70 results about "Selenium Oxide" patented technology

The invention discloses a preparation method of a rare earth element doped nickel-based selenide nano-material and application of the rare earth element doped nickel-based selenide nano-material in electro-catalysis water full-hydrolysis reaction. According to the method, nickel salt, cerium salt, selenium dioxide and potassium chloride are prepared into electrolyte, and the electrolyte is subjected to electro-deposition on a foamed nickel substrate to obtain Ce-doped Ni0.85Se nanoparticles growing on foamed nickel. The crystal structure and electron distribution of Ni0.85Se are optimized by doping trace rare earth element cerium, so that the HER and OER performances of the Ni0.85Se are greatly improved. The prepared catalyst is self-supporting closely-packed nanoparticles, the formed amorphous structure is easy to expose more active sites, the catalyst has good electrocatalytic hydrogen evolution and oxygen evolution performance under alkaline conditions, the overpotential in electrocatalysis of nickel-based selenide is greatly reduced, and the electrocatalytic performance of nickel-based selenide is improved. And excellent electro-catalytic activity is shown in electro-catalytic water full hydrolysis. And the self-supporting electrode is not easy to fall off due to generation of bubbles in the reaction process, so that the working stability of the catalyst is improved.

The utility model relates to the technical field of selenium dioxide production, in particular to a selenium dioxide production device which comprises a reaction furnace, a feeding mechanism, a mounting shaft, a raking rod, a blanking net, a driving mechanism, an oxygen supply mechanism and an air outlet pipe, the feeding mechanism is arranged above the reaction furnace, and the discharging end of the feeding mechanism is communicated with the reaction furnace; the mounting shaft is arranged in the reaction furnace, and one end of the mounting shaft is rotationally connected with the inner wall of the reaction furnace; the multiple material raking rods are arranged, and each material raking rod is connected with the mounting shaft through two connecting rods. The driving mechanism works to drive the raking rod and the blanking net to rotate together, selenium powder accumulated at the bottom of the reaction furnace is raked, the raked selenium powder sequentially falls into the bottom of the reaction furnace through blocking and buffering of the blanking net, the selenium powder makes contact with oxygen in the falling process, the contact area between the selenium powder and the oxygen is greatly increased, and the contact time between the selenium powder and the oxygen is greatly prolonged. The reaction progress is accelerated and the production efficiency is improved.

The invention belongs to the technical field of nano composite materials, and relates to a preparation method of an iron diselenide / nitrogen-sulfur co-doped carbon nanosheet composite material, which comprises the following steps: putting cellulose, sodium bicarbonate and thiourea into a mortar, uniformly grinding, putting into a tubular furnace, calcining at high temperature under the protection of inert gas, naturally cooling, centrifugally separating and collecting the calcined powder, thereby obtaining the iron diselenide / nitrogen-sulfur co-doped carbon nanosheet composite material. The nitrogen and sulfur co-doped carbon nanosheets are obtained; ultrasonically dispersing iron nitrate nonahydrate in ethanol, heating in an oil bath until the ethanol is evaporated to dryness, and carrying out heat treatment to obtain an iron-based precursor; the obtained iron-based precursor, selenium dioxide and nitrogen and sulfur co-doped carbon nanosheets are ultrasonically dispersed in benzyl alcohol, the mixture is transferred into a reaction kettle with a polytetrafluoroethylene lining, the composite material is obtained after solvothermal reaction, and the morphology of the composite material is that iron diselenide nanoparticles are evenly and densely attached to the surfaces of the nitrogen and sulfur co-doped carbon nanosheets. The method is simple and easy to implement, suitable for large-scale production, easy to implement industrially and expected to be applied to the negative electrode of the hybrid supercapacitor.

