90 results about "Bismuth citrate" patented technology

The invention provides a bismuth subcarbonate photocatalyst which is a bismuth subcarbonate nanometer sheet or a microsphere formed by the bismuth subcarbonate nanometer sheet. The bismuth subcarbonate photocatalyst provided by the invention is obtained by carrying out hydrothermal reaction on a bismuth source and soluble carbonate in an aqueous solution, wherein the bismuth source is bismuth citrate or bismuth citrate ammonia. The bismuth subcarbonate photocatalyst takes the bismuth citrate or the bismuth citrate ammonia as the bismuth source, and the nanometer sheet shaped bismuth subcarbonate or the microsphere formed by the bismuth subcarbonate nanometer sheet is obtained in a hydrothermal reaction mode. The morphology obtained by the bismuth subcarbonate photocatalyst can accelerate the separation and transmission of the photoproduction electrons and holes of the bismuth subcarbonate photocatalyst so as to inhibit the composition of the electrons and holes and accelerate the diffusion and transfer of reactants and reaction products; reflection is generated between rays and a nanometer layer; and the use ratio of the light source is increased so as to improve the catalytic activity of the bismuth subcarbonate photocatalyst. An experiment result shows that the removal rate on NO by the bismuth subcarbonate photocatalyst provided by the invention is 20-50%.

The invention discloses a preparation method for bismuth ferrite Bi2Fe4O9 monocrystal nanosheets. Ferric nitrate and ammonium bismuth citrate are employed as raw materials. Deionized water and nitric acid are added. An appropriate amount of potassium hydroxide is added to promote crystallization. The above mixture is subjected to a hydrothermal reaction at the temperature of 160-230 DEG C to obtain bismuth ferrite Bi2Fe4O9 monocrystal nanosheets. The preparation method is advantaged by simple technological process, easy control, no pollution and low cost, and is easy for large-scale production. The prepared products have stable crystallization quality, and have wide application prospects in fields of semiconductor gas sensors, catalysts and the like.

Bismuth-containing catalytic systems, formed using inorganic particles coated with at least one inorganic or organic bismuth compound that is catalytically active when polymerising polymers, characterised in that the inorganic bismuth compound is selected from the group comprising bismuth oxychloride, bismuth hydroxo-sulphate and bismuth carbonate, and in that the organic bismuth compound is selected from the group comprising bismuth acetate, bismuth benzoate, bismuth citrate, bismuth lactate and bismuth phthalate.

Environmentally friendly high performance minimum signature propellants have been demonstrated for use in next generation tactical missile applications. Bismuth salicylate and bismuth citrate have each been used in propellant formulations and evaluated for processing, ballistic, mechanical, aging and signature properties. These high performance formulations have potential to replace current formulations used in some fielded tactical systems. The propellant binder network is achieved using energetic nitramine polymers where inert polymers have been the polymer of choice for minimum signature propellants. The significance of this has to do with achieving propellant specific impulses greater than 245 seconds without nitroglycerin being used in the formulation. This improves propellant safety properties during the propellant processing and the manufacturing of the final missile configurations. The Army has mandated that the next generation propellant formulations show improvements in safety to the end users. These formulations are environmentally friendly (no-lead) and do not use nitroglycerin to achieve high performance.

The invention discloses a manufacturing method of bismuth citrate, bismuth oxalate and bismuth subsalicylate through electrolyzing and activating metal bismuth, which is characterized by the following: making new hyperfine bismuth with grain size at 20-350nm; reacting the strong hyperfine bismuth and organic acid to produce the product; simplifying the technique; reducing cost; improving impurity effectively without polluting the environment.

The invention provides a preparation method of bismuth citrate. The preparation method comprises the steps of 1, smashing bismuth oxide into specified average grain diameter; 2, preparing a citric acid aqueous solution with the predetermined concentration and heating to a predetermined temperature lower than the boiling point of water; 3, remaining the initial excess coefficient of citric acid in the citric acid aqueous solution below 1 according to the chemical reaction equation Bi2O3+2C6H8O7=2C6H5BiO7+3H2O and gradually adding the smashed bismuth oxide into the heated citric acid aqueous solution to ensure that the citric acid reacts with the bismuth oxide; 4, as the reaction progresses, gradually adding the citric acid aqueous solution with another concentration to keep the initial liquid-solid ratio; and 5, after the reaction is finished, filtering and drying to obtain the bismuth citrate product. The preparation method of the bismuth citrate, provided by the invention, has the advantages of no special requirements on equipment, easiness in the industrial production, simple process, convenience in operation and control, high yield and little impurity.

