1272results about How to "Rich pore structure" patented technology

The invention provides a novel filter stick for cigarettes and a preparation method thereof. Tobacco particles are added in a filter core of the filter stick, tobacco leaves and tobacco smalls are adopted as main raw materials of the tobacco particles and are used as additives after the technical processing such as pulverizing, rotten prevention, granulating, fumigating, perfuming and the like tobe thrown into tows of the filter stick, and then the filter stick containing the tobacco particles or the filter stick with a composite structure can be prepared by adopting a filter stick forming machine. The filter stick can strengthen the adsorption function, can reduce the tar and alleviating the harm, and fragrance of the tobacco particles also can effectively compensate the decreased fragrance of the cigarette caused by the filtering of the filter stick. At the same time, the filter stick is easy to cut and is friendly to the environment.

The invention discloses a cellulose composite microsphere, a preparation method thereof and application. The particle size of the cellulose composite microsphere is 1mum-1200mum, the specific surface area of the cellulose composite microsphere is 100m<2> / g-500m<2> / g, and the aperture of the cellulose composite microsphere is 200nm-900nm. The preparation method comprises the following steps of: preparing a mixture solution of cellulose and a composite material by using the cellulose as a matrix, a polymer material as composite material and a water solution of alkali / urea or alkali / thiourea as a solvent, and obtaining the cellulose composite microsphere through sol-gel phase transition and cross-linking agent cross linkage. The advantages of cellulose microsphere are reserved by the cellulose composite microsphere, and due to the adding of the composite material, new functional groups are simultaneously added for the surface of the microsphere and further decoration and modification are facilitated. An organic solvent used in the preparation method disclosed by the invention can be reused, the whole preparation technology is simple, low in time consuming, undemanding for equipment and convenient for industrial production, and the prepared cellulose composite microsphere has a good flow property and mechanical property and a wide application.

The invention belongs to the field of nano fiber carbon aerogel, and specifically discloses a carbon nano fiber-graphene composite aerogel and a cooperative assembly preparation method thereof. The method comprises: preparing polyacrylonitrile nano fibers by adopting an electrostatic spinning method; preparing surface-functionalized oxidized polyacrylonitrile nano fibers by temperature programmed pre-oxidation; and homogenizing the oxidized polyacrylonitrile nano fibers, then performing cooperative assembly on the oxidized polyacrylonitrile nano fibers and graphene oxide, and performing freeze drying and high-temperature carbonization to obtain the carbon nano fiber-graphene composite aerogel. The preparation method is simple, efficient and environment-friendly, and does not adopt any toxic reagent; the prepared carbon nano fiber-graphene composite aerogel has the advantages of light weight, multiple pores, good elasticity and the like; and the method solves the problem that the traditional film-like electrostatic spinning fiber material is difficult in three-dimensional forming. The prepared carbon nano fiber-graphene composite aerogel serving as a super-capacitor electrode material has excellent capacitance performance.

The invention provides a double metal hydroxide-composited porous bismuth vanadate photo-electrode and a preparation method thereof, wherein a composite of Co-Al double metal hydroxide and bismuth vanadate is grown on the surface of an electric-conductive glass substrate. The pore size of the bismuth vanadate is 50-120 nm and the particle size of the bismuth vanadate is 200-300 nm. The Co-Al double metal hydroxide is grown on the bismuth vanadate particles with the thickness being 10-100 nm. The preparation method includes following steps: 1) preparing a porous bismuth vanadate electrode through an electro-deposition precursor method; and 2) growing the Co-Al double metal hydroxide on the porous bismuth vanadate electrode. The method is simple in operation and is mild in reaction conditions. With zinc ion as an electro-deposition additive for controlling the size and appearance of the bismuth vanadate electrode, the method is more green and environment-friendly compared with a method in the prior art with an organic template agent or organic additives, so that the method is suitable for large-scale production. The photo-electrode can be directly used in photo-electro-chemical water oxidizing catalytic reaction. Because of excellent catalytic performance and visible light absorption capability of the Co-Al double metal hydroxide, the photo-electrode is significantly improved in water oxidizing performance.

