532 results about "Macropore" patented technology

The invention relates to the technical field of preparation and application of porous carbon materials, in particular to a preparation method and application of a high-performance biomass-based porous carbon material.The preparation method comprises the following steps that biomass raw materials are smashed, dried and sieved to obtain smashed materials, the obtained smashed materials are carbonized to obtain carbonized materials, and the carbonized materials are dried to obtain the high-performance biomass-based porous carbon material. Mixing the obtained carbonized material and a coating material according to a ratio, coating to obtain a precursor, activating the obtained precursor to obtain an activated product, washing and drying to obtain the biomass-based porous carbon material, coating the biomass material, and then activating to prepare the biomass-based porous carbon material capable of controlling the macropore ratio and the specific surface area. The biomass-based porous carbon material provided by the invention has relatively high micropore volume and specific surface area, can provide more active sites for chemical vapor deposition silicon and improve the deposition efficiency, and can be used as a lithium battery negative electrode material.

The invention relates to the technical field of concrete preparation, in particular to high-performance self-compacting concrete and a preparation method thereof, solves the defects in the prior art, and comprises the following components: cement, fly ash, slag powder, graphene oxide, nano-silica aerogel, a water reducer and an air entraining agent. Through silanization modification and magnetic field induction, the problem of interface incompatibility of GO and SA is solved. Graded mass transfer paths are formed between nano layers of GO and mesopores and macropores of SA. And the CaCO3 seed crystal in the SA hole directionally guides the oriented growth of the C-S-H gel, so that the early strength development rate is increased.

The invention discloses an adsorption heat storage material with a multi-stage stepped pore structure and a preparation method of the adsorption heat storage material, according to the material, a metal foam matrix is combined with the multi-stage pore structure, and the storage and release efficiency of heat energy is remarkably improved. Specifically, the metal foam matrix is composed of a plurality of metal foam layers with different porosities, and the porosities are gradually increased in the heat source direction, so that the heat resistance is effectively reduced, and the diffusion of adsorbate is accelerated. The adsorbent coating is coated with an adsorption material mixture containing a template agent, and is subjected to drying and roasting treatment to form a multi-stage pore structure comprising macropores, mesopores and micropores, so that the adsorption diffusion speed and the adsorption capacity are improved. The material not only improves the heat energy storage and energy release capabilities, but also optimizes the diffusion rate of adsorbate. According to the preparation method, through simple and convenient processes such as splicing of the metal foam layer and coating of the adsorbent, the production cost is reduced, the preparation process is efficient and controllable, and wide application prospects are achieved.

The invention relates to a silicon-carbon composite material with a porous structure and a preparation method thereof, and the silicon-carbon composite material with the porous structure comprises an N / P co-doped porous carbon skeleton with micropore, mesopore and macropore channel networks, and amorphous or low-crystalline nanometer silicon particles which are uniformly loaded in the porous carbon skeleton and have the average particle size of 15-40nm, the mass percent of silicon in the composite material is 40-60%, and good interface bonding is formed between silicon and carbon. The preparation method mainly comprises the following steps: firstly, preparing an N / P co-doped porous carbon skeleton through a template method in combination with high-temperature carbonization and N / P source co-pyrolysis; and hydrolyzing an organic silicon source in the carbon skeleton to form silicon dioxide, and performing low-temperature metal thermal in-situ reduction to obtain the nano-silicon loaded composite material. Through a unique porous carbon skeleton design and a precise in-situ composite strategy of nano silicon, the prepared material shows high specific capacity, high initial coulombic efficiency and excellent cycling stability and rate capability when being used as a negative electrode of a lithium ion battery.

