80results about How to "Change the pore structure" patented technology

The invention discloses a modified building residue baking-free brick. The modified building residue baking-free brick is prepared from, by mass, 65 to 75% of building residue, 10 to 15% of sand, 5 to 15% of cement, and 2 to 5% of industrial lime. The modified building residue baking-free brick is prepared via following steps: 1) building residue generated in subway construction processes is subjected to simple ball milling so as to obtain building residue powder; 2) the ingredients above are weighed according to the ratio above, and water-solid ratio is controlled to be 0.20 to 0.24; 3) cement, lime, gypsum, and sand are uniformly mixed with the building residue powder, water is added for uniform mixing, an obtained mixed material is subjected to extrusion forming, and curing under natural conditions for 3 to 7 days, is delivered into a drying oven, and is dried to be constant in weight at 40 to 60 DEG C so as to obtain the modified building residue baking-free brick. The modified building residue baking-free brick is cheap; a large amount of building residue can be recycled; environmental pollution and soil waste are reduced; compressive strength is high; water resistance is excellent; the modified building residue baking-free brick is capable of satisfying performance requirements of building bricks, and can be used for replacing sintering clay bricks.

The invention relates to a modified bamboo-carbon product and the manufacturing method. In detail, it is the porous TiO2 bamboo-carbon product with Ag on the surface and high specific surface area, notable photocatalysis and antibacterial performances and the manufacturing method. The porous TiO2 modified bamboo-carbon with Ag on the surface comprises pretreated bamboo-carbon material and TiO2 nanometer sol doped pore-making agent Ag / N filled in bamboo-carbon duct or vascular bundle. The TiO2 nanometer sol doped pore-making agent Ag / N comprises TiO2 sol particle, pore-making agent, nitrogen doped component and Ag+. No only the invention changes the distribution of pore channels but also pore channels can not be jammed. So it can improve bamboo-carbon specific surface area in effect and increases absorption and the concentration of anion. At the same time, when there is no light source, the abundant Ag on the surface is made use of so that the bamboo-carbon is provided with permanent antibacterial performance. The invention provides important bamboo-carbon material with high quality for develop the bamboo-carbon application area.

The invention relates to the technical field of water treatment, and concretely relates to a catalytic ozonation catalyst as well as a preparation method and application thereof. The preparation method of the catalytic ozonation catalyst comprises the following steps of grinding raw material coal, adding active components, forming, carbonizing and activating to obtain the catalytic ozonation catalyst. The active components are prepared from one or more of a transition metal compound, a rare earth metal compound, an alkali metal compound and an alkaline-earth metal compound. According to the preparation method, an activation reaction mechanism is changed, so that a pore structure of the catalyst is changed, and a double-pore distribution structure with coexistence of mesopores and micropores is prepared; the catalyst has high catalytic activity, and the removal rate of COD (Chemical Oxygen Demand) can be greatly improved; the catalyst is developed in mesopores, larger in pore volume, and beneficial to enabling pollutants to enter pores of the catalyst so as to fully contact with an active center; the micropores exist at the same time, so that the catalytic activity can be effectively improved.

The invention provides a mercaptan removal catalyst as well as a preparation method and application thereof. The catalyst comprises a carrier, an active component and an oxidizing auxiliary agent heteropoly acid, wherein the carrier is composed of alumina and a rare earth element-modified molecular sieve; the active component is one or more of group IA, IIA, IB, IIB, VIIB or VIII metal oxide. The catalyst provided by the invention can change a pore structure and the adsorption performance of the molecular sieve by modifying the molecular sieve, and enhance the chemical adsorption capacity of the catalyst carrier to the mercaptan so as to be more favorable for adsorbing the mercaptan; meanwhile, the catalyst provided by the invention oxidizes the mercaptan into corresponding disulfide by using the strong oxidizing property of the heteropoly acid and then is adsorbed by the composite carrier, thereby allowing the mercaptan removal catalyst provided by the invention to remove the mercaptan without hydrogenation while reducing the total sulfur content, and achieving the purpose of thoroughly and effectively removing the mercaptan.

