136results about "Vanadium compounds" patented technology

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.

This application provides a KVOH nanomaterial, its preparation method, and an aqueous zinc-ion battery to address the technical problem of low performance of vanadium pentoxide cathode materials in the prior art. The KVOH nanomaterial provided in this application is obtained by a solvothermal reaction in an aqueous ethylene glycol solution. The introduction of potassium ions in the reaction expands the ion transport channels between the electrode material layers, improving the cycle performance of the battery. At the same time, the introduction of tetravalent vanadium also increases the specific capacity of the battery, thereby solving the technical problem of low performance of vanadium pentoxide cathode materials in the prior art.

The invention discloses a bismuth-based nanofiber photocatalytic material as well as a preparation method and application thereof, and belongs to the technical field of photocatalytic materials. The material is prepared by taking bismuth as a matrix and introducing vanadium, halogen or molybdenum elements through an electrostatic spinning and staged calcining process. The obtained material is of a three-dimensional nanofiber membrane structure, has a high specific surface area and excellent visible light response characteristics, can synchronously and efficiently photocatalytically degrade organic pollutants in electroplating wastewater and reduce and fix heavy metal ions, is easy to separate and recover, has good cycle stability, and is suitable for industrial production. And an efficient and green technical scheme is provided for deep treatment of the electroplating wastewater.

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 invention belongs to the field of magnesium ion battery positive electrode materials, and particularly relates to a preparation method of a magnesium ion battery positive electrode material BixVS4 composite material, which comprises the following steps: dissolving an organic reducing agent in N-methyl pyrrolidone, and stirring at room temperature; adding ammonium metavanadate, and stirring at 50-100 DEG C; adding thioacetamide, and continuously stirring; adding hydrochloric acid and stirring until the color of the solution becomes dark green; and adding bismuth nitrate pentahydrate, stirring, carrying out a hydrothermal reaction in a reaction kettle, cooling to room temperature, centrifuging, washing with deionized water and absolute ethyl alcohol for several times, and drying to obtain the BixVS4 composite material. The method has the advantages that VS4 is subjected to cation modification, high conductivity is provided by introduction of metal ions, and charge transfer is accelerated. Bi enters a VS4 crystal lattice, local charge rearrangement is caused, Van der Waals force between VS4 layers is weakened, rapid embedding and de-embedding of Mg < 2 + > are facilitated, and more active sites for embedding of Mg < 2 + > are provided.

The invention discloses a preparation method and application of a vanadium tetrasulfide (V3S4) nanosheet embedded nitrogen and sulfur co-doped carbon fiber composite material. The preparation method comprises the following steps: firstly, preparing vanadyl acetylacetonate, sublimed sulfur, polyacrylonitrile (PAN), polypyrrole (PPy) and N, N-dimethylformamide (DMF) into a mixed solution according to a certain proportion, and preparing a vanadium precursor fiber film through electrostatic spinning; and then carrying out pre-oxidation and high-temperature calcination vulcanization processes to convert the fiber film into vanadium tetrasulfide nanosheets and nitrogen-sulfur co-doped carbon fibers in situ. In the process, PAN and PPy are subjected to high-temperature carbonization to form the nitrogen and sulfur co-doped carbon fiber. By adding PPy, the morphology of the carbon fiber is further adjusted, and a vanadium precursor is promoted to be converted into a carbon-coated vanadium tetrasulfide nanosheet to be separated out from the interior of the fiber. The vanadium tetrasulfide nanosheet embedded nitrogen-sulfur co-doped carbon fiber composite material obtained by the invention has the advantages of low raw material cost, good repeatability and good ion diffusion and electron transmission capabilities, and shows high reversible capacity, good rate capability and excellent cycle stability when being used as a lithium ion battery negative electrode material.

