204 results about "Vanadate" patented technology

The invention provides a supported catalyst as well as a preparation method and application thereof. The preparation method of the supported catalyst comprises the following steps: S1, carrying out precipitation reaction on vanadate and first ammonium salt in a first solvent to obtain a first product system containing a carrier precursor; s2, enabling the carrier precursor, a second ammonium salt, a noble metal-containing compound, a chelating agent and a first reducing agent to react in a second solvent to obtain a second product system containing a catalyst precursor; and S3, carrying out annealing treatment on the catalyst precursor and a second reducing agent in protective gas to obtain the supported catalyst. The noble metal in the supported catalyst prepared by the method is not easy to migrate and aggregate, and the stability is better. In addition, the dosage of precious metal needed by the preparation method is smaller, and the atom utilization rate is higher.

The invention discloses a novel photocatalyst for producing hydrogen from organic matter wastewater and a preparation method of the novel photocatalyst, and relates to the technical field of photocatalysis. The photocatalyst disclosed by the invention is combined with oxidation-reduction capability, and can effectively degrade and produce hydrogen under the irradiation of sunlight. Through combination of quaternized porous tungsten oxide and vanadate radicals, silver vanadate load growth is promoted, the sunlight utilization rate is increased, and the electron-hole recombination rate is reduced. Reduced graphene oxide is used for pretreatment, active groups are introduced, the reduced graphene oxide is compounded with tungsten oxide / silver vanadate, the binding force is enhanced through heat treatment, photo-induced electron-hole pair compounding is inhibited through the conductivity, and the visible light catalytic performance is improved. The adsorption effect of porous tungsten trioxide and reduced graphene oxide can accelerate the degradation of organic matters. By optimizing the proportion of silver vanadate, tungsten oxide and reduced graphene oxide, the visible light response and charge separation efficiency are enhanced, the degradation and hydrogen production performance is improved, and light corrosion is reduced.

The invention provides a lithium iron phosphate composite material and a preparation method thereof, a positive pole piece and a secondary battery, the lithium iron phosphate composite material comprises a core layer, the core layer comprises an inner core, a coating layer coating the inner core, and a mutual doping layer located between the coating layer and the inner core; wherein the material of the inner core comprises lithium iron phosphate, the material of the coating layer comprises sodium vanadium fluorophosphate, and the material of the mutual doping layer comprises vanadium-doped lithium iron phosphate. A core layer of the lithium iron phosphate composite material adopts lithium iron phosphate as an inner core, the inner core is coated with sodium vanadium fluorophosphate, and a mutual doping layer structure is arranged between the inner core and a coating layer, so that mixed migration of Li / Na ions is realized, and meanwhile, the lithium iron phosphate composite material has excellent ion diffusion efficiency, relatively high theoretical specific capacity and a relatively high voltage platform; the material has low powder resistivity, a stable charge-discharge platform and excellent cycle performance, and the electrochemical performance such as energy density and cycle performance is effectively improved.

The invention provides a vanadium aluminum phosphate electrode material and a preparation method thereof. In target product components, an aluminum source, a vanadium source and a phosphorus source are respectively aluminum nitrate or other aluminum sources, vanadium pentoxide or ammonium vanadate, ammonium dihydrogen phosphate, phosphoric acid or other phosphorus sources, and a nitrogen source of nitrogen-doped carbon is from polyvinylpyrrolidone or other nitrogen sources of a gel component; the carbon source is selected from polyvinyl alcohol and glycerol. By adopting an exogenous plasticizing physical crosslinking sol-gel method, in the whole reaction system, uniform distribution of reaction ions and intermediates is maintained, and finally, gel is networked, so that the problem of capacity fading caused by an unstable structure of an existing aluminum ion battery positive electrode material in a circulating process is solved, and the service life of the aluminum ion battery positive electrode material is prolonged. And the problems of high reaction system selection requirement, long preparation period and complex process of the existing endogenous covalent polycondensation sol-gel method for preparing the electrode material are solved.

