116 results about "Ferricyanide" patented technology

PQQGDH having an improved substrate specificity or having an improved specific activity in an assay system using ferricyanide ion as a mediator is provided. Modified PQQGDH having the enhanced substrate specificity by introducing an amino acid mutation in a particular region of PQQGDH, and a method of enhancing the specific activity compared with a wild type in the assay system using the ferricyanide ion as the mediator by deleting, substituting, or adding one or more amino acids in an amino acid sequence of the wild type pyrroloquinoline quinone dependent glucose dehydrogenase.

The invention provides a method for synthesizing a high-sodium iron-based Prussian blue electrode material. The high-sodium iron-based Prussian blue electrode material comprises the following raw materials in percentage by mole: 25-43 percent of iron ion-containing metal salt, 25-43 percent of ferricyanide ion-containing metal salt and 14-50 percent of a complexing agent. The method comprises the following steps: 1, adding the iron ion-containing metal salt and the complexing agent into a container according to the ratio of the raw materials, adding a solvent, mixing, thereby obtaining a solution A; 2, adding the ferricyanide ion-containing metal salt into the container according to the ratio of the raw materials, adding the solvent, mixing, thereby obtaining a solution B; 3, mixing the solution A and the solution B, and reacting for 2-24 hours; and 4, respectively washing the obtained materials for several times by using water and ethanol, removing the impurities, drying, thereby obtaining the high-sodium iron-based Prussian blue electrode material. The obtained material serves as a sodium ion battery cathode material and has excellent electrochemical performance. The method is low in cost, readily available in raw materials, simple in process and easy for industrial production.

A method is provided for synthesizing sodium iron(II)-hexacyanoferrate(II). A Fe(CN)₆ material is mixed with the first solution and either an anti-oxidant or a reducing agent. The Fe(CN)₆ material may be either ferrocyanide ([Fe(CN)₆]⁴⁻) or ferricyanide ([Fe(CN)₆]³⁻). As a result, sodium iron(II)-hexacyanoferrate(II) (Na_1+XFe[Fe(CN)₆]_Z.MH₂O is formed, where X is less than or equal to 1, and where M is in a range between 0 and 7. In one aspect, the first solution including includes A ions, such as alkali metal ions, alkaline earth metal ions, or combinations thereof, resulting in the formation of Na_1+XA_YFe[Fe(CN)₆]_Z.MH₂O, where Y is less than or equal to 1. Also provided are a Na_1+XFe[Fe(CN)₆]_Z.MH₂O battery and Na_1+XFe[Fe(CN)₆]_Z.MH₂O battery electrode.

The invention discloses an aqueous electrolyte rechargeable zinc ion battery, belonging to the technical field of battery preparation. The battery disclosed herein is characterized in that: the cathode active material mainly comprises zinc ions (Zn<2+>)- intercalated and -removed copper (nickel) ferricyanide, the anode active material mainly comprises zinc, and the electrolyte which is liquid or gel comprises soluble salts of zinc as the solute and water as the solvent. According to the invention, the zinc ions can be intercalated in the copper (nickel) ferricyanide cathode material lattices or be removed from the copper (nickel) ferricyanide cathode material lattices, simultaneously the anode material mainly comprising zinc is subject to oxidation or reduction, thus the battery has the characteristics of high specific capacity and rapid charging, and the battery can be widely applied in the fields of portable mobile terminal, equipment, miniature electric vehicle and automobile starting battery, etc.

The invention provides preparation of a Prussian blue photo-Fenton catalyst; ferric trichloride, ferric nitrate, ferric sulfate or ammonium ferrous sulfate, potassium ferricyanide, and potassium ferrocyanide are used as raw materials, and are dissolved in ultrapure water respectively to prepare a solution containing iron ions and ferricyanide ions; molecular sieve, kaolin or construction waste are used as carriers, and Prussian blue is fixed on the carriers to obtain fixed Prussian blue photo-Fenton catalyst. The invention also provides a method for degrading organic pollutants by the Prussian blue photo-Fenton catalyst, which comprises mixing of the prepared photo-Fenton catalyst with hydrogen peroxide under a light condition to degrade organic simulated pollutants. The method of the invention is simple and practical; the catalyst is suitable for recycle, can both effectively remove chroma of polluted water, and reduce COD of the polluted water.

