310 results about "Porous composite" patented technology

The invention relates to a fly ash-based MOFs adsorption-catalysis material integrated preparation method, and belongs to the field of solid waste treatment and resource utilization. The material takes industrial solid waste fly ash as a matrix, and is prepared by the following steps: firstly, carrying out alkali modification and silane coupling agent surface activation treatment on fly ash to form a high-activity matrix; then loading a metal organic framework (MOFs) on the surface of the activated fly ash through an in-situ synthesis process to form a porous composite carrier; the integrated material with CO2 adsorption and catalytic conversion functions is further prepared through impregnation of a copper-based active component and a high-temperature calcination process. According to the invention, the problems of high energy consumption, high cost and low comprehensive utilization rate of fly ash of the traditional CO2 capture and utilization technology (ICCU) are solved, high-valued resource utilization of industrial solid waste and efficient capture and conversion of CO2 are synchronously realized, and the method has dual values of environmental protection and economy.

The invention relates to the technical field of sound absorption composite materials, in particular to a porous composite material capable of enhancing sound absorption performance and a preparation method and application of the porous composite material capable of enhancing the sound absorption performance. And high-efficiency sound absorption can be realized in the full frequency band of 100Hz-6000Hz. Especially in the low-frequency band of 200Hz-1000Hz, the sound absorption coefficient is increased by 20%-50% compared with that of a traditional porous material with similar thickness and weight, and the problem that the traditional material is insufficient in low-frequency sound absorption is solved.

The invention provides a porous composite current collector and a preparation method thereof, the porous composite current collector comprises a base film layer and a conductive layer arranged on the surface of the base film layer, the conductive layer comprises a conductive material, the base film layer comprises a high-molecular polymer, the base film layer is provided with a plurality of through holes, and the through holes are communicated with the conductive material. And a blocking part for preventing magnetron sputtering pollution is arranged in the through hole. By effectively optimizing the composition and the preparation process of the porous composite current collector, the sheet resistance of the porous composite current collector is reduced, and the situation that a conductive material is hit onto a sputtering back roller through vertical holes to cause back roller pollution is avoided, so that the porous composite current collector has high conductivity and high compression strength, and the binding force of a conductive layer and a base film layer is improved.

The present invention relates to a porous composite structure catalyst comprising a porous substrate and a catalyst coating layer, wherein the catalyst coating layer comprises: a porous support including meso-pores; and a composite catalyst, which is gold nanoparticles impregnated into pores of the porous support.

The corundum-silicon carbide-mullite castable is prepared from sintered mullite particles, silicon carbide fine powder, activated aluminum oxide micro powder, silicon dioxide micro powder, composite rare earth oxide fine powder, aluminum titanate fine powder, a binding agent, a water reducing agent, explosion-proof fibers and porous composite corundum-silicon carbide particles. The porous composite corundum-silicon carbide particles are formed by sintering fused corundum particles and nano silicon carbide powder through in-situ reaction, micron-sized pore channels which are communicated with one another are formed in the porous composite corundum-silicon carbide particles, and the surfaces of the particles are coated with a compact mullite-corundum complex phase layer, so that thermal stress can be effectively buffered, and permeation of zinc and alkali vapor can be blocked; the low thermal expansion characteristic of aluminum titanate and the grain boundary purification effect of rare earth oxide are matched, thermal shock resistance and erosion resistance are synergistically improved, and excellent thermal shock resistance, chemical erosion resistance, high strength and wear resistance are shown under the harsh working condition of the zinc oxide rotary kiln.

The invention relates to the technical field of drying agents, in particular to a porous composite gel drying agent and a preparation method thereof. Conventional desiccants are difficult to give consideration to both stable chemical properties and high moisture absorption capacity. In order to solve the problems, the porous composite gel drying agent is provided, lithium chloride, calcium chloride and other hygroscopic salts are introduced to serve as additives in a porous polymerization network of the drying agent and are compounded with the polymer network, and the intrinsic moisture absorption capacity of the material is remarkably improved. The moisture absorption capacity of the obtained porous composite gel drying agent is far higher than that of traditional silica gel, the long-acting moisture absorption requirement in the high-humidity environment can be met, and the porous composite gel drying agent is particularly suitable for the high-end fields of precision electronics, new energy batteries, biological agents and the like with strict requirements for humidity control precision.

