9683 results about "Freeze-drying" patented technology

Various embodiments of freeze dryers and drying processes are disclosed that can be used to dry materials with low water content (no more than 20 wt % water) and / or high sugar content (at least 20 wt % sugar). Such materials include candy, confections, and the like. In one embodiment, a drying process includes drying the materials without freezing them. In another embodiment, a drying process includes warming the materials before drying them. In another embodiment, a drying process includes drying two batches of materials with low water content sequentially without defrosting the interior of freeze dryer.

The invention provides a probiotics plant solid beverage for treating hyperuricemia and gout. The solid beverage is prepared by mixing freeze-dried probiotics powder and plant extract with the addition of proper auxiliary materials. The solid beverage comprises the following components: the plant extract, the auxiliary materials and the probiotics, with the sum of the mass percentage of each component being 100%. The plant extract comprises celery seed powder, sophora flower bud powder and platycodon root powder. The invention has an obvious effect on lowering uric acid and relieving gout.

The present invention is directed to a storage-stable formulation of long-chain RNA. In particular, the invention concerns a dry powder composition comprising a long-chain RNA molecule. The present invention is furthermore directed to methods for preparing a dry powder composition comprising a long-chain RNA molecule by spray-freeze drying. The invention further concerns the use of such a dry powder composition comprising a long-chain RNA molecule in the preparation of pharmaceutical compositions and vaccines, to a method of treating or preventing a disorder or a disease, to first and second medical uses of such a dry 10 powder composition comprising a long-chain RNA molecule and to kits, particularly to kits of parts, comprising such a dry powder composition comprising a long-chain RNA molecule.

The invention belongs to the technical field of gel materials, and particularly relates to aerogel powder for polyolefin modification and a preparation method and application thereof. The preparation method of the aerogel powder comprises the following steps: (1) preparing aramid nanofiber dispersion liquid; (2) preparing a polypyrrole coated aramid nanofiber dispersion liquid; (3) mixing polyamide acid and the polypyrrole coated aramid nanofiber dispersion liquid, and then carrying out partial imidization and solvent exchange to prepare hydrogel; and (4) carrying out freeze drying, thermal imidization and crushing to obtain the aerogel powder for polyolefin modification. The aerogel powder is a porous solid material formed by forming one-dimensional composite fibers from aramid nanofibers and polypyrrole and combining the one-dimensional composite fibers with polyimide resin. The aerogel powder and polyolefin resin are compounded to obtain the polyolefin resin composite material with high strength and antistatic property, and the polyolefin resin composite material can be widely applied to the fields of pipes, plates, grouting equipment parts, grouting bags and the like.

The invention belongs to the technical field of aerogel materials, and particularly relates to antistatic aerogel for 3D printing as well as a preparation method and application of the antistatic aerogel. The preparation method comprises the following steps: (1) dispersing inorganic nanoparticles modified by a silane coupling agent containing epoxy groups and an aniline monomer in an acidic solvent to obtain a monomer mixed solution; (2) stirring and dissolving polyamide in the monomer mixed solution; (3) initiating a reaction to obtain a polyaniline modified polyamide solution; and (4) freeze-drying to obtain the antistatic aerogel for 3D printing. By controlling synthesis conditions, a core-shell structure of acid-doped polyaniline coated inorganic nanoparticles is formed, and a good conductive path is formed in polyamide with a small addition amount of polyaniline. The antistatic aerogel for 3D printing can be applied to technologies such as photocuring molding and fused deposition of polyurethane resin in a 3D printing technology, and the antistatic property and the mechanical property of a 3D printed product are improved.