The invention discloses a silicon-carbon material and a preparation method and application thereof, belongs to the technical field of negative electrode materials, and overcomes the defect of high volume expansion rate of a silicon-based material in the prior art. The silicon-carbon material provided by the invention comprises porous carbon and silicon deposited in porous carbon channels; the porous carbon comprises mesopores and macropores, the pore diameter of the mesopores is greater than 10nm and less than or equal to 50nm, and the pore diameter of the macropores is greater than 50nm and less than or equal to 100nm; based on the total volume of the pores in the porous carbon, the volume fraction of the mesopores is 50%-75%, and the volume fraction of the macropores is 10%-20%; and the silicon deposited in the mesopores and the macropores is a hollow silicon nanotube. Silicon in the silicon-carbon material mainly exists in the form of hollow silicon nanotubes, and during lithium intercalation expansion, since expansion spaces are reserved in the hollow nanotubes, the lithium intercalation expansion of the whole silicon-carbon material is reduced.

The invention belongs to the technical field of activated carbon preparation, and particularly discloses a preparation device and method for increasing the micropore proportion of activated carbon through segmented activation. A steam activation section and a carbon dioxide activation section are arranged in an activation furnace of the device, and a material channel penetrates through the steam activation section and the carbon dioxide activation section; and a through hole penetrating through the wall thickness is formed in the side wall of the material channel. Materials are subjected to primary activation through the steam activation section, so that more mesopores and macropores are quickly formed in the materials, and then the materials are subjected to secondary activation through the carbon dioxide activation section, so that micropores are further formed in the materials, the number and proportion of the micropores are increased, and the desulfurization performance of activated carbon is improved. According to the technical scheme, the pore structure of the activated carbon is regulated and controlled in a segmented activation mode, the micropore proportion is increased, and therefore the desulfurization performance of the activated carbon is improved, the technological process is simple, meanwhile, waste heat of flue gas obtained after incineration and purification can be recycled, energy is saved, efficiency is high, and industrial application is easy.

The invention relates to an aromatic hydrocarbon isomer adsorbent containing a modified X-type molecular sieve. The outer surface area of the modified X-type molecular sieve is 9.5-19m < 2 > / g, and the sum of the pore volume of mesopores and the pore volume of macropores is 6%-18% of the total pore volume. The p-xylene adsorbent comprises 88-95% by mass of a modified X-type molecular sieve, 4-11% by mass of a crystal transformation X-type molecular sieve and 1-3% by mass of a matrix. The invention also relates to a preparation method of the adsorbent and application of the adsorbent in adsorption separation of p-xylene from mixed C8 aromatic hydrocarbons.

The invention relates to the technical field of preparation of nano catalytic materials, in particular to a preparation method of hierarchical pore channel mesoporous carbon loaded metal nanoparticles. According to the invention, biomass diatomite is used as a template to construct a vertically through macroporous channel, a block copolymer is introduced to form an ordered mesoporous structure, and a pore-foaming agent is added to generate a macro-pore network in a pyrolysis process, so that a macro-pore-mesoporous-micropore three-level communicated carbon-based skeleton is realized; and a bimetallic component is loaded on the hierarchical porous mesoporous carbon in a gradient confinement manner. The material disclosed by the invention has the advantages of fast mass transfer of macropores, stable nanoparticles of mesoporous confinement and efficient catalysis of monatomic sites, and can efficiently catalyze and degrade various wastewater organic pollutants in a wide pH range.

The invention belongs to the field of ceramic products, and particularly relates to a light heat insulation ceramic material and a preparation method thereof. CaCO3 and SiC are adopted as a composite foaming agent, small pores which are uniformly distributed are generated in a two-stage decomposition process, the pore structure is compact, macropore aggregation is avoided, heat conduction is effectively hindered, meanwhile, under the cooperation of the nucleating agent, the coral mucus and the silicon wettability auxiliary agent, the uniformity of the pores is further enhanced, the stability of the whole structure is improved, and the thermal insulation performance is improved. The light heat-insulating ceramic material with both mechanical property and heat-insulating property is obtained.