The invention belongs to the field of silicon-carbon negative electrode materials, and particularly relates to a preparation method of a silicon-carbon negative electrode material and a silicon-carbon negative electrode semi-solid-state battery. The preparation method of the silicon-carbon negative electrode material comprises the following steps: grinding and mixing nano silicon and asphalt, and carbonizing to obtain amorphous carbon layer coated silicon particles; performing chemical vapor deposition of a carbon layer on the amorphous carbon layer coated silicon particles, and etching by using a ferric chloride solution to form porous composite carbon layer coated silicon particles; and annealing the porous composite carbon layer coated silicon particles in a nitrogen-containing atmosphere to form the nitrogen-doped silicon carbon negative electrode material. The nitrogen-doped porous composite carbon layer silicon-carbon negative electrode material is prepared through the links of amorphous carbon coating of silicon particles, chemical vapor deposition of a carbon layer, etching of a porous structure, nitrogen doping and the like, volume expansion of silicon can be effectively inhibited, and the cycling stability is improved. In addition, the capacity of the silicon-carbon negative electrode can be improved to 1500-1800 mAh / g, and great benefits are also brought to improvement of the energy density of the battery.

The invention provides a lithium ion battery diaphragm containing vermiculite nanosheets, a preparation method of the lithium ion battery diaphragm and a lithium ion battery, and the preparation method comprises the following steps: (1) uniformly mixing polyvinylidene fluoride and the vermiculite nanosheets in an organic solvent to obtain a mixed liquid; (2) coating the mixed liquid on a substrate; (3) immersing the coated substrate in a water bath for non-solvent induced phase separation to form a porous composite membrane; and (4) stripping the porous composite membrane from the substrate, and removing the residual solvent in the porous composite membrane to obtain the lithium ion battery diaphragm containing the vermiculite nanosheets. According to the preparation method disclosed by the invention, vermiculite nanosheets (VNs) are introduced into a PVDF matrix through a non-solvent induced phase separation (NIPS) technology, so that the PVDF diaphragm with high porosity, high electrolyte absorptivity and excellent thermal stability and mechanical property is prepared.

The invention discloses a porous GNP / PDMS composite material, a preparation method thereof and application of the porous GNP / PDMS composite material in a flexible sensor, and belongs to the technical field of flexible sensors and preparation of the flexible sensors. According to the preparation method, expanded polystyrene microspheres are taken as sacrificial templates to be combined with glucose, a spherical pore structure is constructed through a vacuum infiltration method, graphene is dispersed in a PDMS matrix by adopting a multi-step ultrasonic dispersion technology, and porous GNP / PDMS composite materials with different graphene contents are obtained. On the basis, a conductive electrode and a flexible packaging layer are combined to construct a high-sensitivity flexible sensor. Results show that the GNP / PDMS composite material containing 4 wt.% of graphene shows excellent mechanical properties, the elastic modulus is 2.43 MPa, the maximum tensile strength is 1.46 MPa, meanwhile, the recovery of more than 99.6% is maintained after 200 times of compression cycles, and the composite material shows very strong mechanical stability.

The present invention relates to a composite material, wherein the composite material comprises porous carbon and cerium nitrohalide within the porous carbon. In addition, the present invention relates to a method for preparing the composite material, comprising: enabling a haloalkylated resin to react with a nitrogen-containing organic compound to obtain a nitrogen-modified halogen-containing resin; optionally, washing the nitrogen-modified halogen-containing resin by means of a halide salt solution; and mixing the nitrogen-modified halogen-containing resin with a cerium precursor, and then calcining the mixture in an inert gas atmosphere to obtain the composite material. When such a cerium-carbon porous composite material is used as a catalyst in a transesterification reaction, the conversion rate of the reaction can be significantly improved.

The invention discloses an anaerobic denitrifying bacterial agent as well as a preparation method and application thereof, and belongs to the technical field of water environment treatment. The anaerobic denitrifying bacterium agent is prepared from the following components in parts by weight: 15 to 30 parts of sterile water, 15 to 60 parts of normal saline, 5 to 10 parts of micro-capsule embedded anaerobic denitrifying bacteria, 5 to 20 parts of a porous composite modified carrier, 10 to 30 parts of a carbon source, 4 to 7 parts of nutrient elements, 2.5 to 4 parts of a buffering agent and 1 to 5 parts of a stabilizer, the micro-capsule embedded anaerobic denitrifying bacteria are obtained by embedding anaerobic denitrifying bacteria with an alginic acid gel solution and a calcium chloride solution; the porous composite modified carrier is obtained by crosslinking modified nano iron oxide, modified nano titanium dioxide, a functional polymer solution and glutaraldehyde. The anaerobic denitrifying bacterial agent provided by the invention can effectively improve the efficiency of treating nitrogen pollution of a water body.

