731results about "Aerogel preparation" patented technology

The invention relates to a flame-retardant and heat-insulating aerogel composite material as well as a preparation method and application thereof, and belongs to the technical field of novel building materials. The fiber aerogel is prepared through coaxial electrostatic spinning, an injector containing a polymer spinning solution is connected to a skin layer needle tube connecting port, an injector containing air is connected to a core layer needle tube connecting port, coaxial electrostatic spinning is carried out to prepare micron fibers with skin-core structures, the micron fibers fall on a receiving base material, and the micron fibers with the skin-core structures fall on the receiving base material. A hollow fiber aerogel material with a three-dimensional fluffy structure is obtained, in-situ growth of hydrated nano silicate particles is carried out after thermal crosslinking treatment, the nano silicate particles grow along the fiber surface and cover the micron fiber surface of the hollow fiber aerogel material, and the aerogel composite material is obtained. The hydrated nano silicate particle growth solution comprises polyvinyl alcohol, calcium salt, silicate and aluminum salt. The prepared aerogel composite material has excellent flame retardance and heat insulation performance and is suitable for being used as a building material.

The invention provides a super-hydrophobic / super-oleophylic degradable photo-thermal aerogel adsorption material and demulsification performance thereof, and belongs to the technical field of oil-water separation materials, and the super-hydrophobic / super-oleophylic degradable photo-thermal aerogel adsorption material is prepared by the following steps: (1) extracting cellulose from waste cartons and performing ultrasonic dispersion to prepare a cellulose suspension; (2) preparing a chitosan solution; (3) mixing the cellulose suspension and the chitosan solution to obtain a cellulose / chitosan composite solution, adding nano carbon black particles, glutaraldehyde and a methyltrimethoxysilane aqueous solution into the cellulose / chitosan composite solution, and stirring; (4) injecting the mixed solution into a mold, and performing directional freezing on a semiconductor refrigeration platform; and (5) performing freeze drying on the frozen sample, and then putting the frozen sample into a drying oven for cross-linking to obtain the aerogel. The aerogel is obtained by taking cellulose extracted from waste cartons and chitosan as organic frameworks, carrying out chemical crosslinking through glutaraldehyde, introducing nano carbon black particles as photo-thermal components and carrying out hydrophobic modification through methyltrimethoxysilane, and has an excellent pore structure, super-hydrophobicity-super-lipophilicity and excellent mechanical properties; the adsorbent has efficient adsorption capacity on high-viscosity crude oil; and the device can be repeatedly used and is biodegradable, so that the burden on the environment is reduced.

The invention belongs to the field of coal gangue resource utilization, and particularly discloses a method for preparing fiber-reinforced coal gangue-based composite functional aerogel. After being activated, the coal gangue is put into an acid leaching solution to be leached, and an aluminum-rich solution is obtained; adding ammonia water into the aluminum-rich solution to adjust the pH to obtain hydroxide precipitate; adding a sodium hydroxide solution into the precipitate to react to obtain a sodium aluminate solution; neutralizing the sodium aluminate solution with hydrochloric acid to obtain an aluminum chloride solution, stirring to obtain aluminum sol, and adding ceramic fibers into the aluminum sol; violently stirring the sol, and adding epoxypropane to obtain wet gel; after aging the wet gel, carrying out surface modification to obtain hydrophobic coal gangue-based aluminum oxide and composite wet gel of the hydrophobic coal gangue-based aluminum oxide; and drying the modified wet gel at normal pressure to obtain the hydrophobic coal gangue-based aluminum oxide and the composite aerogel thereof. Ceramic fibers are introduced as a reinforcing phase, so that the compressive strength and toughness of the material are improved; the composite aerogel is subjected to surface modification, uniform modification is ensured, the contact angle is remarkably increased, the hygroscopicity is reduced, and the stability of the material is enhanced.