The invention relates to the field of inorganic chemical industry production, and discloses a high-purity selenium dioxide continuous production process and equipment, the equipment comprises a cooling crystallization barrel, one side of the cooling crystallization barrel is provided with a selenium dioxide production mechanism, the selenium dioxide production mechanism is used for selenium dioxide production, and the cooling crystallization barrel is provided with a cooling crystallization barrel. An air pressure generation mechanism is arranged outside the cooling crystallization barrel, a gas on-off mechanism is arranged at the top of the air pressure generation mechanism, an air exhaust filtering mechanism is arranged at the top of the cooling crystallization barrel, and a tail barrel is arranged on the side, away from the selenium dioxide production mechanism, of the cooling crystallization barrel; the air pressure generating mechanism is used for keeping the negative pressure state in the cooling crystallization barrel and the tail barrel. According to the selenium dioxide production device, the inside of the feeding pipeline is filled with the materials, so that the materials can be supplemented in time after the materials are consumed, and selenium dioxide can be continuously and efficiently produced, so that the yield and the purity are improved, economic benefits are directly brought, energy waste is avoided, and economic loss is avoided.

The invention provides a method for producing a single-walled carbon nanotube by an electric arc method, and belongs to the technical field of preparation of carbon nanotubes. The method provided by the invention comprises the following steps: mixing a main catalyst, sulfur powder and selenium oxide powder, and calcining to obtain catalyst powder; mixing the catalyst powder with porous hard carbon to obtain a composite catalyst; a carbon source, the composite catalyst and reducing gas are subjected to a carbon atom recombination reaction in a reaction tube of a plasma electric arc furnace, and the single-walled carbon nanotube is obtained. According to the invention, the catalyst powder is firstly prepared and mixed with the porous hard carbon to form the composite catalyst, so that the catalyst can form a uniform catalyst core in a high-temperature area of a reaction tube, and the utilization rate of the catalyst and the quality of the single-walled carbon nanotube are improved; in addition, the porous hard carbon is easy to remove, impurities are not easy to introduce into the product, and the purity of the carbon nanotube is improved.

The invention relates to the technical field of preparation of electro-catalysis electrode materials, in particular to a preparation method and application of a SeO2 doped RuO2 electrolyzed water catalyst.The preparation method comprises the steps that S1, ruthenium acetate and selenium dioxide are dissolved in deionized water together and continuously stirred to obtain a mixed solution A, then sodium citrate is dissolved in deionized water, and the PH value is adjusted to be 9 with ammonia water to obtain a solution B; s2, mixing the solution A and the solution B, reacting at 80 DEG C for 12 hours, naturally cooling, ultrasonically washing with deionized water and ethanol in sequence, centrifuging, and drying in a drying oven to obtain a catalyst precursor; and S3, carrying out two-step pyrolysis on the precursor, namely heating to 250 DEG C, annealing for 4 hours, heating to 400 DEG C, annealing and heating for 2 hours, so as to obtain the SeO2-doped RuO2 nanosheet. By introducing a proper amount of SeO2 for doping, the electronic structure of RuO2 is optimized, the adsorption and desorption balance effect of the catalyst on a reaction intermediate is adjusted, the Ru site catalytic performance is improved, and the obtained SeO2-doped RuO2 nanosheet has efficient acidic OER catalytic performance.

The invention discloses a method for preparing 5N selenium powder, which specifically comprises the following steps: carrying out oxidation treatment on a crude selenium raw material to be treated to obtain selenium dioxide; dissolving the obtained selenium dioxide at normal temperature to obtain a seleninic acid solution; and carrying out cascade reduction reaction on the obtained seleninic acid solution under the action of an external magnetic field to obtain nano-scale selenium powder, and washing and drying the nano-scale selenium powder to obtain the 5N selenium powder. According to the method, the oxidation-reduction potential is controlled to rise in a stepped manner, and the external magnetic field is used for assistance, so that the oxidation-reduction reaction of selenium is adjusted, forward proceeding of the selenium reduction reaction is promoted, the whole preparation process is short, the selenium purity is high, and the direct yield of selenium is high.

