256results about "Iron cyanides" patented technology

The invention discloses a preparation method of a CoMnFe-PBA hollow superstructure material, which combines seed induced self-assembly with an in-situ ligand / metal ion exchange growth method, and comprises the following steps: dissolving MOF-74 and potassium ferricyanide in deionized water, and carrying out ultrasonic treatment to form a solution A; dissolving polyvinylpyrrolidone, ferric chloride and manganese chloride tetrahydrate in a mixed solvent of ethanol and deionized water, and stirring for a certain time to obtain a solution B; dropwise adding the solution B into the solution A, stirring, carrying out centrifugal collection, ethanol washing and freeze drying on a reaction product, and collecting a sample to obtain the CoMnFe-PBA hollow superstructure material. According to the CoMnFe-PBA hollow superstructure material prepared through the method, a construction unit of a self-assembly superstructure is expanded to PBA nanoparticles, and the synthesis strategy, the construction unit, the structural level and the application range of the self-assembly superstructure can be further expanded.

The present invention discloses a preparation method and production system for sodium nitroprusside. The preparation process comprises the following steps: first, reacting ferrocyanide with nitric acid to obtain a hydrogen nitroprusside aqueous solution; adding alcohol to the concentrated hydrogen nitroprusside aqueous solution to remove inorganic salts generated by the reaction, thereby obtaining a hydrogen nitroprusside alcohol solution; then, adding trisodium citrate to the hydrogen nitroprusside alcohol solution to react to obtain sodium nitroprusside and disodium citrate; separating and removing the citrate to obtain a sodium nitroprusside alcohol solution; and finally, concentrating, crystallizing, separating, and drying the sodium nitroprusside alcohol solution to obtain a sodium nitroprusside product. The present invention also provides a production system based on the preparation method. The production method of the present invention is simple to operate, operates under mild conditions, has a short production cycle, effectively prevents product oxidation, and has high purity. The obtained product is suitable for industrial production, and the production system requires less equipment and has low equipment requirements.

The invention discloses a method for preparing a sodium-rich boundary-rich iron-based prussian blue analogue (FePBA) through one-step hydrothermal synthesis assisted by sodium thiosulfate. The method specifically comprises the following steps: preparing a solution A and a Na4Fe (I I) (CN) 6 solution; the molar ratio of ferrocyanide to Fe ions in the solution B is 3: 4. And preparing a solution B to react with ferrocyanide to form FePBA. Adding sodium citrate to form a sodium and citrate-rich environment, then adding ferric iron salt, and fully stirring to chelate the added Fe < 3 + > with the citrate; and adding sodium thiosulfate after the step. Preparing a PVP (Polyvinyl Pyrrolidone) solution to play roles in dispersing FePBA and reducing agglomeration, and taking the PVP solution as a solution C; slowly dropwise adding the solution A and the solution B into the solution C at a constant speed by using a rubber head dropper to finally obtain a precursor solution, carrying out hydrothermal reaction for 6 hours at 110 DEG C, carrying out suction filtration on the obtained precipitate, and drying to obtain a FePBA sample. According to the invention, the time required for synthesis is greatly shortened, and the traditional coprecipitation of more than 24 hours is improved into rapid hydrothermal reaction of 6 hours.

The invention provides a positive electrode material and a preparation method thereof, a positive electrode plate and a secondary battery, and belongs to the field of battery materials, the positive electrode material comprises an inner core and a composite coating layer coating the surface of the inner core; the inner core comprises lithium iron phosphate, and the composite coating layer comprises a carbon material and a metal oxide; wherein the metal oxide comprises at least one of lithium titanate, lithium manganate and lithium cobalt oxide. The carbon material and the metal oxide containing titanium, cobalt and manganese are compounded to serve as the composite coating layer to coat the lithium iron phosphate core, on one hand, the microstructure characteristics of the metal oxide containing titanium, cobalt and manganese are utilized, richer channels are provided for lithium ion diffusion, on the other hand, the high electron conductivity of the carbon material is utilized, and the lithium ion diffusion efficiency is improved. The prepared positive electrode material can simultaneously have relatively high electronic conductivity and lithium ion diffusion rate, and when the positive electrode material is used as a lithium ion battery, the charge-discharge performance and the cycle life of the lithium ion battery are remarkably improved.