The invention discloses an aqueous zinc ion battery electrolyte as well as a preparation method and application thereof, and belongs to the technical field of zinc ion batteries. The vanadic acid additive takes a Zn-sulfonated hydrogen bond organic framework as a carrier, and 4-6wt% of vanadate is loaded on the surface of the carrier. Sulfonic acid groups contained in the carrier can cooperate with vanadate to preferentially adsorb free water molecules in an aqueous electrolyte, the erosion activity of the water molecules on the positive electrode material is reduced, a hydrogen bond network structure of the hydrogen bond organic framework can selectively intercept active water molecules, and the water molecules are prevented from participating in oxidation reduction dissolution of the vanadium-based positive electrode material. Meanwhile, the zinc metal ions doped in the carrier can cooperate with the strong polarity of the sulfonic group, regulate and control the solvation structure, reduce the interface impedance and inhibit the growth of zinc dendrites, so that the long-term stability of the aqueous zinc ion battery is improved, and the aqueous zinc ion battery electrolyte capable of inhibiting the dissolution of a positive electrode and stabilizing a zinc negative electrode is obtained.

The invention discloses a silver vanadate photocatalytic material, a preparation method thereof and an illuminating lamp. The preparation method comprises the following steps: firstly, respectively dissolving NH4VO3 and AgNO3 in deionized water, uniformly mixing by magnetic stirring, adjusting the pH value of the solution, and then carrying out hydrothermal synthesis reaction to obtain the Ag3VO4 photocatalytic material. The Ag3VO4 photocatalytic material with controllable morphology, uniform particle size and good dispersity is prepared by adopting a synthesis strategy of a one-step hydrothermal method, the performance of the photocatalyst is optimized by regulating and controlling the pH value, the raw materials and the process are simple, the conditions are easy to control, the cost is low, the photocatalytic degradation rate of the catalyst to organic pollutants is high, and the method is suitable for industrial production. The stability of a crystal structure and catalytic activity can be kept under long-term illumination, and the functional application of a photocatalytic air purification technology can be realized by integrating with an illumination lamp.

The invention relates to a method for extracting vanadium by using high-calcium steel slag and titanium dioxide waste acid, and relates to the technical field of resource utilization of metallurgical chemical waste, the method comprises the following steps: crushing high-calcium steel slag to obtain high-calcium steel slag powder; mixing the high-calcium steel slag powder and the titanium white waste acid to obtain a mixture; the mixture is heated and stirred for a reaction, then solid-liquid separation is conducted, and filtrate containing vanadate is obtained; the filtrate containing vanadate is subjected to purification treatment, and purified filtrate is obtained; and the purified filtrate is purified and refined, and a vanadium product is obtained. According to the method, the high-calcium steel slag and the titanium white waste acid are comprehensively treated, so that the resource utilization of wastes is realized, the environmental pollution is reduced, the process is simple and feasible, the operability is high, additional specific equipment is not needed, and the method has a good industrial application prospect. Meanwhile, the obtained vanadium product is high in purity and can be widely applied to the fields of steel, aerospace, chemical engineering and the like.

The invention discloses a separation and purification method of vanadium-containing tungstate. The method comprises the following steps: providing a vanadium-containing tungstate aqueous solution; providing an extraction liquid, wherein the extraction liquid comprises a sulfuric acid type quaternary ammonium salt extraction agent, a modifier and an organic solvent; mixing the vanadium-containing tungstate aqueous solution with the extraction liquid, and performing first extraction to obtain a first extraction phase and a first raffinate phase; providing strip liquor, wherein the strip liquor comprises alkali metal sulfate and alkali metal hydroxide; mixing the first extraction phase with the strip liquor, and carrying out first reverse extraction to obtain an alkali metal vanadate solution; and carrying out the same extraction and reverse extraction method on the first raffinate phase to obtain an alkali metal tungstate radical solution, thereby realizing respective separation and purification of vanadate radicals and tungstate radicals.