The invention relates to a silicon carbide porous ceramic filter and a manufacturing method thereof, in particular to a filter material for high-temperature liquid or gaseous fluid. The ideal silicon carbide porous ceramic filter has the advantages of gradient pore structure, low sintering temperature, high use temperature, high porosity factor, low pressure drop, large geometric surface area, zigzag flow path, high intensity, long service life, low production cost, easy regeneration and repeated use. Moreover, the filter is formed by compounding and sintering a plurality of layers of ceramic materials of different pore structures, and comprises a main body billet layer, a transition compound film layer and a surface compound film layer. Therefore, the filter is suitable for filtration and purification of various high-temperature and low-temperature fluids such as molten metal, high-temperature flue gas, coking gas and automobile exhaust.

The invention relates to the field of secondary batteries, in particular to phenolic resin-based hard carbon microspheres, a preparation method thereof, and a negative electrode material containing the microspheres. The phenolic resin-based hard carbon microspheres provided by the invention are spherical; d002 is 0.375 to 0.380 nm; the specific surface area is 70 to 350 m<2> / g; the pore volume is 0.08 to 0.18 cm<3> / g. The phenolic resin-based hard carbon microspheres provided by the invention have a small specific surface area, structural stability, large interlayer spacing and rich pore structures, and can be applied to the negative electrode material of a lithium-ion battery or a sodium-ion battery, so that the battery has high capacity and stable cycle performance.

The invention relates to modified biomass charcoal and a remediation method of heavy metal contaminated soil. The modified biomass charcoal is prepared by the following steps: (1) sieving biomass charcoal, and washing so as to remove surface fly dust and impurities until the pH value of a scrubbing solution is 6.5-7.5; (2) uniformly mixing the biomass charcoal and a phosphoric acid solution according to the mass ratio of 1 to (1.5-2.5), and then soaking at room temperature for 24 hours above, wherein the mass percent concentration of the phosphoric acid solution is 10-40%; and (3) carrying out solid-liquid separation on the soaking solution, and then drying the obtained a solid material, namely the modified biomass charcoal. The modified biomass charcoal is reasonable in design, is simple in technology, and overcomes the technical difficulty for a long time; phosphoric acid is detained in the biomass charcoal in the form of metaphosphoric acid, and especially can form sediment substances together with active heavy metal ions under a water containing condition, thereby intensifying the passivation or fixing effect to the heavy metal ions by the biomass charcoal.

The invention discloses a solid electrolyte material for a lithium battery and a preparation method and application of the solid electrolyte material, and belongs to the field of energy material preparation. The solid electrolyte material comprises a metal organic framework compound, a lithium salt, a film-forming additive and a filling. The solid electrolyte material for the lithium battery does not need polyoxyethylene or a derivative thereof; and compared with other inorganic solid electrolytes, the solid electrolyte material has the advantages of higher lithium ion containing capability, higher ionic conductivity and better heat stability, and the security of the battery can be greatly improved. The lithium-ion all-solid-state battery prepared by the method has the electrochemical properties equivalent to a liquid electrolyte. The solid electrolyte material for the lithium battery can be used for a lithium-ion battery, can be suitable for the systems of a lithium-sulfur battery, a lithium-air battery and the like, and is wide in application.

The present invention belongs to the preparation field of micropore carbon material, and relates to the preparation method for micropore carbon material with high specific surface area and narrow pore distribution by biomass. The biomass is cleaned and cut into subparagraph with a length of 1~3 centimeter, and then is subjected to carbonizing at 300~500 DEG C for 3~4 hours in the presence of inert atmosphere. The obtained carbonizing product is immerged into an alkaline solution for 20~24 hours until the carbonizing product is totally wetting, and then the carbonizing product is separated from the solution and is activated for 1.5~3 hours at 700~800 DEG C in the presence of inert atmosphere, and then is scrubbed by water until the pH value of the scrub solution is 7~8, and then the carbonizing product is immerged into a diluted acid solution for 4~5 hours and is scrubbed by water until the pH value of the scrub solution is 6~7, finally, the carbonizing product is dried at 80~120 DEG C to obtain micropore carbon material. The preparation method for the present invention has the advantages of that the preparation process is simple, the raw material is cheap and abundant, the preparation condition is free from zone limit; besides, the preparation method is adapted to industrial production.

