62 results about "Carbon skeleton" patented technology

The invention provides a boron-nitrogen heterocyclic compound as well as an intermediate and a preparation method thereof, the boron-nitrogen heterocyclic compound has a structure as shown in a general formula (1), and is prepared by taking compounds as shown in a formula A, a formula B and a formula C as intermediates. Compared with similar carbon skeleton molecules, the boron-nitrogen heterocyclic compound provided by the invention shows an excellent narrow-band luminescence property. The half-peak width of the emission spectrum of the boron-aza compound is as low as 6.4 nm, and meanwhile, the fluorescence quantum yield is as high as 97%.

The invention discloses a hydrophobic carbon-based monatomic catalyst and a preparation method thereof. The hydrophobic carbon-based monatomic catalyst comprises a carbon skeleton of a core-shell structure, a metal monatomic active site fixed on the carbon skeleton by forming a coordinate bond with N on the carbon skeleton, and an alkyl chain grafted on the carbon skeleton through a covalent bond. The alkyl chain is grafted through the covalent bond, chemical stable regulation and control of the hydrophobicity of the carbon-based nickel monatomic catalyst are achieved, covalent bond modification avoids the defects of a physical method, long-term stability of hydrophobicity is ensured, and efficient hydrophobic modification is achieved on the premise that monatomic sites are not damaged; a stable three-phase interface is formed on the hydrophobic surface, physical enrichment of CO2 near the catalyst is promoted, mass transfer resistance is reduced, CO2 diffusion is further accelerated through the hollow structure of the carbon skeleton, and the mass transfer capacity is improved.

The invention discloses porous graphite and a preparation method thereof, an electrode and a battery, and relates to the technical field of new energy. The preparation method of the porous graphite comprises the following steps: providing liquid resin and a liquid aromatic polymer, mixing, and sequentially carrying out heat treatment, carbonization treatment, graphitization treatment and activation treatment to obtain the porous graphite. According to the preparation method of the porous graphite provided by the embodiment of the invention, the porous graphite is prepared by taking the liquid resin and the liquid aromatic polymer as raw materials, multiple reactions of curing and aging of the resin and combination of the resin and the aromatic polymer occur in the heat treatment process, and the porous graphite is prepared in the carbonization process. Aromatic polymer molecules are rearranged into an ordered carbon layer, and resin cross-linked molecules form a hard carbon skeleton; in the graphitization process, the ordered carbon layer forms a graphite-like carbon layer, and the order degree of the hard carbon skeleton is not changed; in the activation process, the graphite-like carbon layer is difficult to etch, the hard carbon skeleton participates in the reaction to form a pore structure, and finally the porous graphite is prepared.

The invention relates to an aperture-adjustable porous carbon material and a preparation method and application thereof. The preparation method comprises the following steps: adding an alkali solution into a phenol source, stirring, heating to 60-90 DEG C, adding an aldehyde source solution, stirring, cooling to room temperature, and adding an acid solution to adjust the mixed solution to be neutral, so as to obtain a phenolic resin oligomer solution; evaporating water, and adding low-carbon alcohol to prepare a phenolic aldehyde low-carbon alcohol solution; preparing silicon dioxide sol, wherein the particle size of silicon dioxide particles is controlled by adjusting the pH value; the preparation method comprises the following steps: mixing and stirring a phenolic low-carbon alcohol solution and silicon dioxide sol at 35-45 DEG C, washing, filtering and drying to obtain a silicon dioxide-phenolic resin composite carbon source; carrying out carbonization treatment on the silicon dioxide-phenolic resin composite carbon source to obtain a carbonized product with a carbon skeleton and an S O < 2 > template; and carrying out wet etching treatment on the carbonized product, selectively etching the S < O2 > template so as to form holes in positions occupied by S < O2 > particles, and then washing, filtering and drying to obtain the porous carbon material with the adjustable aperture.

The invention relates to the technical field of carbon material preparation, in particular to phenolic resin-based porous carbon and a preparation method thereof. The core of the preparation method of the phenolic resin-based porous carbon is that the mass ratio of phenolic aldehyde to phenolic aldehyde is optimized (1: (1-1.2)) to ensure sufficient crosslinking, and an amine catalyst is selected to reduce metal residues; meanwhile, terephthalaldehyde is introduced as a cross-linking accelerant, so that the bridging density and thermal stability of a resin network are effectively enhanced, and structural collapse is inhibited in subsequent carbonization; a sectional type carbonization process is further adopted, and the carbon skeleton is preserved by controlling the heating rate. According to the method, the carbonization yield is finally and successfully improved to 58% or above (improved by 15%-20% compared with that of a traditional method), the ash content is remarkably reduced (smaller than or equal to 0.2%), and an excellent material with a small mesoporous structure (the average pore diameter ranges from 2 nm to 10 nm) and a high specific surface area (larger than or equal to 1500 m < 2 > / g) is obtained.

