643results about How to "Well-developed pore structure" patented technology

The invention relates to graphene-oxide-modified phenolic-resin-based ultrafine porous carbon fiber and a preparation method thereof. The diameter of the fiber is in a range of 0.3-1.7mum, and the specific surface area of the fiber is 500-900m<2> / g. The fiber has a porous structure which is formed by microporous mainly. Micro-pore volume is 0.20-0.50cm<3> / g, and surface oxygen atomic ratio is lower than 10%. The preparation method comprises the steps that: graphene oxide is added into an organic solvent and is subjected to ultrasonic dispersion, such that a graphene oxide solution is formed; termosetting phenolic resin and a high-molecular-weight linear polymer are added into the graphene oxide organic solution, and are completely dissolved by stirring; the mixed solution is spun into composite fiber, and solidification and carbonization are carried out, such that porous phenolic-resin-based carbon / graphite oxide composite ultrafine fiber is obtained. The sources of adopted raw materials are rich. The prepared composite fiber has the advantages of high structural stability, good flexibility, developed pore structure, controllable surface oxygen content, and suitability for practical application.

A preparation method of a flaky nanoholes carbon and carbon nanotube composite belongs to the technical field of new materials. The flaky nanoholes carbon and carbon nanotube composite is obtained based on intercalation growth of a metal-organic framework compound in two-dimensional nanoholes of a lamellar inorganic template, confinement carbonization and template removal by acid corrosion. The method is simple and reliable, the large-scale production of two-dimensional nanoholes carbon flake material and one-dimensional carbon nanotube composite is easy to implement. The obtained nanoholes carbon flake and carbon nanotube composite has highly controllable chemical composition and pore structure height and has a promising application prospect in the catalysis field, the energy storage and conversion field and other fields.

The invention relates to a method for efficiently preparing cotton based mesoporous activated carbon fiber. The method comprises a step (1) of washing cotton, placing the cotton in a hydrothermal reaction kettle, performing heating to 150-200 DEG C at the heating rate of 5-30 DEG C / min, performing hydrothermal carbonization, performing heat preservation for 1-3 hours and then performing cooling to room temperature; a step (2) of dipping carbonization materials obtained from the step (1) into activator solution, performing microwave-ultrasonic joint dipping for 5-30 minutes and then performing filtration, sending filtration materials to a microwave heating device, performing activation for 5-15 minutes at 250-350 DEG C and then stopping microwave output, and a step (3) of washing the activated materials to be neutral and performing drying to obtain the activated carbon fiber. According to the method, the characteristics of microwave inner heating and selective heating are fully utilized, the technological process is simple, the activation temperature is only 250-350 DEG C, the activation time is only 5-15 minutes, the mesoporous proportion of the activated carbon fiber of the product reaches 50-90%, and the adsorptive property is good.

The invention relates to a method for preparing a flue gas SCR (Selective Catalytic Reduction) denitration catalyst. The method comprises the following steps of: mixing ammonium metavanadate, oxalic acid, manganese salt and water for preparing a mixture solution, adding titanium dioxide powder into the mixture solution, heating in water bath and stirring, and obtaining mixed sol by standing at room temperature; putting the mixed sol into a microwave oven, heating and drying by utilizing microwave radiation; and putting dried solid into a muffle furnace for burning. According to the method disclosed by the invention, a temperature window of the SCR catalyst can be broadened to a low-temperature direction, the problems of low denitration efficiency at low temperature and narrow temperature window of a commercial catalyst are solved; compared with the traditional drying method, the microwave radiation heating and drying method has the advantages that low-temperature SCR denitration activity of the composite catalyst can be increased to a large extend, when the activity temperature is up to 250 DEG C, the denitration efficiency of the catalyst prepared by the traditional drying method is up to 51.9%, and the denitration efficiency of the catalyst can be increased by 31.7 percentage points and can be up to 83.6% by the microwave radiation heating and drying method.

