30 results about "Vanadyl acetylacetonate" patented technology

The invention relates to a temperature characteristic controllable multilayer ceramic dielectric capacitor and a preparation method thereof, the multilayer ceramic dielectric capacitor is formed by a dielectric layer A and a dielectric layer B through mutual staggered superposition and firing, the dielectric layer A is composed of barium titanate, magnesium oxide, manganous-manganic oxide, vanadyl acetylacetonate, rare earth oxide A, rare earth oxide B, silicon dioxide, calcium carbonate and zirconium oxide, and the dielectric layer B is composed of barium titanate, magnesium oxide, manganous-manganic oxide, vanadyl acetylacetonate, rare earth oxide A, rare earth oxide B, silicon dioxide, calcium carbonate and zirconium oxide; the dielectric layer B is composed of barium titanate, magnesium oxide, manganous-manganic oxide, vanadyl acetylacetonate, rare earth oxide C, rare earth oxide D, silicon dioxide, calcium carbonate, zirconium oxide and nickel oxide; the multilayer ceramic dielectric capacitor is formed by the dielectric layers A and the dielectric layers B in a staggered and stacked mode through firing, the combination of the double dielectric layers is different from a traditional single dielectric layer, and the capacitor has the advantages of being high in dielectric constant and high in temperature stability at the same time.

The present invention discloses a CMO / SO / BVO photoanode and a preparation method and application thereof, and relates to the field of photoelectrochemical technology. The method comprises the following steps in sequence: electrodepositing a BiOI film on a substrate material, and then dripping a dimethyl sulfoxide solution containing vanadium acetylacetonate to obtain a BVO electrode; placing in a NaOH solution containing tetraethyl orthosilicate to obtain a SO / BVO electrode; placing in a CoMoO4 precursor solution, hydrothermally reacting, calcining, and obtaining a CMO / SO / BVO photoanode. The CMO / SO / BVO of the present invention exhibits superior photocurrent and charge separation efficiency compared to the CMO / BVO photoanode under 1.23V vs.RHE conditions. The present invention solves the problem of poor photoelectrochemical performance of the photoanode in the prior art.

The invention belongs to the field of semiconductor bridge current protection, and particularly relates to a semiconductor bridge current protection method based on a vanadium dioxide thick film thermistor. Firstly, copper, nickel and gold interdigital electrodes are deposited and grown on an aluminum oxide ceramic substrate, then a methanol solution of vanadyl acetylacetonate is sprayed on the surface of the heated interdigital electrode, a vanadium dioxide thermistor device is obtained, the vanadium dioxide thermistor device is connected with a semiconductor bridge in parallel, and current protection of the semiconductor bridge thermistor is achieved. Vanadium dioxide with a single valence state can be synthesized by adjusting the synthesis method and process, M-phase vanadium dioxide is synthesized on the interdigital electrode in one step, the vanadium dioxide prepared by the method avoids the tedious process that vanadium dioxide powder is firstly prepared and then transplanted to the surface of the interdigital electrode, and the preparation method is simple and convenient to operate. And the vanadium dioxide can be more stably combined on the surface of the interdigital electrode.

The invention relates to the technical field of metal material hot working, and discloses a hot-rolled coiled plate production process which comprises the following steps: preparing a reaction type protective agent, the high-temperature-resistant coating is prepared from the following raw materials in parts by weight: 20 to 40 parts of tetraethoxysilane, 5 to 15 parts of triethyl phosphate, 1 to 5 parts of triethyl borate, 0.5 to 2.0 parts of cerous nitrate (III) hexahydrate, 0.1 to 1.0 part of lithium acetate and 0.01 to 0.05 part of vanadyl acetylacetonate (IV). Coating the surface of a hot-rolled plate blank with the protective agent; the coated plate blank is heated in a heating furnace, so that the protective agent forms a molten-state protective layer in situ; carrying out hot rolling on the plate blank with the molten protective layer; and cooling and coiling the hot-rolled steel strip. In the whole heating and hot rolling process, the molten protective layer isolates the contact between the steel and the oxidizing atmosphere, so that the generation of oxide scales is fundamentally inhibited, the production process is simplified, and the metal yield is increased.

