61results about How to "In situ growth" patented technology

The invention relates to a method for loading silver nano-particles on a cellulose-containing material, belonging to the field of the preparation of inorganic nano materials. By using the structure that cellulose is rich in hydroxyl and by using the cellulose as a reducing agent, the in-situ growth of nano silver on the cellulose is realized under the condition of heating. The reaction is simple to operate and easy to control, the repeatability is good, no pollution is caused, the cost of raw materials is low and the large-scale production is easy to realize. The obtained cellulose-containing material loaded with the nano silver has the advantages of even nano silver size and distribution and high adhering firmness, and can be widely used for antibacterial packaging paper, medical nursing sterilizing articles, paper for women and the like. The nano silver loaded on the cellulose-containing material has very high and stable enhancing effect and the material can also be used for surface enhanced Raman spectrum substrates.

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 relates to the field of materials, and particularly to a polyaniline / phytic acid conductive hydrogel, a preparation method thereof and a flexible supercapacitor. An electrochemical polymerization method is utilized for preparing the polyaniline / phytic acid conductive hydrogel, and use of an initiator can be effectively prevented. Furthermore a subsequent tedious cleaning process is saved, thereby greatly saving material preparation cost and time. The method can realize original-position growth of the material, and furthermore high homogeneity of the prepared material is realized.Therefore the device has high repeatability and high stability. According to the method, the load amount of an electrochemical active substance can be regulated through controlling polymerization time or concentration of each component in reaction solution, and furthermore an effect of controlling capacity of the flexible supercapacitor is realized.

The invention provides a method for in-situ preparation of a nano-enzyme membrane. The method comprises pretreating an original membrane, carrying out grafting polymerization on the membrane surface,carrying out coordination self-assembling and in-situ growth on the nano-enzyme on the membrane surface, immersing the membrane grafted with polyacrylic acid in a MOFs precursor solution for some timeso that metal ions in the precursor solution and the carboxyl group of polyacrylic acid are assembled to the membrane surface through coordination, adding an organic ligand solution and an enzyme liquid into the precursor solution so that the enzyme is wrapped by the MOFs skeleton structure and the in-situ growth of the nano-enzyme on the membrane surface is realized, and carrying out after-treatment on the nano-enzyme membrane so that the nano-enzyme membrane with the nano-enzyme is obtained. The method greatly improves enzyme activity and stability, improves the loading rate of the enzyme on the membrane, reduces the water contact angle of the original membrane, realizes high water flux and provides the polymer membrane with pollution resistance, biocatalysis, photocatalytic degradationof pollutants and other functions.

The invention relates to a one-dimensional metallic oxide loaded titanium-based electro-catalysis film, a preparing method and catalytic application and belongs to the field of film preparing and organic electrochemical synthesis. A micropore electric conduction film serves as a base film; a hydrothermal method is firstly adopted for conducting in-situ growth of a one-dimensional metallic oxide nanowire precursor structure on the surface of the base film; then an in-situ loaded one-dimensional metallic oxide nanowire structure is obtained on the surface of the titanium-based film through high-temperature roasting treatment, and a three-dimensional porous metal film electrode is prepared; and the three-dimensional porous metal film electrode serves as an anode assembly electro-catalysis reactor, and good catalytic performance is shown in the aspects of alcohol electrochemical oxidization synthesis for aldehyde preparing or acid organic electrochemical synthesis and water treatment. The method is simple and effectively, the cost is low, regulation of the catalyst feature is controllably achieved, the electrochemical performance and the catalytic performance of the obtained film electrode are good, and the problems that the feature, the size and other characteristics of catalyst particles are hard to control, the action force of the catalyst particles on the base film is weak, and stability and current efficiency of the film electrode are poor are solved effectively.

The present invention relates to a method used for preparing a stout carbon nanotube and carbon nanofiber in a carbon composite refractory material. The method is characterized in that raw materials are prepared according to the requirement for the ingredients that are used for preparing the carbon composite refractory material; nickel nitrate with 0.5 to 3 weight percent of the total materials is used for preparing the aqueous solution with the concentration of 10 percent; the aqueous solution is fully mixed with the plate-shaped alundum powder or flake graphite in the refractory material that is used for preparing the carbon composite refractory material; the mixture is dried until the content of water is 1 to 2 weight percent; the raw materials that is mixed with the nickel nitrate is mixed with other residual raw materials that are used for preparing the carbon composite refractory material; the stout carbon nanotube and carbon nanofiber can grow in the carbon composite refractory material after mixed-refining, molding, drying and sintering according to the manufacturing technique of the carbon composite refractory material. The method has the advantages of simple technological process, easily controllable technological parameters, a large amount of stout carbon nanotube and carbon nanofiber that grow in the sintered carbon composite refractory material; the stout carbon nanotube and carbon nanofiber grow well and interweave in the fasciculate shape in the carbon composite refractory material; the length can reach a plurality of microns; a photo taken by a scanning electron microscope can display the clear hollow structure of the stout carbon nanotube and carbon nanofiber, which has the diameter between 50nm and 400nm. The method realizes the in-situ growth of the carbon nanotube and carbon nanofiber in the sintered carbon composite refractory material.

