22 results about "Manganese ferrite" patented technology

The application discloses a MnFe2O4 / GO wave-absorbing aerogel with a directional aperture structure and a preparation method thereof, belongs to the technical field of wave-absorbing material preparation, and is characterized in that manganese ferrite (MnFe2O4) magnetic particles are uniformly loaded on the surface of graphene to obtain a graphene aerogel with a three-dimensional loose porous structure and magnetic particle assembly; the MnFe2O4 is prepared by using a low-temperature co-precipitation method, and the MnFe2O4 / GO wave-absorbing aerogel is prepared by combining directional freezing and heat treatment, and the method is mild and simple. The application improves the impedance mismatch problem of the graphene material, enhances the magnetic loss of the material, and obtains a novel porous aerogel wave-absorbing material which has both dielectric loss and magnetic loss by introducing the manganese ferrite.

The invention relates to the technical field of resource recycling and high-value utilization of lithium ion batteries, in particular to a technology for generating, recycling or refining metal through an electrolytic method. The invention discloses a method for synthesizing a manganese ferrite magnetic material from a waste lithium manganese iron phosphate positive electrode material. The method comprises the following steps: preparing waste lithium manganese iron phosphate positive electrode powder, an organic binder and a solvent into slurry, and coating the surface of a titanium mesh with the slurry to obtain a positive plate; constructing an electrolytic tank by taking a blank titanium mesh as a negative electrode and a NaOH aqueous solution as an electrolyte, carrying out electrolytic leaching to obtain Li and P elements, concentrating the electrolyte, supplementing a phosphorus source, and adjusting the pH value to recover lithium phosphate; the method comprises the following steps: ultrasonically separating ferromanganese / graphite remained on a titanium mesh, acidizing and dissolving, filtering to remove graphite, adding citric acid into filtrate for gelation, and subsequently calcining to obtain the manganese ferrite magnetic material. According to the method, efficient leaching of Li and P is achieved through electrochemical treatment, Mn and Fe are synchronously converted into high-crystallinity manganese ferrite in a high-valued mode, and the method has the advantages of being environmentally friendly, low in consumption and capable of achieving all-element closed-loop recovery.

The invention discloses a glucose derived carbon modified magnetic metal oxide catalyst as well as a preparation method and application thereof. According to the catalyst, glucose is taken as a carbon source, spinel manganese ferrite MnFe2O4 nanoparticles are uniformly anchored on the surface of a porous carbon skeleton through a hydrothermal-calcination process, the saturation magnetization reaches 21.21 emu / g, and rapid separation can be realized in an external magnetic field within 5 seconds. The catalyst is applied to activation of peracetic acid PAA for oxidative degradation of tetracycline TC. The degradation reaction conditions are as follows: the TC initial concentration is 10 mg / L, the PAA concentration is 200 mu M, the catalyst addition amount is 0.1 g / L, the initial pH is 3.0-9.0, the reaction time is 30 minutes, and the TC removal rate is greater than or equal to 97%. The catalyst is cheap in raw materials, simple and convenient to prepare, magnetically recoverable, wide in pH adaptation and free of secondary pollution, and has large-scale preparation and engineering application potential.

The invention belongs to the technical field of photocatalytic materials, and particularly relates to a manganese ferrite / zinc gallate heterojunction photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: 1) dissolving zinc acetate and gallium nitrate hydrate in deionized water, then adding citric acid monohydrate, and obtaining zinc gallate by using a sol-gel method; 2) dissolving ferric chloride hexahydrate and manganese chloride tetrahydrate in deionized water, then adding a sodium hydroxide solution, and obtaining manganese ferrite by using a hydrothermal method; 3, zinc gallate and manganese ferrite are dissolved in a methanol solution, and the manganese ferrite / zinc gallate heterojunction photocatalyst is obtained through a mechanical stirring method.By means of heterojunction formation, the activity of the manganese ferrite / zinc gallate for photocatalytic reduction of carbon dioxide can be greatly improved.