The invention discloses a spherical Prussian blue material as well as a preparation method and application thereof. The preparation method comprises the following steps: enabling a mixed reaction system containing soluble transition metal hexacyanoid salt, soluble transition metal salt, a complexing agent, soluble sodium salt, a surfactant and a carbon sphere precursor to react, and then selectively performing or not performing aging treatment to prepare the spherical Prussian blue material. According to the preparation method provided by the invention, the spherical Prussian blue material is obtained by regulating and controlling the reaction raw materials and the reaction steps, so that the rate capability and the cycle stability of the Prussian blue material are improved, and the problem that the compaction density and the compaction density are reduced due to the fact that the rate capability of a Prussian blue cube is improved due to carbon coating is solved.

The invention relates to an iron-based Prussian blue positive electrode material and a preparation method and application thereof, the molecular formula of the iron-based Prussian blue positive electrode material is as follows: 0 < x < = 2, 0 < y < = 1, 0 < z < = 1, the iron-based Prussian blue positive electrode material is a hollow porous sphere structure formed by stacking cubic nanoparticles, the average particle size of the hollow porous sphere structure is 0.3-8 [mu] m, and the average particle size of the hollow porous sphere structure is 0.5-8 [mu] m. And the wall thickness of the hollow porous ball structure is 0.08 mu m-2 mu m. When the iron-based Prussian blue positive electrode material is used as a sodium ion battery positive electrode material, the iron-based Prussian blue positive electrode material has excellent rate capability and cycle performance.

The invention provides a process for removing cyanide from a cyanide-bearing aqueous fluid, the process comprising: (i) adding a solid composition comprising a first mixed-metal cyanide complex comprising copper and iron to a cyanide-bearing aqueous fluid comprising free cyanide and metal-complexed cyanide, wherein at least a portion of the first mixed-metal cyanide complex dissolves, with complexation of the copper by the free cyanide, to produce an aqueous solution comprising cyanometallates, the cyanometallates comprising copper cyanide and iron cyanide complexes derived from the first mixed-metal cyanide complex; (ii) contacting the aqueous solution with an anion-exchange absorbent to absorb the cyanometallates, thereby producing a cyanide-lean aqueous fluid; (iii) extracting the anion-exchange absorbent comprising the absorbed cyanometallates with at least one non-acidic aqueous extractant to produce an aqueous extract comprising the copper cyanide and iron cyanide complexes; and (iv) acidifying the aqueous extract to produce a precipitate comprising a second mixed-metal cyanide complex comprising copper and iron.

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 disclosure relates to an aqueous electrochemical device comprising a negative electrode, a positive electrode, a separator and an aqueous electrolyte having an alkaline pH, wherein onto the positive electrode is disposed at least one layer of nanoparticles capable of being used to form a local hydronium ion rich environment at the positive electrode during operation of the device, and / or the capacity ratio between the negative electrode and the positive electrode is less than 1 so as to substantially avoid production of oxygen at the positive electrode. The electrochemical device may find particular use in large-scale energy storage.

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 belongs to the technical field of sodium ion batteries, and particularly relates to a Prussian blue sodium battery positive electrode material and a preparation method thereof.The preparation method comprises the steps that anhydrous sodium ferrocyanide, anhydrous manganese sulfate and a NaA molecular sieve are mixed and preliminarily ground, and a precursor mixture is obtained; placing the precursor mixture in a planetary ball mill for ball milling to obtain a primary reaction product; and washing the preliminary reaction product, and carrying out vacuum drying to obtain the Prussian blue sodium battery positive electrode material. The method is low in material loss and short in generation period, and the prepared Prussian blue sodium battery positive electrode material is low in crystal water content and has good cycle stability.