The invention discloses a carbon-coated ZnO / CoO composite adsorbent and a preparation method thereof, the method comprises chloromethylation modification, amination modification, ZIFs in-situ growth and preparation of the carbon-coated ZnO / CoO composite adsorbent, and the invention relates to the technical field of adsorption materials. According to the invention, styrene resin microspheres are subjected to chloromethylation to introduce active functional groups, and amination is carried out to generate amino groups (-NH), so that active sites coordinated with metal ions are provided, and in-situ growth of ZIF-8 and ZIF-67 on the surface of resin is promoted. The crystal morphology and distribution are effectively controlled by optimizing the molar ratio of the zinc salt and the cobalt salt to the ligand and selecting the solvent and the nucleating agent. And finally, after the material is subjected to high-temperature calcination, the resin and the ZIFs are subjected to synergistic pyrolysis to form a structure that the nano oxide is uniformly embedded into the porous carbon skeleton, so that the stability, the active site density and the gas diffusion efficiency of the adsorbent are remarkably improved.

The invention relates to the technical field of nano-materials, and discloses a heterogeneous diatomic nano-enzyme as well as a preparation method and application thereof. The invention provides a space confinement regulation and control strategy which is used for constructing a heterodiatomic catalytic center on a nitrogen-doped carbon skeleton and preparing nano-enzyme with structural stability and synergistic catalytic performance. According to the method, a confinement framework formed by self-assembly of first metal ions such as cobalt ions and second metal ions such as zinc ions and organic ligands is used as a template, third metal ions such as iron ions are introduced, and then carbonization heat treatment is performed in a protective gas atmosphere, so that bimetal sites with stable bridging configuration are formed in situ. The obtained nano-enzyme has the catalytic activity of various antioxidant enzymes, including catalase and remarkable superoxide dismutase activity, and has more excellent free radical scavenging capacity compared with a single-metal or non-bridging system.

The invention discloses a surface villus modified composite carbon material preparation method, which comprises: S1, carrying out cleaning, drying and crushing treatment on a carbon source having a multi-dimensional skeleton structure to obtain multi-dimensional skeleton solid powder; s2, mixing the multi-dimensional skeleton solid powder obtained in the step S1 with one-dimensional cellulose nanofibers according to a certain mass ratio to form mixed solid powder, adding deionized water, stirring to form a uniform viscous material, and drying to obtain a fluff composite precursor; and S3, carrying out carbonization treatment on the fluff composite precursor obtained in the step S2 to obtain the surface fluff modified composite carbon material. According to the invention, the carbon composite material with fluff modification on the surface is directionally constructed by utilizing the idea of multidimensional carbon skeleton compounding, and the directional regulation and control of the physical morphology of the traditional carbon material are realized.

The invention relates to a method for constructing a porous carbon molecular structure model with an adjustable pore structure, which comprises the following steps of: (1) calculating the number of required carbon atoms according to the density of the porous carbon molecular structure model, calculating the number of basic structure units in the model, and determining the number and radius of virtual atoms; (2) packaging the basic structure units and the virtual atoms in a three-dimensional periodic boundary with the side length of 5nm by adopting a random filling method, and keeping the positions of the virtual atoms fixed to obtain an initial configuration of the molecular structure model; (3) carrying out structure optimization on the initial configuration, carrying out annealing dynamics simulation, and gradually annealing the system from 6000 K to 300 K to form a balanced system; and (4) removing virtual atoms in the system to obtain a carbon skeleton structure, adding hydrogen atoms on the carbon skeleton structure, and carrying out structure optimization to obtain the porous carbon molecular structure model. According to the method, wide porosity and pore size distribution can be generated, and the purpose of controlling the pore structure is achieved.