The invention discloses an in-situ synthesized naphtha catalytic cracking agent material and a preparation method thereof, and belongs to the field of petrochemical engineering catalytic materials. According to the method, the porous LaF3 composite material is synthesized in situ on the surface of ZSM-5 through a process route of PVP soft template in-situ attachment, hydroxyl modification, LaF3 in-situ deposition and hydrothermal synergistic crystallization. According to the material, through a weak acid-medium strong acid synergistic acidic system and a porous structure, the problems that a traditional catalyst is insufficient in acid sites, mass transfer is blocked and carbon deposition is serious are solved, the initial conversion rate of naphtha is larger than 90%, the total yield of ethylene and propylene is larger than 52%, the carbon deposition amount is only 9.4% after circulation is conducted five times, the structure is stable, the preparation process is simple, and the material has industrial application potential.

The invention provides a controllable-release scale inhibitor with a mineralization function and a preparation method thereof, and belongs to the technical field of water treatment materials, and the preparation method comprises the following steps: dissolving carboxymethylated sodium polyaspartate in water, adding a SrCl2 aqueous solution for reaction, then adding a ZnSO4 aqueous solution for continuous reaction, and performing centrifugal separation to obtain FOF-Zn / Sr; the preparation method comprises the following steps: dissolving chitosan in an acetic acid solution, adding zinc citrate and a cross-linking agent, and reacting to obtain a chitosan-zinc citrate gel solution; dissolving N-isopropylacrylamide and N, N-methylene bisacrylamide in water, pre-polymerizing, adding into the chitosan-zinc citrate gel solution, and stirring to react, so as to obtain porous composite gel; and adding FOF-Zn / Sr and a dispersing agent into water, adding the porous composite gel, stirring at low temperature, washing, and granulating to obtain the scale inhibitor. The scale inhibitor obtained by the invention can realize controllable release of scale inhibition substances, and also can mineralize a water body and slowly release beneficial mineral elements.

The application discloses a copper-zinc bimetallic organic metal framework compound and a synthesis method and application thereof, and is based on a hydrothermal solvent method and a strong alkali compound surface layer activation process to prepare a novel porous composite material, and the specific steps comprise zinc-based "core" layer MOF material synthesis, surface strengthening activation of the core layer material by using a strong alkali, copper-based loading, in-situ growth of a "shell" layer MOF, and application of the material to CO2 adsorption and capture; the optimal sample has a CO2 adsorption capacity of up to 151.8 cm 3 / g under normal temperature and pressure, a CO2 gas adsorption capacity of up to 271.2 cm 3 / g in a high pressure section, a separation coefficient of the material for 400 ppm CO2 / N2 is up to 26.34, a separation coefficient of the material for 40 / 60 v / v CO2 / H2 is up to 141.07, and after an adsorption-desorption cycle test, the adsorption capacity performance is still retained to be not less than 95%, compared with a traditional single-metal MOF material, the method can significantly improve the adsorption separation performance and stability of the material.

The invention belongs to the technical field of catalysts, and particularly relates to a bimetal MIL-53-derived porous composite metal oxide material and a preparation method thereof, a propane dehydrogenation catalyst prepared from the bimetal MIL-53-derived porous composite metal oxide material and application of the propane dehydrogenation catalyst. Comprising the following steps: carrying out hydrothermal reaction on aluminum salt, gallium salt and 1, 4-terephthalic acid; carrying out solvent heat treatment on the hydrothermal reaction product, and washing to obtain a bimetallic MIL-53 precursor; the preparation method comprises the following steps: preparing a bimetallic MIL-53 precursor, sequentially calcining the bimetallic MIL-53 precursor in an inert atmosphere and an oxidizing atmosphere to obtain a porous composite metal oxide material, introducing H2 in a nitrogen atmosphere for reduction, and calcining the porous composite metal oxide material in air to obtain the composite metal oxide catalyst. Gallium oxide clusters can be prevented from being formed, it is guaranteed that gallium oxide is evenly dispersed in the material, and meanwhile generation of an active species GaIV is promoted.

