187 results about "Ionic solution" patented technology

The invention relates to the field of water quality detection, in particular to a method, system and equipment for detecting solution impurities through a water quality detector and a medium. The method comprises the following steps: acquiring spectral data of a to-be-detected ion solution; a correction observation window is constructed on the spectral data according to the local concentration gradient and used for extracting local nonlinear features, and the local nonlinear features comprise absorbance gradient change features and fitting residual error anomaly features; establishing a mapping relation between the spectral data and a water quality detection result according to the local nonlinear characteristics in the correction observation window, and generating a correction coefficient through a scatter correction algorithm; correcting the spectral data according to the mapping relation and the correction coefficient; and identifying impurity components in the ion solution based on the corrected spectral data. The stable mapping relation between the absorbance and the impurity concentration can still be maintained in a strong ion interference environment, so that the measurement result can keep reliable precision even in a high-concentration ion intensity environment.

The invention provides a preparation method of n-p type ionic thermoelectric hydrogel based on a bi-crosslinked network structure. The preparation method comprises the following steps: (1) dissolving a binary hydrogel substrate in water according to a certain proportion; (2) adding a cross-linking agent; (3) dropwise adding the stirred solution into a mold, and carrying out curing molding and drying at a certain temperature; and (4) soaking the cured hydrogel in an n-type ion solution and a p-type ion solution with a certain concentration respectively, and after a period of time, assembling the hydrogel to obtain the n-p type ion thermoelectric hydrogel based on the double-crosslinked network structure. Different from thermoelectric hydrogel which only has a network structure and only uses one thermoelectric type, the technical scheme designs the thermoelectric hydrogel initiated by n-p type ions based on a double-crosslinking network structure, so that more efficient and more stable energy conversion and utilization can be realized; and a new solution is provided for the fields of flexible electronic equipment, low-grade heat energy recovery and the like.

The invention discloses a preparation method of a biodegradable material based on gamma-polyglutamic acid, which comprises the following steps: (1) preparing a low-molecular-weight polyglutamic acid aqueous solution, adjusting the pH value to be acidic to obtain a carboxylic acid group protonated polyglutamic acid solution, then adding a metal ion solution into the polyglutamic acid solution, and uniformly stirring and mixing to obtain a mixed solution; and (2) adjusting the pH value of the mixed solution obtained in the step (1) to be alkaline while stirring, then adding a cross-linking agent into the mixed solution, and carrying out cross-linking curing to obtain the biodegradable material. The material disclosed by the invention has mechanical properties, tensile strength, toughness and the like can be improved, so that the material can better meet the requirements of different application scenes, the application range of the material is widened, and meanwhile, the material has relatively good degradation performance, adsorption performance, antibacterial performance and moisture retention performance, can be produced by utilizing renewable resources, is wide in raw material source and sustainable, and is suitable for industrial production. The dependence on non-renewable resources such as petroleum is reduced.

The invention relates to the technical field of porcelain glaze, and discloses a preparation method for combining porcelain glaze of a carbon nano tube enhanced glass-lined reaction kettle, which comprises the following steps: firstly, preparing a carbon nano tube aqueous dispersion, slowly dropwise adding the carbon nano tube aqueous dispersion into a surfactant solution to obtain a positively charged carbon nano tube aqueous dispersion, adding glaze powder into a negative ion solution, and uniformly stirring to obtain the carbon nano tube enhanced glass-lined reaction kettle porcelain glaze. And fully mixing the glaze particles with negative charges to obtain glaze slip, carrying out centrifugal filtration to obtain preliminarily modified glaze particles, carrying out gradient pre-heating in an aerobic environment to obtain pre-calcined glaze particles, placing the pre-calcined glaze particles in calcination equipment, carrying out oxygen-isolated calcination, and in order to discharge pores in the sintered glaze particles, raising the temperature in the furnace again to enhance the fluidity of the glaze particles. The preparation method comprises the following steps: preparing a glaze block, preparing a vacuum environment by using a vacuum pump, recovering to a normal-pressure environment, stopping heating to obtain the glaze block with tightly combined inside, and finally grinding and crushing the glaze block in grinding equipment with the particle size capable of being adjusted according to downstream application requirements.