The application provides a metal-carbon skeleton nano-microparticle and a preparation method thereof, and belongs to the field of nanometer material preparation, wherein the metal-carbon skeleton nano-microparticle is prepared from raw materials through a solvothermal reaction; the raw materials comprise, in percentage by mass, 3-15% of polymerizable monomers, 0.05-1.5% of initiators, 0.01-1.5% of metal salts and the balance of solvents; the active functional groups of the polymerizable monomers comprise nitrogen and / or oxygen; and the metal salts comprise at least one of aluminum salts, zirconium salts, chromium salts and zinc salts. The application uses metal ions and organic precursors containing active groups as raw materials, realizes controllable adjustment of the particle size of the nano-microparticles in the range of 1-5000 nanometers through metal crosslinking, induced nucleation and in-situ carbonization processes. The preparation process of the application is simple and controllable, the obtained nano-microparticles are uniform in size, stable in structure, high in temperature resistance and salt resistance, and can be widely applied in the fields of catalysis, sensing or oil displacement.

This invention belongs to the field of biomass materials technology, specifically relating to a titanium-doped biochar, its preparation method, and its applications. In this invention, supercritical fluid is used for composite processing. Its unique high diffusion and low surface tension characteristics enable uniform distribution of the titanium source within the protein fibers and induce condensation reactions between hydroxyl groups on the titanium surface and carboxyl groups in the protein fibers within the supercritical system, forming high-density Ti-O-C chemical bonds. Furthermore, low-temperature thermal induction is performed based on the supercritical pre-swollen matrix structure to complete the ordered reconstruction of the carbon skeleton structure and the regulation of active sites, achieving in-situ self-doping of N and S while avoiding the TiO2 phase transformation. This further improves the stability and photocatalytic performance of the titanium-doped biochar, enabling visible light response.

The present application provides a kind of coal tar macromolecular network model construction method based on HRTEM and XPS, belongs to chemical molecular reaction kinetics technical field, including S1: processing coal tar macromolecular sample HRTEM image data;S2: determine the element composition and functional group composition of coal tar macromolecular sample;S3: set the basic unit structure of coal tar macromolecular network model, and calculate the proportion of different unit structure;S4: construct the aromatic layer sheet of carbon skeleton unit in coal tar macromolecular network model;S5: set the bridge bond of carbon skeleton unit, finally obtain the complete carbon skeleton unit in coal tar macromolecular network model;S6: revise the edge of carbon skeleton unit, hydrogenation is added to carbon skeleton unit and the coal tar macromolecular network model is optimized.It can finely construct coal tar macromolecular network, restore the real composition of coal tar molecule to the greatest extent, ensure that subsequent calculation structure is more real, suitable for constructing macromolecular network model for coal tar obtained under different coal rank and different working conditions.

This invention provides a method for preparing graphyne with all rhombic molecular channels, comprising: S1 ultrasonically cleaning a copper foil in a hydrochloric acid solution to obtain a pretreated copper foil substrate; S2 placing the pretreated copper foil substrate in a double-necked flask containing a palladium catalyst, adding a reaction solvent, and refluxing to obtain an activated copper foil substrate; S3 adding a polybrominated benzene and a magnetic particle sequentially to another double-necked flask, placing the activated copper foil substrate in the flask, and then adding a reaction solvent to obtain a reaction system; S4 dissolving the polyyneylbenzene in the reaction solvent to obtain a first mixed solution, adding the first mixed solution to the reaction system for synthesis to obtain graphyne with all rhombic molecular channels. By using trisubstituted and hexasubstituted monomers for cross-coupling reactions, a two-dimensional conjugated carbon framework with all molecular channels being rhombic is precisely constructed, synthesizing a graphyne-like carbon material with all molecular channels being rhombic.

The invention relates to a metal organic carbon skeleton derivative composite material as well as a preparation method and application thereof. The metal organic carbon skeleton derivative composite material comprises a metal organic carbon skeleton and metal particles loaded on the surface of the metal organic carbon skeleton, the metal organic carbon skeleton comprises rare earth elements and an organic ligand; the metal organic carbon skeleton has a rod-like structure. A metal organic carbon skeleton provided by the invention comprises rare earth elements and can provide good wave-absorbing performance, a continuous three-dimensional conductive carbon network formed by mutual connection of rod-shaped structures can provide effective dielectric, and gaps, interfaces and holes formed among the rod-shaped structures can also significantly increase multiple reflection and scattering of electromagnetic waves, so that the wave-absorbing performance is improved. The dielectric size, the polarization mode and the loss mechanism of the material are synergistically promoted, and impedance matching is optimized, so that the wave-absorbing performance of the material is further improved.

