43 results about "Sodium orthovanadate" patented technology

The invention relates to a method for separating and recovering vanadium and chromium from vanadium-chromium reduced waste residue. The method comprises the following main steps of: after removing water-soluble salts through slurrying and washing, extracting vanadium from the rest vanadium-chromium reduced waste residue by oxidizing in an alkaline solution; meanwhile, realizing the vanadium-chromium separation; cooling and crystallizing a leaching solution to obtain obtaining a sodium orthovanadate product; carrying out acid leaching on the vanadium-chromium reduced waste residue subjected to vanadium extraction; and preparing a basic chromium sulfate product after removing impurities, evaporating and crystallizing. According to the invention, the purity of the sodium orthovanadate product prepared by the method is higher than 93%, the content of Cr2O3 in the basic chromium sulfate can reach 24%, the content of Fe is lower than 0.1%, and the requirements on the basic chromium sulfate I type product in the HG / T 2678-2007 are met.

The invention discloses a manganese vanadate nano-micro material and a synthetic method and application thereof, belonging to the field of inorganic non-metallic materials. The composition of the nano-micro manganese vanadate material is Mn6.87(OH)3(VO4)3.6(V2O7)0.2, and the material is in the form of nanoparticle, microrod or microtube. The synthetic method comprises the following steps: preparing a mixed solution from sodium orthovanadate and manganese salt according to a mol ratio of V to Mn of 1-3: 1; adjusting the pH value of the mixed solution to be 7 to 8, carrying out stirring for 10 min, then transferring the mixed solution into a reaction vessel and carrying out a reaction at a temperature of 160 to 260 DEG C for 1 to 24 h so as to obtain the solution of a crude product; and cooling the solution of the crude product to room temperature and carrying out cooling and drying so as to obtain the manganese vanadate Mn6.87(OH)3(VO4)3.6(V2O7)0.2 nano-micro material. The invention has the following beneficial effects: the nano-micro material is synthesized by using a one-step hydrothermal method and a wet method, low-temperature controllable preparation of manganese vanadate is realized, and energy consumption is low; no surfactant or organic template is needed in the process of synthesis, so the synthetic method is friendly to the environment and the produced nano-micro material is pure and has excellent crystallization property; the nano-micro material has uniform morphology and size; and the synthetic method is simple, can be realized under controllable conditions, is suitable for batch production and lays a good foundation for application and research.

A preparation method of an electro-catalytic material VS2 for ENRR belongs to the field of electro-catalytic nitrogen fixation. The method comprises the following steps: mechanically mixing a precursor, performing microwave hydrothermal treatment on a precursor solution, and performing suction filtration, washing and vacuum drying on solid obtained by the hydrothermal treatment to obtain the VS2. The method is mainly used for preparing the VS2 electro-catalysis nitrogen fixation material, and the problem that the performance of VS2 prepared through a common hydrothermal method is poor when the VS2 is used for ENRR is solved. In addition, compared with vanadium disulfide VS2-x obtained by taking sodium orthovanadate as a vanadium source and thioacetamide as a sulfur source in a hydrothermal mode, pure vanadium disulfide VS2 with +4-valence V is obtained by taking ammonium metavanadate as the vanadium source and thioacetamide in a hydrothermal mode, and the corresponding ENRR performance of the vanadium disulfide VS2 is more excellent.

The invention discloses a preparation method of supercapacitor electrode material vanadium sulfide nanoflower. The method comprises the following steps that 1, sodium orthovanadate dodecahydrate and thioacetamide are prepared into a precursor solution, wherein the mass ratio of sodium orthovanadate dodecahydrate to thioacetamide is 1: (1.2-3.5), and the mass concentration of sodium orthovanadate dodecahydrate is 0.02-0.05 g / mL; 2, the precursor solution is subjected to a hydrothermal reaction, a product obtained after the reaction is completed is washed and dried, and the vanadium sulfide nanoflower is obtained. The prepared vanadium sulfide nanoflower is of a three-dimensional structure, stacking of flake vanadium sulfide is well avoided, the specific surface area of vanadium sulfide is increased, the vanadium sulfide nanoflower is used as an electrode material of a supercapacitor, higher specific capacity can be obtained, the circulation service life is prolonged, and high energy density and power density are achieved; the maximum specific capacity of the prepared vanadium sulfide nanoflower can reach 500.4 F g<-1>, after circulation is conducted 500 times or above, the specificcapacity still reaches 459.4 F g<-1>, and the capacitance retention rate is 91.9%.