A voltaic cell comprising an iron in alkali anode where metal iron is oxidized to iron II hydroxide and a ferricyanide in alkali cathode where ferricyanide is reduced to ferrocyanide, and uses thereof.

A dry reagent composition that includes an active redox enzyme that oxidizes an analyte as a specific substrate to produce an inactive reduced form of the enzyme; and a salt of ferricyanide provides improved performance in electrochemical test strips such as those used for detection of glucose. The salt of ferricyanide consists of ferricyanide and positively-charged counter ions, and the positively charged counter ions are selected such that the salt of ferricyanide is soluble in water, and such that the salt of ferricyanide or the crystalline phase of the salt of ferricyanide has a solubility in water and/or a lower E⁰_eff at a concentration of 100 mM than potassium ferricyanide. For example, the salt of ferricyanide may be tetramethylammonium ferricyanide.

The invention relates to the field of alkaline redox flow battery energy storage, in particular to a preparation method of an ion exchange membrane for an alkaline redox flow battery, which is mainlyused for solving the problem of the high price of a Nafion diaphragm in the alkaline redox flow battery at the present stage, so that the cost of the redox flow battery is greatly reduced. An alkalineaqueous solution of ferricyanide (such as Na3[Fe(CN)6], K3[Fe(CN)6], (NH4)3[Fe(CN)6] and the like) is used as a positive electrolyte, and a strong alkaline solution (such as KOH, NaOH and the like) is used as a negative electrolyte; graphite felt and carbon felt are selected as positive electrode materials, and a zinc plate is selected as a negative electrode material; and the ionized sulfonatedpolyether ether ketone (SPEEK) diaphragm is used as an ion exchange membrane to assemble the battery. Therefore, the alkaline redox flow battery system with low cost and high performance is obtained.The flow battery system provided by the invention has the advantages of the high open-circuit voltage, the low cost, the high efficiency, the good cycling stability, safety, reliability and the like,and has a wide application prospect.

The present invention relates to a continuous bipolar electrochemically based reactor for the purpose of destroying free cyanide by direct and indirect oxidation and removing its strong complexes like ferrocyanide and ferricyanide by electrocoagulation. The designed reactor consists of four main sections, including electrooxidation, hydraulic mixing, electrocoagulation, and precipitation tank. The order of sections results in having a combination of reactions which separately remove cyanide and its compounds. The designed reactor shows a high flexibility in terms of handling highly variable kinds and concentrations of cyanide in the industrial wastewater effluents.

The invention provides a method for measuring the electroactive area of a three-dimensional porous membrane electrode, which comprises the steps of: respectively measuring cyclic voltammetry curves under different scanning speeds in potassium cyanide-containing and potassium cyanide-free kali salt or sodium salt solution with a three-electrode system and a potentiostat by taking a three-dimensional porous electrode or the three-dimensional porous membrane electrode which is deposited with a transition element ferricyanide semiconductor membrane, and measuring the electroactive area and the cover degree thereof with the reversibility of the redox reaction of the membrane electrode in different solution systems; and obtaining the active volume and the average membrane depth of the inner membrane of the three-dimensional porous membrane electrode by combining with the chronocoulometry. The method is simple and reliable, and has strong practicability.

A process for preparing the electroactive ion-exchanging nickel ferricyanide membrane used to treat the industrial sewage containing alkali metal ions includes generating a capillary gap between electrically conductive substrate and film, filling the solution prepared from potassium ferriccyanide, 2-valence Ni salt, Na salt and water into said gap, laying aside for chemical depositing and removing film.