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 discloses an all-vanadium electrolyte, a preparation method thereof and an all-vanadium redox flow battery, and belongs to the technical field of batteries. The method comprises the steps that S1, alkaline leaching treatment is conducted on the vanadium slag through an alkaline leaching agent, an alkaline leaching product is obtained, and a vanadium enrichment is separated out; s2, mixing the vanadium concentrate, a first ammonium salt and a first solvent for reaction II to obtain a vanadium precipitation product, and separating to obtain an ammonium vanadate-containing sediment; carrying out first calcining heat treatment on the mixture to obtain vanadium oxide; mixing the vanadium oxide with a first reducing agent and a second solvent for reaction III to obtain a first tetravalent vanadium-containing solution; and S3, under the action of a hydrogen evolution catalyst, the first tetravalent vanadium is subjected to a reaction IV, and a trivalent vanadium-containing solution is obtained. According to the method, all-vanadium electrolyte with different valence states can be efficiently extracted, vanadium slag solid waste resource utilization is achieved, the production cost is effectively reduced, and the environmental protection risk is reduced; and meanwhile, the vanadium ion reduction rate is increased by means of the hydrogen evolution electrocatalyst, other reducing agents are not introduced, and the operation safety and reliability are improved.

The invention relates to the technical field of new energy, and provides a dual surface modification method for a lithium-rich layered positive electrode material. The method comprises the following steps: taking a lithium-rich layered positive electrode material sample, adding the lithium-rich layered positive electrode material sample into a pre-prepared vanadyl sulfate solution, and uniformly stirring to enable the lithium-rich layered positive electrode material sample and the vanadyl sulfate solution to react to obtain a mixed solution; adding an alkaline solution into the mixed solution, adjusting the pH value of the mixed solution to 7-10, and continuously stirring until the reaction is sufficient; filtering, washing and drying the fully reacted solution to obtain a lithium-rich layered positive electrode material precursor with a passivated surface and a VO2 coating; and heating the lithium-rich layered positive electrode material precursor to 400-700 DEG C in an inert gas atmosphere, and then carrying out heat preservation and furnace cooling to obtain the lithium-rich layered positive electrode material with a passivation layer and a VO2 coating layer on the surface. According to the method, surface passivation and surface coating of the lithium-rich layered positive electrode material are synchronously realized, and a method which is simple in step, easy in reaction condition control, low in production cost and capable of being applied on a large scale is provided.

The invention discloses a vanadium iron-site doped iron phosphate material and a preparation method, and relates to the technical field of lithium ion battery positive electrode material preparation, pure water is used as a base solution, and a vanadium salt solution with the pH value of 2.0-3.0, a ferrite solution with the pH value of 1.0-2.5 and a phosphorus-oxygen mixed solution with the pH value of 5.0-7.0 are simultaneously added into a reaction kettle in a three-strand parallel flow mode for a co-precipitation reaction. By controlling the acid environment of a key solution system, reduction of metavanadate radicals or generation of ferric vanadate precipitates is effectively inhibited, and vanadium elements are successfully and uniformly doped to iron sites of iron phosphate crystal lattices; the mass ratio of iron to phosphorus in the obtained iron phosphate material is stabilized at 95-98%, the doping amount of vanadium is 100-10000 ppm, and the vanadium is uniformly distributed. Lithium iron phosphate prepared by taking the material as a precursor has higher discharge capacity and compaction density, and the electrochemical performance of a lithium ion battery is remarkably improved.