The invention discloses a method for preparing biomass activated carbon through vacuum freeze drying. The method comprises the following steps: performing steps of raw material crushing, acid treatment, activation soaking, freeze drying, high-temperature activation, acid pickling and the like, performing hydrothermal reaction on biomass raw materials with an acid solution, and further performing freeze drying treatment, thereby obtaining the biomass activated carbon. Compared with the prior art, the method has the advantages that the raw materials are rich and cheap, and rural wastes can be reused; by using a hydrothermal treatment technique in an acid environment, a part of substances in the biomass raw materials can be reduced, and porous loosened structures of the biomass raw materials are maintained; by using a vacuum freeze drying technique, original porous flurry structures of the biomass raw materials can be maintained to the maximum extent, the specific surface area of a product can be increased, and pore structures can be enriched; the biomass activated carbon prepared by using the scheme of the invention is high in specific surface area, rich in pore structure and excellent in synergic adsorption property of water body dye molecules and heavy metal ions, and has significant industrial application values.

The invention belongs to the field of organic nanometer materials and the electrochemistry and discloses a nitrogen-doped porous carbon material and a preparation method thereof. The preparation method of the nitrogen-doped porous carbon material comprises the following steps of: taking a microorganism as a carbon precursor and mixing with Lewis acid to obtain the porous carbon material with rich nitrogen element and large specific surface area after ion thermal reaction. Compared with the prior art, the preparation method has the advantages that raw material resources are rich and are simply and easily obtained, the use of strong acid, strong alkali and other high-pollution chemical reagents is simultaneously avoided, the greenness and the environment friendliness are ensured, the operation is convenient, the energy consumption is low, and the preparation method is suitable for large-scale industrialized production. The nitrogen-doped porous carbon material prepared by adopting the preparation method has a rich pore structure, is larger in specific surface area and rich in nitrogen heteroatom, simultaneously has good electrocatalytic oxygen reduction capability and excellent charge storage capacity and can be used for the preparation of an electrocatalytic oxygen reduction electrode and a supercapacitor.

The invention provides method for preparation of a graphene three-dimensional hierarchical porous carbon material from biomass raw materials of coconut shell, palm shell and apricot shell. The method fully and reasonably utilizes rich resources of biowaste, and avoids the usage of chemical raw materials. The prepared graphene three-dimensional hierarchical porous carbon material has special laminated structure with wrinkles and hierarchical porous structure containing mesopore, micropore and macropore, so that the conductive performance of the material is better than similar materials in the prior art.

The invention discloses a method for preparation of a nitrogen doped porous nano carbon material with biomass as the carbon source by gel process and application thereof. The method includes: selecting soybean residue or soybean as the carbon source, using a transition metal salt as the coagulant, and making soaked, grinded and boiled soybean milk solidify to form tofu gel; and conducting vacuum freeze drying, and performing high temperature carbonization and activation under an inert atmosphere, thus obtaining the transition metal embedded nitrogen doped porous carbon nano material. The preparation method provided by the invention has the advantages of simple process operation, low cost and easy realization of large-scale commercial production. The nitrogen doped porous nano carbon material prepared by the method has a high degree of graphitization, large mechanical strength and high conductivity, is embedded with metal nanoparticles, and can be applied to supercapacitors, lithium-ion batteries, catalysis, adsorption and other fields.