The invention provides a high-purity and high-solubility vanadyl sulfate crystal and a preparation method and application thereof.The preparation method of the high-purity and high-solubility vanadyl sulfate crystal comprises the following steps that ammonium metavanadate or ammonium polyvanadate serves as a raw material and is roasted at the temperature of 600-900 DEG C under the inert gas protection and reducing atmosphere conditions, and vanadium oxide is obtained; dissolving the vanadyl sulfate in a mixed solution of pure water and sulfuric acid to obtain a high-concentration vanadyl sulfate solution or vanadyl sulfate slurry; the valence state of vanadium is adjusted to 3.9-4.1; cooling, crystallizing and filtering to obtain primary vanadyl sulfate crystals; dissolving the primary vanadyl sulfate crystal in pure water to obtain a vanadyl sulfate solution, and filtering; and adding sulfuric acid, adjusting the vanadium valence state of the solution to 3.99-4.01, cooling, crystallizing, and filtering to obtain the high-purity and high-solubility vanadyl sulfate crystal. The vanadyl sulfate crystal has the advantages of small particle size, high purity, good solubility and the like, and has good application prospects and large-scale popularization potential in the field of vanadium electrolyte.

The invention belongs to the technical field of energy storage batteries, and particularly relates to a method for preparing a vanadium oxide electrolyte based on a sodium vanadium oxide solution and a vanadium redox flow battery. The method comprises the following steps: S1, sodium treatment leaching: treating a vanadium-containing raw material by adopting a sodium-containing compound to generate a sodium vanadium solution; s2, valence state regulation and control: dividing the sodium vanadium solution into two parts, adjusting the pH value of the first part to be acidic, and then adding a reducing agent to carry out a reduction reaction to obtain a negative electrode electrolyte containing V < 3 + > / V < 4 + >; and adding an oxidizing agent into the second part for oxidation reaction to obtain the positive electrode electrolyte containing V < 4 + > / V < 5 + >. According to the method, the vanadium slag is used for replacing high-purity V2O5 to prepare the electrolyte, so that the cost of raw materials is reduced; according to the electrolyte prepared by the invention, the energy efficiency of the battery is high; meanwhile, the preparation method disclosed by the invention adopts an integrated process, and an intermediate product treatment link is omitted, so that the preparation steps are simpler, and the production efficiency is remarkably improved.

The invention discloses an ultralow-carbon unfired magnesia carbon brick for a stainless steel AOD converter. The ultralow-carbon unfired magnesia carbon brick comprises the following raw materials in parts by weight: 95-98 parts of dicalcium fused magnesite, 1-3 parts of graphite, 1-3 parts of resin, 1-3 parts of a metal additive, 3-5 parts of an antioxidant, 1-2 parts of titanium, 1-2 parts of chromium and 1-2 parts of zirconium. Wherein the antioxidant is a mixture of modified nano vanadium pentoxide and rare earth oxide. The invention aims to solve the technical problem of poor oxidation resistance of magnesia carbon bricks.

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 invention relates to the field of batteries, and discloses a flaky NH4V3O8 electrode material and a preparation method thereof, and the method comprises the following steps: S1, mixing a vanadium-containing solution and an ammonium salt to obtain a mixed solution; s2, adjusting the pH value of the mixed solution to 4-6, and carrying out precipitation reaction under the condition of 20-85 DEG C to obtain slurry; and S3, adding a morphology regulator into the slurry, carrying out a reaction at a temperature of 90-100 DEG C to obtain a reacted material, and carrying out post-treatment on the reacted material to obtain the flaky NH4V3O8 electrode material. According to the preparation method, the flaky NH4V3O8 electrode material with high purity and excellent electrochemical performance can be prepared.

The invention discloses a preparation method of ammonium polyvanadate and the ammonium polyvanadate. The method comprises the following steps: carrying out calcium salt roasting and acid leaching on the vanadium slag to obtain a calcified acid leaching vanadium solution; removing lead from the calcified vanadium acid leaching solution to obtain a purified solution; adjusting the pH value of the purified liquid and adding ammonium sulfate; heating, introducing compressed air and ozone, and stirring; and after the compressed air and the ozone are introduced into a preset volume, stopping heating, stirring and standing to obtain ammonium polyvanadate. According to the scheme provided by the invention, ozonation is adopted, so that the vanadium precipitation yield after lead removal can be improved, meanwhile, the subsequent vanadium product quality is not influenced, other impurities are not introduced after oxidation is completed, the vanadium oxide wastewater circulation is not influenced, and the cost of the oxidation process is low.