The invention discloses a method of artificial construction of root holes in wetland, and the method comprises: in the primary stage of wetland construction, plant straws are imbedded in the sublayer of wetland soil; aquatic plants or wetland plants which can form natural root holes are planted in the wetland bed imbedded with plant straw; in the wetland, artificial root holes form after the plant straw decays; and water flow is filtered from the root hole system in the wetland bed due to the presence of a hydraulic head difference between the two sides of the wetland bed. In the primary stage of artificial wetland construction, the method can accelerate the development of biological macro-pores in soil; strong transverse / lateral filter network is formed and promoted by artificial work, and moisture is rapidly conducted to internal part of the wetland soil, thus the processing efficiency of wetland is greatly raised; the self-renewal of the substrate packing media of the wetland is achieved by continuously updating the wetland root holes and the transition between artificial root holes and natural root holes; and the disadvantage that obstruction is easy to happen in packing media for common artificial wetland is overcome, and the method provides a good foundation for the healthy substitution of wetland.

The invention discloses a composite sponge using cellulose and soybean protein as main raw materials and a preparation method, in which cellulose and soybean protein solves in sodium hydroxide / urea aqueous solution, and composite sponge is prepared by freeze drying and vacuum drying method. The composite material with different microstructure and performance can be prepared by changing the proportion of cellulose and soybean protein and through crosslink and modification of glutaric dialdehyde and epoxy chloropropane. The implant experiments in the body of animals and the in vitro cell culture experiments show that the composite material has good biological compatibility. The method is simple and applicable, the raw material of which has rich sources, and the method is hopeful to prepare biodegradable material for medicine from natural polymer with application foreground.

The invention discloses a construction method of a bridge pile foundation in a mountainous area. The construction method comprises the following steps: (1) staking out in survey, namely locating position of the pile foundation; (2) digging a hole, namely enlarging hole on the bottom rock of a pile hole after digging the pile hole to form an enlarge hole cavity; (3) placing a steel reinforcement cage and an enlarged steel reinforcement cage, namely placing a main steel reinforcement cage in the pile hole and placing the enlarged steel reinforcement cage in the enlarged hole cavity; (4) pouring concrete, namely pouring concrete into the pile hole by adopting a guide pipe method and manufacturing a bearing platform; and (5) arranging anchor cables, namely drilling around the pile foundation, mounting a vertical anchor cable and a horizontal anchor cable, grouting by adopting a hole bottom grout returning method, and punching the vertical anchor cable and the horizontal anchor cable into the rock by passing through the soil layer. The construction method is simple; the pile foundation bearing capability is strong.

The invention discloses a preparation method for a proton exchange membrane fuel cell catalyst. The adoption of a surfactant and a stabilizer is avoided, the preparation method is easy to operate, safe and convenient, and the preparation efficiency is greatly improved; acid is added as a precipitant, so that the precipitation time of the catalyst is greatly shortened, and the process efficiency is improved; a drying process of the catalyst is rapidly finished by a spray drying technology, and materials sprayed in the drying process are instantaneously heated by high temperature only when being sprayed into spray particles, so that the phenomenon of agglomeration of the catalyst is reduced, and the electrochemical activity of the platinum-carbon catalyst is kept high after the catalyst is dried; moreover, by the spray drying technology, the preparation time of the catalyst is further reduced, and the preparation method is easy to realize industrial production, and has broad market prospect.

