771results about How to "Meet the requirements of green chemistry" patented technology

The invention relates to a preparation method of microsphere with surface functional group and controllable functionality, and to the field of nano-technology. The invention firstly uses the microsphere with the surface having ionic functional group as a starting shuttering to coat layer of layer the nano-particle with certain functionality or polyelectrolyte by the power of static electrification to obtain the composite microsphere with surface functional group and controllable functionality. The microsphere with surface functional group and controllable functionality prepared by the invention, of which the size is controllable, has single functionality or multiple functionality, can respond to the circumstance of magnetism, light and pH value, and the response intensity is controllable. Furthermore, the surface can have different functional groups. The invention can get an extensive use in the fields of biology medical carrier, bioanalysis and intelligent material, etc.

The invention relates to a divalent metal ion pre-embedded layered vanadium oxide nanometer material as well as a preparation method thereof. The chemical formula of the nanometer material is AxV2O5-y, wherein A is Mg, Ca, Sr or Zn; the MgxV2O5-y has the nanoribbon diameter of 100-1500nm and the length of 5-50 microns or CaxV2O5-y has the nanoribbon diameter of 100-1000nm and the length of 5-50 microns or SrxV2O5-y has the nanoribbon diameter of 100-1000nm and the length of 5-50 microns or ZnxV2O5-y has the nanoribbon diameter of 100-300nm and the length of 5-50 microns or ZnxV2O5-y has the nanoflower diameter of 3-5 microns. The divalent metal ion pre-embedded layered vanadium oxide nanometer material disclosed by the invention has high specific capacity, excellent cycling stability and excellent rate capability and is a potential high-performance commercial zinc ion battery positive electrode material.

The invention discloses an amidoxime spherical lignin chelate adsorbing resin and a preparation method thereof. A spherical lignin bead is prepared by adopting reversed-phase suspension polymerization techniques of programmed heating, crosslinking and solidification and taking concentrated pulping black liquor or concentrated pulping red liquor as a raw material. The spherical lignin bead is grafted with copolymerized acrylonitrile through further amidoxime to obtain the spherical lignin chelate adsorbing resin which has the grain-size average pore size of 5-150nm, the uniformity coefficient of not more than 1.30, the specific surface area of 30-480m<2> / g, the water content of 55-75%, the bulk density of 0.60-0.73g / ml, the bulk volume of 2.25-5.80ml / g, the amidoxime group content of 6.51-15.85mmol / g and the chelate adsorption capacity of 5-15 mmol / g. The method of the invention is simple for operation, has low production cost, is expected to be of value in the practical application to the enrichment recovery of noble metals and the extraction of uranium from seawater.

The invention discloses a method for preparing manganese molybdate / cobalt molybdate hierarchical heterostructure nanowires. The method comprises the following steps of: preparing a NaMoO4 aqueous solution and a MnCl2aqueous solution; proportioning in a certain ratio of the NaMoO4aqueous solution to the MnCl2 aqueous solution to CTAB (Cetyltrimethyl Ammonium Bromide) to n-butyl alcohol to isooctane and preparing manganese molybdate nanorods by using a microemulsion method; adding the manganese molybdate nanorods into distilled water, stirring and ultrasonically cleaning to obtain transparent liquid; and adding the liquid into a flask, placing the flask in an oil bath of between 60 and 80 DEG C, condensing and refluxing, adding a CoCl2 solution and a Na2MoO4 solution with different concentrations in turn every certain time, stirring to react so as to obtain a product, separating and drying the product to obtain the manganese molybdate / cobalt molybdate hierarchical heterostructure nanowires, wherein the lengths of the nanowires reach 10 microns and the diameters of the nanowires are between 500 and 1,000nm; the manganese molybdate nanorods in the hierarchical heterostructure nanowires are used as a main material and the diameters of the manganese molybdate nanorods are between 300 and 500; and the cobalt molybdate is branch nanorods which orderly grow on the surfaces of the manganese molybdate nanorods and the diameters of the cobalt molybdate nanorods are between 30 and 50nm. The material has excellent electrochemical performance and can be used as an active material for electrodes of electrochemical super capacitors. The method has the advantages of low-cost raw materials, simple process and environmental friendliness.

