6results about "Metal cyanides" patented technology

The invention relates to the technical field of all-vanadium redox flow battery electrolyte additives, and discloses a Prussian-blue-like additive for a vanadium electrolyte as well as a preparation method and application of the Prussian-blue-like additive. Comprising the following steps: dissolving a first metal source, a second metal source and a structure stabilizer in an acid solution, and carrying out uniform dispersion treatment to obtain a uniform dispersion liquid I; dissolving ferrous cyanide salt and organic phosphonate in deionized water, and carrying out uniform dispersion treatment to obtain a uniform dispersion liquid II; performing continuous ultrasonic treatment on the uniform dispersion liquid II, and dropwise adding the uniform dispersion liquid I into the uniform dispersion liquid II to obtain a prussian blue-like precursor liquid; and carrying out heat treatment on the Prussian blue-like precursor solution to obtain the Prussian blue-like additive for the vanadium electrolyte. And the material can be used as an all-vanadium redox flow battery electrolyte additive to effectively improve the discharge capacity and the capacity retention ratio of the battery.

This invention provides a method for producing cyanide that can be manufactured at room temperature, a method for using a metal oxide catalyst in the manufacturing process, and a method for recovering metal using the manufacturing method. [Solution] General formula (1): JPEG2026079578000011.jpg4269 (R in equation (1)) 1 , R 2 and R 3 Each of these is independently a hydrogen atom or a monovalent organic group which may have a substituent. A method for producing cyanide, comprising the steps of: preparing a solution by dissolving compound (A) represented by in an aqueous solvent; and preparing a mixed suspension by adding a metal oxide catalyst to the solution under oxygen-free conditions, thereby oxidizing compound (A) to produce cyanide.

This invention relates to the field of cesium ion adsorption materials, specifically to an acid-controlled copper-based Prussian blue analogue, its preparation method, and its application. The invention provides a method for preparing an acid-controlled copper-based Prussian blue analogue, comprising: adding potassium ferrocyanide solution to a mixture of polyvinylpyrrolidone and a copper salt solution, followed by stirring and aging to obtain particulate copper-based Prussian blue analogue; adding the particulate copper-based Prussian blue analogue to a mixture of acid and N,N-dimethylformamide, followed by heating to obtain an acid-controlled copper-based Prussian blue analogue. This invention utilizes acid control to induce new structures and more adsorption sites in the copper-based Prussian blue analogue, thereby achieving selective and efficient adsorption of cesium ions in water, significantly reducing the interference of sodium ions on cesium ion adsorption, and making it more stable in solution.

The present application relates to a kind of copper cyanide complex wastewater high-efficiency copper removal and recycling process, comprising the following steps: (1) copper cyanide complex wastewater critical acidification-selective crystallization: by accurately controlling wastewater pH value, make copper cyanide complex directional recombination generate insoluble CuCN crystal;(2) cyclone enhanced crystallization: by water cyclone, CuCN crystal and overflow liquid are separated;(3) composite sulphidizing agent gradient activation deep copper removal: by adjusting pH value and adding composite sulphidizing agent, make micro CuCN particle and dissolved low coordination copper cyanide complex reaction generate insoluble CuS crystal;(4) magnetic seed enhanced separation: using modified magnetic seed and weak magnetic separator magnetic separation, CuS magnetic flocculation is separated from wastewater, and finally purified tail liquid is obtained.The closed-loop process of the present application can efficiently remove and recover copper in copper cyanide complex wastewater, and the purified tail liquid can be used for cyanide leaching operation, significantly reduce the consumption of sodium cyanide and improve gold and silver leaching rate, truly realize wastewater zero discharge and copper resource full recovery.

The invention discloses a sulfur-doped Prussian blue-like nano hollow box as well as a preparation method and application thereof, and relates to the technical field of material science. The preparation method comprises the following steps: S1, dissolving nitric acid transition metal salt, transition metal chloride salt and trisodium citrate in deionized water, and stirring to obtain a solution A; s2, dissolving potassium ferricyanide in deionized water to obtain a solution B; s3, mixing the solution A and the solution B, stirring, standing, and centrifugally washing to obtain the Prussian blue analogue. And S4, dispersing the obtained Prussian blue analogue in an ethanol solution, transferring into a high-pressure hydrothermal kettle, adding a certain amount of sulfide salt into the high-pressure hydrothermal kettle, putting into a drying oven, reacting at a certain temperature, naturally cooling, centrifuging to obtain a precipitate, and washing to obtain the sulfur-doped Prussian blue-like nano hollow box. According to the sulfur-doped Prussian blue-like nano hollow box as well as the preparation method and the application thereof, the photo-thermal performance and the catalytic performance of the Prussian blue-like nano hollow box are improved.

The application discloses a Prussian blue analogue self-supporting anode for an anion exchange membrane water electrolyzer, and a preparation method thereof, which comprises the following steps: reacting pretreated nickel foam (NF) with a metal salt solution, and then performing sulfidation treatment and nitrogen reduction treatment to prepare a metal sulfide nanomaterial rich in defects; and performing coordination reaction on the metal sulfide nanomaterial with citric acid and potassium ferricyanide to obtain Fe-coordinated Prussian blue analogue material CoFePBA@NiCo2S4 / NF. The self-supporting anode obtained by the application has excellent catalytic activity and stability, and the preparation method involved is relatively simple, the reaction condition is mild, the cost is relatively low, and the application is suitable for popularization and application.