The invention discloses a catalyst for smoke denitration. The catalyst comprises the following components in percentage by weight: 77-96% of cellular activated carbon carrier, 1.3-6.5% of MnO and 2.4-18.8% of CeO2, wherein the mixture of the MnO and the CeO2 serves as an active component. The preparation method is as follows: mixing activated carbon with an organic binder, a forming auxiliary and water, carrying out vacuum extrusion molding, drying, and carbonizing, thus obtaining the cellular activated carbon carrier; and preparing the catalyst by using an isopknic impregnation method based on a mixed liquid of magnganous nitrate or manganese acetate and cerous nitrate, wherein the mixed liquid serves as an impregnation liquid. The cellular activated carbon-based denitration catalyst has the advantages of high specific surface area of cellular activated carbon, developed pore structure and small bed pressure drop, and when being used in smoke denitration, the cellular activated carbon-based denitration catalyst has high denitration activity at the wide temperature range of 80-200 DEG C.

The invention provides a method for preparing nutshell activated carbon by a pyrolyzing activation technology and activated carbon. The method takes fragmented dry nutshells as raw materials, which are pyrolyzed under a pyrolysis temperature, and then pickled, washed, and dried so as to obtain activated carbon. Specifically, the raw materials are put in a ceramic pyrolysis reactor first, and the ceramic pyrolysis reactor is filled with air and sealed completely, then pyrolysis is carried out under a pyrolysis temperature of 700-1000DEG C for 1-10h. The prepared activated carbon has a specific surface area of 500-2300m<2> / g, a yield of 5-40%, and an iodine adsorption value of 470-1930mg / g. The one-step pyrolyzing activation method provided in the invention for preparing nutshell activated carbon with high adsorption performance needs no water vapor, phosphoric acid or zinc chloride and other activating agents. The prepared product has high yield and excellent adsorption performance. And the preparation technology is green, clean, and has short process as well as low cost.

The invention relates to an active carbon fiber composite material and a preparation method of the active carbon fiber composite material. The active carbon fiber composite material is formed by compounding an active carbon fiber layer and a silica gel layer covered outside the active carbon fiber layer, is large in specific surface area, light in gram weight and high in mechanical strength, not only maintains the high absorption property and flame-retardant property of the active carbon fiber, but also has the large specific surface area and very low heat conduction performance of silica aerogel, and has the characteristics of heat insulation, toxin prevention and flame-retardant property. The preparation method of the active carbon fiber composite material comprises the steps of: dipping the active carbon fiber layer into silica sol, then taking out the active carbon fiber layer, and drying to obtain the active carbon fiber composite material. The preparation method has the advantages of being simple and feasible as well as low in cost.

The invention provides an oily wastewater ozone catalytic oxidation catalyst and a preparation method of the catalyst. The method comprises the following steps: pre-activating petroleum coke by using water vapor to obtain a catalyst carrier matrix carbon material; carrying out activation reaction by using the catalyst carrier matrix carbon material and an activating agent to obtain a carbon material carrier; mixing the carbon material carrier and a catalyst precursor nitrate solution, drying and roasting to obtain powder carbon comprising active components of the catalyst; evenly mixing the powder carbon comprising the active components of the catalyst with an adhesive, pressing and forming, releasing pressure, and then drying and crushing to prepare the oily wastewater ozone catalytic oxidation catalyst; or evenly mixing the powder carbon comprising the active components of the catalyst with an adhesive, carrying out extrusion forming, releasing pressure, and then drying and crushing to prepare the catalyst carrier, then mixing the catalyst carrier with the catalyst precursor nitrate solution, drying, roasting and cooling, and then preparing the ozone catalytic oxidation catalyst. The catalyst is capable of reducing the ozone dosage, improving COD removing efficiency and reducing COD upgrading cost.