The invention discloses a preparation method for single-structure ferricyanide film monopolar pulse electro-deposition, which adopts a monopolar pulse electro-deposition method to prepare semi-conductive metal ferricyanide film on the surface of a conductive matrix, i.e. feeds a certain period of pulse deposition voltage and then controls the current to be zero within the interruption time to realize monopolar pulse, and prepares soluble or insoluble single-structure inorganic semi-conductive metal ferricyanide film by regulating the pulse voltage, pulse frequency, pulse make-break time (duty ratio) and other parameters in the solution containing potassium ferricyanide, transition metal salt and supporting electrolyte. The preparation method is simple and has strong operability; and the prepared single-structure metal ferricyanide film has excellent selectivity and sensitivity, and is the preferred material for the preparation of sensitive sensors and the electrical control ion separation technology.

The invention relates to a method for removing heavy metal by carrying out cyanide breaking on high-concentration cyanide wastewater. The method comprises the following steps: (1) feeding the high-concentration cyanide wastewater into an electrolytic bath, and carrying out electrolysis by using a direct current power supply under an alkaline condition; (2) in the electrolytic process, enabling content of cyanide to be gradually reduced, adding hydrogen peroxide to improve a reaction speed of the cyanide, and finally, carrying out electrolysis to obtain low-concentration cyanide wastewater; (3) regulating a pH value of the low-concentration cyanide wastewater obtained in the step (2) into 10 to 11, and adding EDTA (Ethylene Diamine Tetraacetic Acid) and a catalyst to perform reaction; (4) adding hydrogen peroxide into solution obtained in the step (3) to carry out deep cyanide breaking treatment; (5) for the wastewater subjected to complete cyanide breaking and obtained in the step (4), removing heavy metal in the solution by adopting a ferrite method. The method is simple to operate; not only is high-concentration cyanide removed, but also the wastewater subjected to cyanide breaking is subjected to deep treatment; particularly, ferricyanide reaches an emission standard.

The invention especially related to electrochemical method for measuring effective density of hole in anodic aluminum oxide (AAO) template. Usual three-electrode system and potentiostat are adopted in the method. Working electrode is dish electrode of metal platinum (or gold, glassy carbon), and there is electrode of AAO template. Ferricyanide is as solution. Na2SO4 or KCl is as electrolyte. Using diffusibility of ferricyanide on surface of working electrode, the method measures effective density of hole in AAO template by using electrochemical voltmeter-ammeter method. Features are: simple method and good reliability.

The invention discloses a preparation method of a multi-purpose in-level oil-water separation material. The preparation method comprises the following steps: preparing a porous reticular Cu film by adopting a hydrogen bubble template; preparing an ionic imprinted polymer coating on the surface of the porous reticular Cu film, and imprinting ferricyanide(FCN) as counter ions of metal ions into polypyrrole (PPy) to prepare an FCN/PPy composite film coating. The area of a substrate of the multi-purpose in-level oil-water separation film prepared by the method provided by the invention is 3*3cm<2>, the bore diameter of the porous reticular film is 100-500 micrometers, the second-level bore diameter, namely the bore diameter of a porous structure plated on the reticular substrate is 10-120 micrometers, the ionic imprinted polypyrrole coating is cauliflower-shaped, the bore diameter of small particles is 100-800 nm, and the bore diameter of large bulges is 1-8 micrometers. The multi-purpose oil-water separation film prepared by the method provided by the invention has superoleophobic property underwater, has effective self-cleaning function, and also has excellent mechanical stability.

