13 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.

The application provides a BiO 2‑x Energy storage catalyst, preparation method and application thereof, the preparation method comprises the following steps: step 1, NaBiO3·2H2O powder is added to NaOH solution, stirring, and a sodium bismuthate alkali solution is obtained; wherein the molar ratio of NaBiO3·2H2O to NaOH is (0.045-0.18):(2-4); step 2, the sodium bismuthate alkali solution is added dropwise into water, stirring, and a reaction precursor solution is obtained; step 3, the reaction precursor solution is subjected to hydrothermal reaction at 160-180 DEG C, and the obtained reaction product is washed and dried to obtain BiO 2‑x Energy storage catalyst. The BiO 2‑x Catalyst prepared by the method has piezoelectric characteristics, and has good broad-spectrum cyclic degradation effect on antibiotics, organic matters and dyes under dark conditions.

The invention discloses a bismuth tetroxide-bismuth molybdate heterojunction composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: performing hydrothermal reaction on sodium bismuthate to obtain bismuth tetroxide; sodium molybdate and bismuth nitrate are subjected to a hydrothermal reaction in a solution added with a surfactant, and bismuth molybdate is obtained; the preparation method comprises the following steps: carrying out hydrothermal reaction on bismuth tetroxide and bismuth molybdate to obtain the bismuth tetroxide-bismuth molybdate heterojunction composite material. The bismuth tetroxide-bismuth molybdate heterojunction composite material prepared by the invention can effectively widen the visible light absorption range and improve the utilization rate of sunlight, has excellent photocatalytic performance and no secondary pollution, and has better application prospects. The bismuth tetroxide-bismuth molybdate heterojunction composite material prepared by the invention can be used for photodegradation of organic pollutants, heavy metals, formaldehyde, NOx gas and the like.

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.

Preparation method of a cathode material for a doped manganese-based sodium ion battery, comprising the following steps: S1: Dissolving one or both of antimony trioxide and bismuth trioxide with an acid and subsequently adding a divalent manganese salt to produce a mixed metal salt solution; S2: Adding the mixed metal salt solution to an excess alkaline oxidizing agent solution for the reaction, and after the reaction is complete, carrying out a solid-liquid separation to obtain a solid material, such that manganese ions are oxidized to manganese dioxide, and antimony is co-precipitated with the manganese dioxide to a form of sodium hexahydroxyantimonate, or bismuth is co-precipitated with the manganese dioxide to a form of sodium bismuthate, thereby ensuring the homogeneity of doped elements in the cathode material and achieving atomic-level mixing between the elements; and S3: Drying the solid material and subsequent mixing with a sodium source and sintering of a resulting mixture to obtain the cathode material for the doped manganese-based sodium ion battery; wherein, in step S2, the alkaline oxidizing agent solution is a sodium hydroxide solution in which one or more of sodium hypochlorite, sodium chlorate, and sodium permanganate are dissolved; wherein, in step S2, the mixed metal salt solution is added dropwise, the alkaline oxidizing agent solution always has a pH equal to or greater than 10.5, and one oxidizing agent in the alkaline oxidizing agent solution is always sufficient; and wherein, in step S2, the temperature of the reaction is controlled to between 2 °C and 10 °C.

This invention relates to the field of photocatalysis technology and provides a method for preparing a copper-cuprous oxide-copper bismuthate ternary complex. Sodium bismuthate dihydrate, copper sulfate, and sodium sulfite are added to a hydrothermal reactor containing distilled water to obtain a solid-liquid mixture. Under hydrothermal conditions, the solid-liquid mixture undergoes a synergistic reaction between sodium bismuthate and sodium sulfite solutions in a heterogeneous interface in-situ redox reaction and between copper sulfate and sodium sulfite solutions in a homogeneous redox reaction to generate the copper-cuprous oxide-copper bismuthate ternary complex. The advantages of this invention are: a one-pot method for preparing elemental copper-cuprous oxide-copper bismuthate ternary complex through a synergistic combination of heterogeneous interface in-situ redox reaction and homogeneous redox reaction; and the preparation steps are simple, convenient, and easily quantitatively controlled.

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.

The application relates to the field of photocatalysis, and provides a preparation method of a cuprous sulfide-copper sulfide-bismuth oxy carbonate ternary compound. Sodium bismuthate dihydrate, copper sulfate and thiourea are used as raw materials, and water is used as a solvent; the raw materials are prepared into a solid-liquid mixture; the solid-liquid mixture is reacted under hydrothermal conditions; through the synergistic effect of heterogeneous interface in-situ oxidation-reduction reaction, homogeneous oxidation-reduction reaction and precipitation reaction, the cuprous sulfide-copper sulfide-bismuth oxy carbonate ternary compound is prepared. The heterogeneous interface in-situ oxidation-reduction reaction of the difficult-to-dissolve sodium bismuthate dihydrate solid, the homogeneous oxidation-reduction reaction and the precipitation reaction of the copper sulfate solution occur simultaneously, the deposition of the cuprous sulfide and the copper sulfide on the surface of the bismuth oxy carbonate is completed, and the compounding of the cuprous sulfide, the copper sulfide and the bismuth oxy carbonate is realized; the whole preparation process is simple, the three components can effectively form an atomic or molecular heterostructure, and the combination effect is good.

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.