13 results about "Vanadium pentoxide dust" patented technology

The invention provides a graphite phase carbon nitride composite catalyst with light-dark continuous catalytic performance and a preparation method and application thereof, and belongs to the technical field of chemical catalysts. The raw materials of the catalyst comprise graphite phase carbon nitride, vanadium pentoxide and an MXene material, the vanadium pentoxide accounts for 2-10% of the mass of the graphite phase carbon nitride, the MXene material accounts for 3-7% of the mass of the graphite phase carbon nitride, the graphite phase carbon nitride powder and the vanadium pentoxide powder are mixed, ground and calcined, then are uniformly mixed with the MXene material, and are calcined again to obtain the catalyst. The graphite phase carbon nitride composite catalyst with light-dark continuous catalytic performance is obtained. By utilizing the synergistic effect of the three raw materials, the constructed composite catalyst is used for oxidative degradation of antibiotics (tetracycline hydrochloride) in a water body, and has an efficient light-dark continuous catalytic oxidation effect.

This invention relates to a method for in-situ synthesis of visible light photocatalytic geopolymers from vanadium-containing solid waste. The technical solution is as follows: vanadium-containing solid waste is ground into powder, and the resulting vanadium-containing solid waste powder is mixed with vanadium pentoxide powder. The resulting vanadium-containing geopolymer precursor is mixed with an alkaline activator and stirred evenly to obtain a vanadium-containing geopolymer slurry. The vanadium-containing geopolymer slurry is placed in a mold, cured, demolded, cured a second time, and crushed to obtain a crushed vanadium-containing geopolymer. The crushed vanadium-containing geopolymer is mixed with deionized water to obtain a vanadium-containing geopolymer aqueous solution. Bismuth nitrate solution is added to the vanadium-containing geopolymer aqueous solution, mixed evenly, and the pH value is adjusted. A hydrothermal reaction is then carried out. Solid-liquid separation, washing, and drying are performed to obtain the visible light photocatalytic geopolymer. This invention can efficiently utilize low-vanadium content and completely eliminate vanadium. The in-situ synthesis of visible light photocatalytic geopolymers from vanadium-containing solid waste not only effectively decomposes organic pollutants under visible light conditions but also effectively fixes vanadium in the vanadium-containing solid waste.

The invention relates to a preparation method of high-purity vanadium trioxide. The preparation method comprises the following steps: (1) preparing a glucose-montmorillonite hydrothermal carbon composite material; (2) mixing vanadium pentoxide powder, graphene and the glucose-montmorillonite hydrothermal carbon composite material obtained in the step (1), stirring and reacting for 1-3 hours at 600-800 DEG C, adding water after the reaction, stirring and dissolving, and then filtering to remove insoluble substances to obtain a precursor solution; (3) adding ammonia water into the precursor solution obtained in the step (2), and reacting while stirring to generate a precipitate; the reaction is finished at the moment, and the pH value of the solution is 8-10; filtering and taking a precipitate; (4) drying the precipitate obtained in the step (3) to obtain a precursor; the precursor is placed in an inert atmosphere to be calcined, the calcination temperature is 500-600 DEG C, and the time is 1-3 h; the high-purity vanadium trioxide is obtained. The purity of the obtained vanadium trioxide is greater than or equal to 99.99%. The particle size is 20-80 nm.

To obtain a vanadium sulfuric acid solution from vanadium pentoxide powder with high efficiency, without using a calcination furnace or reducing agent. [Solution] A cell stack comprising a plurality of unit cells, each comprising a positive electrode cell, an ion exchange membrane, a negative electrode cell, and a bipolar plate in order from the first end, wherein the bipolar plate comprises, in order from the first end, a negative electrode electrode which is a graphite molded plate containing 70% by mass or more of graphite and a positive electrode which is formed by coating a titanium plate with a platinum group metal oxide, and carbon felt is arranged in the negative electrode cell; a positive electrode tank connected to each of the positive electrode cells so as to be able to circulate fluid; a negative electrode tank connected to each of the negative electrode cells so as to be able to circulate fluid; and a reaction tank for reacting vanadium pentoxide powder with a vanadium sulfuric acid solution, is provided as an apparatus for producing a vanadium sulfuric acid solution for a vanadium redox flow battery.