The invention relates to a preparation method of an oxygen vacancy-rich bismuth molybdate / bismuth vanadate composite photo-anode and a product and application thereof, and belongs to the technical field of photoelectrocatalysis. The invention discloses a preparation method of an oxygen vacancy-rich bismuth molybdate / bismuth vanadate (Bi2Mo2O9 / BiVO4) composite photo-anode, which mainly comprises the following steps: immersing a fluorine ion-doped tin dioxide (FTO) conductive glass substrate into a Bi < 3 + > ion solution and an I <-> ion solution to form a bismuth oxyiodide (BiOI) film, dropwise adding a dimethyl sulfoxide solution of vanadyl acetylacetonate (VO (acac) 2), and putting into a muffle furnace to prepare the BiVO4 photo-anode. And then vertically immersing into a Bi < 3 + > ion solution and a Mo < 6 + > ion solution, and carrying out annealing treatment in an argon atmosphere to prepare the Bi2Mo2O9 / BiVO4 composite photoanode rich in oxygen vacancies. The Bi2Mo2O9 / BiVO4 material rich in oxygen vacancies is a metal oxide composite photo-anode, the photoelectrocatalysis efficiency can be improved, and hydrogen peroxide (H2O2) can be continuously generated in natural seawater through photoelectrocatalytic oxidation of water for a long time.

The invention provides a BiVO4 / CuS / NiFeCoOx photoelectrocatalysis material as well as a preparation method and application thereof, and relates to the technical field of photoelectrocatalysis. The preparation method of the photoelectrocatalytic material comprises the following steps: electrically depositing a BiOI film on the surface of a substrate, dropwise adding a vanadyl acetylacetonate solution on the surface of the substrate, and sequentially carrying out high-temperature calcination and alkali liquor soaking to obtain a BiVO4 substrate layer; coating the surface of the substrate layer with a chloroform solution of copper sulfide to obtain a BiVO4 / CuS composite material; and performing first-stage soaking in an iron-nickel-cobalt solution with the pH value of 4.5-5.5, adjusting the pH value of the solution to 6-8, and performing second-stage soaking, thereby finally obtaining the BiVO4 / CuS / NiFeCoOx photoelectric catalytic material. The material has good photoelectrocatalytic activity and stability.

The present invention relates to the technical field of aerogel fibers, and more specifically, to a heat-generating and heat-insulating nano-aerogel fiber and a method for preparing the same, comprising the following components: a composite aerogel, a modified wool fiber, and a phase change material. The addition of borides can absorb infrared radiation and convert it into heat energy, thereby improving the heating efficiency of the fiber; borides can also enhance the infrared emission capability of the fiber itself. When the fiber temperature rises, it can better dissipate heat in the form of infrared radiation, maintaining a warm environment around it. Vanadyl acetylacetonate can enhance the structural stability of the aerogel through synergistic effects with other materials, allowing it to maintain good mechanical properties under multiple cycles of compression, torsion, and other loads.

The invention relates to the technical field of aerogel fibers, in particular to a heating and warm-keeping nano aerogel fiber and a preparation method thereof, and the heating and warm-keeping nano aerogel fiber comprises the following components: composite aerogel, modified wool fiber and a phase change material. The added boride can absorb infrared radiation and convert the infrared radiation into heat energy, so that the heating efficiency of the fiber is improved; the boride can also enhance the infrared emission capability of the fibers, and when the temperature of the fibers rises, heat can be better dissipated in an infrared radiation mode, and the surrounding warm environment is maintained. The vanadyl acetylacetonate can enhance the structural stability of the aerogel through the synergistic effect with other materials, so that the aerogel can still keep good mechanical properties under loads such as multiple cyclic compression and distortion.