The invention relates to a method for preparing lithium sulfide, which comprises the following steps: respectively dissolving a sulfur source compound and a lithium source compound in alcohol under the protection of inert atmosphere, and then mixing the two alcohol solutions for double decomposition reaction to generate a lithium sulfide suspension; and then carrying out evaporative crystallization, supercritical fluid washing, centrifugal separation and freeze drying treatment to obtain a lithium sulfide product. The purity of the lithium sulfide prepared through the method can reach 99.9% or above, the lithium sulfide can be used as a positive electrode material of a lithium-sulfur battery or a raw material of a sulfide solid electrolyte in an all-solid-state battery, and the method is low in energy consumption, conforms to the concept of green chemistry and is suitable for large-scale industrial production.

The invention relates to the technical field of freeze-dried preparations, and provides exosome freeze-dried powder as well as a preparation method and application thereof. The exosome freeze-drying preparation is prepared by mixing an exosome solution and a freeze-drying protection solution and then freeze-drying the mixture, the concentration of the exosome solution in the mixed solution is 0.1-10% V / V, and the freeze-drying protection solution comprises 0.4-4% W / V of saccharides and 0.25-4% W / V of alcohols; the saccharide is trehalose, cane sugar or lactose; the alcohol is mannitol, sorbitol or a combination of mannitol and polyethylene glycol; and the solvent is sterilized water for injection or a PBS buffer solution. The exosome freeze-dried powder is stable in activity, small in irritation, good in safety and good in fibroblast proliferation promoting capacity, when the exosome freeze-dried powder is applied to supporting essence or masks in the medical beauty industry, the exosome activity of the exosome freeze-dried powder is still kept stable, and the application prospect is good.

The invention discloses a foam cement-based sound absorption material with an adjustable and controllable pore structure and a preparation method of the foam cement-based sound absorption material, and belongs to the technical field of building functional materials. Aiming at the problems of insufficient pore structure regulation and control, limited sound absorption performance and high cost of a traditional cement-based sound absorption material, P.O42.5R Portland cement is used as a basis, a physical-chemical synergistic foaming method and a three-stage gradient temperature control freeze-drying process are combined through the synergistic effect of a composite foaming agent, a microporous structure regulator and a composite pore forming agent, and the sound absorption material is prepared. Precise regulation and control of pores from the nm level to the mm level are achieved, and an interconnected pore channel network with the high open porosity is formed. The density of the obtained material is 200-1000 kg / m, the porosity is 60-90%, the aperture coverage range is 2 nm-6 mm, the open porosity is 70-85%, the 28d compressive strength is 1.83-14.56 MPa, the average sound absorption coefficient in the frequency range of 250-2000 Hz is 0.12-0.62, and the noise reduction coefficient is 0.14-0.64. The composite material has the characteristics of adjustable pore structure, light weight, high strength, broadband sound absorption, low cost and good durability, and is suitable for the noise control fields of building walls, traffic facilities and the like.

The present invention provides a Lacticaseibacillus rhamnosus UP180, and its preservation number is CGMCC NO.32109. The present invention also provides a fermentation product obtained by fermenting astragalus extract by the Lacticaseibacillus rhamnosus UP180. The present invention also provides a probiotic preparation, including the Lacticaseibacillus rhamnosus UP180, which helps to promote growth and development. The present invention also provides a preparation method of the probiotic preparation, including the steps of fermenting and culturing the probiotics to obtain bacterial mud, and freeze-drying the bacterial mud after mixing it with a freeze-drying protective agent. It is convenient for subsequent industrial applications.

