38 results about "Cobalt ferrite" patented technology

The invention discloses a sodium alginate embedded iron-carbon microcapsule material for repairing cadmium and arsenic polluted soil and a preparation method of the sodium alginate embedded iron-carbon microcapsule material, and belongs to the technical field of soil heavy metal pollution repairing materials. The material comprises straw biochar, high-iron steel slag powder, a sulfydryl acetylated chitosan-iron monatomic cluster compound, a boron-doped graphitized carbon coated cobalt ferrite nanosheet, sodium alginate, calcium chloride and sodium carbonate. Wherein the sulfydryl acetylated chitosan is prepared by reacting chitosan with sulfydryl acetic anhydride, dialyzing and drying, and performing solvothermal reaction with ferric nitrate under high pressure. The preparation method comprises the following steps: pyrolyzing and drying the straw biochar, reacting the high-iron steel slag with sulfuric acid, adding the biochar, adjusting the pH value, adding sodium carbonate, mixing to obtain an iron-carbon-based passivation material, mixing with two modified compounds, mixing with a sodium alginate solution, dropwise adding a calcium chloride solution, and stirring and curing. The material can be applied to remediation of cadmium and arsenic polluted soil.

Provided are cobalt ferrite particles having a micrometer-order average particle diameter and similar particle diameters. The cobalt ferrite particles are obtained by a method for producing cobalt ferrite particles, including performing a thermal treatment on an aqueous solution containing a divalent iron salt and a divalent cobalt salt stabilized by a complexing agent (ferrite precursor).

The application belongs to the technical field of electromagnetic shielding materials, and relates to MXene / BC@CoFe2O4 electromagnetic shielding aerogel and a preparation method thereof. The electromagnetic shielding aerogel is composed of MXene, bacterial cellulose (BC) and cobalt ferrite (CoFe2O4) grown by a co-precipitation method, contains anisotropic MXene porous structure, and BC@CoFe2O4 forms a three-dimensional magnetic network. Nano-magnetic particles CoFe2O4 are grown on bacterial cellulose by a co-precipitation method; the bacterial cellulose with the nano-magnetic particles CoFe2O4 grown thereon is mixed with a MXene dispersion liquid to occur liquid self-assembly, thereby forming an aerogel precursor; and a directional three-dimensional porous structure is formed by using a liquid nitrogen directional freezing method. The magnetic particles of the MXene / BC@CoFe2O4 electromagnetic shielding aerogel can cause magnetic loss to electromagnetic waves, the MXene with good electrical conductivity causes impedance mismatch with electromagnetic waves, reflects electromagnetic waves, and the bacterial cellulose can enhance the mechanical properties of the aerogel.

This invention relates to the field of hydrogen energy technology, specifically to a photocatalytic water splitting method for hydrogen production. It addresses the problems of harsh reaction conditions, low hydrogen production efficiency, and poor catalyst cycle stability in existing photocatalytic hydrogen production methods. Specifically, it uses water as the reaction medium, adds a catalyst and an electron sacrificial agent, and achieves hydrogen production through water splitting under visible light irradiation. The catalyst is prepared from cobalt ferrite, indium zinc sulfide, and biochar, and the electron sacrificial agent is triethanolamine. This method enhances the separation and transport of photogenerated carriers through the synergistic effect of the catalyst and electron sacrificial agent, resulting in high hydrogen production efficiency, strong stability, simple process, and controllable cost. Furthermore, hydrogen energy, as a zero-carbon energy source, can replace fossil fuels, reducing pollution and carbon emissions at the source, contributing to the dual carbon goals, and providing an efficient solution for large-scale hydrogen production, possessing both industrial application and ecological environmental value.

The invention discloses a preparation method of a charcoal-loaded cobalt ferrite magnetic composite catalytic material, which is specifically implemented according to the following steps: step 1, selecting green tea as a biomass precursor, and carrying out carrier WT pretreatment; step 2, preparing a magnetic composite catalytic material of biochar loaded cobalt ferrite; step 2.1, preparing a suspension; step 2.2, preparing a solid product; step 2.3, preparing a dried precursor; and step 2.4, preparing the magnetic composite catalytic material of the biochar loaded cobalt ferrite. According to the method, the reaction rate is remarkably increased, the problem of magnetic agglomeration of active components is solved, non-free radical dominance is achieved, the anti-interference performance is high, and efficient magnetic recovery and waste utilization are achieved. The invention further discloses the magnetic composite catalytic material of the biochar loaded cobalt ferrite and application of the magnetic composite catalytic material.