The invention relates to a mesoporous nanosheet structure ferronickel selenide material supported on carbon fiber cloth and a preparing method. The mesoporous nanosheet structure ferronickel selenide material can serve as a brine electrolysis catalytic oxygen evolution active material, ferronickel selenide mesoporous nanosheets are staggered and linked on carbon nanofibers to form a three-dimensional network structure, the ferronickel selenide mesoporous nanosheets are 1-3 micrometers long and 25-45 nanometers thick, and the diameter of the carbon nanofibers is 10-13 micrometers. The mesoporous nanosheet structure ferronickel selenide material has the advantages that the mesoporous nanosheet structure ferronickel selenide material supported on the carbon fiber cloth and serving as an oxygen evolution electrode has excellent catalytic activity and stability and is a potential application material for a high-catalytic-performance brine electrolysis catalytic oxygen evolution catalyst. The reaction conditions are mild, based on the unique advantages of a mesoporous structure and selenide, a controllable secondary hydrothermal method is adopted, and by changing the hydrothermal time, the mesoporous material supported on the carbon fiber cloth is prepared and meets the requirement of green chemistry; the requirement for equipment is low, which is beneficial for marketization popularization.

The invention relates to a sodion-embedded manganese dioxide nanometer sheet electrode as well as a preparation method and an application of the electrode. The electrode can be used as the active material of a supercapacitor and comprises sodion-embedded manganese dioxide nanometer sheets evenly distributed on the surface of a foamed nickel substrate. The preparation method comprises the following steps of: (1) mixing sodium sulfate and manganese acetate to prepare an electrochemical deposition precursor solution; (2) setting up an electrochemical deposition platform through a three-electrode method and taking the foamed nickel substrate after pretreatment as a working electrode, a platinum electrode as a counter electrode and a saturated calomel electrode as a reference electrode; (3) soaking the electrodes in the electrochemical deposition precursor solution at same depth; (4) opening an electrochemical workstation, setting the working electrode to the anode, setting the working mode to a timing potential mode, and starting up the electrochemical workstation; (5) taking out and washing the working electrode after the electrochemical workstation stops working; and (6) drying to obtain the sodion-embedded manganese dioxide nanometer sheet electrode. The sodion-embedded manganese dioxide nanometer film electrode as well as the preparation method and the application of the electrode disclosed by the invention have the characteristics of simple technique, mild reaction condition and excellent electrochemical performance of materials.

The invention relates to a sodium vanadyl phosphate symmetrical sodium-ion battery material of which the morpholog is granular, tubular and lamellar, the sodium vanadyl phosphate nano particle size is 60-90nm, the sodium vanadyl phosphate nanotube is 20-30nm in diameter and is wound together in a curled manner, the sodium vanadyl phosphate nanosheet is 150-200nm in thickness and 5-6mum in length and width. The sodium vanadyl phosphate symmetrical sodium-ion battery material can be applied as the active material of the sodium-ion battery. The sodium vanadyl phosphate symmetrical sodium-ion battery material has excellent multiplying power, high specific capacity and good circulating stability when being used as the active material of the sodium-ion battery, and the whole battery has good circulating and multiplying power performances when the sodium vanadyl phosphate nano particles are used as the cathode and the anode of the battery; the process is simple, economical and practical.

The invention relates to graphene curled molybdenum trioxide nano-ribbons, and a preparation method and an application thereof. The nano-ribbons can be used as a lithium ion battery positive electrode material. The method comprises the steps that: (1) a molybdenum sol is prepared, wherein excessive hydrogen peroxide solution is weighed and placed into a beaker; molybdenum powder is slowly added into the hydrogen peroxide, wherein the entire process is carried out under a cold water bath; when the molybdenum powder is completely added, the materials are stirred, such that molybdenum sol is obtained; (2) a graphene dispersion prepared with a Hummer method and the molybdenum sol prepared in the step (1) are weighed and are stirred under water bath; the mixture is transferred to a reaction kettle, and is subjected to a hydrothermal reaction in a thermostat; the material is naturally cooled to room temperature; (3) the product obtained in the step (2) is washed by using anhydrous ethanol, and is dried in a drying oven. The nano-ribbons and the method have the advantages that: when the material is adopted as a lithium ion battery positive electrode material, excellent rate performance, high specific capacity, and good circulation stability are shown. The process is simple and economical.

