127 results about "Seleninic acid" patented technology

The invention discloses a method capable of improving selenium content for preparing polysaccharide selenite. The method comprises the steps of adding a selenium compound solution having the mass fraction of 60-80% by spraying to a polysaccharide or a polysaccharide complex under a stirring condition and reacting at a temperature in the range of 120-160 DEG C; after the reaction is completed, purifying and drying the reaction product to obtain polysaccharide selenite, wherein the selenium compound is seleninic acid or a selenite. The method is simple in process, easy in after-treatment, controllable in reaction conditions and good in repeatability; in the production process, the generation of toxic gases such as hydrogen selenide is avoided and the use of a strong acid and heavy metals such as a barium salt to catalyze the reaction and the use of toxic organic solvents such as pyridine and benzene are avoided, and therefore, the production process is green and environment-friendly; the polysaccharide selenite prepared by the method is low in toxicity and high in bioavailability, and the selenium content of the polysaccharide selenite is higher than 18% which is far higher than the selenium content of less than 2% of the present commercial organic selenium products.

A process for synthesizing a micro-class hollow zinc selenide sphere features that hydrothermal reduction reaction between zincic acid radical ions and seleninic acid or soluble selerate under action of hydrazine hydrate as reducer in strong alkaline condition at 100-200 deg.C in a sealed reaction. It is possible to dope it or coat it. Its advantages are low cost and high quality.

A colloidal Se nanoparticle is prepared from seleninic acid and ascorbic acid at ordinary temp. It can be used as the marker in immunochromatography with high sensitivity and speed. Its advantages are short preparing period and high output.

The invention discloses a method for recovery of selenium from copper anode mud. The method consists of: pre-sulfating copper anode mud containing impurities, then performing roasting to generate gaseous selenium dioxide and sulfur dioxide, sending the mixed gas of selenium dioxide and sulfur dioxide into a lead absorption tower through a pipeline so as to obtain a part of elemental selenium and a part of seleninic acid, recovering absorption liquid with residual seleninic acid into a vacuum circulation jet pump barrel filled with excessive sulfur dioxide, and performing reduction to obtain elemental selenium. The method increases the recovery rate of selenium in copper anode mud from 90%-95% of the conventional process to 99.5% or more, lowers the selenium recovery cost, alleviates the environmental protection pressure, and reduces emission of sulfur dioxide.

The invention discloses selenium-doped hydroxyapatite and a preparation method thereof. The selenium-doped hydroxyapatite which is obtained by the preparation method has an apatite structure; and a selenium element partially replaces the positions of phosphate radical and/or hydroxyl in the hydroxyapatite crystal in the form of seleninic acid radical. The yield of selenium-doped hydroxyapatite ishigh and the selenium-doped hydroxyapatite has high dispersibility.

A nano-class TiO2/SeO2 composition used for solar cell is a spherical nano-particle and has the anatase-phase crystal structure. Its preparing process includes such steps as reaction between titanate or TiCl4 or titanium sulfate or titanium oxide sulfate and SeO2 or seleninic acid, and water-bath ageing or hydrothermal synthesis or high-temp burning.

The invention provides a method for synthesizing 1,2-cyclohexanediol by cyclohexene under selenium catalysis. The method comprises the following steps of: taking cyclohexene as a raw material, taking a selenium compound as a catalyst, and taking hydrogen peroxide as an oxidant; carrying out reaction at a temperature of 15-80 DEG C in the presence of a solvent, wherein a mole ratio of the hydrogen peroxide to the cyclohexene is (0.5-1.5): 1, the mole fraction of the selenium compound and the cyclohexene is 0.1-1 percent, and the concentration of the reaction solution based on a solvent calculation is 1-20 mol/L. Furthermore, the production can be continuously carried out by adding the raw materials for the next turn into reaction residues. After the reaction, the solvent and non-reacted raw materials are respectively recycled by distillation and a product is refined. The selenium compound is selected from diselenide, selenious acid, and phenyl, fluoro-phenyl, tolyl substitutes and the like of the diselenide amd the selenious acid. The solvent is selected from acetonitrile, water, ethanol and acetic acid. The method disclosed by the invention has the advantages of simple process flow, temper reaction conditions, and high yield (the highest yield can be up to 92 percent). The method is efficient, clean and environment-friendly and further has the characteristics of simple components in a reaction system, easiness of product purification, and easiness of recycling the solvent and the catalyst.

