36 results about "Selenous acid" patented technology

The invention provides a thioether oxidation catalyst, a preparation method thereof and a preparation method of pyroxasulfone. The preparation method comprises the following steps: S1, preparing a selenium source and a first solvent into a first solution; s2, adding a Lewis acid source into the first solution, and performing first mixing to obtain a second solution; s3, adding an organic alkali ligand source into the second solution, and performing second mixing to obtain a third solution; and S4, carrying out solvothermal reaction on the third solution at 100-150 DEG C to obtain the thioether oxidation catalyst. A selenium source, a Lewis acid source and an organic alkali ligand source are subjected to a combined reaction according to a specific sequence and conditions, and finally the inorganic-organic hybrid selenite catalyst with a special structure is formed under a solvothermal condition. The obtained catalyst is high in active atom utilization rate and strong in reactant molecule adsorbability, is beneficial to deep oxidation of reactants, accelerates oxidation of thioether into sulfone, and improves reaction selectivity and production efficiency.

The invention relates to a rapid biosynthesis method and antibacterial application of a photo-thermal nano material (Cu, Co) Se2. The method comprises the following steps: step 1, culturing dissimilatory metal reducing bacteria in a culture medium to a platform earlier stage, and activating; 2, the activated dissimilatory metal reducing bacteria are inoculated into an anaerobic culture medium, then bivalent copper salt and selenite are added, and Cu2-xSe nanoparticles are synthesized through a reaction under the anaerobic condition; wherein x is equal to 0-1; 3, divalent cobalt salt continues to be added under the anaerobic condition, thalli are separated into supernate through differential centrifugation, sediment is collected, and (Cu, Co) Se2 nanoparticles are obtained; step 4, carrying out cell disruption treatment on the (Cu, Co) Se2 nanoparticles; the light absorption range and intensity of the original selenide are improved, the photo-thermal efficiency of the selenide is enhanced, and the photo-thermal metal nano material (Cu, Co) Se2 can be efficiently, rapidly and controllably synthesized by the synthesis method.

The invention belongs to the field of environmental biotechnology and nano material application, and relates to a method for accelerating microorganisms to reduce selenite based on immobilized riboflavin. Aiming at the problems of poor stability, difficulty in recovery, non-repeated use and the like of dissolved riboflavin serving as an electron shuttle, riboflavin is grafted on the surface of a multi-walled carbon nanotube through a covalent binding method, and immobilized riboflavin capable of being recycled is constructed. The material can accelerate extracellular electron transfer of shewanella MR-1, and toxic sodium selenite is efficiently reduced into low-toxicity or non-toxic elemental selenium. Results show that the immobilized riboflavin not only maintains high reduction activity of riboflavin, but also has excellent cyclic utilization performance, still maintains high reduction rate after being repeated for multiple times, and effectively reduces operation cost and resource loss. According to the invention, an efficient, economical and sustainable application scene is provided for a microorganism-electron shuttle combined remediation technology, and a new thought is also provided for application of a functional nano material in an environmental biotechnology.

The application discloses a treatment method for efficiently removing selenium from waste acid, and specifically comprises the following steps: preheating waste acid to be treated for removing selenium, adding sulfuric acid to adjust the H + concentration of 4-6 mol / L, then adding a reducing agent sodium sulfite Na2SO3, and fully stirring and mixing; controlling the temperature to be 55-70 DEG C to perform a first-stage reaction, then adding a composite catalyst prepared by mixing sodium thiosulfate Na2S2O3 and iodine I2, stirring and mixing, continuing to perform a deep reaction, and performing solid-liquid separation after filtration when the reaction is completed. The application uses sodium sulfite reduction, iodine and sodium thiosulfate catalysis as a substitute for the traditional SO2 reduction mode, solves the problem that the traditional SO2 reduction method is limited by pH liquid, accelerates the reaction rate through iodine and sodium thiosulfate catalysis, simultaneously solves the problem that the traditional sulfite cannot reduce selenium-containing substances other than selenite, and improves the reduction effect of selenium.