The invention discloses an extraction process of chaste tree twig oil in the technical field of plant essential oil extraction. An ethanol aqueous solution is adopted for extraction, ultrasonic treatment and a composite enzymolysis technology are combined, the chaste tree twig cell structure is effectively destroyed, and the grease extraction rate is remarkably increased. And then selectively adsorbing impurities in the extracting solution by using a specially-made cobalt ferrite-deep eutectic solvent-biochar magnetic composite material, and realizing rapid separation through an external magnetic field. And the alkalescent ethanol water solution is adopted for elution, so that the structure stability of the deep eutectic solvent is protected while impurities are effectively desorbed. And finally, carrying out rotary evaporation and column chromatography refining to obtain the high-quality vitex negundo oil. The process integrates various extraction and purification technologies, has the advantages of high extraction efficiency, mild operation conditions, small environmental pollution and the like, and is particularly suitable for efficient extraction and refining of the vitex negundo oil.

This invention relates to the field of lightweight wood-plastic composite materials, specifically to an antistatic lightweight wood-plastic composite material and its preparation method, which addresses the problems of insufficient antistatic properties and high density in existing wood-plastic composite materials. The method involves mixing an antistatic agent with high-density polyethylene, extruding, cooling, crushing, and sieving to obtain an antistatic masterbatch. Modified wood flour, high-density polyethylene, maleic anhydride graft compatibilizer, antioxidant, 2-hydroxy-4-methoxybenzophenone, and γ-aminopropyltriethoxysilane are then mixed, cooled, and the antistatic masterbatch is added for further mixing. The mixture is fed into a twin-screw extruder, and cobalt ferrite-coated hollow glass microspheres are added. After extrusion, cooling, and crushing, the mixture is then subjected to secondary molding in a single-screw extruder, gradient cooling for shaping, and traction cutting to obtain the antistatic lightweight wood-plastic composite material. This material possesses excellent antistatic properties, low density, and lightweight characteristics, along with good flexural strength and impact strength, low water absorption, and excellent water resistance.

The invention discloses a polyaluminum ferric chloride flocculant as well as a preparation method and application thereof, and belongs to the technical field of sewage treatment.The preparation method comprises the steps that cobalt ferrite is loaded on the surface of nano mesoporous silica through a coprecipitation-calcination method, supported silica is obtained, then amination modification and tartaric acid modification are performed by using a silane coupling agent KH550, and the polyaluminum ferric chloride flocculant is obtained. And finally, blending the composite silicon dioxide with an aluminum salt, an iron salt and hydrogen peroxide under an acidic condition, and forming and loading a polyaluminum ferric chloride flocculation layer on the surface through in-situ hydrolytic polymerization and catalytic oxidation synergy to obtain the polyaluminum ferric chloride flocculant. Quadruple synergy of magnetic separation, catalytic oxidation, deep adsorption and enhanced flocculation is realized, and suspended matters, soluble organic matters, phosphorus and chromaticity are efficiently removed.

The invention discloses a core-shell adsorption material for recycling precious metal in acid wastewater and a production process thereof, and relates to the technical field of precious metal adsorption and separation. Polyvinylidene fluoride is used for wrapping a magnetic material cobalt ferrite to prepare a carrier with a core-shell structure, the magnetic material cobalt ferrite is used as a core, a polyvinylidene fluoride film layer is used as a shell layer, then polyethyleneimine is grafted on the surface of polyvinylidene fluoride through a chemical reaction, and the magnetic material cobalt ferrite / polyvinylidene fluoride composite material is obtained. Finally, carboxymethyl chitosan which can adsorb palladium and platinum and is friendly to microorganisms is introduced to polyethyleneimine molecules through a chemical reaction, and efficient adsorption of palladium and platinum in the acid wastewater is achieved through cooperation of polyethyleneimine, carboxymethyl chitosan and microorganisms loaded on the surfaces of the polyethyleneimine, carboxymethyl chitosan and the microorganisms.

Provided are cobalt ferrite particles having a micrometer-order average particle diameter and similar particle diameters. When a cobalt ferrite precursor is treated at a high temperature and a high pressure, an oxidation reaction is caused in the presence of a complexing agent, thereby obtaining intended cobalt ferrite magnetic particles.