The invention discloses a silver particle modified and carbon coated lithium manganese iron phosphate positive electrode material and a preparation method thereof, and relates to the technical field of materials.The preparation method comprises the steps that a lithium source, an iron source, a manganese source and a phosphorus source are mixed and dissolved, and a mixed solution is obtained; adding a silver ion solution into the mixed solution, and carrying out a first hydrothermal reaction to obtain a reaction solution; mixing the reaction liquid with a carbon source and a reducing agent, carrying out a second hydrothermal reaction, and separating a solid phase to obtain a precursor; and sintering the precursor to obtain the lithium iron manganese phosphate positive electrode material. In the hydrothermal reaction stage, silver ions can inhibit rapid growth of high-energy crystal faces, and finally more high-energy crystal faces are exposed. And in the sintering stage, silver ions are reduced into simple substances to modify the carbon layer, a carbon-metal composite conductive network is formed, and the conductivity of the carbon layer is improved. The preparation method is simple and convenient to operate, can quickly and efficiently form the nanoscale lithium manganese iron phosphate positive electrode material with relatively good electrical properties and [001] crystal face orientation, and has a relatively good application prospect.

The invention relates to a preparation method of an oxygen vacancy-rich bismuth molybdate / bismuth vanadate composite photo-anode and a product and application thereof, and belongs to the technical field of photoelectrocatalysis. The invention discloses a preparation method of an oxygen vacancy-rich bismuth molybdate / bismuth vanadate (Bi2Mo2O9 / BiVO4) composite photo-anode, which mainly comprises the following steps: immersing a fluorine ion-doped tin dioxide (FTO) conductive glass substrate into a Bi < 3 + > ion solution and an I <-> ion solution to form a bismuth oxyiodide (BiOI) film, dropwise adding a dimethyl sulfoxide solution of vanadyl acetylacetonate (VO (acac) 2), and putting into a muffle furnace to prepare the BiVO4 photo-anode. And then vertically immersing into a Bi < 3 + > ion solution and a Mo < 6 + > ion solution, and carrying out annealing treatment in an argon atmosphere to prepare the Bi2Mo2O9 / BiVO4 composite photoanode rich in oxygen vacancies. The Bi2Mo2O9 / BiVO4 material rich in oxygen vacancies is a metal oxide composite photo-anode, the photoelectrocatalysis efficiency can be improved, and hydrogen peroxide (H2O2) can be continuously generated in natural seawater through photoelectrocatalytic oxidation of water for a long time.

The invention provides a preparation method of an air cathode material of a mesoporous Cu-N-C zinc-air battery. The preparation method comprises the following steps: 1, uniformly spreading a zinc-based imidazole framework precursor embedded with SiO2 nanoparticles in a corundum boat, placing the corundum boat in the center of a tubular furnace, and carrying out pre-pyrolysis in an Ar atmosphere to obtain nitrogen-doped carbon NC powder containing SiO2 nanoparticles; and 2, removing the SiO2 nanoparticles by using a 40% hydrofluoric acid solution to obtain the mesoporous NC powder. And 3, preparing a copper ammonia ion [Cu (NH3) 4] < 2 + > solution with a certain concentration, adding the mesoporous NC powder, carrying out ultrasonic treatment at room temperature, stirring, and carrying out high-temperature pyrolysis to obtain the mesoporous Cu-N-C material. The material has rich mesoporous structures and excellent oxygen reduction activity, and realizes high power density and excellent charge-discharge cycle stability when being used as an air cathode of a zinc-air battery.

The invention provides a vanadium electrolyte and a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing a compound containing pentavalent vanadium and a sulfuric acid solution to obtain a pentavalent vanadium solution; (2) the pentavalent vanadium solution obtained in the step (1) is subjected to electrolytic reduction, and a first vanadium ion solution is obtained; during the electrolytic reduction, carrying out first ultraviolet irradiation on the pentavalent vanadium solution in the electrolytic reduction process; or, after the electrolytic reduction is completed, the first vanadium ion solution is subjected to second ultraviolet irradiation, and a second vanadium ion solution is obtained; and (3) carrying out extraction and back extraction on the first vanadium ion solution or the second vanadium ion solution in the step (2) to obtain the vanadium electrolyte. By adopting the preparation method, the purity of the vanadium electrolyte and the recovery rate of vanadium are effectively improved, the content of vanadium ions with different valence states in the product can be flexibly regulated and controlled, and the preparation method can be widely applied to all-vanadium redox flow batteries and other industrial fields needing trivalent and tetravalent vanadium solutions.