The invention provides an electrolyte for a lithium secondary battery, the electrolyte includes a material which can be reacted with a corrosion matter on the surface of a negative electrode of the lithium secondary battery to form a silicon-containing protection layer, and the lithium secondary battery includes a lithium-oxygen secondary battery or a lithium-sulfur battery. According to the characteristic that corrosion matter lithium hydroxide is formed inevitably on the lithium surface of the lithium secondary battery of the opening system, a silicate material and / or silane material are / is added in the electrolyte, and the silicate material and / or the silane material are / is easy to react with the lithium hydroxide to form a silicon-containing protection film, further erosion of the lithium negative electrode can be effectively prevented, and with the charge and discharge, silicate / silane in the electrolyte can dynamically repair of the protective film, namely, growth of the protection film is continued on the corroded lithium surface, in the circulating charge and discharge process, the lithium negative electrode can be dynamically protected in real time in situ, the effect is better, the protective layer is more compact, metal lithium corrosion can be effectively reduced, and the metal lithium reversibility can be significantly improved.

The invention discloses a method for preparing (Z)-5-amino-alpha-(ethoxy imino group)-1, 2, 4-thiadiazole-3-acetic acid. The method comprises steps of firstly, carrying out oximation reaction on malononitrile and sodium nitrite under the action of acetic acid so as to obtain a compound A, then carrying out Williamson synthesis on the compound A and bromoethane or diethyl sulfate under alkaline condition, so as to obtain a compound B, then carrying out amidine reaction on the compound B and ammonia water, so as to obtain a compound C, carrying out cyclization reaction on the compound C and potassium rhodanide for ring closing so as to obtain a compound D, and finally, hydrolyzing the compound D under the action of a strong base, so as to obtain (Z)-5-amino-alpha-(ethoxy imino group)-1, 2, 4-thiadiazole-3-acetic acid. The method has few synthesis steps, has low cost, uses the materials which are cheap and easy to obtain, is beneficial to industrial production, and has light contamination; the purity of the product can reach 99%, so that synthesis of high-purity ceftaroline fosamil in the subsequent step is guaranteed.

The invention belongs to the technical field of chemical synthesis, and in particular relates to a method for preparing 3-ethoxy ethyl propionate. The method comprises a synthesizing step and a refining step, wherein the synthesizing step adopts ethanol and ethyl acrylate as raw materials to carry out addition under the action of a catalyst, and the catalyst adopts alkali metal or alkali alcoholate. The method has the following advantages: 1, the method adopts one of the raw materials as solvent to react, so as to reduce solvent recovery and consumption in the production process; 2, the reaction catalyst uses basic catalyst such as sodium metal and the like, so as to improve reaction yield greatly; 3, the dosage of the reaction catalyst is reduced to about 2 percent, so as to lower amount of salt greatly after the reaction is finished, and reduce byproducts; 4, the reaction time can be shortened to 3 hours, so as to improve production efficiency; and 5, fore zeolite obtained in distillation can be used for next reaction, so as to achieve circular application, so that the proposal reaches green chemical requirement.

The preparation process of photocatalytic titania fiber material includes the following steps: synthesizing polyacetyl ethyl acetate-titanium complex as the precursor; dissolving the synthesized polyacetyl ethyl acetate-titanium complex in tetrahydrofuran to compounding spinning liquid of viscosity 5-100 Pa.s, with the ratio between the synthesized polyacetyl ethyl acetate-titanium complex and tetrahydrofuran being 100 g to 400-800 ml; centrifugally spinning the spinning liquid of viscosity 5-100 Pa.s into short precursor fiber; dry spinning the spinning liquid of viscosity 50-100 Pa.s into continuous long precursor fiber; and final water steam activation of the precursor fiber and heat treatment and sintering. The preparation process has simple operation, easy control and low power consumption.