The application discloses a temperature characteristic controllable multilayer porcelain dielectric capacitor and a preparation method thereof. The multilayer porcelain dielectric capacitor is prepared by stacking and firing dielectric layer A and dielectric layer B in a staggered mode, wherein the dielectric layer A is composed of barium titanate, magnesium oxide, trimanganese tetroxide, vanadyl acetylacetonate, rare earth oxide A, rare earth oxide B, silicon dioxide, calcium carbonate and zirconium oxide; the dielectric layer B is composed of barium titanate, magnesium oxide, trimanganese tetroxide, vanadyl acetylacetonate, rare earth oxide C, rare earth oxide D, silicon dioxide, calcium carbonate, zirconium oxide and nickel oxide; the multilayer porcelain dielectric capacitor defined in the application is prepared by stacking and firing the dielectric layer A and the dielectric layer B in a staggered mode, and the double dielectric layer combination is different from a traditional single dielectric layer, so that the capacitor simultaneously has the advantages of high dielectric constant and high temperature stability.

A method for preparing vanadium trioxide / carbon supercapacitor electrode material belongs to the field of electrochemical energy storage, using vanadium acetylacetonate and glucose as raw materials, and preparing V 2 O 3 / C composite material, which is used as the electrode of supercapacitor with Na 2 SO 4 The aqueous solution is used as the electrolyte to assemble into a symmetrical aqueous supercapacitor. The raw material price of the invention is cheap and the preparation process is simple; V 2 O 3 The hollow nanospheres not only have a wide voltage window of ‑1.1~1.3 V (vs. Ag / AgCl), but also have a specific capacitance of 708.6 F g ‑1 ; V 2 O 3 / C hollow nanospheres as electrodes, Na 2 SO 4 The aqueous solution is used as the electrolyte, and the prepared symmetric supercapacitor has an operating voltage of up to 2.4 V and an ultra-high energy density of 96.8 W h kg ‑1 And excellent cycle stability.

A method for coating a substrate with a Co-Pi modified BiVO4 / WO3 heterostructure film includes direct current reactive sputtering tungsten (W) onto a substrate in a gaseous mixture containing oxygen to form a tungsten trioxide (WO3) film, direct current reactive sputtering bismuth (Bi) onto the tungsten trioxide (WO3) film in a gaseous mixture containing oxygen to form a dibismuth trioxide (Bi2O3) film, drop-casting a vanadyl acetylacetonate solution onto the Bi2O3 film and heating at a temperature of at least 450° C. in ambient air to convert the Bi2O3 film to a BiVO4 film, and photoelectrochemically coating the BiVO4 film with a cobalt-phosphate (Co-Pi) to form a modified film on the surface of the substrate. A photoanode containing the Co-Pi modified BiVO4 / WO3 heterostructure film prepared by the method, and its application in water splitting.

The invention discloses a synthetic method of a cytochalasin compound curtalasin B. The synthetic method comprises the following steps: reacting a compound 22 with dimethyl ketone peroxide in a solvent at the temperature of-35 to-20 DEG C to generate a compound 23; reacting the compound 23 with boron trifluoride diethyl etherate in a solvent at-78 to 5 DEG C to obtain a compound 24; reacting the compound 24 with vanadyl acetylacetonate and tert-butyl hydroperoxide in a solvent at 15-35 DEG C to obtain a compound 25; dissolving the compound 25 in toluene, adding tri-pentafluorophenyl boron at room temperature, heating to 80 DEG C, and reacting to obtain a compound 26; and dissolving the compound 26 in absolute methanol, adding anhydrous potassium carbonate at 0-35 DEG C, and reacting at room temperature to obtain the curtalasin B. The invention further discloses a preparation method of the curtalasin B. The method is simple to operate, simple in post-treatment, low in product separation and purification cost and high in synthesis efficiency; most of the used reagents are commercially obtained, are low in price and do not need special treatment.

The application discloses a composite photoelectrode for glucose content detection and a preparation method and application thereof, and belongs to the technical field of photoelectrochemical analysis. A BiOI film is electrochemically deposited on the surface of a conductive substrate (such as pretreated FTO conductive glass) in a nitric acid solution system; a bismuth vanadate photoelectrode is obtained by calcining and alkali treatment of the substrate on which dimethyl sulfoxide solution containing vanadyl acetylacetonate is dropped; a polyterthiophene (pTTH) layer is photoelectrodeposited on the surface of the bismuth vanadate by using acetonitrile electrolyte; a multistage composite structure is obtained by depositing a nickel oxide layer through an aqueous electrolyte and calcining treatment, so that the nickel oxide / polyterthiophene / bismuth vanadate composite photoelectrode is obtained. In this way, the nickel oxide / polyterthiophene / bismuth vanadate composite photoelectrode prepared by the application has high carrier separation efficiency and excellent catalytic stability, and provides an analysis method with simple steps for effective voltage detection of glucose.