The invention discloses cobalt ferrite, a high-permeability iron-silicon magnetic powder core and a preparation method and application of the high-permeability iron-silicon magnetic powder core, and relates to the field of magnetic materials. The preparation method comprises the following steps: mixing and coating cobalt ferrite nanoparticles and phosphorylated magnetic powder, mixing and coating with an insulating coating agent, mixing and coating with a release agent, and carrying out compression molding and heat treatment to obtain the high-permeability iron-silicon magnetic powder core. According to the FeSi-cobalt ferrite magnetic powder core and the preparation method thereof, the FeSi soft magnetic alloy powder is subjected to insulation coating by adopting cobalt ferrite magnetism with high magnetic induction intensity, gaps among the magnetic powder can be effectively filled, the content of a magnetic medium is increased, the magnetic dilution effect is reduced, and the FeSi-cobalt ferrite magnetic powder core has high magnetic conductivity, low loss and excellent comprehensive electromagnetic performance.

The invention provides a method and system for removing high-concentration complex cyanogen in gold extraction wastewater, and relates to the technical field of sewage treatment.The method comprises the steps that the pH of the gold extraction wastewater is adjusted to 8-10, and pretreated wastewater is obtained; adding a cobalt ferrite particle catalyst into the pretreated wastewater, and introducing ozone to obtain oxidized effluent; dividing the oxidized effluent into a solution A and a solution B according to a volume ratio, oxidizing the solution A by using anaerobic ammonium oxidation bacteria under the condition of low dissolved oxygen, and mixing the oxidized solution A with the untreated solution B to obtain a mixed solution; enabling the mixed solution to react with anaerobic ammonium oxidation bacteria through a porous adsorption material, and recovering the cobalt ferrite particle catalyst for recycling. According to the method, the removal rate of the high-concentration complex cyanogen can be effectively increased, thorough mineralization of the complex cyanogen is achieved, and the core problem that the complex cyanogen is difficult to degrade is solved; and the method and the system have relatively high load resistance, are simple and convenient to operate and have good adaptability.

Provided are: a method for producing composite particles in which seed particles and cobalt ferrite particles can be synthesized with relatively low energy, the composite particles having a particle diameter within a specific range, having a circular shape with a predetermined average circularity, and having specific magnetic characteristics; composite particles of seed particles and cobalt ferrite particles manufactured by this manufacturing method have a circular shape having a predetermined average circularity, have specific magnetic properties, and have uniform particle diameters. The provided method for manufacturing composite particles of seed particles and cobalt ferrite particles comprises: a step in which a ferrous salt and a cobalt salt are stabilized by a complexing agent in an aqueous solution to prepare a ferrite precursor; a step in which spherical or substantially spherical seed particles are added to the ferrite precursor; and a step in which the ferrite precursor is additionally heat-treated.

This invention provides cobalt ferrite, its preparation method, and its application, belonging to the field of water treatment technology. The preparation method provided by this invention includes the following steps: (1) mixing cobalt salt, iron salt, and water to obtain a mixed solution; (2) mixing the mixed solution obtained in step (1) with an alkaline solution and carrying out a hydrothermal reaction to obtain cobalt ferrite; the temperature of the hydrothermal reaction is 155–165°C. This invention uses cobalt salt and iron salt as raw materials to prepare cobalt ferrite through a hydrothermal reaction. By controlling the temperature of the hydrothermal reaction, the obtained cobalt ferrite also contains iron(III) oxide (Fe3O4). The interaction between the two results in a faster removal rate of the prepared cobalt ferrite when used for pollutant removal in water, allowing for pollutant degradation in a shorter time. The results of the examples show that when the cobalt ferrite prepared by this invention is used to remove bisphenol A from water, its removal rate reaches nearly 100% within 5 minutes.

The invention discloses a preparation method of carbonyl iron powder, cobalt ferrite and silicon dioxide wave-absorbing powder, which comprises the following specific steps: weighing ferrite synthetic components, spherical carbonyl iron powder and tetraethoxysilane according to a ratio, the ferrite synthetic components comprise 52-56 mol% of Fe2O3 and the balance of CoO, and the spherical carbonyl iron powder and the tetraethoxysilane are mixed according to a certain ratio to prepare the carbonyl iron powder, cobalt ferrite and silicon dioxide wave-absorbing powder, and the spherical carbonyl iron powder and the tetraethoxysilane are mixed according to a certain ratio to prepare the carbonyl iron powder, cobalt ferrite and silicon dioxide wave-absorbing powder. The carbonyl iron powder, cobalt ferrite and silicon dioxide wave-absorbing powder is finally obtained through the steps of ball milling, stirring, drying, primary sintering, mixing, secondary sintering and the like. The method for preparing the carbonyl iron powder, cobalt ferrite and silicon dioxide wave-absorbing powder is simple and convenient in process, safe and low in cost, and after the carbonyl iron powder, cobalt ferrite and silicon dioxide wave-absorbing powder is used for preparing wave-absorbing products, the excellent performance of broadband strong absorption is shown in the frequency band of 2-18 GHz.