The invention provides a high-activity wet-oxidation catalyst using carbon as carrier as well as its preparing method. It contains one of the noble metals: Pt, Pd, Ru, Ir Rh and Au, uses carbon as carrier and has the weight percents of component: noble metal 0.25-0.5% and the rest carbon, where the carbon surface area is 80-1500 sq m / g. It can heighten dipersivity and utilization ratio of noble metal and at the same time has stronger ability to absorb organic matters and dissolved oxygen, very adaptive to catalysis and its content of noble metal is only 1 / 4-1 / 8 of Japanese similar catalysts and its catalyzing activity is 15-75% higher than the Japanese similar catalysts'. It can largely reduce processing cost and is an effective way to extend the application of wet catalytic oxidizing technique in processing waste water.

The invention discloses a method for preparing bamboo shoot shell-based activated carbon for a super capacitor. The method comprises the following steps of firstly carrying out pretreatment processes such as washing and drying on raw material bamboo shoot shells; then carbonizing the bamboo shoot shells at high temperature, treating by acid to remove trace metal elements, washing by using distilled water and drying; finally, activating, washing and drying to obtain bamboo shoot shell-based activated carbon. The bamboo shoot shell-based activated carbon is tubular in microstructure, the micropore structure is developed, the specific surface area is as high as 3162m<2> / g, and the specific capacitance is as high as 308Fg<-1> when the electric current density is 1Ag<-1>; when the electric current density is 2Ag<-1>, the specific capacitance has no attenuation basically and is as high as 271Fg<-1> after 10000 times of circulation, and thus the cycle performance is excellent, so that the bamboo shoot shell-based activated carbon has good application prospects in the fields of super capacitors and energy storage. In addition, according to the invention, the bamboo shoot shells are taken as raw materials, so that the comprehensive utilization of the wastes is realized.

The invention discloses an absorbent used in sewage phosphorus removal. A carrier of the absorbent is industrial lithium-silicon powder waste slag with a size no lower than 150 meshes. Lanthanum ions are loaded on the carrier. With the absorbent, the removal rate upon phosphorus in phosphorus-containing sewage and wastewater or natural water body with a total phosphorus concentration of 1mg / L and a pH value of 3-8 is always higher than 86%. The invention also discloses a preparation method of the absorbent. According to the invention, the carrier raw material lithium-silicon powder adopted by the absorbent is selected from industrial waste slag, such that the source is wide, and cost is low. With a developed pore structure, the carrier can provide sufficient active absorption points. Only trace of rare earth lanthanum used for modification is needed to be added. The obtained absorbent has excellent phosphorus absorption effects in natural water bodies, sewage and wastewater. With the absorbent, an absorption capacity is high, absorbent stability in water body is high, no water body secondary pollution is caused, and cost is low. The absorbent has a good application prospect.

The application discloses a nanoparticle coated lithium ion battery diaphragm and a preparation method thereof. The nanoparticle coated lithium ion battery diaphragm comprises a basal membrane and nanoparticles coated on at least one surface of the basal membrane, wherein the nanoparticles have porous structures, and at least a part of channels penetrate the surface of the nanoparticles. The nanoparticle coated lithium ion battery diaphragm employs the nanoparticles with the porous structures to prepare a coating, the nanoparticles with the porous structures have developed channel structures,lithium ions can diffuse in gaps between nanoparticles, and lithium ions can freely diffuse in the internal channels in the porous structures of the nanoparticles, in order to improve porosity of thediaphragm with the nanoparticle coating, and improve wettability of diaphragm electrolyte. The nanoparticle coated lithium ion battery diaphragm keeps heat resistance of the traditional diaphragms with nanoparticle coatings, and at the same time improves conductivity of lithium ions, so that batteries have high rate performance and long circulation performance.

This invention discloses a method for preparing activated carbon. It contains procedures of: A, preparation of raw material: cutting ginkgo tree wood into chips; B, Charring: dry distillation charring of said chips in a charring installation with heating temperature of 500-550deg.C, after that keeping the temperature for 40min. Then lowering the temperature to room temperature; C, breaking and sieving: the chips such charred are then broken, and then being sieved and classified into various sized granules; D, activating: said granules are then heated, under steam protective atmosphere (supply volume being 100-140ml) at temperature 800-850deg.C for 40-60min; E, aftertreatment: removing the dust and drying them, so obtaining the inventive product. The activated carbon has excellent porous structure, higher activity yield, greater specific surface area and strong decolorization. It can absorb benzene, formaldehyde, ammonia, trichloromethane and heavy metals such as lead and cadmium.

