38 results about "Bismuth doping" patented technology

The invention discloses a zinc cadmium sulfur-bismuth doped halloysite composite photocatalyst and a preparation method thereof. In the zinc-cadmium-sulfur-bismuth-doped halloysite composite photocatalyst, the halloysite has a nanotube structure, and the zinc-cadmium-sulfur is dispersedly grown on the surface of the bismuth-doped halloysite. The invention adopts a one-step solvothermal method to prepare the modified bismuth-doped halloysite, which is ultrasonically compounded with zinc, cadmium and sulfur to form a composite photocatalyst. The zinc-cadmium-sulfur-bismuth-doped halloysite composite photocatalyst of the present invention has good dispersion and many active sites, is used for photocatalytic degradation of 10mg / L rhodamine B, exhibits excellent catalytic performance, and the degradation rate reaches More than 85%.

The invention provides a method for preparing bismuth-doped lanthanum tin gallate yellow phosphor for AlGaN chips, and a method for preparing bismuth-doped lanthanum tin gallate yellow phosphor for AlGaN chips. The compound is used as a raw material, after being ground and mixed, it is pre-fired in the air atmosphere, taken out, ground and mixed, and burned in the air atmosphere to obtain the yellow phosphor La 3 SnGa 5 o 14 : Bi 3+ , the present invention does not use rare earth as the luminescent center, and uses cheap bismuth as the activator; the present invention has ultra-broadband emission covering the interval of 330nm to 800nm ​​under the excitation of ultraviolet light, and the half maximum width is 300nm; in addition, the preparation process of the present invention is simple , does not use harsh preparation conditions, such as high temperature and high pressure, can be prepared under normal pressure, and is easy to scale production; and the excitation band is located in the ultraviolet region, avoiding the overlap with the excitation light, and there is no reabsorption problem.

The invention provides a bismuth-doped phosphorosilicate glass and a preparation method thereof. The bismuth-doped phosphorosilicate glass is characterized by comprising 40 mol% to 70 mol% of P2O5. Under the pumping of a near-infrared semiconductor laser, ultra-wideband near-infrared light with a full width at half maximum of greater than 250 nm is observed. The bismuth-doped phosphorosilicate glass is prepared by the following steps: firstly, weighing bismuth-doped silicate and phosphate glass raw materials, respectively; melting to prepare two kinds of glass, respectively; then, mixing and stirring the two kinds of molten glass in a molten state; finally, cooling and molding the mixed molten glass. The method can be adopted to prepare bismuth-doped phosphorosilicate glass with high P2O5 ratio and high transmittance; the glass has relatively high fluorescence full width at half maximum; the bismuth-doped phosphorosilicate glass prepared by a novel method is expected to be applied to fields of ultra-wideband near-infrared light fiber lasers, tunable near-infrared fiber lasers and the like.

The invention discloses a bismuth-doped barium chlorinated pentaborate crystal emitting near-infrared light and a preparation method thereof. The chemical formula of bismuth-doped barium chloropentaborate crystal is Ba2(1-x)B5O9Cl:2xBi, 0.0001≤x≤0.10. The invention also discloses methods for preparing bismuth-doped barium chlorinated pentaborate crystals by adopting a high-temperature solid phase method and a melt method respectively. The high-temperature solid-phase method is to grind and mix the compound raw materials containing barium, boron, chlorine and bismuth, pre-calcine, grind and mix, and then fire at high temperature, and react the fired materials in a reducing atmosphere at 800-1000oC; Compared with the existing rare earth doped materials, the Ba2B5O9Cl:Bi crystal prepared by the present invention has absorption covering the ultraviolet, visible and near-infrared spectral regions, has a broadband near-infrared emission of 800-1500nm, and has a fluorescence half-maximum width greater than 200nm. longer than 30 microseconds.

The invention discloses a multi-element-doped titanic acid nano short tube preparation method. According to the preparation method, the sol-gel method is utilized to prepare bismuth-doped titanium dioxide nano-particles; then, the hydrothermal method is adopted to prepare a boron-cobalt-bismuth-doped titanic acid nanotube; finally, the ultrasonic wave and microwave synergetic and composite effect is adopted to cut off the boron-cobalt-bismuth-doped titanic acid nanotube. According to the invention, the ultrasonic wave and microwave synergetic and composite effect is adopted to cut off the boron-cobalt-bismuth-doped titanic acid nanotube so as to obtain the boron-cobalt-bismuth-doped titanic acid nano short tube with uniform lengths, and the minimum length of the boron-cobalt-bismuth-doped titanic acid nano short tube can reach 20 nm.

