37 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 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 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 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 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 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.

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 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 application discloses a method for mass production of high-performance selenite lithium ion battery negative electrode material, and belongs to the field of preparation of lithium ion battery negative electrode material. The method solves the problems of long preparation period and low product content of the existing selenite material. The method comprises the following steps: grinding, mixing and uniformly distributing acetate tetrahydrate, selenium dioxide and graphene, placing the mixture in a ball mill tank, adding a dispersion liquid, ball milling to obtain a slurry, drying and collecting the powder to obtain the selenite lithium ion battery negative electrode material. The MSeO3@Graphene negative electrode has super-high specific capacity, and the specific capacity and long cycle performance are also very excellent under a super-high current density. The preparation process is simple, raw materials are easy to obtain, the period is short, the product content is high, and the method is suitable for mass production of selenite lithium ion battery negative electrode material, fills the blank of material limitation in laboratory preparation, and provides a feasible method for industrialization. The method is suitable for mass production of high-performance selenite lithium ion battery negative electrode material.

The invention belongs to the technical field of metallurgy, and discloses a method for comprehensively recycling acid-making electrospray slag. The method comprises the following steps: S1, slurrying: mixing and slurrying the electric mist slag, mercury-containing crude selenium and concentrated sulfuric acid to obtain a slurried material; s2, primary acidification roasting: feeding the pulpified material into a roasting furnace for roasting at the roasting temperature of 220-320 DEG C for 20-60 hours, and in the roasting process, the negative pressure in the furnace is 0-50 Pa; primary roasting slag is obtained; settling roasting flue gas to recover selenium dioxide; s3, secondary roasting is conducted, specifically, primary roasting slag is roasted again, the roasting temperature is 340-440 DEG C, the roasting time is 3-10 h, and the negative pressure in the furnace is-50--200 Pa in the roasting process; secondary roasting slag is obtained; and recovering mercury-containing crude selenium from roasting flue gas. By means of the method, effective separation and efficient recovery of selenium and mercury are achieved, and valuable metals such as selenium, mercury, lead, gold and silver are recovered in an echelon mode.

The invention aims to provide a method for preparing selenium nanoparticles by a low-temperature chemical method and application of the selenium nanoparticles in the field of functional materials. The selenium nanoparticle material disclosed by the invention has a stable hexagonal crystal mechanism; the raw material for preparing the selenium nanoparticles by the chemical solution method is selenium dioxide, and the used reducing agent is organic amine such as tetraethylenepentamine. The yield of the selenium nanoparticles prepared from tetraethylenepentamine at room temperature reaches 88%, and the selenium nanoparticles with the average grain size of 20 nanometers have excellent light absorption characteristics in the range of 230-670 nanometers. The chemical solution preparation method is rich in required raw materials, simple in process, low in cost and suitable for large-scale production of the high-purity selenium nanoparticles.

The invention provides a method for recovering germanium-selenium-arsenic and arsenic-selenium-chalcogenide glass cold working mixed chips, which utilizes the physicochemical properties of all components in the germanium-selenium-arsenic and arsenic-selenium-chalcogenide glass cold working mixed chips, introduces a segmented vacuum fractionation process, and enables water, oil and other low-boiling-point pollutants in raw materials to be recycled at different heating and condensing temperatures, so as to obtain the germanium-selenium-arsenic and arsenic-selenium-chalcogenide glass cold working mixed chips. The arsenic-selenium compound and the elementary substance enter a gas phase in sequence, and separation from the Ge-Se binary compound and the high-boiling-point impurities is achieved; the fractionation residue Ge-Se binary compound is subjected to oxidizing roasting, germanium concentrate and coarse selenium dioxide are obtained, the direct recovery rate of germanium reaches 96.5%, and the comprehensive direct recovery rate of selenium reaches 97.8%. The method effectively solves the problem of difficult recovery of germanium-selenium-arsenic and arsenic-selenium chalcogenide glass cold processing mixed chips, realizes green and efficient cyclic utilization of rare and precious metal elements in the material, is simple in process and environment-friendly, and provides support for benign development of the chalcogenide glass industry in China.

