474results about "Bismuth compounds" patented technology

The invention provides anti-ionizing radiation powder with a core-shell heterogeneous gradient structure and a preparation method and application of the anti-ionizing radiation powder, and belongs to the field of radiation protection.The preparation method of the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure comprises the following steps that high-atomic-number metal salt is added into deionized water, aging, washing, drying and primary calcination are conducted in sequence, and the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure is obtained; a core layer is obtained; the core layer and low-atomic-number metal salt are added into deionized water, aging, washing, drying and primary calcination are sequentially conducted, and preliminary wrapping powder with the high-atomic-number metal core layer wrapped by low-atomic-number metal is obtained; and adding the preliminarily wrapped powder and rare earth salt into deionized water, and sequentially performing aging, washing, drying, primary calcining, secondary calcining, airflow crushing and air rotation purging to obtain the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure. Through cooperation of the core-shell heterostructure, the high-atomic-number oxide, the low-atomic-number oxide and the multi-element rare earth element, the shielding performance of the material is remarkably improved.

The invention provides a bismuth oxybromide-based photocatalytic material, and a preparation method and application thereof, and the preparation method comprises the following steps: (1) dissolving bismuth nitrate pentahydrate and polyvinylpyrrolidone in an alcoholic solution, rapidly stirring to obtain a mixed solution, adding potassium bromide into the mixed solution, and continuing to fully stir for reaction; and (2) transferring the mixed solution into a reaction kettle with a polytetrafluoroethylene lining, carrying out solvothermal reaction, carrying out centrifugal suction filtration separation on the obtained product, washing and drying to obtain the photocatalytic material. The bismuth oxybromide-based photocatalytic material, the preparation method and the application have the advantages that the bismuth oxybromide-based photocatalytic material is excellent in performance and high in visible light response capability, dyes can be quickly degraded in a short time, and the treatment efficiency of printing and dyeing wastewater can be obviously improved.

The invention discloses nanoscale bismuth hydroxide as well as a preparation method and application thereof. The invention provides a preparation method of bismuth hydroxide. The preparation method comprises the following steps: reacting a mixture solution of a surfactant solution and a bismuth source solution at the temperature of 100-300 DEG C and the pressure of 0.5-5 MPa to obtain bismuth hydroxide, the pH value of the mixture liquid is 5-12; the bismuth source is bismuth nitrate; the surfactant is selected from polyvinylpyrrolidone or hexadecyl trimethyl ammonium bromide. According to the preparation method, bismuth hydroxide with the microscopic primary particle size of about 40-90 nm, uniform distribution, the secondary particle size D99 of 2-4 microns, the purity of 99.9% and the particle size of more than 99.9% can be obtained, and the adsorption rate of bismuth hydroxide to bromide ions and iodide ions reaches 80% or more.

The invention belongs to the technical field of all-vanadium redox flow battery electrodes, and discloses a graphite felt electrode for a vanadium battery and a preparation method and application of the graphite felt electrode. Preparing a spinel composite graphite felt; preparing a spinel inlaid perovskite composite graphite felt electrode; preparing a composite graphite felt electrode; the nano petal-shaped spinel composite perovskite nanospheres are synthesized by adopting an electro-deposition and sol-gel method, the structure is stable, the effective active area is increased, the oxidation reduction capacity of vanadium is catalyzed, the reaction energy barrier is reduced, the precipitation amount of oxygen and hydrogen in an electrolyte is effectively reduced, the oxygen evolution / hydrogen evolution side reaction is inhibited, the utilization rate of the electrolyte is improved, and the service life of the electrolyte is prolonged. And the energy loss generated by side reaction during battery operation is reduced.

Disclosed is a method of fabricating a self-standing Graphene Oxide (GO) membrane comprising a plurality of layers of crosslinked GO sheets, the method comprising using a crosslinking agent to crosslink between oxygen-containing functional groups of neighbour GO sheets, wherein the crosslinking agent is a metallic oxide or a carbide.