The invention relates to a preparation method for a composite fluorescent glass cover, and belongs to the technical field of lamp illumination. According to the method provided by the invention, bismuth-doped Y2O3:Eu<3+> fluorescent powder is synthesized, and the situation that 6s<2> -> 6s6p of a bismuth ion belongs to electric dipole allowed transition to overcome the problem that transition absorption intensity in 4f configuration of a rare earth ion is lower; Bi<3+> has a sensitization effect on Eu<3+>, the Bi<3+> is used as a light-emitting sensitizer, near-ultraviolet absorption of a Bi<3+> charge transfer band is utilized to effectively transfer absorbed energy to an excited state energy level of the rare earth ion, so that the effective utilization capability of exciting light is improved, and the fluorescence light-emitting intensity of the Eu<3+> is enhanced; a fluorescent powder material is fully dispersed into a glass matrix to solve the problem of uniformity of coating of the fluorescent material; and a zinc tellurate / zinc aluminate glass substrate is used to replace epoxy resin or a silica gel to be used as a packaging material, so that the problems that white light isshifted and a halo effect appears because the epoxy resin or the silica gel is subjected to aging yellowing can be effectively solved.

The invention relates to a synthesis method for preparing a bismuth-doped lithium silicate positive electrode material by taking iron tailing as a raw material. The synthesis method comprises the steps of firstly, preparing a sodium silicate solution by taking the iron tailing as the raw material; secondly, adding ferrous nitrate into the sodium silicate solution to obtain a ferrous nitrate precipitant; thirdly, mixing lithium oxide and Fe2O3 with the precipitant; and finally, performing calcination and cooling to obtain a bismuth-doped lithium silicate sample. The lithium silicate system material is an important lithium battery positive electrode material, and the method has very important significance to integrated utilization of the iron tailing, environmental protection, and promotionon development of high and new technology.

The invention discloses a near-infrared luminescent bismuth doped strontium chloro-pentaborate crystal and a preparation method thereof. The general formula of the crystal is Sr2(1-x)B5O9Cl : 2xBi, 0.1% <= x <= 3.0%. respectively weighing strontium containing, boron containing, chlorine containing and bismuth containing compounds as raw materials; preforming pre-burning at 623-823 K for 3-6 hoursafter the raw materials are uniformly ground, performing cooling to room temperature, and performing grinding and well mixing; and performing calcining at 1,073-1,173 K for 4-6 hours, performing reaction for 15 min - 10 hours under a reducing atmosphere of 1,073-1,173 K on an obtained sample after performing cooling to the room temperature, and performing grinding to obtain the crystal after performing cooling to the room temperature. The near-infrared fluorescence full width at half maximum is greater than 200 nm and wider than the luminescence of rare earth ions, and has longer fluorescencelifetime, so that the crystal can be taken as a laser gain medium and applied to the fields of ultra-wideband wavelength tunable novel laser sources or ultrashort pulse lasers.

The invention discloses a preparation method of a bismuth-doped tin oxide / bismuth phosphate composite photocatalyst. 3 ) 3 ·5H 2 O is dissolved in dilute nitric acid solution to obtain a clear and transparent solution A. 2 SnO 3 ·4H 2 O is dissolved in deionized water to obtain solution B, and solution B is added dropwise to solution A under stirring to obtain solution C, and Na 2 HPO 4 ·12H 2 O is dissolved in deionized water to obtain solution D, and then solution D is added dropwise to solution C under stirring conditions, and deionized water is added to make the total volume of the mixed system 30 mL, and the solution is loaded into a 50 mL autoclave, The hydrothermal reaction was placed in a constant temperature oven at 180 °C for 24 hours. After the autoclave was cooled to room temperature, the reaction solution was centrifuged. After washing, it was placed in a constant temperature drying box at 60 °C and dried for 12 hours to obtain a bismuth-doped tin oxide / bismuth phosphate composite light. catalyst. The composite photocatalyst prepared by the invention has wide absorption spectrum range, stable performance, high efficiency, non-toxicity and low cost, and can be used for efficiently degrading difficult biodegradable organic pollutants.

The invention relates to a copper-selenium-based thermoelectric material with high structural stability and a preparation method thereof, belonging to the research field of thermoelectric materials. The chemical formula of the thermoelectric material is Li y Cu 1.85‑x Bi x Se, where x is [0.02, 0.05], and y is [0.01, 0.03]; the present invention obtains Cu with stable cubic phase structure only by changing copper (Cu) vacancies 1.85 Se-based thermoelectric materials. On this basis, by filling copper (Cu) vacancies with lithium (Li) and doping with bismuth (Bi) to adjust the thermoelectric parameters of the material, Li with greatly improved thermoelectric performance was obtained. y Cu 1.85‑ x Bi x Se thermoelectric material, compared with pure phase Cu 1.85 Se-based thermoelectric materials are improved by at least 3 times without changing the structural transition characteristics of the samples. The present invention has very important promotion significance for the inhibition of phase transition of the copper-based sulfide-based thermoelectric material in practical applications.

