57 results about "Magnetic carbon" patented technology

A magnetic toner comprising a toner particle comprising a binder resin and a magnetic body, wherein the binder resin comprises a styrene-acrylic resin, the styrene-acrylic resin comprises a monomer unit represented by Formula (1):where, in Formula (1), R1 represents a hydrogen atom or a methyl group; and R2 represents a linear alkyl group having CB carbon atoms, CB being an integer from 10 to 15; the magnetic body comprises an alkyl group having CM carbon atoms, on a surface of the magnetic body, CM being an integer from 4 to 20; CB and CM satisfy Formula (3):|CM−CB|≤10  (3), andin a cross-sectional observation of the magnetic toner using a transmission electron microscope, a coefficient of variation of an occupied area ratio of the magnetic body in a specific square grid, is 80.0% or lower.

The invention belongs to the technical field of wastewater treatment, and discloses a development method of magnetic sludge carbon, functional equipment for strengthening efficient biological treatment of wastewater and application of the functional equipment. On one hand, a nitrogen-doped carbon precursor is prepared by co-fermentation of excess sludge and agricultural and forestry wastes, and an LDH structure is formed through iron-nickel bimetal loading, so that the magnetism and catalytic performance of the material are improved, and the biological treatment effect of wastewater is enhanced. On the other hand, periodic deformation of the gel filler is induced through the rotating magnetic field, and the mass transfer limitation of a traditional biological membrane is broken through; and in combination with dissolved oxygen gradient regulation and control and Fenton-like catalytic activity of magnetic carbon, an anoxic nitrification-micro-aerobic oxidation stage treatment system is constructed. The electromagnetic separation and ultrasonic regeneration system realizes dynamic recovery of magnetic carbon and regeneration of surface active sites, and ensures the long-term operation stability of the system.

The invention discloses a preparation method and application of a coupling agent modified sludge-based magnetic carbon material, and the method comprises the following operation steps: (1) pyrolyzing a Fenton sludge raw material in a nitrogen protective atmosphere to obtain sludge-based magnetic charcoal; (2) placing the sludge-based magnetic biochar in a sodium hydroxide solution for oxidation hydroxylation, filtering, and drying to obtain oxidized magnetic biochar; and (3) preparing a 3-aminopropyltriethoxysilane (APTES) solution with the concentration of 0.1 g / L, dispersing the oxidized magnetic biochar obtained in the step (2) in the APTES solution according to the solid-to-liquid ratio of 1: 100 (g: mL), reacting for 24 hours at the temperature of 50 DEG C under the acidic condition, filtering and drying to obtain the coupling agent modified sludge-based magnetic carbon material. According to the method, the Fenton sludge solid waste is used as a carbon material precursor, meanwhile, an endogenous iron element is provided, synchronous carbonization and magnetization are achieved through pyrolysis, and therefore the micro-plastics in the water body can be efficiently removed.

The application relates to an oil-displacing demulsifier and a preparation method thereof. First, magnetic carbon nanotubes are prepared by depositing ferric chloride hexahydrate and copper sulfate pentahydrate on the surface of carbon nanotubes; second, hyperbranched polymers with terminal double bonds are prepared; then, the two are mixed to obtain hyperbranched grafted magnetic carbon nanotubes; finally, allyl polyoxyethylene ether is continuously polymerized in situ to obtain the oil-displacing demulsifier. The oil-displacing demulsifier prepared by the application is suitable for oil-displacing demulsification treatment of coking wastewater in the early stage. The coking wastewater is complex in composition, contains little oil, but contains a lot of organic components. The polyether with multiple branched chains can form a net trapping effect in the water body, so that oil and water can be quickly gathered and separated in an emulsified state, and the oil removal rate can reach more than 97%. Meanwhile, the demulsifier has magnetism, can be recycled through magnetic separation, and the oil removal rate can still reach more than 92% after ten cycles of demulsification. The oil removal effect is good with a small amount of addition, and the coking wastewater treatment process is simplified.

