176 results about "Potassium ferricyanide" patented technology

The invention discloses a Prussian blue analogue electrode and a preparation method and application thereof.The preparation method comprises the following steps that a manganese salt solution, a nickel salt solution and a potassium ferricyanide solution are prepared and added into water at the same time, a mixture with the molar ratio of manganese to nickel being larger than or equal to 0.1: 1 is obtained, aging, washing and drying are conducted, and the Prussian blue analogue electrode is obtained. And mixing the manganese-doped Prussian blue analogue with a binder, a conductive agent and a solvent, carrying out ultrasonic treatment to obtain an electrode slurry liquid, covering the surface of a current collector with the electrode slurry liquid, and drying to obtain the Prussian blue analogue electrode. The Prussian blue analogue electrode prepared by the method has the advantages of low energy consumption, high salt adsorption capacity, high salt adsorption rate and the like, can be used for desalting treatment as a capacitive deionization cathode, has the salt adsorption rate and the salt adsorption capacity which are more than two times of those of a conventional electrode, and is high in use value, good in application prospect and wide in application prospect. The method is of great significance in promoting wide application of the capacitive deionization technology.

The invention relates to the technical field of nano-enzyme preparation and electrochemical and colorimetric dual-mode sensing, and particularly discloses a Mn3Fe2.7-atC nano-enzyme, a preparation method thereof and application of the Mn3Fe2.7-atC nano-enzyme in determination of amoxicillin content. The preparation method of the Mn3Fe2.7 at C nano-enzyme is characterized by comprising the following steps: dissolving manganese chloride and trisodium citrate in water to prepare a solution A; dissolving potassium ferricyanide in water to prepare a solution B; adding the solution B into the solution A under a stirring condition, continuously stirring for 16-32 hours after the solution B is added, carrying out suction filtration, and drying the obtained precipitate to obtain a ferromanganese prussian blue analogue precursor; and placing the ferromanganese prussian blue analogue precursor in a tubular furnace, carrying out pyrolysis, and after the pyrolysis is finished, carrying out acid soaking, washing and drying to obtain the Mn3Fe2.7 at C nano-enzyme. When the Mn3Fe2.7 (at) C nano-enzyme is used for measuring the content of amoxicillin, the accuracy is good, and meanwhile, the Mn3Fe2.7 (at) C nano-enzyme has the advantages of interference resistance, stability, good recovery rate and the like.

The invention belongs to the technical field of electrochromic materials, and provides a red-transparent display electrochromic polymer and a preparation method thereof. The method disclosed by the invention comprises the following steps: carrying out ring formation reaction on N-(2, 5-dibromophenyl)-2-ethylhexyl thioamide, potassium ferricyanide and sodium hydroxide to obtain 4, 7-dibromo-2-(heptane-3-yl) benzothiazole; the preparation method comprises the following steps: carrying out substitution reaction on EDOT, n-butyllithium and tributyltin chloride to obtain EDOT-Sn; the preparation method comprises the following steps: carrying out Stille coupling reaction on 2, 4, 7-dibromo-2-(heptane-3-yl) benzothiazole and EDOT-Sn, and then carrying out electrochemical polymerization reaction to obtain the electrochromic polymer. A pure donor (D) type organic molecule is obtained by the method, a corresponding electrochromic film is prepared by electrochemical polymerization, reversible switching between red and transparency is realized, and the electrochromic film has good cycle stability and high color change response speed.