The present application relates to the technical field of lithium ion battery resource recycling and high value utilization, specifically relates to the process of generating, recycling or refining metal by electrolysis method, and discloses a method for synthesizing manganese ferrite magnetic material from waste manganese iron phosphate lithium positive electrode material: first, waste manganese iron phosphate lithium positive electrode powder is mixed with organic binder and solvent to form slurry, and then the slurry is coated on the surface of titanium mesh to obtain a positive electrode sheet; a blank titanium mesh is used as a negative electrode, and NaOH aqueous solution is used as an electrolyte to construct an electrolytic cell, and Li and P elements are leached by electrolysis; the electrolyte is concentrated, supplemented with phosphorus source, and adjusted in pH to recover lithium phosphate; the manganese iron / graphite remaining on the titanium mesh is separated by ultrasonic, and then acidized and dissolved; the graphite is removed by filtration; the filtrate is gelled with citric acid; and the manganese ferrite magnetic material is obtained by subsequent calcination. The method realizes efficient leaching of Li and P through electrochemical treatment, and simultaneously converts Mn and Fe into high-crystallinity manganese ferrite, which has the advantages of green low consumption and full-element closed-loop recycling.

This invention belongs to the field of microwave catalysis, specifically relating to a method for preparing and applying a copper-manganese composite ferrite microwave catalyst capable of forming oxygen vacancies. The catalyst preparation method includes the following steps: (1) adding ferric chloride, copper chloride, and manganese chloride to deionized water to obtain a precursor aqueous solution, then adding urea and stirring; (2) adding sodium hydroxide aqueous solution dropwise to the precursor aqueous solution obtained in step (1) while stirring, adjusting the pH to 11-12 to obtain a suspension, and continuing stirring; (3) filtering, washing, and drying the suspension obtained in step (2) to obtain a solid substance; (4) grinding and sintering the solid substance obtained in step (3) to obtain the copper-manganese composite ferrite microwave catalyst. The preparation method of this invention has a simple process flow, short processing time, high safety, and better microwave catalytic activity and stability than manganese ferrite and copper ferrite alone.

The invention discloses a method for preparing a wastewater treatment agent by using fish culture solid waste, which comprises the following steps: (1) drying fish manure, carbonizing, washing the obtained solid product with water, drying, and grinding to obtain biomass carbon powder; and (2) adding a Mn < 2 + > source, a Fe < 3 + > source, urea and glucose into water to form a mixed solution, then carrying out hydrothermal reaction under a stirring condition, freeze-drying the obtained reaction solution after the hydrothermal reaction is completed, and then grinding to obtain the modified spinel type manganese ferrite powder. And (3) uniformly mixing the biomass carbon powder, the modified spinel manganese ferrite powder, polyethylene glycol, a Mn < 2 + > source and a Fe < 3 + > source, performing wet granulation, drying and curing, standing in water, and airing to obtain the wastewater treatment agent. According to the invention, the fish culture solid wastes are prepared into the biochar with abundant pore structures, and then the biochar is combined with the catalyst to form the treating agent, so that the effective utilization of the wastes is realized.

The application discloses a preparation method of a manganese ferrite-diatomic sewage treatment catalyst and application thereof, and comprises the following steps: (1) diatomic is immersed in nitric acid for treatment, and then manganese oxide and iron oxide are added; then, lye is added to adjust the system to be alkaline, and modified diatomic mixed solution is obtained; (2) tetraethyl titanate is added to the mixed solution for hydrothermal reaction, and then the solid product is separated, and a precursor is obtained; (3) the precursor, zinc acetate and water are uniformly mixed, dried to remove water, and then calcined in a protective atmosphere; after the completion of the calcination, the calcined product is cooled to room temperature, heated and reduced in a hydrogen atmosphere, and then cooled to room temperature; the product is washed and dried, and the catalyst is obtained. The catalyst has good catalytic activity, can efficiently degrade BPA and other organic pollutants in wastewater, and can be efficiently separated and recovered from the wastewater.

