15 results about "Ferricyanide" patented technology

The invention provides a high-entropy Prussian blue material and a preparation method and application thereof, and relates to the technical field of electrochemical material preparation and energy. The preparation method of the high-entropy Prussian blue material comprises the following steps: mixing a cobalt source, a nickel source, a copper source, a manganese source, a zinc source, an organic reducing compound and a first dispersing agent to obtain a first mixture; the molar ratio of the cobalt source to the nickel source to the copper source to the manganese source to the zinc source is 1: 1: 1: 1: 1; mixing the ferricyanide compound with a second dispersing agent to obtain a second mixture; and sequentially stirring and standing the first mixture and the second mixture to obtain the high-entropy Prussian blue material. The high-entropy Prussian blue material prepared by the method is stable in morphology, high in crystallinity and high in chemical stability, and can be applied to the field of electrochemical energy storage.

The invention belongs to the technical field of pyruvic acid biological detection, and relates to a pyruvic acid sensing chip of a Prussian blue nano frame / gold nano composite material. The method comprises the following steps: adding soluble metal salt containing ferricyanide ions into water; the method comprises the following steps: adding soluble ferric salt and a complexing agent into water, mixing, and carrying out hydrothermal synthesis reaction to obtain PB powder; adding PB powder into ethanol, adding ammonia water for reaction, mixing with conductive carbon paste to obtain nano printing paste, and printing the printing paste on a substrate to form a working electrode; the preparation method comprises the following steps: preparing a working electrode, drying the working electrode, placing the working electrode in a chloroauric acid solution for constant potential electrodeposition, mixing a PBS solution of pyruvate oxidase, a polylysine solution and an EDC solution, dropwise adding the mixture on the surface of the working electrode, and drying to obtain the pyruvic acid sensing chip. The obtained pyruvic acid sensor can reach the sensitivity of 50.42 [mu] A.mM <-1 >. Cm <-2 >, and is simple in preparation process and relatively low in cost.

The present application relates to the field of adsorbing material, discloses a kind of rubidium cesium ion adsorbing material and its preparation method and application, the rubidium cesium ion adsorbing material includes framework and the organic sulfonate and / or organic sulfate modified metal ferricyanide adsorbent dispersed in the framework;The framework includes polyvinyl alcohol and crosslinked sodium alginate;The framework and the organic sulfonate and / or organic sulfate modified metal ferricyanide adsorbent are connected by amino-containing silane coupling agent.The rubidium cesium ion adsorbing material is not easy to fall off in long-term use process, metal ferricyanide adsorbent has high saturation adsorption capacity of rubidium and cesium and excellent stability.

The application discloses a method for synthesizing high-entropy metal phosphide catalytic material and belongs to the field of catalytic material. Specifically, metal salt is mixed with an alkali source, a substrate is added, and hydroxide is grown on the substrate by using a hydrothermal reaction; then, a mixed solution of metal salt and a chelating agent is mixed with a mixed solution of ferricyanide and cobalt cyanide, the substrate after the reaction is added, and a Prussian blue analogue precursor is grown on the substrate under the condition of a certain temperature; the obtained precursor is washed and dried, and then is subjected to continuous two-step calcination in a nitrogen-argon mixed gas; after the calcination is completed, a target product is obtained. The Prussian blue derivative metal phosphide catalytic material product obtained by using the application has high chemical stability and excellent electrocatalytic performance, and the preparation method has the characteristics of simple process flow, low cost, and high product yield.

The application discloses a vanadium-based prussian blue analogue composite material, which is a substance with two kinds of prussian blue analogue structures obtained by introducing zinc ions into a vanadium-based prussian blue analogue, wherein Fe, V and Zn are all redox active sites, and the vanadium-based prussian blue analogue composite material can provide additional specific capacity through multi-oxygen reduction reaction in the charging and discharging process. In addition, the trivalent vanadium ion solution obtained by using a zinc powder reduction method is more stable, and the use of ethylenediaminetetraacetic acid dipotassium (EDTA-2) as a chelating agent can obtain a complex with the trivalent vanadium ion, so that the purpose of inhibiting the rapid precipitation of the prussian blue analogue material is achieved. Through slow dissociation of metal ions and orderly coordination crystallization with ferricyanide ions, the crystal nucleus is slowly grown, and finally grown into a composite material with high crystallinity and low defect content, so that the influence of water molecules on the structure of the prussian blue analogue material is reduced.