The invention provides a low-cyanide gold leaching agent system and a dump leaching process thereof, and belongs to the technical field of hydrometallurgy. According to the method, a synergistic process of'interface activation, cyanide etching and iron precipitation inhibition 'is constructed by designing a low-cyanide gold leaching agent system. The amino acid auxiliary leaching agent adsorbs the gold surface to weaken lattice energy, so that the etching efficiency of trace cyanide ions is improved; mercapto-containing malic acid is used as a chelating agent, specific mercapto in molecules of the mercapto-containing malic acid and iron ions form an ultrahigh-stability water-soluble complex, generation of ferric hydroxide precipitates is thoroughly blocked, ferrous ions stabilized by the chelating agent are subjected to in-situ oxidation through dissolved oxygen and efficiently regenerated into potassium ferricyanide, and accumulation of free cyanogens in a solution system is eliminated; meanwhile, a chelating agent-iron complex forms a self-buffering pair, the pH of the dump leaching solution is accurately controlled, and secondary precipitation caused by local alkalization is prevented. According to the process, under the synergistic effect that the core chelating agent guarantees permeation stability and the leaching aid accelerates gold dissolution, the heap leaching period is compressed to 45 days.

The invention provides a nano preparation for breaking oxidative stress-inflammation vicious circle and regulating intestinal flora as well as a preparation method and application of the nano preparation. The preparation method of the preparation comprises the following steps: dissolving potassium ferricyanide and polyvinylpyrrolidone in a solution, slowly dropwise adding a zinc acetate dihydrate solution into the solution, stirring, standing, and repeatedly performing ultrafiltration centrifugal washing to obtain zinc-doped Prussian blue; crushing the yeast cells to obtain yeast cell walls; the yeast cell wall and the zinc-doped Prussian blue are repeatedly co-extruded through a liposome extruder to obtain the nano preparation. The ZnPBA in the nano material can efficiently remove active oxygen at an inflammation part and reduce secretion of inflammatory factors, and the oxidative stress-inflammatory vicious circle of ulcerative colitis is broken; meanwhile, the YCW can deliver the ZnPBA to an inflammation part in a targeted manner to kill pathogenic escherichia coli, and mannose components can promote growth of probiotics to realize bidirectional regulation of intestinal flora. The material is simple in preparation method, can be synthesized on a large scale and is used for treating ulcerative colitis.

The invention belongs to the technical field of thermoelectric materials and functional polymer materials, and particularly relates to thermoelectric hydrogel based on synergistic enhancement of zwitterions and a polar solvent as well as a method and application of the thermoelectric hydrogel. The thermoelectric hydrogel is obtained through the steps that a precursor solution is subjected to a polymerization reaction to form a gel matrix, then the gel matrix is soaked in a soaking solution, potassium ferricyanide / potassium ferrocyanide redox couple is introduced, and the thermoelectric hydrogel is obtained, and the precursor solution is prepared from acrylamide, N-isopropylacrylamide, dimethyl sulfoxide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide and N, N-dimethylformamide. The photoinitiator is prepared by mixing N, N-dimethylformamide, 1-ethyl-3-methylimidazolium tetrafluoroborate, a zwitterionic monomer [2-(methylacryloyloxy) ethyl] dimethyl-(3-sulfopropyl) ammonium hydroxide, a cross-linking agent N, N '-methylene bisacrylamide, a photoinitiator and deionized water. The thermoelectric hydrogel prepared by the invention has high mechanical strength, high ductility and high Seebeck coefficient, and has better temperature resistance.

The invention provides a sulphide ore alkaline desulfurization and cyanidation gold leaching agent system and a method for extracting gold through the sulphide ore alkaline desulfurization and cyanidation gold leaching agent system, and belongs to the technical field of hydrometallurgy. According to the method, a ternary agent system consisting of potassium ferricyanide, low-concentration sodium cyanide and thioguanosine is constructed. An efficient'oxidation-inhibition 'synergistic system is formed between the auxiliary desulfurization agent potassium ferricyanide and the thioguanosine. The rapid and selective oxidation of potassium ferricyanide is smoothly carried out under the synergistic effect of thioguanosine, minerals are thoroughly decomposed, and the surface keeps high activity; meanwhile, due to the existence of the thioguanosine, the local microcell passivation risk and catalytic electron transfer can be eliminated more directionally. The sodium cyanide and the sodium cyanide complement each other, it is jointly guaranteed that the exposed gold can be smoothly and efficiently leached through follow-up low-concentration sodium cyanide, finally, the total consumption of reagents is reduced, environmental pollution is reduced, and meanwhile high-recovery-rate extraction of the gold in the sulfide ore difficult to treat is achieved.