The invention relates to the technical field of fine chemicals, in particular to crosslinking-agent-free Pickering emulsion oil gel and a preparation method and application thereof.The preparation method comprises the following steps that S1, cellulose is subjected to TEMPO oxidation treatment and then subjected to high-pressure homogenization, and TEMPO oxidized nano cellulose is obtained; s2, mixing the TEMPO oxidized nanocellulose and lemon essential oil in proportion, and homogenizing to obtain Pickering emulsion; s3, carrying out heat preservation on the Pickering emulsion at the temperature of 70-90 DEG C for 6-12 hours to obtain Pickering emulsion gel, freezing the Pickering emulsion gel at the temperature of-80 + / -5 DEG C for 30-40 minutes until the Pickering emulsion gel is completely frozen, and carrying out freeze drying for 24-48 hours to obtain Pickering emulsion oil gel; and S4, soaking the Pickering emulsion oil gel in acetone for 6-12 hours, taking out the Pickering emulsion oil gel, and freeze-drying the Pickering emulsion oil gel for 24-48 hours to obtain the Pickering emulsion aerogel. The Pickering emulsion aerogel has better thermal stability, larger specific surface area, cumulative pore volume and average pore size, and is prepared without using a cross-linking agent for cross-linking.

The invention discloses a chitosan modified lithium iron phosphate and carbon composite positive electrode material and a preparation method thereof.The preparation method comprises the steps that 1, lithium hydroxide, phosphoric acid and ferrous sulfate heptahydrate are mixed to prepare a uniform and stable solution, and a lithium iron phosphate precursor is prepared through a solvothermal method; step 2, dissolving chitosan in an acetic acid aqueous solution, and magnetically stirring under a water bath condition until the chitosan is completely dissolved to prepare a chitosan solution; and 3, adding the lithium iron phosphate precursor into a chitosan solution, uniformly mixing, carrying out ball milling and freeze drying, and carrying out high-temperature carbonization treatment in an inert gas to obtain the chitosan modified lithium iron phosphate and carbon composite positive electrode material. The method is simple to operate, low in cost and uniform in product particle size distribution.

The invention belongs to the technical field of polymer heat conduction, and particularly relates to a preparation method of a high-heat-conductivity polymer with modified boron nitride as filler, which comprises the following steps: (1) dissolving boron nitride nanosheets into tetrahydrofuran, ultrasonically dispersing uniformly, adding a modifier for reaction, then removing tetrahydrofuran by using a rotary evaporator, transferring into deionized water, and drying to obtain a boron nitride nano-sheet; drying to obtain a modified boron nitride nanosheet; (2) dispersing carbon nanotubes in deionized water, stirring and carrying out ultrasonic treatment, adding the modified boron nitride nanosheets, and then carrying out freeze orientation treatment and freeze drying treatment to obtain a porous foamed composite heat-conducting filler; and (3) carrying out melt blending on the composite heat-conducting filler and polyethylene glycol terephthalate, and carrying out hot press molding to finally prepare the modified high-heat-conductivity polymer. According to the invention, the composite heat-conducting filler improves the interfacial compatibility and dispersity with a polymer matrix, and reduces the interfacial thermal resistance of the composite material, so that the modified polymer has good application in the aspect of heat dissipation of electronic equipment.

The invention discloses a seed layer induced FeCoNiCuMo high-entropy alloy nanocage electrocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing and reacting iron, cobalt and nickel precursors to prepare a FeCoNi nanocage catalyst as a seed layer; adding copper salt and molybdate into the seed layer solution, carrying out ultrasonic mixing, adding a pH regulator and a reducing agent, carrying out ultrasonic treatment, putting the mixed solution into liquid nitrogen, cooling, carrying out primary nucleation, naturally unfreezing, standing for nucleation, cleaning, and freeze-drying to obtain the high-entropy alloy nanocage electrocatalyst. The catalyst is used for preparing urea through CO2 and NO3 <-> electro-catalysis, can effectively adjust the matching of CO2 and NO3 <-> reaction kinetics, and has extremely high Faraday efficiency and yield for synthesizing urea through C-N coupling.