The present invention relates to the technical field of anti-icing materials, and in particular to a manganese ferrite magnetic nanoparticle, preparation method and application thereof. The manganese ferrite magnetic nanoparticle prepared by the present invention is LaxCaySrzMnO3, wherein X=0.1-0.7, Y=0.1-0.35, and Z=0-0.16; and is prepared from the following materials, comprising, in parts by weight: 10-70 parts of lanthanum nitrate, 10-35 parts of calcium nitrate, 2-10 parts of strontium nitrate, and 30-50 parts of manganese nitrate.

A transmission line is disclosed which includes a first conductor, a second conductor, a composite disposed between the first conductor and the second conductor, the composite includes non-linear inclusions comprising one or more of non-linear dielectric and non-linear magnetic inclusions mixed in a matrix material, wherein the non-linear dielectric inclusions are selected from the group consisting of barium strontium titanate (BST), barium titanate, strontium titanate, barium zirconate titanate, lead zirconate titanate, lead titanate, lithium niobate, potassium niobate, lead scandium tantalate, strontium barium niobate, and combinations thereof, and the non-linear magnetic inclusions are selected from the group consisting of nickel zinc ferrite (NZF), manganese zinc ferrite, cobalt ferrite, manganese ferrite, zinc ferrite, nickel ferrite, and combinations thereof, wherein the non-linear inclusions by volume are about 25% NZF, about 10% BST / 15% NZF, and about 15% BST / 10% NZF, and wherein the first conductor, the second conductor, and the composite form a capacitor.

This invention belongs to the field of photocatalytic materials technology, specifically relating to a manganese ferrite / silver hexabromobismuthate dicesium heterojunction photocatalyst, its preparation method, and its application. The mass ratio of manganese ferrite to cesium hexabromobismuthate dicesium heterojunction photocatalyst is 1:3 to 1:7. The preparation method includes: dissolving manganese chloride and ferric chloride hydrate in deionized water, then adding sodium hydroxide, and obtaining manganese ferrite using a hydrothermal method; dissolving silver bromide and bismuth bromide in hydrobromic acid, heating in an oil bath, then adding cesium bromide, and obtaining cesium hexabromobismuthate dicesium using an acid precipitation method; and dissolving manganese ferrite and cesium hexabromobismuthate dicesium in an ethanol solution, and obtaining the manganese ferrite / silver hexabromobismuthate dicesium heterojunction photocatalyst using a mechanical stirring method. The formation of the heterojunction can significantly improve the photocatalytic reduction activity of carbon dioxide by manganese ferrite / silver hexabromobismuthate dicesium.

The invention relates to the technical field of catalyst preparation, in particular to a method for preparing a low-temperature denitration catalyst under the assistance of an active auxiliary agent. The method comprises the following steps: 1) phosphorus-doped modified activated carbon; 2) co-precipitating and loading manganese ferrite; 3) grafting modification of ammonium molybdate; according to the preparation method, activated carbon is doped with phosphorus, coordination sites of metal ions are constructed on the activated carbon, Fe < 2 + > and Mn < 2 + > are adsorbed by the sites to form a precursor of manganese ferrite, and the catalyst P-AC / MnFe2O4 / MoOx is obtained after ammonium molybdate grafting modification and high-temperature calcination. According to the invention, P is doped with a strong acid site, manganese ferrite is co-precipitated, spinel is formed for concerted catalytic denitration, P and MoOx are used as sacrificial agents, SO2 / H2O poisoning is reduced, high efficiency and stability of active components are actively protected, the fundamental industrial problem that low-temperature activity, poisoning resistance and high selectivity are difficult to consider at the same time is successfully solved, and comprehensive and remarkable performance advantages and application potential are shown.

The present application relates to the technical field of water treatment materials, and particularly relates to an organic-inorganic hybrid material for removing heavy metal ions in sewage and a preparation method thereof, the material is composed of the following components in mass percentage: sulfonated polyether sulfone, content is 30-40%; ZIF-8 metal organic framework material, content is 30-45%; cysteine functionalized manganese ferrite nanoparticles, content is 20-30%, the present application adopts a sulfonated polyether sulfone / ZIF-8 / MnFe2O4 ternary composite structure, integrates three mechanisms of electrostatic adsorption, coordination complexation and physical adsorption, and improves the adsorption capacity and selectivity for various heavy metal ions.

