118 results about "Manganese ferrite" patented technology

The present invention discloses a mesoporous manganese ferrite Fenton-like catalyst and preparation method and application thereof and pertains to the field of preparation of Fenton-like catalysts. The present invention uses KIT-6 as a hard template agent to synthesize mesoporous manganese ferrite catalyst. The prepared mesoporous manganese ferrite and hydrogen peroxide constitute a Fenton-like system oxidation wastewater treatment system to carry out efficient removal and mineralization of organic pollutants in wastewater. The preparation method of the present invention is simple and efficient. The prepared Fenton-like catalyst has a mesoporous structure and a relatively large specific surface area. It can provide more adsorption sites and catalytic site and efficiently degrade pollutants in a wide pH range (acidic, neutral and even alkaline) and solves the problem that conventional Fenton reaction occurs only under an acidic condition and a large amount of iron sludge is generated during reaction, causing secondary pollution. Further, the catalyst can be used cyclically and easily separated from the water solution and recovered after use.

The invention provides a preparation method of a manganese ferrite nanoparticle (MnFe2O4)-graphene compound. The preparation method comprises the following steps of: obtaining a mixed solution of manganese ions and oxidized graphene in the process of preparing the oxidized graphene by using a potassium permanganate graphite oxidizing method; adding enough H2O2 in the mixed solution, and reducing the manganese element into divalent manganese ions; adding tervalent ferric salt and divalent manganese salt, uniformly stirring the mixture, then, adding an alkaline solution in the mixed solution, adjusting the pH value of the solution to 8-13, then, heating the mixed solution to 70-99 DEG C, adding a reducing agent, and stirring for 0.5-24h to obtain a suspension liquid; and magnetically separating the suspension liquid and drying to obtain the manganese ferrite nanoparticle-graphene compound. According to the preparation method of the manganese ferrite nanoparticle-graphene compound, potassium permanganate used when the oxidized graphene is prepared can be sufficiently utilized so that the potassium permanganate can be converted into a nanomaterial containing manganese ferrites; and the preparation method has the characteristics of simplicity, environment friendliness, low cost and the like.

The invention discloses a double-effect optical Fenton denitrification method of manganese ferrite or a carbon composite material of the manganese ferrite. The method comprises the following steps: at least under irradiation of ultraviolet light or visible light, preferably under the irradiation of the sunshine, degrading ammonia nitrogen in water by taking manganese ferrite and/or a manganese ferrite-carbon composite material as an optical Fenton catalyst, wherein the manganese ferrite-carbon composite material mainly comprises manganese ferrite, graphene and/or active carbon; and the manganese ferrite is distributed on a graphene interface or coated by the active carbon. By utilizing catalytic circulation of Mn (III) and Mn (II) and the catalytic circulation of Fe (III) and Fe (II), the method disclosed by the invention can be used for oxidizing the ammonia nitrogen into nitrogen gas by one step under the irradiation of various wavelengths so as to realize rapid and high-efficiency degradation of the ammonia nitrogen in water; and moreover, the adopted optical Fenton catalytic material can be separated from water by an externally applied magnetic field and is recyclable, low in cost and beneficial for environmental protection.

The invention adopts an in-situ oxidation polymerization method and enables the polyaniline to be wrapped on the surface of the magnetic ferrate, and a series of ferrate/polyaniline magnetic nano composite materials can be prepared by using the method and comprise cobalt ferrite/polyaniline, nickel ferrite/polyaniline, copper ferrite/polyaniline, zinc ferrite/polyaniline and manganese ferrite/polyaniline and the like. A prepared ferrate/polyaniline magnetic nanometer catalytic agent has obvious preferential adsorption performance and good photoelectrical activity, and has good application prospects and economic benefits in the fields of adsorption, photocatalysis, lithium ion batteries and the like.

