365results about "Vanadium oxides" patented technology

The invention relates to the technical field of waste catalyst recovery, and particularly discloses a method for recovering valuable metals from a waste catalyst containing vanadium and molybdenum. Comprising the following steps: S1, heating and roasting the waste catalyst containing vanadium and molybdenum, continuously heating and roasting, and cooling to obtain a roasted material; s2, mixing the roasted material with a sulfuric acid solution A containing oxalic acid, and heating and leaching to obtain a leaching solution A and a residue A; mixing the residue A with a sulfuric acid solution B containing thiourea and ethylenediaminetetraacetic acid, heating, carrying out secondary leaching to obtain a leaching solution B and a residue B, and washing the residue B with an acid solution to obtain a washing solution; combining the leaching solution and the washing solution to obtain a combined solution; s3, adjusting the pH value of the mixed solution to 2.5-3, then adjusting the pH value to 4.5-5, adding a dimethylglyoxime alcohol solution, and heating to obtain a purified solution; uniformly mixing the purified liquid with the extraction liquid to obtain an organic phase containing vanadium and molybdenum; and S4, reverse extraction and product preparation. The ammonium molybdate and the vanadium pentoxide obtained in the invention have high purity, and the recovery rate of vanadium and molybdenum is high.

The invention relates to the technical field of vanadium pentoxide preparation, and particularly discloses a preparation method of high-purity vanadium pentoxide, which comprises the following steps: S1, vanadium slag pretreatment: carrying out microwave activation on vanadium slag, and then carrying out ball milling and roasting to obtain clinker; the sulfuric acid-oxalic acid composite acid and the clinker are mixed and leached, the pH is adjusted after leaching is completed, and vanadium-containing leachate is obtained through filtering; s3, vanadium enrichment: heating the vanadium-containing leachate, adding a sodium carbonate solution while stirring, adjusting the pH value, preserving heat and curing, and then carrying out hot filtration to obtain vanadium-rich filter residues; s4, vanadium purification: mixing the vanadium-rich filter residues with a sodium hydroxide solution, stirring, introducing compressed air while stirring, and carrying out hot filtration after the reaction is finished, so as to obtain vanadium-rich filtrate; and S5, calcining: carrying out two-stage calcining on the ammonium metavanadate precursor to obtain high-purity V2O5. The preparation method is high in vanadium recovery rate, and the purity of the prepared V2O5 is 99% or above.

The invention belongs to the field of hydrometallurgy, and particularly discloses a high-purity vanadium oxide electrode and a preparation method thereof. The method comprises the following steps: pre-treating the alkaline vanadium leaching solution by using an activated aluminum oxide adsorption column to obtain a pre-treated solution; adding a composite impurity removal agent taking modified lignosulfonate as a main agent into the pretreatment liquid for primary impurity removal to obtain primary impurity-removed filtrate; adding a calcium hydroxide suspension and a flocculating agent into the primary impurity-removed filtrate for secondary impurity removal to obtain secondary impurity-removed filtrate; purifying the secondary impurity-removed filtrate by using an ion exchange column to obtain a purified solution; ammonium salt is added into the purified liquid for vanadium precipitation, and ammonium metavanadate crystals are obtained; calcining the ammonium metavanadate crystal to obtain high-purity vanadium pentoxide; and preparing the high-purity vanadium oxide electrode by using the high-purity vanadium pentoxide. According to the scheme, the high-purity vanadium pentoxide is prepared by taking the alkaline vanadium leaching solution as a raw material through a multi-stage deep impurity removal process, and the high-purity vanadium oxide electrode is prepared by taking the alkaline vanadium leaching solution as the raw material.