The application discloses a kind of green treatment recycling methods of vanadium precipitation wastewater, belong to chemical industry.Green treatment recycling methods of vanadium precipitation wastewater include the following steps: removing metal impurity ions from sodium vanadium extraction vanadium precipitation wastewater, then adding calcium oxide and passing compressed air to remove ammonia, ammonia gas generated by ammonia removal is absorbed to obtain ammonium sulfate solution, calcium sulfate is calcined to generate calcium oxide and sulfur dioxide, and further prepared sulfuric acid, after ammonia removal, the wastewater is passed into carbon dioxide to generate sodium bicarbonate, evaporation concentration is obtained sodium bicarbonate solid and condensate, and the residual concentrated slurry returns evaporation concentration process.In the process flow, the generated sodium bicarbonate returns the roasting process, the condensate returns the leaching process, the ammonium sulfate solution returns the vanadium precipitation process, and the calcium oxide returns the ammonia removal process.The green treatment recycling method of vanadium precipitation wastewater has the advantages of low cost, convenient operation, resource recycling, etc., and realizes the green treatment of vanadium precipitation wastewater.

The invention discloses a Bayer process sodium aluminate solution comprehensive purification system and a Bayer process sodium aluminate solution comprehensive purification process wherein in an inorganic carnallite purification system, high-concentration forced-effect mother liquor is adopted for seed crystal salting-out, settling separation and filter pressing to obtain a primary purification filtrate; according to the organic matter crystallization, adsorption and purification system, after primary purification filtrate and low-concentration evaporation mother liquor are mixed and cooled, underflow of an organic matter settling tank serves as seed crystal, an adsorption auxiliary is added, and through the combined action of natural cooling precipitation and adsorption, the morphology of a crystallization product is controlled, and the settling and filtering performance is improved. And the vanadium salt purification system is used for further cooling and crystallizing the secondarily purified filtrate and extracting the vanadium element. The comprehensive purification system can perform step-by-step multiple purification on the Bayer process sodium aluminate solution, the influence of various impurities on the production system is reduced, the step-by-step purification can further solve the problem of difficult product treatment and purification, the recovery and extraction of the high-value vanadium-rich salt slag and the preparation of ammonium metavanadate are realized, and the method is suitable for industrial production. Meanwhile, various purified impurities are subjected to innocent treatment.

The application belongs to the technical field of wet vanadium extraction, and particularly relates to large-granularity ammonium metavanadate and a preparation method thereof. The preparation method comprises the following steps: (1) preparation of a vanadium-containing stock solution; (2) dissolving ammonium salt and high-molecular-weight polyethylene glycol in water, and adding alkali to adjust pH to obtain an ammonium salt solution; (3) adding low-molecular-weight polyethylene glycol to the vanadium-containing stock solution to obtain a modified vanadium-containing stock solution; (4) uniformly mixing the ammonium salt solution and the modified vanadium-containing stock solution, adjusting pH, and obtaining a mixture after reaction; and (5) filtering the mixture, washing the solid product, and obtaining large-granularity ammonium metavanadate. The low-molecular-weight polyethylene glycol mainly plays a role in reducing nucleation rate, and the high-molecular-weight polyethylene glycol has good adsorption and mainly plays a role in promoting crystal growth, so that the granularity of ammonium metavanadate is improved through the cooperation of polyethylene glycols with different molecular weights. The application has simple process, is environment-friendly, has no waste water and waste residue to be discharged, and is beneficial to industrial popularization and application.

The invention discloses a metal-doped VOOH nano-enzyme material with a hollow spherical shell structure as well as a preparation method and application of the metal-doped VOOH nano-enzyme material, and belongs to the technical field of nano-materials and biological catalysis. The invention aims to solve the problems that the peroxidase-like activity of the existing pure-phase VOOH nano material is relatively limited, the electronic structure of the pure-phase VOOH nano material is not in the optimal state of catalyzing H2O2 decomposition, and the adsorption / desorption energy barrier of a reaction intermediate is relatively high. The chemical general formula of the metal-doped VOOH nano-enzyme material with the hollow spherical shell structure is M-VOOH, and M is a doped metal element. The preparation method comprises the following steps: 1, dissolving a precursor; 2, acidity adjustment; 3, doping metal; and 4, reduction and crystallization. According to the application, the catalyst serves as a peroxidase-like catalyst to catalyze decomposition of hydrogen peroxide.

