59results about How to "BET specific surface area is high" patented technology

The invention discloses a modification method of a ZSM-5 zeolite. The method comprises: in a closed system containing a low molecular weight organic solvent, first treating a ZSM-5 zeolite with an alkali solution; then treating a ZSM-5 zeolite with an acid solution, and finally conducting separation, washing and drying so as to obtain a modified ZSM-5 zeolite. In the zeolite modification method provided in the invention, the organic solvent added during alkali treatment can promote the generation of a mesoporous structure so as to make a micropore structure convert to a meso-pore efficiently,and can stablize and protect the micropore structure. The subsequent acid treatment can elute amorphous aluminum in a zeolite crystal so as to reach the purposes of dredging pore channels and increasing the total specific surface area. Therefore, the method of the invention can reserve more complete micropores in the ZSM-5 zeolite and provide more mesopores, and simultaneously can increase the total BET (Brunauer-Emmett-Teller) specific surface area.

The invention discloses a preparation method of a hydrophobic natural macromolecule / attapulgite composite aerogel. The preparation method includes the steps: firstly, dissolving natural macromolecules into water to obtain transparent solution; secondly, adding attapulgite and organic silicon modifying agents into the solution, uniformly stirring mixture, and freezing the mixture; finally, performing vacuum freeze drying for the mixture to obtain corresponding hydrophobic natural macromolecule / attapulgite composite aerogel. The hole diameter of the composite aerogel is 2-700nm, the BET specific surface area of the composite aerogel highly reaches 30-800m<2>*g<-1>, the apparent density of the composite aerogel is 0.02-0.35g*cm<-3>, the heat conductivity of the composite aerogel is 0.01-0.05W*m<-1>*k<-1>, the compression modulus of the composite aerogel is 0.05-10MPa, the contact angle of the composite aerogel is 90 DEG C to 179.9 DEG C, and combustion heat value of the composite aerogel is 0.6-1.9MJ-kg<-1>. The natural macromolecule / attapulgite composite aerogel prepared by the method is good in blocking performance and hydrophobicity, low in density and heat conductivity and high in strength, the combustion heat value is lower than 1.9MJ-kg<-1>, A-grade flame-retardant requirements are met, the preparation method is simple in process, short in period and free from pollution, and the prepared hydrophobic natural macromolecule / attapulgite composite aerogel is applied to the field such as building energy conservation, petrochemical industry and sewage treatment.

A process for preparing the organic aerogel and its carbon aerogel includes such steps as reaction between resorcin, formaldehyde, organic surfactant and catalyst in water, thermal solidifying to obtain organic gel, natural cooling or baking to obtain organic aerogel, and charring in inertial gas to obtain carbon aerogel.

The invention discloses a method for microwave-assisted rapid synthesis of ordered mesoporous carbon, which belongs to a preparation process of a nanometer carbon material. The method comprises the following steps: a surfactant F127, a phenolic resin and ethyl orthosilicate are mixed evenly; a uniform transparent solution is formed in acid medium by heating and stirring, and is transferred into an evaporating dish to form a thin film; the microwave is utilized to heat and polymerize, the power is between 200 and 600W, and the time is between 30 and 60min; and the high-temperature carbonization is performed under the protection of nitrogen or argon. The utilization of the method can improve the preparation efficiency of the ordered mesoporous carbon and obtain excellent structural performance at the same time.

The invention relates to a preparation method and application of a stepped hole Beta molecular sieve, and belongs to the field of preparation of molecular sieves. The method is characterized in that the macroporous-microporous composite stepped hole Beta molecular sieve is synthesized by taking sub-molten salt activated kaolin or rectorite as all of an aluminum source and part of a silicon source, uniformly mixing the activated minerals, an alkali source, an supplemented silicon source, crystal seeds and deionized water according to a certain ratio under the condition of adding no organic template agent and performing one-step hydrothermal crystallization. According to the method provided by the invention, the sub-molten salt activated natural minerals are used as all of the aluminum source and part of the silicon source, and no organic template agent is used in the synthesis process, thereby greatly lowering the synthesis cost of the Beta molecular sieve, and obviously improving the greenness in the production process of the molecular sieve material; and the synthesized Beta molecular sieve is a macroporous-microporous composite stepped hole material, and has high relative crystallinity and high BET specific surface area, thereby having favorable industrial application prospects.