The invention belongs to the technical field of laser Raman spectrum detection, and relates to a multicolor electrochromic SERS (Surface Enhanced Raman Scattering) substrate as well as a preparation method and application thereof, the method comprises the following steps: synthesizing a vanadium pentoxide nanobelt by using vanadium pentoxide powder as a raw material through a simple solvent treatment method, and preparing the multicolor vanadium oxide electrochromic SERS film substrate by adopting a spraying processing technology. The multicolor vanadium oxide electrochromism SERS substrate has electrochromism and SERS effects, the change of charge transfer, charge density and band gap width is accompanied in the electrochromism process, and the SERS performance of the multicolor vanadium oxide electrochromism SERS substrate can be remarkably changed through the change. The color, the transmittance, the energy band gap and the detection performance can be accurately, reversibly and visually regulated and controlled by naked eyes by changing the external potential. The color of the multicolor electrochromic SERS substrate and the SERS detection performance have strong relevance, the SERS detection performance and molecular selectivity of the multicolor electrochromic SERS substrate can be judged through color change, and the multicolor electrochromic SERS substrate has great significance in trace detection of to-be-detected molecules.

The utility model relates to the technical field of vanadium pentoxide crushing, and discloses a vanadium pentoxide powder crushing device which comprises a crushing box, a fixing plate fixedly mounted on the outer wall of the crushing box, two electric telescopic rods fixedly mounted in the fixing plate, a sleeve fixedly mounted in the crushing box, and a spring fixedly mounted on the outer wall of a transverse plate. A guide rod is slidably connected into the transverse plate, and a pressing plate is fixedly mounted at the bottom end of the guide rod. According to the vanadium pentoxide powder smashing device, the effect of smashing the vanadium pentoxide is achieved by putting the vanadium pentoxide into the material conveying pipe, starting a first motor to drive a grinding disc to rotate and matching a grinding disc with the grinding disc, and starting a second motor to drive a driving shaft to rotate and drive a turnover plate to rotate; and the overturning plate rotates the ground alum powder, so that the dust is prevented from falling into the crushing box to block and block the crushing box, the fine grinding effect can be realized, and the problems that the existing crushing mode is complicated in process and the efficiency is easily influenced are solved.

The invention discloses a method for synthesizing vanadium electrolyte by direct electrolytic reduction of vanadium pentoxide, which adopts a diaphragm electrolytic cell, takes a granular conductive material as a cathode material, takes an acidic aqueous solution containing vanadium pentoxide powder as a catholyte and takes an acidic aqueous solution as an anolyte. Direct current or pulse current sequentially passes through the anolyte, the diaphragm and the catholyte from the anode to the cathode, and pentavalent vanadium is reduced into tetravalent or trivalent vanadium ions. And under the current density of 20-30 A / dm < 2 >, the current efficiency can be improved by 18-22%.

The application provides a preparation method of an aluminum vanadium ferromanganese alloy and belongs to the field of materials. The method comprises the following steps: sequentially drying and sintering deactivated MnFe2O4 / chitosan composite microspheres to obtain MnFe2O4 powder; mixing the MnFe2O4 powder and vanadium pentoxide powder, and then sequentially performing combustion melting, casting, cooling and crushing to obtain flaky MnFe2VO9; and mixing the flaky MnFe2VO9, aluminum powder and calcium oxide to perform aluminothermic reaction to obtain the aluminum vanadium ferromanganese alloy. The deactivated MnFe2O4 / chitosan composite microspheres are used as raw materials, the water, chitosan and organic dyes in the composite microspheres are removed through drying and calcination, the MnFe2O4 powder and vanadium pentoxide powder are uniformly mixed, the flaky MnFe2VO9 is prepared through a melting method, the flaky MnFe2VO9 is used as raw material, the aluminum powder and calcium oxide are combined to prepare the aluminum vanadium ferromanganese alloy, and resource utilization is realized.