The invention relates to the technical field of self-thermal-insulation mortar, in particular to self-thermal-insulation mortar and a preparation method thereof. Comprising the following components: Portland cement, a gradient graphene aerogel skeleton, metal organic framework nanoparticles, photo-thermal-phase change coupling microcapsules, magnetic field orientation Fe3O4 nanosheets, self-repairing microcapsules, silicon carbide nanowire aerogel, a water reducing agent and a fiber reinforced material. The gradient graphene aerogel skeleton, the photo-thermal-phase change coupling microcapsules and other materials with excellent thermal insulation performance are introduced, and a multi-layer thermal insulation structure is constructed. The gradient graphene aerogel skeleton has extremely low heat conductivity coefficient and high porosity, and can effectively prevent heat transfer; the photo-thermal-phase change coupling microcapsules can absorb and release a large amount of heat in the phase change process, and the heat preservation effect of the mortar is further improved.

The invention provides a super-hydrophobic passion fruit peel carbon aerogel VOCs adsorbent based on low-temperature plasma synergistic nitrogen doping modification and a preparation method thereof, and relates to the technical field of VOCs adsorbents. The super-hydrophobic passion fruit peel carbon aerogel VOCs adsorbent based on low-temperature plasma synergistic nitrogen doping modification is prepared by crushing passion fruit peel, mixing the crushed passion fruit peel with a nitrogen-containing compound to form gel, performing low-temperature plasma modification, performing freeze drying, performing high-temperature carbonization, and performing water washing and drying. The adsorbent is spherical, and the water contact angle is 115.8 degrees to 152.4 degrees. The adsorbent disclosed by the invention has the advantages of super hydrophobicity, high specific surface area, developed microporous structure, excellent VOCs adsorption performance, broad-spectrum adsorption capacity, good reusability and mechanical strength, the preparation method is simple in process, green and environment-friendly, low in cost and good in universality, a new technical scheme is provided for VOCs treatment in a high-humidity environment, and the adsorbent has a good application prospect.

The invention belongs to the technical field of radioactive wastewater treatment, and particularly relates to composite aerogel for adsorbing Cs < + > and Sr < 2 + > in radioactive wastewater under an acidic condition and a preparation method of the composite aerogel. The preparation method of the composite aerogel comprises the following steps: (1) synthesizing ammonium phosphomolybdate / sodium alginate aerogel; (2) growing ZIF-8 on the surface of the ammonium phosphomolybdate / sodium alginate aerogel; and (3) modifying the surface of the material obtained in the step (2) by using potassium permanganate to generate MnO2, thereby obtaining the composite aerogel. The composite aerogel can efficiently adsorb Cs < + > and Sr < 2 + > in wastewater to realize efficient co-adsorption of double ions, and has the advantages of low energy consumption, high selective separation efficiency, capability of carrying out one-step curing separation, no secondary pollution and capability of effectively avoiding the defects of redundant separation operation and large waste liquid amount in a traditional method, and a high-capacity and easily-recycled adsorbent scheme is provided for radioactive wastewater treatment.

The present disclosure provides an aerogel composite encapsulation structure and a method for making the aerogel composite encapsulation structure. The method for making the aerogel composite encapsulation structure includes providing an aerogel composite with a hydrophobic modifier, and disposing an encapsulation film on a surface of the aerogel composite, so that the aerogel composite is encapsulated by the encapsulation film. The hydrophobic modifier is grafted on at least surface of the aerogel composite, and a thickness of the aerogel composite ranges from 0.09mm to 5mm. A thickness of the encapsulation film ranges from 0.01mm to 0.3mm, and a material of the encapsulation film includes a plastic encapsulation material.

The invention discloses a preparation method of a salt-resistant double-layer photo-thermal aerogel evaporator. The preparation method comprises the following steps: S1, cutting and cleaning foamed nickel, and then carrying out vacuum drying; s2, preparing Cu2O / NF (nickel nitrate); s3, preparing ppy-Cu2O / NF (nickel fluoride); s4, preparing hydrogel; and S5, flatly placing a sample ppy-Cu2O / NF on the top surface of the hydrogel, continuing to stand for gelling, enabling the photo-thermal layer and the bottom layer hydrogel to be fully combined, pre-freezing, transferring into a freeze dryer, and freeze-drying to finally obtain the salt-tolerant double-layer photo-thermal aerogel evaporator, namely the lightweight porous aerogel material ppy-Cu2O / NF / FCP with the double-layer structure. The device has the advantages that the high-level evaporation rate and efficient energy conversion are achieved, and efficient photo-thermal conversion and heat management are achieved through the double-layer structure design.