An object of the present invention is to provide a negative thermal expansion material having better negative thermal expansion characteristics. The present invention is a negative thermal expansion material, comprising copper vanadium composite oxide powder dissolving Al atoms and represented by the following general formula (1), CuxMyVzOt (1). In general formula (1), M represents a metallic element with an atomic number of 11 or more other than Cu, V, and Al, 1.60≤x≤2.40, 0.00≤y≤0.40, 1.70≤z≤2.30, 6.00≤t≤9.00, 1.00≤x+y≤3.00, and a molar number of the Al atoms in terms of atoms>a molar number of M atoms in terms of atoms if an M element is contained.

The invention belongs to the field of functional nano materials, and relates to a method for large-scale preparation of monoclinic phase vanadium dioxide nano powder, a heat insulation film and application of the heat insulation film, and large-scale preparation of the monoclinic phase vanadium dioxide nano powder is successfully achieved by combining a coprecipitation method with low-temperature calcination. The obtained product has excellent size uniformity (the average particle size is 65 + / -10 nm) and an adjustable phase change characteristic (61-68 DEG C). The polymer-based composite film prepared based on the nano powder shows excellent optical performance, and the method has the advantages of mild reaction conditions (less than or equal to 600 DEG C), controllable product morphology and phase transition temperature and the like, and provides a reliable solution for industrial production of nano functional materials for intelligent windows.

The invention discloses a preparation method of 5N specified-grade high-purity vanadium pentoxide, which comprises the following steps: step S1, taking high-purity ammonium metavanadate as a raw material, mixing the raw material with pure water in proportion, heating for dissolving, and cooling to obtain an ammonium metavanadate solution; s2, enabling the ammonium metavanadate solution to pass through a resin column for adsorption, and collecting column passing liquid; s3, carrying out vacuum concentration on the column passing liquid, cooling and crystallizing the obtained concentrated liquid, and carrying out suction filtration to obtain primary crystals; s4, mixing the primary crystal with pure water in proportion, heating, filtering, cooling filtrate, crystallizing, filtering and washing with water to obtain a secondary crystal; step S5, repeating crystallization operation for 1-3 times to obtain recrystallized ammonium metavanadate; and step S6, putting ammonium metavanadate into a porcelain baking tray, putting the porcelain baking tray into a calcining furnace, vacuumizing, calcining and cooling to obtain a 5N specified-grade high-purity vanadium pentoxide product. The method has the characteristics of simple principle, convenience in operation, high reliability and the like, and the purity of vanadium pentoxide is remarkably improved.

The invention discloses a V6O13 nano material and a preparation method and application thereof, and belongs to the technical field of aqueous zinc ion batteries, the preparation method of the V6O13 nano material comprises the following steps: taking V2O5 as a vanadium source, and adopting a hydrothermal method to prepare an intermediate product; and the intermediate product is subjected to annealing treatment, and the V6O13 nanometer material is obtained. According to the preparation method disclosed by the invention, a hydrothermal-annealing synergistic strategy is adopted, firstly, an intermediate product is prepared by taking V2O5 as a vanadium source and adopting a hydrothermal method, and then, the V6O13 nano material with more complete lattice arrangement is obtained through high-temperature annealing, so that higher battery capacity and more stable long cycle life are realized, and a new scheme is provided for research on an aqueous zinc ion battery positive electrode material.

The invention belongs to the technical field of building glass and coating materials thereof, and discloses a one-step chemical synthesis method of W-VO2 (M) nano-particles and application of the W-VO2 (M) nano-particles in thermochromic smart windows.The method comprises the steps that firstly, ammonium metavanadate, hydrazine hydrate and ammonium metatungstate serve as raw materials, tungsten-doped M-phase vanadium dioxide nano-particles are chemically synthesized through a one-step hydrothermal method, and the tungsten-doped M-phase vanadium dioxide nano-particles are prepared; the obtained W-VO2 (M) nanoparticles are high in crystallinity, small in particle size (10-40nm), high in purity and low in phase change temperature; then, by taking a polyvinylpyrrolidone material as a parent material, uniformly distributing the W-VO2 (M) nanoparticles in PVP (Polyvinyl Pyrrolidone) to form a uniformly dispersed thin film; according to the application of the W-VO2 (M) nanoparticles in the thermochromic intelligent window, not only can high visible light transmittance be obtained, but also the solar energy regulation and control capability of the W-VO2 (M) nanoparticles can be improved, and the application of the W-VO2 (M) nanoparticles in the fields of the thermochromic intelligent window and radiation refrigeration is further promoted.