To provide magnetic particles (cobalt ferrite) having an average particle size of μm order and uniform particle size.SOLUTION: Cobalt ferrite magnetic particles are obtained by heat-treating a cobalt ferrite precursor in the presence of sulfite.SELECTED DRAWING: Figure 1

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.

The application provides a method and system for removing high-concentration complex cyanide in gold extraction wastewater, and relates to the technical field of sewage treatment. The method comprises the following steps: adjusting the pH of the gold extraction wastewater to 8-10 to obtain pretreated wastewater; adding a cobalt ferrite particle catalyst to the pretreated wastewater and introducing ozone to obtain oxidized effluent; dividing the oxidized effluent into solution A and solution B according to the volume ratio, oxidizing solution A under the condition of low dissolved oxygen by using anaerobic ammonia oxidation bacteria, mixing the oxidized solution A with untreated solution B to obtain a mixed solution; and reacting the mixed solution with porous adsorption material and anaerobic ammonia oxidation bacteria, and recycling the cobalt ferrite particle catalyst for circulation. The method used by the application can effectively improve the removal rate of high-concentration complex cyanide, realizes complete mineralization of the complex cyanide, solves the core problem of difficult degradation of the complex cyanide, has strong load resistance, is simple to operate, and has good adaptability.

The invention belongs to the field of biomedical materials, and discloses a magnetoelectric hydrogel microneedle, the magnetoelectric hydrogel microneedle comprises a backing and a microneedle array, the backing comprises hydrogel containing magnetic ionic liquid Fe-IL and thiolated chitosan, and the microneedle array comprises magnetoelectric nanoparticles and hydrogel; the magnetoelectric nano-particles are CB core-shell structure nano-particles of which the surface of magnetic nano cobalt ferrite (CFO) is coated with a piezoelectric responsive barium titanate (BTO) shell layer. The invention further discloses a preparation method of the magnetoelectric hydrogel microneedle and application of the magnetoelectric hydrogel microneedle in preparation of products for treating bone tissue repair. During preparation, CB gradient distribution is regulated and controlled through an external magnetic field, the magnetoelectric response efficiency is enhanced, when the magnetoelectric hydrogel is applied to preparation of products for treating bone tissue repair, the osteogenesis efficiency can be improved, the adaptability of the magnetoelectric hydrogel to the bone tissue can be enhanced, and efficient electrical stimulation repair of the bone tissue is achieved.

The invention discloses an MXene / PEDOT: PSS / CNT (at) CoFe2O4 electromagnetic shielding film and a preparation method thereof. A bottom layer of the film is MXene, a transition layer is MXene / PEDOT: PSS, an absorption mixing layer is an MXene / PEDOT: PSS / CNT (at) CoFe2O4 layer, and the bottom layer, the transition layer and an upper layer are sequentially subjected to suction filtration; the preparation method comprises the following steps: forming a gradient structure from high conductivity to high impedance by regulating and controlling the mass fractions of PEDOT: PSS and magnetic powder CNT coated CoFe2O4 in different layers, and promoting multiple reflection and loss of electromagnetic waves in the film by combining a magnetoelectric synergistic effect and matching interface impedance; magnetic particles of cobalt ferrite CoFe2O4 are loaded on carboxylated carbon nanotubes MWCNT-COOH by adopting a coprecipitation method, so that the absorption performance of the film is enhanced. The film is prepared through layer-by-layer vacuum filtration and hot pressing, and has high electromagnetic shielding effectiveness, strong absorption characteristic, flexibility and mechanical strength.

The invention relates to the technical field of ferrite magnetic materials, in particular to modified manganous-manganic oxide and application thereof in soft magnetis.The modified manganous-manganic oxide and the application thereof in the soft magnetis.The modified manganous-manganic oxide and the application thereof in the soft magnetis.According to the modified manganous-manganic oxide and the application thereof in the soft magnetis.The modified manganous-manganic oxide and the application thereof in the soft magnetisms are formed by using zinc ferrite as an inner layer and using polyvinylpyrrolidone as a fiber template through the electrostatic spinning technology; the preparation method comprises the following steps: taking a trimanganese tetroxide composite cobalt ferrite as an outer layer, namely a modified trimanganese tetroxide fiber material, taking the trimanganese tetroxide composite cobalt ferrite as a fiber skeleton, and taking modified polysiloxane borane and silicone resin as wrapping materials to construct a three-dimensional anisotropic soft magnetic composite material; therefore, the contradictory problems that a traditional soft magnetic material is high in eddy-current loss under high frequency, and saturation flux density and high-frequency magnetic conductivity are difficult to achieve at the same time are solved.