The invention belongs to the technical field of solid electrolytes, and relates to a selenium-doped sulfide solid electrolyte as well as a preparation method and application thereof. The general chemical formula of the sulfide solid electrolyte is Li < 6 + / -iP < 1-x > MxS < 5-y > SeyX, i is greater than or equal to 0 and less than 1, x is greater than 0 and less than 1, y is greater than 0 and less than 1, M is one or more of Zr, Ta, Nb, Mo, Bi, In and Y, and X is one or more of Cl, Br and F. According to the invention, the selenium element with larger ionic radius and lower electronegativity is introduced to replace the sulfur element, and Zr, Ta, Nb, Mo, Bi, In or Y elements are introduced, so that the doped sulfide solid electrolyte system has excellent stability to air, organic solvents and lithium while ensuring high ionic conductivity, and the assembled all-solid-state battery shows excellent cycle stability.

A method of producing bismuth oxyhalide quantum dots without heat. The method is a one-pot method that includes synthesizing bismuth oxyhalide quantum dots at room temperature. The method results in quantum dots preferably having bismuth and halide in a molar ratio of 1:1. Further, the bismuth oxyhalide quantum dots produced demonstrate excellent photocatalytic activity in the visible light spectrum and possess improved surface characteristics.

The invention provides a positive electrode material and a preparation method thereof, a positive plate, a battery and electric equipment. The positive electrode material comprises a ternary material core and Bi (2-x) MxO (3-delta) particles coating the surface of the ternary material core, delta is more than or equal to 0.01 and less than or equal to 1.5, x is more than or equal to 0 and less than or equal to 1, and M is selected from one or more of Sr < 2 + >, Ba < 2 + >, Ca < 2 + >, Er < 3 + >, Ln < 3 + > and Sm < 3 + >; the chemical formula of the ternary material core is Li (NiaCobMn1-a-b) O2, a is more than or equal to 0.8 and less than 1, and b is more than 0 and less than or equal to 0.2. According to the positive electrode material disclosed by the invention, the surface of the high-nickel ternary material core is coated with the Bi (2-x) MxO (3-delta) particles with rich oxygen vacancies, so that lattice oxygen on the surface of the high-nickel ternary material core can be stabilized, and the positive electrode material has high capacity and structural stability.

The invention discloses a wide-spectrum electromagnetic wave modulation method based on silver-based chalcogenide, and belongs to the technical field of electromagnetic wave modulation. According to the invention, the abrupt-change modulation of 1GHz-300THz wide-spectrum electromagnetic waves is realized based on the electronic phase change characteristic of the metal insulator under the triggering of the silver-based chalcogenide under the characteristic external field, and the resonant structure design is combined, so that the functions and applications of electromagnetic wave switching, electromagnetic wave intelligent shielding, dynamic information communication encryption, multi-spectrum camouflage and passive electromagnetic wave protection are realized. The main conception is that a silver-based chalcogenide material with an electronic phase change characteristic is introduced as a sensitive medium, and mutation of electromagnetic wave optical characteristics covering microwave, terahertz and infrared frequency bands caused by electronic phase change of the silver-based chalcogenide is triggered by utilizing characteristic temperature, characteristic pressure and characteristic current. According to the invention, the technical barrier of wide spectrum response and multi-mode dynamic modulation is broken through, and the modulation effect can be cooperatively regulated and controlled by the components of the silver-based chalcogenide material and the structure of the resonant array.

The invention relates to the field of photoelectric sensors, in particular to a photoelectric sensor based on a bismuth sulfide composite material and application of the photoelectric sensor in norfloxacin detection, and a preparation method of the photoelectric sensor comprises the following steps: preparing the bismuth composite material; modifying the bismuth composite material with gold nanoparticles; modifying a fluorine-doped tin oxide glass electrode; the photoelectric sensor provided by the invention is combined with the gold nanoparticle sol, and an electric field formed by surface plasmon resonance accelerates the migration of electrons, enhances the optical absorption of the whole material and improves the photoelectric response. The photoelectric signal intensity has a good linear relationship with the concentration of norfloxacin in a certain range, so that the method has good reproducibility and relatively high detection sensitivity, can realize effective detection of norfloxacin, and has good application value and application prospect in the fields of environment, biology, medicine and the like.