The invention discloses a joint replacement full-stage self-adaptive Ag-DLC coating and a preparation method thereof, the coating comprises a bio-friendly substrate, a titanium bonding layer and an Ag-element-doped Ag-DLC functional layer, the Ag element in the functional layer is embedded in a DLC carbon skeleton in the form of Ag nanoparticles, the size of the Ag nanoparticles is 1-35 nm, and the doping amount is 2-40 at.%. According to the invention, the DLC coating with the nanocrystalline / amorphous composite structure characteristic is constructed by doping the Ag element with the anti-bond characteristic, so that the synergism of functions such as mechanical bearing, abrasion resistance, antibacterial property and biocompatibility can be realized. By means of controllable release of the Ag nanoparticles, self-adaptive response of functional characteristics of the metal joint implant in the whole service stage can be achieved, the requirements of the coating on the antibacterial performance and biocompatibility in the early postoperative stage can be met, and reliable anti-abrasion protection and osteogenesis promoting functions can be provided for the stable postoperative service stage.

The application provides a preparation method of carbon-metal composite material based on in-situ limited hot pressing, and belongs to the field of nanometer materials and preparation technology thereof.The preparation method comprises the following steps: firstly, providing a mixed solution containing a carbon source and a mixed solution containing metal salt; then mixing the mixed solution containing the carbon source and the mixed solution containing the metal salt under stirring, so that metal ions in the metal salt are coordinated with the carbon source; standing and separating the precipitate to obtain a precursor, wherein the metal ions in the precursor are dispersed in a coordinated manner and anchored around the carbon source; finally, performing hot pressing carbonization on the precursor, so that the precursor is subjected to limited densification and in-situ carbonization under the synergistic action of a thermal field and a pressure field, so that the carbon source is converted into a carbon skeleton with a three-dimensional pore structure, meanwhile, the metal ions are in-situ reduced and loaded on the carbon skeleton, and the carbon-metal composite material is obtained.The application also provides the carbon-metal composite material obtained based on the preparation method and application thereof.

The application discloses a kind of silicon-carbon negative electrode material and preparation method thereof, belong to negative electrode material technical field.The silicon-carbon negative electrode material includes: N-doped porous carbon, using polyimide-polyurethane-phenolic resin copolymer is obtained by carbonization;Nano silicon particles are loaded in the pore and / or surface of N-doped porous carbon;Amorphous carbon coating is coated on the surface of N-doped porous carbon and / or silicon nanoparticles.The application uses polyimide-polyurethane-phenolic resin by copolymerization strategy, polyimide segment, polyurethane segment and phenolic resin segment are copolymerized into molecular main chain, realize the uniform distribution of rigid segment (phenolic, polyimide) and flexible segment (polyurethane) at molecular level, and the introduction of polyurethane can solve the phase separation problem of phenolic, polyimide in prior art, ensure that the N-doped porous carbon pore obtained after carbonization is uniform, and the mechanical properties of carbon skeleton are consistent.

The invention discloses a recycled plastic-based PC / ABS composite material and a preparation method thereof, and belongs to the technical field of high polymer materials, the recycled plastic-based PC / ABS composite material comprises the following raw materials by weight: 45-55 parts of recycled PC resin, 15-30 parts of ABS resin, 3-5 parts of a flame retardant, 5-8 parts of nano silica, and 0.3-1 part of an antioxidant; in the synthesis process of the flame retardant, an intermediate is firstly prepared, the structure of the intermediate has a carbon skeleton of pentaerythritol and also has a six-membered spiro structure, the intermediate has excellent thermal stability and char forming property, the introduced phosphate structure can endow the intermediate with flame retardant property, and then carbon-carbon double bonds on the intermediate react with phosphorus-hydrogen bonds on DOPO, so that the flame retardant is obtained. The introduced DOPO can be used as the flame retardant, and flame retardant molecules formed by reaction can endow the composite material with excellent thermal stability and flame retardance in a manner of cooperating with the DOPO through an intermediate.

The invention discloses a double-metal carbon skeleton degradation catalytic material, which is characterized in that iron and cobalt in the double-metal carbon skeleton degradation catalytic material are bonded with an oxygen element bond in an ionic state and then bonded with a carbon element, and the structural configuration of the double-metal carbon skeleton degradation catalytic material is Fe / Co-O-C. According to the invention, more iron and cobalt are generated on the periphery of the main carbon skeleton in a dendritic structure in the microscopic aspect, so that not only is greater porosity formed, but also ciprofloxacin and peroxymonosulfate to be degraded can be better absorbed to enter pores and complete reaction; and iron and cobalt at the periphery can be more easily contacted with peroxymonosulfate in the water body at the outer side of the carbon skeleton to realize catalytic action. The material has the advantages of simple preparation method, low cost, convenience in implementation, good pollutant catalytic degradation effect, convenience in recovery, no secondary pollution and the like.