The invention discloses preparation and application of a cobalt and nitrogen co-doped porous carbon microsphere material. The cobalt and nitrogen co-doped porous carbon microsphere material disclosed by the invention is used for the cathodic oxygen reduction reaction electrocatalyst of a fuel cell. Sodium alginate, cobalt-nitrate hexahydrate and 2-methylimidazole are used as the raw materials of the cobalt and nitrogen co-doped porous carbon microsphere material. The preparation method comprises the steps of: preparing hydrogel microspheres from sodium alginate solution through an electronic injection method, taking cobalt nitrate solution as receiving solution, dipping the microspheres for 12 h, so that sufficient ion exchange of cobalt ions and sodium ions is carried out, freezing and drying after respectively washing by using absolute ethyl alcohol and deionized water for two times, then, putting the microspheres in 2-methylimidazole methanol solution to perform room-temperature reaction for 12 h, then, respectively washing by using absolute ethyl alcohol and deionized water for several times, freezing and drying, and carbonizing through a tube furnace to obtain the cobalt and nitrogen co-doped porous carbon microsphere material. Preparation in the invention is simple in process, green and environment-friendly; and furthermore, the prepared carbon microsphere material has good electro-catalytic property, and has important value and meanings in the field of heteroatom doped carbon-based oxygen reduction electrocatalysts.

The invention discloses a magnetic metal-organic framework nanosphere with multiple affinity sites as well as a preparation method and application thereof. The magnetic metal-organic framework nanosphere consists of a Fe3O4 magnetic sphere, a high-molecular polymer intermediate layer coating the surface of the magnetic sphere, a metal-organic framework growing on the high-molecular polymer intermediate layer and arginine grafted on the metal-organic framework. The magnetic metal-organic framework nanosphere disclosed by the invention takes the Fe3O4 magnetic sphere as a kernel and has good magnetic response performance; the metal-organic framework is introduced onto the surface of the magnetic sphere, and the organic ligand surface is modified through the arginine; as metal ions forming the metal-organic framework, a guanidyl on the arginine and the like can be taken as the multiple affinity sites for enriching phosphorylated polypeptides, the enrichment of the phosphorylated polypeptides for single-phosphorylation sites and multi-phosphorylation sites is achieved; the magnetic metal-organic framework nanosphere has high enrichment efficiency and has very important significance in studying the phosphorylation process of physiological behavioral proteins.

The invention discloses a method for producing a carbon felt electrode material for a flow battery and relates to the technical field of production of storage batteries. The method comprises the following steps: pre-treating a polyacrylonitrile (PAN) pre-oxidation felt which serves as a raw material in a carbonized furnace with temperature gradient; placing the carbonized PAN pre-oxidation felt in an activation area, filling O2 or CO2 for reaction, and performing in-situ growth on a COOH group on the surface of the PAN pre-oxidation felt. By the adoption of the method, a carbon felt electrode can be prepared and modified in one step, the type of oxygen-containing functional groups formed on the surface of a carbon felt is changed, and the in-situ growth of the oxygen-containing functional groups is realized. A PAN carbon felt electrode containing different types and numbers of oxygen-containing functional groups can be correspondingly applied to different types and scales of flow battery systems. By comprehensively evaluating the battery performance, an optimal matching relationship between the type and number of the oxygen-containing functional groups and the performance of the flow battery can be constructed, so that the carbon felt electrode material can be optimally applied to the flow battery.