The invention discloses a blackening agent at room temperature and a preparation method for the blackening liquid at the room temperature, which are widely applied to the blackening processing for finished products or parts of various alloy steels, cast irons and the like. The blackening agent at the room temperature is prepared from the following components: 2-4g/L of copper sulfate, 5-8g/L of seleninic acid, 2-4g/L of monopotassium phosphate, 1.5-3g/L of hydroquinone, 3-5g/L of phosphoric acid and 0.08-0.3g/L of OP-10. The preparation method comprises the following steps: respectively dissolving the components except the phosphoric acid and the OP-10 with deionized water through heating and then mixing the components evenly, and finally adding the phosphoric acid and the OP-10 for evenly mixing. The blackening agent has the advantages of quick blackening, good film quality and low production cost.

The invention discloses a CTS-ZnO fluorescent test paper comprising a test paper matrix material impregnated and loaded with silanization nano zinc oxide, wherein the load capacity of the silanization nano zinc oxide is 0.010 mg/mm<2>, and also provides a preparation method and application of the test paper. A silanization nano zinc oxide material with fluorescence characteristics and high water stability is prepared and solidified on the surface of the test paper matrix material to prepare the CTS-ZnO fluorescent test paper; and a portable fluorescence intensity measurement instrument is employed to determine the concentration of seleninic acid ions. The employed fluorescent test paper strip is cheap, portable and shows the integrated design characteristics; the quantitative method is intuitive and fast, and fluorescence intensity changes can be observed through the visual discoloration; and the concentration of seleninic acid ions in the solution to be tested can be determined directly. The method has the advantages of simple operation, short detection time and high sensitivity, and adapts to rapid, sensitive and trace rapid test of seleninic acid ion content in all kinds of water and on-site application.

The invention relates to isoalantolactone derivatives and salts thereof and provides an isoalantolactone derivative as shown in a formula (I). Salification acids are selected from inorganic acids or organic acids; the inorganic acids are selected from hydrofluoric acid, hydrochloric acid, hydrobromic acid, hydroiodic acid, sulfuric acid, nitric acid, phosphoric acid, carbonic acid, boric acid, seleninic acid, phosphomolybdic acid, phosphorous acid and sulphurous acid; the organic acids are selected from citric acid, maleic acid, D-malic acid, L-malic acid, DL-malic acid, L-lactic acid, D-lactic acid, DL-acid, oxalic acid, methylsulfonic acid, pentanoic acid, oleic acid, lauric acid, p-toluene sulfonic acid, 1-naphthalenesulfonic acid, 2-naphthalenesulfonic acid, phthalic acid, tartaric acid, malonic acid, succinic acid, fumaric acid, glycolic acid, mercaptan acid, glycine, sarcosine, sulfonic acid, nicotinic acid, methylpyridine acid, isonicotinic acid, benzoic acid or substituted benzoic acid.

The invention relates to a binder-free selenium cathode material with self-supporting structure and a preparation method thereof. The preparation method comprises the following steps: Step 1) dissolving selenium dioxide in deionized water to obtain a uniform seleninic acid solution, and dissolving a reducing agent in the seleninic acid solution to obtain an uniformly-mixed solution, wherein molar concentration of selenium dioxide is 0.01-1 mol/liter, and molar concentration of the reducing agent is 0.01-0.5 mol/liter; Step 2) putting the solution obtained in the Step 1) and a conductive network structured substrate in a reaction vessel and heating at the temperature of 50-250 DEG C for 1-96 h; and Step 3) washing the sediment-attached conductive network structured substrate with anhydrous ethanol and deionized water at least once, and drying at the temperature of 40-100 DEG C so as to obtain the binder-free selenium cathode material with a self-supporting structure. The invention has characteristics as follows: the process is simple; cost is low; and the morphology is controllable. The preparation method of the invention is a preparation method suitable for large-scale production.