This invention belongs to the field of inorganic non-metallic material preparation technology, and discloses a method for preparing BiCa2VO6 material with a rod-like structure in a short time. Using CaCO3, Bi(NO3)3, and V2O5 as raw materials, NaCl and KCl are mixed and ground with the above raw materials as a mixed molten salt to obtain a precursor. The precursor is heat-treated at 700-850ºC for 20 min-3 h, and after natural cooling, a BiCa2VO6-salt mixture is obtained. The mixture is washed multiple times with deionized water to remove the salt components, filtered, and dried to obtain the BiCa2VO6 material. The preparation time of the BiCa2VO6 material in this invention is short and energy consumption is low. The obtained material has a significant rod-like structure with a diameter of 0.7-8 μm and a length of 6-56 μm. The preparation conditions of this method are simple and controllable, the operation process is convenient, and it is easy to achieve large-scale production.

Provided is a powder comprising a negative thermal expansion material including a compound represented by general formula (1): Znx1Tx2Py1Ay2Oz (T includes at least one element selected from among Li, Mg, Al, Si, Ca, Sr, Ba, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Ga, Ge, Zr, Nb, Mo, Ag, In, Sn, Sb, La, Ce, Ta, W, Bi, B, Na, K, F, Cl, Br, I, Hf, Y, Yb, S, Mo, Te, Pb, Cd, Te, Nd, Sm, Eu, Tb, Dy, and Ho, A includes at least one element selected from among Li, Ca, Sr, Ba, Al, Si, V, Ge, Sn, La, Ce, Y, Pr, Nd, and Sm, 0 ≤ x2 < 2, 0 ≤ y2 ≤ 2, 1.7 ≤ x1 + x2 ≤ 2.3, 1.7 ≤ y1 + y2 ≤ 2.3, and 6 ≤ z ≤ 8). The powder has a 90% volume-frequency particle diameter (D90) of 50 μm or less.

This provides a new material that exhibits negative thermal expansion. [Solution] The negative thermal expansion material is Ti (3) 2-x M x O3(M contains at least one element selected from Mg, Al, Si, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Zr, Nb, Mo, Ag, In, Sn, Sb, La, Ta, W, Bi, 0

Novel compounds having a sortovite-related structure are disclosed. The compounds may be colored and are useful as pigments. The compounds are durable in terms of acid stability tests, which show that the pigments do not substantially discolor when exposed to weak acids such as rain. The compounds disclosed herein are typically inexpensive to synthesize from earth-abundant, environmentally friendly elements or minerals, and therefore offer advantages over existing pigments in the art.

The invention discloses a synthesis method and application of a layered NH4V4O10 adsorbing material for selectively adsorbing 228Ra and 224Ra. LiOH is used as a mineralizing agent, and layered NH4V4O10 is prepared through a hydrothermal synthesis method; the NH4V4O10 adsorbent with a layered structure is obtained through material design and screening, the interlayer spacing of the NH4V4O10 adsorbent reaches the angstrom level, and the NH4V4O10 adsorbent can show excellent selectivity to Ra (II) in a Th (IV) / Ra (II) binary medium through the ion size recognition effect.

A method of preparing bismuth vanadate particles is described. The bismuth vanadate particles prepared via ultrasonication and hydrothermal treatment exhibit controlled morphology (e.g., octahedral shape) and crystallinity (e.g., tetragonal crystal symmetry). A photoelectrode containing bismuth vanadate particles and a method of using the photoelectrode in a photoelectrochemical cell for water splitting is also provided.

Disclosed is a positive electrode active material for a lithium-ion battery, wherein the positive electrode active material has small volume changes during charging and discharging, and when applied to a battery, can improve the cycle characteristics of the battery. The positive electrode active material of the present disclosure has a disordered rock salt structure belonging to space group Fm-3m, and has a composition represented by Li1+xTiyVzO2 (where 0<x≤0.20, 0<y≤0.40, and 0.40≤z≤0.85).

The application relates to the technical field of water-based zinc ion battery positive electrode materials, in particular to an ammonium vanadate positive electrode material and a preparation method and application thereof. The application provides a preparation method of an ammonium vanadate positive electrode material, which comprises the following steps: mixing an ammonium metavanadate solution and gas-phase grown carbon fibers, then adding cyclodextrin and anhydrous oxalic acid in sequence, carrying out a hydrothermal reaction, and obtaining the ammonium vanadate positive electrode material. The ammonium vanadate positive electrode material prepared by the method has excellent cycle stability and rate performance.

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 a copper vanadium composite oxide represented by the following general formula (1): CuxCayVzOt. In the general formula (1), 0<x<2.50, 0<y<2.00, 1.70≤z≤2.30, 6.00≤t≤9.00, and 1.00≤x+y≤3.00.