The invention discloses a preparation method of ranitidine bismuth citrate. The preparation method concretely comprises the following steps: (1) reacting ranitidine with bismuth citrate at the temperature of 90-95DEG C to obtain a solution containing ranitidine bismuth citrate; (2) cooling the solution containing ranitidine bismuth citrate to 50-60DEG C, adding activated carbon, preserving heat and decoloring for 20-30min; (3) carrying out suction filtration, adding the filtrate into homemade absolute ethyl alcohol and stirring and crystallizing, carrying out suction filtration, and drying a filter cake to obtain ranitidine bismuth citrate. The homemade absolute ethyl alcohol is obtained by adding sodium salt into the commercially available industrial-grade absolute ethyl alcohol, and stirring and filtering. According to the method, the trace impurities in the absolute ethyl alcohol can be greatly decreased, and further the maximum individual impurity in the ranitidine bismuth citrate can be reduced, the content of the maximum individual impurity can be reduced to less than 0.5%, and minimally to less than 0.3%, and the quality of products can be greatly improved.

The invention relates to a method for preparing a bismuth-series chemical product, comprising steps as follows: firstly, preparing ordinary-level bismuth oxide by refined bismuth; then preparing a bismuth-series chemical product by the ordinary-level bismuth oxide including steps of refined bismuth pulverization, bismuth low-temperature oxidation, ordinary bismuth oxide chemical conversion, and the like; finally preparing bismuth-series chemical products of bismuth nitrate, bismuth subnitrate, bismuth subcarbonate, bismuthsalicylate, basic bismuth salicylate, bismuth citrate, bismuth trichlor, bismuth oxychloride, electric bismuth oxide or bismuth oxide nanowire, and the like; and recycling chemically-converted mother-liquid. The invention has the advantages of generating no cancerigenic poison gas NOx and waste water, having environment protection, little consumption of chemical reagent, little energy consumption, low cost, simple device and operation, and the like.

Provided is a graphite-phase carbon nitride photocatalyst modified by basic bismuth carbonate. The graphite-phase carbon nitride photocatalyst comprises the chemical components of: in percent by mass,0.1-1.5% of basic bismuth carbonate and the balance graphite-phase carbon nitride, and the preparation method of the graphite-phase carbon nitride photocatalyst modified by the basic bismuth carbonate mainly comprises the steps of: adding 5-20 mg of bismuth citrate into every 30 g of urea, putting the urea and bismuth citrate into an agate mortar, performing full stirring, grinding and mixing for20 minutes, placing the obtained mixture in an alumina porcelain ark, then placing the porcelain ark in a muffle furnace for heat treatment, raising the temperature from a room temperature to 450-600DEG C at a heating rate of 2-30 DEG C per minute, performing thermal insulation for 1-2 hours, cooling to room temperature with the furnace, placing the obtained mixture in the agate mortar again, and grinding the mixture thoroughly into powder of 1-5 mum so as to obtain the graphite-phase carbon nitride photocatalyst modified by the basic bismuth carbonate. The graphite-phase carbon nitride photocatalyst has a preparation method with simple and easy operation, easily available raw materials, stable physical and chemical properties, environmental friendliness and high photocatalytic activity,and is beneficial to practical application and industrial production.

The invention discloses a preparation method of a bismuth ferrite BiFeO3 monocrystal micrometer sheet, which comprises the steps of: with ferric nitrate and ammonium bismuth citrate as raw materials, adding deionized water and adding quantitative potassium hydroxide for promoting crystallization, and carrying out a hydrothermal reaction at a temperature of 160-240 DEG C to prepare the bismuth ferrite BiFeO3 monocrystal micrometer sheet. The preparation method has the advantages of simple process, easy control, no pollution, low cost, and easy mass production. The prepared bismuth ferrite BiFeO3 monocrystal micrometer sheet is stable in crystallization quality, and has a wide potential application prospect in fields such as a transducer, a sensor, a storage and photocatalysis.