The invention relates to the technical field of battery disassembling, and particularly discloses a new energy automobile battery disassembling, classifying and recycling device. According to the new energy automobile battery disassembling, classifying and recycling device, the purpose of separating battery fragments from an ionic solution is achieved, equipment is supported by a bottom plate support, the smashed battery fragments are stirred, mixed and heated through a stirring device, and therefore the reaction of ions and a medicament for reduction is accelerated; a stirred solution passes through the interior of the stirring device to be filtered, fragments are pushed out under the action of the stirring device, a medicament passes through the inner wall of the stirring device to reach the interior of the classification device to be concentrated and heated so as to solidify ions, and the ions are gathered and pushed out so as to be conveniently collected; and the evaporated water vapor is cooled by the material guiding device and is used for carrying out auxiliary heating on the new medicament again, so that the medicament reaction speed is increased.

The invention discloses a double-layer ion enhanced high-range high-linearity fabric-based flexible pressure sensor and a preparation method thereof, and belongs to the technical field of underwater flexible pressure sensors. The flexible pressure sensor comprises a first composite layer and a second composite layer, and a porous material is arranged between the first composite layer and the second composite layer. The first composite layer and the second composite layer are symmetrically arranged on the two sides of the porous material; the first composite layer sequentially comprises a flexible substrate, a nickel cloth electrode and an ionic membrane layer from outside to inside, the flexible substrate is formed by thermal bonding of a fabric and a TPU film, and the fabric is located on the outer side; the ionic membrane layer is formed by coating a nickel cloth electrode with a first ionic solution in a silk-screen printing manner; and thermally bonding the first composite layer, the porous material and the second composite layer, and wrapping the outer sides of the first composite layer and the second composite layer with PDMS to obtain the flexible pressure sensor. The flexible pressure sensor has the advantages of ultrahigh measuring range, high linearity, high sensitivity and the like.

The invention discloses a method for regenerating a nitrogen-doped carbon coating lithium iron phosphate positive electrode material, a regenerated positive electrode material and application of the regenerated positive electrode material, and belongs to the technical field of battery materials. The method for regenerating the N / C-coated LiFePO4 positive electrode material comprises the following steps: recycling a waste lithium iron phosphate material from a waste lithium battery by using a roasting and ultrasonic treatment method; uniformly mixing the waste lithium iron phosphate material with a reducing agent and a nitrogen source, and adding the mixture into a lithium ion solution for hydrothermal reaction; and centrifugally separating black powder from the mixed solution after the hydrothermal reaction, and freeze-drying to obtain the nitrogen-doped carbon coating lithium iron phosphate positive electrode material. According to the regenerated N / C-coated LiFePO4 positive electrode material obtained by the method, lithium loss, particle breakage and disordered carbon layer repairing are effectively repaired, and a new way is provided for recycling of the LiFePO4 positive electrode of the waste lithium ion battery.

The invention relates to the technical field of environmental protection and water treatment, in particular to a preparation method and application of a one-step aluminum modified fish scale calcium defluorination material. The defluorination material with economical efficiency and high efficiency is successfully prepared through combination of hydrochloric acid demineralization pretreatment and a sodium metaaluminate one-step modification process; the removal rate of the prepared composite material to a 10mg / L fluorine ion solution can reach 94.76%, the theoretical maximum adsorption capacity reaches 118.53 mg / g, the actual test adsorption capacity reaches 9.56 mg / g, and stable and efficient adsorption performance is kept within the pH range of 3-6; the method is simple in technological process and mild in reaction condition, the material preparation cost is remarkably reduced, and an innovative solution with practicability and economical efficiency is provided for fluorine-containing wastewater treatment.