The invention belongs to the technical field of electromagnetic shielding materials, and relates to an electromagnetic shielding and thermal management combined porous composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: impregnating a porous structure skeleton with a two-dimensional electromagnetic shielding material dispersion liquid by using an impregnation method, carrying out vacuum drying, impregnating with a PEG solution, and carrying out vacuum drying to obtain a target porous composite material; meanwhile, through testing, the electromagnetic shielding effectiveness of the porous composite material is larger than or equal to 21.8 dB, the open porous structure can effectively improve the impedance matching characteristic between the porous composite material and air, electromagnetic waves can rapidly enter the material, and multiple times of reflection and scattering occur through a complex network structure so as to dissipate and attenuate electromagnetic wave energy and reduce reflection; and due to the phase change characteristic of PEG, the composite material is endowed with excellent heat management performance and shows excellent heat insulation performance on continuous heat radiation of a 100 DEG C constant heat source, and the surface temperature change of a sample within 300s is less than or equal to 5.1 DEG C, so that the application requirements of electromagnetic shielding and heat management are met.

A porous composite cathode active material for lithium- of sodium-sulfur batteries is provided. The porous composite cathode active material includes an interconnected framework of metal sulfide particles in a conductive binder. The porous composite cathode active material contains between 50 and 75 mass % of an electroactive chalcogen conversion cathode material and between 10 and 35 mass % metal sulfide(s). Methods of making the material can include forming a slurry and drying under controlled conditions.

An electrode material is provided that provides an electrode for a fuel cell with excellent electrode performance and durability. The electrode material is any one of the following electrode materials (A) or (B): Electrode material (A): comprising a porous composite support and electrode catalyst particles supported on the porous composite support, the porous composite support comprising: a carbon support composed of mesoporous carbon; and an electronically conductive oxide fixed to at least the inner surface and outer surface of the micropores of the mesoporous carbon, wherein a portion or all of the electrode catalyst particles are supported within the micropores of the mesoporous carbon via the electronically conductive oxide. Electrode material (B): comprising a carbon support composed of mesoporous carbon; and an electrode catalyst composite fixed to at least the inner surface and outer surface of the micropores of the mesoporous carbon, wherein the electrode catalyst composite comprises electrode catalyst particles and an electronically conductive oxide, the electronically conductive oxide being present in a manner that fills the spaces between the electrode catalyst particles.

The invention relates to the technical field of adsorption materials, in particular to a preparation method and application of a zirconium-based metal organic framework composite sodium alginate material, zirconium ions serve as a metal core, two ligands including pyromellitic acid and 2, 5-dihydroxy terephthalic acid are added, double-ligand MOFsUiO-66-(OH) 2 / (COOH) 2 is synthesized, then the double-ligand MOFsUiO-66-(OH) 2 / (COOH) 2 is compounded with sodium alginate (SA), and the zirconium-based metal organic framework composite sodium alginate material is obtained. The porous composite material SA (at) UiO-66-(OH) 2 / (COOH) 2 is obtained. The UiO-66-(OH) 2 / (COOH) 2 and SA are rich in-OH and-COOH, so that the chelating ability of the UiO-66-(OH) 2 / (COOH) 2 and SA on heavy metals is further enhanced, and the adsorption effect of the composite material on Pb < 2 + > is enhanced. The low-price composite material provides reference and thought for adsorption of metal ions in an actual water sample on site.

The application relates to the technical field of building, and discloses indoor sound insulation and antibacterial coating, which is applied to the surface of a building wall base layer and comprises, from inside to outside, a high-permeability alkali-resistant sealing primer layer, a porous composite sound-absorbing middle layer for gap friction attenuation of sound waves, an antibacterial agent slow-release depot layer for providing long-acting antibacterial active substances, and a photocatalytic sterilization and purification layer. The composite coating system of the application resolves the technical problems of easy agglomeration of sound-absorbing fillers and nanometer antibacterial agents in direct blending in traditional processes and mutual hindering of the effects by scientifically constructing a multi-dimensional functional layered system. The system not only realizes excellent broadband sound insulation and noise reduction effects by virtue of the composite acoustic structure of quality reflection, porous dissipation and damping heat conversion, but also combines the double-effect biochemical mechanisms of deep ion slow release and surface photocatalysis to ensure long-acting broad-spectrum sterilization and decomposition of volatile organic compounds.