The invention relates to the field of radar wave-absorbing materials, in particular to a magnetic carbon nanobelt wave-absorbing agent and a preparation method thereof. The magnetic carbon nanobelt wave-absorbing agent comprises nitrogen-doped carbon converted by polyimidazolium salt and magnetic nanoparticles carbonized and converted by ferric iron salt; the average particle size of the magnetic nanoparticles is 5nm-20nm, and the mass loading capacity of the magnetic nanoparticles is 20%-50%. The magnetic carbon nanobelt wave-absorbing agent provided by the embodiment of the invention can give consideration to dielectric loss and magnetic loss, and the wave-absorbing performance of the material is improved.

The application discloses an oxygen-vacancy-rich manganese dioxide magnetic carbon-based composite catalyst and a preparation method and application thereof in activating peroxymonosulfate to degrade bisphenol S. Wheat straw is used as a biochar raw material to prepare magnetic biochar, which is dispersed into a MnSO4*H2O solution and stirred, KMnO4 solution is added and stirred, the obtained material is transferred into a hydrothermal high-pressure kettle with a quartz liner, the high-pressure kettle is then transferred to a set temperature, after the reaction is completed, the material in the high-pressure kettle is cooled to room temperature, the reacted material is then filtered, the filtered solid is separated through a magnetic field, the solid with magnetism is washed and dried to obtain a catalyst precursor, and the catalyst precursor is aged through an NH4Cl solution to obtain the composite catalyst MBMN rich in OVs. The MBMN composite catalyst prepared by the application has low raw material cost, simple preparation process and high practicability.

The application discloses a magnetic carbon nanomaterial hydrogel, a preparation method thereof and seawater desalination application. The magnetic carbon nanomaterial hydrogel comprises a hydrogel, carbon nanomaterial and magnetic nanoparticles distributed in the hydrogel. The preparation method comprises the following steps: 1) mixing the hydrogel, the carbon nanomaterial and the magnetic nanoparticles to obtain a mixed solution; 2) freezing the mixed solution obtained in the step 1) to obtain a frozen product; 3) thawing the frozen product obtained in the step 2); 4) repeating the freezing in the step 2) and the thawing in the step 3) to obtain the magnetic carbon nanomaterial hydrogel. The magnetic carbon nanomaterial hydrogel prepared by the application can realize dynamic compression self-drainage through geometric deformation of an elastic magnetic evaporation body under the action of a magnetic field, and can improve the water evaporation rate of a photothermal interface water evaporation body.

The invention provides a solid-state luminous magnetic carbon dot fluorescent material as well as a preparation method and application thereof. Ammonium ferric citrate is taken as an iron source, basic fuchsin is taken as a carbon source, polyethyleneimine is taken as a cross-linking agent, and magnetic Fe3O4 is formed through reaction of polyethyleneimine and ammonium ferric citrate; magnetic Fe3O4 and carbon dots formed by a carbon source are connected through dehydration condensation of amino of polyethyleneimine and carboxyl on the surface of basic fuchsin, the solid-state light-emitting magnetic carbon dot fluorescent material in which the carbon dots and the magnetic Fe3O4 are dispersed and are not in contact is obtained, AIQ does not occur in the aggregate, solid-state light emitting of the magnetic carbon dot fluorescent material can be achieved, and the magnetic carbon dot fluorescent material has good application prospects. The magnetic carbon dot fluorescent material can be applied to fingerprint extraction.

The invention discloses a magnetic carrier composite biological agent and a preparation method thereof. The preparation method comprises the following steps: preparing a nano magnetic carbon base; preparing a functional bacterium colony stock solution; preparing a nano magnetic carbon base / functional bacterium compound bacterium solution through the nano magnetic carbon base and the functional bacterium colony; preparing emulsified vegetable oil; preparing a magnetic carrier composite biological agent from the emulsified vegetable oil and the nano magnetic carbon-based / functional bacteria composite bacterial liquid; according to the prepared composite biological agent, the problems of insufficient tolerance under high concentration, low efficiency under low concentration, long repair period and the like of a biological method are solved at the same time, and finally efficient, long-acting and small-disturbance repair for halogenated hydrocarbon in a wide concentration range is achieved.