The application discloses a controllable visual carbon monoxide releasing agent and a preparation method and application thereof, the releasing agent is Fla and Cys P molecules, Fla molecules are prepared by taking N,N-dimethyl-p-phenylenediamine as raw material, and the Fla molecules are prepared by cyclization, selenium dioxide oxidation, then hydroxy aldehyde condensation with 2-hydroxyacetophenone ketone under alkaline conditions, and esterification after acryloyl chloride; the structure of the Fla molecules is broken after light irradiation, and CO molecules are released; Cys P can react with cysteine (Cys) to generate flavone molecules Fla, and the releasing agent realizes visual detection of cysteine (Cys) and controllable release of CO.

This invention discloses a Se-doped Pt-based catalyst, its preparation method, and its application, relating to the field of catalyst technology. The preparation method of the Se-doped Pt-based catalyst includes the following steps: (1) mixing conductive carbon black and selenium dioxide powder uniformly to obtain a mixture; (2) heating the mixture to 250-350℃ under an inert atmosphere and holding for 0.5-2 h; (3) subsequently heating to 950-1100℃ and holding for 0.5-2 h to obtain powder A; (4) dissolving a platinum source in water to obtain solution B, then adding powder A to solution B and mixing uniformly, followed by rotary evaporation, grinding, and heating in a mixed atmosphere of H2 and Ar to obtain the Se-doped Pt-based catalyst. The Se-doped Pt-based catalyst prepared by the method of this invention exhibits high catalytic activity and stability in the hydrogenation reaction.

This invention relates to the field of electrocatalysis technology, specifically to a single-element selenium-nickel-iron alloy composite electrocatalyst, its preparation method, and its application. Using nickel chloride, ferrous sulfate, urea, ammonium fluoride, and selenium dioxide as precursors, a two-step hydrothermal method is employed. In the first step, a nickel-iron alloy is prepared in situ on a foamed iron substrate using nickel chloride, ferrous sulfate, urea, and ammonium fluoride precursors. In the second step, selenium dioxide is used as a selenium source to composite elemental selenium with the nickel-iron alloy, resulting in the in-situ growth of a single-element selenium-nickel-iron alloy block catalyst on a foamed iron substrate. The electrocatalyst of this invention exhibits excellent catalytic activity and stability in the electrocatalytic water desorption oxygen reaction, meeting the requirements for large-scale industrial applications.

The application provides a saturable absorption device, a preparation method and a low-threshold starting pulse mode-locked laser, and relates to the technical field of lasers. The application discloses a method for preparing a high-quality bismuth copper selenium oxide single crystal by a chemical vapor transport method, and a saturable absorption device prepared by simply using the high-quality bismuth copper selenium oxide single crystal can be applied to a pulse mode-locked laser, and can generate super-short pulse laser output, has high stability and a high signal-to-noise ratio, and has a low starting threshold.

The application belongs to the technical field of novel energy storage materials, and particularly relates to a high-performance electrochemical energy storage composite material and a preparation method and application thereof. The preparation method comprises the following steps: adding spherical copper powder into a chemical plating solution to prepare copper-coated nickel powder; mixing the copper-coated nickel powder, lanthanum selenium oxide powder and calcium chloride powder, and obtaining a composite foam metal substrate after cold pressing, sintering and boiling water immersion; adding onion carbon into a nitric acid solution for ultrasonic dispersion, then adding a silane coupling agent for microwave reaction, and obtaining modified onion carbon after filtration and drying; adding the modified onion carbon, cobalt nitrate and iron nitrate into water and uniformly mixing, adjusting the pH to 9-11, placing the composite foam metal substrate into the solution, and obtaining the electrochemical energy storage composite material after heating reaction and treatment. The electrochemical energy storage composite material prepared by the application has stable structure, excellent corrosion resistance and oxidation resistance, can be directly used as a working electrode of a supercapacitor, and can effectively improve the specific capacity and cycle stability of the supercapacitor.

