92 results about "Sodium Hydroselenite" patented technology

The invention discloses a novel preparation method of eucheuma gelatinae polysaccharide selenide. The selenylation of the eucheuma gelatinae polysaccharide is processed by sodium selenite being catalyzed by dilute nitric acid. The preparation method is simple, environment protecting, convenient and economic. The production shows higher biological activity, which can be applied widely in preparing the drug for inhibiting cancer cells, and has wide application prospect.

A method of preparing a trace element solution includes the steps of providing at least one EDTA-complex, providing a sodium selenite solution, and combining the EDTA-complex(es) and the sodium selenite solution to form a trace element solution. An EDTA complex is prepared by using disodium EDTA or EDTA acid, selenium, and any other suitable mineral.

The invention discloses a method for carrying out rich-selenium culturing of plelmtus eqngiu by utilizing sodium selenite. The method provided by the invention is characterized by comprising the following steps: mixing a rich- selenium culturing material additive the weight of which accounts for 1-10% of the total weight of a culturing dry material into the culturing dry material; culturing according to a common culturing method, thus obtaining rich-selenium plelmtus eqngiu, wherein the content of the selenium in the rich- selenium culturing material additive is 0.5-100mg / kg, the numerical values of the particle sizes of the particles of the rich-selenium culturing material additive are distributed in multiple different numerical vaue intervals within a range from 0.005mm to 5.0mm, the particles with the particle size of 1.0-5.0mm accounts for 10wt% of the total additive, and the particles with the particle size of 0.005-0.1mm at least accounts for 40wt% of the total additive; and the rich-selenium culturing material additive is prepared from the following raw materials in parts by weight: 100 parts of corn cob powder and 0.0011-0.022 part of sodium selenite. The plelmtus eqngiu cultured by the method has the advantages of high selenium utilization ratio and stable selenium content in batches; and the method ensures no hidden selenium contamination trouble and is convenient to operate and easy to popularize.

The invention discloses sargassum fusiforme polysaccharide functionalized nano-selenium as well as a preparation method and application thereof. The preparation method of the sargassum fusiforme polysaccharide functionalized nano-selenium comprises the following steps: uniformly mixing a sargassum fusiforme polysaccharide solution with sodium selenite by adopting a chemical reduction method, thenadding an ascorbic acid solution, carrying out water bath, and carrying out dialysis and freeze-drying to obtain a compound. The sodium selenite is used as a selenium source, the ascorbic acid is usedas a reducing agent, and the sargassum fusiforme polysaccharide (SFPS) is used as a modifier to prepare a polysaccharide nano-selenium compound (SFPS-SeNPs) with good stability and high solubility. The invention provides a new idea and new development for extraction of the sargassum fusiforme polysaccharide and development of selenium supplementing products. Compared with original nano-selenium particles, the sargassum fusiforme polysaccharide functionalized nano-selenium prepared by the invention has the advantages that the antioxidant activity is improved, and the antioxidant activity is not reduced after the sargassum fusiforme polysaccharide is compounded with the nano-selenium, so that the sargassum fusiforme polysaccharide functionalized nano-selenium is a polysaccharide nano-selenium compound with good stability and high solubility.

The invention relates to a protein-free, hydrolysate-free and serum-free culture medium and a preparation method thereof. The culture medium contains the following substances: manganese gluconate, calcium citrate malate, disodium edetate, progesterone, alanyl-glutamine,glycerophosphate, fructose, vitamin C, vitamin E, sodium selenite, hydroxypropyl-beta-cyclodextrin, cholesterol, malic acid, oxaloacetic acid, vitamin B12, lipoic acid, ferrous sulfate, ferric citrate, uric acid, taurine, reduced glutathione, zinc sulfate, copper sulfate and ferric nitrate. The protein-free, hydrolysate-free and serum-free culture medium has the advantages that the cost is low, the difference among different batches of products is small, the purification step of down-stream products is simplified, and potential safety hazards are reduced.