The invention belongs to the technical field of a VO2 low-dimensional structure growth process, and particularly relates to a chemical vapor deposition preparation method for realizing a natural bending VO2 nanowire with a controllable curvature radius. According to the method, a chemical vapor deposition system formed by a sliding rail type tube furnace is selected, a Si / SiO2 substrate is selected as a substrate, V2O5 powder is taken as a precursor, and controllable preparation of the bent VO2 nanowires with different curvature radiuses is successfully realized by comprehensively regulating and controlling growth parameters of chemical vapor deposition (CVD); the bottleneck that only conventional linear VO2 nanowires can be prepared through an existing chemical vapor deposition method is broken through. The bent VO2 nanowires with different curvature radiuses, which are prepared by the method disclosed by the invention, are relatively high in quality, good in crystallinity and uniformity, excellent in MIT characteristic and special in mechanical property. The method has the advantages of simplicity in operation, high repeatability, no toxic waste gas emission and the like, and is beneficial to large-scale popularization and application.

The invention relates to a preparation method of high-purity vanadium pentoxide, in particular to the field of high-purity vanadium pentoxide, which comprises the following steps: adding an impurity removal agent into a phosphorus-containing vanadium solution to remove impurities, and then carrying out solid-liquid separation to obtain filtrate; the obtained filtrate is sequentially subjected to first pH value adjustment, second pH value adjustment, ammonium salt vanadium precipitation, dehydration, calcination deamination and melting, and high-purity vanadium pentoxide is obtained; wherein the impurity removing agent is prepared from calcium salt and a flocculating agent; the final pH value of the first pH value adjustment is 4.5-5.5; the final pH value of the second pH value adjustment is 1.8-2.2. According to the preparation method provided by the invention, the vanadium in the vanadium liquid is efficiently recovered by matching the metallographic phase specific impurity removal process of the vanadium liquid with pH value adjustment, the purity of the obtained vanadium product is greater than or equal to 99.9%, and the recovery rate of the vanadium is greater than or equal to 98%.

The invention discloses a three-dimensional porous carbon encapsulated V2O5 carbon fiber electrode constructed by in-situ growth and a preparation method and application thereof, belongs to the technical field of aluminum ion battery positive electrode materials, and aims to solve the problems that the intercalation and deintercalation dynamics of AlCl4 in a polyacrylonitrile (Pan)-based carbon fiber is blocked due to disordered graphite structure, and the performance of the Pan-based carbon fiber is influenced. And the material cannot be used as an effective electrode material to be applied to an aluminum ion battery system. According to the preparation method, an in-situ growth technology is adopted, a three-dimensional porous carbon substrate is grown on the surface of carbon fiber, then an orthorhombic system vanadium pentoxide (V2O5) nano material which has high theoretical specific capacity and can realize large-current charging and discharging is packaged in the three-dimensional porous carbon substrate, and the V2O5-based carbon fiber electrode is prepared. According to the electrode, the electrostatic interaction between Al < 3 + > ions and crystal lattices is effectively relieved, the structural advantages of the carbon fibers and the energy storage performance of V2O5 are fully combined, the energy storage effect of the aluminum ion battery is remarkably improved, and a new effective scheme is provided for development of aluminum ion battery electrode materials.