The invention relates to the field of inorganic material preparation, and provides a bismuth hydroxide material and a preparation method thereof. The bismuth hydroxide is sphere-like nano-particles with the particle size of 85-175 nm, the dispersity is good, and the purity exceeds 99.8%. The preparation method comprises the following steps: preparing a micelle solution from a polyethylene glycol-polylactic acid (PEG-PLA) block copolymer, adding bismuth salt into the micelle solution, carrying out a reaction, and carrying out centrifugation, washing and vacuum drying to obtain the product. Due to the unique amphipathy of the PEG-PLA micelle, bismuth ions are uniformly distributed, and the uniformity of particles is improved; the hydrophilic chain segment forms steric hindrance to inhibit particle aggregation; meanwhile, the reaction rate is slowed down, and high-concentration ammonia water is combined to ensure high purity of the product. The method overcomes the problems of uneven particle size and agglomeration in traditional preparation.

A compound containing lithium, a tetravalent metal element M, chlorine and a dopant element X and having a reflection peak in each of 2θ angle ranges of 15° to 17°, 31° to 32.5°, 41° to 42.5°, 48.5° to 50° and 53° to 55° in an X-ray diffraction chart measured using a CuKα ray at 25° C., in which a half width of a reflection peak having a largest peak height in the 15° to 17° range is 0.35° to 3.00°.

The present application relates to a kind of preparation method of bismuth trifluoride, belong to bismuth compound preparation technical field.The preparation method of bismuth trifluoride of the present application includes the following steps: bismuth-containing compound powder is hydrothermally reacted with hydrofluoric acid;The bismuth-containing compound is one or any combination of bismuth oxide, bismuth oxychloride, bismuth trichloride.The preparation method of bismuth trifluoride of the present application carries out hydrothermal reaction to bismuth oxide, bismuth oxychloride, bismuth trichloride and hydrofluoric acid, and the high temperature and high pressure generated by hydrothermal reaction are used to improve the reactivity, solve the problem that bismuth oxide, bismuth oxychloride and bismuth trichloride are not completely reacted with hydrofluoric acid under normal pressure, resulting in low yield and low purity, product can be obtained by one-step reaction.The preparation method of bismuth trifluoride of the present application is simple, and route is short, the solvent used is water, cost is low, yield is high, and it is economic and environmental protection.

The invention discloses a preparation method of stable in-situ 14: 24 AEC second-phase Bi-2212 powder, which comprises the following steps: preparing powder with specific components by controlling the components of a Bi-2212 precursor solution, and then adjusting by a fine heat treatment process to obtain the stable in-situ 14: 24 AEC second-phase Bi-2212 powder. According to the method disclosed by the invention, components of a Bi-2212 precursor solution are controlled, the components of Bi-2212 precursor powder after heat treatment and the molar ratio of Sr to Ca are monitored to be within a specific range, and a heat treatment process is matched for adjustment, so that stable generation of a 14: 24 AEC second phase in the Bi-2212 precursor powder is ensured; the self-generated 14: 24 AEC second phase can improve the critical current density of the Bi-2212 superconducting material; the method is easy to operate, low in cost, high in controllability and operability and suitable for being rapidly applied to the field of Bi-2212 superconducting material preparation.

A method of producing bismuth oxyhalide quantum dots without heat. The method is a one-pot method that includes synthesizing bismuth oxyhalide quantum dots at room temperature. The method results in quantum dots preferably having bismuth and halide in a molar ratio of 1:1. Further, the bismuth oxyhalide quantum dots produced demonstrate excellent photocatalytic activity in the visible light spectrum and possess improved surface characteristics.

Methods of flash-within-flash (FWF) Joule heating and the systems thereof. The FWF Joule heating process subjects outer feedstock in an outer vessel to a flash Joule heating process, whereby the flash Joule heating process upon the outer feedstock results in the conversion of inner feedstock within an inner vessel (which inner vessel is within the outer vessel) to a converted material.