The invention discloses a preparation method and application of a catalytic membrane based on monatomic iron-manganese oxide, and belongs to the field of catalytic membrane water treatment. The invention aims to solve the problems that a chromium fog inhibitor F-53B in the existing chromium plating wastewater is difficult to degrade, and the degradation rate is greatly reduced when residual PAM and F-53B coexist. The method comprises the following steps: 1, preparing a casting solution; 2, dripping the membrane casting solution into pores of a hollow ceramic membrane substrate and drying; 3, preparing a potassium ferricyanide aqueous phase solution; 4, preparing a manganese acetylacetonate oil phase solution; and 5, dipping the dispensed ceramic membrane substrate in a potassium ferricyanide water-phase solution, dropwise adding a manganese acetylacetonate oil-phase solution into pores of the ceramic membrane substrate subjected to water-phase treatment, and finally calcining. The application comprises the following steps: degrading chlorinated polyfluoroalkyl ether sulfonate; or in the presence of polyacrylamide, the catalyst is used for degrading the chlorinated polyfluoroalkyl ether sulfonate. The preparation method is used for preparation and application of the catalytic membrane based on the monatomic iron-manganese oxide.

The invention discloses a preparation method and application of an aqueous iron ion battery positive electrode material. The preparation method comprises the following steps: (1) respectively mixing a single type of ferric salt and potassium ferricyanide with water to obtain a solution A and a solution B; (2) mixing the solution A and the solution B, stirring in a water bath kettle, and carrying out a co-precipitation reaction to obtain a solid precipitate; and (3) centrifuging, washing and drying the solid precipitate to obtain the nano-particles with the particle size of 150-200nm. The obtained nanoparticles can be used as an aqueous iron ion battery positive electrode material, the positive electrode can realize Fe < 2 + > and NH4 < + > ion co-de-intercalation electrochemical reaction in the charging and discharging process, and the reversible specific capacity of the battery is remarkably improved; the embedded NH < 4 + > and N in the positive electrode material can form a stable hydrogen bond structure, so that the cycling stability of the battery is effectively improved. The preparation process is easy to operate, the product yield is high, the consistency is excellent, and the method is suitable for large-scale preparation and application.

The invention discloses an electrochemical microscopic imaging analysis method based on a fluorescence signal, which comprises the following steps of: constructing a fluorescence response electrochemical signal instrument by combining electrochemistry with a fluorescence microscope, and observing the redox potential of K3 [Fe (CN) 6] by taking a terpyridyl ruthenium (Ru (bpy) 32 +) / potassium ferricyanide (K3 [Fe (CN) 6]) fluorescence system as a research object. Influences of electrochemical behaviors on fluorescence signals are deeply explored, and the relationship between fluorescence signal changes and electric signal changes is revealed. According to the present invention, the combination of the electrochemical technology and the fluorescence signal is achieved, the disadvantage of the poor spatial-temporal resolution of the electrochemiluminescence is made up, the new dimension capable of being regulated and controlled by the electrical parameter is provided for the fluorescence imaging, and the Faraday current and the non-Faraday current can be completely reflected by the fluorescence signal. Therefore, the method has wide application value in the aspects of exploring the conductivity of the nano material and the like.

The invention discloses a method for preparing a potassium-rich type potassium battery positive electrode material by using a chelating agent. The positive electrode material of the potassium-rich type potassium battery is a potassium-rich manganese-based Prussian blue analogue KxTmyMn1-yFe (CN) 6, 0lt, x is less than or equal to 2, 0lt; yt; Yt; 1, the material is prepared through a normal-temperature coprecipitation method; comprising the following steps: mixing concentrated hydrochloric acid, potassium chloride and CMC in deionized water to obtain a first solution, dividing the first solution into two parts, respectively adding potassium ferrocyanide and transition metal salt, mixing and stirring the two solutions, aging, centrifugally collecting, cleaning and drying to obtain the potassium-rich type potassium battery positive electrode material. According to the invention, CMC is used as a chelating agent and combined with the synergistic effect of doped transition metal elements, so that ion and electron transport is promoted together, and the problems of Mn < 2 + > dissolution and water-related side reactions are effectively alleviated, thereby reducing charge transfer resistance, enhancing electrochemical kinetics, and realizing high capacity and long cycle performance.