The invention discloses a process for extracting high-purity vanadium pentoxide from ammonium polyvanadate, and belongs to the technical field of nonferrous metallurgy. According to the process, efficient purification of vanadium pentoxide is achieved through the steps of sodium hydroxide dissolution, pH adjustment, gradient impurity removal, precise filtration, freezing-unfreezing circulation, high-purity water washing, centrifugal dewatering, two-stage firing and the like. In the process, the gradient impurity removal technology effectively reduces the content of impurities such as iron, sodium and the like, the precision filtration system ensures low residue of the impurities, the freezing-unfreezing circulation step further improves the crystal purity, and the two-stage firing process realizes directional conversion of the alpha-V2O5 crystal form. The purity of the obtained vanadium pentoxide product reaches up to 99.99% or above, the Na < + > content is smaller than or equal to 2 ppm, the Fe residue is smaller than or equal to 5 ppm, the alpha-V2O5 crystal form proportion is larger than or equal to 98%, the problems that in a traditional process, deep impurity removal is difficult, the product purity is insufficient, and crystal form conversion is incomplete are remarkably solved, and an effective technical approach is provided for preparing high-purity vanadium pentoxide.

A process produces high-purity vanadium chemicals from vanadium raw materials having high molybdenum contents. Molybdenum is selectively precipitated via vanadium from alkaline vanadate solutions using the following process steps: providing a molybdenum-containing alkaline vanadate solution, adding calcium hydroxide as a precipitant in portions while keeping the pH constant between 6 and 7 using acid, mixing the solution, solid-liquid separation of the resulting suspension, and further processing the low-molybdenum alkaline vanadate solution to produce a high-purity vanadium chemical having a molybdenum content of at most 500 ppm.

The invention relates to the field of vanadium and chromium separation, and particularly discloses a sodium vanadium solution treatment method which comprises the following steps: S100, adding an alkaline reducing agent into a sodium vanadium solution, and carrying out reduction of hexavalent chromium and selective precipitation reaction of trivalent chromium; s200, at the later stage of the reaction in the step S100, urea is added into a solution system, and a deep removal reaction of silicon and chromium is carried out; and S300, after the reaction in the step S200 is finished, solid-liquid separation is conducted, silicon-chromium slag and purified vanadium liquid are obtained, silicon-chromium oxide is obtained after the silicon-chromium slag is treated and can be used for smelting silicon-chromium alloy, and the purified vanadium liquid is subsequently used for preparing a high-purity vanadium oxide product. According to the method, the vanadium sodium salt solution obtained through a vanadium slag sodium salt roasting-water leaching process is used as a raw material, hexavalent chromium in the solution is reduced through an alkaline reducing agent, selective precipitation separation of hexavalent chromium and vanadium is achieved, and meanwhile urea is supplemented to conduct synergistic precipitation removal on silicon in the solution.

The invention provides a resource comprehensive utilization method of vanadium-containing steel slag and vanadium extraction tailings, and belongs to the technical field of application of metallurgical slag. Comprising the following steps: (1) proportioning raw materials; (2) low-temperature roasting pretreatment; (3) directionally extracting vanadium; (4) cleaning, reducing and extracting iron; (5) residues are functionally utilized; from the perspective of the whole scheme, all the steps are closely connected and have a synergistic effect. The raw material ratio and low-temperature roasting pretreatment lay a good foundation for subsequent directional vanadium extraction and clean reduction iron extraction, so that the vanadium and iron extraction is more efficient; and the residues obtained after vanadium extraction and iron extraction are subjected to functional utilization to prepare the light-weight insulating bricks, so that zero emission and resource utilization of the waste residues are realized. The method not only solves the environmental problem caused by accumulation of the vanadium-containing steel slag and the vanadium extraction tailings, but also has a good industrial application prospect by efficiently recovering vanadium and iron resources and preparing the light insulating brick with a high additional value.