The present invention discloses a bismuth vanadate / titanium dioxide / cobalt phosphate photoanode and a preparation method thereof. The method firstly spin-coats a mixed solution of bismuth nitrate pentahydrate and vanadyl acetylacetonate on an FTO substrate, and anneals to obtain a BiVO4 photoanode; then, a TiO2 film is deposited on the surface of the BiVO4 photoanode by electrophoretic deposition to obtain a BiVO4 / TiO2 photoanode; finally, a Co‑Pi co-catalyst layer is deposited on the surface of the BiVO4 / TiO2 photoanode by electrophoretic deposition to obtain a BiVO4 / TiO2 / Co‑Pi photoanode. The BiVO4 / TiO2 / Co‑Pi photoanode of the present invention has excellent stability and exhibits a good service life. It also has a high carrier transport capacity and good photoelectrochemical performance, and can achieve a high photocurrent density at a low potential. At 1.23 vs. RHE, the highest photocurrent density generated is 4.2 mA / cm 2 , which is about 3 times that of BiVO4 photoanode.

The invention provides a method for preparing chiral sulfinic acid thioester through asymmetric oxidation, which is characterized in that a disulfide compound is used as a raw material, a chiral aminoindanol-derived alloxan compound is used as a chiral catalyst, hydrogen peroxide or oxygen is used as an oxidant, and the chiral sulfinic acid thioester is prepared through asymmetric oxidation. Compared with a traditional chiral imine ligand matched with a vanadyl acetylacetonate catalyst, an aminoindanol-derived alloxan compound is used as a chiral small-molecule catalyst, so that the chiral small-molecule catalyst has higher catalytic stability and high optical purity of a product, is not influenced by factors such as the stirring speed, the shape and size of a reaction bottle and the like, and is convenient for engineering amplification; meanwhile, compared with a chiral resolution method, the method for synthesizing the chiral sulfinic acid thioester in one step by using a chiral small molecule catalysis method has higher step economy, and the method is simple to operate, high in raw material conversion rate, good in reaction enantioselectivity, high in product yield and high in optical purity.

The invention discloses a quinoline vanadium compound, a preparation method thereof and application of the quinoline vanadium compound serving as a catalyst to preparation of naphthenic alcohol and naphthenic ketone through catalytic oxidation of naphthenic hydrocarbon. Wherein the quinoline vanadium compound is obtained by reacting hydroxyquinoline and vanadyl acetylacetonate in a solvent, standing and filtering, and the whole preparation process is simple and easy to operate. When being used as a catalyst, the catalyst can be mixed with a cycloalkane raw material to carry out catalytic oxidation reaction under the action of an oxidant, the reaction temperature is low, byproducts are few, the environmental influence is small, the safety coefficient is high, and the conversion rate of cycloalkane after the reaction is over 60 percent and can reach 78 percent to the maximum; the selectivity of the naphthenic alcohol and the naphthenic ketone obtained at the same time is 84% or above, and the highest selectivity can reach 96%.

The invention discloses a 2, 3-dihydro-3, 5-dihydroxy-6-methyl-4 (H) pyran-4-one-oxygen vanadium complex as well as a preparation method and application of the 2, 3-dihydro-3, 5-dihydroxy-6-methyl-4 (H) pyran-4-one-oxygen vanadium complex. The preparation method comprises the following steps: carrying out a reaction on glucose and piperidine to obtain 2, 3-dihydro-3, 5-dihydroxy-6-methyl-4 (H) pyran-4-ketone, carrying out a reaction on 2, 3-dihydro-3, 5-dihydroxy-6-methyl-4 (H) pyran-4-ketone and vanadyl sulfate or vanadyl acetylacetonate to obtain a 2, 3-dihydro-3, 5-dihydroxy-6-methyl-4 (H) pyran-4-ketone-vanadyl complex, and carrying out a reaction on the 2, 3-dihydro-3, 5-dihydroxy-6-methyl-4 (H) pyran-4-ketone and vanadyl sulfate or vanadyl acetylacetonate to obtain the 2, 3-dihydro-3, 5-dihydroxy-6-methyl-4 (H) pyran-4-ketone-vanadyl complex. Raceme and enantiomer of the compound are shown in the specification. The obtained complex is used as a PTP1B enzyme inhibitor to be applied to preparation of drugs for reducing blood sugar. According to the invention, 2, 3-dihydro-3, 5-dihydroxy-6-methyl-4 (H) pyran-4-ketone with antioxidant activity is used as a ligand to form a complex with vanadium oxide, so that vanadium can play a role in reducing blood sugar, and oxidative stress can be potentially reduced through the antioxidant activity of the ligand.