The invention relates to the technical field of detection and identification of fentanyl substances, and discloses a selective quantitative detection method of fentanyl. According to the method, a differential pulse voltammetry (DPV) is used for making a linear relation diagram of a potassium ferricyanide peak current and fentanyl solutions with different concentrations to obtain a standard working curve, a linear equation is obtained through the standard curve, and the detection limit is 1.0 * 10 <-12 > mol.L <-1 >; the molecularly imprinted membrane modified electrode prepared by the invention is used for measuring the peak current of a potassium ferricyanide solution, so that fentanyl molecules can be indirectly and quantitatively analyzed and measured. The method is characterized in that a fentanyl molecularly imprinted membrane is electrically polymerized on the surface of a glassy carbon electrode, m-phenylenediamine is used as a functional monomer, and the selectivity and sensitivity of an electrochemical method for detecting fentanyl are improved. Meanwhile, by taking an adsorption pulse stripping voltammetry (DPASV) as a detection technology, a method capable of rapidly detecting fentanyl molecules in the presence of various drugs is established. The molecularly imprinted membrane electrode disclosed by the invention is simple to prepare, quick in response and good in selectivity and reproducibility, and can be repeatedly used for more than five times.

This invention belongs to the field of biochemical detection and discloses a portable hepatitis biomarker detection kit. The kit contains a hydrogel; the hydrogel is obtained by dispersing hollow manganese dioxide in water to obtain an H-MnO2 dispersion, mixing the H-MnO2 dispersion with sodium alginate solution to obtain a mixed solution, and then adding a calcium salt solution to obtain the hydrogel. The hollow manganese dioxide is obtained by etching manganese Prussian blue analog nanoparticles with sodium hydroxide. The manganese Prussian blue analog nanoparticles are prepared from potassium ferricyanide, polyvinylpyrrolidone, and manganese salts. This invention utilizes the color change of hollow manganese dioxide in relation to TMB to construct a method for detecting hepatitis biomarkers using a smartphone to capture signals. This kit reduces the detection cost of hepatitis biomarkers, does not require large instruments, and is highly portable and widely applicable, possessing great potential as a novel point-of-care testing device.

The invention provides a high-entropy nano enzyme. The chemical formula of the high-entropy nano enzyme is Mn < 0.4 > Co < 0.4 > Ni < 0.4 > Cu < 0.4 > Zn < 0.4 > Fe < 2.0 >) O. The invention also provides a preparation method of the high-entropy nano-enzyme, which comprises the following steps: dissolving manganese nitrate tetrahydrate, cobalt nitrate hexahydrate, nickel nitrate hexahydrate, copper nitrate trihydrate, zinc nitrate hexahydrate and sodium citrate in deionized water to prepare a clear solution A; dissolving potassium ferricyanide in deionized water to prepare a clear solution B; directly pouring the solution B into the solution A, stirring, standing and aging the obtained mixed solution at room temperature, and centrifugally collecting a product; and calcining the sample powder in a muffle furnace to obtain the high-entropy nano-enzyme. The invention further provides a catalyst which is composed of the high-entropy nano enzyme, 3, 3 ', 5, 5'-tetramethyl benzidine and H2O2. The invention also provides a method for detecting reduced glutathione by using the microfluidic paper chip analysis device. The invention provides a new normal form for constructing a multifunctional biosensing and environment monitoring platform.