The invention relates to a method for realizing selective N-methylation of primary amine, which comprises the following steps: in a nitrogen gas protective atmosphere or in the air, adding a primary amine derivative, a metal iridium or ruthenium complex, methanol and alkali into a reaction vessel; reacting the reaction mixture at 100-150 DEG C for several hours, and then cooling to room temperature; and performing rotary evaporation to remove the solvent, and then performing column separation to obtain a target compound. Compared with the prior art, the reaction shows the following remarkable advantages: 1) the methanol is used as an alkylation agent, thereby avoiding the use of virulent haloalkane and dimethyl sulfate; 2) the reaction only generates water as the byproduct, thereby causing no environmental hazard; 3) the reaction is high in atom economy; 4) the reaction shows absolute selectivity, and the reaction only generates mono-methyl products and generates no bis-methyl products; and 5) the reaction shows wide substrate universality and is effective for various primary amine derivatives.

The invention discloses a synthetic method for aromatic[a]carbazole compounds, belonging to the technical field of organic synthesis. According to a technical scheme in the invention, the synthetic method comprises the following steps: dissolving a 2-phenylindole compound, 2-(naphth-1-yl)indole compound or 2-(thiazol-1-yl)indole compound and a diazo compound in a solvent together; then adding a catalyst and an additive; and carrying out a reaction at 100 to 140 DEG C so as to prepare a benzo[a]carbazole compound, naphtho[a]carbazole compound or thiazolo[a]carbazole compound. According to the invention, 2-substituted indole compounds and the diazo compound are used as raw materials and subjected to a one-pot cascade reaction so as to directly obtain the aromatic[a]carbazole compounds; and the synthetic method is simple and convenient in process, mild in conditions, wide in a substrate adaptability range and suitable for industrial production.

The invention belongs to the technical field of the chemical industry, which relates to a load type nano gold catalyst for preparing lactone by catalyzing air oxidation alpha, omega-diol. The invention adopts nano iron oxide as a carrier of a gold catalyst, the iron oxide is synthesized by a hydrothermal method, and nano iron oxide carriers with different crystal types and patterns can be preparedby calcination. The gold catalyst is prepared by a precipitation settling method, the prepared catalyst has small gold particles and good dispersivity, the interaction of gold and the carrier is strong, the gold catalyst represents an excellent activity in the preparation of gamma-butyrolactone by the direct oxidation of 1,4-butanediol through catalyzing air and the preparation of delta-valerolactone by oxidizing 1,5-pentanediol and conforms to the requirement of green chemistry, and the generation of lactone by oxidizing alpha, omega-diol in one step is realized. A magnetic iron oxide carrier can be obtained by selecting a proper preparation method, and the invention is convenient to separate and recover the catalyst and has better industrial application prospect.

The invention discloses a graphite alkenyl supermolecule hybridization material with strengthened heat stability and a preparation method thereof. The graphite alkenyl supermolecule hybridization material with strengthened heat stability is in a nanometer structure constructed on the basis of supermolecule self-package technique. The preparation process includes three steps of graphite oxide preparation, reduced graphene oxide preparation and graphite alkenyl supermolecule hybridization material preparation. Relative to unmodified reduced graphene oxide, the hybridization material combined inthe method can be easily dispersed in organic solvent with low polarity and the heat stability is greatly improved. Simultaneously, the hybridization material can serve as a nanometer material to improve the heat stability of a polymer composite material. The combining steps are simple and high in efficiency, so that the hybridization material can be prepared in a large amount and has better application prospect and economical benefit.