The invention discloses a preparation method of a bismuth-doped tin oxide photocatalyst capable of efficiently degrading dye and antibiotic wastewater. 0.5-6mmol Bi(NO 3 ) 3 ·5H 2 O was dissolved in 15mL dilute nitric acid solution to obtain a transparent and clear solution A, and then 3mmol Na 2 SnO 3 4H 2 O was dissolved in 5mL deionized water to obtain solution B, then solution B was added to solution A under stirring conditions, deionized water was added to make the total volume of the mixed system 30mL, and the mixed system was transferred to 50mL polystyrene after stirring for 30min. In a vinyl fluoride reaction kettle, put it in a constant temperature oven at 180°C to react for 24 hours. After the reaction is completed, it is naturally cooled to room temperature, centrifuged, washed with deionized water and ethanol in turn, and then dried in a constant temperature oven at 60°C for 12 hours to obtain bismuth doped Hybrid tin oxide photocatalyst. The bismuth-doped tin oxide photocatalyst prepared by the invention has wide absorption spectrum range, stable performance, high efficiency, non-toxicity and low cost, and can be used for efficient degradation of refractory organic pollutants.

The invention relates to the technical field of nanomaterials, in particular to a method for preparing a bismuth-doped bimetallic sulfide electrode for electrocatalytic oxidation of urea, comprising the following steps: (1) combining a cobalt source, a nickel source, a bismuth source and an organic compound with a The body is dissolved in deionized water to obtain a mixed solution, added to a conductive substrate, and subjected to a hydrothermal reaction to take out the conductive substrate, washed and dried; (2) Sulfide treatment in a nitrogen atmosphere to obtain bismuth-doped bimetallic sulfide urea oxidation Electrocatalyst. The invention has low cost of raw materials, simple synthesis process, easy to achieve reaction conditions, and the prepared self-supporting high-efficiency urea oxidation electrocatalytic material heterojunction nano-sheet array has uniform size, stable structure and uniform component distribution, and gives the material better performance. Electrocatalytic performance and stability; the urea oxidation electrocatalyst of the present invention is grown on a conductive substrate in situ, making it a flexible and self-supporting material, which can be directly used as a catalyst without coating on an electrode.

The invention discloses a synthesis process method of bismuth-doped potassium niobate, comprising the following steps: analyzing pure Nb 2 o 5 Add analytically pure KOH to 25ml of deionized water, stir until evenly mixed, then transfer to a hydrothermal kettle, tighten the lid of the kettle, and place it in an oven to react for a certain period of time; after the reaction, take out the reaction kettle and let it cool naturally to room temperature, open the lid of the kettle, take out the product and filter, wash with deionized water and absolute ethanol several times, and obtain potassium niobate after drying under normal pressure at 60°C; take Nb 2 o 5 0.2g, KOH0.36g, Bi(NO 3 )·5H 2 O, according to the molar ratio of Bi / Nb is 0.25%, 0.5%, 0.75%, 1%, and 5% added in different proportions, at 240 ° C, hydrothermal reaction for 24 hours, the obtained samples of potassium niobate doped with Bi are all Appears as white powder. The invention develops a doped modified niobate nano-catalyst with catalytic activity under sunlight through the modification treatment of metal bismuth functional components doped with potassium niobate.

The invention belongs to the field of electrochemical coating layers, and particularly relates to a photocatalysis type nanometer bismuth vanadate-zinc electroplating layer with antibacterial and corrosion-resistant properties and a preparation method and application thereof. In a non-toxic sulfate plating liquid system containing nanometer bismuth vanadate, the constant-current electrodepositionis performed at the surface of the substrate by the ultrasonic waves and the stirring-assisting method, so as to obtain the nanometer bismuth vanadate-doped antibacterial and corrosion-resistant zincplating layer. The nanometer bismuth vanadate-zinc composite electroplating layer has the advantages that the surface is dense, the potential is negative, the environment-friendly effect is good, theantibacterial property is efficient, and the like; the nanometer bismuth vanadate-zinc electroplating layer is suitable for the green protection on steel and iron materials in the multiple biologicalactive environments, and the application value is good.