The invention discloses a method for preparing super active carbon by taking biomass power plant ash as a raw material. A particular preparation process is as follows: the biomass power plant ash is boiled by alkali and then is filtered to filter insoluble substances; a hydrochloric acid solution is added into the insoluble substances; impurity removal and water washing are carried out to obtain an active carbon precursor, namely residual carbon; the residual carbon is heated and activated in the atmosphere of water steam and CO2 to obtain a middle product; then the middle product and NaOH are mixed to be heated and activated in the atmosphere of N2; an activated product is washed and dried to obtain the super active carbon. The method takes wastes of a biomass power plant as raw materials and utilizes the NaOH with a low price to replace KOH with the high price, so that the wastes are changed into valuable things to obtain the active carbon with a high additional value for a super capacitor.

The invention discloses a flexible water system zinc ion battery. The flexible water system zinc ion battery comprises a cathode layer, an anode layer, a current collection layer, a diaphragm and an aqueous electrolyte. The current collection layer comprises a breathable layer and a substrate layer, the substrate layer is provided with at least one opening holes. The perforated structure of the breathable layer and the substrate layer solves the problems of gas generation and electrolyte drying in the battery circulation process, so that the internal and external gaseous water of the battery reaches the states of circulation exchange and dynamic balance, and the circulation performance of the battery is greatly improved; and the assembled flexible water system zinc ion battery has the advantages of light weight, thin thickness, low cost, environmental friendliness, high safety, good rate capability, high power density and the like, and the excellent bending performance and flexibilityof the flexible water system zinc ion battery can meet the bending requirements of different angles, so that the flexible water system zinc ion battery is suitable for large-scale application and industrial production in the field of wearable electronic equipment.

The invention belongs to the technical field of copper-clad plates and relates to a packing contained thermoplastic liquid crystal polymer composite material, a prepreg and a circuit board. The packing contained composite material includes a three-dimensional net-structure material and packing spread in pores of the three-dimensional net-structure material, and the three-dimensional net-structure material is mainly formed by mutual lapping or adhering of thermoplastic liquid crystal polymer fibers. By the arrangement of the packing contained composite material, the prepreg and the circuit board which are obtained are isotropic in X and Y directions in dielectric constant, low in the dielectric constant and dielectric loss and good mechanical performance.

The invention discloses a fragrance enhanced granular additive for filter sticks and a preparation method and application thereof. The fragrance enhanced granular additive for the filter sticks is prepared and obtained by mixing fragrant edible powder, vegetal granular powder, a binding agent and a swelling agent via a solution, squeezing for granulation and microwave drying; the prepared fragrance enhanced granular additive for the filter sticks is added in the filter sticks of cigarettes to enhance fragrance and lower tar content in smoke; the fragrance enhanced granular additive is few in add amount and great in tar content lowering; specific composite fragrance is provided with the cigarettes are smoked, and more abundant experience in taste and smell is brought to smokers. In addition, the preparation method of the fragrance enhanced granular additive for the filter sticks is simple and low in production cost, and industrial production can be realized.

The invention provides a method of crystallized preparation of a ZSM-5 molecular sieve in-situ by using a direct method without a template. The method comprises pre-treating high-temperature-roasted kaolin microspheres containing a characteristic structural unit of a five-membered ring by using sodium silicate, adding acid to prepare a reaction mixture, and performing hydrothermal crystallization to obtain in-situ products containing the ZSM-5 molecular sieve and ex-situ ZSM-5 molecular sieve. The kaolin microsphere in-situ crystallized ZSM-5 molecular sieve has a relative crystallinity being capable of being adjusted within 65 % according to requirements, has a crystal size being 0.1-3 [mu]m, is good in wear resistance performance and can be used as a catalytic addictive for increasing propylene yield in a FCC technology. The co-produced ex-situ ZSM-5 molecular sieve has a crystallinity being more than 90 %, and a crystal size of 0.1-3 [mu]m, and can be used for preparing a semi-synthetic catalyst.