The application discloses application of manganese ferrite nanomaterial in enhancing drought resistance of rice, and belongs to the technical field of novel pesticides.The application of the manganese ferrite nanomaterial in enhancing drought resistance of rice is that soil and the manganese ferrite nanomaterial are mixed uniformly to form mixed soil, and then rice seeds are planted for cultivation; the concentration of the manganese ferrite nanomaterial in the soil is 1-50 mg / kg, and is preferably 10 mg / kg; the manganese ferrite nanomaterial is spherical, the particle size is 20-60 nm, the hydrodynamic diameter is 982 nm, and the Zeta potential is-27 mV.The application can effectively promote the growth and drought resistance of rice under drought stress, and significantly improves the yield and quality of rice under drought stress.

The invention relates to the technical field of lithium ion battery negative electrode materials, in particular to an iron-manganese-based double-phase composite nano material and a preparation method and application thereof.The preparation method comprises the steps that FeCl3. 6H2O and MnCl2. 4H2O with a certain molar ratio are dissolved in deionized water, and stirring is conducted at the room temperature till particles are completely dissolved; and adding a certain amount of NaOH serving as a precipitator into the dissolved solution, continuously stirring until the precipitate is completely initiated, and standing overnight to obtain the product. According to the preparation method, a co-precipitation method is adopted to be matched with regulation and control of the calcination temperature of the precursor, so that the double-phase composite nano material composed of hematite and manganese ferrite can be successfully synthesized; therefore, when the double-phase composite nano material is used as a battery negative electrode, the material can inhibit particle aggregation, enhance the structural stability, improve the reaction reversibility and greatly improve the cycling stability, and has important application potential and excellent electrochemical performance in many fields.

The invention provides a manganese ferrite coated ZIF-8-wollastonite composite particle and a preparation method and application thereof, the manganese ferrite coated ZIF-8-wollastonite composite particle comprises a manganese ferrite core, a ZIF-8 shell layer coating the outer surface of the manganese ferrite core and a wollastonite shell layer further coating the outer surface of the ZIF-8 shell layer, and the composite particle is of a core-shell-shell structure. According to the invention, a core-shell-shell composite structure comprising a manganese ferrite core, a ZIF-8 shell layer and a wollastonite shell is sequentially constructed to form functional complementary and stable composite particles, and the manganese ferrite core endows the material with excellent magnetic response characteristics, so that the material can realize rapid and efficient solid-liquid separation through an external magnetic field after adsorption; the ZIF-8 shell layer provides rich pores and active sites and serves as a main adsorption functional carrier, and meanwhile manganese ferrite particles are evenly embedded into a framework of the ZIF-8 shell layer, so that strong magnetic coupling among magnetic particles is effectively reduced, the agglomeration phenomenon is reduced, and the adsorption efficiency is improved.

The invention relates to manganese ferrite ceramic as well as a preparation method and application thereof, and the preparation method comprises the following steps: ball-milling and uniformly mixing a ceramic raw material and a solvent to obtain slurry; curing the slurry in a mold, demolding and drying to obtain a blank plate, or granulating the slurry, pressing in the mold, and demolding to obtain a blank plate; the blank plate is subjected to glue discharging treatment and then subjected to sintering treatment, the sintering temperature ranges from 1100 DEG C to 1300 DEG C, and the manganese ferrite ceramic is obtained; the ceramic raw material comprises the following components in parts by mass: 40-50 parts of manganese dioxide powder; 20 to 25 parts of ferric oxide powder; and 5-10 parts of aluminum oxide powder. According to the manganese ferrite ceramic prepared by the method, the surface resistivity is 106-109 omega / sq, the elastic modulus is greater than or equal to 50 GPa, and the porosity is 35-45%.