The invention relates to a vanadium oxide ultra-thin nanobelt with embedded ions and a preparation method thereof. The vanadium oxide ultra-thin nanobelt can be used as positive electrode active materials, with good rate capability, of a sodium-ion battery, metal ions are embedded into crystal layer-shaped structural layers of vanadium oxide, the interlayer spacing is controlled to range from 9.6 angstroms to 10.9 angstroms, the length of the vanadium oxide ultra-thin nanobelt ranges from 10 microns to 100 microns, the width of the vanadium oxide ultra-thin nanobelt ranges from 0.5 micron to 3 microns, and the thickness of the vanadium oxide ultra-thin nanobelt ranges from 5 nanometers to 20 nanometers. The vanadium oxide ultra-thin nanobelt with the embedded ions and the preparation method thereof have the advantages that based on the synergistic effect between the ultra-thin nanobelt structure and the metal ions embedded into the crystal structural layers, the vanadium oxide ultra-thin nanobelt material with the embedded ions is synthesized through the hydrothermal process and the freeze drying and vacuum drying processes; when the vanadium oxide ultra-thin nanobelt with the embedded ions is used as the positive electrode active materials of the sodium-ion battery, the excellent cycling property and high-rate capability of the nano material are achieved, and the vanadium oxide ultra-thin nanobelt with the embedded ions is a high-performance potential application material for the sodium-ion battery; the technology is simple, the requirements of green chemistry are met, and the requirement for equipment is low.

The invention relates to a preparation method of a Prussian blue flower-like nano-structure electrode material. The preparation method comprises the following steps: 1) firstly, dissolving nickel chloride hexahydrate and anhydrous sodium citrate into de-ionized water; 2) dissolving sodium ferrocyanide decahydrate into de-ionized water; 3) pouring a solution of step 2) into a mixed solution obtained by step 1) and uniformly stirring to obtain a mixed solution; 4) standing the mixed solution obtained by step 3); 5) centrifuging and collecting sediment; washing the sediment for several times; drying in vacuum to obtain Prussian blue precursor powder; 6) adding the precursor powder into a sodium hydroxide solution and carrying out ultrasonic treatment; 7) centrifuging and collecting a product and washing; drying in vacuum to obtain light green powder, namely the Prussian blue flower-like nano-structure electrode material. The preparation method provided by the invention has the beneficial effects that the specific surface area is remarkably enlarged so that reaction sites of electrolyte and the electrode material are effectively increased and an ion diffusion distance is reduced; when the Prussian blue flower-like nano-structure electrode material is used as a positive electrode active material of a sodium ion battery, the material has the characteristics of high power and good cycling stability.

The invention discloses a preparation method for substituted indole and isoquinoline, and belongs to the technical field of organic chemical synthesis. By adopting oxygen as an oxidizing agent and various substituent substituted alkyne and arylamine or hydrazone as an initial raw material, the method obtains compounds containing indole and isoquinoline structures by virtue of transition metal catalysis. The reaction raw materials, the oxidizing agent and the catalyst are low in price and are easily available, and the synthetic process is simple, so that the synthetic cost is greatly lowered; the reaction condition is mild, the yield is high, and industrialization is facilitated; The reaction raw materials and the catalyst are clean and non-toxic, so that the environmental pollution is less. The compounds and derivatives as important fine chemicals are widely applied to the fields of medicines, pesticides, spices, photoelectricity and the like.

The invention provides a direct methanol fuel cell anode catalyst Pt / MnO2-RuO2 / CNTs and a preparation method thereof. The preparation method comprises the following steps of: adding carbon nano tube and ruthenium trichloride into water, performing ultrasonic dispersion, slowly adding potassium permanganate solution into the solution at room temperature with intense stirring, performing heating reflux on the solution, and performing filtration, washing and drying after the reaction to obtain MnO2-RuO2 / CNTs; and dispersing the prepared MnO2-RuO2 / CNTs into ethylene glycol, adding chloroplatinic acid solution into the solution, adjusting the pH value of the solution, performing heating reflux to react the solution, and filtering, washing and drying the reaction product to obtain the Pt / MnO2-RuO2 / CNTs catalyst. The method has the advantages of simple process, mild operation conditions, low cost and easy expanded production; and the catalyst prepared by the method has high electro-catalysis and oxidation activity of methanol and excellent CO poisoning resistance.