The application discloses a kind of compositions of aldehyde removal release negative oxygen ion and preparation method thereof, it is related to decorative material technical field, raw material includes by weight parts: silicate 32-42 parts, titanium dioxide 10-12 parts, composite rare earth 6-8 parts, zirconium oxide 3-5 parts, diatomite 8-10 parts, tourmaline 14-16 parts, zinc oxide 4-6 parts, magnesium oxide 5-7 parts, selenium oxide: 2-3 parts, the silicate is high-activity porous silicate S100, S200 one or mixture of two, the titanium dioxide is nano sharp titanium type titanium dioxide P25, nano sharp titanium type titanium dioxide P90 one, the composite rare earth is lanthanum cerium composite rare earth oxide.High, formaldehyde purification effect is excellent, antibacterial performance is excellent and the like characteristics, can long-term effectively improve indoor microenvironment, air common harmful pollutants have good purification effect, while inhibiting harmful microorganism breeding, comprehensive promotion indoor air quality, provide more healthy, comfortable indoor environment for people.

The invention discloses an osthole derivative as well as a preparation method and application thereof, and relates to the technical field of pest control. The invention relates to a cnidium lactone derivative 3f, 3g of cnidium lactone derivative, and 3h of cnidium lactone derivative. According to the invention, a Schiff base reaction mechanism of coumarin in organic chemistry is taken as a theoretical basis, cnidium lactone is taken as a lead compound, 8-site methyl is oxidized into an aldehyde group (-CHO) through a selenium dioxide SeO2 and dimethyl sulfoxide DMSO system, functional groups containing halogen, thioether, sulfonic groups and the like in an imine structure are introduced, and a series of cnidium lactone derivatives are synthesized. And indoor acaricidal activity research is carried out on corresponding derivatives.

The invention belongs to the technical field of powder material preparation, and particularly relates to a method for preparing selenium powder by using a freezing airflow crushing method, and the method comprises the following steps: dissolving selenium oxide in water to form a solution, and adding a reducing agent to carry out a reduction reaction to obtain a mixed solution containing elemental selenium; the mixed solution containing the selenium simple substance is subjected to evaporation, crushing, freezing airflow crushing and grading treatment, and the selenium powder is obtained; the freezing airflow crushing temperature is-40 DEG C to 0 DEG C; the pressure of the freezing air flow crushing is 2 to 15 bar. The method provided by the invention can realize accurate regulation and control of the particle size of the selenium powder, and the prepared selenium powder is uniform in particle size, high in purity and suitable for large-scale production.

The invention discloses a cast copper blackening agent and a preparation process thereof. The cast copper blackening agent comprises the following components in parts by weight: 2-8 parts of selenium dioxide, 6-10 parts of copper sulfate, 5-10 parts of a stabilizer, 0.5-1 part of a complexing agent, 1-2 parts of a wetting agent, 2-5 parts of a preservative, 1-2 parts of an oxidation accelerant and 500-1500 parts of water. The invention also provides a preparation process of the composition. The process for blackening is relatively simple, short in flow and low in energy consumption, and has the most important advantages that the brass casting treated by the blackening process has no acid regurgitation phenomenon, rusty spots, corrosion and the like on the surface of the casting are avoided, and the treated brass casting is better in corrosion resistance and wear resistance.

The invention relates to a medical product for preventing or correcting selenium deficiency in a patient comprising a solution provided in a flexible container comprising at least one selenium compound in the form of Se(IV), which is preferably selected from the group consisting of sodium selenite, selenous acid and selenium dioxide, characterized in that the solution comprises dissolved oxygen (DO), preferably 0.5 ppm to 8 ppm DO.