The invention relates to the technical field of sodium ion battery negative electrode materials, and discloses a preparation method and application of a copper-iron sulfide nitrogen-doped porous carbon composite material, and the preparation method comprises the following steps: (1) mixing copper salt, potassium ferricyanide, a nitrogen source and polyethylene glycol, and carrying out ball milling to obtain a copper-iron Prussian blue precursor; (2) pyrolyzing the copper-iron Prussian blue precursor in an inert atmosphere, washing to remove impurities, and drying to obtain an intermediate product; and (3) carrying out heat treatment on the intermediate product and a sulfur source in an inert atmosphere to obtain the copper-iron sulfide / nitrogen-doped porous carbon composite material. Through the synergistic effect of compounding of the bimetallic sulfide and the nitrogen-doped porous carbon, sodium ions with larger ion radiuses are more easily embedded and deembedded in interlayer spacing, and meanwhile, abundant active sites are provided to enhance the storage of the ions, so that the lithium ion battery has outstanding rate capability and stable cycle performance.

The invention relates to the technical field of oxygen free radical detection, in particular to a manufacturing process of a portable and reliable oxygen free radical detector. Comprising the following steps: mixing superoxide dismutase, potassium ferricyanide, an isothiazolinone preservative, hexammine ruthenium chloride, polyethylene glycol octylphenol ether, trehalose and bovine serum albumin, and uniformly stirring to prepare an enzyme preparation; mixing an enzyme preparation with the high polymer material solution to form reagent layer slurry with viscosity; uniformly coating the reagent layer slurry on a substrate material, and drying; printing an electrode material on the substrate material to form a working electrode and a counter electrode; the silver electrode is placed in an electrolyte containing chloride ions, potential is applied, the silver surface is subjected to a chlorination reaction, and a silver / silver chloride electrode is formed; covering the reagent layer above the electrode, tightly combining the reagent layer with the electrode in a sticking or hot pressing manner, and cutting to obtain the test paper; the prepared portable oxygen free radical detector can be used for conveniently and efficiently detecting oxygen free radicals of a human body at low cost.

The invention provides a method for reducing the diameter of a tungsten filament of tungsten filament screen cloth, which reduces the risk of injury to operators and is good in environmental friendliness. The size precision control of the tungsten filament reducing process is high; the corrosion degree of equipment is reduced, and the maintenance cost is reduced. The method is characterized in that a mixed solution containing potassium ferricyanide, potassium hydroxide and deionized water is adopted as an etching solution for reducing the tungsten filament, the mass percent of potassium ferricyanide in the etching solution is 5%-20%, and the mass percent of potassium hydroxide in the etching solution is 3%-10%.

The invention provides an electrode for detecting protein substances, a preparation method of the electrode, a biosensor and a microflow detector. The electrode comprises a carbon electrode, a Prussian blue layer and a gold nanoparticle layer which are stacked in sequence, the side, away from the Prussian blue layer, of the gold nanoparticle layer is modified with an aptamer, the particle size of gold nanoparticles of the gold nanoparticle layer ranges from 20 nm to 100 nm, and the mass of the gold nanoparticles on the Prussian blue layer per unit area ranges from 4 micrograms / cm < 2 > to 5 micrograms / cm < 2 >; the Prussian blue layer is formed on one side of the carbon electrode by adopting a cyclic voltammetry method, the cyclic voltammetry method adopts a three-electrode system to perform continuous scanning for 20-40 circles in a potential range of-0.2 V-0. 9V, an electrolyte comprises 5-25 mM of potassium ferricyanide, 5-25 mM of ferric chloride, 0.12-0.25 M of hydrochloric acid, 5-50 mM of potassium chloride and the balance of water, and the molar ratio of the potassium ferricyanide to the ferric chloride is 1: 1. The electrode has more excellent sensitivity and stability, and detection of pg / mL-magnitude ultralow-concentration protein substances is realized.