The invention provides a microbial slow-release porous composite material for sewage treatment as well as a preparation method and application thereof. The preparation method comprises the following steps: dropwise adding an organic ligand solution into a precursor solution consisting of a nanocellulose solution and a cobalt source solution; mixing the reaction solution with polyvinyl alcohol, injecting the mixture into a mold, and performing directional freezing to obtain an aerogel matrix; carrying out hydrophobic modification on the aerogel matrix to obtain a modified aerogel matrix; mixing the microbial suspension with sodium alginate, and homogenizing at high pressure to obtain a gel precursor emulsion; the preparation method comprises the following steps: dropwise adding a calcium chloride solution to gelatinize to obtain gel particles, and then cross-linking and drying by glutaraldehyde to obtain sustained-release capsule particles; dispersing the sustained-release capsule particles in deionized water to obtain dispersion liquid; and dipping the modified aerogel matrix in the dispersion liquid. An aerogel matrix with a hierarchical porous structure is compounded with a sustained-release capsule with a pH response mechanism, so that physical adsorption, chemical catalysis and biodegradation for sewage treatment are realized.

The invention discloses a method for improving photo-thermal conversion efficiency of a photo-thermal material under large-range light intensity, the photo-thermal material and a solar heat collector, and belongs to the field of solar evaporation water treatment. According to the technical scheme, the method comprises the steps that polyaniline particle-loaded carbon aerogel is prepared, the light intensity range is greatly widened to 10 sunlight intensities or above through a Fresnel lens, the corresponding relation between the material surface water evaporation rate and the temperature change is established, and the energy loss is reduced to the maximum extent by adding a foam side heat insulation layer; and the water evaporation rate of the photo-thermal material is improved. The method is applied to the aspect of solar water evaporation, and the problem that the water evaporation rate is low in an existing solar evaporation method is solved.

The invention discloses a Janus super-wettability gradient pore structure cellulose aerogel material for efficient seawater desalination and oil-water separation as well as a preparation method and application of the Janus super-wettability gradient pore structure cellulose aerogel material. According to the aerogel material, a self-assembled gradient pore structure is matched with a high-strength bio-based skeleton formed by chemical crosslinking, an enhanced chemical crosslinking-physical strengthening network structure is formed, and finally solution replacement and normal-pressure drying are performed in absolute ethyl alcohol to obtain the aerogel material. Under the support of a chemical crosslinking effect and a gradient pore physical structure formed by self-assembly of the material, the integrity and mechanical strength of the pore wall of the obtained material are ensured, and meanwhile, in the aerogel preparation and modification process of PVA, PEI and MTMS, the material has excellent upper and lower double-layer super-hydrophobic and super-hydrophilic asymmetric wettability; therefore, the composite material has efficient oil-water emulsion separation performance, lasting super-hydrophilic / underwater super-oleophobic stability, excellent mechanical performance and seawater desalination treatment performance in a high-salinity environment.

The application discloses a MnFe2O4 / GO wave-absorbing aerogel with a directional aperture structure and a preparation method thereof, belongs to the technical field of wave-absorbing material preparation, and is characterized in that manganese ferrite (MnFe2O4) magnetic particles are uniformly loaded on the surface of graphene to obtain a graphene aerogel with a three-dimensional loose porous structure and magnetic particle assembly; the MnFe2O4 is prepared by using a low-temperature co-precipitation method, and the MnFe2O4 / GO wave-absorbing aerogel is prepared by combining directional freezing and heat treatment, and the method is mild and simple. The application improves the impedance mismatch problem of the graphene material, enhances the magnetic loss of the material, and obtains a novel porous aerogel wave-absorbing material which has both dielectric loss and magnetic loss by introducing the manganese ferrite.