The invention relates to the technical field of organic synthesis, in particular to a preparation method of a 1, 2, 4-triazine derivative. The 1, 2, 4-triazine derivative is prepared by taking a compound I and an amine compound (a compound II and / or an acid salt thereof) as initial raw materials, taking dimethyl sulfoxide as a solvent and an oxidizing agent and carrying out one-step efficient oxidation tandem cyclization reaction in the presence of a halogen simple substance. The preparation method provided by the invention has the advantages of simple steps, high yield, avoidance of use of highly corrosive hydrobromic acid and highly toxic selenium dioxide, mild reaction conditions and low production cost, and is suitable for large-scale production. Moreover, according to the preparation method provided by the invention, no unstable intermediate is generated, byproducts are few, and the high-purity 1, 2, 4-triazine derivative can be obtained through simple post-treatment steps.

The invention relates to a flexible container / multi-chamber container with selective dissolved gas content for stabilizing at least one compound of a medical product having a selective gas requirement for remaining stable, comprising a solution comprising the at least one compound and a fil material from which the container is made that provides for high gas-barrier for the said gas. The at least one compound may be selenium in the form of Se(IV) and is preferably selected from the group consisting of sodium selenite, selenous acid and selenium dioxide. The selective gas may be oxygen, and the headspace of the oxygen maintains the solution to comprise dissolved oxygen (DO) at a level of 0.5 ppm to 8 ppm.

The utility model relates to the technical field of selenium dioxide preparation, and discloses automatic selenium production equipment which comprises a reaction chamber used for generating gas containing selenium dioxide and a cooling unit connected with the reaction chamber, the cooling unit comprises a crystallizing tank and a scraping module arranged in the crystallizing tank, and an exhaust port and a discharge port are formed in the crystallizing tank; the gas exchanges heat in the crystallizing tank through the side wall of the crystallizing tank to be cooled and crystallized; and the scraping module is used for scraping off crystals generated on the side wall of the crystallizing tank and conveying the crystals to the discharge port. According to the utility model, crystallized products can be scraped off through the scraping module, so that the recovery rate of the products is improved, and the crystallized products can be prevented from being remained in the cooling unit to cause the reduction of the cooling crystallization efficiency.

The invention belongs to the technical field of nano material preparation, and particularly discloses a method for large-scale preparation of nano selenium based on a dry chemical method. The method comprises the following steps: mixing selenium dioxide and ascorbic acid in a dry state, and continuously stirring and reacting at normal temperature and normal pressure, so that selenium dioxide is reduced into red elemental selenium by ascorbic acid, nano-selenium particles with the particle size of 20-200 nanometers are generated, and a byproduct is organic acid. The obtained nano-selenium particles have good dispersibility, controllable particle size distribution and high purity, the reaction system is simple, water, a solvent or a surfactant is not needed, the product is easy to separate and purify, the process is green and environment-friendly, and the method is suitable for large-scale industrial production.

Provided is a method for preparing 7N tellurium, including the following steps: mixing 2N crude tellurium with concentrated sulfuric acid, and subjecting a resulting mixture to oxidation roasting to obtain a selenium dioxide vapor and a roasting residue; mixing the roasting residue with a strong base solution, and subjecting a resulting solution to electrolysis to obtain 4N electrolytic tellurium; subjecting the 4N electrolytic tellurium to vacuum distillation to obtain 5N tellurium; and melting the 5N tellurium to obtain a tellurium melt, immersing a crystallizer in the tellurium melt, and subjecting the tellurium melt to crystallization to obtain the 7N tellurium; wherein the method is performed for a total time of less than 14 days.