The invention discloses a preparation method of vanadium-doped ZIF-8-derived nitrogen-doped out-phase ZnTe powder, which comprises the following steps: by taking a mixed liquid of water and dimethylformamide as a solvent and taking vanadyl acetylacetonate and zinc nitrate hexahydrate as a vanadium source and a zinc source respectively, carrying out cooperative control on the concentrations, the ratio, the reaction temperature and the reaction time of the vanadium source and the zinc source to obtain the vanadium-doped ZIF-8-derived nitrogen-doped out-phase ZnTe powder. The ZnV-ZIF precursor is prepared by a coprecipitation method; and mixing the precursor with Te powder, and calcining. According to the method, a V element is introduced into ZIF-8 in situ by using a coprecipitation method, the element distribution is uniform, the quantity is controllable, and the doping effect of V and the adjustment of a ZnTe homogeneous and heterogeneous heterostructure can be well ensured.

The invention discloses a method for preparing a bismuth vanadate photo-anode material through oxygen-enriched calcination and application, and belongs to the technical field of photoelectrocatalysis. The method comprises the following steps: step 1, preparing a mixed solution of vanadyl acetylacetonate and dimethyl sulfoxide; 2, dropwise adding a mixed solution of vanadyl acetylacetonate and dimethyl sulfoxide to the surface of the BiOI thin film, transferring the BiOI thin film to an oxygen-enriched atmosphere environment in which the O2 content accounts for 40-80%, heating to a calcination temperature, and maintaining a constant-temperature reaction; and 3, after the constant-temperature reaction is finished, cooling to room temperature, and cleaning to obtain the clean bismuth vanadate photo-anode material. According to the bismuth vanadate photo-anode material prepared through the method, effective separation of photon-generated carriers can be achieved, the photoelectrocatalysis water oxidation performance is remarkably improved, and more possibilities are provided for preparing and storing clean energy in the future.

The invention relates to an amorphous vanadium-doped carbon nitride catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: selecting amino-rich carbon nitride as a catalyst carrier, taking vanadyl acetylacetonate as a vanadium source, carrying out acid treatment on the vanadium source and the carbon nitride, and then carrying out heat treatment at high temperature to form the amorphous V / g-C3N4 composite catalyst. In the preparation process, due to strong interaction between metal and the carbon nitride carrier, agglomeration of vanadium species nanoparticles can be inhibited, and high dispersity of the V species on the carbon nitride carrier is achieved. The V / g-C3N4 composite catalyst disclosed by the invention shows good catalytic performance in a reaction for synthesizing phenol through benzene hydroxylation. Meanwhile, the preparation process of the catalyst is simple, convenient and rapid; synthesis raw materials are low in cost; no secondary pollution is generated; the development concept of green chemistry is met.