The invention discloses a preparation method for moisture absorbing and keeping type packing and the application of the packing in the production of reconstituted tobaccos by using a paper-making method. According to the invention, kaolin is subjected to high-temperature calcining and alkaline solution treatment so as to obtain modified kaolin; and then, the modified kaolin is wrapped with starch so as to obtain the moisture absorbing and keeping type packing, wherein the moisture absorbing and keeping type packing is of a porous structure with a large specific surface area and a high porosity, and the surface of the packing has hydrophilic groups. The moisture absorbing and keeping type packing as packing for the production of reconstituted tobaccos by using an existing paper-making method is used for wetly manufacturing paper with pulp and / or coating. According to the invention, through the scientifically treated and appropriately applied packing, the moisture absorbing and keeping performance of reconstituted tobaccos is improved, and the gap between the moisture absorbing and keeping performances of reconstituted tobaccos and natural tobaccos is narrowed; and problems of crushing and piece deviating and the like generally existing in the cut tobacco manufacturing of reconstituted tobaccos by using a paper-making method are solved.

The invention discloses synthesis of a porous ZSM-5 zeolite and gamma-Al2O3 composite material and preparation of a hydrodesulfurization catalyst and relates to the technical field of composite materials and the field of hydrodesulfurization catalysts. The composite material is roasted for 3-8 h at the temperature of 450-600 DEG C, and has the following properties that the content of porous ZSM-5 zeolite is 5-95 wt.%, the content of gamma-Al2O3 is 5-95 wt.%, the specific surface area is 400-600 m<2>.g1, the mesopore volume is 0.40-0.85 cm<3>.g1, and the micropore volume is 0.06-0.15 cm<3>. g1. The composite material has multiple stages of porous structures, good hydrothermal stability, high mechanical strength and weak interaction with loaded metal species, changes the existence state of the metal species and promotes reducing and vulcanizing of the metal species, multiple layers of high-activity molybdenum sulfide or tungsten sulfide active phases are easily formed on the composite material, and the hydrodesulfurization performance of the metal sulfide catalyst is improved.

The invention discloses a hydroxyethyl cellulose / soybean protein composite sponge with a water sensitive shape memory function and a preparing method of the composite sponge. The preparing method comprises the steps of firstly dissolving hydroxyethyl cellulose and soybean protein into deionized water and a weak NaOH solution respectively, and then preparing the composite sponge through freezing and a vacuum drying method. By changing the proportion of hydroxyethyl cellulose and soybean protein or conducting cross-linking modification on epichlorohydrin or ethylene glycol diglycidyl ether, composite sponge materials with different microstructures and properties can be obtained. The hydroxyethyl cellulose / soybean protein composite sponge has water sensitive type memory function, and the shape and structure before compression can be restored. A cell culture experiments in vitro and a blood compatibility experiment show that the composite material has good compatibility to cell, blood and tissue. The method is simple and practical, raw materials are wide in source, and a natural macromolecule biological medical material with an application prospect can be expected to be shaped.

The invention discloses a preparation method of high-performance forward osmosis membrane and relates to a method of membrane modification. The preparation method aims at solving the problem that the salt back-mixing flux of existing sea water desalination forward osmosis membrane is high. The method comprises the following steps: 1, mixing a membrane forming polymer, an addition agent and a solvent to prepare membrane casting liquid, and forming membrane by a phase inversion method; 2, putting the membrane in hot water bath to dip, then putting the membrane in an organic solution to dip, using deionized water to wash, putting the membrane in glycerol aqueous solution to dip, after taking the membrane out, drying the membrane by airing, storing the membrane in a drying tank. According to the preparation method of the high-performance forward osmosis membrane, common chemical reagents are used for preparing a macromolecule permeable membrane material, so that under the condition of keeping water flux not to be reduced (even if the water flux is increased), the salt back-mixing flux is lowered, the selectivity of forward osmosis technology to ions (or molecules) in water is effectively improved, and the preparation method has very important practical significance to the practical application of the forward osmosis technology. Meanwhile, the preparation method has advantages of being simple in process, convenient to operate, low in reagent price and high in repeating utilization rate.