The invention discloses a novel method for recovering valuable metals in waste neodymium iron boron, and relates to the technical field of neodymium iron boron waste recovery. According to the method, the waste neodymium iron boron is subjected to acid leaching by adopting the inorganic acid as the leaching agent, so that iron and rare earth are fully dissolved in the leaching agent, impurities are removed through liquid-solid separation, ferrous cyanate is used as the iron precipitation agent, iron is separated out in the form of Prussian blue precipitation, rare earth is reserved in a liquid phase, efficient separation of iron and rare earth is achieved, and the method is suitable for industrial production. And the iron precipitation effect is obvious. According to the method, the Prussian blue precipitate obtained through the iron precipitation reaction reacts with the alkali liquor to generate alpha-FeOOH and the ferrocyanate solution, the alpha-FeOOH can be used as an adsorbent, a catalyst and an energy storage material for high-valued recovery after being dried, meanwhile, the generated ferrocyanate solution can be recycled, the production cost is reduced, and waste liquid is reduced.

The invention provides a preparation method of a FeP4-CoP nanocage catalyst and an electro-catalysis application of the FeP4-CoP nanocage catalyst. The preparation method comprises the following steps: taking a porous reticular zeolite imidazate framework structure ZIF-67 as a template, carrying out ion exchange reaction on the template and ferricyanide in a solution to prepare an intermediate with a nano cage-shaped structure, and carrying out calcination treatment in a PH3-rich atmosphere to obtain the FeP4-CoP composite material with a unique nano cage-shaped structure. In view of the unique structure and component advantages of the material, the material has multiple advantages in an electro-catalytic reaction: firstly, the nano cage-shaped structure has a relatively large specific surface area and provides rich active sites; secondly, the structure is beneficial to rapid diffusion of gas and electrolyte, so that the mass transfer efficiency is improved, and the catalytic reaction efficiency is improved; finally, the catalytic activity of the catalyst is further improved through the synergistic effect between FeP4 and CoP. On the basis, in a 1.0 M KOH electrolyte, the FeP4-CoP electrocatalyst shows excellent oxygen evolution reaction catalytic activity, when the current density reaches 10 mA / cm < 2 >, the overpotential of the FeP4-CoP electrocatalyst is 265 millivolts, and the FeP4-CoP electrocatalyst has good stability.

This invention belongs to the field of organic synthesis technology and relates to a method for synthesizing 3,4-difluoro-2-methoxyphenylacetic acid, comprising the following steps: S1 Using 3,4-difluoro-2-methoxyaniline and a diazotizing reagent as raw materials, a diazotization reaction is carried out under the action of a copper catalyst and an inorganic acid to obtain the 3,4-difluoro-2-methoxyaniline diazonium salt; subsequently, a Sandmeyer reaction is performed with bromine to obtain 6-bromo-2,3-difluoroanisole; S2 The 6-bromo-2,3-difluoroanisole obtained in step S1 is reacted with diethyl malonate under the action of a ferricyanide to obtain 2-(3,4-difluoro-2-methoxyphenyl)malonic acid; S3 The 2-(3,4-difluoro-2-methoxyphenyl)malonic acid obtained in step S2 is reacted with concentrated sulfuric acid to obtain 3,4-difluoro-2-methoxyphenylacetic acid. This invention features mild reaction conditions, high yield, and high purity, making it suitable for industrial production.

The invention relates to the field of compound preparation, and discloses a method for preparing ferrocyanate by taking ferrous oxide as an iron source, the method comprises the following steps: contacting a raw material A containing ferrous oxide with a solution B of alkali metal cyanide, and reacting at 40-80 DEG C to obtain the ferrocyanate, the alkali metal cyanide comprising sodium cyanide and / or potassium cyanide. According to the method for preparing the ferrocyanate, sulfate containing ferrocyanide is not byproduct, the reaction temperature is mild, the cyanide hydrolysis phenomenon is basically avoided, the yield is high, NH3 and H2 are not released in the reaction process, the process is safe, and the method is a green process which is economical and reasonable in atom, free of byproduct and free of waste gas, waste residues and waste water. Compared with the traditional method, the method provided by the invention has the advantages of almost no three wastes, low production cost, high added value of products and better industrial prospect.