The present application relates to wastewater treatment technical field, provide a kind of physicochemical method for treating acid etching waste liquid and potassium ferricyanide waste liquid simultaneously, comprising the following steps: S1.diluted after adding water in part etching waste liquid, add iron oxide, react for a period of time;Then add iron powder, after a period of time, add hydrochloric acid, after filtration separation, obtain metal copper and filtrate;S2.mixture of remaining etching waste liquid and biomass material is treated after using equal volume impregnation method, at 300-500 DEG C, under mixed protective atmosphere, calcine for a period of time;Then again at 600-1100 DEG C, under nitrogen atmosphere, calcine for a period of time;Iron-based carbon material is prepared;S3.iron-based carbon material, filtrate is directly mixed with potassium ferricyanide wastewater, react for a period of time, after filtration, evaporation, crystallization treatment can enter biochemical treatment system;It can realize the efficient recovery of metal copper, while the removal efficiency of ferricyanate in potassium ferricyanide wastewater is high, realizes waste treatment with waste, and the degree of resource utilization is high.

The application relates to the technical field of sodium ion battery negative electrode materials, and discloses a preparation method and application of a copper-iron sulfide / nitrogen-doped porous carbon composite material, which comprises the following steps: (1) mixing copper salt, potassium ferricyanide, a nitrogen source and polyethylene glycol, and obtaining a copper-iron Prussian blue precursor after ball milling; (2) pyrolyzing the copper-iron Prussian blue precursor under an inert atmosphere, washing and removing impurities, and drying to obtain an intermediate product; and (3) heat-treating the intermediate product and a sulfur source under an inert atmosphere to obtain a copper-iron sulfide / nitrogen-doped porous carbon composite material. Through the synergistic effect of the double-metal sulfide and the nitrogen-doped porous carbon composite, sodium ions with a larger ion radius can be more easily embedded and de-embedded in the interlayer spacing, meanwhile, abundant active sites are provided to enhance ion storage, so that the sodium ion battery has outstanding rate performance and stable cycle performance.

The invention relates to the technical field of sodium ion battery negative electrode materials, and discloses a preparation method and application of a multi-confinement iron-tin Prussian blue derivative sulfide carbon composite material, and the preparation method comprises the following steps: (1) adding a tin salt and a surfactant into a mixed solution of water, absolute ethyl alcohol and hydrochloric acid to prepare a solution A; (2) adding a potassium ferricyanide aqueous solution into the solution A, stirring, transferring into a reaction kettle, and carrying out solvothermal reaction to obtain an iron-tin prussian blue analogue; (3) dissolving the iron-tin Prussian blue analogue and a high-molecular polymer in N, N-dimethylformamide to form a spinning solution; and then carrying out electrostatic spinning, pre-oxidation, carbonization and sulfuration treatment in sequence to obtain the iron-tin Prussian blue derivative sulfide carbon composite material. According to the invention, the iron-tin Prussian blue analogue is encapsulated in the one-dimensional porous carbon nanofiber to form a spatial confinement, so that the volume change and stress of the active material in the charge-discharge process are effectively relieved, and the overall electrochemical performance is improved.

The application discloses an anti-caking salt product and a preparation method thereof. The anti-caking salt product comprises raw salt and an anti-caking agent, the anti-caking agent is food-grade ferric tartrate, and the addition amount of the anti-caking agent is 0.05-0.106 g / kg of the salt. The core of the anti-caking method of the salt lies in that the food-grade ferric tartrate is used as the main anti-caking agent, the addition amount is 0.05-0.106 g / kg of the salt, the salt is dried at 100 DEG C for 4 hours, then the anti-caking agent is added, and the water vapor transmission rate is less than or equal to 0.5 g / m 2 24h of high-barrier material packaging, while 6 g of quicklime or 2 g of calcium chloride desiccant is added in every 200 g of the salt. The application also controls the Mg 2+ content in the salt to be less than or equal to 0.02%, the KCl content to be less than or equal to 10%, and the particle size to be in the range of 0.45-0.6 mm, so that the salt caking is synergistically inhibited from multiple dimensions. The method has extremely significant anti-caking effect (the caking rate is only 8.7% after 15 days of open storage), is safe and economical, and has a simple process, and can effectively replace or reduce the use of potassium ferrocyanide, and is suitable for large-scale industrial production.