The invention relates to a Ru and / or Ir noble metal oxide with a molecular formula expressed as Ru*Ir1-xO2, wherein x satisfies the relation of: 0<=x<=1. The noble metal oxide is prepared by using an amino modified silicon oxide molecular sieve SBA-15 as a template, and impregnating and reducing the Ru and / or Ir noble metal into surrounding holes of the template housing by Coulomb and capillary effect. The method is a simple preparation method of noble metal oxide with controllable morphology, and applies a hard template method to preparation of binary noble metal oxide to expand its scope of application. The Ru*Ir1-xO2 prepared by the invention shows good oxygen evolution electro-catalysis performance when used as a solid polymer electrolyte (SPE) water electrolyzer anode catalyst. The invention has extensive application value in regenerative fuel cell (RFC), photoelectric catalysis and electrolysis hydrogen generator device.

The invention discloses an ethanol gas sensor based on an In2O3 microflower / SnO2 nanoparticle composite material and a preparation method of the sensor, belonging to the technical field of gas sensors. The ethanol gas sensor consists of a nickel-cadmium alloy heating coil, an alumina ceramic tube, a platinum wire, a gold electrode and an In2O3 microflower / SnO2 nanoparticle composite material. By utilizing the catalytic activity of SnO2 on In2O3, the oxidative activity of the material is improved, so that the sensitivity of the sensor is greatly improved, materials with morphology are directly mixed at the first time, the large specific surface area of the material is utilized, and the catalytic characteristics between oxides are utilized. According to the material, ethanol gas molecules are transported on the surface and have the characteristics of rapid adsorption and desorption, so that the response and recovery speed of the sensor is increased. Compared with an ethanol sensor manufactured by In2O3 microflowers which are not compounded with SnO2 nanoparticles, the ethanol sensor disclosed by the invention has the advantages that the sensitivity is greatly improved, and the sensitivity of the ethanol sensor disclosed by the invention is about 9.5 times that of the sensitivity of the ethanol sensor manufactured by In2O3 microflowers.

The invention discloses a method for preparing a mesopore-micropore zeolite molecular sieve material. The method comprises the following steps of: mixing an alkaline solution, an organic solvent and micropore zeolite, and performing microwave treatment; performing acid solution treatment, separating, washing and drying to obtain the mesopore-micropore zeolite. By the method, the micropore zeolite is subjected to microwave treatment in the existence of the organic solvent and the alkaline solution, so that formation of mesopores can be promoted, and micropores are efficiently converted into the mesopores and can be stabilized and protected; amorphous aluminum in a pore channel of a zeolite crystal can be eluted in the subsequent acid treatment process, so that aims of dredging the pore channel and increasing the total specific surface area are fulfilled; and the relatively complete micropores can be reserved in the mesopore-micropore zeolite, a plurality of mesopores are provided, and simultaneously, the total Brunauer, Emmett and Teller (BET) specific surface area can be increased.

The invention relates to a surface modified metal-organic framework compound, and a preparation method and an application thereof. The surface modified metal-organic framework compound is a metal-organic framework compound with a superhydrophobic surface, obtained by chemically modifying and connecting the outer surface of crystals of a metal-organic framework material with a functional hydrophobic group by a surface modification process. The hydrophilic metal-organic framework material is successfully modified into the superhydrophobic metal-organic framework material, and the modified metal-organic framework material has the advantages of fast oil absorption, large adsorption amount, high cycle number and the like; and more importantly, the preparation method has the advantages of fastness, easiness in operation, and cheap raw materials. The surface modified metal-organic framework compound has excellent application prospects in the fields of future sewage treatment and oil-water separation.

The invention relates to a method for preparing a covalent organic framework material by high-pressure homogenization. According to the synthesis method, at normal temperature and normal pressure, a common organic ligand is used as a raw material, water or an organic reagent is used as a solvent and a template agent, organic acid and inorganic acid are used as catalysts, and the corresponding COFs are obtained by homogenizing for a certain time through a high-pressure homogenizer. The method comprises the following steps of: adding 2, 4, 6-trihydroxy-1, 3, 5-benzenetricarboxaldehyde and p-phenylenediamine into a beaker, adding a proper amount of water and acetic acid, uniformly mixing, adding the mixture into a high-pressure homogenizer, and homogenizing for a certain time; and carrying out suction filtration on the product powder after the homogenizing reaction, recycling the filtrate, washing the product powder, and carrying out vacuum drying to obtain the covalent organic framework material HPH-Tp-Pa-1. Compared with other COFs preparation methods, the method provided by the invention has the advantages of continuous reaction, simple operation, low cost, high yield, environmental protection, energy saving, short reaction time and the like, has the potential of large-scale production, and can greatly promote the industrial production process of the COFs material.