A process for preparing solid sulfonic acid from the regeneratable vegetative raw material, such as wood bits and bamboobits, includes such steps as drying the vegetative raw material containing cellulose and lignin, breaking, proportionally mixing it with sulfuric acid, stirring at 40-200 deg.C for 1-20 hr, cooling, washing with deionized water until it becomes neutral, baking, proportionally adding sulfonating agent, sulfonating at 30-150 deg.C for 1-20 hr, cooling, washing with deionized water until it becomes neutral, testing no deposition in BaCl2 solution, and baking.

The invention relates to a gold-sliver alloy two-dimensional ordered nano film prepared by in-situ interface transformation and a method for preparing the gold-sliver alloy two-dimensional ordered nano film. The method adopting a two-step transformation process comprises the following steps: by taking a single-layer polystyrene sphere self-assembled film as a template, preparing a polystyrene-silver nano net film with a controllable thickness by a gas slow release method; transferring the polystyrene-silver nano net film to a solution surface of a chloroauric acid and disodium hydrogen phosphate solution, and obtaining the gold-sliver alloy two-dimensional ordered nano film by carrying out in-situ replacement reaction; and finally, soaking the gold-sliver alloy two-dimensional ordered nano film to remove the polystyrene template. The synthetic method has the advantages of being simple, quick, gentle and low in energy consumption, and meets the requirements of green chemistry; the smallest constitutional unit of the prepared gold-sliver alloy two-dimensional ordered nano net film is a hollow gold-sliver alloy nano particle; and the film has the advantages of being great in specific surface area, good in permeability, low in density and the like, can be loaded on substrates of different types, has the advantages of being convenient to recycle, and easy to enlarge a product, and can be widely applied to the fields of photoelectrocatalysis, biosensing, biological medicine carrying and the like.

The invention relates to a graphene-modified vanadium disulfide micrometer flower material and a preparation method thereof. The graphene-modified vanadium disulfide micrometer flower material can be used as an aluminum ion battery cathode active material, and has a micrometer flower laminated structure which is self assembled by vanadium disulfide nanometer sheets, wherein graphene is uniformly distributed in the micrometer flower laminated structure, an interlayer distance of the micrometer flower laminated structure is shown in the description, and the diameter of a micrometer flower is 1-1.5 microns. The graphene-modified vanadium disulfide micrometer flower material and the preparation method thereof have the beneficial effects that the novel laminated graphene-modified vanadium disulfide electrode material is prepared through a one-step hydrothermal method, expresses high specific capacity, good cycle performance and good coulombic efficiency by larger interlayer distance of the vanadium disulfide and uniform interlayer modification on graphene when being used as the aluminum ion battery cathode active material, and is a potential application material of an aluminum ion battery; and secondly, the preparation method has the advantages of simple process, short synthesis time and mild conditions, meets the requirement on green chemistry, and is beneficial to market popularization.

The invention relates to a method for preparing methanol and ethanol by methyl acetate by way of hydrogenation. The method comprises the following steps: mixing the methyl acetate with hydrogen, wherein the mixture enters into a reactor catalyst bed layer, and performing the hydrogenation reduction reaction under the effect of a catalyst, wherein the reaction temperature is 200-260 DEG C, and the reaction pressure is 1.8-3.0MPa; first, cooling the products generated by the hydrogenation reduction reaction and then, distilling to obtain methanol and ethanol. According to the method provided by the invention, methyl acetate with the purity of byproduct of 50-99% for preparing polyvinyl alcohol is directly used as a raw material, so that the method is low in production cost. The catalyst is adopted for hydrogenation reaction on methyl acetate, so that the efficiency is high and the selectivity is high. After reaction, the product does not contain water, and methanol and ethanol can be separated through simple distillation, so that the reaction percent conversion and the product quality are improved. The catalyst is long in service life, and matters obtained by distillation can be used for the next reaction. Mechanical circulation is realized, and the demand of greenness and environment-friendliness is realized.