The invention provides a preparing method for a carbon nano tube foam material. The method comprises the steps that cheap polymer foam serves as a template, the processes of in-situ formation of a catalyst, partial thermal cracking removing of the polymer template, growth of carbon nanomaterials and the like are synchronously carried out by controlling experiment conditions, and the carbon nano tube foam material efficiently grows, wherein the carbon nano tubes are wound and woven into a mesh structure in the three-dimensional directions of a carbon framework and have distributed pore diameters of multiple dimensions, and the obtained material has the large specific surface area, the controllable porosity, good hydrophobicity, excellent electrical conductivity, a unique hollow frame structure, and application value in the fields of composite materials, sensing, oil and water separation and the like. According to the method, reaction conditions such as gas flow, gas introducing time, the reaction temperature and the catalyst are optimized, and thus the carbon nano tube foam material of a foam structure is obtained and has excellent adsorption performance on various kinds of oil and organic solvent. The defect of an existing carbon nano tube foam material preparing method is overcome.

The invention discloses nitrogen-doped grading porous carbon microspheres. The nitrogen-doped grading porous carbon microspheres are prepared by performing hydrothermal reaction on glucose and a nitrogen-containing compound and then performing activation, wherein the specific surface area is high and is 1160 to 1791 m<2> / 1, the pore diameter is distributed uniformly and the micropore content is high. The preparation method comprises the following steps: 1) preparing a nitrogen-containing precursor, adding the glucose and the nitrogen-containing compound into water, stirring uniformly, reacting, filtering, washing and drying to obtain the nitrogen-containing precursor; 2) carbonizing and activating the nitrogen-containing precursor, mixing the nitrogen-containing precursor and an alkaline inorganic matter, soaking into water, stirring and drying, and calcining and activating to obtain the nitrogen-doped modified grading porous carbon microspheres; and 3) performing aftertreatment on thenitrogen-doped modified grading porous carbon microspheres, soaking the nitrogen-doped modified grading porous carbon microspheres in a hydrochloric acid solution, washing, filtering, drying and grinding. When the nitrogen-doped grading porous carbon microspheres serve as supercapacitor electrode materials, the specific electric capacity is 248 to 407 F / g. The nitrogen-doped grading porous carbonmicrospheres have an application prospect in the fields of supercapacitors, lithium ion batteries and electric catalysis.

The invention relates to a preparation method of super-hydrophobic, super-oleophylic and ultralight sponge. The preparation method comprises two steps of performing functionalized processing on melamine sponge by using an impregnation method and performing a curing reaction after processing. The melamine sponge used by the invention has a large quantity of active functional groups such as hydroxyl groups and amino groups on the surface, the content of the hydrophobic active functional groups on the surface of the sponge is remarkably reduced after the active groups are chemically functionalized, which causes a result that the surface energy of the material is reduced, thus the sponge is endowed with super-hydrophobic and super-oleophylic effects, and a contact angle between the sponge and water exceeds 150 degrees; and the modified melamine sponge belongs to an ultralight material due to density. The method disclosed by the invention has the advantages that raw materials are low in price and easy to available, the process is simple and easy to operate, the large-scale preparation is easily realized, and the like. The sponge prepared according to the preparation method has the advantages of low density, excellent compression resistance, high oil absorbing speed, high oil absorbing rate, high oil and water separation selectivity and the like, is a novel and efficient ultralight-density oil and water separating material, and has a wide application prospect in the fields such as organic chemical reagent treatment, oil-containing wastewater treatment, and leaking crude oil recovery.

The invention relates to a metal-doped carbon / sulfur compound, and preparation and application thereof. The metal-doped carbon / sulfur compound is prepared through the following steps: blending a carbon-containing organic substance and a metal salt solution, then adding a template agent, roasting at high temperature, and performing hot melt sulfur filling. In the preparation process, the metal element is simultaneously doped in the carbonization process, so that more abundant pore structures are formed in the carbon material, the pore volume and specific area of the carbon material are improved in the carbonization process, the reaction zone of the active substance sulfur is increased, the graphitization temperature of the carbon material is lowered, and the own stability of the carbon material is enhanced while the loading capacity of the active substance sulfur is improved.