The invention relates to the technical field of capacitor electrode materials, in particular to a biomass derived porous carbon and layered double hydroxide (LDH) composite material and a preparation method and application thereof. The invention provides a preparation method of a biomass-derived porous carbon and LDH composite material, which is characterized by comprising the following steps: mixing biomass-derived porous carbon, nickel salt, cobalt salt, ethylene glycol, hexamethylenetetramine and water, and carrying out hydrothermal reaction to obtain the biomass-derived porous carbon and LDH composite material, the pore structure of the biomass derived porous carbon comprises micropores, mesopores and macropores. The biomass derived porous carbon and LDH composite material has good specific capacitance, energy density and cycling stability, and can be used as a high-performance supercapacitor electrode material.

The invention provides a porous carbon material, a preparation method thereof and a silicon-carbon negative electrode material containing the porous carbon material. The preparation method of the porous carbon material comprises the following steps: heating and carbonizing an organic carbon source in a protective atmosphere, keeping a certain vacuum degree at least when the temperature reaches the pyrolysis temperature of the organic carbon source in the carbonization process, and then performing or not performing activation to obtain the porous carbon material. The silicon-carbon negative electrode material comprises the porous carbon material and silicon coating and filling the surface and holes of the porous carbon material. According to the preparation method provided by the invention, the content of spherical pores and macropores in the porous carbon material is reduced, the content of columnar pores and cracked pores is increased, the pressure resistance of the porous carbon material and the silicon-carbon negative electrode material is improved, collapse of the silicon-carbon negative electrode material in the process of preparing an electrode by rolling is reduced, and the service life of the silicon-carbon negative electrode material is prolonged. And the silicon-carbon negative electrode material can maintain good electrochemical performance.

The invention relates to the field of porous materials, in particular to a silicon carbide regulated porous silicon carbide film material generated through in-situ reaction and a preparation method and application thereof. According to the porous silicon carbide film material blank, a framework is formed by original silicon carbide particle aggregate, a silicon-containing component and a carbon-containing component are contained in macropore gaps formed among particles, and in the sintering preparation process of the film material, the silicon-containing component and the carbon-containing component are subjected to an in-situ reaction to generate nanoscale or submicron silicon carbide crystal grains to fill the macropore gaps and form small pores. The original silicon carbide particles and / or the nano-scale or submicron-scale silicon carbide crystal grains are connected through sintering to obtain a hole-embedded hole structure. The innovation of the invention lies in that sintering among silicon carbide particles is promoted by adopting the activity of in-situ reaction, the problem that the pore structure cannot be regulated and controlled when macropores among aggregate particles in the transition layer of the silicon carbide film material are simply stacked and filled by small particles is solved, and the permeability of the silicon carbide film material is favorably improved.

The invention discloses a preparation method for forming a hierarchical pore filter material through secondary coating. In order to solve the problems that an existing filtering material is single in pore diameter, and filtering efficiency and pressure drop are difficult to consider at the same time, the hierarchical pore filtering material is formed through the following steps that 1, first-time coating is conducted, specifically, a NaCl template agent and a PTFE solution are mixed according to the ratio of 7: 3, 7%-16% of a solvent is added, a NaCl-coated PTFE foaming solution is prepared, a polyphenylene sulfide needled felt is coated with the NaCl-coated PTFE foaming solution, pre-drying is conducted, and then washing is conducted to form a macroporous structure; 2, secondary coating: coating the macroporous layer with a PTFE foaming liquid containing an AC foaming agent, and carrying out stepped sintering to form micropores, so that efficient interception of particles of 0.5-2.5 microns is realized, and the pressure drop is reduced to 116-251Pa. The multi-stage hole filtering material is suitable for high-temperature flue gas treatment such as waste incineration, has high filtering performance and low running resistance, and has remarkable environmental protection and economic value.