The invention discloses a preparation method and application of a Bi4O5Br2 / thin-layer Ti3C2 composite photocatalyst, belongs to the technical field of nano materials, and aims to solve the problems that an MXenes material is easy to agglomerate when being compounded with a catalyst and thus cannot be uniformly distributed in the catalyst. The preparation method comprises the following steps: by taking titanium aluminum carbide as a raw material, and concentrated hydrochloric acid and lithium fluoride as etching agents, performing etching and ultrasonic treatment so as to prepare a uniformly dispersed thin-layer Ti3C2 solution; by taking bismuth nitrate pentahydrate and potassium bromide as raw materials, ethylene glycol as a solvent, and a mixed solution of the thin-layer Ti3C2 solution and ammonium hydroxide as a reaction liquid, performing an alcoholysis method, so as to obtain the Bi4O5Br2 / thin-layer Ti3C2 composite photocatalyst at a normal temperature. The degradation activity ofthe catalyst upon organic matters and the photocatalytic hydrolysis hydrogen production efficiency can be remarkably improved. In addition, the method can be implemented at a normal temperature, is simple and feasible and has great significances for environment treatment and green energy utilization.

The invention relates to the technical fields of nucleation of a metal oxide nanometer catalyst, growth control, doping modification, environmental catalytic purification, micro-arc oxidization, nanometer materials and nano-technologies, in particular to an in-situ growth and doping modification method for the metal oxide nanometer catalyst. According to the in-situ growth and doping modificationtechnology for the metal oxide nanometer catalyst, a micro-arc oxidization method is mainly utilized for directly growing a metal oxide nanometer catalyst material on the surface of a metal substrate,and the metal oxide nanometer catalyst material is subjected to doping modification. The prepared metal oxide nanometer catalyst is good in crystallinity, large in active area, relative uniform in size, uniform in growth and distribution, and applicable to the fields of automobile tail gas treatment, denitration and desulfurization treatment, industrial waste gas treatment, CO catalytic oxidization and relevant environmental catalytic purification.

The invention provides a preparation method of a parallel-arranged SiO2 nanowire. In the whole process of the method, SiO nanopowder is used as a reaction source, and reacts in a high temperature zoneof a one-dimensional high temperature tubular furnace under a low vacuum environment, and is deposited on a low temperature zone of a silicon wafer substrate along with the circulation of a protective gas. The method has high yield, simple operation, safety and environmental protection, and low cost, has no need to add a catalyst, and can be completed by a chemical reaction at a high temperature.The SiO2 nanowire prepared by the method has a parallel arrangement structure, and the unique novel structure has important academic significance and application for developing new fields of materialproperties.

The invention discloses a novel Polymer-COF-rGO composite membrane and a preparation method thereof. The preparation method comprises the steps that firstly, a COF monomer containing a polymer is prepared from a COF monomer and a linear Polymer, then the COF monomer, another COF monomer containing an amino group and graphene oxide (GO) are mixed and ground, DMF and acetic acid are added, then a heating reaction is conducted, and the novel Polymer-COF-rGO composite membrane is formed. In the synthesis reaction, two COF monomers form a COF material, added graphene oxide (GO) is reduced in-situ in a DMF solution and forms a covalent bond with amino in the COF material to be connected between rGO and COF at the same time under the heating condition, and in-situ growth of an rGO (reduced graphene oxide) membrane layer on the COF membrane layer is achieved. Due to the fact that the Polymer and the COF membrane layer are connected through covalent bonds, and the COF and the rGO membrane layer are connected through covalent bonds, the two types of 2D materials are effectively and tightly combined together, a bridging effect is achieved, and separation of COF photo-induced charges and migration of photo-induced electrons to rGO are improved.

A preparation method of a graphene-loaded Alpha-FeOOH sandwiched sheet layer-structure lithium ion battery negative electrode material comprises the steps of dispersing graphene oxide in deionized water to obtain a suspension liquid A; adding a ferric nitrate salt into the deionized water, and mixing with the suspension liquid A to obtain a suspension liquid B; pouring the suspension liquid B into a homogeneous phase hydrothermal reaction kettle, sealing the reaction kettle, placing the suspension liquid B in a homogeneous phase hydrothermal reaction instrument for hydrothermal reaction and naturally cooling to a room temperature to obtain a product C; respectively washing the product C with water and alcohol, and dispersing the washed product in the water to obtain a product D; and freezing and drying the product D to obtain the sandwiched sheet layer-structure graphene-loaded Alpha-FeOOH compound. Since graphene is good in conductivity and has relatively large specific area, the conductivity of Alpha-FeOOH can be remarkably improved by loading the graphene, the dispersion performance of the Alpha-FeOOH is simultaneously improved, and agglomeration is prevented. An ultrasonic assistant method and a homogeneous phase hydrothermal method are combined, the material conductivity is improved by combining the Alpha-FeOOH and the graphene, the electrochemical performance is improved, so that the battery is more stable in structure, and the cycle stability of the battery is improved.