The invention relates to the technical field of sodium ion battery positive electrode materials, and discloses a preparation method of a high-entropy sodium vanadium phosphate electrode, which comprises the following steps: step 1, adding 2.7 g of ammonium vanadate and 16.8 g of oxalic acid into 200 mL of deionized water, and stirring to react for 20-80 minutes at the temperature of 60-120 DEG C; 2, after slight cooling, 0.75 g of ferric nitrate, 0.81 g of manganese nitrate, 0.80 g of chromic nitrate, 0.58 g of cobalt nitrate and 0.49 g of nickel nitrate which are dissolved with 100 mL of deionized water are added; and step 3, after stirring, adding 8.3 g of sodium dihydrogen phosphate which is dissolved by 100mL of deionized water. The precursor is prepared by adopting a chemical synthesis method, and the high-entropy metal doped sodium vanadium phosphate positive electrode material is prepared by adopting a Joule thermal process. Compared with a traditional calcination process, the process has the advantages of high heating speed, low energy consumption, mild reaction conditions, high product purity, good particle size uniformity, easiness in control of the proportion of each component and the like, and continuous preparation can be realized.

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.

The invention discloses a multi-element rare earth doped vanadate-based luminescent material and a preparation method thereof, and belongs to the field of rare earth luminescent material preparation. A multi-element rare earth doped vanadate-based luminescent material comprises A, B and C, A, B and C are rare earth elements, A, B and C are different, the chemical formula of the luminescent material is (AxB1-x) 1-yVO4: Cy, x is more than or equal to 0.10 and less than or equal to 1.00, and y is more than or equal to 0.01 and less than or equal to 0.10; the invention can overcome the problems of general luminous intensity, poorer stability and shorter service life of the luminescent material.

The invention discloses a method for preparing alkali metal vanadate by a mechanochemical reaction method. The method comprises the following steps: mixing a vanadium-containing compound and an alkali metal compound according to the stoichiometric ratio of a target product, adding or not adding a protic solvent, and grinding to induce a mechanochemical reaction among the raw materials, so as to obtain the alkali metal vanadate, wherein the alkali metal vanadate is selected from one of NaVO3, KVO3, RbVO3, CsVO3, Rb3V5O14, Cs2V4O11 and Li3VO4, and the alkali metal vanadate is selected from one of NaVO3, KVO3, RbVO3, CsVO3, Rb3V5O14, Cs2V4O11 and Li3VO4. The preparation method has the advantages of being environmentally friendly, low in energy consumption, high in reaction efficiency and the like, efficient preparation of all series of alkali metal vanadate can be achieved, and the obtained alkali metal vanadate is high in purity, small in particle size and good in dispersity and has potential application value in the fields of lithium ion batteries, photocatalysis, laser crystals and the like.

The invention relates to the technical field of hydrometallurgy, and provides a method for cleanly extracting vanadium from vanadium slag based on dolomite. According to the method, dolomite is adopted to replace a traditional calcification or sodium salt roasting auxiliary agent to co-roast the vanadium slag, and vanadium in the vanadium slag is roasted through two-step temperature control to be converted into acid-soluble calcium magnesium vanadate roasting clinker. The roasting clinker is subjected to acid leaching to obtain vanadium liquid, the vanadium liquid is subjected to deep impurity removal through a magnesium ammonium phosphate precipitation method, ammonium sulfate is added into the vanadium liquid, the pH value is adjusted, acid ammonium salt vanadium precipitation is conducted, and ammonium polyvanadate is obtained. And washing, filtering, drying and calcining the ammonium polyvanadate to obtain high-purity powder vanadium pentoxide or melting and casting to obtain high-purity tablet vanadium pentoxide. Vanadium precipitation wastewater is subjected to reduction treatment, lime neutralization and solid-liquid separation and then is reused in a leaching system, and cyclic utilization of ammonium salt and water resources is achieved. By means of the technical scheme, the problem that in the related technology, the vanadium leaching rate is low is solved.