The invention provides a method for preparing high-purity vanadium pentoxide from carbonation leachate. The method comprises the following steps: S1, adding aluminum salt into the carbonation leachate to remove silicon, and carrying out solid-liquid separation to obtain silicon-removed liquid; s2, mixing the silicon-removed liquid with ammonium salt, and performing solid-liquid separation after vanadium precipitation to obtain crude ammonium metavanadate; s3, re-dissolving the coarse ammonium metavanadate, carrying out stirring reaction on the obtained coarse ammonium metavanadate re-dissolved slurry, and carrying out solid-liquid separation to obtain an ammonium metavanadate solution; s4, a complexing agent and ammonium salt are added into the ammonium metavanadate solution for vanadium precipitation, and high-purity ammonium metavanadate is obtained after solid-liquid separation; and S5, carrying out high-temperature calcination on the high-purity ammonium metavanadate to obtain the high-purity vanadium pentoxide. According to the method provided by the invention, the high-purity vanadium pentoxide with low impurity content is obtained by adopting the technological means of deeply removing silicon, re-dissolving to remove iron and separating cations such as calcium, potassium, sodium and the like into the vanadium product through complexing crystallization, and the method is simple in technological process, low in auxiliary material consumption and relatively low in cost.

The present invention relates to a magnesium hydride - vanadium pentoxide @ carbon composite hydrogen storage material and its preparation method and application, belonging to the technical field of the preparation of composite hydrogen storage materials. The magnesium hydride - vanadium pentoxide @ carbon composite hydrogen storage material (MgH2 - V2O5@C) of the present invention comprises vanadium pentoxide @ carbon (V2O5@C) nanomaterial powder and magnesium hydride (MgH2) nanomaterial powder, wherein the vanadium pentoxide @ carbon (V2O5@C) nanomaterial powder is coated on the surface of the magnesium hydride (MgH2) nanomaterial powder and the mass percentage of the vanadium pentoxide @ carbon (V2O5@C) nanomaterial powder is 0.1 - 15 wt.%. Due to the doping of the V2O5@C catalyst, the hydrogen storage performance of the composite hydrogen storage material (MgH2 - V2O5@C) of the present invention is significantly improved.

The invention provides a method for preparing high-purity vanadium pentoxide from a sodium vanadium solution. The method comprises the following steps: firstly, through chromium removal, calcium removal and silicon removal treatment, reducing the contents of chromium, calcium and silicon in the sodium vanadium solution to a target requirement, namely Crlt; the concentration is 0.005 g / L, and the concentration is Cat; 0.01 g / L, Silt; 0.01 g / L; then, aluminum is removed through a two-step method, the pH of the system can be accurately controlled, and the aluminum content in the solution is reduced to be smaller than 0.001 g / L; finally, ammonium salt is added to obtain AMV sediment, after the potassium content in the AMV sediment is preferably controlled to be reduced to 0.001 wt%, calcination is conducted, a vanadium pentoxide product can be obtained, and the sulfur content can be lower than 0.001 wt%.

This invention belongs to the field of microwave absorbing material preparation technology, and discloses a two-step partial oxidation method to improve the microwave absorption performance of MXene materials. By performing hydrothermal pre-oxidation and heat treatment on MXene materials, oxide nanoparticles are grown in situ on their surface, achieving controllable partial oxidation. The MXene matrix retains a two-dimensional layered structure, and a heterogeneous interface is formed between the oxide nanoparticles and the MXene matrix. This adjusts the conductivity, optimizes impedance matching, enhances interface polarization, improves microwave absorption performance, and provides high-temperature stability.

The invention relates to a method for preparing vanadium, chromium, aluminum and silicon products through gradient separation of vanadium shale. According to the technical scheme, silicon in the vanadium shale alkaline leaching solution is removed through a sulfuric acid precipitation method, and a desilicication solution and a siliceous precursor I are obtained; washing the siliceous precursor I with sulfuric acid, washing with water and calcining to obtain white carbon black; carrying out vanadium-chromium co-extraction on the desilicication liquid by adopting an amine extraction agent to obtain a vanadium-chromium organic phase; carrying out vanadium-aluminum extraction separation on the washing liquid by adopting an amine extraction agent to obtain a vanadium-rich organic phase and an aluminum-containing raffinate; the vanadium-rich organic phase and the vanadium-chromium organic phase are mixed, vanadium-chromium separation is achieved through step-by-step reverse extraction, and vanadium-rich liquid and chromium-rich liquid are obtained; adjusting the pH value of the aluminum-containing raffinate to precipitate aluminum hydroxide, and calcining to obtain aluminum oxide; carrying out ammonium salt vanadium precipitation on the vanadium-rich liquid to obtain ammonium polyvanadate, and calcining to obtain vanadium pentoxide; and reducing the chromium-rich liquid, adjusting the pH value, precipitating chromium hydroxide, and calcining to obtain chromium sesquioxide. The method is high in leaching rate, small in slag amount, high in product purity and high in recovery rate.