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 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 invention discloses a preparation method of soluble selenium glycinate, which comprises the following steps: S1, reacting a selenium source with strong basic hydroxide in water to generate selenite; s2, reacting selenite with glycine and hydrogen peroxide in water for 12-16 hours to generate selenium glycinate; the reaction temperature is 5-15 DEG C, and the reaction needs to be carried out under a dark condition. The selenium glycinate product obtained by adopting the preparation method is stable in content and good in water solubility, the preparation process is simple, the cost is low, the operation is simple and convenient, additional chemical additives are not needed, and the operation steps are reduced; a by-product selenide salt in a chemical reaction can react with hydrogen peroxide to regenerate selenite, and the whole reaction process does not have redundant waste, so that the production concept of green chemistry is met; the product is good in solubility, wider in application field and better in application effect.

This invention discloses an electrochemical method for preparing staggered cuprous oxide micron-sized cubes, belonging to the field of electrode material preparation technology. The method utilizes a redox reaction at room temperature as the main synthesis mechanism, using clean copper foam as the copper source. The reaction is carried out in a mixed solution of alkaline solution and persulfate for a certain time. The copper foam intermediate is then sequentially cleaned, vacuum dried, and calcined. Subsequently, in a three-electrode system, the treated copper foam is used as the working electrode and electrochemically treated in a selenite solution to prepare a highly crystalline cuprous oxide material exhibiting a staggered micron-sized cube morphology with a smooth and flat cube surface. When applied to the energy storage field, it achieves a high areal specific capacity even at high current densities, with a maximum areal specific capacity of 1556 mF / cm². 2 This invention is simple to operate, has a short preparation cycle, is energy-saving, efficient, and inexpensive.

The invention belongs to the technical field of comprehensive utilization of resources, and particularly relates to a method for recovering valuable components in copper tellurium slag. The recovery method comprises the following steps that the copper tellurium slag is subjected to oxidizing roasting in oxygen, and a copper tellurium composite oxide and SeO2 flue gas are obtained; mixing the copper-tellurium composite oxide with biomass charcoal, and carrying out vacuum carbon thermal reduction reaction to obtain residues and tellurium-containing gas; the tellurium-containing gas comprises volatile tellurium, CO2 and SO2; condensing the SeO2 flue gas, mixing the obtained SeO2 solid with water, and carrying out electrodeposition on the obtained seleninic acid solution to obtain selenium; the residues comprise Cu, Au and Ag; elements in the copper tellurium slag comprise Cu, Te, Se, Au, Ag, O and S. According to the method, tellurium, copper and selenium can be recovered at high yield, and the recovered tellurium, copper and selenium are high in purity.

This invention discloses a selenite crystal and its preparation method. X-ray powder diffraction of the selenite crystal, measured using Cu-Kα radiation, yielded diffraction angles (expressed as 2θ) of 17.7°±0.2°, 19.5°±0.2°, 20.0°±0.2°, 22.9°±0.2°, 24.5°±0.2°, 24.9°±0.2°, 26.2°±0.2°, 29.8°±0.2°, 30.2°±0.2°, 31.4°±0.2°, and 33°. Characteristic peaks are observed at 0°±0.2°, 34.3°±0.2°, 35.8°±0.2°, 36.6°±0.2°, 37.4°±0.2°, 37.5°±0.2°, and 38.4°±0.2°. A characteristic endothermic peak is observed at 73.4℃ in the differential scanning calorimetry (DSC) spectrum of the crystal. This invention features a simple preparation route, mild reaction conditions, convenient operation, low cost, and good process reproducibility. The prepared selenite has a stable crystal form, making it suitable for large-scale industrial production of pharmaceutical raw materials.

The present invention provides a thioether oxidation catalyst, a preparation method thereof and a preparation method of sulfonepyraclostrobin. The preparation method includes: step S1, a selenium source and a first solvent are formulated into a first solution; step S2, a Lewis acid source is added to the first solution, and after the first mixing, a second solution is obtained; step S3, an organic base ligand source is added to the second solution, and after the second mixing, a third solution is obtained; step S4, the third solution is subjected to a solvent thermal reaction at 100 DEG C to 150 DEG C to obtain a thioether oxidation catalyst. The present invention combines a selenium source, a Lewis acid source and an organic base ligand source in a specific order and condition, and ultimately forms a structurally special, inorganic-organic hybridized selenite catalyst under solvent thermal conditions. The active atom utilization rate of the obtained catalyst is high, and the adsorption property to the reactant molecules is strong, which is conducive to the deep oxidation of the reactant, accelerates the oxidation of thioether to sulfone, and improves the selectivity and production efficiency of the reaction.