The invention provides a method for preparing multiaperture spherical magnetic ferrite (zinc ferrite, nickel ferrite, cobalt ferrite and manganese ferrite) by taking dodecylamine as a precipitator by a solvothermal method. The preparation method is characterized in that an ethylene glycol solution of ferric trichloride and chloride is used as a reaction solution; dodecylamine is used as the precipitator; and the ethylene glycol solution and the dodecylamine are stirred and mixed uniformly at the room temperature to form a liquid phase reaction solution; and the liquid phase reaction solution is transferred to a reaction kettle for hydrothermal reaction at 180-250 DEG C. Products are separated, washed and dried to obtain corresponding multiaperture ferrite powder after reaction. The preparation method has the characteristics of being low in raw materials, simple in process, convenient in operation, controllable in shape, and the like.

The invention discloses a preparation method and application of a graphene/cobalt-nickel-manganese ferrite nano-composite material. The preparation method comprises: adding a solution containing an iron source, a cobalt source, a nickel source and a manganese source into a dispersion containing graphene oxide drop by drop to obtain a mixed solution, adjusting pH of the mixed solution to greater than or equal to 8, adding a reducing agent into the mixed solution to obtain a precursor solution, transferring the precursor solution into a reactor, and carrying out microwave synthesis to obtain thegraphene/cobalt-nickel-manganese ferrite nano-composite material. The graphene/cobalt-nickel-manganese ferrite nano-composite material is composed of layered graphene and spherical cobalt-nickel-manganese ferrite nanoparticles. The spherical cobalt-nickel-manganese ferrite nanoparticles are uniformly dispersed on the layered graphene surface and between the layers. The graphene/cobalt-nickel-manganese ferrite nano-composite material has the characteristics of strong absorption intensity, effective absorption frequency bandwidth, thin thickness and light weight.

The invention discloses a method for degrading organic wastewater through heterogeneous ultraviolet catalytic oxidation. The method comprises the following steps of firstly preparing manganese ferrite by adopting a chemical co-precipitation method; sequentially adding the manganese ferrite, organic wastewater and hydrogen peroxide to an organic wastewater treatment device; and finally opening an ultraviolet source of the organic wastewater treatment device for radiation treatment of the organic wastewater. Through common action of ultraviolet Fenton reaction, the manganese ferrite and the hydrogen peroxide, the advantages of the ultraviolet Fenton reaction, the manganese ferrite and the hydrogen peroxide are fully developed to obtain a good organic wastewater treatment effect; H2O2 is catalyzed by using ultraviolet light and the manganese ferrite to degrade 50mg/L of 1.2.4-acid-simulated dye wastewater, so that the degradation rate can reach 85.93%; and representation is carried out by virtue of an X-ray diffractometer, and the result shows that the crystal structure of the manganese ferrite is free of an obvious difference before and after wastewater degradation, and the effect of catalytically degrading 1.2.4-acid by the manganese ferrite is free of an obvious change after being used for multiple times.

The invention relates to a water system neutral electrolyte-based asymmetric supercapacitor and a preparation method thereof, wherein the working voltage of the water system neutral electrolyte-based asymmetric supercapacitor is 1.6V. An anode active material of the water system neutral electrolyte-based asymmetric supercapacitor is made of a manganese dioxide nano sheet or manganese dioxide nano sheet/carbon nanotube composite material, and a cathode active material of the water system neutral electrolyte-based asymmetric supercapacitor is made of a manganese ferrite nano particles or a manganese ferrite nano particle/graphene composite material. A super capacitor electrolyte adopts a water system neutral sodium sulfate solution and is packaged into the super capacitor. The water system neutral electrolyte-based asymmetric supercapacitor has the advantages of high specific capacitance and energy density and excellent rate performance and cycle performance.

The invention discloses a bismuth-manganese-ferrite alloy. The alloy is characterized in that the weight percentages of the components of the alloy are as follows: 20 percent to 70 percent of bismuth, 20 percent to 70 percent of manganese, less than or equal to 2 percent of carbon, less than or equal to 0.8 percent of inevitable impurities, and the balance of ferrite. The alloy has the advantages of having practical alloying treatment and high yielding rate of bismuth and is an additive for free-cutting steel alloying treatment.