The invention discloses a method for preparing a multistage-hole ZSM-5 molecular sieve, and belongs to the technical field of synthesis of molecular sieves. The invention provides the preparation method of the multistage-hole ZSM-5 molecular sieve which is low in cost and low in pollution, can change a silicon aluminum ratio (30-100) to the molecular sieve in a wide range, and has a large mesoporous volume. The method comprises the following steps of I, preparing crystal seeds for the synthesis of the multistage-hole ZSM-5 molecular sieve; II, preparing mixed gel, and performing stirring at room temperature; III, adding the crystal seeds prepared in the step I into the gel obtained in the step II, performing low-temperature crystallization for a short time, and adding a little organic silicon; and IV, continuing crystallization, performing cooling, performing centrifugal filtration, performing washing, performing drying, and performing roasting so as to obtain the multistage-hole ZSM-5 molecular sieve. According to the method provided by the invention, a few organic amine template agents are used only in the crystal seed synthesizing process, an s small, so that d besides, the addition amount of the added organic silicon as a mesoporous hole forming agent i compared with a method for synthesizing other multistage-hole ZSM-5 molecular sieve, the method disclosed by the invention has the advantages that the dosage of the template agents is small, products have a large mesoporous volume, and the problems that the production cost of the molecular sieve is high and environment is polluted caused by the condition that the organic template agent is high in price and large in toxicity can be solved.

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 double-crosslinking-network silicon-based aerogel. The aerogel has -C-C and Si-O-Si dual crosslinking bonds; and the pore diameter distribution is 2 to 1000nm, the BET specificsurface area reaches 100 to 800m<2>.g<-1>, the density is 0.05 to 0.55g.cm<-3>, the heat conductivity is 0.015 to 0.06W.m<-1>.K<-1>, the compression modulus is 0.8 to 15MPa, the bending modulus is 0.1 to 1MPa and the contact angle is 120 to 170 degrees. A preparation method of the double-crosslinking-network silicon-based aerogel comprises the following steps: firstly, dissolving an organic monomer containing two or more than two -C=C- and silane containing the -C=C- into a solvent; carrying out polymerization reaction to obtain -C=C- cross-linked gel; then immersing the gel into an alkalinewater solution to further obtain Si-O-Si bonded cross-linked gel; and drying the gel containing the -C-C and Si-O-Si dual crosslinking bonds to obtain the corresponding double-crosslinking-network silicon-based aerogel. The double-crosslinking-network silicon-based aerogel prepared by the invention has the advantages of good blocking performance, high strength, low heat conductivity and good hydrophobic performance and can be applied to fields including building energy saving, petrochemical industry, sewage treatment and the like.

The invention relates to a method for preparing organic airgel and carbon airgel by normal pressure drying method. In this method, resorcinol and furfural are used as reaction monomers, hexamethylenetetramine is used as a catalyst, organic reagents such as isopropanol are used as solvents, and organic gel is obtained by heating and curing; then, it is directly dried or heated under normal pressure. Organic aerogels are obtained by drying; afterward, charcoal aerogels with high specific surface area are obtained by carbonization in an inert atmosphere. The carbon airgel preparation process of the present invention avoids the complex process of the conventional supercritical drying method, the technology is simple, fast, and has low equipment requirements, and can realize the industrialized production of the carbon airgel.

The invention relates to a water-stabilized zinc-copper metal organic frame material and a preparation method and application thereof. The water-stabilized zinc-copper metal organic frame material has the chemical formula of ZnxCu1-xBIm, wherein x is smaller than 1. ZnxCu1-xBIm is shown as the structural formula (please see the formula in the specification), wherein zinc or copper occupies metal sites of ZnxCu1-xBIm. The preparation method includes the steps of firstly, mixing organic ligand BIm, Zn(NO3)2.6H2O and Cu(NO3)2 to be dissolved into DMF or the mixed solvent of DMF and ethyl alcohol with the volume ratio between 4 to 1 and 3 to 1, wherein the ratio of the molar weight ratio of BIm to the total molar weight of Zn(NO3)2.6H2O and Cu(NO3)2 is 1 to 1, the molar ratio of Zn(NO3)2.6H2O to Cu(NO3)2 is between 99 to 1 and 85 to 15; secondly, making the materials react for 24-72 h at a temperature of 100-140 DEG C or adding auxiliaries to react to generate solid products, cooling to the room temperature, and conducting filtering, DMF washing and drying. The water-stabilized zinc-copper metal organic frame material can be used as carbon dioxide adsorbent, has high water stability, acid stability and thermal stability, has a high porous property, has a high BET specific surface area and high CO2 adsorption capacity, and has potential application on the aspects of the greenhouse effect and the like.