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 discloses preparation and application of antioxidative, anti-inflammatory and hypoglycemic lactoferrin peptide, and belongs to the field of food science and nutriology. According to the invention, lactoferrin is used as a raw material, hydrolysis is carried out by using a composite enzymatic hydrolysis method, and the molecular weight is obtained by ultrafiltration; the preparation method comprises the following steps: preparing a component of antioxidant, anti-inflammatory and hypoglycemic peptide from the active peptide YLSW (Tyr-Leu-Ser-Trp), carrying out freeze drying on the component to obtain peptide powder rich in antioxidant, anti-inflammatory and hypoglycemic peptides, identifying peptide fragments contained in the peptide powder by utilizing an LC-MS / MS technology, and screening out the active peptide YLSW (Tyr-Leu-Ser-Trp) with antioxidant, anti-inflammatory and hypoglycemic triple functions. The active peptide is added into the product to obtain the antioxidant, anti-inflammatory and hypoglycemic functional product.

The invention discloses a multifunctional composite material for mineralizing and storing CO2 based on fly ash and a preparation method of the multifunctional composite material. The material is prepared from high-activity fly ash subjected to plasma activation treatment, a nanoscale metal oxide catalyst, a metal organic framework, a functional organic ligand, an intelligent pH regulator, a solid suspension stabilizer and water. The preparation method comprises the steps of suspension preparation, high-pressure CO2 mineralization reaction in a reaction kettle, centrifugal separation and freeze drying treatment. The method is simple, the raw material cost is low, the prepared multifunctional composite material not only can remarkably improve the storage efficiency of CO2, but also can ensure that a stable carbonate product is generated, and the carbonate product has high specific surface area and excellent chemical stability, can be widely applied to the fields of high-end building materials, energy storage materials and fine chemical engineering, and has wide application prospects. And meanwhile, the high-added-value utilization of the industrial by-product fly ash is realized, and the dual purposes of reducing carbon emission and improving the utilization rate of solid wastes are achieved.

The invention belongs to the technical field of super-hydrophobic materials, and particularly relates to a preparation method and application of magnetic response multifunctional super-hydrophobic biomass aerogel. The super-hydrophobic PDMS-coated CMIL-101 / CS aerogel is prepared by combining chitosan (CS), a magnetic porous carbon material (CMIL-101) and polydimethylsiloxane (PDMS) through a freeze drying technology, so that efficient oil-water separation and organic pollutant microplastic removal are realized. The aerogel utilizes magnetic response and photo-thermal characteristics, promotes oil adsorption and treats high-viscosity oil in a magnetic field, simplifies the purification process, and has important application value for water body remediation.

The invention discloses a mixed gas-imitating gel fiber as well as a preparation method and application thereof, and belongs to the technical field of fiber materials. The mixed gas-imitating gel fiber is prepared from the following components: cellulose dispersion liquid, a silane coupling agent and viscose in a mass ratio of (1-3): (0.2-0.8): (5-10), comprising the following steps: adding sodium hydroxide into a cellulose dispersion liquid, adjusting the pH value to be alkaline, adding viscose and a silane coupling agent, and carrying out ultrasonic stirring to prepare a mixed spinning solution; the mixed spinning solution is extruded into a coagulating bath through a wet spinning device to be drafted, wet fibers are obtained, and the mixed gas-imitating gel fibers are obtained after freeze drying. The aerogel fiber disclosed by the invention has low heat conductivity coefficient, high mechanical strength and extreme temperature resistance, can solve the problem that the densification and porosity of a traditional fiber structure are difficult to balance, and effectively expands the application prospect of the aerogel fiber in the fields of cold protection, warm keeping and the like.

The invention discloses an anti-EV71 virus activity buthus martensii toxin polypeptide as well as a preparation method and application thereof, and belongs to the technical field of antiviral preparations. A scorpion tail electricity-saving stimulation method is adopted to obtain crude scorpion venom, and centrifugation and freeze drying are performed to obtain scorpion venom freeze-dried powder; dissolving the scorpion toxin freeze-dried powder, filtering, removing sediment, carrying out ultrafiltration centrifugation, and separating to obtain the anti-EV71 virus activity scorpion toxin polypeptide. According to the present invention, the scorpion martensii toxin polypeptides S-I (lt; 3kDa) and S-II (3-10 kDa) obtained from the scorpion martensii have good EV71 virus resistance; under the same concentration, the relative molecular mass is lt; compared with the prior art, the scorpion margaritae toxin polypeptide with the molecular weight of 3kDa has better anti-EV71 virus activity, has no toxic effect on cells, has the potential of being used as an anti-EV71 virus drug, and provides a theoretical basis for biomedical research and clinical application of the scorpion margaritae toxin polypeptide.