The invention belongs to the technical field of wave-absorbing materials, and particularly relates to an InNi3C0.5 / Ni-coated C composite wave-absorbing material and a preparation method thereof. The preparation method comprises the following steps: preparing a Ni-MOFs precursor by taking nickel nitrate and terephthalic acid as raw materials and adopting a solvothermal method, doping indium nitrate with different concentrations into the precursor through an ion exchange strategy to prepare an In / Ni-MOFs composite material, and carrying out high-temperature carbonization treatment on the In / Ni-MOFs composite material to finally obtain the spherical porous composite material. The spherical structure of the composite material provided by the invention can provide an axial carrier channel, promote jumping and migration of electrons, form an effective conductive network and enhance the wave absorbing performance. The problems of poor impedance matching, high density and high filling rate of the traditional carbide are solved, the preparation process is simple, the raw material cost is low, and the prepared wave-absorbing material has the characteristics of strong absorption, wide band and low thickness.

The invention relates to the technical field of energy storage, in particular to a sulfur-doped interconnected hollow porous composite carbon nano-microsphere, a preparation method and application of the sulfur-doped interconnected hollow porous composite carbon nano-microsphere. According to the invention, resorcinol-formaldehyde resin and coal pitch are used as carbon sources, and sublimed sulfur is used as a sulfur source; the preparation method comprises the following steps: uniformly mixing resorcinol-formaldehyde resin, coal pitch and sublimed sulfur, putting the mixture into a carbonization furnace, and heating in an argon atmosphere to prepare the sulfur-doped interconnected hollow porous composite carbon nano-microspheres. The specific surface area of the hollow porous composite carbon nanospheres is 230-390 m < 2 > / g; the total pore volume is between 0.16 cm < 3 > / g and 0.38 cm < 3 > / g; as a negative electrode material of a potassium ion battery, in a 1.0 M potassium bis (fluorosulfonyl) imide (KFSI) electrolyte, when the current density is 0.1 C, the specific capacity reaches 394.6 mAh / g; and when the current density is 5C, the capacity is kept at 200.6 mAh / g after circulation is carried out for 1 to 500 times. When the current density is increased to 20C, the specific capacity can reach 140.4 mAh / g, and high capacity and good rate capability are shown.

The invention discloses a composite porous electrode material as well as a preparation method and application thereof. The composite porous electrode material takes a cellulose nanofiber porous composite material as a carrier and is loaded with a metal oxide active component; the metal oxide is one or more modified structures constructed by heteroatom doping and oxygen vacancy defects. The efficient photoelectric cathode integrating CO2 adsorption and catalytic conversion is constructed, and the effect of remarkably improving CO2 reduction activity and product selectivity is achieved.

A porous composite ultrafiltration membrane including a block copolymer layer having (a) one or more soft block polymer(s) having an elongation at break of greater than about 50%, as measured by ASTM D638 and an elastic modulus of between 10 MPa to 3 GPa as measured by the ASTM D638 tensile test; and (b) one or more hard block polymer(s) having an elongation at break of less than about 65%, as measured by ASTM D638, and an elastic modulus of higher than 1 GPa as measured by the ASTM D638 tensile test, and a macroporous support layer having a pore size larger than a pore size of the block copolymer layer. Also described is a method for making the porous composite membrane.

The invention discloses a preparation method and application of a functional degradable soybean oil-based bionic porous composite bone scaffold. The method comprises the following steps: taking epoxidized soybean oil acrylate as a bio-based base material, compounding isobornyl methacrylate to improve the defects of high viscosity and low photosensitivity of the bio-based base material, adding a photoinitiator containing ethyl 2, 4, 6-trimethylbenzoyl phenyl phosphonate and phenyl bis (2, 4, 6-trimethylbenzoyl) phosphine oxide, compounding, and carrying out aging treatment to obtain base resin; mixing calcium lignosulphonate into the base resin to prepare composite photosensitive resin, and printing a triple-period extremely-small curved surface structure through a digital light processing technology and a 3D printing technology to finally obtain the functional degradable soybean oil-based bionic porous scaffold. The scaffold has calcium lignosulphonate-mediated controllable photo-thermal response behaviors of near-infrared light illumination regulation and bone scaffold component dependence under the condition of simulating the in-vivo environment of a human body, so that a controllable photo-thermal response-mediated remote shape memory function is realized, and meanwhile, a mild, safe and controllable photo-thermal curative effect can also be realized. Besides, calcium lignosulphonate promotes degradation of the composite scaffold by preferentially dissolving and generating a microporous structure on the surface of a matrix while improving the hydrophilic performance of the scaffold, and continuously releases calcium ions, so that the scaffold shows enhanced biomineralization ability and promotes cell proliferation and osteogenic differentiation. The research provides a solution with potential for the soybean oil-based biological photosensitive material in the digital light processing preparation technology and the multi-functional application of the bionic porous bone scaffold so as to deal with complex and irregular bone defects.