Adsorbent material for use in pressure swing adsorption (PSA) related processing can provide improved purification processing with reduced temperature differentials between adsorption and desorption processing of the bed of adsorbent material. Embodiments can be configured so that adsorbent material has occluded micropores or macropores. The occlusion of the micropores or macropores can be up to 42% of the micropores the adsorbent material in some embodiments. At least one metal acetate can be utilized for the occlusion of the micropores or macropores. Utilization of the adsorbent material having occluded micropores or macropores was surprisingly found to increase the yield for purification of a product gas in spite of the occlusion of the micropores or macropores.

The invention relates to the field of resin synthesis, in particular to functionalized hierarchical pore adsorption chelating resin as well as a preparation method and application thereof. According to the functionalized hierarchical pore adsorption chelating resin, the particle size is 0.65-1.2 mm, the specific surface area is 550-1500 m < 2 > / g, the pore volume is 0.4-1.8 cm < 3 > / g, the proportion of micropores is 15-35%, the proportion of mesopores is 25-40%, and the proportion of macropores is 25-60%. Micropores, mesopores and macropores of the functionalized hierarchical pore adsorption chelating resin are uniformly distributed, the particle size is moderate, the specific surface area and pore volume are relatively large, and the functionalized hierarchical pore adsorption chelating resin has relatively large adsorption capacity on copper ions, nickel ions and lead ions.

The invention discloses a dense sandstone multi-scale pore network modeling method and system, and relates to the technical field of digital rock physics, and the method comprises the steps: constructing a low-resolution three-dimensional digital rock core based on a CT three-dimensional gray image of a rock core sample of dense sandstone; constructing a coarse-scale pore network model based on the low-resolution three-dimensional digital core and a maximum sphere algorithm; respectively carrying out a high-pressure mercury injection experiment and a nuclear magnetic resonance experiment on the rock core sample to obtain throat radius probability distribution and T2 value probability distribution; based on structure parameters and distribution characteristic information of macropores and throats, throat radius probability distribution and T2 value probability distribution, determining multi-scale pore throat size distribution and coordination number distribution of the rock core sample through fitting; and fusing the multi-scale pore throat size distribution and coordination number distribution of the core sample based on a random network algorithm to generate a multi-scale pore network model of the core sample. According to the method, the technical problem that the multi-scale pore space of the real compact sandstone reservoir cannot be represented in the prior art is solved.

The invention belongs to the technical field of solid waste recycling and porous carbon material synthesis, and particularly relates to abandoned wind turbine blade-based porous carbon as well as a preparation method and application thereof. The method comprises the following steps: carbonizing waste wind turbine blade powder in first protective gas, etching, mixing the obtained primary porous carbon material with an activator, and carrying out pyrolysis activation in second protective gas to obtain the waste wind turbine blade-based porous carbon. According to the method, the waste wind turbine blade is converted into the graded porous carbon material with micropores, mesopores and macropores, the diffusion performance of gas in the pore channels is greatly improved through the synergistic effect of the graded porous structure, the performance advantages of high capacity, fast mass transfer and high adaptability are shown, a way is provided for high-value recycling of the waste blade, and the method is suitable for industrial production. And a low-cost material is provided for the fields of energy storage and conversion, environmental governance, catalysis, adsorption and separation and the like, and the material has remarkable economic and environmental benefits and a wide commercial prospect.

The invention particularly relates to a sulfur-loaded carbon microsphere with a hierarchical pore structure as well as a preparation method and application of the sulfur-loaded carbon microsphere. The invention provides a NiX (X = Se, Te) selenium and tellurium porous carbon microsphere sulfur-loaded positive electrode material prepared based on a spray drying technology. According to the material, gamma-cyclodextrin is used as a carbon source, NaCl is used as a template, and three-dimensional porous carbon microspheres with the particle size of 10-20 microns are formed through a spray drying method. Then, the carbonized particles are activated by KOH, and rich micropores are introduced on the basis of an original macroporous structure; and finally, loading sulfur into the porous carbon structure through a melt permeation method to prepare the sulfur composite positive electrode material suitable for the room-temperature sodium-sulfur battery. The three-dimensional porous carbon skeleton of the material can effectively buffer the volume change of sulfur in the sodium ion intercalation / deintercalation process, the electronic conductivity of an electrode is also remarkably improved, and the construction of a room-temperature sodium-sulfur battery positive electrode material with high specific capacity and high stability is facilitated.