The invention provides a colorful Prussian blue film as well as a preparation method and application thereof. The preparation method comprises the following steps: placing a conductive material coated with a metal layer on the surface in a Prussian blue precursor solution, and growing a Prussian blue film layer on the surface of the metal layer in situ to obtain a Prussian blue film layer-metal layer-conductive material layer complex, namely the colorful Prussian blue film. The invention provides a colorful Prussian blue film which is characterized in that a metal layer is sputtered on the surface of conductive glass, on one hand, the problem of poor adhesion between Prussian blue and the conductive glass is solved, and on the other hand, Prussian blue grows on the surface of the metal layer in situ, so that a potential difference is formed between metal and iron ions, and the Prussian blue film is obtained. Further, prussian blue grows on the surface of the metal layer layer by layer, the multi-color film can be constructed by utilizing different thicknesses of the prussian blue layer, and the color of the multi-color film can be changed under the driving of voltage, so that the color gamut of the multi-color film is further enriched; the technical scheme provided by the invention has universality, and the preparation method is simple, low in cost and wide in application prospect.

The invention belongs to the technical field of medicine synthesis, and discloses a preparation method of a sodium nitroprusside raw material medicine. According to the method, weak acid is adopted for catalysis, the effect of remarkably reducing generation of toxic substances such as cyanide and nitrogen dioxide is achieved by controlling the material dripping speed and the dripping pH, the reaction is mild, the technological operation is safe and controllable, and industrial production of the sodium nitroprusside raw material medicine is facilitated. According to the preparation method of some examples, silica gel filtration is used for post-treatment, the residual risk of impurities such as sodium ferricyanide, ferric ferrocyanide and ferric ferricyanide is reduced, and the purity of the raw material medicine is larger than or equal to 99.9% and is far superior to the requirements of pharmacopoeia of various countries.

The present disclosure provides Prussian blue cathode material and preparation method therefor, cathode sheet and sodium-ion battery. The Prussian blue cathode material includes a Prussian blue compound, and the Prussian blue compound has a general chemical formula of NaxFe[Fe(CN)6]y·nH2O. The Prussian blue cathode material provided by the present disclosure has a simple synthesis method and a low raw material cost, and when applied to a sodium-ion battery, is conducive to improving the performance of the sodium-ion battery in terms of specific capacity, coulomb efficiency, rate performance and long cycle stability, etc.

The invention discloses a lanthanide-doped Prussian blue positive electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: mixing and dissolving sodium ferrocyanide and lanthanide metal salt to obtain a mixed solution; and under a protective atmosphere, dropwise adding the mixed solution into a mixed chelating agent salt solution through a peristaltic pump, and reacting to obtain the lanthanide-doped Prussian blue positive electrode material. The lanthanide metal in the lanthanide-doped Prussian blue positive electrode material occupies the Na site, the single iron source coprecipitation method is adopted for synthesis, the process concentration is uniform, the synthesized positive electrode material has fewer defects, the material structure is stable, the rate capability is excellent, the specific capacity is high, and the application prospect is very good.

The invention belongs to the technical field of adsorption material preparation, and relates to an anion defect type prussian blue analogue and a preparation method and application thereof in cesium adsorption.The preparation method comprises the steps that imidazole and halogenated alkane are subjected to an alkylation reaction and anion exchange to prepare ionic liquid, and after water is added, an ionic liquid-water mixed solvent is obtained; the method comprises the following steps: respectively dissolving transition metal nitrate and potassium ferrocyanide into an ionic liquid-water mixed solvent, dropwise adding a potassium ferrocyanide solution into a transition metal nitrate solution, and stirring to obtain a mixed solution; and carrying out hydrothermal reaction on the mixed solution, cooling to room temperature, washing the material, and drying to obtain the anion defect type prussian blue analogue. The cesium ion adsorption capacity and the cesium ion cycling stability are improved by precisely regulating and controlling anion defects in the Prussian blue analogue, and the cesium ion adsorption material has good ion interference resistance in a complex water environment and shows excellent adsorption selectivity and a wide application range.

