide is dipped, the surface of the bright part is scrubbed, and the surface of the bright part is washed clean with deionized water; s5, weak corrosion; the part without water drops on the surface is placed in a hydrochloric acid solution to be continuously shaken for weak corrosion treatment; S6, copper plating is conducted; placing the part subjected to weak corrosion in a mixed solution composed of cuprous cyanide, potassium cyanide and sodium hydroxide for copper electroplating to obtain a part with a copper plating layer on the surface; s7, plating a palladium-nickel alloy; and S8, the part with the copper plating layer on the surface is placed in palladium-nickel alloy electroplating liquid to be electroplated with palladium-nickel alloy, and drying is conducted.

The utility model relates to the field of wastewater treatment, and discloses a sodium azide wastewater treatment system which comprises a two-stage denitrification unit, an advanced oxidation pond, a PH (Potential of Hydrogen) regulating pond, a flocculation treatment unit, a hydrolysis acidification pond, an A / O (Anaerobic / Oxic) reaction unit, an activated carbon adsorption pond, a treatment system water outlet unit and a sludge treatment unit for treating sludge which are sequentially communicated, the two-stage denitrification unit and the advanced oxidation pond are used for removing sodium azide and potassium cyanide in the wastewater; the A / O reaction unit is used for reducing the chemical oxidation amount and the total amount of total nitrogen and phosphorus in the wastewater; the flocculation treatment unit and the A / O reaction unit are both communicated with the sludge treatment unit. According to the embodiment of the invention, sodium azide and potassium cyanide can be efficiently decomposed through a combined process of the two-stage denitrification unit and the advanced oxidation pond.

The application discloses a copper plating composition and a chemical copper plating process, and relates to the field of copper plating compositions, which is composed of the following components: a copper salt providing divalent copper ions; a complexing agent for complexing the divalent copper ions; a stabilizer for stabilizing the copper plating composition, which is selected from at least one of the group consisting of 2,2'-dipyridyl, potassium selenocyanate, potassium thiocyanate and 2-mercaptobenzimidazole; a reducing agent for reducing the complexed divalent copper ions to metallic copper; an alkaline adjusting agent for adjusting the pH value of the composition to an alkaline range suitable for chemical copper plating; and a solvent. The process stability and product yield are improved: through the optimized combination of the core stabilizer, the complexing agent and the reducing agent, the self-decomposition of the copper plating bath is effectively inhibited, the process stability is significantly enhanced, the incidence of key defects such as backlight defects in the metalization of the circuit board hole is greatly reduced, and the high yield of the final product is ensured.

The application discloses a kind of MIP / WS2-AC@Cu-MOF-199 modified glassy carbon electrode and its preparation method and electrochemical sensing detection perfluorooctane method, with MIP / WS2-AC@Cu-MOF-199 modified glassy carbon electrode as working electrode, Ag / AgCl electrode as reference electrode, platinum as auxiliary electrode, potassium ferricyanide / potassium ferrocyanide as charged probe molecule, and water PFOA is detected quickly using differential pulse voltammetry.The application will tungsten sulfide-activated carbon (WS2-AC) and Cu-MOF (199) are simply modified by ball milling, to strengthen the conductivity of original Cu-MOF material, to establish a simple and low-cost electrochemical sensing detection method.This method has simple detection, raw material source is extensive, and the method can effectively detect PFOA in a wide range and maintain good sensitivity.The application provides a kind of water perfluorooctane sensing detection method based on electrochemistry using MOF material, and has good application prospect.