The application discloses a magnetic carbon aerogel with infrared-radar dual stealth function and a preparation method thereof. First, nickel chloride hexahydrate, sodium hydroxide and cetyltrimethylammonium bromide are dissolved in ethylene glycol, hydrazine hydrate is added, and then the mixture is reacted under heating and magnetic field to prepare a nickel chain; then a silanol solution after hydrolysis and condensation is blended with a bacterial cellulose gel to prepare a BC precursor solution, the BC precursor solution is uniformly mixed with the nickel chain and a carbon material dispersion liquid, and then directional freezing and freeze drying are performed to prepare the magnetic carbon aerogel. The method effectively solves the technical problems that in the prior art, it is difficult for infrared-radar dual stealth materials to maintain low infrared emissivity and light weight while realizing wide-frequency, strong and stable radar wave absorption performance, especially after the introduction of a magnetic component, oxidation is easily caused, dispersion is uneven, and the infrared characteristics are deteriorated.

The invention belongs to the technical field of electromagnetic compatibility, and discloses a method for preparing a light magnetic carbon composite electromagnetic compatibility material by inducing chelate salt through carbon nitride, which comprises the following steps: 1, fully dispersing metal chelate salt and graphitized carbon nitride to form a uniform mixture; and 2, carrying out temperature programming calcination treatment on the uniform mixture to obtain the target magnetic carbon composite material. According to the present invention, the construction of the rich porous structure is achieved, the preparation process is simple and environmentally friendly, the template method adopted for the conventional porous structure inevitably comprises the introduction and the removal of the template agent in the whole production process, the use of the acid, the alkali or the oxidizing agent is involved, and the harm and the pollution are serious; the adopted carbon nitride template can be decomposed in the high-temperature pore-forming process for preparing the wave-absorbing agent, so that the problem of subsequent template removal is avoided.

The invention discloses nitrogen-doped carbon nanotube array loaded magnetic carbon aerogel and a preparation method thereof.The method comprises the steps that cobalt salt and nickel salt are evenly dissolved in a biomass precursor aqueous solution, and a homogeneous solution is formed; adding a cross-linking aid to construct a three-dimensional network, and wrapping metal ions; performing freeze drying after directional freezing to form a directional porous structure; carrying out heat preservation and carbonization, converting the biomass into a porous carbon matrix, and reducing the cobalt / nickel salt into a uniformly embedded CoNi alloy; through two-stage heat treatment, the nitrogen-rich organic matter is decomposed to release a nitrogen source, and the vertical carbon nanotube array grows in situ. The material integrates CoNi alloy magnetic loss, carbon matrix dielectric loss and multistage structure scattering effect, realizes dielectric-electromagnetic cooperation, optimizes impedance matching, avoids strong surface reflection caused by high conductivity of a single carbon material, introduces polarization loss, widens an absorption frequency band, has excellent broadband efficient electromagnetic wave absorption performance, and is suitable for a complex electromagnetic environment.

The present application relates to a kind of tannin microenvironment limited bimetallic carbon-based catalyst and its preparation method and application.The zero-valent zinc-containing magnetic carbon nanotube (ZFC) prepared by iron ion modification and zinc powder sintering is solid-phase ground with waxberry tannin foam (TF), the tannin limited microenvironment is constructed in situ on the surface of catalyst, and finally the composite material (ZCF-TF) is prepared.The present application utilizes the high nucleophilic characteristics of polyphenol hydroxyl group of tannin, not only can in-situ capture leached free metal ions in the reaction system to realize "interface reconstruction", solve the problem of secondary pollution of heavy metal;More through the unique surface microenvironment, the local electronic structure of catalyst is changed, the traditional non-selective radical dilemma is successfully avoided, and the Fenton-like catalysis is changed into electron transfer (ETP) and singlet oxygen dominated non-radical path.The catalyst shows precise and efficient degradation ability to antibiotics in water body, and has strong anti-water quality background interference ability.