The application provides a method for preparing 6N selenium from 2N selenium, and belongs to the field of high-purity metal preparation.The method comprises the following steps: oxidizing and roasting 2N selenium to obtain selenium dioxide vapor; mixing the selenium dioxide vapor with water to perform a combination reaction to obtain a selenite solution; mixing the selenite solution with a reducing agent to perform a reduction reaction to obtain 3N and / or 4N selenium; melting the 3N and / or 4N selenium, and then immersing a crystallizer into the obtained melt to perform rotary crystallization to obtain 6N selenium.The application roasts selenium with oxygen to generate selenium dioxide to remove high-boiling impurities; the selenium is enriched by using the property that selenium dioxide is easily soluble in water, the impurities (such as selenium dioxide) that are difficult to dissolve in water are removed to realize the purification of selenium; the 3N and / or 4N selenium is further purified by rotary crystallization to realize the further purification of selenium.

This invention discloses a microcrystalline glass / porous fiber anode material and its preparation method, belonging to the field of battery anode materials. The microcrystalline glass is characterized by being a fluorine-oxygen metal oxide co-doped microcrystalline glass, wherein the fluorine-oxygen metal oxide is two or more of stannous fluoride, stannous oxide, germanium oxide, and selenium oxide. The fluorine-oxygen metal oxide co-doped microcrystalline glass anode material is a microcrystalline glass material with a stable perovskite structure within an amorphous network structure. It is obtained by high-temperature melting-cold extraction-melting-cold extraction followed by grinding into powder. The porous fiber is bamboo carbon fiber with mesopore size. The powder is embedded into the bamboo material using a negative pressure adsorption method and then carbonized to finally obtain the microcrystalline glass / porous fiber anode material. This method has a simple manufacturing process, excellent electrochemical performance, and can be used in the battery industry.

This disclosure proposes a lithium selenite / selenium dioxide bilayer-coated ternary material, wherein the chemical formula of the lithium selenite / selenium dioxide bilayer-coated ternary material is LiNi. a Co b Mn c O2·xLi2SeO3·ySeO2, where Li2SeO3 is the inner coating layer and SeO2 is the outer coating layer; where a+b+c=1, 0.6<a<1, 0<b+c<0.4, 0<x<0.3, 0<y<0.1, 0<x+y<0.4.

The utility model relates to a device for preparing selenium dioxide, which comprises a crude selenium filter press, a neutralizing washing tank, a neutralizing filter press, a drying melting furnace, a condenser, a crude selenium ingot casting device, a crusher, a forehearth generator, an oxidizing furnace, a product collecting box, a sedimentation collecting box and a buffer tank. The device disclosed by the utility model is high in selenium recycling rate, low in production cost and less in three wastes, can solve the problems of corrosion, short service life and lower selenium recycling rate of equipment for producing selenium dioxide from crude selenium, and achieves the purpose of clean production by recycling wastewater and waste residues.

This invention belongs to the field of metallurgical technology and discloses a method for the comprehensive recycling and utilization of electro-fogging slag from acid production. The method includes the following steps: S1. Slurrying: Electro-fogging slag, mercury-containing crude selenium, and concentrated sulfuric acid are mixed and slurried to obtain a slurry material; S2. Primary acid roasting: The slurry material is fed into a roasting furnace for roasting at a temperature of 220-320℃ for 20-60 h, with a negative pressure of 0--50 Pa inside the furnace during the roasting process; primary roasting slag is obtained; selenium dioxide is recovered through sedimentation of the roasting flue gas; S3. Secondary roasting: The primary roasting slag is roasted again at a temperature of 340-440℃ for 3-10 h, with a negative pressure of -50--200 Pa inside the furnace during the roasting process; secondary roasting slag is obtained; mercury-containing crude selenium is recovered from the roasting flue gas. This invention achieves effective separation and efficient recovery of selenium and mercury, and also recovers valuable metals such as selenium, mercury, lead, gold, and silver in stages.

The application 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, and then adding selenium dioxide and stirring uniformly; subsequently, a cobalt source, a nickel source and a reducing agent are added, and pH is adjusted to obtain a precursor solution; the precursor solution is subjected to hydrothermal reaction, and after centrifugation, washing, filtration and drying, a Si / Ni y Co (1‑y) Se x nanowire powder sample; after the powder sample is ground and sieved, chemical vapor deposition is performed to grow carbon nanotubes on the surface of the nanowires, and finally, the silicon-based composite material is obtained. In the silicon-based composite material, the surface of the nano-silicon particles is uniformly distributed with nickel-cobalt selenide nanowires and carbon nanotubes, the two are interwoven to form a cage-like conductive network structure, the nano-silicon particles are effectively coated and fixed, and therefore the overall electrochemical performance of the composite material is greatly improved.