A vanadium oxide composite of the present disclosure includes: a particle including a vanadium oxide represented by a composition formula (1) Li3+x+aV1−xMxO4+a / 2, and an electrically conductive material at least partially coating a surface of the particle. In the composition formula (1), 0<a<1 and 0≤x<1 are satisfied, and M is at least one element selected from the group consisting of a tetravalent metal element and a tetravalent metalloid element. The vanadium oxide composite has an average particle size of 0.5 μm or more and 5.0 μm or less.

The present application relates to the field of vanadium battery, and discloses a method for directly preparing vanadium battery electrolyte from vanadium solution without organic participation, comprising: adjusting the pH of the vanadium solution to 2-3, and adding inorganic reducing agent to convert V(V) in the vanadium solution into V(IV), to obtain pretreated vanadium solution; separating Fe impurities and Al impurities in the pretreated vanadium solution in the form of precipitation, and adsorbing Ti impurities in the pretreated vanadium solution by adsorbent, to obtain impurity-removed vanadium solution containing V(IV); performing electrodialysis treatment on the impurity-removed vanadium solution to concentrate the solution and remove alkali metal impurities in the solution, to obtain post-electrodialysis solution; performing electrolysis and blending on the post-electrodialysis solution, to obtain electrolyte with predetermined acid radical concentration and predetermined vanadium concentration, and V(III) / V(IV)=1:(0.95-1.05). The present application can shorten the process flow and avoid environmental pollution caused by the use of organic matter on the basis of ensuring the performance of the electrolyte.

The utility model discloses a device for preparing ammonium polyvanadate by continuously crystallizing a sodium vanadate solution. The device comprises a premixing tank, a liquid storage tank, a reaction kettle and a filter press, the premixing tank is provided with a sodium vanadate solution inlet, an ammonium sulfate inlet and a sulfuric acid inlet, an outlet of the premixing tank is communicated with an inlet of the liquid storage tank, an outlet of the liquid storage tank is communicated with an inlet of the reaction kettle, and an outlet of the reaction kettle is communicated with an inlet of the filter press; the reaction kettle is provided with a heating structure and a sulfuric acid inlet. According to the device, the pre-mixing tank is independently arranged, the process in the pre-mixing tank is controlled in the use process, so that no crystal precipitate is generated in the pre-mixed vanadium liquid, and the crystallization process is performed in the reaction kettle through the transition of the liquid storage tank, so that the stability of the ammonium polyvanadate crystallization process can be improved, and the particle size of the ammonium polyvanadate can be increased to reduce the cleaning difficulty; the stability and purity of the ammonium polyvanadate in the crystallization process are improved, and meanwhile the particle size of the ammonium polyvanadate is increased.

What is provided are a proton-conducting solid electrolyte which can exhibit high proton conductivity and stability in a low-temperature range and a medium-temperature range, an electrolyte layer formed of the proton-conducting solid electrolyte, and a battery. As an example, a proton-conducting solid electrolyte represented by a general formula: Ba1-αSc1-xMoxO3-δHy, in which α is −0.2 to 0.2, x is 0.1 to 0.3, y is 0 to 1-3x, and δ is 0 to ½-3x / 2, a proton-conducting solid electrolyte represented by a general formula: BaSc1-xMoxO3-δHy, in which x is 0.15 to 0.25, y is 0 to 1-3x, and δ is 0 to ½-3x / 2, or the like; an electrolyte layer, and a battery are provided.

The application discloses a preparation method and application of a phenolphthalein intercalated ammonium vanadate material. The phenolphthalein intercalated ammonium vanadate material is synthesized by a one-step solvothermal method, ammonium metavanadate is used as a vanadium source, a mixed solution of ethylene glycol and water is used as a reaction medium, and oxalic acid is used as a reducing agent, so that the phenolphthalein intercalated ammonium vanadate material is obtained under a solvothermal condition. The phenolphthalein molecules between layers of the material play a role of a support, and the hydrophobic phenolphthalein molecules can reduce direct contact between the material and water molecules, inhibit structural collapse and dissolution of the material in a cycle process and the like, and the material is applied to a water-based zinc ion battery as a positive electrode material, so that more excellent electrochemical performance and cycle stability are obtained.