The present invention relates to a lanthanum, vanadium, and iron co-doped bismuth titanate layered perovskite thin film, a preparation method, and an application. The method includes the following steps: S1. Mix bismuth nitrate pentahydrate, lanthanum nitrate hexahydrate, tetrabutyl titanate, vanadyl acetylacetonate, iron nitrate nonahydrate, ethylene glycol monomethyl ether, acetic acid, and a chelating agent to obtain a Bi 3.25 La 0.75 Ti 3‑2x V x Fe x O 12 (BLTVF) sol, where 0 < x < 0.5; S2. Coat the BLTVF sol on a substrate to obtain a wet film; S3. Perform pyrolysis and annealing treatment on the wet film in air; S4. Repeat steps S2 and S3 to obtain a lanthanum, vanadium, and iron element co-doped Bi 3.25 La 0.75 Ti 3‑2x V x Fe x O 12 thin film. The present invention has significantly improved the energy storage performance and energy storage efficiency of the thin film on the Pt / Ti / SiO2 / Si substrate; the preparation method is extremely simple, the content of the added elements is flexibly controllable, the success rate of thin film preparation is high, and the repeatability is good; only simple processes and low-cost equipment are required, and the environmental requirements are simple, which is suitable for batch production.

A graphene-coated V3S4@NC material and a preparation method therefor and the use thereof. The material is composed of V3S4@NC and graphene coated on the surface of V3S4@NC, wherein V3S4@NC is of a core-shell structured nanofiber composite material with a V3S4 core and an NC shell. The method comprises the following steps: step I: adding a sulfur powder, vanadyl acetylacetonate (VO(acac)2), polyacrylonitrile (PAN), and graphene oxide to N-N dimethylformamide (DMF), stirring same for 12 h, followed by ultrasonic oscillation to obtain a mixed solution; step II: filling a syringe with the mixed solution obtained in step I, performing electrostatic spinning at a flow rate of 0.4 mL / h under a voltage of 18 kV, and collecting a product, so as to obtain a precursor; and step III: placing the collected precursor in a protective atmosphere, and annealing same at 800 ºC for 3 h to obtain a graphene-coated V3S4@NC material. The product can enable the reduced transport distance of sodium ions, and improvement of the electrochemical performance thereof.

A method for coating a substrate with a Co—Pi modified BiVO4 / WO3 heterostructure film includes direct current reactive sputtering tungsten (W) onto a substrate in a gaseous mixture containing oxygen to form a tungsten trioxide (WO3) film, direct current reactive sputtering bismuth (Bi) onto the tungsten trioxide (WO3) film in a gaseous mixture containing oxygen to form a dibismuth trioxide (Bi2O3) film, drop-casting a vanadyl acetylacetonate solution onto the Bi2O3 film and heating at a temperature of at least 450° C. in ambient air to convert the Bi2O3 film to a BiVO4 film, and photoelectrochemically coating the BiVO4 film with a cobalt-phosphate (Co—Pi) to form a modified film on the surface of the substrate. A photoanode containing the Co—Pi modified BiVO4 / WO3 heterostructure film prepared by the method, and its application in water splitting.

Proposed are a photoanode and method for fabricating a photoanode used as a photoelectrochemical water-splitting device. According to these specific implementation embodiments of this technique, a BiOI photoactive material is electrodeposited on the surface of the FTO photoanode through an electrodeposition process. Then, 60 μL of dimethyl sulfoxide (DMSO) solution containing vanadyl acetylacetonate (VO(acac)2) is drop-cast on the FTO photoanode, and then the FTO photoanode is annealed at a temperature of 500° C. with a heating rate of 2° C. / min., thus fabricating a BiVO4 photoanode. The surface of the fabricated BiVO4 photoanode is coated with a metal-organic complex (Co-DTPMP) cocatalyst through a SILAR process to fabricate a BVO / Co-DTPMP photoanode. Through this, it is possible to greatly improve photoelectrochemical performance and oxygen evolution reaction (OER) rate.

A method for semiconductor bridge current protection based on vanadium dioxide thick-film thermistor is provided, which relates to the field of semiconductor bridge current protection technologies. A copper, nickel, or gold interdigitated electrode is deposited on an aluminum oxide ceramic substrate. A vanadyl acetylacetonate methanol solution is sprayed onto a surface of the heated interdigitated electrode to obtain a vanadium dioxide thermistor device. This device is connected in parallel with a semiconductor bridge to achieve thermistor-based semiconductor bridge current protection. By adjusting a synthesis method and process, vanadium dioxide with a relatively single valence state can be synthesized, thereby achieving one-step synthesis of M-phase vanadium dioxide directly on the interdigitated electrode. This preparation method avoids a cumbersome process of first preparing vanadium dioxide powder and then transferring it onto the surface of the interdigitated electrode, and the vanadium dioxide can also be more stably bonded to the interdigitated electrode surface.