The invention discloses a method for recovering Se and TeO2 from tellurium-containing crude selenium refining slag, which comprises the following steps of: crushing the tellurium-containing crude selenium refining slag, performing temperature-controlled roasting, decomposing nitrate, and oxidizing tellurium into a high valence state; the roasting slag and a reducing agent are mixed and heated under the vacuum condition, so that the selenium compound is reduced into elemental Se and volatilized, and meanwhile high-valence tellurium is reduced into tetravalent tellurium salt residues; crushing the reduced product, performing water-soluble leaching, and filtering to obtain a solution containing selenite and tellurite and TeO2 precipitate; adding acid into the leaching filtrate to hydrolyze the tellurite salt into TeO2 precipitate, and filtering and separating to obtain TeO2 and selenium-containing filtrate; finally, acid and a reducing agent are added into the selenium-containing filtrate, and selenite is reduced into elemental Se precipitate. The method realizes efficient separation and recovery of selenium and tellurium, is reasonable in process flow and high in recovery rate, and has a good application prospect.

A laser sintering deposition method is provided for disposing lead selenide onto a substrate. The method includes: wet-milling a lead selenide ingot mixed with methanol into a colloidal slurry containing nanocrystals; separating the colloidal slurry into nanocrystal particles and the methanol; depositing the nanocrystal particles to a substrate; and emitting coherent infrared light onto the nanocrystal particles for fusing into a lead selenide crystalline film. Afterwards, the lead selenide film can be exposed to oxygen to form a lead selenite layer, and subsequently to iodine gas to produce a lead iodide layer onto the lead selenite layer.

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.

The invention provides a selenium form standard quality control sample in a nut matrix as well as a preparation method and application thereof, and belongs to the technical field of standard substances. The method comprises the following steps: performing primary crushing on seed kernels of Brazil nuts to obtain seed kernel particles; sequentially performing degreasing treatment and secondary crushing on the seed kernel particles to obtain degreased powder; spraying a selenite solution on the degreased powder to obtain composite powder; the composite powder is sequentially subjected to freeze drying, third crushing and mixing, and the selenium form standard quality control sample in the nut matrix is obtained. The standard quality control sample for the selenium form in the nut matrix, prepared by the method disclosed by the invention, has good uniformity and stability, and by adopting the standard quality control sample, the accuracy and the reliability of a content detection result of the selenium form (selenite and / or selenomethionine) in plant products such as nuts can be improved.

The application provides a genipin cross-linked selenium nanoparticle and a preparation method and application thereof, and belongs to the field of functional nanomaterials and intelligent nutrition delivery technology. The preparation method comprises the following steps: dissolving a protein substance in water to obtain a protein solution, adding a selenous acid compound, then adding vitamin C and genipin, performing cross-linking reaction, and performing dialysis on the obtained reaction solution to obtain the genipin cross-linked selenium nanoparticle. The application innovatively uses the concentration of genipin as a control switch, realizes active and accurate control of the release rate of selenium in the intestinal tract, realizes the treatment effect on colitis through instantaneous high-concentration release under a low-concentration selenium administration dose, and effectively solves the defect that the "nutrition-toxicity" dose range of selenium is narrow.

The present invention relates to methods for biological wastewater treatment for Se control in Se-laden wastewater. The Se contaminants in the wastewater include the Se oxyanions selenate (SeO42−) and selenite (HSeO3−), which are biochemically reduced and transformed to elemental selenium (Se0) by microorganisms through anaerobic biological reduction. The resulting Se0 is entrained in the biomass, which is further processed to enable the efficient recovery of concentrated Se0.

The invention provides a leaf surface resistance and control agent for reducing mercury content of crops and a preparation method and application of the leaf surface resistance and control agent. The leaf surface resistance and control agent comprises Tween, a component a and a component b, wherein the component a comprises one or more of tartaric acid, tartrate, humic acid and humate, and the component b comprises one or more of selenite and metal sulfide. The content of mercury in crops can be effectively reduced by applying the foliar resistance and control agent to the crops in a foliar spraying manner.