The invention relates to a vanadium oxide coated and zirconium-doped modified precursor and a preparation method and application thereof.According to the preparation method, zirconium doping and an ammonium vanadate solution are specifically used, cation mixing is inhibited through the stabilization effect of zirconium, lattice distortion is reduced, the stable unit cell volume can be maintained through zirconium doping, and the stability of the unit cell volume is improved; and the problem of unit cell expansion caused by conventional doping elements is avoided, so that the high-rate performance of the material is reserved. The semiconductor-metal phase change characteristic of vanadium oxide is utilized, the critical temperature can be adjusted to be close to the room temperature, and the high-temperature stability and electronic conductivity of the material are improved; through the combination of the two, the high-rate discharge performance of the ternary positive electrode material and the structural stability of the material can be greatly improved.

The invention belongs to the field of vanadium batteries, and particularly discloses a vanadium battery key material as well as a preparation method and a preparation system thereof. The method comprises the following steps: adding ammonium salt and acid into an alkaline vanadium-containing leaching solution, and carrying out weak acid ammonium salt vanadium precipitation reaction under the conditions that the pH is 4-6 and the temperature is 20-85 DEG C to obtain a sodium ammonium decavanadate solid; the method comprises the following steps: mixing a sodium ammonium decavanadate solid with a solution containing ammonium ions, and carrying out solid-phase crystal transformation ammonium sodium replacement reaction at the temperature of 90-100 DEG C to obtain high-purity ammonium vanadate; directly calcining the high-purity ammonium vanadate or calcining the high-purity ammonium vanadate after re-dissolution recrystallization to obtain high-purity vanadium pentoxide; the high-purity vanadium pentoxide is used for preparing a vanadium battery key material. According to the scheme, the alkaline vanadium-containing leachate serves as the raw material, deep removal of impurities is achieved through weak acid ammonium salt vanadium precipitation and solid-phase crystal transformation ammonium sodium replacement, high-purity ammonium vanadate is prepared, high-purity vanadium pentoxide is further prepared, and the high-performance vanadium battery key material is prepared with the high-purity vanadium pentoxide serving as the raw material.

This application relates to the technical field of waste catalyst recovery, and specifically discloses a method for recovering valuable metals from vanadium-molybdenum-containing waste catalysts. The method includes the following steps: S1: Heating the vanadium-molybdenum-containing waste catalyst for roasting, continuously heating for roasting, and then cooling to obtain a roasted material; S2: Mixing the roasted material with sulfuric acid solution A containing oxalic acid, heating for leaching to obtain leaching solution A and residue A; Mixing residue A with sulfuric acid solution B containing thiourea and ethylenediaminetetraacetic acid, heating for secondary leaching to obtain leaching solution B and residue B, washing residue B with acid solution to obtain a washing solution; Combining the leaching solutions and the washing solution to obtain a combined solution; S3: Adjusting the pH of the combined solution to 2.5 - 3, then adjusting the pH to 4.5 - 5, adding dimethylglyoxime alcohol solution, heating to obtain a purified solution; Mixing the purified solution with an extraction solution evenly to obtain a vanadium-molybdenum-containing organic phase; S4: Back-extraction and product preparation. The ammonium molybdate and vanadium pentoxide obtained in this application have high purity, and the recovery rates of vanadium and molybdenum are relatively high.