This invention relates to the field of agricultural planting technology, disclosing a nano-selenium-zinc nutrient agent and its preparation method, as well as a cultivation method for zinc-selenium-enriched tea. The preparation method of the nano-selenium-zinc nutrient agent includes the following steps: mixing a selenium source with a zinc source and an auxiliary agent to form a glass precursor material; melting the glass precursor material to form a glass melt; cooling the glass melt to form a solid selenium-enriched zinc glass body; mixing the solid selenium-enriched zinc glass body with deionized water and then wet-milling it under the action of an organosilicon surfactant and a chelating agent to obtain the final product; wherein the selenium source is selenium oxide, and the preparation method of the selenium oxide includes: mixing selenium powder and oxide evenly, followed by calcination under an oxidizing atmosphere to obtain the selenium source selenium oxide. Implementing this invention can solve the problems of low zinc and selenium absorption efficiency, elemental antagonism, and unstable quality in traditional zinc-selenium-enriched tea production, achieving precise control of the zinc and selenium content in tea, and improving tea yield and quality.

The invention discloses a cobalt selenium oxide-porous nitrogen-doped carbon composite material as well as a preparation method and application thereof. The cobalt selenium oxide-porous nitrogen-doped carbon composite material is mainly composed of a nitrogen-doped graphite carbon matrix and CoSeO3 nanoparticles loaded on the nitrogen-doped graphite carbon matrix. The preparation method comprises the following steps: preparing cobalt salt and dimethylimidazole into a mixed solution, continuously stirring to synthesize ZIF-67, mixing the ZIF-67 with selenium powder, grinding, pyrolyzing in a nitrogen atmosphere to obtain a pyrolysis product, cooling, and pickling to obtain the product. The cobalt selenium oxide-porous nitrogen-doped carbon composite material has the advantages of multiple catalytic sites, large pore volume, high graphitization degree, strong catalytic capability, good anti-interference capability and the like, has good cycle stability, can be recycled, is simple and feasible in preparation method and low in cost, can be used for treating antibiotic wastewater, and is high in removal efficiency and good in application prospect. And no high-toxicity product is generated, so that the method has a very good application prospect.

The invention belongs to the field of comprehensive utilization of resources, and discloses a method for extracting copper and selenium step by step through low-temperature sulfating roasting of copper anode slime. The method comprises the steps that the copper anode slime and sulfate are evenly mixed, and first-stage sulfating roasting is conducted at the temperature of 200-350 DEG C; the obtained roasted product is subjected to water leaching, and a copper sulfate solution and water leaching residues are obtained; and mixing the water leaching residues with sulfate, carrying out second-stage sulfating roasting at 450-550 DEG C, and collecting selenium-containing oxide. According to the method, first-stage low-temperature sulfating roasting is carried out, the copper anode slime reacts with sulfate to generate metal sulfur oxide, copper exists in the roasted product in the form of copper sulfate, separation of copper and other elements can be achieved through water leaching, the purpose of preferentially extracting copper is achieved, and the copper recovery rate can reach 94% or above; second-stage low-temperature sulfating roasting is carried out, water leaching residues react with sulfate to generate selenium oxide, selenium volatilizes in the form of gas, separation of selenium and other elements can be achieved through collection, and the volatilization rate of selenium can reach 97% or above.

The invention relates to a method for enhancing the mercury volatilization rate in the roasting process of mercury-containing acid mud, and belongs to the technical field of non-ferrous metal metallurgy and secondary resource recovery. The method comprises the following steps: slurrying the water-containing acid mud and concentrated sulfuric acid in proportion, and singly adding chloride, a carbonaceous reducing agent, metal sulfide and the like or an accelerant formed by compounding the materials into the slurried material; after uniform slurrying, segmented heating roasting is carried out, efficient decomposition and volatilization of mercury sulfate are realized in a relatively low temperature interval of 400-550 DEG C, and volatilized mercury vapor and selenium dioxide enter flue gas together and are respectively recovered by an absorption system. The accelerant with specific composition is added in the acid mud acidification roasting process, the decomposition temperature of mercury sulfate is effectively reduced, the volatilization rate of mercury in the roasting process is remarkably increased, and meanwhile inhibition on selenium volatilization recovery is reduced. The method is simple in process and safe to operate, can remarkably improve the recovery efficiency and economic benefits of mercury in the acid mud, and is suitable for resourceful treatment of the selenium-containing and mercury-containing acid mud generated in the process of making acid from the smelting flue gas.