The invention discloses a tubular dynamic membrane sulfur autotrophic denitrification device and method, the device comprises: a housing, which is composed of a middle cylindrical structure and two end hemispherical structures, the upper part of the cylindrical structure is provided with a purified water outlet, the lower part is provided with a backwashing port, and the top end of the hemispherical structure is respectively provided with a sewage inlet and a concentrated liquid outlet; the plurality of supporting bodies are arranged in parallel, each supporting body is composed of two layers of honeycomb-shaped PVC grids and a layer of polypropylene net, and the polypropylene net is clamped between the two layers of honeycomb-shaped PVC grids; the two splitter plates are fixed to the two ends of the supporting body respectively, and splitter holes corresponding to the supporting body are formed in the splitter plates; a large-aperture polypropylene net is used as a filtering support body, and powdered sulfur is used as a precoating agent, so that the problems of difficulty in powdered sulfur recovery and serious loss in the traditional sulfur autotrophic process are solved; meanwhile, sulfur powder with a certain particle size is used as a dynamic membrane reactor of a precoating agent, nitrate nitrogen can be efficiently removed, the effluent quality is improved, and meanwhile the dynamic membrane reactor has the advantages of being resistant to pollution and easy to clean.

The invention relates to the field of filtering materials, in particular to a filtering material for removing silicon and aluminum from ionic membrane caustic soda brine and a preparation method of the filtering material. The filtering material for removing silicon and aluminum from ionic membrane caustic soda brine comprises a hierarchical porous structure carbon adsorption material, the hierarchical porous structure carbon adsorption material comprises a plurality of large holes with the diameter of 800-1000 nm and a plurality of small holes with the diameter of 50-100 nm, and each small hole is located in the hole wall of the corresponding large hole. According to the invention, polymethyl methacrylate microspheres are used as macroporous templates, silicon dioxide nanoparticles are used as microporous templates, and gaps of the templates are filled with a carbon precursor through impregnation. A three-dimensional communicated macropore and micropore hierarchical structure is constructed by a double-template method, macropores are used as channels for rapid diffusion of silica-alumina colloid, and micropores are distributed on the wall surfaces of the macropores to provide a high specific surface area, so that the density of active sites is remarkably increased; the physical screening effect can selectively intercept target impurities, meanwhile, competitive ions such as calcium and magnesium ions are prevented from entering pore channels, and the dynamic adsorption capacity is remarkably improved compared with traditional activated carbon.

A method for determining dynamic strength of loess through average particle size and macropore ratio comprises the following steps: sampling and determining basic physical properties of a soil sample, preparing an artificial structural loess sample, determining loess n, # imgabs0 # under a microstructure, and determining the dynamic strength of the loess according to the average particle size and the macropore ratio. The method comprises the following steps: establishing a three-dimensional model of dynamic characteristics and a microstructure of loess under the action of a dynamic load by utilizing a particle analysis test and a mercury injection test, and fitting a loess sample n, # imgabs1 # formula; fitting a relation formula, establishing a model, and fitting a dynamic internal friction angle, dynamic cohesion, average particle size and macropore proportion formula through data; and finally, measuring the dynamic strength of the loess, and performing simple qualitative verification on the dynamic strength index of the loess by using the neural network according to the given data in the step 4 and adopting the Moire-Coulomb strength theory. The test precision and efficiency are improved.