The invention discloses a method for improving the waxberry fruit soluble solid content. In the waxberry fruit development process, a sodium selenite or boric acid agent is sprayed to a waxberry tree. Sodium selenite is prepared into an aqueous solution with the 20-200mg.L-1 mass concentration in use, and boric acid is prepared into an aqueous solution with the 0-2g.L-1 mass concentration in use; the using mode is that in the period from 20 days after waxberry flowers wither to 30 days before waxberry fruits mature and are picked up, the concentration of the agent is adjusted, spraying processing is carried out on the waxberry tree 2-4 times with a sprayer, spraying is carried out every 7-21 days, and spraying is carried out until the leave faces of the waxberry tree is wet each time; production management is carried out according to daily management of a normal waxberry garden. The method is easy to implement and low in cost, the effect of improving the waxberry fruit soluble solid content is obvious, and the method has the obvious economic benefits and is suitable for being popularized and applied.

The invention relates to a bioactive artificial joint capable of slowly releasing trace element selenium. The artificial joint consists of a pure titanium or titanium alloy artificial joint matrix and a microporous sodium titanate surface layer loaded with trace sodium selenite and bone morphogenetic protein (BMP), wherein the sodium titanate bioactive layer with microporous structures is combined with the surface of the metal matrix and formed by mutually and alternately stacking the sodium titanate microporous structures generated by carrying out a hydrothermal reaction on the surface of the titanium or titanium alloy matrix and a sodium hydroxide solution, and the trace sodium selenite and the BMP are compounded in the microporous structures through centrifugal force and the effect of capillaries. A preparation method of the bioactive artificial joint comprises the following steps of: firstly, selecting a processed pure titanium or titanium alloy artificial joint; then obtaining the sodium titanate layer with the microporous structures on the surface of the titanium artificial joint by adopting an alkali liquor hydrothermal synthesis technology; and finally, loading the sodium selenite and the BMP in the microporous sodium titanate layer by adopting a centrifugal loading technology.

The invention discloses an optimizing method of a selenium-enriched yeast culture process. A novel sodium selenite adding mode is adopted, production of mycelium is unaffected, the utilization rate ofselenium is greatly increased, inorganic selenium is converted to organic selenium as much as possible, toxicity of the product is reduced, and high industrialized application is achieved; accordingto above results, shaking culture temperature is adjusted to be 23DEG C, initial to pH 6.0 and rotational speed to 120rpm; when a culture medium comprises, by weight, 1.0g / L of magnesium sulfate, 2.0g / L of sodium chloride, 0.5g / L of monopotassium phosphate and 2g / L of sodium selenite, sodium selenite is evenly divided into three equal parts which are added into the culture medium respectively in the first, second and third days of fermentation, about 11.4g dry weight of mycelium and about 331.7mug / g of enriched selenium can be obtained after 7 days of fermentation, and the conversion rate of organic selenium is up to 90.0%. Compared with the prior art, the selenium-enriched yeast culture process and the optimizing method have the advantages that cost is greatly saved and are suitable for modern industrial development.

The invention relates to a complexing template of nano ZnS or ZnSe crystal and a hydrothermal preparation method thereof. Glutin or chitosan salt is taken as the complexing template. The hydrothermal preparation method includes the following steps: heating zinc salt and complexing template agent at mass ratio of 1:1-10 for 1-8hours in water which is at mass ratio of 10-50 to zinc salt under constant temperature of 50-80 DEG C, then filtrating after cooling; adjusting the pH value to 9-12 through sodium hydroxide or ammonia, then adding sodium thiosulfate or sodium selenite at mass ratio of 0.5-5 to zinc salt; after dissolution, adding hydrazine hydrate or vitamin C at mass ratio of 0.5-10 to sodium thiosulfate or sodium selenite, after which clear and uniform solution can be obtained after dissolution; transferring the solution into a hydrothermal kettle and filling 60-90% of the hydrothermal kettle; rising the temperature to 120-240 DEG C and heating for 12-24h, then collecting the deposit and washing, after which nano crystals can be obtained. The invention takes glutin or chitosan salt which is cheap and low in toxicity as the soft template complexing agent for hydrothermal preparation of ZnS or ZnSe. In this way, nano crystals can be obtained, and adjusted to be rods or spheres in shape, with the diameter controllable within30-50nanometers and the length controllable within 20-70nanometers.