The invention discloses a preparation method of organic modification biochar for treating heavy metal cadmium in wastewater. The preparation method comprises: (a) preparation of wheat straw biochar: carrying out air-drying on wheat straw, crushing, sieving, carbonizing the crushed wheat straw, naturally cooling to a room temperature after the carbonization, washing with an acid, filtering, washingwith distilled water to achieve a neutral state, and drying to achieve a constant weight to obtain wheat straw biochar; and (b) preparation of organic modification biochar: soaking the wheat straw biochar prepared in the step (a) in a chitosan solution, performing ultrasonic wave treatment after mixing and stirring, adding the chitosan-biochar suspension into an alkaline solution in a dropwise manner by using an injector, standing, filtering, washing with distilled water to achieve a neutral state, and drying to achieve constant weight so as to obtain the organic modification biochar. According to the present invention, by using organic modification, the advantages of two adsorbents of chitosan and biochar are combined, such that the adsorption efficiency of the biochar on cadmium in wastewater is greatly improved.

The invention relates to a preparation method of a hydrogen bond acceptor oxygen atom-rich super-crosslinked polymer and an application of the super-crosslinked polymer. The preparation method comprises the following steps: (1) preparation of a precursor polymer: carrying out a nucleophilic substitution reaction process on chloromethylated polystyrene and a phenol compound in an alkaline environment, and introducing a monomer containing hydrogen bond acceptor oxygen atoms into a polymer skeleton, and (2) preparation of a super-crosslinked polymer: carrying out a Friedel-Crafts alkylation reaction on the precursor polymer prepared in the step (1) and an external crosslinking agent under the catalysis of Lewis acid, and weaving a precursor polymer skeleton. The super-crosslinked polymer prepared by the method can realize regulation and control of the pore structure size, has a high-selectivity adsorption effect on aromatic organic compounds with specific molecular sizes, is easy to eluteafter adsorption, can be repeatedly used, and can be widely applied to the fields of chemical analysis, drug separation and purification, environmental pollution treatment and the like.

The invention discloses cigarette paper with a variable diffusion rate and a pore structure and application thereof. The cigarette paper is prepared by adding an additive compounded by a combustion improver and a promoter into common cigarette paper. After the cigarette paper is made into cigarettes, the releasing amount of carbon monoxide in mainstream smoke can be reduced effectively while the sensory quality of the smoke of the cigarettes is not influenced; the cigarette paper is simple in preparation method and low in cost, and can be produced industrially.

The invention discloses a supergravity method metal organic ligand doped amino acid composite material and a preparation method thereof. The method comprises the following steps: firstly preparing zirconium chloride solution denoted as solution A; preparing terephthalic acid solution, dissolving amino acid into the terephthalic acid solution, and denoting the mixed solution as solution B; feedingthe solution A into the solution B, meanwhile performing magnetic stirring, feeding glacial acetic acid into the mixed solution, transferring the mixed solution into a centrifuge tube, controlling thetemperature to be 20 to 70 DEG C, and ensuring that reaction is performed for 20 to 40min at ultrafast rotate speed of 8000 to 10000rmp / min and 500 to 1000W, so as to obtain the supergravity method metal organic ligand doped amino acid composite material. The material has the advantages that compared with a conventional crystal particle synthesized hydrothermally, the crystal particle of the material is smaller, the particle uniformity is high, and the BET specific surface area is high and is approximately 1400 to 1600m<2> / g. Meanwhile, the advantage of controllable amino acid doping ratio can be realized, and further the adsorption capacity and selectivity to dyes by the material is improved.

The invention discloses a preparation method for polyacrylic acid water-absorbent resin, which comprises the following steps: (1) under the condition of ice-water bath, dripping a NaOH aqueous solution into acrylic acid to prepare a sodium acrylate aqueous solution of which the neutralization degree is 50-70%; (2) taking part of the sodium acrylate aqueous solution acquired in step (1), adding xylogen therein, heating the mixture to 50-70 DEG C in nitrogen atmosphere under the condition of stirring, adding potassium peroxodisulfate, when refluxing reaction time is half of the total time, adding N'N-methylene bisacrylamide and the remaining sodium acrylate aqueous solution, and continuing refluxing reaction in the rest of time, whereinthe total time of the refluxing reaction is 20-80min; (3) pouring a reactant acquired in step (2) into ethyl alcohol, dipping, taking out solid resin, and using ethyl alcohol to wash the solid resin until eluate is colorless; and (4) drying and smashing the washed resin, extracting resin powder with acetone to remove the homopolymer in the resin, refluxing for 18-24h, and then carrying out vacuum drying to obtain the polyacrylic acid water-absorbent resin.