The invention discloses a method for preparing composite photocatalyst containing activated carbon coating. In the method, activated carbon as coating is attached on foam material matrix, so that activated carbon coating material is formed, the activated carbon coating material is used as carrier to carry titanium dioxide, wherein the titanium dioxide as an active component is 1 percent to 10 percent by weight, the activated carbon coating is 4 percent to 15 percent by weight, and the balance is the foam material matrix. Since the method uses the activated carbon coating as photocatalyst carrier, the dispersibility of the titanium dioxide as an active component can be effectively enhanced, the defects of the traditional activated carbon material, including loose structure and low strength, are overcome, the transmission of light in a system is improved, the process of transferring pollutant to the catalyst surface is improved, and moreover, the service life of activated carbon can be greatly prolonged.

The invention discloses a modified magnetic sludge biological carbon and a preparation method and applications thereof. The modified magnetic sludge biological carbon is prepared by carbonizing residual sludge, modifying sludge by alkali, and modifying sludge by acid. The provided modified magnetic sludge biological carbon has the advantages of good magnetic property, large specific surface and pore volume, abundant pore structure, many surface adsorption functional groups and adsorption sites, and strong performance on removing target pollutants; and the preparation method has the advantages of simple preparation, easy operation, low cost, high production efficiency, and convenience for large scale production. The provided modified magnetic sludge biological carbon is used to remove tetracycline hydrochloride in water for the first time, has the advantages of large adsorption amount, strong adsorption performance, high adsorption efficiency, simple and convenient operation, short processing period, low processing cost, and easy separation and recovery, and has a strong performance on removing tetracycline hydrochloride. The maximal balance adsorption amount can reach 253.8 mg / g. The performance of the biological carbon is obviously stronger than that of unmodified magnetic sludge biological carbon.

The invention relates to an adsorbent for removing organic chlorides in a hydrocarbon-containing substance flow and a preparation method thereof. The adsorbent comprises a modified zeolite molecular sieve, an inorganic macroporous material and a clay component. The zinc ion-modified zeolite molecular sieve contained in the adsorbent shows remarkably high reaction activity on organic chlorides; compared with the prior art, the adsorbent has relatively high selective adsorption capacity on organic chlorides; moreover, with wide temperature range and low reaction activity, the adsorbent is suitable for removing at least one organic chloride from a hydrocarbon-containing substance flow containing hydrogen, hydrocarbons and chlorides, and particularly suitable for deeply removing organic chlorides in the oil generated by a catalytic reforming reaction as well as the byproduct hydrogen.

The invention relates to a method for preparing activated carbon from coal tar residues and application thereof. The method comprises the following steps: mixing coal tar residues with an activator, reacting in an inert protective atmosphere, cooling, washing in an acidic solution until the pH value is 6-7, and drying to obtain a coal tar porous activated carbon material. The test indicates that the coal tar porous activated carbon material obtained by the method has the advantages of abundant pore structure, large specific area and higher adsorption capacity, the iodine adsorption value is up to 2000 mg / g, the methylene blue adsorption value is up to 400 mg / g, the coal tar porous activated carbon material can be used as an adsorbent in the fields of water purification and super capacitors, and the dye methylene blue adsorption value is up to 700 mg / g. When the coal tar porous activated carbon material is used as a super capacitor electrode material to assembly a high-performance super capacitor, the specific capacitance of the activated carbon single electrode is up to 380 Fg<-1>; and the coal tar porous activated carbon material is microporous-mesoporous composite carbon, of which the specific area is 3500 m<2>g<-1> or so, the pore size distribution is 1-5nm and the pore volume is 1.98 cm<3>g<-1> or so. The method is convenient to operate, low in energy consumption and suitable for large-scale industrial production.