The application provides an iodine-doped starch-based carbon material and a preparation method and application thereof, and relates to the technical field of starch-based carbon materials. The method comprises the following steps: mixing starch, an iodine source and a water-soluble dispersant in a solvent, aging, drying and crushing to obtain a purple red to blue purple inclusion precursor; and then performing gradient carbonization treatment in an inert atmosphere to obtain the iodine-doped starch-based carbon material. The application realizes the inclusion and molecular-level anchoring through the van der Waals force between the spiral cavity of the linear starch and the iodine element, and relies on the water-soluble dispersant to form a physical encapsulation layer on the surface of the starch in situ in the low-temperature carbonization stage, cooperates with the high-temperature carbonization process, and inhibits the volatilization of the iodine element to realize the doping of high iodine content. The obtained material is characterized in that the iodine is embedded in the carbon skeleton in a P-pi conjugate state, the conductivity is significantly enhanced, the carrier concentration is improved, and the sodium ion storage capacity is improved, so that the reversible specific capacity is improved and the first circle coulombic efficiency is improved.

The invention relates to amino acid modified biochar as well as a preparation method and application thereof, natural amino acid is taken as a modifier (arginine or lysine), and integration of amino acid to a carbon skeleton through a covalent bond is completed in one step by adopting a low-temperature hydrothermal reaction (160-200 DEG C); efficient removal of heavy metal ions is realized through ultralow dosage (the solid-to-liquid ratio is (1: 100)-(1: 2000).

The present application relates to a kind of rare earth metal single atom load nitrogen-doped three-dimensional carbon carrier and its preparation method and application.The rare earth metal single atom load nitrogen-doped three-dimensional carbon carrier has the three-dimensional carbon skeleton structure of first carbon nanosheet and second conductive carbon interweave formation, in the three-dimensional carbon skeleton structure, first carbon nanosheet is connected by second conductive carbon between;The three-dimensional carbon skeleton structure is doped with nitrogen element;The rare earth metal single atom is loaded on the nitrogen element and forms stable coordination.

This composite material has a first structure or a second structure including a carbon material, particles containing iron group elements, and compounds containing alkali metal elements (alkali metal and / or alkaline earth metal). In the first structure, a large number of particles containing iron group elements and compounds containing alkali metal elements are dispersed in the carbon skeleton of the carbon material, the particles containing iron group elements contain iron group metal particles having a passivated particle surface, and the compounds containing alkali metal elements are present at least as oxides containing alkali metal elements and / or carbonates containing alkali metal elements. In the second structure, a large number of particles containing iron group elements are dispersed in the carbon skeleton of the carbon material, a large number of compounds containing alkali metal elements are collectively present on the surface of the particles containing iron group elements, the particles containing iron group elements contain iron group metal particles, and the compounds containing alkali metal elements are present at least as oxides containing alkali metal elements.

The invention provides a negative active material and a preparation method thereof, a negative plate, a battery, a battery pack and electric equipment. The negative electrode active material comprises a carbon skeleton and an active material distributed in the carbon skeleton, the chemical formula of the active material is MaXb, b / a is greater than 0 and less than or equal to 3, a is greater than 0, b is greater than 0, M comprises at least one of Fe, Co, Ni, Mn, Sn, Cd and Zn, and X comprises at least one of S, P and O. The negative electrode active material provided by the invention has good energy density and cycle performance.

The invention provides a catalyst for synthesizing vinylene carbonate as well as a preparation method and application of the catalyst. The catalyst is prepared by compounding a nickel-zinc bimetallic nanosheet and a boron-doped carbon material. Compared with traditional nanoparticles, the nickel-zinc bimetallic two-dimensional nanosheet structure designed by the invention has the advantages that more active sites can be exposed, the mass transmission path is shortened, the diffusion of reactants and products is facilitated, and nickel and zinc bimetallic are uniformly dispersed in a boron-doped carbon matrix in a nanoscale, so that the performance of the nickel-zinc bimetallic composite material is improved. By utilizing the synergistic effect between nickel and zinc and the adjusting effect of nonmetal doping on the electronic structure of the carbon material, the catalytic activity can be remarkably improved, Ni and Zn are in atomic-scale close contact, electrons are partially transferred from Zn to Ni, the d electron orbit structure of Ni is finely adjusted, the dissociation adsorption energy of Ni to H2 molecules and the adsorption strength of Ni to reactant molecules are optimized, and the catalytic activity of the carbon material is improved. And boron atoms are doped into a carbon skeleton, so that the electronic property of the carbon material can be changed, and the catalytic reaction is facilitated.