The utility model discloses a powder control structure of a discontinuous interface, which comprises a magnetic roller and a powder control sheet, and is characterized in that the powder control sheet comprises a cutter blade I and a cutter blade II, the top surface of the cutter blade I is contacted and rubbed with the magnetic roller, and the top surface of the cutter blade II is lower than the top surface of the cutter blade I, so that a step surface is formed on the side surface of the cutter blade I; and the magnetic carbon powder adsorbed by the magnetic roller from the powder bin can collide with the step surface to be rubbed. Therefore, the carbon powder is collided and rubbed with the step surface when passing through the position, so that the carbon powder is charged due to additional friction force, the upper layer and the lower layer of the magnetic carbon powder on the surface of the magnetic roller are easier to exchange, and the printing blackness and the carbon powder transfer printing rate are improved.

The application discloses a kind of methods for preparing magnetic carbon-based functional materials using algal residue, magnetic carbon-based functional materials and applications, belong to new material technical field and energy saving and environmental protection technical field.The algal residue is impregnated with sodium hydroxide in the method, and then treated by metal salt impregnation, high-temperature anaerobic activation, washing and drying to obtain the magnetic carbon-based functional materials.The method has the characteristics of simple production process, easy-to-obtain raw materials and high product solid-liquid efficiency.The method realizes the resource utilization of algal residue, and the prepared new material can be widely applied to the field of environmental protection, especially the field of water treatment and tetracycline degradation technology, and has good economic and social benefits.

The invention discloses CoNi alloy loaded nitrogen-doped magnetic carbon aerogel as well as a preparation method and application thereof, according to the method, a directional freezing method, a pyrolysis method and a solvothermal method are adopted to load CoNi on biomass derived carbon aerogel in situ, and a honeycomb-like magnetic nitrogen-doped carbon aerogel composite wave-absorbing material loaded with CoNi and a preparation method of the CoNi-loaded honeycomb-like magnetic nitrogen-doped carbon aerogel composite wave-absorbing material are constructed. Through the dielectric loss of the carbon aerogel, the CoNi alloy particles in the carbon aerogel provide magnetic loss, and the dielectric-electromagnetic synergistic effect is beneficial to optimization of impedance matching of the wave-absorbing material. Meanwhile, the multiple reflection and scattering of the electromagnetic waves in the directional honeycomb structure also help the dissipation of the electromagnetic waves.

The invention provides a method and a device for removing multiple pollutants in flue gas by using cross electro-acoustic modified magnetic carbon, and belongs to the field of atmospheric pollutant control. The method comprises the following steps: in a cross electro-acoustic modification device, utilizing an electro-acoustic synergistic effect to jointly activate a multi-element reagent to induce active free radical modified magnetic carbon, and then utilizing the modified magnetic carbon to induce oxidizing substances to oxidize and absorb various pollutants such as Hg0, As2O3, H2S, PH3 and CO in industrial airflow in a light-bubble micro-jet reaction kettle. The method has the outstanding technical advantages of simple technical device, high synergistic removal efficiency of multiple pollutants, high mixing and mass transfer efficiency of reaction media, energy conservation, low carbon, green and environment-friendly modification process and the like, and has a good industrial development prospect.

The application discloses a demulsifier for tar ammonia water and a preparation method thereof. The preparation method of the demulsifier for tar ammonia water comprises the following steps: step (1), FeCl3.6H2O and FeCl2.4H2O are added into a solvent, modified carbon black is added after stirring, ultrasonic treatment is conducted, ammonia water is added to adjust pH under stirring, separation, washing, and finally drying to constant weight to obtain magnetic carbon black; step (2), modified magnetic carbon black is prepared; step (3), carboxylated cyclodextrin, modified magnetic carbon black and a catalyst are added into water, stirring and reaction are conducted, separation, washing, and then drying to constant weight are conducted, and the demulsifier for tar ammonia water is obtained. The demulsifier with magnetism is prepared through modified carbon black, the demulsification capacity of the demulsifier is improved through synergistic effect of multiple groups, the prepared magnetic demulsifier can be reused, and has a good application prospect.

