7 results about "Bismuth phosphate" patented technology

The present application belongs to the technical field of non-ferrous metallurgy, and particularly relates to a method for cooperatively removing copper, arsenic, tellurium and lead in crude bismuth, which comprises the following steps: S1, obtaining molten bismuth liquid by melting, adding an oxidizing agent to the molten bismuth liquid, and performing a pre-oxidation reaction under stirring; S2, adding a composite removing agent and a fluxing agent to perform a reaction, and then removing surface dross; the composite removing agent comprises iron powder, bismuth phosphate and sodium sulfide; S3, adding the crude bismuth after step S2 to a vacuum rectification furnace, vacuum heat-insulating, and outputting refined bismuth. Through the cooperative design of pre-oxidation activation, in-situ sulfidation and phosphate slagging, the present application realizes the simultaneous and efficient removal of impurities such as Cu, As, Te and Pb, and the effective recovery of Ag. Subsequent vacuum distillation further removes residual lead in depth, and ensures that the refined bismuth product reaches a high standard.

The invention provides a BiPO4 / CdIn2S4 composite photocatalyst, a preparation method thereof and application of the BiPO4 / CdIn2S4 composite photocatalyst in photocatalytic degradation of methylene blue, and relates to the technical field of environmental catalytic materials.CdIn2S4 (indium cadmium sulfide) microspheres and rod-like BiPO4 (bismuth phosphate) are prepared through a hydrothermal method, and then a BiPO4 / CdIn2S4 heterojunction is constructed through a mechanical mixing method; wherein the optimal molar ratio of BiPO4 to CdIn2S4 is 1: 5 (marked as BC5). According to the composite photocatalyst disclosed by the invention, through the heterostructure design, the material contact area is obviously increased, the photo-induced electron migration path is shortened, the photo-induced electron-hole pair compounding is effectively inhibited, and the visible light absorption range is widened; under the optimal condition, the MB degradation rate within 180 min reaches 99.31%, the degradation rate is only reduced by 6.09% after five times of recycling, and the stability is excellent. The preparation process is simple and convenient, the cost is low, the methylene blue dye wastewater can be efficiently treated, and the industrial application prospect is wide.

The invention discloses a lead-free diode glass bulb and a preparation method thereof, belongs to the technical field of diode glass bulbs, and creatively introduces a modified bismuth phosphate complex to solve the key problems that a traditional lead-free glass bulb is prone to causing thermal damage, devitrification defects, insufficient dielectric strength, weak acid corrosion resistance and the like in the low-temperature sealing process. The components form an amorphous wetting layer at a high temperature, so that the sealing activation energy is remarkably reduced, and thermal damage is avoided while low-temperature sealing is realized; meanwhile, the dielectric density is enhanced by filling micropores with bismuth ions, and the dielectric strength and the insulation reliability are improved; the phosphorus component is combined with aluminum ions to form a passive film, so that the acid corrosion resistance is greatly enhanced; according to the present invention, the bottleneck in the prior art is broken through, the glass bulb is suitable for the severe environments such as miniaturized equipment, automotive electronics and industrial high-temperature systems, and the packaging safety, the durability and the reliability of the glass bulb are significantly improved.

The invention provides a catalyst as well as a preparation method and application thereof. The catalyst comprises a carrier, active components and silicon dioxide, wherein the active components and the silicon dioxide are dispersed on the carrier; the active components comprise a main catalyst and a cocatalyst; the carrier is a molecular sieve, the main catalyst is phosphate of metal palladium, and the cocatalyst is tin phosphate and / or bismuth phosphate. According to the technical scheme, the active components are loaded on the molecular sieve, so that the pore structure and reaction sites of the carrier can be effectively improved, and the problems of low activity and poor selectivity of the catalyst are solved. Wherein the cocatalyst is added, so that the interaction between the noble metal main catalyst and the carrier is enhanced, the overall activity and stability of the catalyst are improved, and the dosage of noble metal palladium is reduced; meanwhile, non-metallic element phosphorus is dispersed in a carrier framework, so that the pore structure of the catalyst is effectively improved, the selectivity of the catalyst is improved, the carbon deposition resistance of the catalyst can be improved, and the service life of the catalyst is prolonged.

A battery negative electrode material, and a preparation method therefor and a use thereof. The battery negative electrode material comprises an active material; the active material is a composite material containing bismuth phosphate, phosphorus, bismuth, and a conductive carbon material. By introducing bismuth phosphate into the active material, on the one hand, the battery negative electrode material can enhance the dispersion effect of the conductive carbon material, phosphorus and crystalline bismuth, effectively preventing the occurrence of agglomeration; and on the other hand, because the bismuth phosphate is an inactive ingredient, the presence of bismuth phosphate in the active material can effectively mitigate a large volume change during charging and discharging, facilitating the stability of an SEI film, thereby endowing electrode materials with better cycle stability.

The present invention discloses a titanium carbide / bismuth oxyiodide / bismuth phosphate-based photoelectrochemical sensor for dopamine detection and a preparation method thereof. The photoelectrochemical sensor is prepared by forming a titanium carbide / bismuth oxyiodide / bismuth phosphate (BT / BiPO4) composite material into a film on the surface of a glassy carbon electrode. The BT / BiPO4 composite material has good light response, and rapid electron transfer provides high sensitivity for dopamine detection. The photoelectrochemical sensor of the present invention is applied to dopamine detection, has high sensitivity, and has good linear response in the range of 0.01 to 10 mM.

The invention discloses a negative-electrode-free sodium metal battery negative electrode current collector coating and a preparation method thereof, relates to a sodium battery negative electrode and a preparation method thereof, and aims to solve the technical problems of high nucleation overpotential and poor stable circularity of an existing negative-electrode-free sodium battery. The negative current collector coating of the negative-electrode-free sodium metal battery is prepared from an active substance, a conductive carbon material and an adhesive, wherein the active substance is bismuth fluoride, ferric fluoride, tin fluoride, bismuth oxide, antimony oxide, bismuth phosphate, antimony phosphate, bismuth acetate, lead acetate or antimony acetate. The active substance, the conductive carbon material and the adhesive are prepared into slurry, and the slurry is coated on the fluid and then dried. The half cell assembled by using the negative electrode current collector and sodium realizes the average coulombic efficiency of more than 99.5%, and realizes stable circulation for 300 circles in a sodium battery without a negative electrode. The method can be used in the field of sodium batteries or sodium metal batteries.