The invention discloses a preparation method of a large-area vanadium disulfide film, a photoelectric detector and application, and the preparation method comprises the following steps: 1, high-temperature annealing pretreatment: placing a sapphire substrate material in a mixed atmosphere of argon and oxygen, and carrying out the high-temperature annealing treatment, thereby obtaining a pretreated substrate; and 2, low-pressure chemical vapor deposition is conducted, specifically, sulfur powder and vanadium pentoxide powder serve as precursors to conduct low-pressure chemical vapor deposition on the substrate pretreated in the step 1, growth is conducted for 15-20 min, and the large-area vanadium disulfide thin film is obtained. The prepared large-area vanadium disulfide film is used for preparing a photoelectric detector, and the photoelectric detector shows relatively high negative photoconductive responsivity and adjustable positive and negative photoconductive characteristics.

The application provides a vanadium pentoxide target material and a preparation method thereof. The preparation method comprises the following steps: ball-milling vanadium pentoxide powder and a dopant to obtain a mixed powder, and sequentially performing cold isostatic pressing, intermediate heat treatment, hot isostatic pressing and annealing on the mixed powder, and finally obtaining the vanadium pentoxide target material. The preparation method provided by the application realizes the preparation of a high-quality vanadium pentoxide target material through the combination of multiple pressure and heat treatment processes, and simultaneously realizes the improvement of the purity, density and uniformity of the vanadium pentoxide target material. The density of the target material reaches 99%, and the purity reaches 99.99%, which can greatly improve the quality of a vanadium pentoxide film.

The invention relates to a strontium vanadate-based proton and electron mixed conductive material and a preparation method thereof, the molecular formula is SrV < 1-x > MxO < 3-delta >, and the doping element M is Ga < 3 + >, Cu < 2 + > and Cr < 3 + >; the method comprises the following steps that firstly, strontium carbonate powder, vanadium pentoxide powder and doped low-valence oxide powder are prepared to be mixed according to the molar ratio of Sr: V: M being 1: 1-x: x; secondly, by taking water or absolute ethyl alcohol as a ball milling medium, carrying out ball milling on the mixed powder and then drying; and finally, carrying out compression molding, calcining in hydrogen / argon mixed protective gas with the concentration of 1-10% at the temperature of 1300-1600 DEG C for 5-20 hours, and carrying out furnace cooling in the mixed protective gas. The single-phase mixed conductive material has proton and electron conductivity, meets the application requirements of the material in the fields of hydrogen separation membranes, anode materials of fuel cells, electrode materials for electrochemical synthesis and electrolysis and the like, and has a good application prospect.

The invention relates to the technical field of calcium method vanadium extraction, and provides a vanadium slag calcification vanadium extraction process which comprises the following steps: S1, mixing pretreated vanadium slag with limestone powder, and roasting to obtain clinker vanadium slag; s2, pulping the clinker vanadium slag, then carrying out first-time acid leaching and separation to obtain a first-time leaching solution and first-time tailings, pulping the first-time tailings, then carrying out second-time acid leaching and separation to obtain a second-time leaching solution and second-time tailings; and S3, ammonium sulfate is added into the first-time leaching solution, vanadium precipitation treatment and filtering are carried out, supernate and sediment are obtained, the sediment is dried and calcined, and vanadium pentoxide powder is obtained. Through the technical scheme, the problems of low vanadium leaching rate and relatively high vanadium extraction process cost in a vanadium slag vanadium extraction process in related technologies are solved.

The invention discloses a preparation method of a durable and effective M-phase VO2 film, which comprises the following steps: dissolving vanadium pentoxide powder in hydrogen peroxide with the mass concentration of 30%, reacting to obtain sol, and controlling the mass volume ratio of vanadium pentoxide to hydrogen peroxide to be (0.35-0.45) g / 30mL; uniformly coating the sol on a substrate material, and drying to obtain gel; and carrying out vacuum annealing treatment on the gel to obtain the M-phase VO2 thin film. The VO2 thin film prepared by utilizing vanadium pentoxide and hydrogen peroxide in a specific proportion and adopting a sol-gel method is stable in structure, has a near-infrared phase change effect of more than 8 years on the basis of keeping good visible light transmittance, is good in durability, and can fully meet the long-term use requirement of a user.