This invention relates to the field of metal surface treatment technology, and discloses a low-cyanide, high-corrosion-resistant, and high-wear-resistant composite plating solution, its preparation method, and its application. It aims to solve the technical problem of balancing environmental friendliness and performance in existing cyanide zinc plating processes, which are limited by traditional strong alkaline systems. The composite plating solution, per liter, contains 15-30 g / L of a low-cyanide complexing agent (composed of sodium cyanide and potassium cyanide in a specific mass ratio), 40-80 g / L of a ternary cyanide-free auxiliary complexing agent, 20-50 g / L of zinc chloride main salt, 5-15 g / L of nano-wear-resistant reinforcing particles, 3-10 g / L of corrosion-resistant alloy components, 1-5 g / L of surfactant additives, and the balance being deionized water. The pH value of the plating solution is strictly controlled between 4.0 and 6.0. The preparation method includes four steps: preparation of the base solution, introduction of the main salt and corrosion-resistant alloy components, high-speed stirring and ultrasonic dispersion of nanoparticles, pH adjustment, and cooling filtration. Specific electroplating process conditions are used during application. This invention breaks through the traditional technical prejudice that cyanide electroplating must use a strong alkaline system, controlling the total cyanide concentration to within 30g / L, achieving a synergistic improvement in environmental protection and functionality. The coating can withstand neutral salt spray for 120-150 hours, Taber abrasion is reduced by more than 30% compared with traditional processes, the hardness reaches HV 500-600, and the plating solution has excellent stability. It can be widely used in the electroplating treatment of various metal products, and has outstanding advantages in safety, environmental protection and high performance.

This invention belongs to the field of functional coating technology, specifically relating to an electrolyte for electrodeposition preparation of FeCoNiCu high-entropy alloy coatings and its application. The electrolyte includes FeSO4·7H2O, CoSO4·7H2O, NiSO4·6H2O, CuSO4·5H2O, H3BO3, sodium citrate, citric acid, NaCl, and additives. The additives are selected from at least one of o-phenanthroline, o-chlorobenzaldehyde, potassium thiocyanate, sodium 3-mercapto-1-propanesulfonate, and 4-(2-pyridinium azo)resorcinol. This electrolyte can prepare FeCoNiCu high-entropy alloy coatings with similar atomic ratios of metal elements in a one-step electrodeposition process, achieving co-deposition of four elements. The addition of additives can improve cathodic polarization, refine grains, and prepare a dense coating exhibiting excellent wear resistance. Simultaneously, the process is simple, low-cost, environmentally friendly, non-toxic, and safe.

The invention relates to a process for synthesizing particles of a Prussian Blue analog of formula AxM1yM2z(CN)6 comprising at least the steps of: Having, on the one hand, an aqueous solution A comprising at least one water-soluble salt of a transition metal M1 and at least one water-soluble salt of a transition metal M2, and on the other hand, an aqueous solution B containing at least potassium or sodium cyanide; Injecting said solutions A and B simultaneously and separately into a reactor containing at least one aqueous medium; and Maintaining the mixture of solutions A and B thus formed in said reactor, under stirring and under conditions conducive to the formation of particles of said Prussian Blue analog by co-precipitation, said steps b and c being carried out under an inert atmosphere and at a controlled pH value, varying from 8 to 11. Figure for the abstract: None

The invention relates to the field of photocatalytic preparation of hydrogen peroxide, and particularly discloses a carbon nitride coated cadmium sulfide cubic material and a preparation method and application thereof.The preparation method comprises the steps that cadmium chloride, polyvinylpyrrolidone and sodium citrate are dissolved, a cobalt potassium cyanide solution is added for mixing, an ethanol water solution is added after centrifugal washing, and a Cd-PBA cubic solution is obtained; adding a sodium sulfide solution to react, centrifuging, washing and drying to obtain a product CdS cube; or dissolving thioacetamide in a Cd-PBA solution, adding ammonia water and a sodium sulfide solution for reaction, and performing separation, washing and drying to obtain a product CdS hollow cube; the preparation method comprises the following steps: adding carbon nitride and cadmium sulfide into organic alcohol, uniformly mixing, and carrying out rotary evaporation treatment and drying to obtain CdS-gCN; the CdS-gCN cube catalyst prepared by the method has the characteristics of stable structure, low cost, good dispersity and the like, the performance of the CdS-gCN cube catalyst is higher than that of a pure cadmium sulfide cube under different carbon nitride contents, and when the mass ratio of carbon nitride to cadmium sulfide is 4%, the catalytic performance of photocatalytic preparation of hydrogen peroxide reaches 6190 [mu] mol / g / h.