Belonging to the technical field of metal organic skeleton materials, the invention discloses a method for repairing a copper base-metal organic framework porous material. The method includes the steps of: putting a structure collapsed copper base-metal organic framework porous material into a ball mill, and adding a repair solvent to conduct ball milling; after ball milling, taking out the solid material and performing drying, thus obtaining the repaired copper base-metal organic framework porous material. The copper base-metal organic framework porous material obtained by the repairing method provided by the invention has a BET specific surface area restored to 95% of a new HKUST-1 material, and adsorption capacity restored to 92% of the new HKUST-1 material. The repairing process of the method provided by the invention only needs adding of trace solvent, and has the characteristics of rapid repairing and simple operation, thus being an efficient and economical novel green repairing method.

The invention belongs to the field of electrochemical energy storage, and relates to an electrodeposition MOF-derived HKUST-1-LDH super capacitor electrode material and a preparation method thereof. The method comprises the steps of firstly, taking carbon cloth as a substrate, preparing an in-situ growth MOF material CC / HKUST-1 (Cu-MOF) from copper nitrate trihydrate and 1, 3, 5-trimesic acid through a solvothermal method, then etching the CC / HKUST-1 material in one step through an electrochemical deposition method, and obtaining the CC / HKUST-1-LDH composite nanomaterial with the three-dimensional urchin-shaped structure. According to the invention, the problems of easy accumulation and uneven distribution of the material in the etching of a traditional hydrothermal method are overcome through a simple and controllable electrochemical deposition method, the preparation method of the prepared material is simple and easy to implement, the material is uniformly distributed on the surface of a carrier, and the material has a larger BET specific surface area, long charging and discharging time, high specific capacitance and good cycling stability.

The invention which belongs to the nanomaterial preparation field concretely relates to a nesting doll-shaped manganese oxide nanocrystalline grain composite particle and a preparation method thereof. The nesting doll-shaped manganese oxide nanocrystalline grain composite particle is characterized in that: the shape of the particle is spherical, the particle size is 0.7-7mum, and the BET specificsurface area is 20-310m<2> / g; and the structure of the particle has a shell-core nesting doll shape, the shell and the core are respectively composed of manganese oxide nanocrystalline grains, and surfaces of the shell and the core are full of mesopores. The nesting doll-shaped manganese oxide nanocrystalline grain composite particle has the advantages of spherical shape, controllable dimension, good fluidity, shell-core nesting doll-shaped structure, realization of a case that surfaces of the shell and the core are full of mesopores, large specific surface area, and no need of a surfactant, convenience and easy implementation, and low cost of the preparation process.

The invention discloses a preparation method of a charcoal ammonia adsorbent. The method mainly comprises the steps of shaddock peel raw material treatment, dipping activation, carbonization reaction,washing separation, drying and sieving, dipping modification and the like. The shaddock peel charcoal ammonia adsorption material prepared by the method has a developed pore structure, and a large number of pores are communicated with one another; the material is high in mechanical strength, high in thermal stability and good in ammonia adsorption effect; compared with common commercial activatedcarbon, the porous structure is richer, and the BET specific surface area is increased by 5-10 times. And the method provided by the invention makes resource utilization of solid wastes into charcoal, and has the advantages of high yield, easy realization of continuous large-batch production, and low cost.

The invention provides a carbon aerogel. The carbon aerogel is of a three-dimensional network structure stacked by carbon particles; the surface of the carbon particle is of a micropore structure; thecarbon aerogel is a super-pure carbon aerogel without metal element impurities. The carbon aerogel has the advantages that a uniform mesopore structure is formed, the stereo feel of the three-dimensional network is strong, the space network structure is stacked by the carbon microspheres, the microspheres are tightly distributed and connected, and the whole structure is complete; the carbon aerogel has the mesopore structure stacked by the carbon microspheres, and the carbon microsphere self has a large amount of micropore structures, so as to enhance the specific surface area of the carbon aerogel, and the BET specific surface area can reach about 1300m<2> / g; the normal-pressure drying method is adopted, the solvent exchange is avoided, the inorganic metal alkaline catalyst is not used,and the super-pure carbon aerogel with good biocompatibility is obtained; the carbon aerogel can be widely applied to the fields of food-level medicine loading, catalyst loading, material adsorbents,energy storage materials and the like.