The invention relates to an application of an isoalantolactone derivative and a salt thereof in the preparation of medicines for treating lung fibration, and provides an isoalantolactone derivative represented by formula (I). An acid for forming the salt is an inorganic acid or an organic acid, the inorganic acid is selected from hydrofluoric acid, hydrochloric acid, hydrobromic acid, hydroiodic acid, sulfuric acid, nitric acid, phosphoric acid, carbonic acid, boric acid, seleninic acid, phosphomolybdic acid, phosphorous acid and sulfurous acid, and the organic acid is selected from citric acid, maleic acid, D-malic acid, L-malic acid, DL-malic acid, L-lactic acid, D-lactic acid, DL-lactic acid, oxalic acid, methanesulfonic acid, pentanoic acid, oleic acid, lauric acid, p-methyl benzenesulfonic acid, 1-naphthalenesulfonic acid, 2-naphthalenesulfonic acid, phthalic acid, tartaric acid, propane diacid, succinic acid, fumaric acid, glycollic acid, thioglycollic acid, glycine, sarcosine, sulfonic acid, nicotinic acid, methylpyridine acid, isonicotinic acid, benzoic acid and substituted benzoic acid.

The invention discloses a method for the Radix Platycodonis polysaccharide regulated preparation of a nutritional liquid fertilizer containing nano-selenium. The method comprises the following steps: preparing a nano-selenium solution from Radix Platycodonis polysaccharides and seleninic acid by using an ascorbic acid reduction technology; preparing a soybean meal composite amino acid stock solution from soybean meal by using a sulfuric acid hydrolysis technology, adsorbing and decolorizing the stock solution by active carbon modified through 0.25% KOH solution treatment, filtering the stock solution, sterilizing the obtained filtrate by cobalt60 to prepare a soybean meal composite amino acid solution; and uniformly mixing magnesium sulfate, zinc sulfate, manganese sulfate, ferrous sulfate, borax, copper sulfate, sodium molybdate, silica, Arabic gum and water with the nano-selenium solution and the soybean meal composite amino acid solution to prepare the nutritional liquid fertilizer containing nano-selenium. The soybean seed composite amino acid solution and trace elements are compounded to make the trace elements exist in a chelated state, so the utilization rate of the trace elements is increased, the absorption of the plants to macro-elements is promoted, the crop yield is increased, and the crop quality is improved.

The invention belongs to the technical field of metallurgy, and particularly relates to a method for separating tellurium in the high tellurium containing complex crude selenium refining process. A certain amount of sodium carbonate is added to crude selenium, selenium and tellurium both can react with sodium carbonate to generate corresponding salt in the oxidation process, selenium salt is heated to be fast decomposed and volatilized at certain temperature, and generates corresponding selenium dioxide with oxygen, selenium dioxide is absorbed by water to generate a seleninic acid solution, and tellurium salt is not likely to volatilize and is mostly enriched in oxidizing slag. The oxidizing temperature of one segment of an oxidizing furnace is increased, tellurium and selenium are fully separated, the acidity of the seleninic acid solution is improved through sulfuric acid before reduction, the reduction rate of SO2 on tellurium is lowered, tellurium in the seleninic acid solution is left in the solution as much as possible, and therefore selenium and tellurium are further separated, and the quality of fine selenium powder is ensured. According to the method, the process of an oxygen oxidation method is optimized, the production period is shortened, the quantity of reagents is reduced, production cost is reduced, the direct recovery rate of selenium is improved to 94% from original 92.6%, and good popularization value and economic benefits are achieved.

