8 results about "Sodium bismuthate" patented technology

The application provides a method for preparing carbon nitride-carbonate bismuth oxide composite nanosheets by a molten salt one-pot method, sodium bismuthate, melamine and sodium nitrate are mixed and uniformly ground to obtain a solid mixture; the solid mixture is heated at 350 DEG C, sodium nitrate is molten to form an ionic molten salt medium, and a one-pot reaction is simultaneously carried out in the medium: sodium bismuthate and melamine are converted into carbonate bismuth oxide through an oxidation-reduction reaction, melamine is simultaneously converted into graphite phase carbon nitride through a polymerization reaction, and the synergistically generated carbonate bismuth oxide and graphite phase carbon nitride are in-situ compounded to form g-C3N4-Bi2O2CO3 composite nanosheets. The application is based on a synthesis strategy of realizing multiple chemical reactions in a single molten salt environment, in-situ compounding to form a heterojunction, and simultaneously generating g-C3N4 and Bi2O2CO3 in one step and in-situ bonding, and the preparation steps are simple, the operation is convenient, the reaction conditions are mild, and the method is suitable for industrial production.

The application provides a method for preparing bismuth trioxide-cuprous oxide nanocomposite based on a synergistic reaction, which comprises the following steps: dispersing sodium bismuthate, sodium sulfite and cuprous chloride in deionized water to obtain a solid-liquid mixture; and placing the solid-liquid mixture under a hydrothermal condition, so as to in-situ prepare the Bi2O3-Cu2O nanocomposite through the synergistic effect of the redox reaction between sodium bismuthate and sodium sulfite in the system and the anion exchange reaction between cuprous chloride and hydroxyl ions generated in-situ. The application is based on the synergistic effect of the redox reaction and the anion exchange reaction under the same hydrothermal condition, and high-purity Bi2O3-Cu2O nanocomposite can be prepared in-situ in one step without adding an alkali source and a template agent. The prepared composite can effectively form a p-n heterojunction, significantly inhibit the recombination of photo-generated carriers, improve the photocatalytic activity and redox capacity of the material, and the preparation process is simple, green and economical, and easy for industrialized production.

The invention discloses a preparation method and application of a Bi / SnO2 difunctional electrocatalyst, and the preparation method comprises the following steps: providing a reduction environment by using the combined action of polyvinylpyrrolidone and ethylene glycol, reducing sodium bismuthate into spherical elemental Bi with a regular shape by a hydrothermal synthesis method, and then combining the spherical elemental Bi with SnO2 through rapid centrifugation and vacuum heating to obtain the BiSnO2 difunctional electrocatalyst. Thus, the Bi / SnO2 bifunctional catalyst is obtained. The path of hydrothermal synthesis of the bismuth elementary substance is optimized, the two catalyst materials are tightly combined through heating treatment on the basis, reaction active sites are increased, the obtained catalyst is stable in structure, the catalytic performance is obviously improved, formic acid preparation through electro-catalysis can be promoted at the same time on the cathode and the anode, high selectivity and Faraday efficiency are achieved, and the method is suitable for industrial production. And the original morphology is still maintained after long-time working.

This invention provides a method for preparing bismuth titanate nanoparticles using molten salt assistance. Sodium bismuthate dihydrate, sodium sulfite, titanium sulfate, and sodium nitrate are mixed and ground uniformly to obtain a solid mixture. The solid mixture is then heated at 350°C to melt the sodium nitrate, creating an ion-molten liquid environment. Under this environment, a redox reaction between sodium bismuthate dihydrate and sodium sulfite generates the transition product bismuth oxysulfate, producing sodium hydroxide and creating a self-generated alkaline condition. Simultaneously, under this self-generated alkaline condition, bismuth oxysulfate reacts with titanium sulfate to form bismuth titanate. The reaction product is then post-processed to obtain Bi... 24 Ti2O 40 Nanoparticles. The advantages of this invention are: a synthesis strategy based on an ion-molten liquid environment, accelerated reactant diffusion, and improved chemical reaction efficiency to prepare Bi. 24 Ti2O 40 Nanopowders are easy to prepare, convenient to operate, have a mild reaction, and are low in cost, making them suitable for industrial production.

This invention provides a method for preparing bismuth cuprate nanopowder with molten salt assistance. Sodium bismuthate dihydrate, sodium sulfite, copper sulfate, and sodium nitrate are mixed and ground uniformly to obtain a solid mixture. The solid mixture is heated to melt the sodium nitrate, forming an ion-molten liquid environment, and the reaction takes place in this environment. During the reaction, sodium bismuthate dihydrate and sodium sulfite undergo a redox reaction to generate the transition product bismuth oxysulfate, producing hydroxide ions and forming a self-generated alkaline environment. Simultaneously, in this self-generated alkaline environment, bismuth oxysulfate and copper sulfate react to generate bismuth cuprate. The reaction product is then post-treated to obtain Bi₂CuO₄ nanopowder. The advantages of this invention are: based on the synthesis strategy of using an ion-molten liquid environment, accelerating reactant diffusion, and improving redox reaction efficiency, it can efficiently prepare bismuth cuprate nanopowder, and the preparation steps are simple, convenient, and low-cost.

A method of partitioning minor actinides includes directing a minor actinide aqueous solution into an actinide partitioning unit, the minor actinide aqueous solution comprising americium and curium in an aqueous solvent and the americium and the curium are each in a first oxidation state, directing a selective extracting solution into the actinide partitioning unit, wherein the selective extracting solution comprises an organic neutral extractant, an phase modifier, a hydrocarbon diluent, and sodium bismuthate, contacting the minor actinide aqueous solution with the selective extracting solution such that the curium binds with the selective extracting solution to form an organic phase curium solution and the sodium bismuthate induces an oxidation state increase in the americium from the first oxidation state to a second oxidation state, wherein the americium in the second oxidation state remains bound with the minor actinide aqueous solution, thereby partitioning the americium and the curium, and collecting the americium.

This invention discloses a nano-heterojunction radiosensitizer suitable for hypoxic tumors and its preparation method. The radiosensitizer is a core-shell structured nanoparticle, comprising a core and a shell. The core is a high-valence bismuth-based nanomaterial, including at least one of sodium bismuthate, silver bismuthate, and potassium bismuthate. The shell coats the surface of the core and comprises a metal oxide. A Z-shaped heterojunction is formed between the inner core and the outer shell. Under X-ray excitation, this heterojunction forms a built-in electric field, promoting electron-hole separation. Electrons in the high-valence bismuth nanoparticle phase reduce high-valence bismuth (Bi). 5+ →Bi 3+ ) and releases highly reactive lattice oxygen, which then reacts with holes on the TiO2 phase to generate singlet oxygen ( 1 O2), while the holes on TiO2 oxidize water molecules to produce hydroxyl radicals (•OH).

A method of partitioning americium that includes directing an actinide-lanthanide containing raffinate into a liquid-liquid extraction system, wherein the actinide-lanthanide containing raffinate comprises americum, curium, and one or more lanthanides in an aqueous solvent, contacting the actinide-lanthanide containing raffinate with an organic extracting solution such that the americum, the curium, and the one or more lanthanides bind with the organic extracting solution to form an actinide-lanthanide organic solution, wherein the organic extracting solution comprises an organic neutral extractant, a phase modifier, and a hydrocarbon diluent, and contacting the actinide-lanthanide organic solution with sodium bismuthate in nitric acid such that the sodium bismuthate induces an oxidation state increase in the americum from a first oxidization state to a second oxidation state such that the americum unbinds from the actinide-lanthanide organic solution, thereby partitioning the americum from the curium and the one or more lanthanides.