The application discloses a kind of blackening agent for cast copper and its preparation process.The blackening agent for cast copper includes the following components by weight: 2-8 parts of selenium dioxide, 6-10 parts of copper sulfate, 5-10 parts of stabilizer, 0.5-1 part of complexing agent, 1-2 parts of wetting agent, 2-5 parts of preservative, 1-2 parts of oxidation promoter and 500-1500 parts of water.The application also provides a preparation process thereof.The process is relatively simple, short and low-energy consumption, and the most important advantage is that the brass castings treated by the process do not have the phenomenon of acid reflux, and the surface of the castings does not appear rust spots, corrosion and other phenomena, and the treated corrosion resistance and wear resistance are better.

The application relates to a preparation method of carbon-coated hollow siloxane material, which comprises the following steps: potassium hexacyanocobaltate, cobalt acetate tetrahydrate and trisodium citrate are added into deionized water, a first solution is obtained after complete dissolution, and the first solution is collected after solid is precipitated from the first solution to obtain a cobalt hexacyanocobaltate nano template; the nano template is added into a second solution, a layer of siloxane compound layer is prepared on the surface of the nano template to obtain an intermediate; the intermediate is dispersed into a third solution, the second solution is subjected to heat treatment at a predetermined temperature, a carbon-coated layer is prepared on the surface of the siloxane compound layer, the generated solid is collected, and the carbon-coated hollow siloxane material is obtained, wherein the second solution comprises tetraethyl orthosilicate, ethanol, ammonia and water, and the third solution comprises an amine compound, ethanol and selenium dioxide. The application solves the technical problem that the carbon-coated hollow siloxane negative electrode is difficult to prepare.

This invention discloses a method for preparing an infrared-transmitting material. By preparing a doped metal selenium sulfide and organically combining it with graphene, a material is obtained that is opaque in the visible light band (360-750nm) and translucent in the infrared band (750-1100nm), with a transmittance reaching 90%. The main steps include: (1) uniformly dispersing a stabilizer, zinc salt, copper salt, selenium oxide, and L-cysteine ​​in water sequentially; (2) adding a reducing agent solution dropwise under stirring to prepare a pre-product using a hydrothermal method; (3) sintering the pre-product at 900℃ to obtain a doped zinc-copper-selenium sulfide; (4) ultrasonically dispersing the pre-product with graphene oxide in ethanol, and adding vinyltriethoxysilane under acidic conditions to form an infrared-transmitting material. This composite material is simple to prepare, environmentally friendly, has high infrared transmittance, is stable and durable, and has excellent application prospects in information communication, infrared detection, and other fields.

The invention relates to the technical field of preparation of high-purity inorganic compounds, and discloses a rectification purification method for removing trace metal impurities in selenium dioxide, which comprises the following steps: dissolving crude selenium dioxide in an aqueous solvent to form a seleninic acid aqueous solution, adding a chemical reducing agent to regulate the valence state of the impurities, and adding a ferric nitrate auxiliary agent and a hydrolyzable alkaline precursor substance; heating to hydrolyze the precursor substance so as to generate alkali in situ, and realizing homogeneous co-precipitation of iron cations and impurities; the method comprises the following steps: separating precipitates, carrying out thermal dehydration on a purified seleninic acid aqueous solution obtained after separation, and carrying out thermal decomposition removal on residual nitrate anions by heating while crystallizing and separating out selenium dioxide. By selecting ferric nitrate and reusing the heating function of the thermal dehydration step, the problem of secondary pollution of anions caused by conventional ferric salt auxiliaries is avoided.

The invention discloses a method for preparing adipic acid through electro-catalytic oxidation of cyclohexanone. The method comprises the following steps: by taking a bimetallic selenium oxide catalyst as a catalyst, enabling cyclohexanone to react under an electrochemical condition, and then acidizing to prepare adipic acid. The bimetallic selenium oxide catalyst adopted by the invention is low in cost, excellent in electro-catalytic performance and long-term in durability; when used for preparing adipic acid through electro-catalytic oxidation of cyclohexanone, the composite material has the advantages of high Faraday efficiency and high yield, and has a wide application prospect in industrial application.