The invention discloses a method for preparing hollow ZnSe microspheres by an alcohol thermal reduction route. By using sodium selenite as a selenium source, ethylene glycol (EG) as a reducer and ethylene diamine tetraacetic acid (EDTA) as a complexant, one-step alcohol thermal reduction reaction is carried out in an EG-water mixed solution to prepare the hollow ZnSe microspheres. In the reaction process, no surfactant or any other template is needed, and the 140-220 DEG C hydrothermal reaction is carried out for 6-24 hours to obtain the zinc selenide hollow microspheres of which the diameter is 1-3 mu m and the wall thickness is 100-200 nm. The coordination of the EDTA with metallic ions in an alkaline environment has an important action on the formation of the hollow microspheres. The method has the characteristics of simple technical route and the like, is convenient to operate and is environment-friendly.

The invention discloses a photosynthetic bacterium with high yield nano-selenium and a preparation method of a nano-selenium living bacterium preparation thereof. The invention particularly disclosesthiocapsa roseopersicina capable of tolerating high-concentration (25g / L) sodium selenite. Nicotinic acid is creatively used for modifying high-concentration biological nano-selenium, so that the storage stability of the nano-selenium in the liquid is greatly improved. Meanwhile, the conversion rate of the nano-selenium is over 90 and thus nano-selenium fermentation liquid can be not subjected tocentrifugal purification, so that a liquid nano-selenium preparation which is relatively high in nano-selenium content, contains viable bacteria and is long in preservation time can be directly obtained. Problems that high-concentration biological nano-selenium prepared by the microorganisms in the prior art can not be stored in a liquid mode and easy transformation to black elemental selenium occurs frequently are solved and defects of high energy consumption and serious pollution are overcome. The nano-selenium living bacterium preparation has advantages of simple production process, low cost, low equipment requirement, no emission of three wastes, and environmental friendliness has the great market popularization value.

The invention discloses a preparation method of quercetin-loaded nano-selenium. The quercetin-loaded nano-selenium comprises the following raw materials: a reducing agent, a reaction solution and a selenium source, wherein quercetin is used as the reducing agent, sodium selenite (Na2SeO3) is used as the selenium source, the reaction solution contains a stabilizer and a mixed solvent of methanol and water, and the stabilizer is gum arabic (As). The preparation method comprises the following specific steps: preparing nano selenium particles for loading quercetin, firstly preparing the reaction solution containing the stabilizer, adding quercetin and sodium selenite substance into the reaction solution, stirring and reacting for a period of time at room temperature, then adding a proper amount of tween 80, continuously stirring, removing methanol by rotary evaporation, and freeze-drying to obtain the quercetin-loaded nano-selenium. The invention further discloses application of the quercetin-loaded nano-selenium in treating Alzheimer's disease. The invention aims to provide a preparation method and application of a medicament for treating Alzheimer's disease.

The invention discloses a super temperature-difference resistant and salt-mist corrosion resistant asphalt varnish prepared from the following raw materials in parts by weight: 20-24 parts of methyl organic silicon resin, 26-32 parts of vinyl resin, 4-6 parts of diaminodiphenyl-methane, 1-2 parts of benzotriazole, 4-5 parts of potassium polyacrylate, 3-5 parts of polyethylene glycol, 12-16 parts of modified asphalt, 7-9 parts of modified waste resin sand, 1-2 parts of sodium selenite, 0.5-1.0 part of an accelerant CMCM, 1-2 parts of cobalt naphthenate, 1-2 parts of triammonium citrate, 2-3 parts of aluminum stearate, 5-7 parts of polyacrylate, 1-2 parts of a silane coupling agent, 0.5-1.0 part of magnesium ammonium sulfate, 3-4 parts of floating beads, 2-3 parts of hollow microspheres, 6-9 parts of methylbenzene, 5-8 parts of dimethylbenzene and 6-9 parts of butanol acetate. By adopting the asphalt varnish disclosed by the invention, harms of the waste resin sand to the environment are solved, the production cost of the varnish is reduced, and the quality of the varnish is improved.