The invention relates to a method for preparing chitosan immobilized Lewis acidic ionic liquid and DCPP synthesized by using chitosan immobilized Lewis acidic ionic liquid in presence of high-efficient catalyst. The method is characterized by comprising the following steps: performing refluxing reaction on 1-methylimidazole and Y-chloropropyl trimethoxy silane in a mol ratio of 1:1 at a temperature of 70 DEG C for 70 hours; then performing reaction in a mol ratio of Lewis acid anhydrous ferric chloride to a prepared product of 2:1 at a temperature of 70 DEG C for 24 hours; dispersing the obtained ionic liquid containing ferricyanide and chitosan which is 2 times of the ionic liquid in mass in acetonitrile to reflux for 20 hours; performing rotary evaporation to remove a solvent; and performing soxhlet extraction on the obtained solid with methylene dichloride for 30 hours to obtain a chitosan immobilized acidic ionic liquid catalyst PmimCl-FeCl3-CS. Anhydrous aluminum chloride and indium chloride are used for replacing anhydrous ferric chloride and serve as a Lewis acid in turn to obtain PmimCl-AlCl3-CS and PmimCl-InCl3-CS respectively. The method has the advantages of low-price and readily available reaction raw materials, mild reaction and simple condition.

The invention relates to a method for extracting gold through potassium ferricyanide. The method is characterized in that the gold is extracted from the auriferous ores under an alkaline environment at normal temperature and pressure with nontoxic ferricyanide serving as a gold leaching agent and calcium peroxide serving as a leaching adding agent; and the method is a completely novel cyanide-free gold leaching method. According to the method, some auriferous ores which are difficultly treated are preprocessed and then leached for 2 to 20 hours at a normal-temperature alkaline environment and under the conditions that the concentration of potassium ferricyanide is 2 to 15%, the dosage of CaO2 is 1 to 10g/L and the liquid-solid ratio is 2: 1 to 10: 1; and the leaching rate of the gold can reach more than 94%. The method is simple and reliable in process and high in gold leaching rate and nearly not pollutes the environment; the reaction is carried out at the alkaline environment, so that equipment is nearly not corroded, and the requirement and cost are low, and the method has an important industrial application prospect.

The invention belongs to the field of nano materials, and discloses an atomic-scale iron active site catalyst as well as a preparation method and application thereof. The preparation method provided by the invention comprises the following steps: 1) preparing ferricyanide dimethylimidazole ionic liquid; 2) constructing a core-shell structure precursor with uniformly dispersed iron ions; and 3) preparing the atomic-scale iron active site catalyst. The atomic-scale iron active site catalyst obtained by the preparation method disclosed by the invention is microporous nanospheres loaded with atomic-scale iron active sites comprising Fe-N4 ligands and Fe3 clusters. The catalyst is low in density, high in stability and resistant to acid and alkali corrosion; porous properties are also exhibited;the reaction activation energy can be greatly reduced, the electron/ion transfer and the mass transfer rate of an intermediate product are accelerated, and thus, the catalytic activity and the cycling stability of the catalyst are improved, and the maximum atom utilization rate (100%) is realized; and the catalyst is suitable for being used as a catalyst material for electrocatalytic oxygen reduction (ORR) and oxygen evolution (OER) reactions in fuel cells and metal-air cells.

The invention relates to a method for detecting acetamiprid based on nickel-ferricyanide complex nanoparticles as an indication probe. The problems of high cost and poor selectivity of existing acetamiprid detection methods and the problems of tedious operation, high price and long time caused by electroactive group labeling of aptamer or addition of an electroactive substance into a test system in the construction process of previous electrochemical aptamer sensors for acetamiprid are solved. The nickel-ferricyanide complex nanoparticles used as the indication probe are deposited on the surface of an electrode in situ, and a highly-sensitive electrochemical analysis technology is effectively combined with a high-affinity nuclear aptamer to construct an electrochemical aptamer sensor for acetapamidine. The method realizes highly sensitive analysis of the acetamiprid and obtaining of high selectivity in a complex environment medium, has the advantages of simple device, low analysis costand fast response, and provides a new detection method for assessing the pesticide acetamiprid residues in foods and the environment.

A transition metal hexacyanoferrate (TMHCF) battery electrode is provided with a Fe(CN)6 additive. The electrode is made from AxMyFez(CN)n.mH2O particles overlying a current collector, where the A cations are either alkali and alkaline-earth cations such as sodium (Na), potassium (K), calcium (Ca), or magnesium (Mg), and M is a transition metal. A Fe(CN)6 additive modifies the AxMyFez(CN)n.mH2O particles. The Fe(CN)6 additive may be ferrocyanide ([Fe(CN)6]4-) or ferricyanide ([Fe(CN)6]3-). Also provided are a related TMHCF battery with Fe(CN)6 additive, TMHCF fabrication process, and TMHCF battery fabrication process.