The invention discloses a graded porous guanidyl resin-based CO2 adsorption material and a preparation method thereof, and belongs to the technical field of polymer synthesis. The prepared adsorption material is of a composite spherical structure and has a multi-stage pore channel structure including micropores, mesopores and macropores, the CO2 adsorption capacity of the material is effectively improved by introducing the hierarchical pore channel structure, the molecular diffusion resistance can be remarkably reduced by introducing hierarchical pore channels, and the contact area of an adsorbent and CO2 molecules is increased, so that rapid adsorption is achieved; and the pyridyl, the polyamino compound and the guanidyl have relatively strong alkalinity and chemical affinity to CO2, and through surface functional modification, active sites on the surface of the material are remarkably increased, so that the adsorption capacity and selectivity of CO2 are further improved.

The invention provides an air spring and application thereof. The air spring comprises a shell, a connecting rod, a piston and an embedded porous material, a closed cavity is defined by the shell, and the closed cavity is filled with gas; the piston is located in the closed cavity, one end of the connecting rod is connected with the piston, and the other end of the connecting rod penetrates through the shell and is located outside the closed cavity; the closed cavity is divided into a closed cavity positive cavity and a closed cavity negative cavity which are independent by a piston, and the closed cavity positive cavity is a cavity where the connecting rod is located; the piston is provided with a through hole capable of being automatically opened and closed, and the through hole controls the communication state between the positive closed cavity and the negative closed cavity. And the embedded porous material is positioned in the positive cavity of the closed cavity and is provided with micropores and macropores. The invention further provides damping equipment comprising the air spring. The rigidity of the air spring is reduced, the damping force change is slowed down, the movement is softer, and the stability is high.

The invention discloses a magnetic immobilized enzyme and a preparation method and application thereof in preparation of chitosan oligosaccharide, the immobilized enzyme comprises a carrier and an enzyme loaded on the carrier, the carrier is a magnetic nanoparticle modified double-hole silicon dioxide nanoparticle, the double-hole silicon dioxide nanoparticle simultaneously contains a plurality of macropores and a plurality of micropores, and the macropores and the micropores are uniformly distributed on the carrier. The aperture of the large hole is 20-40nm, the aperture of the small hole is 2-5nm, and the magnetic immobilized enzyme has strong magnetism, is more rapid and convenient to recover, has good reusability, is simple and convenient to operate, has a wide application prospect, and is suitable for industrial preparation of chitosan oligosaccharide.

The invention relates to the technical field of bentonite, in particular to a preparation method and equipment of composite bentonite loaded microorganisms, and the preparation method comprises the following steps: forming a core precursor, wrapping the outer side of the core precursor with a shell, then extruding to form a double-layer core-shell biochar bentonite composite precursor, and then introducing nitrogen to protect the double-layer core-shell biochar bentonite composite precursor so as to obtain graded porous carbon. Removing substances in macropores in the shell structure, and removing the washing solution through centrifugation and drying to obtain the double-layer core-shell biochar bentonite complex. And finally, uniformly adding the bacterial suspension to the surface of the double-layer core-shell biochar bentonite complex, uniformly mixing, inoculating, culturing in a dark place, and carrying out multiplication culture every 3 days to obtain the immobilized biochar bentonite composite particles. Therefore, loading of microorganisms and nutrient substances is improved through a double-layer shell-core structure, and the adsorption function on the material is increased.

The invention relates to the technical field of porous materials, in particular to an ordered multichannel network structure cellulose / molecular sieve composite material and a preparation method thereof.The composite material is of a stable porous framework structure formed by cellulose, molecular sieves are evenly distributed in the three-dimensional network structure of the composite material, the pore volume is larger than 0.2 cm < 3 > / g, and the composite material is composed of macropores (gt; 50 nm), mesopores (2-50 nm) and micropores (lt; the porous material can be used in a plurality of fields such as gas adsorption, purification and separation, and the like. The preparation method comprises the following steps: uniformly mixing cellulose and a zeolite molecular sieve which are used as raw materials, directionally freezing and co-assembling, and freeze-drying to obtain the cellulose / molecular sieve composite porous material with a macroscopic three-dimensional network structure and directional multiple channels. The prepared cellulose / molecular sieve composite material not only has a self-supporting network skeleton, a rich pore structure and a relatively high specific surface area, but also has directionally arranged pore channels, and the composite material has good flexibility and elasticity.