A lithium-ion battery anode material containing surface-coated disordered rocksalt lithium vanadium oxide is disclosed. The surface coating contains a species selected from the group consisting of carbon, a metal oxide, a metalloid oxide, a metal fluoride, a metalloid fluoride, a metal phosphate, a metalloid phosphate, and combinations thereof. Materials, designs, synthesis methods, and devices related to fast-charging lithium-ion batteries are provided. This invention fills a technology gap by providing anode materials with disordered rocksalt lithium vanadium oxides to achieve fast charging in 10 minutes or less, greater than 200 W·h / kg energy density, a lifetime of at least 10,000 cycles, and improved battery safety. Methods of making and using the optionally surface-coated disordered rocksalt lithium vanadium oxide are disclosed. Many experimental examples are included, demonstrating several remarkable attributes of this battery technology.

A system for plant-mediated synthesis and characterization of vanadium pentoxide (V2O5) nanoparticles, comprising a structurally integrated device configured to perform extraction, reaction, calcination and performance evaluation within a closed automated control loop, wherein the system includes: a basic chassis made of heat-insulated stainless steel, which houses a microcontroller-based central control unit; a bioextract preparation unit fluidically connected to a reactive mixing chamber, the bioextract preparation unit comprising a Soxhlet extractor with a borosilicate condenser, a thermostatically controlled heating jacket and a digital thermocouple to maintain extraction temperatures between 60°C and 70°C; a precursor feed vessel containing an ammonium metavanadate solution with a molarity between 0.1 M and 0.3 M, wherein this vessel is connected to the reaction mixing chamber via an electromagnetically actuated inlet valve and a precision peristaltic pump; a reaction mixing chamber with an inductive heating coil, a magnetic stirrer plate and a temperature and pH monitoring device configured to maintain a uniform reaction temperature of 70±2°C during the precursor-extract interaction; a calcination module consisting of a muffle furnace lined with refractory ceramic material and containing embedded nichrome heating elements controlled by a PID-controlled temperature controller to achieve a heating rate between 5 °C and 10 °C per minute up to a setpoint of 445±5 °C for combustion synthesis; an optical characterization module with integrated UV-VIS spectrometer, Fourier transform infrared analyzer and photoluminescence detector, each optically isolated and electronically connected to the control unit; and a photocatalytic and antibacterial test chamber fluidically connected to the output of the calcination module, the chamber comprising a UV irradiation array, an optical absorption sensor and a temperature-controlled bacterial incubation plate, the central control unit includes a programmable logic controller (PLC) configured to synchronize the operation of all submodules via feedback control loops, which receive data from temperature, pH and optical sensors, thereby automating the synthesis, analysis and testing of V2O5 nanoparticles.

This disclosure concerns a method of extracting vanadium, comprising mixing carbon soot ash with a leaching agent and an oxidising agent in a polar solvent in order to form a mixture and reacting the mixture in order to form vanadium 5 (V) ions; filtrating the mixture in order to separate a vanadium leachate from a leached ash; and purifying the vanadium leachate in order to obtain a vanadium filtrate. A weight ratio of carbon soot ash to polar solvent is about 1:2 to about 1:10. A mole ratio of leaching agent to oxidising agent is about 2:0.3 to about 2:2. This disclosure concerns a method of producing vanadium pentoxide.

