2326 results about "Sodium borohydride" patented technology

By using the soluble salt of transition metalz Zn, Cd, Pb, Mn, Co, Ni, Cu, Ag, Sb and Bi, selenious acid or its solutl salt, or antimonous acid or its soluble salt as raw material, and hydrazine hydrate, sodium borohydride, potassium borohydride, hydroxylamine or hydrazine sulfate as reductant, and through hydrothermal reduction reaction at 100-200 deg.c in a sealed container for 2 hr to 5 days, selenides or tellurides of the said metals as semiconductor material may be synthesized. Unlike available synthesis process, which needs high temperature, toxic feedstock and complex technological course, the present invention has the advantages of low-cost material, simple apparatus, easy control, good technological reproducibility, stable product quality, etc.

The invention discloses a method for preparing antibacterial nanometer silver colloid, belonging to the technical field of nanometer biological materials. The method uses a chemical reduction method, comprising the following steps: dissolving water-soluble protective agent in silver nitrate water solution with the concentration of 0.001-0.1mol/L, wherein the mass ratio of protective agent to silver nitrate is 0.5-10.0:1; carrying out ice bath on sodium borohydride water solution with the concentration of 0.001-0.2mol/L for 10-30min; and dropwise adding the silver nitrate water solution containing protective agent in the sodium borohydride water solution with the speed of 30-60 drop/min, stirring by a magnetic stirrer, stirring for 20-40min after dropwise adding to prepare the nanometer silver colloid with the grain size of 5-80nm, wherein the mol ratio of the sodium borohydride to the silver nitrate is 1.0-30.0:1. The nanometer silver colloid prepared by the invention has the advantages of high concentration, high stability, high dispensability, and obviously-enhanced antibacterial property.

The invention relates to a preparation method of a triangular silver nanosheet, which comprises the following steps: firstly, mixing three types of reagents of oxyacid silver, trisodium citrate (Na3C6H5O7.2H2O) and polyvinyl pyrrolidone (PVP) according to a certain molar ratio; stirring for 4-10min at the temperature of 0 DEG C-30 DEG C; adding a proper amount of sodium borohydride (NaBH4) reagent into the mixed system; and then, adding a proper amount of hydrogen peroxide the mass fraction of which is 10%-30% to finally obtain the triangular silver nanosheet the size of which is 50nm-120nm. The method for preparing the triangular silver nanosheet has simple operation and high success ratio and can be carried out at normal temperature.

The invention provides a novel nanometer silver particle/graphene conductive compound material, which belongs to the technical field of compound materials. The preparation method of the material comprises the following steps of: ultrasonically dispersing oxidized graphite in water for 1 to 2 hours, adding silver nitrate solid, keeping ultrasonically dispersing for 25 to 30 minutes, raising the temperature to 70 to 80 DEG C, adding sodium borohydride for reflux reaction for 1 to 2 hours, thermally filtering, washing, drying and grinding to obtain the Ag/graphene nanometer conductive compound material. The Ag/graphene nanometer conductive compound material can be prepared by a one-step reduction method, which is simple in process, convenient in operation, mild in reaction and high in production efficiency; in the prepared conductive compound material, the nanometer silver particles are uniformly absorbed on the edge of the graphene so as to form a conductive network where Ag and the graphene are staggered mutually; therefore, the dispersion of the nanometer silver particles is improved, and the thermal stability and the conductivity of the graphene are enhanced; and the Ag/graphene nanometer conductive compound material has a good industrial production prospect.

The nanometer mirror spraying process includes the following steps: 1. eliminating surface dust; 2. spraying primer; 3. sensitizing and activating treatment; 4. spraying solution A comprising silver nitrate solution, ammonia water solution and sodium hydroxide solution and solution B comprising sodium borohydride, potassium borohydride or p-methylaminophenol sulfate solution in the volume ratio of 1 to 1-1.7 to produce reduction; 5. shaping and developing; 6. blowing to dry; and 7. drying. The present invention has the advantages of diversified products, high corrosion resistance, suitability to mass production, high hardness, low cost, etc.

A compact solid source of hydrogen gas, where the gas is generated by contacting water with micro-disperse particles of sodium borohydride in the presence of a catalyst, such as cobalt or ruthenium. The micro-disperse particles can have a substantially uniform diameter of 1-10 microns, and preferably about 3-5 microns. Ruthenium or cobalt catalytic nanoparticles can be incorporated in the micro-disperse particles of sodium borohydride, which allows a rapid and complete reaction to occur without the problems associated with caking and scaling of the surface by the reactant product sodium metaborate. A closed loop water management system can be used to recycle wastewater from a PEM fuel cell to supply water for reacting with the micro-disperse particles of sodium borohydride in a compact hydrogen gas generator. Capillary forces can wick water from a water reservoir into a packed bed of micro-disperse fuel particles, eliminating the need for using an active pump.