The application provides a method for enhancing electricity generation of a microbial fuel cell by modifying the interface between a free magnetic carbon three-dimensional biological anode and bacteria, and the method adopts a solvothermal method to prepare a hydrophilic magnetic nano Fe3O4@ formed porous carbon composite material which has strong electromagnetic performance, a large specific surface area and high biocompatibility, can be used as a three-dimensional biological anode in a microbial fuel cell (MFC), is beneficial to the adhesion of microorganisms and maximizes the colonization space of the microorganisms, can promote the extracellular electron transfer efficiency of bacteria and enhance interspecies electron transfer between bacteria and archaea as an excellent electron medium, improves the conversion rate of a biological anode and the output of electrons, and enhances electricity generation of the MFC.

The application discloses a preparation method of a carbonized wood-based electromagnetic shielding material with electrically-conductive and magnetically-conductive properties, which comprises the following steps: immersing Fe3O4@Graphene nanoparticles into the surface of wood after carbonization, and then performing chemical nickel plating to prepare the carbonized wood-based electromagnetic shielding material. The carbonized wood has good corrosion and insect prevention performance, is not easy to absorb water, and is a good moisture-proof wood with a contact angle of 126.2 degrees. Therefore, after the Fe3O4@Graphene nanoparticles are compounded on the surface of the carbonized wood, the chemical nickel plating can endow the carbonized wood with electromagnetic functional properties. By controlling the time for immersing the nanoparticles, the electromagnetic shielding performance of the carbonized wood composite material can be regulated. The conductivity of the carbonized wood composite material prepared after immersing the nanoparticles for 5 hours can reach 631.3 S / cm, and the average electromagnetic shielding efficiency of the carbonized wood composite material in a frequency range of 8.2 to 12.4 GHz can reach 70 dB, and some frequency bands can reach 80 dB.

The invention discloses a magnetic carbon quantum dot loaded platinum catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) obtaining an iron-nitrogen co-doped carbon quantum dot precursor solution; (2) enabling the iron-nitrogen co-doped carbon quantum dot precursor solution to penetrate through a filter head, slowly dropwise adding a settling aid while stirring, and then standing, centrifuging, washing and freeze-drying to obtain iron-nitrogen co-doped carbon quantum dots; and (3) obtaining the magnetic carbon quantum dot loaded platinum catalyst. The invention provides application of the magnetic carbon quantum dot loaded platinum catalyst in synthesis of halogenated aniline through homogeneous catalytic hydrogenation of halogenated nitrobenzene. According to the method, the yield and the purity of the carbon quantum dots can be increased, and the sizes of the carbon quantum dots can be controllable and more uniform. The catalyst provided by the invention has high activity and high selectivity on halogenated nitrobenzene; the catalyst is small in size, and a heterogeneous catalytic system can be approximately converted into a homogeneous-like system; and the homogeneous-like catalyst can be recycled by utilizing magnetism.

The invention belongs to the technical field of functional composite materials, and particularly relates to a hollow porous magnetic carbon fiber framework material, a composite coating with electromagnetic wave absorption and anti-corrosion functions, a preparation method and application. The hollow porous magnetic carbon fiber framework material is prepared by adopting a method comprising the following steps: transferring a mixture of nickel nitrate hexahydrate, 2, 5-dihydroxyterephthalic acid and DMF (Dimethyl Formamide) into a reaction kettle, and heating for reaction to obtain a nickel metal organic framework material; taking a mixture of PAN, copper nitrate monohydrate, a nickel metal organic framework material and PMMA as a shell layer solution, taking a polymethyl methacrylate solution as a core layer solution, and performing coaxial electrostatic spinning to obtain a core-shell structure nanofiber felt; and carrying out pre-oxidation, template sacrifice and carbonization treatment. Impedance matching of the coating filler can be effectively optimized, and excellent electromagnetic wave absorption performance is achieved through the synergistic effect of dielectric loss, magnetic loss and multi-interface polarization.