A silver particle-modified carbon-coated lithium manganese iron phosphate cathode material and a preparation method thereof relate to the field of material technology. The preparation method comprises the following steps: mixing and dissolving a lithium source, an iron source, a manganese source, and a phosphorus source to obtain a mixed solution; adding a silver ion solution to the mixed solution, performing a first hydrothermal reaction, and obtaining a reaction solution; mixing the reaction solution with a carbon source and a reducing agent, performing a second hydrothermal reaction, separating the solid phase, and obtaining a precursor; and sintering the precursor to obtain the lithium manganese iron phosphate cathode material. During the hydrothermal reaction stage, silver ions can inhibit the rapid growth of high-energy crystal faces, ultimately exposing more high-energy crystal faces. During the sintering stage, the silver ions are reduced to a single substance to modify the carbon layer, forming a "carbon-metal" composite conductive network and improving the conductivity of the carbon layer. The preparation method is simple and convenient to operate, and can quickly and efficiently form a nanoscale lithium manganese iron phosphate cathode material with better electrical properties and a [001] crystal plane orientation, thus having good application prospects.

The invention discloses an ionic conductive hydrogel material as well as a preparation method and application thereof in an electrochemical electrode. The ionic conductive hydrogel material is prepared from the following raw materials in parts by weight: a nonionic water-soluble polymer, a water-soluble ionic polymer, a cross-linking agent, an initiator and a water-retaining agent. After the ionic conductive hydrogel is processed into a certain shape and soaked in a conductive ionic solution, the ionic conductive hydrogel can be used as a solid electrolyte to construct an electrochemical electrode suitable for on-site coating detection. The ionic conductive hydrogel disclosed by the invention has the advantages of optimal ionic conductivity, necessary mechanical property and mechanical stability, controllable swelling ratio and excellent chemical and electrochemical stability. The ionic conductive hydrogel is applied to an electrochemical electrode as a solid electrolyte, and high-concentration electrolytic active substances, namely conductive ions, are allowed to freely move in the hydrogel, so that the ionic conductivity of the hydrogel electrolyte is improved, and the reliability of the electrochemical electrode is ensured.

Systems and methods for generating hydrogen. The method includes activating an aluminum composition via alloying with at least one metal, reacting the activated aluminum composition in an aqueous ionic solution to produce hydrogen, and adding imidazole to the aqueous ionic solution and the activated aluminum composition to increase the reaction rate between the activated aluminum composition and the aqueous ionic solution.

The application discloses a preparation method of a cement-based material surface calcium carbonate crystalline layer, and comprises the following steps: step one, mixing cement and water, pouring into a mold for curing, demolding and curing to obtain a cement test block which is not completely hydrated; step two, adding sodium chloride, sodium sulfate, potassium chloride and sodium bicarbonate into deionized water to prepare an inorganic ion solution, and the concentration of sodium bicarbonate is greater than or equal to 0.20 g / kg; step three, soaking the cement test block which is not completely hydrated obtained in step one into the inorganic ion solution prepared in step two, rinsing the surface after taking out, terminating hydration, vacuum drying, and obtaining a cement test block surface calcium carbonate crystalline layer. The prepared crystalline layer is uniform and dense, the operation is simple, the surface mineralization can be carried out by using bicarbonate ions in the inorganic ion solution, the penetration of chloride ions and the potential negative effects accompanied by the penetration of chloride ions are avoided, and the cement test block can be further modified by silane to obtain high hydrophobicity and resist moisture infiltration.

Proposed is a self-current-generating skin-applicable patch with a first area in contact with the skin and a second area adjacent to and spaced apart from it, where either area contains a biodegradable metal, decomposable and absorbable through skin contact or reaction with tissue moisture. The patch includes a first electrode layer directly contacts the skin as a thin sheet integrated with the first area and has at least one fluid-transferable penetration part, a second electrode layer of a material with a different standard reduction potential is positioned opposite a skin-contacting side, partially extending to connect electrically to the second area, and a support layer, a hydrophilic sheet of predetermined thickness, is positioned opposite the skin-contacting side, having an ionic solution supported. Thus, sufficient iontophoresis and other micro-current effects with active ingredients are achieved through self-generated micro-current, even without a battery-like external power source.