The invention provides a carbon nanotube / polyvinyl alcohol hydrogel and a preparation method and application thereof, and belongs to the technical field of composite materials and flexible electron cross materials. Cellulose nanofibers and multi-walled carbon nanotubes are dispersed in deionized water to obtain dispersion liquid; uniformly mixing a polyvinyl alcohol solution and the dispersion liquid to obtain a mixed solution; carrying out oriented freezing forming on the mixed solution, and then freeze-drying the mixed solution to obtain an aerogel sample; performing hot pressing on the aerogel sample to obtain a thin film material; and swelling and balancing the film material in deionized water to obtain the carbon nanotube / polyvinyl alcohol hydrogel. According to the invention, collaborative optimization of conductive network continuity, interface bonding strength and energy dissipation capability is realized, so that high conductivity, high stress and obdurability are considered, and the material is endowed with multi-dimensional strain sensing capability and signal stability; and a new idea is provided for realizing effective balance between high conductivity and excellent mechanical properties of the hydrogel material.

The invention belongs to the technical field of electrochemical energy storage, and relates to a nitrogen-doped MXene loaded VCo double-monatomic catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: adding a nitrogen-containing precursor into at least one layer of MXene suspension, and uniformly stirring to obtain a suspension; respectively dissolving a cobalt-containing compound and a vanadium-containing compound in water to prepare a cobalt-containing compound solution and a vanadium-containing compound solution, adding the cobalt-containing compound solution and the vanadium-containing compound solution into the suspension, and performing stirring, ultrasonic treatment and crushing to obtain a mixed solution; freeze-drying the mixed solution to obtain a precursor; and carrying out heat treatment on the precursor, and washing, centrifuging and drying the obtained powder to obtain the nitrogen-doped MXene loaded VCo double-monatomic catalyst. According to the invention, VCo double monatomic atoms are anchored on the surface of the few-layer MXene, so that the MXene serving as a sulfur carrier of the room-temperature sodium-sulfur battery can effectively adsorb and catalyze conversion of sodium polysulfide, and the room-temperature sodium-sulfur battery with excellent cycle life and capacity is obtained.

The invention discloses a Janus wound dressing with antibacterial and tissue repair promoting functions and a preparation method of the Janus wound dressing, belongs to the technical field of wound dressings, and aims to realize antibacterial, tissue repair promoting and moist wound healing microenvironment through freeze drying and electrostatic spinning technologies. Polycaprolactone (PCL), bioactive glass (BG) and curcumin Cur are used for preparing a hydrophobic inner layer capable of promoting tissue repair, methacrylated gelatin GelMA is used for preparing a hydrophilic outer layer with moisturizing performance, and the PCL-BG-Cur / GelMA composite wound dressing with antibacterial, moisturizing and repair promoting functions is constructed. Animal experiment results show that the dressing loaded with curcumin Cur and bioactive glass BG has multiple functions of synergistic antibiosis, moisturizing and the like, the result shows that the prepared dressing has the performance of promoting epithelization, collagen deposition, new hair follicle formation and the like, and the dressing has a considerable application prospect in the aspect of rapid wound repair.