The invention discloses a preparation method of a three-dimensional porous EP / MWCNT shape memory composite material, and relates to the technical field of composite material preparation, and the preparation method comprises the following specific steps: adding a multi-walled carbon nanotube into N, N-dimethylformamide according to a ratio of 2wt%, and carrying out ultrasonic dispersion to obtain a dispersion liquid; adding epoxy resin, heating and stirring to obtain a mixed system; sequentially adding isocyano ethyl methacrylate and polyethylene glycol diacrylate, and carrying out cross-linking reaction to obtain a precursor solution; defoaming, injecting into a mold, freezing and forming; and finally, freeze-drying to remove the solvent to prepare the three-dimensional porous EP / MWCNT shape memory composite material. According to the preparation method, each link of preparation is finely regulated and controlled, the multi-walled carbon nanotubes are modified and dispersed by pulse ultrasonic, gradient stirring and the like are combined to form a stable mixed system, and the three-dimensional porous composite material is prepared through step-by-step crosslinking, gradient freezing and segmented freeze-drying forming, has excellent shape memory performance and electrical and thermal conductivity, is uniform in pores and controllable in operation, and is suitable for large-scale production. The large-scale production is facilitated.

The embodiment of the application provides a kind of composite positive material and its preparation method, lithium-sulfur battery positive sheet and lithium-sulfur battery.The composite positive material includes porous carbon matrix, metal atom and carbon nanotube, carbon nanotube is in situ grown on the metal atom attached to the pore and surface of porous carbon matrix, and N element is introduced in the growth process of carbon nanotube.The application is in situ grown by carbon nanotube on porous carbon skeleton and then adjusts the pore structure of porous composite material, effectively inhibits the shuttle effect of polysulfide.At the same time, nitrogen doping helps to increase the chemical adsorption capacity of polysulfide, and also effectively inhibits the shuttle effect of polysulfide, thereby improving the utilization rate of sulfur and the cycle life of battery.The preparation method of nanotube composite material for inhibiting the shuttle effect of lithium polysulfide in the prior art is complex and has high cost.

The present application relates to the technical field of battery, and particularly relates to a high-entropy lithium alloy material, a preparation method, a negative electrode material and a battery. The preparation method provided by the present application grinds metal raw materials of lithium, aluminum, magnesium, tin and zinc into mixed powder; provides a lithium compensation agent, heats the mixed powder to a melting temperature under a protective gas atmosphere, and then adds the lithium compensation agent to form a melt, cools the melt based on a rapid quenching process to obtain a porous composite structure thin strip; places the cooled porous composite structure thin strip in an oxygen-containing gas atmosphere, and the zinc atoms, magnesium atoms and aluminum atoms on the surface of the porous composite structure thin strip respectively react with oxygen and form a passivation layer on the surface of the porous composite structure thin strip; performs fluorination treatment on the side of the passivation layer away from the porous composite structure thin strip to form a protective layer; and performs annealing treatment on the porous composite structure thin strip after the fluorination treatment to obtain a high-entropy lithium alloy material. The problem of insufficient volume expansion inhibition of the high-entropy lithium alloy structure as a negative electrode material is solved.

The invention discloses a preparation method and application of a FeCoZn (at) CP graded porous composite material with excellent electromagnetic wave absorption performance. The preparation method of the composite material comprises the following steps: dissolving nitrates of iron, cobalt and zinc and collagen peptide (CP) in water to form a solution B, dissolving H3BTC in a mixed solvent of ethanol and water to form a solution A, pouring the solution B into the solution A, stirring to form FeCoZn / CP hydrogel, freeze-drying to obtain a sample, and calcining in a hydrogen-containing argon atmosphere to obtain a target product. The FeCo alloy is generated in situ on the surface of the carbon-based material by regulating and controlling the proportion of metal ions and the calcining condition, a graded porous structure and a continuous conductive network are formed through sublimation of zinc at a high temperature, synergistic enhancement of dielectric loss and magnetic loss is achieved, and excellent electromagnetic wave absorption performance is shown.