The invention belongs to the field of low-dimensional nanomaterials and particularly relates to a preparation method of a vertical cross SiO2 nanorod. The preparation method comprises the following steps: putting SiO powder in a high-temperature area of a furnace center by using a thermal evaporation method without a metal catalyst; collecting a substrate, and also putting the substrate in the high-temperature area; filling a furnace chamber with argon, raising the temperature of a central area of a tube furnace to 1050 to 1150DEG C, and insulating for 3 to 4hrs; after the insulation time is reached, growing the vertical cross SiO2 nanorod on the growth substrate. The preparation method disclosed by the invention has the advantages of environment friendliness, safety, simple method, quick response, no pollution, low cost, high purity of a sample and the like. The prepared vertical cross SiO2 nanorod has great application potential in the fields of medicine, filtering, catalysis, light absorption, novel materials and the like.

The invention discloses a nano composite material simultaneously modified by a non-noble metal cocatalyst and defects as well as a preparation method and application thereof. The nano composite material is characterized in that 2D non-noble metal cocatalyst Ni12P5 nanosheets are uniformly loaded on a 3D spherical hierarchical structure assembled by 2D porous ZnIn2S4 nanosheets modified by zinc defects VZn. The photocatalyst prepared by the invention shows excellent activity, selectivity and stability for preparing benzaldehyde and hydrogen by catalyzing benzyl alcohol with visible light, and the preparation method is simple and convenient in steps, mild in reaction conditions and high in yield.

The invention provides a method and device for growing multilayer heterojunctions through CVD. According to the method, a CVD device is firstly used for growing a hexagonal boron nitride thin film on copper foil; and through a transmission device in the CVD device, new copper foil is moved to a high temperature growing zone for catalyzing carbon source for growing a graphene thin film. The above processes are repeatedly executed, and any multilayer boron nitride / graphene heterojunctions are obtained.

The invention discloses an ionic metal ink for ink-jet printing preparation of a copper circuit graph on a printed board surface and its preparation method and printing method. The ionic metal ink is used for treatment on the printed board surface. The ionic metal ink solves the problem that the existing nano-copper conductive ink has poor stability, needs sintering aftertreatment and can be oxidized and agglomerated easily in the sintering. The preparation method of the ionic metal ink comprises that a bio-adhesive monomer, a metal salt, a metal complexing agent, deionized water and a pH buffering agent are mixed and undergo a reaction; the reaction products are added with a surface tension conditioning agent and a viscosity conditioning agent; and a pH value of the mixture is adjusted to 4-6. The printing method adopting the ionic metal ink comprises that the printed board surface is subjected to chemical degreasing and corona treatment; the ionic metal ink is spray-printed on the printed board surface to form circuit graphs composed of the ionic metal ink; the circuit graphs are dried at a low temperature; and the printed board surface with the circuit graphs is put into a chemical copper-plating solution for in-situ growth so that the copper circuit graphs are obtained. The printing method can be used for the technical field of printed electronics.

The invention relates to an antibacterial wood-plastic composite material based on in-situ growth of nano silver and a preparation method of the antibacterial wood-plastic composite material. The antibacterial wood-plastic composite material includes: 10-45 parts of silver-loaded plant fiber powder, 40-88 parts of polyolefin resin, 1.8-13 parts of a polymer modifier and 0.2-2 parts of an antioxidant. According to the preparation of the silver-loaded plant fiber powder, the porous structure and reducing groups rich in plant fiber powder are used, a silver precursor is uniformly adsorbed throughthe aid of the porous structure and then reduced to nano-silver in situ by the reducing groups, and meanwhile, the nano-silver is assisted by the porous structure to achieve uniform load. The methodis simple and easy to implement, only involves traditional wood-plastic technology, and does not require special equipment, the porous structure and chemical composition of the plant fiber powder areused to achieve in-situ growth and uniform loading of the nano-silver, the additional using of reducing agents is avoided, the problem of prone agglomeration of the nano-silver is solved, improving ofthe antibacterial rate of wood-plastic composites is facilitated, and the application fields are broadened.