The application provides a Magnéli phase V6O 11 The application provides a piezoelectric catalyst, a preparation method and application thereof, the preparation method comprising the following steps: step 1: dissolving NH4VO3 in a citric acid solution, uniformly stirring to form a precursor solution A; carrying out a hydrothermal reaction on the precursor solution A, separating and washing and drying the obtained product to obtain a powder NH4(V3O8); step 2: dissolving VO2 powder and NH4(V3O8) powder in a mixed solution of isopropyl alcohol and H2O, uniformly stirring to form a precursor solution B, carrying out a hydrothermal reaction on the precursor solution B, separating and washing and drying the obtained product to obtain a Magnéli phase V6O 11 The application provides a piezoelectric catalyst, a preparation method and application thereof, the preparation method comprising the following steps: step 1: dissolving NH4VO3 in a citric acid solution, uniformly stirring to form a precursor solution A; carrying out a hydrothermal reaction on the precursor solution A, separating and washing and drying the obtained product to obtain a powder NH4(V3O8); step 2: dissolving VO2 powder and NH4(V3O8) powder in a mixed solution of isopropyl alcohol and H2O, uniformly stirring to form a precursor solution B, carrying out a hydrothermal reaction on the precursor solution B, separating and washing and drying the obtained product to obtain a Magnéli phase V6O 11 The application provides a piezoelectric catalyst, a preparation method and application thereof, the preparation method comprising the following steps: step 1: dissolving NH4VO3 in a citric acid solution, uniformly stirring to form a precursor solution A; carrying out a hydrothermal reaction on the precursor solution A, separating and washing and drying the obtained product to obtain a powder NH4(V3O8); step 2: dissolving VO2 powder and NH4(V3O8) powder in a mixed solution of isopropyl alcohol and H2O, uniformly stirring to form a precursor solution B, carrying out a hydrothermal reaction on the precursor solution B, separating and washing and drying the obtained product to obtain a Magnéli phase V6O

A composition according to the present disclosure contains water, lithium hydroxide, an organic substance that does not have a carboxyl group and dissolves in water, and an active material, wherein the lithium hydroxide content is 10% or more in terms of mass ratio with respect to the water.

The invention discloses a vanadium oxide nanosheet aggregate self-supporting electrode material and a preparation method thereof.The preparation method comprises the steps that 1, 0.5-1 g of ammonium metavanadate, 0.5-1 mg of oxalic acid and 0.1-0.4 g of mesoporous molecular sieve MCM-48 are taken and added into 20-40 mL of ultrapure water, full stirring is conducted, and a mixed solution is obtained; step 2, putting pretreated foamed nickel into the mixed solution in the step 1, putting the mixed solution into a reaction kettle, putting the reaction kettle into a drying oven, and carrying out hydrothermal reaction at 140-180 DEG C; 3, after the reaction is finished, the reaction kettle is naturally cooled to the room temperature, the foamed nickel is taken out, the foamed nickel is subjected to water washing and alcohol washing alternately, the foamed nickel is placed in air to be naturally aired after washing, and the uniform vanadium oxide nanosheets are obtained. The vanadium oxide nanosheet aggregate self-supporting electrode material is prepared by adopting a low-temperature one-step hydrothermal synthesis method, the vanadium oxide nanosheet aggregate self-supporting electrode material has a unique microstructure, namely a nanosheet with the thickness of 100-200nm, and the structure can greatly improve the electrochemical performance and catalytic performance of vanadium oxide serving as an electrocatalyst.

The invention relates to the technical field of materials, in particular to a positive active material and a preparation method and application thereof. According to the preparation method provided by the invention, after the V2O5 and nano Al2O3 mixture reacts under the thermoelectric coupling field to obtain the material containing V2O5 and Al2O3, carbon coating is carried out on the material by taking CO2 as a carbon source, the obtained positive active material has the advantages of high coating rate, large specific surface area and multiple active sites, and the assembled battery has the advantages of large specific capacity, small first-circle loss rate and the like. Experiments show that when the positive active material provided by the invention is applied to the lithium ion battery, the conductivity is 9 * 10 <-4 >-4 * 10 <-3 > S / m; the charge transfer impedance is 438 to 201 omega; the thermal expansion coefficient is 4 * 10 <-6 >-7 * 10 <-6 > / The first discharge specific capacity is 273 to 289 mAh / g; the discharge capacity of the battery in 100 cycles is 253-278 mAh / g, and the cycle efficiency is 91%-96%.