The invention provides a method for treating selenium-containing sewage, which comprises the following steps: regulating the pH value of the selenium-containing sewage to 7-8 to serve as the raw sewage, wherein selenium in the raw sewage exists in the form of seleninic acid ion or selenate radical icon; supplying the raw sewage to a first adsorption column, wherein the first adsorption column contains C100 resin, performs a first adsorption treatment on the raw sewage and discharges the first treated sewage; supplying the first treated sewage discharged from the first adsorption column to a second adsorption column, wherein the second adsorption column contains C108 resin or A420 resin, performs a second adsorption treatment on the first treated sewage and discharges the second treated sewage. The method for treating selenium-containing sewage can effectively treat selenium-containing sewage, including micro-content selenium sewage, low-content selenium sewage and high-content selenium sewage, and can remove quadrivalent selenium or hexavalent selenium in the sewage, so as to separate two valency states of selenium.

The invention discloses a method for extracting selenium from nickel-molybdenum ore smelting smoke dust in an alkali system. The method comprises the following steps of: pre-treating the nickel-molybdenum ore smelting smoke dust; performing oxidation leaching on the pre-treated nickel-molybdenum ore smelting smoke dust in an alkali leaching system; and performing selenium reduction reaction on oxidation-leached seleninic acid radical-containing leachate by taking at least one of formaldehyde and diammonium under an alkali condition to highly separate seleninic acid radical ions from other ions in the leachate to obtain high-purity selenium powder. The method is short in process flow, easy to operate, low in energy consumption, high in metal recovery rate and low in production cost, and a low-carbon and environment-friendly smelting aim can be fulfilled.

The invention discloses a preparation method of a plant selenium enrichment enhancer. The preparation method comprises the following steps of degrading carrageenan, reacting with seleninic acid or selenite so as to obtain the plant selenium enrichment enhancer taking selenium carrageenan as a selenium source. The preparation method is characterized in that HC1 replaces HNO3 to degrade carrageenan so that micromolecule carrageenan with the molecular weight lower than 1000 can be obtained, and a nano filtration membrane is used for filtering to control the proportion of carrageenan products with micromolecular weight; meanwhile, calcium salt is adopted for replacing barium salt to act as a catalyst of de-sulfation, and participates into the reaction to prevent of the use of the toxic barium salt. The raw material carrageenan of the plant selenium enrichment enhancer is extracted from seaweed, and is easily available; moreover, the preparation technology is simple, is easy to operate, is high in safety, and is low in production cost; the modular weight of the prepared product is below 1000; the plant selenium enrichment enhancer is high in activity, and is easy absorption and utilization by plants.

The invention discloses a microwave-assisted solvothermal synthesis method of I-III-VI semiconductor material nano-powder. The method comprises the following steps: adding metal salt and a sulfur source or selenium source into a beaker based on the mole ratio of an expected product, adding a solvent, evenly mixing and then transferring the obtained mixed solution to a microwave reaction kettle; after the reaction kettle is closed, heating the mixed solution to rated temperature in a microwave field, and performing heat preservation for rated time; and centrifugally washing the final product to obtain the target powder. In the method, the solvent is one or more of water, ethylenediamine, ethylene glycol, diamine and ethanol; the metal salt is the metal salt of Cu, In, Ga and Al; the sulfur source is thiourea or sulfur powder; and the selenium source is selenium powder or seleninic acid. The microwave-assisted solvothermal synthesis method has the beneficial effects that based on the heating and activation effect of the microwave field, reaction temperature is lowered and reaction time is shortened; and part of reaction that can not be made in the traditional high-pressure solvothermal synthesis process can be performed smoothly. The obtained semiconductor material nano-powder has the advantages of smaller grain size, pure phases, accurately controlled stoichiometric ratio of the phases and the like.

The invention discloses a method for planting selenium-enriched crops. The method comprises the following steps 1, a seleninic acid solution is mixed with an alkaline earth metal hydroxide solution orsuspension to be subjected to a reaction, or alkaline earth metal selenite powder and water are mixed to generate an alkaline earth metal selenite suspension or sol; 2, the alkaline earth metal selenite suspension or sol is uniformly sprayed to the surface of a plough covered with no water, then, ploughing and raking are performed on the plough, and then the selenium-enriched crops are planted. The method has the advantages that water insoluble selenite is adopted for performing disposable selenium supplementing on soil short of selenium, selenium can be stored into soil for a long time, andthe selenium-enriched crops can be planted for 300 years or longer according to a conventional tillage method; plants and excrement of people, livestock and poultry eating selenium-enriched agricultural products can be returned to the plough, and the selenium-enriched agricultural products can be permanently produced under the condition that selenium circulation is formed.