The invention belongs to the technical field of synthesis of nano-optoelectronic material, relates to a preparation method for a copper indium diselenide (CuInSe2) nanometer material, and in particular relates to a method for synthesizing a copper indium diselenide nanosheet through an ion exchange method. The method comprises the following steps of: synthesizing an In2Se3 (DETA) 0.5 precursor in a reaction kettle by adopting indium bromide and sodium selenite as reactants, and diethylenetriamine, hydrazine hydrate and deionized water as solvents; and by adopting the precursor powder and copper salt as the reactants, and glycol as the solvent, carrying out solvent thermal reaction in the reaction kettle to obtain the copper indium diselenide (CuInSe2) nanometer material. The indium diselenide nanosheet prepared by the method provided by the invention is the mesoporous material of which the average length is 3 micrometers and the width is 1.5 micrometers; the mesoporous material is provided with a plurality of pores; each nanosheet contains three elements which are respectively copper, indium and diselenide; and each element is uniformly distributed in the whole nanosheet. The method has the advantages of high reaction reproducibility, mild reaction condition, simple preparation method, low cost, high controllability, high product crystallinity, high output and purity, and is green and environment-friendly, and is expected for being used for mass production.

The invention provides a method for preparing nano nickel selenide with an octahedral structure, and belongs to the technical field of preparation of nano materials. The method is characterized by comprising the following steps of: adding 0.1314 gram of nickel sulfate hexahydrate and 0.0866 gram of sodium selenite into a 25-milliliter high-pressure reaction kettle with a polytetrafluoroethylene lining, adding 20 milliliters of ethylene glycol, stirring for 20 minutes, closing the reaction kettle, putting into a digital display temperature control furnace, and reacting for 24 hours at the temperature of 180 DEG C; and performing three times of centrifugal washing on the obtained sample, drying, and thus obtaining the product. An organic template and a surfactant are not required in the method, and the nano nickel selenide is synthesized in one step and has high yield and the octahedral structure; the method is simple, energy-saving and suitable for industrialized production; and the obtained octahedral nickel selenide has a good catalytic effect on decomposition of hydrazine hydrate.

The invention discloses a preparation method of ganoderan nano-selenium, the ganoderan nano-selenium and application thereof. The preparation method comprises the steps that 1 a sodium selenite solution and a ganoderan solution are mixed to be uniform, ascorbic acid is dropwise added, a constant-temperature stirring reaction is conducted, and a reaction solution is obtained; and (2) the reaction solution obtained in the step (1) is dialyzed to obtain a ganoderan nano-selenium solution. Sodium selenite is used as a selenium source, ascorbic acid is used as a reducing agent, ganoderan is used asa surface modifier, a surface-functionalized nano-selenium compound is prepared in a green mode, and the ganoderan nano-selenium prepared through the preparation process has the advantages of being small in particle size, good in dispersity, amorphous, low in toxicity and good in stability, and can be used as a medicine for preventing and / or treating cancers.

The invention belongs to the technical field of synthesis of environment-friendly nano material, relates to a synthesis method of the nano material, and particularly relates to a hydro-thermal synthesis method of cubic phase InSe nano sheet. The hydro-thermal synthesis method of cubic phase InSe nano sheet comprises the followings steps of: using a ternary hybrid solution of diethylenetriamine, hydrazine hydrate and water as solvent, carrying out hydro-thermal synthesis reaction on hydro-thermal synthesis aqueous solution and sodium selenite aqueous solution in a reaction kettle at 180 DEG C, rinsing by absolute ethyl alcohol, centrifugally separating, drying, and roasting, so as to obtain the nano material. Inferred from the growth mechanism, the method is suitable for the preparation of other selenium and tellurium metal compound nano materials. From the scanning electron microscope (SEM), after roasting, the nano sheet has high crystallinity, smooth surface and even size, and is 0.6-1.3microns in length, 0.5-1micron in width and 60nm in thickness, and most nano sheets are square. The preparation method has the following characteristics of simplicity, low cost, high controllability, high crystallinity of product, high yield, green and environmental protection.