The invention discloses a preparation method for a mesoporous electrode. The preparation method is characterized by comprising the following steps of: 1, pre-treating active carbon: grinding active carbon particles into powder with the particle size of 70 to 1,000 meshes, and then washing by using water and drying; 2, canning the active carbon: putting the pretreated active carbon powder into a container, degassing for 1 to 2 hours by vacuumizing, and then sealing the container by welding; 3, performing hot isostatic pressing treatment: performing hot isostatic pressing on the container for 0.5 to 2 hours in a hot isostatic press at a temperature of between 500 and 2,000 DEG C and a pressure of between 500 and 25,000 psi; 4, cooling the container at a speed of 100 to 500 DEG C per hour; and 5, mechanically processing a mesoporous carbon electrode which is molded by hot isostatic pressing into an electrode slice with a required shape. The mesoporous electrode is applied to equipment for electro-adsorption desalination and electrolytic water treatment.

The invention relates to a protein type halogen resistant combustible gas combustion catalyst and a preparation method and application thereof. The protein type halogen resistant combustible gas combustion catalyst is a core-shell structure catalyst formed by combining one or more of a supported Pt catalyst, a supported Pd catalyst and a supported Rh catalyst. The preparation method comprises the following steps: supporting gamma-Al2O3 doped with CeO2, ZrO2, La2O3, SiO2, TiO2 and W2O3 on a ceramic honeycomb carrier or a metal honeycomb carrier in the form of a coating; and then impregnating active components on the surface of a catalytic coating; and finally, coating the surface of a catalyst with a microporous or mesoporous oxide coating to prepare the protein type integral structure catalyst. The protein type halogen resistant combustible gas combustion catalyst provided by the invention has the advantages of high CO, methane and VOCs combustion activity, excellent hydrothermal stability and excellent halogen resistance and is suitable for the field of gas water heater exhaust purification, chlorine containing VOCs gas catalytic removal, automotive exhaust purification and so on.

A filter medium is provided. A filter medium according to an embodiment of the present invention comprises: a fiber web layer of a three-dimensional network structure including nanofiber; and a hydrophilic coating layer which covers at least a part of the outer surface of the nanofiber. According to this, a flow rate can be remarkably increased due to the improved hydrophilicity of the filter medium. Also, as the improved hydrophilicity is maintained for a long period of time, the lifespan can be remarkably prolonged. Furthermore, since the modification of a porous structure of the filter medium is minimized during the process of hydrophilization so that the initially designed physical properties of the filter medium can be exhibited in its entirety, the filter medium having chemical resistance, excellent water permeability and durability can be variously applied in the water treatment field.

The invention discloses real-time hole forming cigarette paper based on metal organic frame (MOF) materials and application thereof. The real-time hole forming cigarette paper is mainly used for reducing the CO and tar releasing amount of mainstream smoke without producing negative effects on the smoking quality of a cigarette. The real-time hole forming cigarette paper is characterized in that the MOF materials are used in the cigarette paper producing process; in the cigarette paper burning process, the MOF materials can produce more microcellular structures after being heated and decomposed, the diffusion rate of the part, near a carbonization line, of the cigarette paper in the cigarette burning process is obviously increased, and the hole structure of the cigarette paper is changed. The CO and tar releasing amount of the mainstream smoke is reduced. By means of the cigarette paper, the CO releasing amount of the mainstream smoke can be reduced by 15 percent or more, and the tar releasing amount can be reduced by 4 percent to 8 percent. The cigarette paper is simple in preparing method, cost is low, and industrial production can be achieved.