The invention provides a seven-core tungsten-vanadium heteropolyacid alkoxy derivative and a preparation method and application thereof, and belongs to the organic and inorganic hybrid material technology, the chemical formula of the seven-core tungsten-vanadium heteropolyacid alkoxy derivative is (C16H36N) 2 [WV6O16 {(OCH2) 3CCH2OH} 2], the seven-core tungsten-vanadium heteropolyacid alkoxy derivative is composed of a metal-oxygen cluster anion [WV6O16 {(OCH2) 3CCH2OH} 2] 2-and two tetrabutylammonium cations, the preparation method comprises the following steps: dissolving polytungstate, polyvanadate and a trihydroxymethyl compound in an anhydrous organic solvent according to a ratio, and carrying out microwave-assisted synthesis. According to the preparation method, the Tris functionalized heptanuclear tungsten-vanadium heteropolyacid with the metal tungsten-vanadium ratio of 1: 6 is prepared through a simple microwave-assisted synthesis method, the structural diversity of a tungsten-vanadium heteropolyacid system is enriched, and the synthesized heptanuclear tungsten-vanadium heteropolyacid alkoxy derivative has excellent oxidation-reduction capacity and has extremely high application value in the field of electro-catalytic hydrogen evolution.

This invention provides a method for in-situ removal of vanadium from wastewater. The method involves first adjusting the pH to acidity and then alkalinity, thereby controlling the degree of vanadium hydrolysis and disrupting the stable form of (meta)vanadate in the wastewater, causing it to primarily exist as VO2(OH)2. ‑ Vanadium exists in the form of vanadium, and when Fe(II) is added, it undergoes a redox reaction with V(V) in the wastewater, effectively reducing vanadium(V) in the wastewater to V, which has lower toxicity and is relatively unstable. 2+ (VI) Reduce wastewater toxicity; then adjust to an alkaline environment, utilizing the interaction of hydroxide ions, iron, and vanadium to precipitate vanadium into VO2·H2O and Fe2O3·V2O5·H2O, thus achieving vanadium removal. The entire process of this invention is easy to control, has a high vanadium removal rate, and requires a small amount of reducing agent.

The invention discloses an L-cysteine doped ammonium vanadate positive electrode material, a preparation method thereof and application of the L-cysteine doped ammonium vanadate positive electrode material in an aqueous zinc ion battery, and belongs to the technical field of materials. The preparation method comprises the following steps: adding ammonium metavanadate and oxalic acid into deionized water, stirring and mixing, then adding L-cysteine, carrying out hydrothermal reaction on the obtained mixed solution, cooling to room temperature, carrying out centrifugal cleaning, and carrying out vacuum drying to obtain the L-NVO. L-NVO is prepared through a simple one-step hydrothermal method, L-cysteine is doped into the electrode material through further reaction, the introduction of L-cysteine not only enlarges the interlayer spacing of NVO, but also participates in the storage of zinc ions, increases the active sites of the zinc ions, effectively promotes the diffusion of ions and charge transfer, and improves the electrochemical performance of the electrode material. The conductivity of the material is improved, the internal resistance of the material is reduced, and the structural flexibility and stability of the material are maintained, so that the overall performance of the aqueous zinc ion battery is improved.

The present application belongs to the technical field of inorganic chemical industry, and particularly relates to a method for preparing manganese vanadate from vanadium pentoxide. The method for preparing manganese vanadate from vanadium pentoxide is original, and the method for preparing manganese vanadate by roasting vanadium pentoxide in an inert gas atmosphere is used. Vanadium pentoxide powder is mixed with manganese carbonate (or manganese oxide) reagent to obtain manganese vanadate. As one of ternary vanadates, manganese vanadate has good electrochemical performance and optical performance, and can be applied in batteries and photoelectric materials. The method has great significance for the study of vanadium slag leaching mechanism and the development of subsequent products.