The invention discloses anti-corrosion weather-resistant epoxy resin paint for copper sculptures. The anti-corrosion weather-resistant epoxy resin paint is prepared by, by weight, 1-4 parts of ethylene diamine tetraacetic acid disodium, 8-13 parts of polyether acrylate, 6-9 parts of isophorone diisocyanate, 3-4 parts of sodium selenite, 2-4 parts of aluminum naphthenate, 3-5 parts of bis(pentamethylene) thiuram tetrasulfide, 2-6 parts of ferrophosphorus powder, 4-5 parts of alpha-hydroxy isobutyrophenone, 3-4 parts of zinc gluconate, 1-4 parts of ammonium polyphosphate, 2-5 parts of zinc oxide, 6-8 parts of dipentaerythritol hexaacrylate, 28-36 parts of E-42 epoxy resin, 2-4 parts of pearl powder, 3-5 parts of antiager RD, 3-6 parts of tetrapropyl ammonium acetate, 4-8 parts of diaminodiphenyl sulfone and 3-4 parts of dicumyl peroxide. The anti-corrosion weather-resistant epoxy resin paint has the advantages of being resistant to radiation aging, capable of delaying environment corrosion, resistant to weather aging and especially capable of protecting outdoor copper sculptures.

The invention provides a feeding formula and a breeding method of a rex rabbit. The feeding formula is prepared by the following raw materials by weight percent; 24 percent of corn, 25 percent of wheat bran, 18 percent of soybean meal, 2 percent of shell powder, 10 percent of wild hay, 18 percent of sugar beet pulp and 3 percent of premixed material; the premixed material comprises stone meal, calcium hydrophosphate, table salt, diaminocaproic acid, methionine, ferrous sulfate, copper sulfate, zinc sulfate, manganese sulfate, 1% cobalt chloride, 1% iodine water, 1% sodium selenite and 50% choline. The feeding method is characterized in that the rex rabbit is fed three times a day; the high-frequency breeding method of the rex rabbit adopting the feed and the breeding method comprises the following steps: 1, carrying out the hybridization in 24 hours after the delivery of a female rabbit; 2, carrying out the hybridization and judging the pregnancy of the female rabbit from 23 at night to 4 in the morning; 3, enabling the female rabbit to be pregnant during the lactation period, and feeding the female rabbit with the feed with fish meal, silkworm chrysalis and eggs.

The invention relates to nano-selenium-zein composite nano-particle and a preparation method thereof, and belongs to the field of modern healthy food processing. The nano-selenium-zein composite nano-particle disclosed by the invention comprises elemental selenium and zein coating the elemental selenium. The preparation method comprises the following steps: (1) pouring a sodium selenite solution into a zein solution, and performing uniform mixing; and (2) adding ascorbic acid into the solution obtained in the step (1), and performing stirring or ultrasonic treatment to obtain the nano-selenium-zein composite nano-particle. The invention discloses the preparation of the nano-selenium particle by using zein for the first time, the prepared nano-selenium composite particle has the advantagesof good pH responsiveness and controllable particle size, and the problems of single nano-selenium particles and limited application scenarios in the prior art are solved.

The invention discloses a soil heavy metal capturing curing agent, and a preparation method and an application method thereof. The soil heavy metal capturing curing agent is composed of a component Aand a component B; the component A is composed of dimethyldithiocarbamic acid sodium salt, trimercapto-s-triazine trisodium, and gamma-glutamic acid; and the component B is composed of biochar, selenium dioxide or equal amount of sodium selenite, humic acid and fulvic acid mixture, EM bacteria, and large, medium, and trace element water soluble fertilizers. The soil heavy metal capturing curing agent is capable of complexing heavy metal ions, and realizing one time processing of coexist metals; obtained flocculating constituent is large; capturing deposition is rapid; stabilizing time is long;heat resistance and acid and alkali resistance are excellent; and pollution is low.