The invention discloses a stirring and separating device for aerogel preparation, and relates to the technical field of aerogel preparation, the stirring and separating device comprises a stirring tank, a centrifugal assembly and a stirring assembly, the stirring tank is internally provided with the centrifugal assembly, and the bottom end of the centrifugal assembly is fixedly connected with the stirring assembly; the stirring assembly comprises a stirring assembly arranged in the stirring tank, and a driving assembly is arranged at the top end of the stirring assembly; the centrifugal assembly comprises a separation assembly, and an adjusting assembly is arranged on the side face of the separation assembly. According to the aerogel preparation device, uniform stirring and impurity cleaning in the aerogel preparation process can be achieved, and the aerogel production efficiency is reduced.

The invention belongs to the technical field of building materials, and particularly relates to a building thermal insulation aerogel material and a preparation method, the aerogel material comprises the following components by mass: 25-35 parts of a silicon source, 40-80 parts of a solvent, 0.3-0.6 part of a catalyst, 4-13 parts of an aluminum source, 9-20 parts of reinforcing fibers, 4-10 parts of a modifier, and 20-40 parts of carrier fibers; the silicon source is ethyl orthosilicate or methyl trimethoxy silane; the solvent is absolute ethyl alcohol; the catalyst is hydrochloric acid or ammonia water; the aluminum source is aluminum nitrate nonahydrate or aluminum isopropoxide; the reinforced fibers are nano titanium dioxide fibers; the modifying agent is gamma-aminopropyl triethoxy silane or gamma-methacryloyloxy propyl trimethoxy silane, and the modifying agent is gamma-aminopropyl triethoxy silane or gamma-methacryloyloxy propyl trimethoxy silane; the carrier fiber is rock wool or mineral wool. According to the invention, the thermal insulation aerogel material for buildings, which is high in mechanical strength, good in weather resistance and excellent in thermal insulation performance, can be prepared, so that the requirements of the building industry on high-performance thermal insulation materials can be met.

The invention discloses a multi-site intelligent response type CO2 gas channeling prevention gel and a preparation method, and belongs to the field of chemical oil displacement, and the preparation method comprises the following steps: taking a carbon dioxide response type monomer, acrylamide and sodium acrylate as monomers, and adopting water-soluble free radical polymerization to prepare a CO2 response type copolymer; the CO2 response type copolymer, a cross-linking agent, a stabilizer, a retarder and formation water are prepared into a polymer cross-linking agent mixed solution, a cross-linking reaction is carried out under the conditions of formation temperature and mineralization degree, and the multi-site intelligent response type CO2 gas channeling prevention gel is obtained. The gel effectively solves the problems that a traditional anti-channeling agent is poor in injectivity in a low-permeability and ultra-low-permeability oil reservoir and cannot achieve deep channeling sealing, CO2 gas channeling fractured channels can be effectively blocked, the carbon dioxide oil displacement effect is remarkably improved, and key technical support is provided for large-scale application of carbon dioxide displacement.

The invention discloses a preparation method of biomass fiber aerogel for micro-plastic adsorption, and belongs to the field of micro-plastic adsorption. The preparation method comprises the following steps: (1) preparing a covalent cross-linking mixture by taking biomass nanofibers as a base material; (2) carrying out foaming treatment on the covalent cross-linking mixture by using a surfactant; (3) carrying out circulating freezing and thawing treatment on the covalent cross-linking mixture subjected to foaming treatment; and (4) performing normal-pressure drying on the covalent cross-linking mixture subjected to circulating freezing and thawing treatment to obtain the biomass fiber aerogel. The biomass fiber aerogel material obtained by the invention has high porosity and can effectively adsorb various micro-plastics, and the preparation process used in the invention does not need critical condition drying equipment, so that the preparation cost and period of aerogel are reduced, and the biomass fiber aerogel material has industrial large-scale production potential.