The application relates to a cobalt-iron bimetallic selenide composite material with one-dimensional morphology and a preparation method and application thereof. The application prepares a spinnable precursor sol by taking cobalt nitrate, iron nitrate and polyvinylpyrrolidone as reaction raw materials, obtains cobalt ferrite nanofibers through electrospinning and calcination, then takes the prepared cobalt ferrite nanofibers, hydrazine hydrate and selenium powder as raw materials to carry out in-situ selenization through a hydrothermal method, and thus forms an electrocatalyst cobalt-iron bimetallic selenide composite material with one-dimensional morphology. The composite material electrocatalyst prepared by the application has good oxygen evolution properties, and the overpotential under a current density of 10 mA cm ‑2 is only 283 mV, the Tafel slope is extremely small, meanwhile, small electrochemical impedance is beneficial to electron transmission; after 1000 cycles of CV circulation, the polarization curve does not obviously attenuate, indicating that the stability is good; the preparation method of the application has simple steps and has the potential for large-scale production.

This invention relates to the field of ferrite magnetic materials technology, specifically to a modified manganese tetroxide and its application in soft magnets. The invention provides a modified manganese tetroxide and its application in soft magnets, which utilizes electrospinning technology with polyvinylpyrrolidone as a fiber template to form a composite nanofiber material with zinc ferrite as the inner layer and manganese tetroxide and cobalt tetraoxide ferrite as the outer layer, i.e., a modified manganese tetroxide fiber material. Using this as the fiber skeleton, modified polysiloxane and silicone resin are used as encapsulating materials to construct a three-dimensional anisotropic soft magnetic composite material. This solves the contradictory problems of high eddy current loss and difficulty in simultaneously achieving saturation magnetic induction intensity and high-frequency permeability in traditional soft magnetic materials at high frequencies.

The application relates to a method for preparing a cobalt ferrite epitaxial film by utilizing a plasma field activation auxiliary method, which comprises the following steps: firstly, depositing a CFO precursor film through a magnetron sputtering technology; secondly, placing the CFO precursor film into a PECVD vacuum annealing furnace to perform vacuum plasma field activation; finally, performing high-temperature annealing treatment under Ar and O2 atmospheres respectively; after the annealing is completed, taking out the product in the furnace to obtain a CFO epitaxial film. The application overcomes the problems of long preparation period, limited film size, long annealing time, low crystallization degree, residual oxygen vacancies and the like in the existing CFO epitaxial film preparation method, has the advantages of shortening the preparation period and improving the film surface activity, and the product has the advantages of large size, epitaxial preferred orientation, high crystallization degree, elimination of oxygen vacancies and the like, so that the performance of the CFO epitaxial film can be further improved.

This invention discloses a thermally conductive filler, a thermally conductive PES composite material, and their preparation method. The preparation method of the thermally conductive filler includes: adding cobalt salt, iron salt, and sodium acetate to an organic solvent, mixing them evenly, and then heating to react to obtain cobalt ferrite; adding cobalt ferrite, tungsten carbide, and gallic acid to an ethanol aqueous solution, mixing them evenly, and then heating to react to obtain the thermally conductive filler. The above-mentioned thermally conductive filler is added to the thermally conductive PES composite material. Cobalt ferrite is deposited on the surface of tungsten carbide, thereby reducing the gaps between tungsten carbide particles and improving its thermal conductivity. Furthermore, due to the magnetic properties of cobalt ferrite, the thermally conductive filler can be directionally distributed in the PES matrix, forming an ordered thermally conductive pathway, thereby improving the thermal conductivity of the PES composite material. In addition, the phenyl groups on the gallic acid molecules are adsorbed onto tungsten carbide through π-π interactions, further improving the thermal conductivity and dispersibility of the thermally conductive filler. Thus, the thermal conductivity of the PES composite material is significantly improved.