The present invention provides a method for preparing vanadyl acetylacetonate, comprising the following steps: Step 1: Mix a vanadium source, a reducing agent and water to prepare a tetravalent vanadium solution; Step 2: Mix acetylacetone and a two-way solvent; Step 3: Pour the mixed solution in Step 2 into the tetravalent vanadium solution in Step 1, with the molar ratio of V to acetylacetone being 1:1.0 - 1.5, and carry out the reaction in a water bath at 70 - 100 °C until there are no bubbles, and the reaction ends; Step 4: After filtration, wash the filter residue with pure water and dry it to prepare vanadyl acetylacetonate. The method for preparing vanadyl acetylacetonate of the present invention has the advantages of short reaction time, high conversion rate and no waste generation.

The invention discloses a high-specific-capacity sodium ferrovanadium phosphate positive electrode material, a preparation method thereof and a sodium ion battery. Iron acetylacetonate and vanadyl acetylacetonate are adopted as an iron source and a vanadium source, the preparation method is simple, and the synthesized high-sodium positive electrode material has the advantages of high rate capability and high specific capacity by replacing vanadium with iron, and is long in cycle life and good in cycle stability. And the method is of great significance in promoting the application of the sodium-ion battery in the field of large-scale energy storage.

The invention discloses a vanadium-based catalyst, a preparation method thereof and application of the vanadium-based catalyst in catalyzing oxidation of 5-hydroxymethylfurfural to prepare 2, 5-diformyl furan, and the vanadium-based catalyst is prepared from a nitrogen-containing compound, an aldehyde compound, a vanadium-containing compound and chloromethylated polystyrene resin; wherein the nitrogen-containing compound is selected from at least one of amino acid and alcohol amine; the aldehyde compound is selected from at least one of a benzaldehyde compound and a benzoic acid compound; the vanadium-containing compound is selected from at least one of vanadyl acetylacetonate, vanadyl trichloride, vanadyl phosphate, vanadyl oxalate, vanadyl sulfate and sodium metavanadate. When the catalyst is used for catalyzing oxidation of 5-hydroxymethylfurfural to prepare 2, 5-diformyl furan, the oxidation efficiency is high, the product yield is high, the reaction conditions are mild, the catalyst is easy to separate from the product, and the product is easy to purify. The method has a wide application prospect.

The present invention provides a catalyst for degrading pollutants by activating dissolved oxygen at normal temperature and pressure, and a preparation method and application thereof. The preparation method of the present invention comprises the following steps: S1: Dissolve vanadyl acetylacetonate and 2-methylimidazole in an organic solvent, then add zinc nitrate and carry out a polymerization reaction under alkaline conditions. After the reaction, filter, wash, and dry to obtain an intermediate; S2: Grind the intermediate and then calcine it, and after grinding, washing, and drying again, obtain a catalyst for degrading pollutants by activating dissolved oxygen at normal temperature and pressure. The catalyst of the present invention can activate dissolved oxygen to degrade pollutants at normal temperature and pressure and within a relatively wide pH range, without the need for external energy and additives. The catalyst has a long service life and good stability during the degradation of pollutants, greatly reducing the treatment cost of new pollutants in water.

The invention belongs to the field of vanadium recovery, and particularly relates to a method for preparing vanadyl acetylacetonate. The invention provides a method for preparing vanadyl acetylacetonate. The method comprises the following steps: (1) adjusting the valence state of vanadium ions in a waste vanadium electrolyte to + 4 to obtain a tetravalent vanadium solution; (2) carrying out multi-stage counter-current extraction on the tetravalent vanadium solution by adopting acetylacetone to obtain an organic phase containing vanadyl acetylacetonate and waste acid; the number of extraction stages is 3-7; the extraction temperature is 20-40 DEG C; (3) cooling, crystallizing, filtering, washing and drying the organic phase containing vanadyl acetylacetonate to obtain vanadyl acetylacetonate; the cooling crystallization temperature is 5-15 DEG C. The preparation method has the advantages of high product purity, low energy consumption and environmental protection.