The invention discloses a preparation method of phase-change solar heat-absorption coating with a high heat absorption rate and belongs to the technical field of preparation of coating. According to the preparation method, after an emulsifier OP-10, liquid paraffin and hydrochloric acid are acidified and dissolved, a mixture is homogenized and emulsified under a heating state to obtain oil-in-water emulsion; outer holes of organic dispersion carbon nanotubes are blocked through black absorbents including a manganese ferrite black spinel pigment, carbon black, copper oxide powder and the like;on one hand, added titanium white has a light extinction effect; on the other hand, titanium dioxide is used as a photo-thermal absorption catalyst and can be compounded with silicon dioxide in thermal phase-change microcapsules, so that adjustable phase change temperature, shaping and phase change energy storage, and high energy storage density of a material are realized; polyethylene glycol 10000 with high latent heat and the liquid paraffin which easily has phase change at room temperature are utilized, so that the energy storage efficiency of the phase change material is improved; the surface of a carbon nanotube material is modified by utilizing p-nitroaniline diazonium salt; the distribution of a phase change substance in the phase change material is more uniform through high heat conductivity and high specific surface area of the carbon nanotube material, and convection and heat dissipation of the coating are reduced, so that the preparation method has a wide application prospect.

The invention discloses a catalyst for preparing butadiene from mixed C4 and a preparation method thereof. According to the catalyst, zinc ferrite serves as an active main body, and manganese ferrite and calcium ferrite serve as auxiliary active ingredients. The method comprises the following steps: mixing an iron salt solution, a zinc salt solution, a manganese salt solution and a calcium salt solution according to a certain ratio, so as to obtain a coprecipitation solution under the action of an alkaline solution; filtering and washing to obtain a catalyst sol, molding, drying and roasting the sol to obtain an axial fixed bed or constant-temperature fixed bed catalyst used for a fixed bed reaction process; preparing slurry from the sol and an adhesive with a certain ratio, and performing spray drying forming, drying and roasting to obtain a fluidized bed catalyst used for a fluidized bed reaction process. The catalyst has high activity and stability on dehydrogenation production of butadiene through the mixed C4 under the condition of the presence of oxygen, the conversion per pass of the butane in the mixed C4 is 88-93 percent, the selectivity on the butadiene is over 95 percent, and the catalyst can be applied to the field of industrial production of the butadiene.

The invention discloses a method for preparing a Mn-Zn-Ni ferrite magnetic material by using a low-grade nickel resource. The method comprises the following steps: performing fine grinding on a low-grade nickel resource, a manganese source, an iron source, a calcareous flux and a binder to prepare agglomerate; drying the agglomerate, performing primary roasting, and performing fine grinding and magnetic separating on the roasted agglomerate to obtain magnetic concentrate; mixing the magnetic concentrate and a zinc source, compacting the materials, and performing secondary roasting on a mouldedmaterial to obtain the Mn-Zn-Ni ferrite magnetic material. Compared with a traditional magnetic method that a pure substance is roasted to prepare the manganese ferrite, the method can directly employ mineral or secondary resource with large reserves as a raw material, the purity of the Mn-Zn-Ni ferrite is high, the magnetic property is good, and the method has the advantages of wide raw materialsource, simple process, low cost, and easy realization of industrial production.

The invention relates to a preparation method of nano-scale manganese ferrite catalyst with high specific surface area. The method comprises the following steps: (1)dissolving ferric salt and manganese slat in deionized water according to the proportion that the mole ratio of the Fe element to the Mn element is (1.8-2.2):1, and preparing a solution A; (2) adding an organic fuel in the solution A prepared in the step (1), then adding inert salt NaCl, dissolving and regulating pH to prepare a raw material solution; (3) burning the raw material solution prepared in the step (2), cleaning and drying to prepare the nano-scale manganese ferrite catalyst with high specific surface area. The method disclosed by the invention is relatively low in ignition temperature, less in preparation energy consumption, short in reaction time and high in speed.