The application relates to the technical field of positive electrode materials, and particularly discloses a method for improving the crystallinity of Prussian blue, Prussian blue, a positive electrode material and a battery. The method for improving the crystallinity of Prussian blue comprises the following steps: mixing a low-crystallinity Prussian blue and its analogues, an aqueous solution of an alcohol compound, hexacyanoferrate (II) and a reducing substance to obtain a reaction solution; reacting the reaction solution at a temperature of 40-80 DEG C to prepare solid precipitates; and washing and drying the prepared solid precipitates to obtain high-crystallinity Prussian blue. The method utilizes a reducing environment, an aqueous solution of an alcohol compound and high-concentration Fe(CN)6 4‑ to promote the separation of crystal water in the material structure from the crystal coordination, Fe(CN)6 4‑ to enter the structure and combine with M (M=Fe, Mn, etc.) in the Prussian blue and its analogues, thereby reducing the vacancy and crystal water content in the structure. The crystallinity of the Prussian blue and its analogues is improved.

This invention discloses a method for preparing size-tunable porous Mn / Fe-based Prussian blue nanomaterials and their applications. This invention utilizes ion doping to prepare a series of uniformly tunable Prussian blue nanoporous materials by adjusting the ratio of Mn / Fe ions. The Prussian blue nanoporous materials prepared by this invention can activate H₂O₂ and rapidly degrade a 20 ppm ciprofloxacin solution within 20 min, exhibiting good cycling performance. This invention provides a simple one-step method for preparing size-tunable porous Mn / Fe-based Prussian blue nanomaterials, characterized by high economic efficiency and a simple preparation process, resulting in significant economic and environmental benefits.

The invention discloses a surface coating modification method of a Prussian blue analogue sodium ion battery positive electrode material, and the method comprises the following steps: S1, preparing a precursor solution; S2, pretreating a substrate; S3, carrying out in-situ non-hydrolytic sol-gel coating: dropwise adding a mixed solution obtained in the S1 into a dispersion liquid obtained in the S2, carrying out a stirring reaction in an inert atmosphere, and carrying out in-situ non-hydrolytic sol-gel coating to obtain the Prussian blue analogue sodium ion battery positive electrode material. The reaction temperature is controlled to be 50-80 DEG C, and the reaction time is 2-6 hours; and S4, heat treatment forming is conducted, and the modified PBA material with the surface coated with the aluminum-zirconium composite oxide layer is obtained. According to the modification method, a uniform and firm coating layer with specific composition and structure can be formed on the surface of PBA, so that the problems of structural stability and interfacial compatibility of PBA in electrochemical circulation are solved, and the comprehensive performance of the sodium ion battery is improved.

The present disclosure generally relates to a Prussian White particle having an inner core and an outer surface, wherein the Prussian White particle is defined by AaX1[X2(CN)6] 1-y⋅mH2O, wherein the Prussian White particle comprises a coating arranged on at least a portion of the outer surface, wherein the coating is defined by Naa'X3[X2(CN)6] 1-y'⋅mH2O, wherein A is Na or K, 1.8 < (a, a') ≤ 2, preferably 1.9 < (a, a') ≤ 2, more preferably 1.98 < (a, a') ≤ 2, 0 < (m, m') ≤ 3, 0 ≤ (y, y') ≤ 0.025, wherein X1 and X2 are selected from Fe and Mn, and wherein X3 is Mn, Ti, Ag, Co, and / or Al. The present disclosure also relates to a method for manufacturing the Prussian White particles, to a cathode comprising a plurality of Prussian White particles, and to an electrochemical energy storage device, preferably a battery cell comprising the cathode. Furthermore, the present disclosure relates to a method for manufacturing a cathode comprising the Prussian White particles.