The present invention relates to the use of triborohydride salts as hydrogen storage materials. The present invention also relates to a system of using triborohydride salts to generate hydrogen gas for use in a fuel cell or other hydrogen-consuming device. A novel method of preparing triborohydride salts is also disclosed, wherein gaseous diborane is reacted with a carbonate suspended in a non-aqueous solvent in a suitable vessel with agitation. The process is typically carried out utilizing sodium carbonate to form sodium triborohydride. Other triborohydride salts can then be formed by cationic exchange. Hydrogen generating fuels according to the present invention include aqueous or hydroalcoholic solutions or slurries of a triborohydride salt, which may additionally contain a borohydride salt to provide operation over a broader temperature range.

The invention discloses a preparation method of antibacterial silver/chitosan nano fibrous membranes, pertaining to the preparative technologies of nano composite fibrous membranes. The process of the method includes that a chitosan hexanoic acid solution, a silver nitrate aqoeous solution, a sodium borohydride water solution and an ethylene epoxide hexanoic acid solution are prepared and mixed to form compounded latex according to the volume ratios of the chitosan hexanoic acid solution and the silver nitrate aqoeous solution as well as an NaBH4 aqueous solution. The compounded latex and the ethylene epoxide hexanoic acid solution are mixed according to the volume ration to prepare a spinning solution, then the spinning solution is added into an injector in an electrostatic spinning device and electrostatic spinning is carried out to form the fibrous membrane. Crosslinking treatment is carried out to the fibrous membrane to obtain the antibacterial silver/chitosan nano fibrous membrane. The antibacterial silver/chitosan nano fibrous membrane of the invention has the advantages that the preparation process is simple; the prepared membrane material has broad-spectrum bactericidal property and comparatively high fatality rate to Bacillus coli, Bacillus subtilis, Staphylococcus aureus and Pseudomonas aeruginosa for 24 hours.

A functionalized graphene supported nickel palladium bi-metal nanometer catalyst, and preparation and applications of the catalyst are provided. A preparation method does not include a high-temperature hydrothermal reaction or a step of adding other catalysts, and only includes adding nickel chloride (NiCl2) and sodium tetrachloropalladate (Na2PdCl4) which are metal precursors into a mixed solution of 3-aminopropyl-3-ethoxysilane (APTS) and graphite oxide (GO), rapidly reducing Ni<2+> and Pd<2+> ions into NiPd metal particles by utilizing sodium borohydride (NaBH4) and allowing the metal particles to grow on a -NH2-functionalized graphene substrate (NiPd/N-FG). The prepared nickel palladium metal nanometer particles are uniformly distributed on the substrate and have a very small particle size (1.2-2.4 nm). The synthesized Ni<0.4>Pd<0.6>/N-FG catalyst still has extremely good catalytic performance when the content of the non-noble metal Ni accounts for 40% of the total metal content. The method is simple, effective and low in cost, overcomes problems such as long synthesis time, high synthesis temperatures, and high nanometer particle sizes, and promotes practical application of formic acid as a hydrogen storage material in fuel cells and vehicle-mounted mobile hydrogen source materials.

The invention relates to a detection technology of copper ions, and in particular relates to a preparation method of a reduced carbon quantum dot containing calcium alginate gel for detecting copper ions. The preparation method of the carbon quantum dot containing calcium alginate gel for detecting the copper ions comprises the following steps of: preparing fluorescent carbon quantum dots; neutralizing the fluorescent carbon quantum dots, adding sodium borohydride into the neutralized fluorescent carbon quantum dots to perform reduction; mixing deionized water with the neutralized fluorescent carbon quantum dots at equal volume, and adding sodium alginate into the mixture to obtain a sodium alginate sol; and spraying a calcium ion solution to the surface of the sol or soaking the sol into the calcium ion solution to perform crosslinking, and drying to obtain the calcium alginate gel. By using the characteristics that the carbon quantum dots have fluorescent characteristics, the fluorescence of the carbon quantum dots is enhanced after reduction, and the calcium alginate can enhance the fluorescent characteristics of the carbon quantum dots, when the copper ions are detected, the cost of an adopted fluorospectro photometer is low, the sample preparation and treatment steps are simple and easy to operate, and the detection sensitivity is high, so that the calcium alginate gel can be widely used for detecting the copper ions.