The invention discloses a crosslinked chitosan-biochar microsphere adsorbing material. The material is prepared from chitosan, biochar powder and a crosslinking agent, and chitosan and the biochar powder are uniformly mixed. A preparation method of the material comprises the steps as follows: firstly, adding chitosan to a diluted acid solution and performing stirring to form sol; then, adding thebiochar powder to the sol and performing stirring to form mixed sol; next, dropping the mixed sol in an alkaline solution to form microspheres; after washing the microspheres to be neutral, soaking the microspheres in a crosslinking agent, and washing the microspheres with deionized water to be neutral after soaking. According to the crosslinked chitosan-biochar microsphere adsorbing material andthe preparation method thereof, the prepared crosslinked chitosan-biochar microspheres have the characteristics of advanced, rough and complex pore structures, have larger specific surface area, havegood adsorption capacity for heavy metal ions and organic dyes in water and can be completely recovered after use, and the secondary pollution problem due to the fact that chitosan and biochar are difficult to recover completely when adsorbed in the form of powder is solved.

The present invention relates to a porous ceramic bamboo charcoal absorbing material that is used on the surface of load magnetic metal, and a preparation method thereof, belonging to the field of the absorbing material of electromagnetic wave. The generation of the ceramic surface of the bamboo charcoal, the inner load magnetic metal and the silicon-based ceramic crystal whisker in the pore channel can simultaneously has the functions of three loss mechanisms that comprise resistance, dielectric and magnetic media, so as to effectively absorb electromagnetic radiation.

A method for preparing coconut shell activated carbon with a silver controlled-release sterilizing function through hydrothermal reaction is characterized in that: using coconut shell activated carbon as a raw material and silver nitrate as an impregnating liquid, preparing silver-carried activated carbon through hydrothermal reaction, and forging at a high temperature under nitrogen protecting conditions to obtain the product. The operating technology has the main characteristics that the coconut shell activated carbon is used as the raw material, the absorption capacity is high, the speed is high, and the product is durable and regenerative; silver is more effectively loaded on the activated carbon through hydrothermal reaction preparation, and high specific surface area (1000m<2> / g) and high antibacterial activity (the sterilizing time of 107 / mL is 35 minutes) are obtained; high-temperature forging is favorable to the reactivation of the silver-carried activated carbon, silver granules are more uniformly distributed on the surface of the activated carbon, and a silver controlled-release function is realized.

A preparing method of active bamboo charcoal powder is disclosed. Bamboo is adopted as a raw material. The method includes steps of drying, smashing, alkali dipping, drying, charring, activating, washing, drying and smashing. The drying temperature is 100-110 DGE C and drying time is 4-6 h. The first smashing step is a step of smashing bamboo sheets with a smashing machine into bamboo powder and sieving with a sieve having a size of 80 meshes. The alkali dipping step is a step of dipping the bamboo powder with a sodium hydroxide solution having a mass concentration of 25-35%, with the temperature of the dipping solution being controlled to be 25-40 DEG C. The charring step is a step of heating the dried bamboo powder in a vacuum oven and maintaining the temperature. The activating step is a step of heating the charred bamboo powder in the vacuum oven and maintaining the temperature. The washing step is a step of washing with deionized water until neutrality. The method is reasonable in design and simple and convenient in operation. The prepared active bamboo powder is higher in specific surface, high in mechanical strength, developed in fine hole structure, high in adsorption speed, and high in adsorption capacity.