The invention belongs to the technical field of new materials, and provides a preparation method of high-yield nickel disulfide (NiS2) or a nickel disulfide / sulfur compound (NiS2 / (x-2) S, 3 < = x < = 8) and an application of NiS2 or NiS2 / S in an electrode material. The preparation method comprises the following steps: mixing a nickel ion (Ni < 2 + >) solution with a sodium disulfide (Na2S2) solution or a sodium polysulfide (Na2Sx, x is greater than or equal to 3 and less than or equal to 8) solution, stirring and reacting for 0.5-12 hours, collecting precipitates obtained by reaction, washing and drying to obtain a NiS2 or NiS2 / (x-2) S (x is greater than or equal to 3 and less than or equal to 8) product. The preparation method is simple and easy to operate, low in cost, high in atom utilization rate, green and environment-friendly, high in safety and capable of realizing large-scale industrial production. And when used as an electrode material for a sodium ion battery, the composite material shows good electrochemical performance.

The invention provides a method for extracting rubidium and cesium from mixed salt or solution containing rubidium and cesium, which comprises the following steps: S1, providing a raw material, and purifying an ionic solution containing rubidium and cesium to obtain a solution containing rubidium and cesium; s2, aluminum sulfate and sulfuric acid are added into the solution containing rubidium and cesium for preferential crystallization of cesium, and a first batch of aluminum alum crystals and a first mother solution are obtained; s3, dissolving and purifying the first batch of alumen crystals to obtain high-purity cesium salt; s4, sequentially carrying out evaporation concentration and crystallization separation on the first mother liquor to obtain a second batch of alumen crystals and a second mother liquor; and S5, fusing and purifying the second batch of alumen crystals to obtain high-purity rubidium salt, and returning the second mother liquor to the step S1 for recycling, and the method has the effects of high extraction recovery rate and low cost.

The invention belongs to the technical field of electroplating, and particularly relates to a row hanging tool with auxiliary anodes. The main body part is arranged in the middle of the anode part and is used for supporting the device; the connecting supporting rods are symmetrically arranged on the left side and the right side of the main body component, and modified hooks are evenly arranged on the outer surfaces of the connecting supporting rods. After a metal piece needing to be electroplated is hung on the refitted hook of the device, the metal piece is immersed in an ion solution for electroplating work, and the rotary hook can realize a self-locking state in a manner that the inner rotary hook rod is inserted into the adaptive slot, so that the metal piece hung on the refitted hook cannot be separated from the device; when the metal part enters an ion solution for electroplating, the independent motor can drive the rotary hook and the metal part to rotate at the axis, so that the outer surface of the metal part is in full contact with the ion solution, and the problem that the contact part of the metal part and the modified hook cannot be effectively electroplated to cause electroplating flaws is solved.

The application discloses a preparation method of zero-valent iron with a high Fe(II) content magnetite interface by regulating the redox intensity, and belongs to the field of water treatment. The method comprises the following steps: uniformly mixing zero-valent iron particles and ferrous ion solution at 20 DEG C-30 DEG C, regulating the initial pH value to 1-4 by using a sulfuric acid solution, adding a sulfur ion solution after 20 min of reaction and reacting for another 5 min, wherein the mass ratio of the added sulfur ion to the initial ferrous ion is 0.2-0.4:1; after the reaction is completed, the zero-valent iron particles are separated by magnetism, and are dried in a vacuum oven at 40 DEG C-60 DEG C for 4-12 h to obtain Fe3O4@mZVI materials. The zero-valent iron composite material with a high Fe(II) content magnetite interface prepared by the method can be prepared in an open system without controlling the anaerobic reaction atmosphere environment. Meanwhile, the ferrous ion is oxidized by using air, and no external oxidizing agent is needed, so that the method has the advantages of simple and rapid preparation and low cost. In the preparation process, the sulfur ion is added to regulate the redox reaction degree, the proportion of Fe(II) on the material surface is significantly improved, and the zero-valent iron composite material has better reaction activity and durability for pollutant removal.