The present invention discloses a Prussian blue-based sodium-ion battery positive electrode material, a preparation method, and applications thereof. The method comprises: mixing sodium ferrocyanide, oxalate, and a non-aqueous solvent, subjecting the mixture to a ball-milling reaction, and washing the product after the ball-milling reaction to remove unreacted raw materials and a portion of sodium oxalate generated by the reaction, thereby obtaining the Prussian blue-based sodium-ion battery positive electrode material. The present invention can synthesize Prussian blue-based compounds with low defects and low interstitial water molecule content, thereby improving the sodium storage performance and capacity utilization of such materials; it also reduces the probability of side reactions in the electrolyte causing cell bloating. In addition, the use of oxalate-based raw materials can also generate a sodium oxalate-based positive electrode sodium supplement during the synthesis of the Prussian blue-based compound, thereby replenishing sodium ion loss caused by SEI film formation or other side reactions during the initial charge.

This invention discloses a cathode material, its preparation method, and its application, belonging to the technical field of cathode materials for sodium-ion batteries. The cathode material has a core-shell structure, with a core of sodium manganese ferrocyanide and a shell of potassium manganese ferrocyanide; a manganese ferrocyanide intermediate layer is also present between the core and the shell. The intermediate layer contains Mn... 2+ The ionic radius is greater than that of the Na core. + Larger K atoms, with higher valence states, can reduce lattice spacing, thus supporting the structure and improving the material's cycling stability while inhibiting the absorption of water molecules; the K atoms in the outer shell... + Not only can it provide capacity, but also K + The ionic radius is also larger than that of Na. + Larger and wider ion transport channels result in a more stable structure, which also helps reduce the material's water absorption. The presence of the aforementioned intermediate layer and outer shell significantly improves the structural stability of the cathode material during charge and discharge, reduces side reactions between the cathode and electrolyte, and enhances interfacial stability, cycle performance, and rate performance.

The present invention belongs to the technical field of magnesium ion batteries, and specifically relates to a magnesium-manganese-based Prussian white material and its preparation method and application. The general formula of the magnesium-manganese-based Prussian white is K n Mg x Mn y [Fe(CN)6]·zH2O has a spherical structure, an average particle size of 50nm to 150nm, a water content of 0wt% to 8wt%, a magnesium content of 0.56wt% to 20wt%, and a manganese content of 20wt% to 45wt%. This magnesium-manganese-based Prussian white material has excellent structure and performance. When used as an electrode material for magnesium-ion batteries in a 0.5MMg(TFSI)2 / AN organic electrolyte and at a current density of 100mA / g, its specific capacity reaches as high as 153mAh / g; at a current density of 1A / g, its specific capacity can still be maintained at 60mAh / g. The material also features a simple production process, low cost, and high yield, making it suitable for large-scale industrial production.

The invention relates to a preparation method and antibacterial application of an adjustable manganese-based Prussian blue analogue. Through metal ion doping and lattice engineering regulation and control, a manganese element is introduced into a Prussian blue frame structure, and controllable regulation of the doping amount and optimization of a crystal structure are realized. The prepared material has excellent photothermal conversion capability and multienzyme simulation activity, and shows a photothermal-enzyme synergistic enhancement effect under the irradiation of near-infrared light. In-vitro studies show that the material can efficiently inhibit the growth of gram-negative bacteria; animal experiments further verify that the composition has a remarkable curative effect in infected wound repair. The invention not only provides a preparation method of a nano material with controllable metal doping, but also provides a novel photo-enzyme synergistic treatment method for drug-resistant bacterium infection treatment.

This invention provides a Prussian blue-based sodium-ion battery cathode material, its preparation method, and its application. The preparation method includes: subjecting a first mixture containing activated S-doped g-C3N4 and a Prussian blue precursor to a first ball milling process to obtain the Prussian blue-based sodium-ion battery cathode material. The Prussian blue-based material prepared by the above method exhibits good conductivity and structural stability, and its use as a cathode material in sodium-ion batteries enables sodium-ion batteries to possess excellent rate performance and cycle performance.