The invention discloses a double perovskite material and a preparation method and application thereof, the chemical formula of the double perovskite material is Cs2AErZBi1-ZX6, A is one of Ag, Na and K, X is one or two of halogen anions, and Z is more than 0 and less than 1. According to the double-perovskite material provided by the invention, monovalent A (one of Ag, Na and K) ions and trivalent Er and Bi ions are used for replacing divalent Pb ions in a conventional double-perovskite material, so that the toxicity of the double-perovskite material is greatly reduced, and regulation and control of a perovskite band gap are realized to obtain the optical characteristic of a near-infrared II region. The rare earth element Er regulates and controls the energy level of the transition metal element Bi, so that the double perovskite material can realize a luminescence peak with the luminescence center of 1542nm. A detector prepared from the double perovskite material provided by the invention can realize visible-near infrared band (447-1550 nm) detection, I light / I dark in a visible light region can reach 104, and particularly, I light / I dark in 1550 nm and 1310 nm is greater than 102.

The invention provides a Bi-doped SnO catalyst and a preparation method and application thereof, a gas diffusion electrode and a preparation method and application thereof, and belongs to the technical field of catalyst preparation. The preparation method comprises the following steps: mixing divalent metal tin salt, a regulator and bismuth salt in water to obtain a mixed solution; and mixing the mixed solution with a sodium hydroxide solution, and reacting to obtain the Bi-doped SnO catalyst. The preparation method is simple, rapid, low in cost, green and free of organic solvent or high-temperature treatment, and the prepared catalyst is stable in structure and lasting in performance. The Faraday efficiency of a gas diffusion electrode prepared by adopting the Bi-doped SnO catalyst for synthesizing formic acid through electrocatalytic reduction of CO2 at-850 mA / cm < 2 > is as high as 98%, the gas diffusion electrode can stably run for more than 140 h under N2 purging in a solid electrolytic tank, and the concentration of formic acid continuously produced exceeds 5 mol / L.

The invention provides a preparation method of an alpha-Fe2O3 (at) Bi2O3 core-shell ellipsoid, and relates to a preparation method of a core-shell ellipsoid material, according to the method, fusiform alpha-Fe2O3 is taken as a core, Bi (NO3) 3.5 H2O is taken as a bismuth source, and polyvinylpyrrolidone (PVP) is utilized to assist a solvothermal method to successfully synthesize the alpha-Fe2O3 (at) Bi2O3 core-shell ellipsoid. By adjusting the addition amount of PVP, alpha-Fe2O3 and Bi2O3 core-shell ellipsoids with different shell thicknesses can be synthesized. The method is simple to operate and low in cost, and the prepared alpha-Fe2O3-Bi2O3 core-shell ellipsoid is stable in structure, good in dispersion, uniform in particle size and adjustable in morphology and size, and has important application prospects in the fields of photocatalysis, sensors, electrochemistry and the like.

The invention provides an ammonia gas sensor, a preparation method thereof and an ammonia gas detection device. The ammonia gas sensor comprises a substrate, an interdigital electrode and a gas sensitive layer, the interdigital electrode is arranged on at least one side of the substrate, and the gas sensitive layer is arranged on the surface of one side, far away from the substrate, of the interdigital electrode; the gas sensitive layer is prepared from a polyaniline-bismuth oxychloride composite material. The polyaniline-bismuth oxychloride composite material is used as a gas sensitive layer material of the ammonia gas sensor, so that the prepared ammonia gas sensor has the characteristics of strong response, fast recovery, high sensitivity and the like. Specifically, the strong covalent bond and weak Van der Waals force of bismuth oxychloride can enhance the adsorption effect and retention time of bismuth oxychloride on ammonia molecules, polyaniline has specific adsorption on ammonia, and the cooperation of bismuth oxychloride and polyaniline can enhance the response of the sensor to ammonia.

The invention discloses a preparation method of nuclear radiation protective clothing, and belongs to the technical field of nuclear radiation protection. The raw materials comprise, by weight, 80-100 parts of polyester chips, 15-29 parts of modified nanometer bismuth oxide, and 12-18 parts of tungsten boride. According to the prepared protective clothing, polyester serves as a base material, the comfort level is high, wrinkles are not prone to occurring, by adding tungsten boride and modified nanometer bismuth oxide, the protective clothing is endowed with excellent shielding performance, flame retardance and aging resistance, and the protective clothing is free of lead and toxicity and environmentally friendly; the weaving technology and the coating compounding technology are combined, the coating contains polypyrrole, the shielding performance of the protective clothing can be further improved, and in conclusion, the protective clothing has important application value in the technical field of nuclear radiation protection.