The invention discloses a nanogold solution and a method for detecting Co<2+> by using the same. The water soluble functional nanogold solution is prepared by using a gold salt as the resource of gold nanoparticles, a quaternary ammonium salt as a surfactant, ion clusters containing sulfur elements and carbon oxygen groups (O=C=O) as ligands, sodium borohydride, potassium borohydride or ascorbic acid as a reducing agent, and deionized water as a synthesis medium and by modifying the surface of the nanogold with the ion clusters containing sulfur elements and carbon oxygen groups (O=C=O) under the action of gold-sulfur bonds (Au-S). The nanogold solution has high speed, selectivity, sensitivity and practicality for detection of trace amount of Co<2+> in the water solution system, and therefore can be used in combination of a colorimetric process for detecting trace amount of Co<2+>; the detection concentration is lower than 8.5*10<-7>M; the detection threshold value may reach 5*10<-10>M; the detection speed is high, the selectivity is high, the cost is low, and the carrying is convenient; and the detection method has a bright application prospect in fields of environmental science, detection chemistry and analysis chemistry, and the like.

The invention relates to an alkaline buffering solution for establishing a DNA coding compound library and an application thereof. The alkaline buffering solution is a boric acid buffering solution with the concentration of 250mM, the electric conductivity of the boric acid buffering solution is 5177ppm+/-10 percent, the density is 1.0246 g/mL+/-3 percent, and the pH is 9.4+/-0.1. The buffering solution has the characteristics of wide substrate application range and high universality and is applied to the amide synthetic reaction of DNA-CO2H and small molecular organic amine and applied to thereduction ammonolysis reaction for generating imine from DNA-NH2 and small molecular organic aldehyde and reducing the imine by virtue of sodium borohydride, and has the advantage of high conversionrate. The various alkaline buffering solutions prepared in the invention and used for synthesizing the DNA coding compound library is mild in reaction conditions, simple in operation, wide in substrate application range, relatively high in applicability and suitable for the mass synthesis of the DNA coding compound library.

The invention relates to a MoSe2/Co0.85Se composite material for electrocatalytic water decomposition. The microtopography of the composite material is that a micron/nano rod of a MoSe2/Co0.85Se compound is loaded with a nano sheet of a molybdenum selenide/cobaltous selenide compound; the micron/nano rod has the length of is 1.5 to 3.5 microns and a diameter of 0.2 to 0.5 micron. A composite-material precursor CoMoO4 is firstly prepared and obtained through a hydrothermal reaction by using cobalt nitrate and sodium molybdate as reactive raw materials; afterwards, the composite material is made through the hydrothermal reaction by using sodium borohydride, selenium powder and the prepared composite-material precursor as raw materials. A preparation method of the MoSe2/Co0.85Se composite material is simple; the raw materials are easily obtained; the cost is low; the industrialized production is easily realized; the prepared and obtained composite material is good in electrocatalytic effect, and further, has favorable stability.

The invention discloses a carbon quantum dot/aurum cluster ratiometric fluorescent probe for detection of cadmium ion and ascorbic acid. A preparation method comprises the following steps: preparing CQDs (Carbon Quantum Dots) from alanine and histidine through a one-step hydrothermal method; performing amino-functionalization on the CQDs by using 3-aminopropyltriethoxysilane, wherein the CQDs which are subjected to the amino-functionalization serve as a reference chromophore; reducing chloroauric acid through sodium borohydride by taking 11-sulfydryl undecanoic acid as a surfactant to obtain MUA-modified AuNCs (Aurum Nano Clusters), wherein the MUA-modified AuNCs serve as a main fluorophore of the ratiometric fluorescent probe; finally, coupling the CQDs and the AuNCs through an amidation reaction to obtain the CQDs/AuNCs ratiometric fluorescent probe. On the basis of static quenching and inter-filtering effects, the fluorescence of the CQDs/AuNCs can be quenched by Cd<2+>; the invention discloses the application of the CQDs/AuNCs ratiometric fluorescent probe in Cd<2+> detection. The fluorescence of the CQDs/AuNCs which is quenched by the Cd<2+> can be recovered by the ascorbic acid, so that the ratiometric fluorescent probe can also be used for the detection of AA (Ascorbic Acid). The ratiometric fluorescent probe disclosed by the invention has the lower detection limit of 32.5 nM to the Cd<2+>, has the lower detection limit of 0.105 muM to the AA, and has an application value in the detection of the cadmium ion and the ascorbic acid.

The invention discloses a preparation method of a tungsten diselenide nanosheet, and belongs to the technical field of nanometer material preparation. The preparation method comprises the following steps of dissolving sodium borohydride into an organic solvent, and successively adding selenium powder and sodium tungstate to prepare a mixed solution; transferring the mixed solution to a reaction kettle, and performing reaction for 6 to 48 hours at 200 DEG C to 240 DEG C; after the temperature of the reaction kettle is naturally cooled to the room temperature, collecting black products through suction filtration; washing the product by deionized water and ethyl alcohol; freezing and drying the washed product to obtain the tungsten diselenide nanosheet. The invention provides the method for synthesizing the tungsten diselenide nanosheet in one step by a solvothermal method for the first time. The preparation method has the advantages that the raw materials are green and environment-friendly; the cost is low; the yield is high; the reaction condition is mild; the scale production can be realized. The high-crystallization tungsten diselenide nanosheet prepared by the method has the advantages that the size is great; the layer number is small; the distribution is uniform; the specific surface area is high; high application prospects are realized in the fields of catalysis, energy storage and the like.