This invention provides a multifunctional amphiphilic carbon dot, a nanofluid, its preparation method, and its application, belonging to the field of oilfield chemistry. The multifunctional amphiphilic carbon dot is obtained by a solvothermal reaction of a carbon skeleton precursor, a heteroatom source, a hydrophobic modifier, and a solvent. The carbon skeleton precursor is a small organic molecule containing carboxyl and / or hydroxyl groups that is easily carbonized. The heteroatom source is selected from organic compounds rich in nitrogen and / or sulfur atoms. The hydrophobic modifier is a surfactant with a long carbon chain of C8-C22. Through ingenious molecular structure design, this invention integrates amphiphilic oil displacement, heteroatom adsorption and corrosion inhibition, and quantum dot fluorescence tracing functions onto a single nanoscale carbon dot particle, constructing a "one-agent-multi-functional" intelligent nanofluid. This achieves efficient, safe, and intelligent synergy in the CO2 oil displacement process under complex reservoir environments.

The invention discloses a three-dimensional porous MXene derived heterojunction material, a composite material and a preparation method. The three-dimensional porous MXene derived heterojunction material has a rich pore structure and a three-dimensional carbon skeleton, has excellent conductivity and stability, is beneficial to sulfur loading, ensures uniform distribution of catalytic sites and inhibits the shuttle effect of polysulfide. According to the method, only a Ti source in MXene needs to be used for constructing a heterojunction, a carbon skeleton left after the MXene is converted into a three-dimensional structure is used as a conductive skeleton, the structural stability is considered, the MXene does not need to be prevented from being oxidized, and therefore the related steps of preventing the oxidation can be omitted. Spray drying is carried out firstly, then high-temperature heat treatment is carried out, and the preparation method is simple, short in period and high in yield. Compared with hydrothermal reaction in the prior art, high temperature and high pressure are not needed, and the safety performance is greatly improved.

This invention discloses a cobalt-based Fischer-Tropsch synthesis catalyst, its preparation method, and its application. The catalyst uses porous carbon framework particles as a support and, based on the total weight of the catalyst, comprises: 70%-85% carbon framework support, 10%-20% cobalt active component, 1%-2% NiO, and 3%-8% CaO. The achieved technical effects are as follows: by employing a porous carbon framework support with high thermal conductivity and high strength, the reaction hotspot temperature can be reduced by more than 50°C, effectively inhibiting cobalt particle sintering and extending the catalyst life by 2-3 times; the continuous, integrally formed carbon framework has a lateral compressive strength >80 N and a wear rate <2%, making it stable for use in fluidized bed reactors; and the introduction of CaO alkaline sites allows for the neutralization of organic acids, reducing the cobalt loss rate from 12% in traditional processes to below 3%, further extending the catalyst life by 30%-50%, significantly improving the catalyst's selectivity, stability, and service life.

The invention discloses a biomass-based porous carbon material as well as a preparation method and application thereof, and belongs to the technical field of preparation of porous carbon materials. The method comprises the following steps: dissolving a phosphorus source and a carbon source in a solvent, and drying to obtain a pyrolysis precursor; and carrying out temperature programming pyrolysis on the precursor in an air atmosphere to obtain the product. According to the method, a phosphorus source and carbon source synergistic carbonization system is constructed, and the dual effects that the phosphorus source forms a compact carbon layer to isolate oxygen at a low-temperature stage and forms a stable POC bond with a carbon skeleton at a high-temperature stage are utilized, so that stable carbonization of the biomass carbon source is successfully realized in an air atmosphere, and the dependence of a traditional process on an inert atmosphere is broken through. The prepared porous carbon material has excellent specific surface area and structural stability, and can be widely applied to the fields of electromagnetic wave absorption, pollutant adsorption, catalytic carriers and the like.

The invention discloses nitrogen-doped hierarchical porous biochar, which is obtained by taking biochar particles as a matrix and loading a nitrogen-containing functional group, and is characterized in that the nitrogen-containing functional group comprises pyridine-N, pyrrole-N and oxidized-N, and is added into a carbon skeleton structure of the biochar in a C-N bond combination manner. The biomass charcoal disclosed by the invention has a rich multi-graded pore structure, and has the advantages of wide adsorption range on antibiotics, high adsorption efficiency and the like.