The invention provides an anaerobic fermentation accelerant as well as a preparation method and application thereof, and relates to the field of anaerobic fermentation. The preparation method comprises the following steps: synthesizing a magnetic carbon quantum dot compound; dispersing the magnetic carbon quantum dot compound in an MES buffer solution, carrying out ultrasonic treatment for 30-40 minutes, then adding N-(3-dimethylaminopropyl)-N '-ethylcarbodiimide hydrochloride and N-hydroxysuccinimide, and stirring for 30-40 minutes under the conditions of room temperature and light shielding, so as to obtain an activated turbid liquid; dispersing methoxyl-polyethylene glycol-amine in an MES buffer solution, then dropwise adding the MES buffer solution into the activated turbid liquid, and stirring to react for 12-24 hours; and S6, performing centrifugation, magnetic separation, washing and drying on the product in the step S5 to obtain the accelerant. The accelerant point has magnetism, and the surface of the accelerant point is grafted with a hydrophilic polymer, so that a hydration layer is formed, steric hindrance is formed, macromolecules are prevented from approaching and being adsorbed on the surface of the carbon quantum dot, and the activity of the carbon quantum dot is prolonged.

The invention belongs to the technical field of environmental functional materials and sewage treatment, and discloses a polydopamine modified enzyme-loaded magnetic sludge carbon carrier material and application thereof in enhancing a sewage / wastewater biological treatment process. A porous magnetic carbon matrix is prepared by pyrolyzing waste biomass and iron-containing sludge, enzyme molecules are dynamically cross-linked and loaded after modification of a polydopamine coating, and PAM is coated to enhance stability. The obtained material has the characteristics of high specific surface area, uniform pore size distribution and strong magnetic saturation intensity, can efficiently adsorb and degrade organic pollutants and antibiotic substances in wastewater, can be recycled through magnetic separation, has high enzyme activity retention rate, does not need complex equipment, is simple and convenient to operate, has the characteristics of greenness, low carbon, excellent degradation performance and the like, and is suitable for industrial production. The method is suitable for advanced treatment of industrial wastewater in medicine, printing and dyeing, chemical industry and the like.

The invention provides a preparation method of a bamboo magnetic carbon-based composite wave-absorbing material, and belongs to the field of material chemistry. The bamboo magnetic carbon-based composite wave-absorbing material provided by the invention is prepared by loading Fe < 3 + >, Co < 2 + > and Ni < 2 + > on a bamboo base material through a simple and efficient method and then carrying out a high-temperature cracking reaction. By means of the excellent channel structure of the bamboo material, metal cations can be well loaded on the surface of the bamboo base material, the magnetic loss capacity of the material is enhanced, impedance matching is improved, and therefore on the basis of the biomass bamboo material, the effective absorption bandwidth (RL <-10 dB) can reach 4.12 GHz, and the strongest absorption can reach 41.79 dB.

The invention discloses a polyisocyanate composition and a coating composition, and the polyisocyanate composition is derived from an aliphatic / alicyclic diisocyanate monomer and contains an isocyanurate structure. The mass fraction of a polyisocyanate having a number average molecular weight of 200-500 (inclusive) with respect to the polyisocyanate composition in a spectrum of the polyisocyanate composition obtained by gel permeation chromatography (GPC) is A, and the allophanate structure is contained in a spectrum of the polyisocyanate composition obtained by nuclear magnetic carbon spectroscopy (13C-NMR), and the content of the allophanate structure in the spectrum of the polyisocyanate composition obtained by nuclear magnetic carbon spectroscopy (13C-NMR) is less than 1%. The molar ratio of the allophanate structure to the isocyanurate structure is B, and the relation between A and B meets the condition that A / B is larger than or equal to 0.1 and smaller than or equal to 10. The composition not only has low viscosity, but also has good cross-linking property, and can ensure good application performance of a coating film.