The application discloses a low-loading spinel-type cobalt ferrite / activated carbon composite material and a preparation method and application thereof in degrading non-edible oil wastewater, and belongs to the technical field of environmental functional materials. The application first pretreats activated carbon; then dissolves iron salt and cobalt salt in deionized water to prepare a precursor solution, and then adds the pretreated activated carbon into the precursor solution, stirs and then ultrasonically impregnates; finally, dries the impregnated mixed system, calcines under an inert atmosphere, and naturally cools to obtain the composite material. The composite material prepared by the application comprehensively combines the synergistic effect of carbon defect sites, CoFe2O4 active phase and surface oxygen-containing functional groups, can efficiently activate peroxymonosulfate, degrades the refractory organic pollutants in non-edible oil wastewater through a free radical and non-free radical synergistic effect pathway, and verifies the degradation performance by taking DEP as a model pollutant.

The application discloses a composite admixture for inhibiting alkali-aggregate reaction, and each component and weight percentage thereof are as follows: 10-20 parts of nano-cobalt ferrite, 20-30 parts of silica fume, 45-55 parts of modified tuff powder, 2-4 parts of sodium fatty alcohol polyoxyethylene ether sulfate, 2-4 parts of long-chain alkyl dimethyl amine, and 4-6 parts of modified nylon fiber. + , K + , and Na + , K + contact with active SiO2 during the reaction process, and the volume deformation is controlled by using the modified fiber uniformly dispersed in multiple angles and multiple levels, so that the alkali-aggregate reaction can be effectively inhibited; the composite admixture can replace traditional cementitious materials such as cement in a large amount, and can effectively consider the good use performance of the obtained concrete, and has significant economic and environmental benefits; and the preparation method is relatively simple, the cost is relatively low, and is suitable for popularization and application.

The invention discloses a carbon fiber-based wave-absorbing agent, a preparation method thereof and a wave-absorbing material. The carbon fiber-based wave absorbing agent comprises carbon fibers and cobalt ferrite nanosheets, wherein the cobalt ferrite nanosheets are arranged on the surfaces of the carbon fibers. Compared with a single-component carbon fiber or ferrite wave-absorbing material, the carbon fiber-based wave-absorbing agent disclosed by the invention realizes uniform compounding and synergistic interaction of magnetic-dielectric components, effectively solves the problems of poor interface bonding, non-uniform dispersion of magnetic components and the like in a traditional carbon-based wave-absorbing material, simplifies the preparation process while improving the electromagnetic wave absorption performance, and is suitable for industrial production. The production cost is reduced, and the method has a good application prospect.

The invention discloses a BiFeO3 / CoFe2O4 two-dimensional single-crystal heterojunction multiferroic material, a solid-phase sintering preparation method and application. The solid-phase sintering preparation method comprises the following steps: 1) preparing a solid mixture of single-crystal bismuth ferrite and cobalt ferrite; 2) adding a sodium dodecyl benzene sulfonate solution with a certain concentration into the solid mixture to obtain a reaction material; 3) uniformly mixing the reaction materials by ultrasonic oscillation; 4) putting the vibrated reaction material into a drying oven to remove moisture; the preparation method of the BiFeO3 / CoFe2O4 two-dimensional single crystal heterojunction multiferroic material.Raw materials used in the preparation method are low in toxicity, and the BiFeO3 / CoFe2O4 two-dimensional single crystal heterojunction multiferroic material has the advantages that the BiFeO3 / CoFe2O4 two-dimensional single crystal heterojunction multiferroic material is relatively friendly to the environment and simple in preparation process, large-scale industrial production can be achieved more easily, and the like.

The invention belongs to the technical field of catalysts, and relates to a cerium-doped cobalt ferrite catalyst and a preparation method and application thereof, the preparation method comprises the following steps: 1) dissolving cobalt nitrate hexahydrate, ferric nitrate nonahydrate and cerium nitrate hexahydrate in water to form a mixed solution; 2) adding a urea solution into the mixed solution, and carrying out a heating reaction to obtain a precipitate; 3) washing and drying the precipitate to obtain a precursor; and 4) calcining the precursor to obtain the cerium-doped cobalt ferrite catalyst. By doping Ce ions, the electronic structure of cobalt ferrite is optimized, charge transfer is promoted, catalytic active sites are increased, the specific surface area is increased, and the catalytic performance is improved; ce ions have reversible Ce < 3 + > / Ce < 4 + > redox pairs and controllable oxygen vacancies, so that adsorption and activation of oxygen are facilitated, the reduction temperature is reduced, and the catalytic performance is improved.