The invention discloses mesoporous petroleum-coke-based activated carbon and a preparation method thereof. The preparation method of the mesoporous petroleum-coke-based activated carbon comprises thefollowing steps: 1) smashing, grinding and screening a petroleum coke raw material to obtain petroleum coke powder; 2) mixing the petroleum coke powder with ionic liquid, fully dipping, filtering, recycling filtrate, washing a solid product to a neutral state by water and drying to obtain pretreated petroleum coke powder; (3) mixing the pretreated petroleum coke powder with an activator, putting in a sealed type furnace body, introducing protection gas, activating and then water washing, acid washing, water washing and drying an activated product to obtain the mesoporous petroleum-coke-based activated carbon. According to the preparation method disclosed by the invention, ionic liquid dipping is utilized to pretreat the petroleum coke; thus, hole structures and microcrystalline structuresof the petroleum coke are changed, dispersion of an KOH activator in the petroleum coke is beneficiated, and a mesoporous proportion in the prepared petroleum-coke-based activated carbon is high.

The invention discloses marine concrete with high freeze thawing resistance as well as a preparation method thereof and relates to the technical field of the marine concrete. The marine concrete withhigh freeze thawing resistance comprises a component A and a component B, wherein the component A comprises Portland cement, broken stones, yellow sand and a water-reducing agent; and the component Bis silicon carbide modified water glass. The preparation method comprises the following steps: preparing the component A according to proportion and throwing the component A into a stirring cabin to perform complete stirring; weighing water glass and silicon carbide powder, throwing the water glass and the silicon carbide powder into a reaction cabin, performing complete reaction under the water-bath condition to obtain the component A, and completely stirring the component A and the component B for 0.5 to 1 hour under the normal-temperature condition to obtain the final product. The marine concrete with high freeze thawing resistance has the advantage of improving the freeze thawing resistance of the marine concrete; in addition, the preparation method has the advantage of improving the compressive strength of the marine concrete with high freeze thawing resistance.

The invention discloses a preparation method and application of a nitrogen-phosphorus double-doped graded porous carbon material, belongs to the technical field of battery positive electrode materialsand solves technical problems of complex process and difficulty in control in an existing method for preparing a heteroatom-doped graded porous carbon material. The method is characterized in that chloride inorganic salt is introduced into polyaniline-phytic acid aerogel with a three-dimensional connected framework, acid pickling and water washing are carried out after pyrolysis, soluble substances in the material are removed, a pore structure of the carbon material is changed, moreover, electrical conductivity of the carbon material is improved, and stability of the sulfur / carbon composite material in the battery circulation process is guaranteed. The preparation method disclosed by the invention is simple and feasible in operation process, suitable for mass production, relatively low incost and high in material preparation method repeatability. The preparation method is suitable for the sulfur anode carrier material of the lithium-sulfur battery.

The invention relates to the field of concrete, and particularly discloses anti-cracking recycled concrete and a preparation method thereof. A waterproof and corrosion-resistant wood board for a laboratory fume hood is prepared from 55-60 parts of cement, 20-30 parts of water, 25-30 parts of fly ash, 0.2-0.4 parts of cellulose ether, 6-8 parts of entangled fibers, 3-5 parts of SiO2 aerogel particles and 80-100 parts of recycled aggregate; The entangled fibers are prepared by mixing wollastonite fibers and polypropylene fibers according to a mass ratio of 1: (6-8). The preparation method comprises the following preparation steps of: S1, coating modification of recycled aggregate; S2, premixing treatment; and S3, mixing again. According to the recycled concrete, wollastonite fibers and polypropylene fibers are entangled and compounded and are mutually lapped to form a three-dimensional network, the three-dimensional network and a concrete aggregate structure jointly resist the action of shear force, and the anti-cracking strength of the recycled concrete material is improved.

The invention discloses real-time hole forming cigarette paper and application thereof, and is mainly used for reducing the HCN emission of the mainstream smoke of a cigarette, and avoiding adverse impact on suction quality of cigarettes. An MOF material is used in the production process of the cigarette paper, so as to reduce the HCN emission of the mainstream smoke of a cigarette adopting the cigarette paper by 15 percent or higher, and obtain a higher suction quality. The cigarette paper is simple in preparation method, and low in cost, thereby being suitable for industrial production.