The invention discloses a multifunctional magnetic carbon quantum dot sensor, a preparation method and application, and aims to solve the technical problems of detection and synchronous separation and recovery of Al < 3 + > in a water body. The sensor is formed by carrying out electrostatic self-assembly loading on aminated ZnFe2O4 (at) SiO2 nanoparticles and carbon quantum dots with carboxyl and hydroxyl on the surfaces, and has a core-shell structure and superparamagnetism. The preparation process comprises three steps of carbon quantum dot hydrothermal synthesis, ZnFe2O4 coated SiO2 nanoparticle coating and amino modification, and electrostatic self-assembly compounding, and the process is simple and easy to control. The sensor has specific recognition capability on Al, is excellent in anti-interference performance, can realize rapid magnetic separation by virtue of self magnetism, does not need centrifugation or filtration assistance, can be recycled after elution, and can avoid secondary pollution. Detection and adsorption separation of Al < 3 + > are synchronously achieved, the green chemistry concept is met, and the method has important application value in the fields of wastewater treatment and aluminum resource recovery.

The application discloses a wastewater biological enhanced denitrification and dephosphorization process based on a magnetic carbon biofilm carrier, which comprises the following steps: firstly, adding the powdered magnetic carbon biofilm carrier into activated sludge to perform aeration stirring and mixing, and then performing pre-membrane hanging to form magnetic sludge flocs; and then continuously adding the magnetic sludge flocs into an aerobic tank to perform sludge-membrane mixing operation; and the preparation method of the powdered magnetic carbon biofilm carrier comprises the following steps: (1) drying and crushing one or more than two of straw, wood powder and municipal sludge to obtain biomass powder; (2) mixing and impregnating the biomass powder with a salt solution containing iron elements, and then uniformly mixing ferromagnetic powder to obtain a mixture; (3) drying and crushing the mixture, and then placing the mixture into a sealed container to perform anoxic pyrolysis carbonization; and after the carbonization product is cooled, the carbonization product is ground by a ball mill to obtain the powdered magnetic carbon biofilm carrier.

The application discloses a preparation method of a carbon-phosphorus specific flocculation adsorption magnetic carbon-based material and application thereof, and belongs to the field of sewage treatment materials. A certain proportion of biochar, iron salt and iron powder are uniformly mixed under certain conditions (pH, stirring speed and stirring time) to obtain a first mixed solution, the first mixed solution is dried, broken, and then placed in a muffle furnace for anaerobic pyrolysis to obtain a magnetic biochar adsorbent. The magnetic biochar adsorbent is acid-modified by using hydrochloric acid with a certain concentration to obtain a second mixed solution. The second mixed solution is dried and cooled, and the product is sieved to obtain the carbon-phosphorus specific flocculation adsorption magnetic carbon-based material. The carbon-phosphorus specific flocculation adsorption magnetic carbon-based material has low cost, integrates the functions of flocculation, adsorption and magnetic response, and is suitable for sewage treatment.

The application provides a composite diaphragm and a preparation method thereof. The composite diaphragm comprises a diaphragm base and magnetic carbon nanotubes arranged on at least one side of the diaphragm base. One end of the magnetic carbon nanotubes is connected to the diaphragm base, and the other end extends away from the diaphragm base. The magnetic carbon nanotubes comprise first magnetic carbon nanotubes, and the angle between the extending direction of the first magnetic carbon nanotubes and the diaphragm base is 30-90°. The use of the composite diaphragm for assembling a negative electrode-free battery can make lithium metal uniformly deposit on the negative electrode side and improve the cycle performance of the battery.