A process for producing technetium-99m from a molybdenum-100 metal powder, comprising the steps of:(i) irradiating in a substantially oxygen-free environment, a hardened sintered target plate coated with a Mo-100 metal, with protons produced by a cyclotron;(ii) dissolving molybdenum ions and technetium ions from the irradiated target plate with an H2O2 solution to form an oxide solution;(iv) raising the pH of the oxide solution to about 14;(v) flowing the pH-adjusted oxide solution through a resin column to immobilize K[TcO4] ions thereon and to elute K2[MoO4] ions therefrom;(vi) eluting the bound K[TcO4] ions from the resin column;(vii) flowing the eluted K[TcO4] ions through an alumina column to immobilize K[TcO4] ions thereon;(viii) washing the immobilized K[TcO4] ions with water;(ix) eluting the immobilized K[TcO4] ions with a saline solution; and(x) recovering the eluted Na[TcO4] ions.

The invention discloses an iron-silicon magnetic powder core and a preparation method thereof, and belongs to the technical field of soft magnetic materials and powder metallurgy. The preparation method comprises the following steps: fully mixing a phosphoric acid metal ion solution containing phosphoric acid and metal acid phosphate with iron-silicon alloy powder; the mass ratio of the phosphoric acid solution to the metal acid phosphate to the iron-silicon alloy powder is (0.25-1.5): (0.5-3): 100, and the mass ratio of the phosphoric acid solution to the metal acid phosphate to the iron-silicon alloy powder is (0.25-1.5): (0.5-3): 100; and the coated iron-silicon alloy powder is pressed, and the iron-silicon magnetic powder core is prepared. According to the scheme, the iron-silicon alloy powder is added into the weak acid mixed solution of the phosphoric acid and the metal acid phosphate, so that the dosage of the phosphoric acid in the passivation process is reduced, the passivation speed of the iron-silicon alloy powder is slowed down, and a more uniform insulating coating layer can be formed; meanwhile, by adding metal acid phosphate, acid radical ions are provided in the passivation process, and corresponding orthophosphoric acid metal is generated on the outer surface of the iron-silicon alloy powder.

The application relates to the technical field of electrolytic water oxygen production, in particular to a composite electrode material and a preparation method and application thereof. The preparation method of the composite electrode material comprises the following steps: roughening the surface of a stainless steel mesh by performing first CV activation on the stainless steel mesh in a KOH solution, releasing Cr 3+ ions in the stainless steel mesh 3+ ions, and obtaining the stainless steel mesh after CV activation; performing second CV activation on the stainless steel mesh after CV activation in a Ni 2+ ion solution, forming Cr-doped nickel-iron hydroxide covering the surface of the stainless steel mesh, and obtaining the composite electrode material. The Cr-doped nickel-iron hydroxide loaded on the surface of the stainless steel mesh obtained by the preparation method can solve the technical problems of iron element dissolution, deactivation and active stability decline of the existing nickel-iron hydroxide in a long-period oxygen evolution process.

This invention discloses a vanadium-doped modified sodium iron pyrophosphate material based on spray drying, its preparation method, and its applications. The material exhibits a spherical porous morphology with a particle size between 1 and 10 micrometers; its chemical formula is: Na. 4‑x Fe 3‑x V x (PO4)2P2O7, where 0 < x ≤ 0.1. It is prepared by spray drying, ensuring atomic-level mixing of vanadium and iron through a uniform and stable complexed ion solution; and promoting the formation of a porous spherical morphology through the volatilization of the acidic substrate during rapid drying. The combination of spray drying and trace vanadium doping technology is beneficial for activating more active sodium sites in the sodium iron pyrophosphate cathode material, improving the reversible sodium insertion / extraction capacity, while promoting sodium ion diffusion, reducing polarization voltage, and improving the cycle stability of the material.

The invention relates to a preparation method of a monatomic catalyst with an adjustable coordination environment. The method comprises the following steps: adding precursor salt of reducible metal oxide into an obtained transition metal salt ion solution to obtain a mixed salt solution; pouring the mixed salt solution into the sodium hydroxide solution; turbid liquid is obtained; crystallizing at the temperature of between 150 and 200 DEG C for 24 to 48 hours; and washing, drying and roasting at 500-900 DEG C to obtain the monatomic catalyst with the transition metal loaded on the reducible metal oxide. The transition metal monatomic catalyst with the adjustable coordination environment is doped in reducible metal oxide, and transition metal monatomic in different coordination environments has obvious influence on adsorption and activation of low-carbon alkane and CO2.