The invention relates to the technical field of silicon-aluminum aerogel preparation, in particular to a method for preparing high-temperature-resistant silicon-aluminum aerogel by using a coal gangue one-step method, which comprises the following steps: S1, crushing, grinding and sieving coal gangue, mixing the coal gangue with an alkaline solid, and calcining to obtain alkali fusion powder; s2, the alkali fusion powder is subjected to acid treatment and suction filtration, and a silicon-aluminum solution is obtained; s3, adding polystyrene-coated zirconium oxide particles into the silicon-aluminum solution, and sequentially carrying out gelation, primary aging, solvent washing, water washing and secondary aging; s4, washing, replacing and modifying the gel; and S5, drying the hydrophobic wet gel obtained in the step S4 at normal pressure to obtain the silicon-aluminum aerogel. The silicon-aluminum aerogel prepared by the method has the advantages of low density, good thermal stability, high specific surface area, strong hydrophobic property and high strength.

The invention discloses a high-adhesion solid-state capacitor carbon foil production process, and relates to the technical field of solid-state capacitor carbon foils. The preparation method comprises the following steps: generating a three-dimensional graphene layer in situ on the surface of an aluminum foil by a chemical vapor reduction method; secondly, the graphene layer is modified by utilizing aluminum nitrate ammonium nitrate, and then the Ni-Al layer with a continuous lamellar structure is prepared on the graphene layer through electrochemical deposition, so that active sites are provided, and the ion diffusion capability of the carbon foil is remarkably improved; finally, mixing ethylene diamine tetraacetic acid dipotassium salt and corn starch to prepare nitrogen-doped carbon aerogel, preparing the nitrogen-doped carbon aerogel into powder, and coating the surface of the Ni-Al layer with the powder to prepare a four-layer composite carbon foil; by doping nitrogen atoms, the surface chemical performance of the carbon aerogel material can be changed, the wettability of an electrode is improved, the diffusion rate of electrolyte ions is increased, and the specific capacity of the material is increased, so that the overall electrochemical performance of the carbon foil is improved. The four-layer composite carbon foil prepared by the invention has the effects of high adhesion and excellent electrochemical performance.

The invention belongs to the technical field of electro-catalysis, and particularly relates to a one-pot preparation method of a high-alloying gold-silver alloy aerogel material and application of the high-alloying gold-silver alloy aerogel material in electro-catalytic reduction of CO2. According to the preparation method, chloroauric acid and silver nitrate are selected as precursors for synthesizing the AuAg alloy aerogel, the AuAg alloy aerogel is prepared through a simple one-pot preparation method, and complex processes such as ultrafiltration centrifugal purification and concentration and heat treatment are not needed. Compared with an existing two-step method, the preparation process is complex, time and labor are consumed, and heat treatment is needed. However, according to the one-pot preparation method used in the invention, the high-alloying AuAg alloy aerogel can be obtained only by simply feeding, stirring and standing at room temperature. Moreover, the alloying degree of the obtained AuAg aerogel is higher, higher CO selectivity is shown in CO2RR application, and compared with AuAg alloy aerogel obtained through an existing two-step method, the CO Faraday efficiency of the AuAg aerogel is improved by about 37.1%.

There is provided a method of making an alkoxy silicate-based aerogel material, the method comprising: hydrolysing an alkoxy silicate in a hydrolytic solvent to form a silica sol for a pre-determined period of time and at a pH of 1-4; mixing the silica sol with a basic solution to form a sol-gel; a first ageing the sol-gel; adding a surface-modifying agent to the sol-gel; a second ageing the sol-gel; and heating the sol-gel at a temperature of 120-250° C. to form the alkoxy silicate-based aerogel material, wherein the alkoxy silicate-based aerogel material has a thermal conductivity of <18 mW / mK. There is also provided an alkoxy silicate-based aerogel material formed from the method.

The invention provides an aerogel composite material packaging structure and a preparation method thereof. The preparation method of the aerogel composite material packaging structure comprises the following steps: providing an aerogel composite material of which at least the surface is grafted with a hydrophobic modifier; the thickness of the aerogel composite material is 0.09 mm to 5 mm; coating the surface of the aerogel composite material with a packaging film; the thickness of the packaging film ranges from 0.01 mm to 0.3 mm, and the packaging film comprises a plastic packaging material. According to the preparation method of the aerogel composite material packaging structure, a modifier is grafted on the surface of an aerogel composite material, so that the permeation probability of liquid generated in the packaging film coating process and / or the permeation probability of liquid generated by heating and melting during thermal insulation application in a thermal environment after the packaging film is coated is reduced; therefore, the influence of the packaging film of the aerogel composite material on the heat insulation performance of the aerogel composite material is reduced, and the heat insulation performance of the packaged aerogel composite material packaging structure is further improved.