The invention discloses a heterogeneous precipitation preparation process of modified tin oxide powder doped with middle-low-melting-point oxides, and relates to the field of powder metallurgy. The preparation method comprises the following steps: coating bismuth oxide on the surface of tin oxide slurry which is prepared by a traditional acidification method and has the D50 particle size of 0.5-3 microns by utilizing a heterogeneous precipitation method, then calcining at 900-1200 DEG C, carrying out liquid-phase sintering on the tin oxide by utilizing the state of a bismuth oxide liquid phase at the temperature, and then cooling, thereby obtaining the bismuth oxide-tin oxide composite material with the D50 particle size of 0.5-3 microns. The modified tin oxide powder doped with the medium-low-melting-point oxides is spheroidic in morphology and concentrated and uniform in particle size distribution. Compared with tin oxide powder prepared through a traditional acidification tin oxide preparation process, the low-medium-melting-point oxide modified tin oxide powder prepared through the process has the advantages of being more concentrated in particle size distribution, better in particle size uniformity and easier to disperse evenly, and a silver tin oxide material good in uniformity and stable in quality can be prepared easily.

The invention relates to the technical field of biomass catalytic conversion, in particular to a photocatalyst for preparing 2, 5-furandicarboxaldehyde and a preparation method and application thereof.The preparation method comprises the steps that Bi (NO3) 3.5 H2O and KBr are weighed and dissolved in ultrapure water under the assistance of ultrasonic waves, and the solutions are marked as a solution A and a solution B respectively; then, under the condition of continuous stirring, dropwise adding the solution B into the solution A, further stirring for 2 hours, centrifuging to obtain sample powder, washing the sample powder with deionized water and ethanol for 3 times respectively, and finally drying the sample powder in a vacuum oven at 60 DEG C for 12 hours to obtain the oxygen vacancy-free photocatalyst BiOBr-(001) of which the exposed crystal face is a (001) face. The catalyst provided by the invention has high photon-generated carrier transmission and separation efficiency and strong oxygen adsorption capacity, is beneficial to generation of. O2 <->, and is simple in preparation method and low in cost; under the illumination condition of 400 nm, air is used as an oxygen source at normal temperature and normal pressure, acetonitrile is used as a solvent, efficient catalytic conversion preparation of DFF by using HMF as a substrate can be realized, and the method has good recoverability.

The invention discloses a preparation method and a preparation system of nano metal oxide powder. The preparation method comprises the following steps: adding a batch of metal blocks into a smelting furnace to form metal liquid after smelting, the metal liquid enters a plasma furnace through a connecting pipe, and when the metal liquid levels in the smelting furnace and the plasma furnace reach a set height; turning on a plasma gun arranged on the top of a plasma cover, the plasma gun gasifies the metal liquid in the plasma furnace into gaseous metal, air enters the plasma cover during the gasification process, the gaseous metal and the air undergo oxidation reaction to obtain metal oxide, the metal oxide enters a powder collector driven by the air and is quickly cooled to obtain nano metal oxide; while turning on the plasma gun, metal blocks are added into the smelting furnace through a feeder, and the adding speed of the metal blocks is controlled by the feeder to maintain the metal liquid level change in the smelting furnace and the plasma furnace within ±5 mm.

The invention discloses a bismuth oxide-based fuel cell electrolyte material and a preparation method thereof, and relates to the technical field of cell electrolyte materials. The material is composed of a trication-doped delta-Bi2O3 core and a zirconium oxide coating layer, the trication-doped delta-Bi2O3 core is co-doped with erbium, tungsten and aluminum ions, and the material comprises the following components in parts by mass: 75-80 parts of bismuth oxide (Bi2O3); 14 to 19 parts of erbium oxide (Er2O3); 1 to 3 parts of tungsten oxide (WO3); 1 to 3 parts of aluminum oxide (Al2O3); the zirconium oxide coating layer is formed by a coprecipitation method, and the thickness of the zirconium oxide coating layer is 5-20nm, so that the technical problems that the working temperature range of delta-Bi2O3 is difficult to broaden, and the low-temperature phase change and reduction under low oxygen partial pressure are difficult to inhibit are solved.