The invention discloses a preparation method of biomass fuel oil based on straw, and relates to the technical field of biomass fuel oil. The straw-based biomass fuel oil is prepared from alkali-pretreated straw, aspergillus niger, a manganese ferrite, titanium dioxide and aluminum doped mesoporous silica composite catalyst, molybdenum disulfide and cobalt powder. The method comprises the following steps: performing biological fermentation on alkali-pretreated straws and an aspergillus niger spore suspension, and performing catalytic pyrolysis under the action of a manganese ferrite, titanium dioxide and aluminum doped mesoporous silica composite catalyst, so that a biological and chemical synergistic multi-stage catalytic system not only realizes precise striking and efficient catalysis, but also effectively improves the liquefaction yield, and the process is simple and convenient. The oxygen content and the acid value of the biomass fuel oil are greatly reduced and the quality of the fuel oil is remarkably improved in a manner of deep deoxidation and organic acid degradation.

The invention belongs to the field of new energy materials and electrochemical energy storage, and particularly relates to a zirconium pyrophosphate surface coated and modified O3-phase sodium nickel manganese iron oxide layered composite material, the structural formula of the material is NaNi < 0.25 > Fe < 0.30 > Mn < 0.45 > O < 2 > (at) ZrP2O7, and the material can be used as a long-life and high-energy-density sodium ion battery positive electrode active material. A uniform and conformal zirconium-based-phosphate artificial interface layer with the thickness of 1-2 nm is constructed on the surface of a nickel-iron-manganese hydroxide precursor through an insoluble salt precipitation conversion reaction, subsequent sodium-mixed calcination is performed, the calcination conditions are regulated and controlled, and finally an O3-phase sodium-nickel-iron-manganese oxide NaNi < 0.25 > Fe < 0.30 > Mn < 0.45 > O < 2 > (at) ZrP2O7 layered material coated with zirconium pyrophosphate on the surface is synthesized to serve as the sodium-ion battery positive electrode material. The material shows excellent electrochemical performance in a high-potential interval.

The present invention relates to the technical field of anti-icing materials, and in particular to a manganese ferrite magnetic nanoparticle, preparation method and application thereof. The manganese ferrite magnetic nanoparticle prepared by the present invention is LaxCaySrzMnO3, wherein X=0.1-0.7, Y=0.1-0.35, and Z=0-0.16; and is prepared from the following materials, comprising, in parts by weight: 10-70 parts of lanthanum nitrate, 10-35 parts of calcium nitrate, 2-10 parts of strontium nitrate, and 30-50 parts of manganese nitrate.

The invention discloses a preparation method and application of a manganese ferrite-diatomite sewage treatment catalyst, and the preparation method comprises the following steps: (1) placing diatomite in nitric acid for dipping treatment, and then adding manganese oxide and iron oxide; and then adding alkali liquor to adjust the system to be alkaline to obtain the modified diatomite mixed liquor. (2) adding tetraethyl titanate into the mixed solution for hydrothermal reaction, and separating out a solid product after hydrothermal reaction is completed, so as to obtain a precursor; (3) uniformly mixing the precursor, zinc acetate and water, drying to remove moisture, and calcining in a protective atmosphere; and cooling to room temperature after completion, carrying out heating reduction treatment on the obtained calcined product in a hydrogen atmosphere, cooling to room temperature after completion, washing the product, and drying to obtain the catalyst. The catalyst disclosed by the invention not only has good catalytic activity and can efficiently perform multiple degradation on organic pollutants such as BPA in wastewater, but also can be efficiently separated and recycled from the wastewater.

This invention relates to a sodium manganese ferrite cathode material for sodium-ion batteries and its preparation method, belonging to the field of sodium-ion battery technology. The chemical composition of the sodium manganese ferrite cathode material for sodium-ion batteries is Na. a Mn b Fe c X d O 2‑β Hereinafter referred to as NMFX, where 0.6≤a≤0.9, 0.45≤b≤0.85, 0.25≤c≤0.55, 0≤d≤0.15, and 0≤β≤1. The sodium manganese ferrite cathode material for sodium-ion batteries prepared by this invention has extremely low cost compared to cathode materials containing elements such as Ni, Cu, and Co. Furthermore, the P2 phase sodium manganese ferrite cathode material exhibits good high-voltage performance, and the sodium manganese ferrite cathode material for sodium-ion batteries prepared through lithium-ion doping modification demonstrates excellent cycle stability.