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 application discloses a selenium catalytic synthesis method of polylactic acid in the technical field of material chemistry. L The amount of the substituted selenous acid as the catalyst precursor added into the lactic acid is 0.02-0.08% of the mass of the lactic acid. L The amount of the substituted selenous acid as the catalyst precursor added into the lactic acid is 0.02-0.08% of the mass of the lactic acid. L The amount of the substituted selenous acid as the catalyst precursor added into the lactic acid is 0.02-0.08% of the mass of the lactic acid. 3 The polylactic acid can be obtained by blowing the material into a flow of 0.4-1.0 cm / s air and heating at 160-180 DEG C. The method is simple, and the use of metal catalysts can be avoided, so that metal residues in the product are eliminated, and medical-grade polylactic acid material can be directly prepared.

The cultivation method for increasing the selenium content of the black fungus comprises a cultivation material for increasing the selenium content of the black fungus, and the cultivation material is formed by mixing a slow-release sodium chlorate composite material and a slow-release selenium-containing mineral substance material with carbon nutrition, nitrogen nutrition and mineral nutrition. Sodium chlorate and selenium are respectively prepared into specific slow release systems, and are slowly released in the cultivation material to react to generate a seleninic acid component which can be easily absorbed and utilized by the black fungus, so that the concentration of seleninic acid in the cultivation material is regulated, the growth of the black fungus is promoted, the yield of the black fungus is increased, the quality of the black fungus is remarkably improved, and the cultivation cost is reduced. The selenium content and the amino acid content in the black fungus are remarkably increased, the cultivation material can be used for seedling cultivation of black fungus strains with high selenium content, and high-quality black fungus strains with high selenium content are obtained through cultivation of the cultivation material.

The invention belongs to the field of recycling of refined copper byproducts, and particularly relates to a selenium recovery method based on copper anode slime, which comprises the following steps: oxidizing selenium element in barrel anode slime into SeO2 through concentrated sulfuric acid, steaming the SeO2 into a spray tower, contacting the SeO2 with spray water, converting the SeO2 into seleninic acid, reducing the selenium into elemental selenium by SO2 which is steamed, and settling the elemental selenium; meanwhile, the graphene is mixed and dispersed in reactants, and based on the structural stability of the graphene under high-temperature roasting, the promotion effect on electron transmission is reserved at the high temperature, so that the electron transfer efficiency of the redox reaction between the concentrated sulfuric acid and the anode slime can be improved, and the recovery rate of the anode slime is improved. Therefore, the conversion evaporation recovery efficiency of selenium in the anode slime is improved.

The invention provides a preparation method of a seleninic acid soap-based microemulsion capable of being infinitely diluted by water, which comprises the following steps of: efficiently emulsifying various liquid oil by taking organic sodium selenite soap as a main emulsifier, fatty alcohol as a co-emulsifier and a composition of the organic sodium selenite soap and the fatty alcohol as an emulsifier to obtain the seleninic acid soap-based microemulsion by a simple preparation method; the obtained seleninic acid soap-based microemulsion can be infinitely diluted by water, and the obtained seleninic acid soap-based microemulsion is low in emulsifier content, good in solubilizing performance and high in stability. The invention further provides a imperative demulsification method of the seleninic acid soap-based microemulsion capable of being infinitely diluted by water, imperative demulsification of the seleninic acid soap-based microemulsion can be realized by changing the pH value of the seleninic acid soap-based microemulsion, a one-solid two-liquid three-phase system is obtained, high-efficiency recovery of organic seleninic acid is realized, and meanwhile, the pH value of the seleninic acid soap-based microemulsion is changed. And the chemical oxygen demand of the residual water phase treated by the activated carbon and the anion exchange resin is extremely low.