The invention discloses a method for comprehensively utilizing vanadium and chromium resources, which comprises the following steps: mixing chromium hydroxide with sodium hydroxide, and introducing oxygen for liquid-phase oxidation to obtain an oxidation solution; adding calcium oxide into the oxidation liquid, stirring and mixing, and performing solid-liquid separation after reaction to obtain calcium vanadate solid and vanadium-free alkali liquid; adding a decalcifying agent into the vanadium-free alkali liquor, and carrying out solid-liquid separation to obtain calcium carbonate and refined sodium chromate alkali liquor; reacting calcium vanadate with roasting slurry containing aluminum, silicon and carbonate to form calcium aluminosilicate precipitate and desiliconized high-vanadium alkali liquor; continuously neutralizing the desiliconized high-vanadium alkali liquor and the carbonization solution to obtain an aluminum-vanadium high-valued product and a neutral solution; the neutral liquid is carbonized, and obtained sodium bicarbonate and carbonized liquid can be returned to a system for recycling. The method for comprehensively utilizing the vanadium and chromium resources has the advantages of being simple in process, environmentally friendly, efficient, easy to control in operation, easy to obtain raw materials, low in production cost and the like.

The invention discloses a method for directly preparing ferrovanadium by taking ammonium vanadate as a raw material. The method comprises the steps of raw material pretreatment, vacuum heating decomposition, furnace charge mixing and aluminothermic reduction smelting. In the step of vacuum heating decomposition, the pretreated ammonium vanadate is loaded into a double-cone rotary vacuum dryer to be subjected to vacuum heating, so that the pretreated ammonium vanadate is decomposed, ammonia gas and water vapor are released, and a decomposition product with V2O4 and V2O5 as main components is obtained; the step of mixing the furnace charge comprises the following steps: uniformly mixing a decomposition product with aluminum powder, lime, iron powder and a cold charge according to the mass ratio of (60-120): (30-65): (6-10): (6-10): (6-15) based on the mass of V2O5; in the aluminothermic reduction smelting, a magnesium rod is used for igniting furnace charge to carry out aluminothermic reaction; and after the reaction is finished, cooling to room temperature to obtain the ferrovanadium alloy. The method can effectively simplify the process flow, reduce the production cost, improve the product quality, and solve the technical problems of tedious steps and high cost of the traditional process.

The invention discloses a titanium white waste acid treatment process, and relates to the technical field of industrial waste regeneration. The titanium white waste acid is subjected to microfiltration and membrane electrolysis treatment, sulfuric acid is separated and recycled under the control of constant pressure and constant current, and residual liquid is subjected to electrodialysis treatment to oxidize ferrous ions into ferric hydroxide precipitates and calcined into ferric oxide; carrying out reduction leaching on the titanium-containing material, hydrolyzing to generate metatitanic acid, and calcining to obtain titanium dioxide; oxidizing the hydrolysate to precipitate vanadate, and calcining to obtain vanadium pentoxide; adjusting the pH value of the filtrate, selectively adsorbing scandium through a biological adsorption column, precipitating and calcining the eluent to obtain scandium oxide, and regenerating and recycling the adsorbent through acid pickling. According to the process, through multi-stage treatment and biological adsorption, resource recycling of sulfuric acid, iron, titanium, vanadium and scandium components in the waste acid is achieved, the process is clean and efficient, secondary pollution of a traditional process is avoided, and a green low-carbon solution is provided for waste acid treatment in the titanium dioxide industry.

The invention discloses a preparation method and application of a vanadium-doped titanium dioxide composite material, and relates to the technical field of titanium dioxide composites.The preparation method comprises the following steps that 1, ammonium vanadate and titanium dioxide are mixed in proportion, the doping amount of the vanadium element is controlled to range from 0.1 wt% to 12.5 wt% according to the total mass of the mixture, then high-temperature heating is conducted, and a mixture is obtained; vanadium-doped titanium dioxide powder is obtained; and (2) mixing the vanadium-doped titanium dioxide powder with a carrier in proportion, controlling the content of the vanadium-doped titanium dioxide powder to be 10-30 wt% based on the total mass of the composite material, and carrying out physical grinding to obtain the powdery vanadium-doped titanium dioxide composite material. The catalytic material disclosed by the invention is applied to degradation of sulfur hexafluoride and has excellent degradation capability.