The invention discloses a production method for an aluminum-doped zinc oxide nanometer material, which includes the steps of adding zinc nitrate, aluminum nitrate and citric acid or urea or carbohydrazide in a beaker, wherein mole ratio of citric acid or urea or carbohydrazide to nitrate is 0.5-1.2, aluminum content is 0.5-5.0 at%, adding deionized water, stirring, fully dissolving, then placing on a digital display constant temperature magnetic stirring device, heating and stirring continuously, and controlling temperature of the solution to be between 60-70 DEG C until the solution forms sol; controlling the temperature of the sol to be 80 DEG C till pale yellow gel is formed, and stopping heating and stirring; placing the beaker with the gel into a box-type resistance furnace preheated to 180 DEG C, maintaining the temperature for 3-5 hours, stopping heating, cooling naturally to room temperature, and taking out to obtain fluffy pre-cursor powder; and placing the obtained pre-cursor powder into the box-type resistance furnace, and placing precursor into the box-type resistance furnace to conduct heat treatment to obtain the multi-hole grid stick-shaped aluminum-doped zinc oxide nanometer material.

The invention discloses an eggplant straw modified activated carbon water purifying agent which is prepared from the following raw materials in parts by weight: 40-50 parts of eggplant straw, 110-120 parts of activated carbon, 3-6 parts of magnesium nitride powder, 10-15 parts of bentonite, 15-20 parts of industrial aluminum sulfate, 4-7 parts of jade powder, 4-7 parts of medical stone powder, 8-10 parts of sepiolite powder, 10-15 parts of corn starch, 4-5 parts of modified diatomite and a suitable amount of water. By using eggplant straw as a raw material for production, the eggplant straw modified activated carbon water purifying agent disclosed by the invention has the advantages of developed activated carbon pore structure, large specific surface area, high adsorption speed, good adsorption capability to various solutes, free gases and the like; the use of stone powder of bentonite and the like has the effects of bacterium inhibition, decoloration, ionic exchange and release of microelements beneficial to a human body; the use of aluminum sulfate can be used for flocculating pollutants in water. The eggplant straw modified activated carbon water purifying agent disclosed by the invention is safe, nontoxic, and suitable for water purification and indoor air purification.

The present invention discloses a method for using pennisetum hydridum lignin for preparation of active carbon and application of the active carbon, the method comprises the following steps: hydrothermal coke can be prepared from the pennisetum hydridum lignin as a raw material by a hydrothermal method, the hydrothermal coke is impregnated with a solution of phosphoric acid, then the impregnated hydrothermal coke is put into a muffle furnace for carbonization, and finally the impregnated hydrothermal after the carbonization is activated by a hydrochloric acid solution, washed and dried to obtain the active carbon. The active carbon prepared from a pennisetum hydridum waste residue is just suitable for detoxification and decoloration of a hydrolyzate after pennisetum hydridum hydrolysis due to the pore size of the active carbon, and compared with the decolorization effect of purchased commodity active carbon, the decolorization effect of the active carbon is better.

The invention relates to a combination device for the deep purification of contaminated surface water using reclaimed water and sewage as main water sources. The combination device comprises a multi-layer filter material high-efficiency biological filter reactor, a biologically-enhanced anoxic biological filter reactor, a coagulative precipitation tank, an ozone contact tank and an aerobic biologically-enhanced activated carbon filter reactor which are sequentially connected. The invention also discloses a method for purifying water by using the device, which comprises the following steps: sewage is pumped through a pipeline into the multi-layer filter material high-efficiency biological filter filled with two porous suspension type fillers to be subject to synchronous nitration and denitrification reactions; then, the sewage flows into the biologically-enhanced anoxic biological filter reactor to be subject to a biochemical reaction under the anoxic conditions; subsequently, a treating fluid is added into the coagulative precipitation tank to remove most of suspended substances and part of organic substances under the action of a coagulating agent; the supernate of the precipitation tank flows into the ozone contact tank and then flows into the aerobic biologically-enhanced activated carbon filter reactor after ozone oxidation, and pollutants are adsorbed by activated carbon and are simultaneously degraded by enhanced aerobes; and ultimately, the outlet water from the filter tank flows into a clean water tank.