The invention provides a fly ash glass bead-ferrite compound microwave absorbing material and a preparation method thereof. The compound microwave absorbing material comprises fly ash glass beads andferrite coating the surface of the fly ash glass beads, wherein the ferrite is selected from one or more of barium ferrite BaFe12O19, barium cobalt ferrite BaCox1Fe(12-x1)O19, nickel barium ferrite BaNix2Fe(12-x2)O19 and manganese ferrite MnFe12O19, wherein x1 is 0.5-1, and x2 is 0.5-1. The compound microwave absorbing material has excellent microwave absorbing performance by coating the fly ash glass beads with a specific type of ferrite, has light weight and certain sound absorption effect. The compound microwave absorbing material has a density of 0.6-1g/cm<3>, and has a sound absorption coefficient of 0.34-0.66 and echo reduced by 5-8dB in 1-5kHz.

The invention discloses a preparation method of a cysteine-functionalized magnetic hollow manganese ferrite nano composite adsorbent. The preparation method includes preparation of MnFe2O4 magnetic particles, preparation of magnetic hollow MnFe2O4 nano particles and surface cysteine functionalization of the magnetic hollow MnFe2O4 nano particles and other steps; MnFe2O4 having particle size of 150-250 nm is used as a base to prepare a hollow composite by using a mixed acid as an etching preparation; the hollow composite reaches 10-45 nm in pore size, 26.67-92.08 m<2>/g in specific surface area, and 32.4-41.18 emu/g in saturated magnetization intensity; in addition, the inner and outer surfaces of the hollow structure are subjected to cysteine functionalization at the same time; the hollowcomposite can better adsorb lead, chromium and other heavy metal ions to 79-81.5%. The preparation method herein is derived from traditional hydrothermal processes; the process is simple, and the yield is high; as the need of traditional preparation of mesoporous materials for adding a pore-forming agent template is omitted, the process steps are simplified, resources are saved, and the cost is lowered.

The invention relates to a lithium sulfur battery composite cathode material and a preparation method thereof. The composite cathode material is prepared by compounding ferrite with elemental sulfur.The ferrite is one of magnesium ferrite, zinc ferrite, copper ferrite or manganese ferrite. The preparation method includes: preparing a ferrite material by high temperature calcination method, and then conducting compounding with elemental sulfur by liquid phase method. The preparation method has a mature process and simple procedure, and is easy to acquire a high sulfur content composite cathodematerial. The lithium sulfur battery composite cathode material prepared by the invention utilizes the strong chemical adsorption effect of ferrite on polar lithium polysulfide, greatly inhibits thedissolution of lithium polysulfide in an ether electrolyte solution, accordingly slows down the shuttle effect, and then shows characteristics of high sulfur content, high sulfur utilization and highcycle stability.

The invention discloses a method for removing high-concentration thallium-containing industrial wastewater by manganese ferrite. The method comprises the steps as follows: 1, adding an oxidizing agentto high-concentration thallium-containing wastewater, performing stirring and oxidizing part of univalent thallium in water into trivalent thallium; 2, adding nanoscale manganese ferrite or a nanoscale manganese ferrite adsorbent coated with humic acid to the wastewater obtained in the step 1 to adsorb trivalent thallium and univalent thallium in water; 3, applying a magnetic field around the wastewater obtained in the step 2, taking a supernatant as obtained treated water, and performing solid-liquid separation on the wastewater; 4, removing the magnetic field after solid-liquid separation in the step 3, taking out a nanoscale manganese ferrite adsorbent solid, and performing desorption to obtain an enriched recovered thallium solution and a regenerated nanoscale manganese ferrite adsorbent. The method has the advantages as follows: nanoscale manganese ferrite is convenient to produce and low in preparation cost and can be repeatedly recycled after being prepared once, and heavy metal thallium can be recovered efficiently.