The invention relates to a preparation method of a Cf-HfCnw micronano multiscale toughened carbon matrix composite. The preparation method comprises the following steps: soaking a low-density C / C composite with the density of 0.7-1.0 g / cm<3> in a nickel nitrate ethanol solution, wherein generation of unnecessary change of state is avoided in the drying process; adding a 0.01-1% peroxide as an initiator to initiate the cross-linked polymerization of a precursor PHC and divinyl benzene; and successively preparing an HfC nanowire on the surface of the low-density C / C composite by adopting a precursor conversion method to realize the toughing of the carbon matrix composite on the micronano scale to obtain the Cf-HfCnw micronano multiscale toughened carbon matrix composite. The large-scale in-situ growth of the HfC nanowire on the surface of the low-density C / C composite is realized, and the effectively control to the appearance and the purity of the HfC nanowire can be realized.

The present invention relates to ceramic material, is alpha-Sialon composite ceramic material and its preparation process, and aims at solving the problem that residual glass phase in alpha-Sialon ceramic degrades the high temperature performance obviously. The alpha-Sialon composite ceramic material of the present invention has BAS in 0.1-30 wt% as additive to create self-toughened alpha-Sialon material, and is prepared through a powder metallurgy process. The present invention adds barium feldspar glass ceramic to Sialon ceramic to realize the in-situ growth of rod-shaped alpha-Sialon crystal grain and the complete crystallization of barium feldspar and to synthesize alpha-Sialon material with excellent performance, especially bending strength not degrading up to 1500 deg.c.

The present invention relates to ceramic material, is alpha-Sialon composite ceramic material and its preparation process, and aims at solving the problem that residual glass phase in alpha-Sialon ceramic degrades the high temperature performance obviously. The alpha-Sialon composite ceramic material of the present invention has BAS in 0.1-30 wt% as additive to create self-toughened alpha-Sialon material, and is prepared through a powder metallurgy process. The present invention adds barium feldspar glass ceramic to Sialon ceramic to realize the in-situ growth of rod-shaped alpha-Sialon crystal grain and the complete crystallization of barium feldspar and to synthesize alpha-Sialon material with excellent performance, especially bending strength not degrading up to 1500 deg.c.

The invention discloses a preparation method of a cobalt nickel sulfide-MXene electrode material for a supercapacitor, and belongs to the technical field of capacitor electrode material preparation. The preparation method comprises the following steps: (1) preparation of a thin MXene nanosheet layer, (2) preparation of an MXene-MOF precursor material, and (3) preparation of a finished product electrode material. The invention provides the preparation method of the cobalt nickel sulfide-MXene electrode material for the supercapacitor, and the method overcomes the limitation of poor conductivity of the cobalt nickel sulfide, so that the conductivity and cycling stability of the cobalt nickel sulfide are greatly improved under the condition that the material has large specific capacitance.

The invention discloses a preparation method and application of a CeOx / MC nanosheet material, and the preparation method is carried out according to the following steps: (1) removing shells of dry corn straws, crushing into small particles, placing and stirring the small particles in an acid solution, washing with deionized water to be neutral, and carrying out filtering and drying to obtain a biomass carbon raw material; (2) weighting cerium salt and dissolving the cerium salt in deionized water, carrying out stirring to enable the cerium salt to be completely dissolved to obtain a 10-100 mMcerium salt solution; (3) putting the biomass carbon raw material into a cerium solution, carrying out ultrasonic treatment, vacuum treatment and secondary ultrasonic treatment, filtering and drying;and (4) roasting the product dried in the step (3) in an argon atmosphere at 600-900 DEG C to obtain the CeOx / MC nanosheet material. The invention provides an application of the prepared CeOx / MC nanosheet material as a positive electrode catalyst material of a lithium-oxygen battery. According to the invention, large-scale controllable preparation of the CeOx / MC nanosheet is realized, and CeOx hasrich oxygen vacancies, ultra-small grain size and high load capacity, so that the CeOx / MC nanosheet shows excellent lithium-air battery catalytic performance.

The invention discloses a preparation method of a graphene-loaded iron oxide self-assembly mulberry-like structure negative electrode material of a lithium-ion battery. The method comprises the steps of dispersing graphene oxide into ethanol to prepare a suspension A; adding ferrous chloride to deionized water and then mixing with the suspension A to obtain a mixed solution B; pouring the mixed solution B into a heterogeneous hydrothermal reactor for hydrothermal reaction, after the reaction is completed, naturally cooling to a room temperature to obtain a product C; carrying out washing and alcohol washing on the product C separately, dispersing the washed product into water to obtain a product D; and freezing the product D until no liquid exists, and then putting the product D into a freezing dryer to obtain a dried sample, namely the final graphene-loaded iron oxide self-assembly mulberry-like structure negative electrode material of the lithium-ion battery. In-situ growth of iron oxide on the graphene surface is achieved to form a graphene-loaded structure by using coordination of a ferric salt and the graphene oxide; and the preparation method is simple in experimental method, low in cost and easy to implement.