A transition metal hexacyanoferrate (TMHCF) battery electrode is provided with a Fe(CN)₆ additive. The electrode is made from A_xM_yFe_z(CN)_n.mH₂O particles overlying a current collector, where the A cations are either alkali and alkaline-earth cations such as sodium (Na), potassium (K), calcium (Ca), or magnesium (Mg), and M is a transition metal. A Fe(CN)₆ additive modifies the A_xM_yFe_z(CN)_n.mH₂O particles. The Fe(CN)₆ additive may be ferrocyanide ([Fe(CN)₆]⁴⁻) or ferricyanide ([Fe(CN)₆]³⁻). Also provided are a related TMHCF battery with Fe(CN)₆ additive, TMHCF fabrication process, and TMHCF battery fabrication process.

The invention discloses a manufacturing method of a secondary iron-based composite-copper ferricyanide battery, the manufacturing method comprises the steps of: (1) preparing an iron-based composite; (2) preparing a battery negative electrode sheet; (3) preparing a battery positive electrode sheet; (4) assembling a iron-based composite-copper ferricyanide battery. In the invention, the iron-based composite is used as a negative electrode, the copper ferricyanide is used as a positive electrode and an electrolyte is an acidic solution. The negative electrode of the new type battery is a composite with iron as the main component, and has relatively good stability in the acidic solution to avoid spontaneous discharge of the battery; the positive electrode of the battery is the copper ferricyanide, which is stable in the acidic solution and has excellent redox properties. When the battery is discharging, the negative electrode is a process of forming metal ions by the iron-based composite and the positive electrode is a process of forming copper ferrocyanide by the copper ferricyanide. When the battery is charging, the metal ions are deposited on the negative electrode and the copper ferrocyanide in the positive electrode is reduced to be the copper ferricyanide.

The invention discloses Prussian blue as well as a preparation method and application thereof. The prussian blue is prepared by taking ferricyanide and ferrous salt as iron sources and carrying out complex reaction in the presence of citrate and an antioxidant. The Prussian blue crystal form is complete, vacancy and structural water are less or the Prussian blue does not contain vacancy and structural water, the crystal structure is stable in the ion intercalation and deintercalation process, high reversible gram volume is given to the Prussian blue crystal form, ion diffusion is facilitated, and the Prussian blue crystal form has a good capacity retention rate characteristic under large current. The preparation method of the Prussian blue can ensure that the prepared Prussian blue is stable in structure and electrochemical performance, is high in efficiency, saves the production cost, does not generate toxic and harmful components, and is high in safety. Therefore, the Prussian blue can be applied as a positive electrode material.

The invention discloses a preparation method of metal organic framework compound adsorbent particles for extracting rubidium and cesium resources from salt lake brine, seawater and underground water. The adsorbent particles are prepared by taking a water-absorbing polymer as a carrier, adding transition metal ferrous ferrocyanide, potassium cobalt cyanide, potassium nickel ferrocyanide, potassium titanium ferrocyanide, potassium copper ferrocyanide, potassium cadmium ferrocyanide or other metal organic framework compound adsorbents in a high loading amount, and carrying out secondary cross-linking. The preparation process is simple and is suitable for industrial production. The prepared adsorbent particles have the characteristics of high elasticity, porosity, high water absorption, good permeability and the like. A resin matrix is resistant to strong acid, strong alkali and high-salt environments, the polyhydroxy structure on the surface of the matrix can effectively adsorb adsorbent particles, the solution loss rate is effectively reduced, the method can be applied to extraction of rubidium and cesium elements in salt lake raw brine, old brine, seawater and underground water resources, and meanwhile the high-strength corrosion-resistant matrix is suitable for an industrial adsorption column process.