The invention discloses graphene-melamine foam aerogel and a preparation method thereof. The aerogel is black and blocky, density is 8-15mg / cm<3>, and specific surface area is 100-500m<2> / g. The preparation method comprises the following steps: (1) mixing graphene oxide with deionized water to obtain graphene oxide aqueous solution; (2) mixing the graphene oxide aqueous solution with a reducing agent to obtain mixed solution, then putting melamine foams into the mixed solution, and carrying out constant temperature hydrothermal reaction to obtain graphene-melamine foam hydrogel; and (3) putting the hydrogel into a solvent to be cleaned, and then carrying out freeze drying, so that the graphene-melamine foam aerogel is obtained. The graphene-melamine foam aerogel disclosed by the invention has the advantages that superhydrophilic melamine foams are utilized as a skeleton structure to form graphene aerogel, so that the aerogel can be easily immersed in water and can rapidly adsorb organic pollutants in the water; meanwhile, due to addition of the melamine foams, compression performance of the aerogel is improved, and the aerogel can be recycled.

The invention discloses a dimethyl carbonate supported catalyst directly synthesized by methanol and carbon dioxide and a preparation method and a use method. The catalyst adopts diatomite as carrier, transition metal copper and nickel as main components of active components and zinc, iron, cobalt and the like as additives, wherein, the weight percent of diatomite in the catalyst is 60-95%, the weight percent of the transition metals is 5-30% and the weight percent of the additives is 0-15%. The preparation method comprises the following steps: soaking the carrier in a mixed solution of soluble transition metal salt and the additives, dispersing with ultrasound, evaporating and drying, calcining and reducting with hydrogen to obtain the supported catalyst. The use method comprises the following steps: placing the catalyst in a reaction device, adjusting the molar ratio of gas phase methanol to carbon dioxide to 2:1-3:1, and performing a reaction at 110-140 DEG C under the pressure of 0.6-3.0 MPa. The catalyst has the advantage of simple preparation steps, good stability and high catalytic efficiency and overcomes the defect that the carrier used by the existing catalyst needs be processed through complicated steps for pretreatment and has high price and instable catalytic performance.

The invention provides a preparation method of a sulfhydryl activated carbon mercury removal agent.The preparation method comprises the steps that activated carbon is modified by initiatively adopting sulfhydryl modification liquid prepared from mercaptoacetic acid, acetic anhydride and concentrated sulfuric acid, so that hydroxyl on the surface of the activated carbon reacts with mercaptoacetic acid to immobilize sulfhydryl to the activated carbon, and then sulfhydryl activated carbon is prepared.When mercury removal treatment is performed on mercury-containing gas or liquid by adopting the sulfhydryl activated carbon prepared through the preparation method, the sulfhydryl activated carbon shows the relatively high mercury removal precision and mercury penetration capacity, and therefore the sulfhydryl activated carbon prepared through the preparation method can be used as the mercury removal agent.

The invention discloses a method for preparing a positively charged polyvinyl chloride (PVC) hollow fiber nanofiltration membrane. The positively charged PVC hollow fiber nanofiltration membrane has a two-layer structure consisting of a positively charged compact skin layer and an electrically neutral porous support layer; the pore diameter of micropores of the compact skin layer is 1-5nm, and the pore diameter of micropores of the porous support layer is 10-100nm; and the outer diameter of the membrane is 1.5-3.0mm, and the inner diameter of the membrane is 0.5-2mm, wherein the positively charged compact skin layer comprises main components of polyvinyl chloride and cationic copolymer; and the electrically neutral porous support layer comprises main components of polyvinyl chloride and an inorganic filler. The method for preparing the positively charged PVC hollow fiber nanofiltration membrane comprises the following steps of: co-extruding positively charged compact skin layer membrane preparing liquid and electrically neutral porous support layer membrane preparing liquid in a two-layer ring shape; and curing and forming hollow fibers by using a dry-wet spinning process. The prepared hollow fiber nanofiltration membrane has the advantages of easily controlled interception property, high strength, simple preparation process and the like, and is a high-performance, low-cost and long-life nanofiltration membrane material for water treatment.