The invention discloses a simple preparation and separation method of high-valence selenium and low-valence selenium in the technical field of feeds and fertilizers, which comprises the following steps: by taking elemental selenium and sodium hydroxide or potassium hydroxide as raw materials, generating a mixed solution of sodium selenide and sodium selenite in one step through disproportionation reaction, and then connecting-2-valence selenium to starch molecules through nucleophilic addition reaction to obtain the high-valence selenium and low-valence selenium. The method comprises the following steps: by taking selenium as a raw material, generating a high-stability selenized starch material, and carrying out solid-liquid separation to respectively obtain the selenized starch material and a selenite-containing mother solution, thereby realizing the separation of high-valence selenium and low-valence selenium. The selenized starch material can be used for producing selenium-rich feed, and tetravalent selenium in the solution can be used for producing selenium-rich compound fertilizer. The method has the advantages of short process flow, simple operation, no need of introduction of complex reagents or expensive equipment and low cost, and avoids the regeneration of selenium elementary substance by the neutralization reaction through the separation technology. The method provides a new technical path for realizing high-valued utilization of selenium.

The present invention discloses a nonlinear optical crystal bismuth iodide selenite, a preparation method thereof and an application thereof. The nonlinear optical crystal bismuth iodide selenite has a chemical formula of BiSeIO6, is an orthorhombic crystal system, has a space group of Pna2(1), and has unit cell parameters of a=7.115 Å, b=11.335 Å, c=6.717 Å, and V=541.67 Å. 3 A bismuth source, an iodine source, and a selenium source are mixed in a molar ratio of bismuth to iodine to selenium of 1-1.2:1-1.2:1-1.2, and subjected to a hydrothermal reaction at 150-250°C for at least 24 hours to obtain a nonlinear optical crystal, bismuth iodide selenite. The nonlinear optical crystal bismuth iodide selenite of this invention is used in laser frequency conversion devices. It exhibits a strong frequency-doubled effect. Under 1064nm pulsed laser pumping, the powder frequency-doubled intensity generated is six times that of potassium dihydrogen phosphate (KDP) under the same conditions. It also achieves type I phase matching, facilitating the debugging of laser devices and efficient laser frequency conversion applications.

The invention discloses a slow-release selenium-rich nitrogen fertilizer and a preparation method thereof in the technical field of functional fertilizer production, and the slow-release selenium-rich nitrogen fertilizer comprises the following raw materials in parts by weight: 7.5-10 parts of urea, 7-9 parts of formaldehyde, 0.01-0.5 part of chitosan, 0.1-0.8 part of phosphoric acid, 0.01-0.1 part of sodium selenite, 0.01-0.1 part of seleninic acid and 0.03-0.3 part of ascorbic acid. The technical design is novel, the preparation method is simple, the preparation reaction process is carried out at normal temperature and normal pressure, and all the used raw materials are converted into products; the nitrogen element and the selenium element in the slow-release selenium-rich nitrogen fertilizer both show a good slow-release effect, so that the slow-release selenium-rich nitrogen fertilizer can promote crop growth, increase the content of selenium in agricultural products and improve the quality of the agricultural products.

The application provides a selenium form standard quality control sample in a nut matrix and a preparation method and application thereof, and belongs to the technical field of standard substances. The kernel of abalone fruit is first crushed to obtain kernel particles; the kernel particles are sequentially subjected to defatting treatment and second crushing to obtain defatted powder; a selenite solution is sprayed on the defatted powder to obtain composite powder; and the composite powder is sequentially subjected to freeze-drying, third crushing and mixing to obtain the selenium form standard quality control sample in the nut matrix. The selenium form standard quality control sample in the nut matrix prepared by the method has good uniformity and stability, and the use of the standard quality control sample helps to improve the accuracy and reliability of the detection results of the selenium form (selenite and / or selenomethionine) content in plant products such as nuts.

As the human body cannot prepare selenium, almost all selenium in the human body comes from diet. The main food for providing selenium in the diet is bread, grains, meat, fish, eggs, dairy products and the like. However, the selenium element which can be absorbed and utilized by the human body in the diet is limited. Therefore, the seleninic acid plays an important role in providing trace elements necessary for the human body as a medicine supplement. The invention discloses a preparation method of seleninic acid, and belongs to the technical field of medicines, and the seleninic acid is used as a medicine supplement. The seleninic acid conforming to the United States Pharmacopoeia standard is obtained through crude product preparation, decoloration and refining. The method has the beneficial effects that the method has the advantages of simple preparation route, mild reaction conditions, convenience in operation, low cost, small environmental pollution and high yield, and is suitable for industrial large-scale production.

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 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.