The invention discloses a method for preparing silicon dioxide aerogel by a sublimation method. The method comprises the following steps of (1) dissolving a sublimation substance in an alcohol-water solvent to obtain a transparent solution; (2) adding a silicon source and a alkali catalyst into the solution in step (1), uniformly mixing and standing to form gel, and then aging the gel; (3) carrying out vacuum sublimation on the aged gel in step (2) to remove the sublimation substance so as to obtain the silicon dioxide aerogel. According to the method, the sublimation substance can plug the gaps of the gel, plays a role in enhancing the network structure of the gel, and can reduce the shrinkage of the gel; solvent exchange and gel surface modification process are not needed in the preparation process, so that a large amount of organic solvents are saved, and the preparation efficiency of the silicon dioxide aerogel is greatly improved. The silicon dioxide aerogel prepared by the methodis of a nano-pore structure and has the advantages that the pore diameter distribution is 1-200 nanometers; the BET specific surface area is as high as 300-1000 m2 / g<1>, the density is 0.05-0.65 g / cm<3>, and the thermal conductivity is 0.01-0.08 W / m<1> / k<1>.

The invention belongs to the technical field of porous materials and particularly relates to a porous organic material, a preparation method thereof and application thereof. The invention provides thepreparation method of the porous organic material, the method comprises the following steps of carrying out coupled polymerization reaction on an organic monomer to obtain a two-dimensional topological material; mixing the two-dimensional topological material, a catalyst, an external cross-linking agent and a solvent, and carrying out a Friedel-Crafts reaction to obtain a porous organic material,wherein the organic monomer comprises one or more of an aromatic halide, a boric acid substituted aromatic compound, a boronic acid pinacol ester substituted aromatic compound, an alkynyl substitutedaromatic compound and an alkenyl substituted aromatic compound. According to the preparation method, the two-dimensional topological material with framework rigidity is prepared firstly, and then substituent groups are inserted into the middle of a rigid organic network of the two-dimensional topological material and are fixed through covalent bonds, so that the expansion of a porous framework inan original two-dimensional topological material is realized, and the specific surface area and porosity of the two-dimensional topological material are remarkably increased.

The invention belongs to the technical field of inorganic non-metallic materials, and particularly relates to a preparation method of silicon dioxide with a high oil absorption value and a high ASA specific surface area for a storage battery PE separator. The silicon dioxide is prepared by adopting a two-step method, the yield of the silicon dioxide is effectively improved by changing various conditions such as process conditions, concentration of reaction substances, reaction time, temperature and pressure intensity in the reaction process, and the obtained silicon dioxide has high oil absorption, high specific surface area, high dispersity and considerable hydrophilicity, and is good in practicability and suitable for being applied to the storage battery PE separator.

The invention discloses a preparation method of a mesoporous-microporous zeolite molecular sieve. The method comprises the steps of: firstly, treating microporous zeolite in a closed system containing an organic solvent with low molecular weight by utilizing alkali solution; secondly, treating the microporous zeolite by acid solution; and lastly, separating, washing and drying to obtain the mesoporous-microporous zeolite. According to a modification method of the zeolite provided by the invention, when the alkali is treated, the generation of a mesoporous structure is promoted by the added organic solvent, so that a microporous structure is more effectively converted to a mesopore while the microporous structure is stabilized and protected; and amorphous alumina in a zeolite crystal can be eluted by a sequential acid treatment process, so that a hole channel is dredged and a total specific surface area is increased, thus the method provided by the invention can be used for keeping more integrated micropores in the mesoporous-microporous zeolite, providing more mesopores and increasing the BET (Brunauer Emmett Teller) specific surface area.

The invention discloses a method for preparing a mesopore-micropore zeolite molecular sieve material. The method comprises the following steps of: mixing an alkaline solution, an organic solvent and micropore zeolite, and performing microwave treatment; performing acid solution treatment, separating, washing and drying to obtain the mesopore-micropore zeolite. By the method, the micropore zeolite is subjected to microwave treatment in the existence of the organic solvent and the alkaline solution, so that formation of mesopores can be promoted, and micropores are efficiently converted into the mesopores and can be stabilized and protected; amorphous aluminum in a pore channel of a zeolite crystal can be eluted in the subsequent acid treatment process, so that aims of dredging the pore channel and increasing the total specific surface area are fulfilled; and the relatively complete micropores can be reserved in the mesopore-micropore zeolite, a plurality of mesopores are provided, and simultaneously, the total Brunauer, Emmett and Teller (BET) specific surface area can be increased.