Described are luminescent components with excellent performance and stability. The luminescent components comprise a first element 1 including first luminescent crystals 11 from the class of perovskite crystals, embedded a first polymer P1 and a second element 2 comprising a second solid polymer composition, said second polymer composition optionally comprising second luminescent crystals 12 embedded in a second polymer P2. Polymers P1 and P2 differ and are further specified in the claims. Also described are methods for manufacturing such components and devices comprising such components.

The invention provides a process for the preparation of a bismuth sodium titanate (BNT) compound of formula (I) wherein A is one or more of Bi, Na, Li, K, Mg, Ca, Sr, Ba, La, Al, Cu, Eu, Ag and Zn; B is one or more of Ti, Nb, Ta, Zr, Fe, Nd, Eu and Co; 0 < x < 0.8; 0 <y < 0.8; and -0.1 < z < 0.1; said process comprising spray pyrolysis of a solution comprising Bi ions, Na ions, Ti ions and, if present, metal (A) and / or metal (B) ions.

Preparation method and application of bismuth sulfide / zinc oxide heterojunction material, which solves the problem that the gas sensor prepared from Bi2S3-based heterostructure can only detect H2S gas under dark conditions, while there are still problems of low response value and poor selectivity under visible light conditions. Method: Synthesize Bi2S3 nanowires, and mechanically mix them with ZnO nanoparticles to form a Bi2S3 / ZnO heterostructure. Regulate the quantity of zinc oxide, change the electronic structure of bismuth sulfide, improve the surface adsorption active sites, and then improve the response value and selectivity for detecting H2S under room temperature visible light, and shorten the response time. After the surface of Bi2S3 nanowires is modified with ZnO in the present invention, it has a response value of 16.0 times for 500 ppb of H2S under room temperature visible light, the response time is only 51.6 s, and it has good selectivity, low cost and simple process, and is suitable for industrial production. It is used for rapid detection of H2S under room temperature and visible light conditions.

The invention relates to a preparation method and application of an ultra-efficient nitrate-based free radical activation catalyst, and the preparation method comprises the following steps: S1, dissolving bismuth nitrate Bi (NO3) 3.5 H2O and polyvinylpyrrolidone (PVP) in a mannitol solution; s2, adding potassium bromide into the solution in the step S1, and performing ultrasonic treatment to form a white suspension; s3, transferring the suspension into a high-pressure reaction kettle for hydrothermal reaction; and S4, after the reaction is completed, cooling, centrifugally collecting precipitates, washing, and carrying out vacuum freeze drying to obtain the bismuth oxybromide BixOBr nanosheet catalyst. According to the application of the super-efficient nitrate-based free radical activation catalyst in degradation of organic pollutants, the bismuth oxybromide BixOBr nanosheet catalyst is added into a water body containing nitrate, the nitrate is activated to generate free radicals by utilizing the piezoelectric effect induced by photoinduced deformation of the photocatalyst under the condition that an external electric field and an oxidizing agent are not needed, and the degradation efficiency of the nitrate-based free radical activation catalyst is improved. Therefore, organic pollutants are degraded.

Aspects of the present disclosure are directed towards a method for producing an activated carbon / bismuth oxy-iodide nanocomposite. The method includes heating a glycol solution including Bi(NO3)3·5H2O and activated carbon to 100° C. The method includes heating a glycol solution includes potassium iodide to 100° C. The method includes adding the glycol solution including Bi(NO3)3·5H2O and activated carbon and the glycol solution including potassium iodide to a reaction vessel including a solvent to form a reaction mixture. The method includes chilling the reaction mixture to ambient temperature. The method includes filtering the reaction mixture to obtain the activated carbon / bismuth oxy-iodide nanocomposite.