The preparation method of the composite soybean protein gel comprises the following steps: adjusting the pH value of an egg white protein solution, carrying out heat preservation, adding protein glutaminase to carry out hydrolysis reaction, centrifuging, collecting supernate, and freeze-drying to obtain deamidated egg white protein; adding TG enzyme into the soybean protein isolate and deamidated egg white protein solution for enzymatic cross-linking reaction, centrifuging after enzyme deactivation, collecting supernate, and freeze-drying to obtain compound protein powder; dissolving the composite protein powder in water, stirring, and heating to form composite soybean protein gel; according to the preparation method disclosed by the invention, glutamine in the egg white protein is hydrolyzed by using the protein glutaminase, so that only the site of lysine is reserved, and then TG enzyme treatment is performed, so that the crosslinking of the egg white protein is avoided, and the content of disulfide bonds in the soybean protein is increased, thereby remarkably improving the gel strength and compression resistance of the composite soybean protein thermal gel.

The invention discloses liquid crystal polyimide aerogel with excellent shape memory performance and a preparation method of the liquid crystal polyimide aerogel, and belongs to the field of polymer aerogel materials. According to the liquid crystal polyimide aerogel with the excellent shape memory performance, the shape fixing rate is larger than or equal to 99%, and the shape recovery rate is larger than or equal to 97%; the heat conductivity at the room temperature is larger than or equal to 0.09 W m <-1 > K <-1 >; specifically, liquid crystal diamine, flexible diamine, a liquid crystal dianhydride monomer and a thermal curing agent are subjected to a reaction and solvent replacement, and polyamide acid dry filaments are obtained; and forming an aqueous solution from the dry polyamide acid filaments, injecting the aqueous solution into a silica gel mold, carrying out directional freezing casting on a customized freezing circulating device with a copper plate at the top, and carrying out freeze drying, thermal imidization and curing after molding, so as to obtain the liquid crystal polyimide aerogel with excellent shape memory performance.

The invention discloses a preparation method of a salt-resistant polyurethane sponge evaporator for a photo-thermal interface, which comprises the following steps: taking polyurethane sponge as a support framework, taking polyvinyl alcohol as a precursor solution, adding carbon black and PEDOT: PSS (poly (3, 4-ethylenedioxythiophene): poly (styrenesulfonate)) into the precursor solution as photo-thermal materials, and synthesizing the salt-resistant polyurethane sponge evaporator by an extrusion thermal crosslinking freeze-drying method. According to the obtained evaporator, the excellent photothermal conversion performance of carbon black / PEDOT: PSS and a porous framework structure mainly comprising polyurethane / polyvinyl alcohol are fully utilized, the water absorption, the mechanical performance and the photothermal conversion efficiency of the evaporator are effectively improved, the heat conductivity is reduced, it is guaranteed that salt crystals do not appear inside and on the surface of the evaporator while efficient interface evaporation is achieved, and the service life of the evaporator is prolonged. The device can be widely applied to solar interface evaporation in saline water, actual seawater or high-salinity wastewater so as to obtain clean water resources.

The invention discloses a Ca / Mg-based modified biochar material and a preparation method and application thereof, and the preparation method comprises the following steps: pretreatment: drying a biomass material shaddock peel, crushing, sieving, washing and drying, then carrying out acid leaching activation, washing again and drying to obtain high-activity biomass powder for later use; dipping modification: fully mixing the high-activity biomass powder obtained in the pretreatment step with CaO and MgO, adding distilled water, dipping under heating and stirring conditions, then carrying out solid-liquid separation, washing a filter cake for multiple times, freeze-drying, and sieving to obtain an intermediate product; the intermediate product is calcined, naturally cooled, washed and dried, and the Ca / Mg-based modified bimetallic modified charcoal material is obtained and can be applied to adsorption of phosphate in a wastewater solution as an adsorbent. The preparation method is simple, the raw materials are easy to obtain, the cost is low, the material stability is good, the pH adaptability is good, the adsorption effect is good, and the method is suitable for water environments with more complex pollution factors.