The invention discloses a ferrocyanide radical cyclic regeneration assistance-based high-salt water body stable electrolytic hydrogen production method, and belongs to the field of water electrolysis hydrogen production. The method comprises the following steps: adding a ferrocyanide solution into an anolyte storage tank, taking a pretreated graphite felt as an anode, and replacing a traditional oxygen evolution reaction with a ferrocyanide anode oxidation reaction; and a chlorine-resistant reduction catalyst is added into the anolyte storage tank, so that a ferrocyanide oxidation product ferricyanide is efficiently reduced into ferrocyanide, and closed-loop circulation of the redox couple in the system is realized. According to the method, the ferrocyanide anodic oxidation reaction which is lower in theoretical oxidation potential and more advantageous in dynamics is introduced to replace the oxygen evolution reaction, the potential difference with the chlorine evolution reaction is greatly enlarged, and the selectivity under the conditions of large current and high chlorine concentration is improved. Meanwhile, the chlorine-resistant reduction catalyst is added into the anolyte storage tank and heated to catalyze the reduction and regeneration of ferrocyanide radicals, and continuous and stable low-power-consumption hydrogen production can be realized without continuously adding substances.

The application provides a preparation method and application of Prussian blue and activated carbon-Prussian blue material. The preparation method of the Prussian blue comprises the following steps: adding a reducing agent to an aqueous solution containing ferricyanide complex for reduction treatment, so that the ferricyanide complex is reduced into ferrocyanide, and a ferrocyanide solution containing ferrocyanide and other reducing substances is obtained; adding a first iron salt solution to the ferrocyanide solution for de-reduction treatment, so that the other reducing substances contained in the ferrocyanide solution are removed, and a ferrocyanide ferrous carbonate precipitate and a post-precipitation liquid containing ferrocyanide are obtained through solid-liquid separation; and adding a second iron salt solution to the post-precipitation liquid for post-treatment, so that the ferrocyanide reacts with iron ions to obtain a Prussian blue slurry. The preparation method provided in the examples of the application can reduce the impurity content of the Prussian blue, improve the purity of the Prussian blue, and is beneficial to the preparation of activated carbon-Prussian blue material with better energy absorption performance.

A treatment method for wastewater containing a ferricyanide complex and oxalate. The method comprises: under weakly acidic to weakly alkaline conditions, firstly, adding a suitable amount of divalent

The invention provides a diatomic catalyst as well as a preparation method and application thereof, and belongs to the technical field of electrochemical catalysis. The preparation method of the diatomic catalyst comprises the following steps: adding a nitrogen-containing carbon material into a transition metal-containing solution, and carrying out primary impregnation reaction to obtain primary impregnated powder; under the protective gas atmosphere, the powder obtained after first-time dipping is subjected to first-time roasting at the temperature of 900 DEG C-1100 DEG C, and mixture powder is obtained; adding the mixture powder into a ferricyanide solution, and carrying out second-time impregnation reaction to obtain second-time impregnated powder; and performing secondary roasting on the powder subjected to secondary impregnation at 900-1100 DEG C in a protective gas atmosphere to obtain the diatomic catalyst. In the preparation process, high-temperature roasting etching operation and metal dipping operation are adopted at the same time, and the bifunctional catalyst with diatomic-scale bimetal or diatomic-scale monometal catalytic sites is effectively synthesized.

The application discloses a two-dimensional high-entropy Prussian blue analogue nanomaterial, and a preparation method of the two-dimensional high-entropy nanomaterial. The two-dimensional high-entropy nanomaterial is formed by assembling high-entropy Prussian blue analogue nanosol particles; wherein the high-entropy sol nanometer particles are obtained by coordinating five or more than five transition metal ions with ferrocyanide or ferricyanide. The application also discloses a preparation method of the two-dimensional high-entropy nanomaterial. The configuration entropy of the Prussian blue analogue is significantly improved by coordinating five or more than five transition metal cations with ferrocyanide or ferricyanide, the high-entropy effect helps to stabilize the crystal structure, reduces the dissolution of transition metals in the Prussian blue analogue, reduces the change of the unit cell volume in the charging and discharging process, and is beneficial to the reversible deintercalation of sodium ions. Meanwhile, the high-entropy sol nanometer particles are assembled into two-dimensional nanomaterial, the high-entropy material is fully contacted with the electrolyte, the diffusion path of ions in the electrode material is shortened and the diffusion energy barrier is reduced, so as to improve the diffusion rate of sodium ions.

An aqueous electrolyte solution having an increased or decreased concentration of ferrocyanide is described. The increased or decreased concentration of ferrocyanide in the aqueous electrolyte solution is possible by virtue of the inclusion in the electrolyte solution of a polyion additive. The ferrocyanide component of the aqueous electrolyte solution may be sodium ferrocyanide, potassium ferrocyanide, or a combination thereof. The polyion polymer additive component of the aqueous electrolyte solution may a polycation or a polyanion. An aqueous electrolyte solution having an increased or decreased concentration of ferricyanide is also described.