The invention discloses a method for activating a copper-indium-sulfur thin film through selenium ions at a low temperature and a solar cell based on the thin film. According to the method, the CuInS2 thin film prepared by spin coating is treated by adopting the selenium ion solution, so that diffusion and distribution of selenium ions in the CuInS2 thin film prepared by spin coating are accurately regulated and controlled, carrier recombination is inhibited, and the CuInS2 thin film which is better in energy band structure, lower in defect state density and better in crystallinity and morphology is obtained; and the solar cell with high efficiency (more than 10.0%) is prepared on the basis. The method disclosed by the invention has the advantages of simplicity in operation, low equipment requirement, low cost, low toxicity of used drugs and small damage of a treatment technology to a thin film structure, overcomes the defects of complicated operation, high equipment requirement, damage to a thin film crystal structure by treatment in a high-temperature environment and the like in the prior art, and opens up a new way for high-performance and low-cost inorganic thin film photovoltaics.

The invention discloses a preparation method of a modified lithium-rich manganese-based positive electrode material and the positive electrode material. The preparation method comprises the following steps: (1) respectively preparing aqueous solutions of nickel-cobalt-manganese metal ions, a precipitator and a complexing agent; (2) adding the nickel-cobalt-manganese metal ion solution, the precipitant solution and the complexing agent solution into a reaction kettle for reaction to obtain a suspension; (3) washing, filtering and drying the suspension to obtain a nickel-cobalt-manganese composite material precursor; the chemical formula of the nickel-cobalt-manganese composite material precursor is Mn < x > Ni < y > Co < z > (OH) < 2 > or Mn < x > Ni < y > Co < z > CO < 3 >, 1, 0.1 lt; yt; Yt; 0, 0.5, 0 lt; zlt, zlt; 0.3 part; (4) adding the nickel-cobalt-manganese composite material precursor Mn < x > Ni < y > Co < z > (OH) < 2 > or Mn < x > Ni < y > Co < z > CO < 3 >, a titanium source, an aluminum source and a phosphate radical source into an organic solvent for mixing, heating, stirring and mixing at 40-80 DEG C, and drying at 80-120 DEG C to obtain an aluminum-titanium phosphate coated precursor; and (5) grinding the aluminum titanium phosphate coated precursor, mixing with a lithium source, and sintering at 400-950 DEG C to obtain the positive electrode material. The scheme of the invention has the advantages of being higher in capacity, better in cycle performance, simple and easy to implement, and capable of realizing industrialization.

The objective of the present invention is to provide a high-efficiency denitrification catalyst in which denitrification performance does not deteriorate even if at least two types of reducing agents are individually or simultaneously used to mix and use various reducing agents. The catalyst includes Cu and Ag ion-exchanged and impregnated in zeolite, and may comprise the steps of: preparing a metal ion solution; mixing the metal ion solution with zeolite; reacting the metal ion solution with the zeolite; drying the reacted zeolite; firing the dried zeolite; and coating a monolith carrier with the prepared catalyst.

The application discloses a kind of high stability two-dimensional nanometer material aerogel and preparation method thereof, it is related to material science and nanotechnology field.The water solution of two-dimensional nanometer material is frozen and handled to obtain frozen tissue, then foam structure is obtained by freeze drying, after which foam structure is soaked in ionic solution, freeze-dried, to obtain two-dimensional nanometer material aerogel.The application constructs two-dimensional nanometer material foam structure and introduces ionic bond crosslinking mechanism, so that two-dimensional nanometer material is combined by ionic bond to form high stability aerogel, so that aerogel has excellent performance.The application breaks through the selection limit of traditional aerogel material, and is suitable for ceramic two-dimensional material and MXenes with insufficient surface functional groups, lays a foundation for two-dimensional material aerogel large-scale production and application in the field of energy, aerospace and the like.