The preparation method comprises the following steps: S1, adding silicon powder, graphite, a carbon source and a pore-forming agent into a solvent to obtain slurry; the pore-forming agent comprises ammonium citrate and polylactic acid; s2, performing spray drying on the slurry to obtain precursor microspheres; s3, the precursor microspheres are subjected to first-stage low-temperature oxidation to form macropores, second-stage medium-temperature melting to form mesopores, third-stage high-temperature carbonization and cooling shaping, the heat preservation temperature of the first-stage low-temperature oxidation is 180-200 DEG C, the heat preservation temperature of the second-stage medium-temperature melting is 340-360 DEG C, the heat preservation temperature of the third-stage high-temperature carbonization is 800-900 DEG C, and the gradient pyrolysis dual-pore-forming silicon-carbon negative electrode material is obtained. Through combined use of ammonium citrate and polylactic acid and control of gradient pyrolysis conditions, synergistic distribution of double-peak gradient pores is formed, and effective improvement of the first effect and the cycle performance can be realized.

The invention provides a full aperture characterization method based on dynamic time warping, and belongs to the technical field of aperture characterization, and the method comprises the steps: collecting nuclear magnetic resonance T2 spectrum data and aperture distribution data from different experiments, and carrying out the preprocessing and standardization processing of the collected data; performing nonlinear matching processing on the processed nuclear magnetic resonance T2 spectrum data and aperture distribution experimental data by using a dynamic time warping algorithm; and based on a matching result, integrating a gas adsorption experiment, a high-pressure mercury injection experiment and a nuclear magnetic resonance T2 spectrum result, and modeling pore size distribution covering micropores, mesopores and macropores to complete the characterization of the full pore size. The problems that an existing shale oil reservoir pore structure characterization method is not high in resolution within the range of micropores, mesopores and macropores, and experimental data are difficult to integrate are solved.

The invention provides a hierarchical pore sound-absorbing microsphere, a preparation method thereof and a sound-absorbing device. The method for preparing the hierarchical pore sound-absorbing microspheres comprises the following steps: uniformly mixing a zeolite molecular sieve, an inorganic binder, a water-soluble polymer material, a coagulant and an inorganic solvent, and adjusting to acidity to obtain mixed slurry, the water-soluble polymer material having a thermal swelling characteristic; dropwise adding the mixed slurry into a hot oil column by using a liquid drop generator, and heating and curing to obtain composite microspheres; and calcining the composite microspheres to obtain the hierarchical porous sound-absorbing microspheres. The prepared hierarchical-pore sound-absorbing microspheres comprise rich micropores, mesopores and macropores, the air compliance of the microspheres can be obviously improved, air can enter and exit the micropores more smoothly and quickly, the actual use efficiency of the micropores is improved, and therefore the low-frequency response is improved; the hierarchical-pore sound-absorbing microspheres prepared by the method are good in sphericity degree and not prone to powder falling due to friction, the production cost is low, the method is easy to implement and operate, and industrial mass production is facilitated.

The present application relates to the technical field of nano-catalytic material preparation, in particular to a preparation method of multi-stage pore mesoporous carbon loaded metal nanoparticles, which constructs vertical and through macroporous channels by taking biomass diatomite as a template, forms ordered mesoporous structure by introducing block copolymer, and realizes macro-pore-mesopore-micropore three-stage communication of carbon-based skeleton by adding porogen to produce macro-porous network in the pyrolysis process, and gradientally limits and loads bimetallic components on the multi-stage pore mesoporous carbon. The material has the advantages of macroporous rapid mass transfer, mesoporous limited stable nanoparticles and single-atom site efficient catalysis, and can efficiently catalyze and degrade various wastewater organic pollutants in a wide pH range.