The invention belongs to the technical field of all-vanadium redox flow batteries, and relates to a preparation method of a vanadium electrolyte and solid vanadyl sulfate, and the preparation method of the vanadium electrolyte comprises the following steps: based on pH value adjustment in a vanadium molybdate solution and a reverse extraction reagent, realizing co-extraction of vanadium and molybdenum elements in the vanadium molybdate solution by extracting an organic phase and sequential reverse extraction and recovery of the molybdenum and vanadium elements, the extraction organic phases for extracting vanadium and molybdenum elements have the same composition; and purifying the recovered vanadium product to prepare the vanadium electrolyte. The problems that in the prior art, synchronous recovery of various vanadium and molybdenum elements is difficult to achieve, the vanadium element is difficult to recycle, the vanadium recovery rate is low, the purity of recovered products is low, environmental pollution is large, the requirement for the purity of vanadium raw materials is high, the steps of a vanadium raw material purification preparation process are complex, and vanadium is difficult to separate from vanadium and molybdenum homologous materials are solved. The method overcomes the defects of low yield and low product purity caused by poor separation effect of elements in the vanadium molybdate solution in the prior art.

This invention relates to the field of nanomaterials technology, and discloses a vanadate composite material, its preparation method, and its application. A reaction solution containing a surfactant is prepared to generate bubbles. These bubbles then act as soft templates under rapid stirring and heating. Vanadium oxide is dispersed in this reaction solution and reacted at a specific temperature for a certain time, allowing the surfactant to intercalate the vanadium oxide, transforming it into vanadate. The surfactant then coats the outer surface of the vanadate, resulting in an in-situ surface-modified vanadate composite material. The surfactant layer of this composite material can regulate the reaction layer between the electrode surface and the electrolyte, preventing electrode material dissolution or structural collapse during the electrochemical reaction process, thus significantly improving the performance of electrochemical energy storage devices. The foaming effect of the surfactant ensures that the bubbles are uniformly dispersed in the liquid, acting as soft templates for the attachment and growth of vanadate crystals.

The application provides a method for preparing vanadium electrolyte by crystallizing vanadium slag with bayer seed mother liquor, which comprises the following steps: reducing and acid leaching the bayer seed mother liquor crystallized vanadium slag, converting V(V) and As(V) into V(IV) and As(III), adding arsenic removal precipitator to remove arsenic, and further hydrolyzing VO(OH)2; converting the VO(OH)2 into pentavalent vanadate solution through oxidation and alkali leaching, and further removing impurity ions such as arsenic, phosphorus, aluminum and silicon through multiple crystallization to obtain high-purity vanadate; finally, converting the high-purity vanadate into V(IV) solution through reduction and acid leaching, adding arsenic removal precipitator again to realize deep arsenic removal, hydrolyzing to obtain VO(OH)2, and preparing VOSO4 electrolyte through sulfuric acid acid solution.

The present invention relates to a method for preparing a metal single-atom catalyst supported on vanadium nitride. In this method, an ammonium metavanadate solution is dropped into a mixed solution containing zinc nitrate and a second metal source, and a metal-doped zinc vanadate precursor is synthesized by chemical precipitation. Subsequently, in an ammonia atmosphere, the metal-doped zinc vanadate precursor is subjected to high-temperature nitridation to prepare the metal single-atom catalyst supported on vanadium nitride. The metal single-atom loading in the metal single-atom catalyst supported on vanadium nitride is 0.01 to 4.5 wt%. The synthesis method of the present invention only requires two steps and is applicable to various metals. The synthesized metal single-atom catalyst supported on vanadium nitride can be used in the catalytic field.