The invention discloses a preparation method of 2-(alkyl / aryl R substituted) acyl-1, 10-phenanthroline, a condensation amine ligand and a condensation amine transition metal complex and a composite catalyst. 1, 10-phenanthroline and a lithium diisopropylamide reagent are subjected to ortho-lithiation reaction and then subjected to nucleophilic reaction with an alkyl / aryl carboxylic acid compound, and the compound shown in the formula (a) is obtained. The nontoxic lithium diisopropylamide reagent (LDA) is adopted to be subjected to non-nucleophilic ortho-lithiation reaction, and a traditional synthesis reaction containing highly toxic cyanide is replaced; an expensive nucleophilic reagent such as aluminum alkyl or lithium alkyl is replaced; the 2-(alkyl / aryl R substituted) acyl-1, 10-phenanthroline amine transition metal complex as shown in the formula (e), which is prepared and synthesized by replacing nitrobenzene and toxic selenium dioxide with a cheap and nontoxic carboxylic acid compound, has stronger ligand skeleton expansibility and higher compound stability, and is convenient for storage of a catalyst.

The invention provides a light-driven solid-state electrolyte membrane and an integrated flexible light-assisted solid-state sodium metal battery based on the light-driven solid-state electrolyte membrane, and belongs to the technical field of batteries, the battery comprises the light-driven solid-state electrolyte membrane and a photoelectrochemical storage positive electrode; the light-driven solid electrolyte membrane comprises polyoxyethylene, heterojunction filler, wood fiber soft filler and sodium salt, wherein the heterojunction filler is a composite material of copper oxide and indium oxide; the photoelectrochemical storage positive electrode comprises an indium selenium oxide film, titanium dioxide and sodium vanadium phosphate. According to the invention, trace heterojunctions are doped into polyethylene oxide electrolyte, and a photo-generated electric field generated by a photo-driving mechanism is utilized to reduce interface impedance, so that the ionic conductivity and sodium ion transfer number are effectively improved; a photoelectrochemical storage positive electrode with matched energy level is combined, so that a photon-generated carrier is utilized to the maximum extent, and the interfacial compatibility between the electrolyte and the positive electrode is enhanced; the battery assembled by the invention shows excellent cycling stability.

The invention belongs to the technical field of battery materials, and relates to a preparation method and application of a silicon-based composite material. The preparation method comprises the following steps: dissolving a PDDA solution in water and ethanol, adding nano silicon powder, then adding selenium dioxide, and uniformly stirring; then, a cobalt source, a nickel source and a reducing agent are added, pH is adjusted, and a precursor solution is obtained; carrying out hydrothermal reaction on the precursor solution, centrifuging, washing, filtering and drying to obtain a Si / NiyCo (1-y) Sex nanowire powder sample; and grinding and sieving the powder sample, then carrying out chemical vapor deposition, and growing a carbon nanotube on the surface of the nanowire to obtain the final silicon-based composite material. In the silicon-based composite material, the nickel-cobalt selenide nanowires and the carbon nanotubes are uniformly distributed on the surfaces of the nano silicon particles, the nickel-cobalt selenide nanowires and the carbon nanotubes are interwoven to form a cage-like conductive network structure, and the nano silicon particles are effectively coated and fixed, so that the overall electrochemical performance of the composite material is greatly improved.

The invention provides a device and a method for preparing high-purity selenium dioxide, which can effectively remove impurities which have large difference in saturation solubility with selenium dioxide solid phase in liquid phases such as water, ethanol and the like, and realize preparation of high-purity selenium dioxide. According to the invention, a dissolution crystallization method and a similar zone melting mechanism for melting crystallization are unified and expanded to most dissolvable compounds. The device and the method provided by the invention have the advantages of high purity upper limit, low energy consumption, strong applicability and the like.