The invention discloses preparation and applications of a CeOx / RuO2 / MC composite nanosheet and a CeOx / RuO2 composite nanosheet material. The preparation method comprises the following steps: (1) removing hard shells from waste corn straws, crushing into small particles, carrying out acid treatment, washing with deionized water to be neutral, filtering, and drying to obtain a biomass carbon raw material; (2) preparing a mixed solution of a cerium salt and a ruthenium salt; (3) putting the biomass carbon raw material into the mixed solution, dipping, sequentially carrying out ultrasonic treatment, vacuum treatment and ultrasonic treatment again in the dipping process, then filtering, and fully drying; (4) roasting the dried product in argon to obtain a CeOx / Ru / MC composite nanosheet; and (5)roasting the CeOx / RuO2 / MC composite nanosheet in air to obtain a CeOx / RuO2 / MC composite nanosheet or a CeOx / RuO2 composite nanosheet material. The invention provides applications of the CeOx / RuO2 / MCcomposite nanosheet material or the CeOx / RuO2 composite nanosheet material as a positive electrode catalyst material of a lithium-oxygen battery, wherein the CeOx / RuO2 / MC composite nanosheet materialor the CeOx / RuO2 composite nanosheet material has relatively high catalytic activity, and the OER reaction overpotential can be greatly reduced.

The invention relates to a preparation method of an activated carbon-titanium dioxide composite material, and belongs to the field of nano composite materials. Biomass charcoal is used as a raw material to prepare activated carbon (AC), and the TiO2 and the activated carbon are connected through chemical bonds by utilizing biomimetic mineralization loaded nano TiO2 which is mild in biomimetic mineralization reaction condition, normal in temperature and pressure, green, environment-friendly and low in energy consumption, so that the TiO2 can be immobilized, solid-liquid separation is easy, recycling is convenient, and the adsorption performance of the activated carbon can be utilized to adsorb and enrich organic pollutants in the wastewater to the surfaces of TiO2 crystal grains, so that the contact probability of the catalyst and the pollutants is increased, the photocatalytic efficiency of the composite material is improved, and the degradation rate is increased. The synergistic effect of TiO2 and AC is utilized, and important social benefits and ecological benefits are achieved for saving energy, promoting biomass resource utilization and protecting the environment. The preparation method disclosed by the invention is simple in process, mild in reaction condition, low in cost and environment-friendly, and a new strategy is provided for photocatalytic degradation of pollutants.

The invention belongs to the field of nanometer materials, and discloses a SiO2 irregular nanocrystal network structure and a preparation method thereof. The method comprises the following steps: with SiO2 powder and S powder as reaction sources, carrying out a reaction in a high-temperature area of a high-temperature tube furnace of a low vacuum system, and carrying out depositing with carrier gas onto the low-temperature area of a silicon-chip substrate. The method provided by the invention has the advantages of simple operation, high yield, low cost, safety, environmental protection and no need of any catalyst, and can be completed through a chemical reaction under the condition of high temperature. The SiO2 irregular crystal nanometer network prepared by utilizing the method provided by the invention has a mesoporous structure and facilitates to transfer and transportation of substances; meanwhile, due to a special structure of the SiO2 irregular crystal nanometer network, important academic significance and application in a novel field of development of material properties are obtained.

The invention provides a method for in-situ preparation of a nano-enzyme membrane. The method comprises pretreating an original membrane, carrying out grafting polymerization on the membrane surface,carrying out coordination self-assembling and in-situ growth on the nano-enzyme on the membrane surface, immersing the membrane grafted with polyacrylic acid in a MOFs precursor solution for some timeso that metal ions in the precursor solution and the carboxyl group of polyacrylic acid are assembled to the membrane surface through coordination, adding an organic ligand solution and an enzyme liquid into the precursor solution so that the enzyme is wrapped by the MOFs skeleton structure and the in-situ growth of the nano-enzyme on the membrane surface is realized, and carrying out after-treatment on the nano-enzyme membrane so that the nano-enzyme membrane with the nano-enzyme is obtained. The method greatly improves enzyme activity and stability, improves the loading rate of the enzyme on the membrane, reduces the water contact angle of the original membrane, realizes high water flux and provides the polymer membrane with pollution resistance, biocatalysis, photocatalytic degradationof pollutants and other functions.