The present invention provides a process for producing copper nanoparticles, comprising steps of: a) reacting an aqueous solution containing a reductant with an aqueous solution of a copper salt while stirring for 1-8 min, wherein the reductant being one or more selected from a group consisting of hydrazine hydrate, sodium borohydride and sodium hypophosphite; b) adding an apolar organic solution containing the extracting agent and continuing the stirring for 0.5-1.5 hrs, said extracting agent being one or more selected from the group consisting of alkyl dithiocarbonic acid and salts thereof, O,O′-dialkyl dithiophosphoric acid and salts thereof, and dialkylamino dithioformic acid and salts and said apolar organic solution being one selected from the group consisting of benzene, toluene and straight or branched alkanes having 6-12 carbon atoms, wherein the alkyl having 6-20 carbon atoms; and c) post-treating the reaction product to obtain copper nanoparticles.

Electrochemical processes and apparatus for obtaining metals from metal salts, particularly separating alkali metal and borate ions from alkali metal borate compounds, are disclosed. Aqueous solutions of metal borates or metal carbonates are converted to metals by preferred electrochemical processes. These electrochemical processes also may be integrated into processes for the production of borohydrides, such as sodium borohydride.

The invention relates to a charcoal loading nanometer zero-valent iron activated sodium persulfate system and preparation and application thereof. Firstly, biomass is burned into charcoal, the charcoal is cleaned and dried after being acidized, and added into a ferrous sulphate solution taking absolute ethyl alcohol and water as a dispersing agent for being stirred fully, then a sodium borohydridesolution is added dropwise to generate the charcoal loading nanometer zero-valent iron; lastly, a composite material prepared with pure water and ethyl alcohol is washed and dried, the obtained charcoal loading nanometer zero-valent iron activated material is placed in the solution, after ultrasonic treatment is carried out, the material is uniformly dispersed in the solution, at the moment, a sodium persulfate solution is added, the mixture is mixed evenly to obtain the charcoal loading nanometer zero-valent iron activated sodium persulfate system. The oxidation system is used for reducing waste, polluted surface water and target pollutants in the underground water, and the problems of the agglomeration and lower activity of sodium persulfate during the use of the nanometer zero-valent iron are solved.

The invention discloses nanoscale zero-valent iron stable in air, wherein nanoscale zero-valent iron is taken as a core, and silicon dioxide is covered on the surface thereof. The preparation method comprises the following steps of: (1) adding isopropanol aqueous solution in ferrous sulphate, charging nitrogen, mechanically stirring for 15 to 30 minutes, dropping sodium borohydride solution containing sodium hydroxide while stirring, after that, adding polyethylene glycol, and continuing to react for 0.5 to 1 hours while stirring; (2) adding tetraethoxysilane in the solution, controlling the molar ratio of the sodium hydroxide to the sodium borohydride in the solution to be in a certain range, continuously stirring, and continuously charging nitrogen, after the reaction is finished, staying, vacuum-filtrating, then washing by absolute ethyl alcohol and deionized water respectively; and (3) vacuum-drying the obtained nano-iron to obtain the stable nanoscale zero-valent iron. The nanoscale zero-valent iron has a good inoxidizability in air; and the whole reaction process has the advantages of low material price, simple device, convenient operation, and easily-controlled and safe process condition.

The invention relates to a preparation method of graphene aerogel and graphene-carbon nanotube aerogel. According to the method, graphene oxide or a mixture of graphene oxide and carbon nanotube is subjected to drying treatment; graphene oxide is reduced through a magnesium thermal reaction; the material is soaked in an acidic water solution; and impurities are removed, and the material is dried, such that graphene aerogel or graphene-carbon nanotube aerogel is obtained. Compared with prior arts, the method provided by the invention has the advantages of simple process, and is green and environment-friendly. Magnesium powder is adopted as a reducing agent. Compared to reducing agents such as hydrazine hydrate, sodium borohydride, formaldehyde, carbohydrate compounds, ascorbic acid and hydroiodic acid, magnesium powder has higher reducibility, such that the graphene aerogel or graphene-carbon nanotube aerogel with high carbon-oxygen ratio can be prepared. The electrical conductivity of the graphene aerogel or graphene-carbon nanotube aerogel can reach 10<4>s/cm. The graphene aerogel or graphene-carbon nanotube aerogel has large specific surface area, and is non-toxic and harmless. The graphene aerogel or graphene-carbon nanotube aerogel can be widely applied.