The invention discloses a preparation method of millimeter-scale hierarchical pore carbon balls. Macromolecule-based spherical activated carbon is prepared with a nonsolvent induced phase separation method in a membrane separation field, and balling obtained through suspension polymerization of phenolic resin is replaced; millimeter-scale spherical macromolecule-based precursors with very narrow particle size distribution are obtained through an injection pump extrusion process; a few of added pore forming agents form a rich pore structure; a little of added phenolic resin has a structure support action, and excellent sphericity degree and strength are kept; the prepared porous carbon balls have rich pore structures and high mesoporous content. The millimeter-scale hierarchical pore carbon balls are simple to prepare, and the preparation method has the advantages of simplicity and controllability in operation, low cost, easiness in industrial production expansion and the like; the prepared millimeter-scale hierarchical pore carbon balls have wide application prospect in the fields of catalysis, separation, restoring of polluted environment and the like.

The invention relates to a hydrangea flower-cluster-shaped bismuth tungstate / biocarbon composite photocatalytic material, a preparation method and an application thereof. The preparation method comprises the following steps: firstly adding biocarbon, Bi(NO3)3.5H2O and Na2WO4.2H2O into water, mixing uniformly, then adding a surface active agent to mix uniformly, and thus obtaining reaction precursor solution, wherein the proportion among Bi(NO3)3.5H2O, Na2WO4.2H2O, biocarbon and the surface active agent is (3-5)mmol:(1-3)mmol:(0.1-0.3)g:(1.2-1.8)mmol; adjusting the pH value of the reaction precursor solution to 1-3; carrying out hydrothermal reaction on the reaction precursor solution with adjusted pH value; and after the hydrothermal reaction is finished, taking out products, washing, drying and grinding to obtain the hydrangea flower-cluster-shaped bismuth tungstate / biocarbon composite photocatalytic material. The hydrangea flower-cluster-shaped bismuth tungstate / biocarbon composite photocatalytic material, the preparation method and the application have the advantages that by introduction of the biocarbon, not only can the cost be reduced and the process be simplified, but also the photocatalytic activity of the material can be improved and the degrading effect for organic pollutants is good.

The invention discloses a method for preparing porous carbon by stepwise activation of biomass. The method comprises the following preparation process with the steps: after the biomass is crushed anddried and is mixed with an activating agent, activating treatment is carried out under an inertial atmosphere, and the activating agent and the biomass generate activating reaction to initially form biochar with certain porosity; the biochar and the activating agent are dipped uniformly and mixed again, then the activating agent enters pores of the biochar fully, the effective utilization rate ofthe activating agent with good dispersity is greatly increased in the process of secondary activation, and a carbon skeleton can be fully etched to generate a large amount of micropores and mesopores,so that the porous carbon material with a developed porous structure also can be formed even though a little amount of activating agent is used. The method disclosed by the invention has wide application prospect in the fields of catalysis, adsorption and energy storage and the like so as to realize green preparation of the porous carbon material by the biomass and be conductive to push the high-value utilization progress of the biomass.

The invention provides a preparation method of a flexible self-supporting three-dimensional porous graphene film. The preparation method comprises the following steps: selecting a high molecular polymer with low thermal stability as a templating agent, blending with graphene oxide, performing suction filtration to form a film, and then performing high-temperature heat treatment under the protection of inert gas, wherein during the high-temperature heat treatment, the graphene oxide is reduced into graphene, and the high molecular polymer with the low thermal stability is completely decomposedto leave developed pores, so that the flexible self-supporting three-dimensional porous graphene film is obtained;and the thickness of the film can be controlled within the range of 5-100 microns, thepore size is in the range of 5-100 nm, and the specific surface area is 300-1600 m<2> / g. The shape, the size and the porosity of the prepared flexible self-supporting three-dimensional porous graphene film can be conveniently regulated and controlled through the morphology (such as linear, spherical and columnar), the molecular weight and the dosage of the high molecular polymer template. The flexible self-supporting three-dimensional porous graphene film can be applied to the fields of flexible supercapacitors, flexible batteries, microelectronics, ion adsorption, membrane separation and thelike.