The present invention provides a pigeon health-care sand which consists of the following components in parts by mass: 45-50 parts of oyster shell tablets, 8-10 parts of medium sand, 6-8 parts of yellow mud, 1.4-1.8 parts of stone grains, 0.5-0.8 part of calcium bicarbonate, 0.2-0.3 part of calcium hydrogen phosphate, 0.1-0.3 part of alum, 1.2-1.5 parts of vermiculite, 0.8-1.2 parts of cattle bone meal, 2-4 parts of matured plaster, 1-2 parts of red iron oxide, 0.1-0.3 part of sodium selenite, 3-5 parts of edible salt, 1.2-1.6 parts of charcoal, 0.1-0.3 part of oxytetracycline hydrochloride, 0.2-0.3 part of yeast powder, 0.7-0.9 part of gentiana scabra, 1.2-1.6 parts of liquorice, 0.5-0.8 part of methionine, 0.2-0.4 part of lysine, 0.01-0.02 part of compound vitamin, and 0.2-0.4 part of egg shells. The pigeon health-care sand is rich in nutrition, and can improve pigeon egg production and enhance disease resistance.

The present invention provides a pigeon health-care sand which consists of the following components in parts by mass: 45-50 parts of oyster shell tablets, 12-15 parts of medium sand, 6-8 parts of red earth, 0.2-0.3 part of calcium bicarbonate, 0.2-0.4 part of alum, 1.2-1.5 parts of vermiculite, 0.5-0.8 part of sucrose, 0.8-1.2 parts of cattle bone meal, 0.5-0.8 parts of matured plaster, 2-4 parts of limestone, 1-2 parts of ferrum dioxide, 0.1-0.3 part of sodium selenite, 2-4 parts of edible salt, 1.2-1.6 parts of charcoal, 0.1-0.3 part of oxytetracycline hydrochloride, 0.7-0.9 part of gentiana scabra, 1.4-1.8 parts of liquorice, 0.5-0.8 part of methionine, 0.2-0.4 part of cystine, 0.01-0.02 part of compound vitamin, and 0.3-0.5 part of egg shells. Each component is pulverized, mixed uniformly and dried. The pigeon health-care sand can improve pigeon egg production.

The invention discloses a preparation method and an application of nano-selenium, and belongs to the technical field of nano-selenium. The method comprises the following steps: mixing a polyvinyl alcohol solution with a sodium selenite solution, dropwise adding an ascorbic acid solution into the mixed solution, and carrying out ultrasonic reaction to obtain nano-selenium. The preparation conditionis normal pressure, the reaction temperature is low, the reaction time is short, the whole preparation process is safe and stable, the method is convenient to master and control and easy to implement, the raw materials are low in cost, non-toxic and harmless, the obtained product is uniform in particle size, small in particle size, good in crystallinity and good in water solubility and biocompatibility, the oxidation resistance of the nano-selenium is verified through experiments, and a good foundation can be provided for research and application of the oxidation resistance of the nano-selenium in the future.

The present invention discloses a medicine for preventing and treating cattle and sheep flaccid paralysis diseases and relates to the technical field of agricultural breeding. Each liter of the medicine contains the following substances: 7 million-11 million units of vitamin A palmitate, 4 million-6 million units of vitamin D3 ethyl acetate, 10-30 g of vitamin E ethyl acetate, 15-25 mg of 25-hydroxycholecalciferol, 100-150 g of calcium gluconate, 500-800 mg of sodium selenite, 50-100 g of butafosfan, 2.5-6 g of adenosine triphosphate, 30-60 g of inositol, 100-150 g of an emulsifier, 20-30 g ofa co-emulsifier, 10-15 g of an antioxidant, 30-50 g of a surfactant and the balance purified water. The medicine can effectively reduce levels of stress hormones in body, increase concentration of insulin, significantly improve liver functions, and promote rapid use of energy while supplementing calcium so as to strengthen muscle functions, enhance vitality, enhance physical fitness, prevent andtreat the cattle and sheep flaccid paralysis diseases, and is high in absorption and utilization rates at the same time.