This invention belongs to the field of chemical synthesis technology and discloses a lactamide- 13 The preparation method of C includes the following steps: under nitrogen protection, acetaldehyde is added, and K is added. 13 CN, add 1 ml H2O, purge with nitrogen, add 30% sulfuric acid aqueous solution, react to complete, add sodium chloride solid until supersaturated, extract, and evaporate to dryness to obtain a yellow oily liquid; add 2-hydroxypropionitrile-1- 13 C. Add acetic acid, add hexamethylenetetramine, purge with nitrogen, allow the reaction to complete, add palladium nitrate, react for 30 minutes, concentrate, and column chromatography to obtain 2-hydroxypropionamide-1- 13 C. This invention avoids the use of reaction equipment with high airtightness requirements and low-temperature reaction conditions down to -78°C. It directly uses commercially available labeled potassium cyanide as the starting material, and the reaction conditions are mild and easy to implement. Moreover, the two-step reaction yield of this invention is higher than that of the prior art.

The invention discloses application of potassium-doped nitrogen oxidation phosphorescence catalysis on acidic uranium-containing wastewater, and belongs to the technical field of photocatalytic materials. According to the application, the K-PON photocatalyst is directly put into acidic uranium-containing wastewater with the pH value of 0.5-6 and is used for reducing and removing U (VI). The K-PON is prepared by mixing and grinding phosphorus oxynitride and potassium thiocyanate according to a mass ratio of 1: (0.5-4), and calcining at 400-600 DEG C for 1-5 hours. The core advantage of the invention is that the prepared K-PON photocatalyst not only can efficiently reduce U (VI) under the illumination condition, but also has the unique memory photocatalysis characteristic, can continuously release stored electrons in a dark environment, realizes the continuous reduction of U (VI), and has a good application prospect. The problems that a traditional photocatalysis technology depends on continuous illumination and is inactivated in a strongly acidic environment are solved, and a new material and a new method are provided for efficient and all-weather treatment of the acidic uranium-containing wastewater.

The application discloses a kind of NiCo@C HNs enzyme-like activity composite nanomaterial and preparation method thereof, the preparation method of the composite nanomaterial includes dispersing nickel nitrate and sodium citrate in water, adding potassium cyanide aqueous solution, incubation at room temperature, obtain NiCo precursor, NiCo precursor is dispersed into buffer solution, add dopamine, obtain the NiCo precursor with polydopamine coating, pyrolysis at 300 DEG C-500 DEG C, obtain product.The NiCo@C HNs enzyme-like activity composite nanomaterial of the application has the advantages of large specific surface area, regular and ordered pore size, high catalytic activity, its preparation process is simple, low in cost, suitable for large-scale preparation, and the composite nanomaterial can be used as functional nanomaterial for environmental monitoring and other fields, has wide application prospect.

This invention provides a reaction apparatus and a method for preparing 2,2-dinitropropanol. The preparation method includes the following steps: Nitroethane reacts with an alkaline solution in a series of sequential sub-static tubular reactors to obtain a dehydrogenation system; the dehydrogenation system reacts with an aqueous formaldehyde solution to obtain a hydroxymethylation intermediate system; the hydroxymethylation intermediate system reacts with a sodium nitrite solution to obtain a nitrosation intermediate system; the nitrosation intermediate system reacts with an aqueous sodium persulfate solution and an aqueous potassium ferricyanide solution to obtain a partially oxidized intermediate system; the partially oxidized intermediate system is then transferred to a dynamic tubular reactor for further oxidation to generate 2,2-dinitropropanol. This invention solves the problems of uncontrollable exothermic reactions, solid impurities causing pipeline blockage during oxidation, and high costs and environmental pollution due to excessive reliance on solvent dilution in existing 2,2-dinitropropanol preparation processes.