The application discloses a novel Na2MnFe(CN)6 material and application thereof as a lithium ion battery, a sodium ion battery, a potassium ion battery, a magnesium ion battery, a zinc ion battery and a zinc-sodium dual-ion battery positive electrode material, wherein the Na2MnFe(CN)6 material is an inorganic material. The excellent electrochemical performance of the novel Na2MnFe(CN)6 material in the application indicates that the novel Na2MnFe(CN)6 material has a very large application prospect as the lithium ion battery, the sodium ion battery, the magnesium ion battery, the zinc ion battery and the zinc-sodium dual-ion battery positive electrode material. Meanwhile, the novel Na2MnFe(CN)6 material has a simple and controllable preparation process, and a simple device, and is a method easy to mass produce.

Provided is a porous metal cyanide-based framework material (MCFs) with cation gating effect, along with its preparation method and application in carbon dioxide capture. The general structural formula of the framework material is Mx[M′(CN)6]y·Az·nH2O, where 0≤n≤10. When n≥1, the crystal structure belongs to the R3c space group. When 0≤n<1, the structure transforms to the P2 / c space group. The framework material has a cage structure, and each cage has six hexagonal windows and six quadrilateral windows. The monovalent cations at the hexagonal windows exhibit a gating effect, which can selectively allow carbon dioxide molecules to pass through. The framework material has the highest CO2 adsorption capacity and selectivity in carbon dioxide capture, especially in the application of carbon dioxide adsorption under low pressure (≤0.15 bar) and high humidity environment (≥40% RH)

This invention provides a Prussian white material, its preparation method, a positive electrode, a battery, and an electrical device. The Prussian white material of this invention comprises a core and a first outer shell covering the surface of the core; the core is composed of Na. x Mn[Fe(CN)6] y •αH₂O, where 1≤x≤1.8, 0.9≤y≤0.99, 1≤α≤3; the first outer shell is composed of Na. a Mn b Ni 1‑b [Fe(CN)6] c ·βH₂O, where 1.2≤a≤1.8, 0.8≤b≤0.995, 0.8≤c≤0.99, 0.5≤β≤3. This invention stabilizes the crystal structure of a pure manganese-based Prussian white material by coating it with a nickel-doped manganese-based Prussian white material shell, thereby suppressing the Jameer-Taylor phenomenon, enhancing the overall stability of the material, and enabling the material to possess both high capacity and excellent cycling stability.

The invention relates to a substance with a Prussian blue structure, which can generate hydroxyl radicals, superoxide anions and singlet oxygen in parallel under ultrasonic irradiation, and in the presence of ultrasonic irradiation and H2O2, the substance with the Prussian blue is used as a sonodynamic therapy (SDT) means to kill focus cells by generating sonotoxic and cytotoxic free radicals, so as to achieve the purpose of improving the therapeutic effect of the substance with the Prussian blue structure. Therefore, diseases are effectively treated.

The application discloses a nickel-based Prussian blue battery positive electrode material and a preparation method and battery thereof, and belongs to the technical field of batteries, wherein the preparation method of the nickel-based Prussian blue battery positive electrode material comprises the following steps: dissolving sodium citrate into a nickel chloride solution to obtain reagent A; dissolving sodium ferrocyanide in water to prepare a solution to obtain reagent B; dissolving polyvinylpyrrolidone in a sodium chloride solution to obtain reagent C; simultaneously and slowly adding the reagent A and the reagent B into the reagent C to obtain a suspension liquid and aging the suspension liquid; centrifugally separating the suspension liquid after aging, washing, drying and grinding to obtain the nickel-based Prussian blue battery positive electrode material; and the nickel-based Prussian blue battery positive electrode material prepared by the application has the characteristics of high capacity, low alternating current impedance and high long cycle stability, and has excellent electrochemical performance.