The invention relates to the technical field of photocatalysis, in particular to a strontium bismuth vanadium oxide photocatalyst and a preparation method and application thereof.The chemical formula of the photocatalyst is Sr3. 59Bi19.41 V4O42, the crystal structure of the photocatalyst belongs to an orthorhombic system, the space group of the photocatalyst is Immm, and the photocatalyst is of a unique layered structure composed of cation triple plate layers; the photocatalyst is synthesized by a molten salt method, and shows the activity of photocatalytic decomposition of water to produce oxygen under visible light. The preparation method comprises the following steps: mixing and grinding SrO, Bi2O3 and VO precursors with a molten salt medium, and then carrying out temperature programming calcination to synthesize a target product; the catalyst prepared by the method has the characteristics of high crystallinity, few defects and regular morphology, the photocatalytic oxygen production performance of the catalyst is remarkably superior to that of a same-component sample synthesized by a traditional solid-phase method, and photocatalytic water decomposition and oxygen production can be realized by taking a silver nitrate, ferric nitrate, ferric chloride or potassium ferricyanide aqueous solution as a sacrificial agent system under the irradiation of visible light with the wavelength of more than or equal to 420 nm.

The invention discloses an aluminum-doped Prussian blue nano-enzyme, which has high peroxidase-like activity, and a preparation method of the aluminum-doped Prussian blue nano-enzyme comprises the following steps: 1) uniformly stirring and mixing polyvinylpyrrolidone, aluminum nitrate, potassium ferricyanide and hydrochloric acid to obtain a mixed solution; and 2) heating the mixed solution to react, centrifuging, washing with ultrapure water, and drying to obtain the Al-doped Prussian blue nano-enzyme with high peroxidase-like activity. The invention further discloses a glutathione content detection method constructed based on the aluminum-doped Prussian blue nano-enzyme, and the method is used for carrying out simple colorimetry or constructing a paper-based intelligent equipment sensing platform and is used for immediate detection of glutathione. The method disclosed by the invention is simple and rapid to operate and low in cost, and a new detection method is provided for instant detection of glutathione in a complex sample.

The application discloses a synthesis method of a foamed nickel loaded iron-nickel-phosphorus C3N4 electrocatalytic material, and specifically comprises the following steps: S1, potassium ferricyanide, citric acid and C3N4 are weighed respectively and added into deionized water, and magnetic stirring is performed through a magnetic stirrer until complete dissolution; S2, 2cm*2cm foamed nickel is cut, surface impurities are washed away, and the treated foamed nickel is dried in a vacuum oven at 70 DEG C for 6h, and the dried foamed nickel is placed in the solution prepared in S1, and the reactor is sealed; S3, the foamed nickel in S2 is dried in a vacuum oven at 70 DEG C for 12h, is placed in the upstream of a porcelain boat, 450mg-550mg sodium hypophosphite is weighed and placed in the downstream of the porcelain boat, the porcelain boat is placed in the middle position of a tube furnace, and the foamed nickel is subjected to phosphating reaction in an argon atmosphere, the reaction temperature is controlled to be 345-355 DEG C, the reaction time is controlled to be 115-125min, and the foamed nickel loaded iron-nickel-phosphorus / C3N4 electrocatalytic material is obtained after the reaction is completed. The foamed nickel surface participates in the formation of a metal organic compound, so that the performance of the material is improved, and the service life of the material is prolonged.

This invention relates to a metal-organic framework-derived copper ferrite-based hydrogen sulfide gas-sensitive element and its preparation method, belonging to the field of gas-sensitive element preparation technology. The invention first involves reacting polyvinylpyrrolidone with hydrochloric acid solution and potassium ferricyanide. After the reaction, the mixture is washed and dried. The resulting blue precipitate is then reacted with copper acetate in an organic solvent. The resulting powder is then subjected to a heat treatment to obtain the metal-organic framework-derived copper ferrite material. The gas-sensitive element prepared from the copper ferrite material of this invention exhibits excellent adsorption and reactivity for hydrogen sulfide gas, which helps to solve the problem of hydrogen sulfide poisoning and improves the sensitivity and selectivity of the element. Furthermore, it features a simple preparation process.