The present invention relates to the field of solar-driven interfacial photothermal evaporation technology, and more particularly to a solar-driven interfacial evaporator based on TiN / polyimide aerogel, its preparation method, and application. The TiN / polyimide aerogel comprises a polyimide aerogel matrix with vertical channels connecting upper and lower surfaces, loaded with TiN nanoparticles. The aerogel is prepared by polycondensation, dehydration, and cyclization of the polyimide aerogel 4,4'-diaminodiphenyl ether and 4,4'-oxydiphthalic anhydride. The TiN / polyimide aerogel provided by the present invention, when used as a solar-driven interfacial evaporator, can not only improve the water transfer performance of a three-dimensional photothermal evaporator, but also increase the photothermal evaporation rate during seawater desalination.

The invention provides a CuCoNi-MOF aerogel nano-enzyme, a preparation method thereof and a detection reagent, and belongs to the technical field of antibody detection.The preparation method of the aerogel nano-enzyme comprises the following steps that bivalent copper salt, bivalent cobalt salt and bivalent nickel salt are mixed, then a reducing agent is added to reduce bivalent metal ions, then a dimethylimidazole solution is added, and the CuCoNi-MOF aerogel nano-enzyme is obtained. And reacting at 25-35 DEG C for at least 1 hour, finally taking out the precipitate after the reaction, washing with deionized water, and freeze-drying to obtain the target product. The detection reagent provided by the invention is prepared from the aerogel nano-enzyme as a raw material. The aerogel nano enzyme has high activity and strong stability, and can form a detection reagent with stable properties with a protein biomarker, and meanwhile, the preparation method is simple and convenient, and does not need expensive instruments, so that the manufacturing cost can be reduced. The detection reagent provided by the invention has very high sensitivity and accuracy.

The invention discloses a graphene oxide-chitosan-carboxymethyl cellulose composite aerogel and an application of the graphene oxide-chitosan-carboxymethyl cellulose composite aerogel in adsorption of amaranth. The preparation method comprises the following steps: mixing a carboxymethyl cellulose aqueous solution with a chitosan acetic acid solution, adding gallic acid, stirring until the gallic acid is completely dissolved, adding the graphene oxide dispersion liquid, and stirring until a system forms uniform and stable gel; the gel is firstly subjected to ultralow-temperature freezing and then subjected to freeze drying, and finally the graphene oxide-chitosan-carboxymethyl cellulose composite aerogel is obtained. The aerogel prepared by the method is environment-friendly and stable in pore structure, and is a composite aerogel material with high adsorption capacity and good regeneration performance on anionic dyes. The adsorption capacity of the aerogel to amaranth can reach 125 mg / g, the adsorption rate is still kept at 77% after the aerogel is recycled for 3 times, and the aerogel is suitable for efficient treatment of dye wastewater.

The invention provides an aluminum oxide aerogel composite material as well as a preparation method and application thereof, and belongs to the technical field of aluminum oxide aerogel preparation. The preparation method provided by the invention comprises the following steps: (1) preparing aluminum sol by taking coal gangue as an aluminum source; (2) mixing the aluminum sol obtained in the step (1) with aluminum silicate fibers, and performing gelation to obtain composite hydrogel; and (3) mixing the composite hydrogel obtained in the step (2) with ethanol, aging, mixing with a modifier, modifying, and carrying out graded normal-pressure drying to obtain the aluminum oxide aerogel composite material, the modifier in the step (3) is one or more of absolute ethyl alcohol, tetraethoxysilane and normal hexane. The alumina aerogel composite material prepared by the preparation method provided by the invention has the characteristics of low density, low heat conductivity coefficient and high strength, and is suitable for the high-temperature processing field of special materials and the aerospace field.