The invention relates to a Ru and / or Ir noble metal oxide with a molecular formula expressed as Ru*Ir1-xO2, wherein x satisfies the relation of: 0<=x<=1. The noble metal oxide is prepared by using an amino modified silicon oxide molecular sieve SBA-15 as a template, and impregnating and reducing the Ru and / or Ir noble metal into surrounding holes of the template housing by Coulomb and capillary effect. The method is a simple preparation method of noble metal oxide with controllable morphology, and applies a hard template method to preparation of binary noble metal oxide to expand its scope of application. The Ru*Ir1-xO2 prepared by the invention shows good oxygen evolution electro-catalysis performance when used as a solid polymer electrolyte (SPE) water electrolyzer anode catalyst. The invention has extensive application value in regenerative fuel cell (RFC), photoelectric catalysis and electrolysis hydrogen generator device.

The invention discloses a modification method of a ZSM-5 zeolite. The method comprises: in a closed system containing a low molecular weight organic solvent, first treating a ZSM-5 zeolite with an alkali solution; then treating a ZSM-5 zeolite with an acid solution, and finally conducting separation, washing and drying so as to obtain a modified ZSM-5 zeolite. In the zeolite modification method provided in the invention, the organic solvent added during alkali treatment can promote the generation of a mesoporous structure so as to make a micropore structure convert to a meso-pore efficiently, and can stablize and protect the micropore structure. The subsequent acid treatment can elute amorphous aluminum in a zeolite crystal so as to reach the purposes of dredging pore channels and increasing the total specific surface area. Therefore, the method of the invention can reserve more complete micropores in the ZSM-5 zeolite and provide more mesopores, and simultaneously can increase the total BET (Brunauer-Emmett-Teller) specific surface area.

The invention discloses a method for reducing the emission of nitrous oxide in the soil of a camellia oleifera forest by utilizing bamboo reed biochar, belonging to the field of emission reduction ofgreenhouse gas. The method comprises the following specific steps: step 1, preparation of a raw material: harvesting mature bamboo reeds, cutting the stems of the mature bamboo reeds into bamboo reedpieces with lengths in a range of 1-3 cm, drying the bamboo reed pieces in the air for 1 day, and drying the bamboo reed pieces in a drying oven for a plurality of hours; step 2, carbonization of thebamboo reed pieces: transferring the bamboo reed pieces into a muffle furnace, carrying out heating to a carbonizing temperature in an inert gas atmosphere, keeping the carbonized bamboo reed pieces at a constant temperature for a plurality of hours, and performing natural cooling to room temperature to obtain the bamboo reed biochar; step 3, treatment of the bamboo reed biochar: grinding and sieving the bamboo reed biochar, taking bamboo reed biochar with fineness of 80 to 40 meshes, and treating the bamboo reed biochar with 200 ml of a hydrogen chloride solution with a concentration of 1 mol / L for 10 hours to remove ash in the bamboo reed biochar; step 4, biochar activation: activating the biochar by adopting a KOH method, wherein the BET specific surface area of the activated biochar isnot less than 1200 m<2> / g; and step 5, biochar-soil mixing: mixing the bamboo reed biochar with soil according to a ratio of 1%-5%, adding water after uniform mixing, and enabling the water content of the soil to reach 60% or above.

The invention discloses a montmorillonite composite material and application thereof in adsorbing heavy metals. The montmorillonite composite material comprises montmorillonite and ferrihydrite, wherein the ferrihydrite is dispersed on the outer surface of the montmorillonite. The montmorillonite composite material disclosed by the invention has a relatively large BET specific surface area and a multi-stage pore structure characteristic, not only retains the pore structure characteristic of montmorillonite, but also has the pore structure characteristic of ferrihydrite; the ferrihydrite particles with positive charges and the montmorillonite particles with negative charges on the surface are firmly combined to form a stable montmorillonite composite material; and the composite material has typical structural characteristics of silicate minerals and ferrihydrite with a layered structure, and ferrihydrite nanoparticles are of a spherical particle structure and are wrapped by montmorillonite sheets. The montmorillonite composite material disclosed by the invention is applied to a water body or site soil environment containing various heavy metals, and the heavy metals in the environment can be effectively removed.