This invention discloses a copper hexacyanoferrate-potassium heptacopper sulfide composite electrode material, its preparation method, and its application, belonging to the field of electroanalytical sensing material preparation technology. This invention uses a hydrothermal synthesis method to prepare potassium heptacopper sulfide. Subsequently, the potassium heptacopper sulfide-modified electrode is placed in an electrolyte solution containing potassium ferricyanide, and in-situ electrosynthesis is performed using cyclic voltammetry. This allows the hexacyanoferrate ions and copper ions present in the electrolyte to react and generate water-insoluble copper hexacyanoferrate, which grows in situ on the electrode surface, resulting in the copper hexacyanoferrate-potassium heptacopper sulfide composite electrode material. In this material, potassium heptacopper sulfide serves as a conductive substrate, and copper hexacyanoferrate serves as a redox probe. This composite electrode material can be used to construct an electrochemical sensor containing a molecularly imprinted layer, which exhibits high sensitivity, high specificity, a wide detection range, and good stability.

This invention belongs to the field of high-entropy transition metal coordination polymer technology, specifically relating to a high-entropy Prussian blue material, its preparation method, and its applications. The invention involves dissolving various hydrated inorganic metal salts and sodium citrate complexing agent in water, slowly adding potassium ferricyanide solution dropwise to this solution, and then stirring for 30 min. The resulting solution is allowed to settle at room temperature for 24 h, washed three times by centrifugation with deionized water, and then washed three times by centrifugation with ethanol to obtain the high-entropy Prussian blue material Cu. 0.2 Ni 0.2 Co 0.2 Mn 0.2 Zn 0.2 (Fe(CN)6) 0.667 This invention yields a high-entropy Prussian blue electrocatalyst that is simple to synthesize, structurally stable, and uses readily available raw materials. This electrocatalyst can be applied to the electrocatalytic reduction of nitrate, laying the foundation for developing other high-entropy transition metal coordination compounds with framework structures as electrocatalysts for the electrocatalytic synthesis of value-added chemicals from nitrate.

The invention discloses a copper-iron prussian blue / graphene oxide composite electro-catalysis cathode and a preparation method thereof. The method comprises the following steps: dissolving copper chloride, single-layer graphene oxide powder, citric acid and sodium citrate in water by adopting a one-step coprecipitation method, heating in a water bath, carrying out a heat preservation reaction to form a copper source precursor solution, mixing the copper source precursor solution with a potassium ferricyanide solution, carrying out heat preservation aging, taking the precipitate, carrying out centrifugal washing, drying and grinding to obtain catalyst powder, and drying the catalyst powder to obtain the single-layer graphene oxide / potassium ferricyanide composite catalyst. Finally, the powder and PVDF are mixed and dissolved in NMP, hydrophilic carbon cloth is coated with the mixture, and the copper-iron prussian blue / graphene oxide composite electro-catalysis cathode is prepared. The preparation process is simple, mass production can be achieved, the prepared composite electro-catalysis cathode has efficient hydrogen peroxide production capacity and in-situ Fenton catalysis capacity, active oxygen species can be effectively generated for organic pollutant degradation, and the application potential of a Prussian blue analogue material in the field of water treatment is greatly improved.

The invention provides application of carbon paste containing potassium ferricyanide in preparation of electrochemical test paper, the electrochemical test paper for creatinine detection, a device and a method, and relates to the technical field of biological detection. The research of the inventor finds that when the carbon paste containing potassium ferricyanide is used for preparing the electrode, the reaction activity of the conductive material carbon paste can be improved, and the sensitivity and the test linear range of the creatinine sensor are remarkably improved. The electrochemical test paper provided by the invention is low in cost, the electrode is prepared from the carbon paste containing potassium ferricyanide, and the electrochemical test paper is good in detection sensitivity and accuracy. The creatinine detection method provided by the invention is simple to operate, the sensor is activated in a pulse excitation mode and then detected, and the detection consistency is good.