The present disclosure relates to materials and systems to manage thermal runaway issues in energy storage systems. Exemplary embodiments include a barrier having a mechanically compressible layer that allows fluid flow through the barrier. The present disclosure further relates to a battery module or pack with one or more battery cells and the barrier placed in thermal communication with the battery cells.

The invention discloses a preparation method of platinum-based multi-metal aerogel and application of the platinum-based multi-metal aerogel in an electro-catalysis hydrogen evolution reaction. The method comprises the following steps: firstly, sequentially adding platinum salt and other metal salts into pure water, uniformly mixing, then adding a sodium borohydride solution, uniformly mixing, quickly freezing the reaction solution with liquid nitrogen, melting to obtain wet gel, and then washing and drying the wet gel to obtain the aerogel. The obtained metal aerogel is applied to a hydrogen evolution electrocatalyst and shows excellent catalytic activity under an alkaline condition. The preparation method has the advantages that the synthesis process is simple, convenient and efficient, regulation and optimization of an electronic structure can be realized through interaction among multiple metals, so that the catalytic performance is improved, the porous structure of the aerogel effectively provides a high-speed mass transfer channel, the catalytic activity is improved, and the preparation method is suitable for industrial production. And a solid foundation is laid for wide application of the metal aerogel material in the field of industrial chemical engineering.

The invention belongs to the technical field of carbon aerogel, and particularly relates to nitrogen-doped carbon aerogel as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) uniformly mixing a carbon source, a nitrogen source and a solvent to obtain nitrogen-doped gel; (2) aging the nitrogen-doped gel, and drying to obtain nitrogen-doped dry gel; and (3) carbonizing the nitrogen-doped dry gel to obtain the nitrogen-doped carbon aerogel. The preparation method is simple in process and low in cost, and the prepared nitrogen-doped carbon aerogel has a high specific surface area, a rich pore structure and good magnetic performance, and has a wide application prospect in the fields of environmental governance and energy storage. According to the invention, pollutants in wastewater can be efficiently adsorbed, and rapid separation and recovery can be realized under the action of an external magnetic field; in energy storage, the material shows excellent electrochemical performance as an electrode material of a supercapacitor.

The invention belongs to the technical field of air purification, and discloses a nitrogen-doped MOF derived hollow porous carbon-rare earth metal doped MnO2-graphene aerogel composite material as well as a preparation method and application thereof. The preparation method provided by the invention comprises the following steps: taking a nitrogen-containing organic heterocyclic ligand, a nitrogen doping agent, a non-noble metal salt compound and chitosan, carrying out a first hydrothermal reaction, carrying out tannic acid etching and first calcination treatment, carrying out MnO2 in-situ growth on the obtained nitrogen-doped MOF derived hollow porous carbon material, and introducing a rare earth metal salt compound to obtain the nitrogen-doped MOF derived hollow porous carbon material. And finally, taking the obtained nitrogen-doped MOF derived hollow porous carbon-rare earth metal doped MnO2 composite material, graphene oxide and a reducing agent to carry out second hydrothermal reaction, ethanol soaking, freezing and freeze-drying treatment to obtain the nitrogen-doped MOF derived hollow porous carbon-rare earth metal doped MnO2 composite material. The nitrogen-doped MOF-derived hollow porous carbon-rare earth metal doped MnO2-graphene aerogel composite material has excellent adsorption and catalytic degradation activity on TVOC (Total Volatile Organic Compounds) such as formaldehyde and the like, and the composite material has a good application prospect in air purification.

A natural aldehyde-functionalized all-biomass aerogel and a preparation method thereof, the method comprises: (1) dispersing chitosan in a starch-like fiber solution and stirring to obtain a uniform mixed solution; (2) adding genipin as a crosslinking agent to the mixed solution obtained in step (1), heating and stirring for a period of time to obtain an aerogel precursor solution, and allowing the same to stand to undergo crosslinking to obtain a hydrogel; (3) freezing the hydrogel obtained in step (2), and then freeze-drying to obtain an aerogel; (4) soaking the aerogel obtained in step (3) in a natural aldehyde solution for graft modification, then removing and rinsing, and subsequently drying to obtain the aldehyde-functionalized aerogel.