The invention discloses an ionic liquid modified polyimide nanofiber film and an air purification filter screen based on the ionic liquid modified polyimide nanofiber film, and belongs to the technical field of film filtering materials. The preparation method comprises the following steps: firstly, selecting a diamine monomer and a dianhydride monomer to carry out low-temperature polycondensation reaction, and then carrying out solvent replacement and freeze drying to obtain polyamide acid powder; dissolving the powder to obtain a polyamide acid spinning solution, preparing an ionic liquid / polyamide acid spinning solution on the basis, and carrying out electrostatic spinning to obtain an ionic liquid / polyamide acid nanofiber membrane; and finally, carrying out high-temperature thermal imidization treatment to prepare the ionic liquid / polyimide nanofiber membrane. The method is simple and efficient, the problems of low resistance, high pressure drop and the like of a traditional nanofiber film in air filtration are solved, development and application of the nanofiber film in the field of air filtration are further widened, and the nanofiber film has important scientific significance and application value in the fields of high-temperature filtration, gas adsorption and the like.

The invention provides modified aluminum nitride and a preparation method thereof, and the preparation method comprises the following steps: grinding a mixed material comprising aluminum nitride powder, a dispersing agent and an alcohol solvent to obtain nanoscale aluminum nitride powder with the particle size of 50-400 nm; the nanoscale aluminum nitride powder is subjected to first freeze drying treatment, and freeze-dried aluminum nitride powder is obtained; and mixing a solution containing dopamine with the freeze-dried aluminum nitride powder, and then carrying out second freeze-drying treatment to obtain the modified aluminum nitride. The method is helpful for improving the hydrolysis resistance of aluminum nitride.

The invention discloses a preparation method of a fly ash-Al-MOF material loaded with sodium percarbonate and acid-containing ferrous sulfate, which comprises the following steps: carrying out heat treatment on fly ash, cooling, adding into a sulfuric acid solution, stirring and mixing, carrying out solid-liquid separation, adding sodium hydroxide into a liquid product to adjust the pH value to 4.5-6 to obtain an aluminum hydroxide precipitate, washing and roasting to obtain aluminum oxide, and drying to obtain the fly ash-Al-MOF material loaded with sodium percarbonate and acid-containing ferrous sulfate. The preparation method comprises the following steps: mixing fly ash-Al-MOF with a sulfuric acid solution to obtain an aluminum sulfate solution, uniformly mixing the aluminum sulfate solution with a phthalic acid solution, carrying out solid-liquid separation, washing a solid product, carrying out freeze drying to obtain fly ash-Al-MOF, and respectively loading sodium percarbonate and acid-containing ferrous sulfate on the fly ash-Al-MOF to obtain fly ash-Al-MOF loaded with sodium percarbonate and fly ash-Al-MOF loaded with acid-containing ferrous sulfate; and uniformly mixing the two components to obtain a finished product. Compared with the existing method, the material prepared by the invention can realize long-term, stable, effective and environment-friendly remediation of the organic polluted soil, and the remediation efficiency is high.

The invention belongs to the technical field of gel materials, and particularly relates to a high-performance water-swelling acrylic acid-based material and a preparation method thereof. Comprising the following steps: (1) modifying graphene by adopting a silane coupling agent containing unsaturated double bonds to prepare a modified graphene dispersion liquid; (2) sequentially adding acrylic acid, an acrylamide monomer and a cross-linking agent into the modified graphene dispersion liquid, then adding an initiator, and reacting to obtain a gel mixed solution; and (3) freeze-drying the gel mixed solution to obtain the high-performance water-swelling acrylic acid-based material. The gel material is uniform in pore structure and high in mechanical strength. Physical adsorption can be carried out by taking Van der Waals force or electrostatic attraction force as adsorption driving force through a pore structure, and chemical adsorption can also be carried out by taking chemical bond force or hydrogen bond interaction as adsorption driving force through functional groups on the graphene and the acrylic polymer, so that organic pollutants such as cationic dyes and the like can be effectively and quickly removed.