The invention discloses a potassium-boron-selenium fertilizer capable of promoting the growth of fruit trees and degrading residual pesticide. Seleninic acid is neutralized by potassium hydroxide, so that potassium selenite is obtained; diboron trioxide is dissolved in water, and is mixed with the potassium selenite, and thereby potassium-boron-selenium reagent with the PH value between 7.0 and 8.8 is prepared. The potassium-boron-selenium fertilizer has the multiple fertilizer effects of selenium fertilizer and conventional potash fertilizer and boron fertilizer, and when the potassium-boron-selenium fertilizer is sprayed on the surfaces of the leaves of fruit trees, not only can the fruit-setting rate be increased, but also residual pesticide can be degraded and the selenium content of fruits can be increased.

The invention provides a method for preparing yolk-shell structure Co9Se8 nano-particles. The process comprises the following steps: 1, respectively adding cobalt-nitrate hexahydrate (Co(NO3)2.6H2O) and glycerol into isopropyl alcohol to prepare a mixed solution, and performing ultrasonic stirring; 2, transferring the stirred mixed solution into a reaction kettle for hydrothermal treatment at 180DEG C for 3-9 hours, and centrifugally washing the powder generated in reactions to obtain a Co spherical precursor; and 3, preparing a mixed solution from the Co spherical precursor and deionized water, sequentially adding seleninic acid and hydrazine hydrate solution, stirring for 1-5 minutes, transferring the mixed solution into the reaction kettle for hydrothermal treatment at 140-200 DEG C for 12-36 hours, and centrifugally washing the powder after the reaction is completed to obtain the yolk-shell structure Co9Se8 nano-particles. The yolk-shell structure Co9Se8 nano-particles prepared bycontrolling reaction conditions of growth and selenylation of the precursor has a simple method, short production cycle and regular powder shape, and has an excellent application prospect in the field of ionic batteries.

Isoalantolactone derivatives and their application in preparation of drugs for treating inflammatory bowel diseases are provided, and an isoalantolactone derivative shown as in formula (I) is provided; a salt-forming acid is an inorganic acid or organic acid, the inorganic acid is selected from hydrofluoric acid, hydrochloric acid, hydrobromic acid, hydroiodic acid, sulfuric acid, nitric acid, phosphoric acid, carbonic acid, bromic acid, seleninic acid, phosphomolybdic acid, phosphorus acid and sulfurous acid, and the organic acid is selected from citric acid, maleic acid, D-malic acid, L-malic acid, DL-malic acid, L-lactic acid, D-lactic acid, DL-acid, oxalic acid, methylsulfonic acid, pentanoic acid, oleic acid, lauric acid, p-methylbenzene sulfonic acid, 1-naphthalene sulfonic acid, 2-naphthalene sulfonic acid, phthalic acid, tartaric acid, malonic acid, succinic acid, fumaric acid, glycolic acid, mercapturic acid, glycine, creatine, sulfonic acid, nicotinic acid, picolimic acid, isonicotinic acid, and benzoic acid or substituted benzoic acid.

The invention discloses a biological synthesizing method of nano-selenium. The biological synthesizing method comprises the following steps of using pure lemon juice; adding seleninic acid, magnetically stirring, adjusting the pH (potential of hydrogen) value by ammonia water, and vibrating by ultrasonic waves; heating in a water bath, and magnetically stirring; finally, centrifuging, so as to obtain the nano-selenium material. The biological synthesizing method has the advantages that by using the seleninic acid and the fresh lemon juice as the raw materials, the raw materials are pure plant,and the nano-selenium can be prepared at room temperature; the green and environment-friendly effects are realized, the reaction is moderate, and the template and catalyst are not needed.