The invention belongs to the field of municipal sludge disposal and treatment and particularly relates to a method for improving sludge settleability and removing organic matter by using filamentous fungi. A spore suspension is prepared from the filamentous fungi, sludge in a concentration tank is directly inoculated with the spore suspension for culture, the concentration of the spore suspension is 1.0*10<6> / mL-5.0*10<6> / mL, the inoculum size of the spore suspension is 1% of the volume of the sludge, the dry matter content of the sludge is 10-30 g / L, solid sludge particles are captured by mycelia of the filamentous fungi and compressed to form mycelium pellets after the filamentous fungi are cultured in the sludge, the original pore structure of the sludge is changed, free water is released, and a bioseparation effect is realized, so that the sludge settleability can be improved and the organic matter in the sludge can be removed simultaneously.

A disclosed tile binder is composed of the following raw materials in parts by weight: 30-50 parts of polyacrylic resin emulsion, 5-15 parts of acrylamide-vinyl acetate copolymer, 5-8 parts of poly(ethylene glycol) butyl ether , 2-5 parts of a polycarboxylic acid water reducer, 1-1.5 parts of acrylonitrile-vinyl chloride copolymerization fiber, 25-40 parts of titanium slag micropowder, 15-25 parts of titanium-pillared clay, and 10-15 parts of water. Compared with the prior art, the production technology of the tile binder is simple, the prepared tile binder is relatively excellent in binding performance, waterproofness, weatherability, acid and alkali resistance, corrosion resistance and construction performance, titanium slag is fully utilized, and a new utilization approach for titanium is exploited when production cost is reduced.

The invention belongs to the technical field of synthesis of biomaterials and particularly relates to a novel PRP-chitosan-silk fibroin composite material capable of rapidly arresting bleeding and a preparation method therefor. The composite material contains a 2%-4% chitosan solution and a 3% silk fibroin solution; and the PRP-chitosan-silk fibroin composite material is prepared by a freeze-drying method through introducing human-derived platelet rich plasma containing a variety of growth factors and a fixed platelet concentration. According to the material disclosed by the invention, ingredients contained are safe and non-irritating; and compared with the prior art, the material has the advantages that the PRP containing the fixed platelet concentration is added, and a substrate structure is changed through adding silk fibroin, so that the rate of coagulation of whole blood is increased, the bleeding time and amount of bleeding of a wound are reduced, the bleeding arresting propertyof the material is improved, and the bleeding arresting speed, pain alleviating and bacterial resistance of the wound are promoted.

A pre-oxidized ternary precursor for a positive electrode material has a general formula of Ni1-x-yCoxMnyO, and x + y is more than or equal to 0.3 and less than or equal to 0.66. The preparation method comprises the following steps: (1) preparing a nickel-cobalt-manganese soluble salt mixed aqueous solution according to a molar ratio recorded in a general formula; preparing an ammonia water solution, wherein the ammonia water solution contains tetraethylammonium hydroxide with the mass fraction of 0.1%-1%; and adding the nickel-cobalt-manganese soluble salt mixed aqueous solution and the ammonia aqueous solution into a reactor in a nitrogen atmosphere in a uniform-speed parallel flow manner, adding a sodium hydroxide aqueous solution, controlling the pH value of a reaction system to be 11.5-12.0, keeping the reaction temperature at 45-60 DEG C, carrying out solid-liquid separation after the reaction is finished, and aging, washing, centrifuging and drying precipitates; (2) calcining the nickel-cobalt-manganese hydroxide at 90-110 DEG C to obtain a low-temperature calcined product; (3) continuously calcining the low-temperature calcined product at 450-550 DEG C for 1-5h to obtain nickel-cobalt-manganese oxide; and (4) washing and drying the nickel-cobalt-manganese oxide to obtain a pre-oxidized ternary precursor;.