The invention provides a vanadium-doped carbon-coated iron carbide multifunctional composite electrocatalyst, a preparation method and application thereof, and belongs to the technical field of electrochemical catalysis. The preparation method comprises the following steps: mixing sodium orthovanadate, hexahydrate trichloride Ferric, dicyandiamide and sodium chloride are mixed uniformly and then heat-insulated at 700~950℃ under a protective atmosphere. The mass ratio of sodium orthovanadate, ferric chloride hexahydrate and dicyandiamide is (0.01~0.06) : (0.2~0.7): (2~4.5) to obtain a mixture; the mixture is cooled in a protective atmosphere, washed and dried in sequence to obtain a vanadium-doped carbon-coated iron carbide multifunctional composite electrocatalyst. The process of the invention is simple, the production cost is low, and the conditions are easy to control, and the electrocatalyst prepared by the method can be used for HER, OER and ORR, and exhibits excellent catalytic activity.

The invention discloses a method for cleanly preparing vanadium oxides, comprising the following steps of: with vanadate as a raw material and reducible gases as reducing agents, making the vanadate react with the reducible gases at the temperature of 300-1500 DEG C for 0.5-8h to obtain low-valent vanadate and a byproduct of NaOH; cooling and then washing a reaction mixer with water; hydrolyzing the washed product at the temperature of 20-200 DEG C for 0-6h; and filtering the hydrolysate and then drying the hydrolysate at the temperature of 80-300 DEG C for 0-24h to obtain vanadium oxides (V2O5, V2O3 and VO2) and a byproduct of vanadium-containing alkaline solution for cycle use. Meanwhile, the preparation of the vanadium oxides and the discharge of non-polluted products are realized and the problems of the vanadium and high-ammonium contained wastewater and the like in the industrial production method are solved. The vanadium acid and alkali salts comprise metavanadate, ortho-vanadate and pyrovandate which are respectively sodium metavanadate or potassium metavanadate, sodium orthovanadate or potassium orthovanadate and sodium pyrovanadate or potassium pyrovanadate; and the reducing gases include hydrogen gas, natural gas, ammonia gas, coal gas or a mixer of the hydrogen gas, the natural gas, the ammonia gas and the coal gas.

The present invention provides a method of mediating hypo-activation of NK cells. Methods of the present invention comprise administering to a subject an effective amount of broad acting phosphotase inhibitor, such as sodium orthovanadate, SHP specific inhibitor. In one embodiment, the SHP specific inhibitor is NSC119910.

The invention provides a preparation method for a black abrasion-resistant micro-arc oxidization ceramic layer of a magnesium alloy. The magnesium alloy is dipped into electrolyte to be subjected to micro-arc oxidization so that the black abrasion-resistant micro-arc oxidization ceramic layer can be prepared; the electrolyte comprises 5-20 g / L of sodium silicate, 5-15 g / L of potassium fluoride, 1-60 g / L of potassium hydroxide, 5-25 g / L of triethanolamine, 2-6 g / L of ammonium meta-vanadate, 2-6 g / L of sodium orthovanadate, 2-10 g / L of nanometer SiC and 2-5 g / L of nanometer graphite. The black abrasion-resistant ceramic layer of the magnesium alloy can reach the level 9 according to 350 h of a neutral salt spray test, the Vickers hardness HV can reach 553-605, the friction coefficient is 0.08-0.14, the abrasion rate is 0.006-0.009 mg / min, the beneficial effects that stability is good, color is uniform and color fading is not prone to occurrence are all achieved, and the black abrasion-resistant micro-arc oxidization ceramic layer of the magnesium alloy is very suitable for preparing an optical collimator and other systems. The preparation method for the black abrasion-resistant micro-arc oxidization ceramic layer of the magnesium alloy is simple in technological process, convenient to operate, small in pollution and remarkable in industrial value.