The invention relates to a porous composite material for purifying formaldehyde and TVOCs and a preparation method of the porous composite material, and belongs to the field of air purification materials. The porous composite material for purifying formaldehyde and TVOCs is characterized by comprising a core-shell structure, wherein the core-shell structure consists of a core material with a porous carbon material, and a shell material containing a catalytic component; pore channels for air circulation are formed in both the core material and the shell material. By adopting the porous composite material provided by the invention, a material formation process can be simple and easy to operate, the purification capacity for formaldehyde can be up to 6.05mg / g, and the purification capacity for methylbenzene can be as high as 299.41mg / g.

The invention provides a functionalized polyethylenimine-grafted porous nano-fiber adsorption material and preparation thereof. The functionalized polyethylenimine-grafted porous nano-fiber adsorption material is characterized by being prepared from porous polyacrylonitrile nano-fibers; the porous polyacrylonitrile nano-fibers are grafted with functionalized polyethylenimine after being hydrolyzed. After the porous polyacrylonitrile nano-fiber material is subjected to graft modification by using the functionalized polyethylenimine, the carbon dioxide adsorption performance and adsorption and desorption cycling stability of the porous polyacrylonitrile nano-fiber material are greatly improved; therefore, the porous nano-fiber high-efficient adsorption material with certain flexibility and strength can be prepared, and has great utilization potentiality in the field of adsorption.

The invention discloses a composite biological carbon-based carrier with pesticide slow release performance and preparation method and application. The composite biological carbon-based carrier is prepared from modified biological carbon, a pesticide solution, sodium carboxymethylcellulose and bentonite. The preparation method comprises the following steps: A, washing rape stalks with water, drying, treating, smashing, and screening for later use; C, performing pyrolysis on the rape stalks at a certain temperature under the condition of limited oxygen to obtain biological carbon, treating the biological carbon with sodium hydroxide, washing with treated biological carbon with deionized water till the pH is constant, drying in a drying oven, and smashing to obtain the modified biological carbon; D, mixing the modified biological carbon with the pesticide solution to obtain a suspension-loaded pesticide, stirring at room temperature, uniformly mixing the sodium carboxymethylcellulose with the bentonite according to weight parts, aging for a certain time, and drying a solid substance in an air blast drying oven at a low temperature to obtain the composite carrier. The invention further relates to application of the composite carrier to rape cultivation. A composite controlled-release substrate does not generate any side effect on soil, has high environment compatibility, and can prolong the release time of the pesticide in soil.

The invention discloses a polyester flat microporous membrane and a preparation method thereof. The microporous membrane comprises the following materials in percentage by mass: 60-99.9% of polyester and 0.1-40% of modifier; or 20-40% of non-woven fabric, 60-79.9% of polyester and 0.1-30% of modifier. The preparation method is realized on the basis of a thermally induced phase separation process and comprises the following steps: mixing the polyester, the modifier and diluter into a homogeneous solution at high temperature; scraping the homogeneous solution into a liquid membrane, cooling andcuring into a membrane so as to form a precursor membrane subject to microphase separation, and extracting to obtain a flat microporous membrane. The prepared polyester flat microporous membrane is in a spongeous structure with the pore diameter of 0.05-5.0 micrometers and the porosity of 30-80%, and has the advantages of narrow pore diameter distribution, uniform pore size, easily controlled pore size, high strength, symmetrical structure and the like, thereby being a filter membrane material for water treatment and a lithium ion battery diaphragm material with high performance, low cost andlong life.

The invention discloses a natural plant material hollow cigarette filter rod as well as a preparation method and application thereof. The hollow cigarette filter rod is prepared by the following steps: uniformly mixing a natural plant particle material with a binder; squeezing into a cake by moulding equipment; mechanically cutting and grinding the obtained cake into a cylinder; and further perforating the cylinder along a central axis. The preparation method has the advantages of low equipment requirements, simplicity in operation, cheap raw materials and low production cost; and the prepared hollow cigarette filter rod has high safety performance, is environment-friendly, has the adsorption interception function of a common acetate fiber hollow filter rod, and can realize an aroma enhancement effect.