" The invention discloses a heavy metal ion polluted soil repairing material, and a preparation method thereof. The heavy metal ion polluted soil repairing material is prepared from, by weight, 40 to 50 parts of aedelforsite, 1 to 2 parts of calcium aluminate, 1 to 2 parts of a polydimethylsiloxane diquaternary ammonium salt, 1 to 2 parts of trimethylsilyl phosphate, 0.5 to 1 part of methylisothiazolinone, 0.5 to 1 part of Carbaldrate, 0.5 to 1 part of sodium germanate, 0.3 to 0.5 part of sodium selenite, 0.2 to 0.8 part of barium metaborate, and 0.1 to 0.4 part of poly(3,4-ethylenedioxythiophene). The invention also provides the preparation method of the heavy metal ion polluted soil repairing material.

The invention provides S,Se-CQDs and a method for efficiently detecting Cr(VI) pollutants by using the S,Se-CQDs, and belongs to the field of nanometer new materials and environmental analysis crossing. The preparation method comprises: dissolving citric acid, mercaptoethylamine and sodium selenite into pure water, naturally cooling to a room temperature after carrying out a hydrothermal reaction,taking out the solution, carrying out centrifugation, separating the supernatant, dialyzing the centrifugation, and carrying out freeze-drying to prepare the doped carbon quantum dots S,Se-CQDs withhigh fluorescence intensity. According to the invention, the S,Se-CQDs preparation process is simple, the cost is low, and the prepared S,Se-CQDs can efficiently detect Cr(VI); when a proper amount ofvitamin C (Vc) is added, the fluorescence of the system comprising Cr(VI) and S,Se-CQDs can be recovered by 80%; and the method for detecting Cr(VI) through S,Se-CQDs is simple, low in cost, obviousin selection difference and high in anti-interference capacity.

The invention discloses a preparation method and application of grateloupia filicina polysaccharide-nano-selenium and belongs to the technical field of functionalized nano-selenium. According to the method, a grateloupia filicina polysaccharide solution and a sodium selenite solution are mixed, an ascorbic acid solution is dropwise added to the mixed solution, and ultrasonic reaction is conductedto obtain the nano-selenium. The selenium is prepared to be at a nano level, and the obtained nano-selenium has very high bioactivity and bioavailability. The nano-selenium has lower toxicity than traditional selenium products, and a new idea and new development are provided for developing selenium supplement products. Polysaccharide and the nano-selenium are combined, drug administration advantages of a nano-carrier are reserved, and template activity is also reserved. The polysaccharide-nano-selenium becomes a new method for preparing food or medical nano-selenium.

The invention relates to a Zn-Cu-Se composite material and a preparation method and application thereof. The preparation method of the Zn-Cu-Se composite material comprises the following steps: (1), dissolving soluble zinc salt, soluble copper salt, urea and ammonium fluoride in water, performing a primary hydrothermal reaction after even stirring, and obtaining a Zn-Cu precursor through centrifugation, washing and drying; and (2) dissolving the prepared Zn-Cu precursor and sodium selenite in water, stirring and dispersing, adding ammonia water to form a uniform suspension, carrying out a second hydrothermal reaction, and obtaining the Zn-Cu-Se composite material through centrifuging, washing, and drying. Compared with the prior art, the Zn-Cu-Se composite material is synthesized through two-step hydrothermal synthesis, the composite material has good electrochemical performance, the preparation method of the composite material is simple and environmentally friendly, and the synthesistime is greatly shortened.

The invention discloses a quenching agent for wear-resistant materials, which comprises additives and carriers. The raw materials in the formula comprise the following components in percentage by weight: 0.5-1.5% of zinc chloride, 10-30% of citric acid, 10-30% of pine oil, 10-30% of deionized water, 1-3% of sodium hydroxide, 1-3.5% of ultrafine sodium selenite and 10-40% of sodium metasilicate. The products prepared by the method can enable the oxide skins on the surfaces of quenched parts to interact with each other for producing hydrogen, therefore, the oxide skins can quickly get off, the surfaces of the quenched parts present bright silvery white, and the quenched parts have small deformation, are not easy to crack and possess smooth and bright surfaces.