The invention belongs to the technical fields of nano materials and electrochemistry, and particularly relates to a metal organic framework material CuBDC nano sheet and a preparation method thereof (herein BDC is 1,4-dicarboxylic benzene). The material can be used as a sodium ion battery anode material and is formed by stacking a plurality layers of the CuBDC nano sheets, wherein thickness of single nano sheet is 15-25 nm and the side width of the nano sheet is 3-7 [mu]m. The nano sheet has a porous structure of which the BET specific surface area is 530-550 m<2> / g and the pore size is less than 2 nm, wherein the porous structure belongs to microporous structure. The metal organic framework material CuBDC nano sheet has uniform morphology and has excellent electric-conductive performance; when being used as the sodium ion battery anode material, the material has excellent rate, high specific capacity and excellent circulation stability. The material has simple process, is economical, satisfies requirement of green chemistry and is easy to commercially promote.

The invention relates to a laminated Na3V2(PO4)3@rGo nanocomposite and an preparation method and an application therefor. The nanocomposite can be used as a sodium ion battery positive electrode active material with high rate capability and long service life; and the nanocomposite is formed by a sheet structure and rGO nano-sheets in a layer-to-layer overlapping manner, wherein the sheet structure is formed by nanoscale sub-unit Na3V2(PO4)3 particles. When the laminated Na3V2(PO4)3@rGo nanocomposite is used as the sodium ion battery positive electrode active material, the material is excellent in cycling stability and high in rate capability, so that the laminated Na3V2(PO4)3@rGo nanocomposite is the potential application material for the sodium ion batteries with high rate capability and long service life; and in addition, the preparation method is simple in process, capable of meeting the green chemistry demand, low in equipment requirement and good for the marketization promotion.

The invention discloses a preparation method of a silver-loaded nano cellulose-chitosan composite film, the preparation method of the silver-loaded nano cellulose-chitosan composite film comprises the following steps: adding sodium periodate into a nano cellulose solution, stirring in a dark place, centrifuging for separation, and washing to obtain dialdehydo nano cellulose; adding a newly-prepared saturated silver ammonia solution for preparation of silver-loaded nano cellulose; mixing the silver-loaded nano cellulose with a chitosan solution to obtain a silver-loaded nano cellulose-chitosan antibacterial film. Nano silver particles prepared in the method are evenly distributed in dialdehydo nano cellulose network structures, the easy agglomeration problem of the nano silver particles can be well solved, the preparation process does not require the use of special instruments, also does not need a chemical reducing agent, and the production cost is reduced. Through use of good mechanical properties of the nano cellulose, the low mechanical strength problem of the chitosan film is improved, and the antibacterial property of the chitosan film is improved by silver loading operation. The silver-loaded nano cellulose-chitosan composite film has broad application prospects in antibacterial wound dressings and food packaging and other industries.

The invention relates to a potassium ion embedded type vanadium pentoxide nanowire and a preparation method thereof. The preparation method includes 1), weighing V205 to add into deionized water, adding a KOH (potassium hydroxide) water solution and stirring to obtain a water solution; 2), transferring the water solution into a reaction still, heating the water solution, and obtaining deep green products after the water solution is taken out; 3), performing centrifugal separation, washing the deep green products by a mixed solution mixing with absolute ethyl alcohol and deionized water, and then placing the deep green products in a dryer to dry; 4), putting the deep green products in a muffle furnace to have a heat treatment to obtain yellow green samples; and 5), washing the yellow green samples in step 4 with the mixed solution mixing with the absolute ethyl alcohol and the deionized water, putting the yellow green samples in the dryer to dry to obtain the potassium ion embedded type vanadium pentoxide nanowire. The potassium ion embedded type vanadium pentoxide nanowire has the advantages that the nanowire has high specific capacity, good cycling stability and excellent rate capability, and is a potential high-performance commercial lithium ion battery anode material.

The invention discloses an MXene / silver nanowire / nanocellulose composite film and a preparation method thereof. The method mainly comprises the following steps: (1) etching MAX to prepare a single-layer MXene colloidal solution; (2) preparing a silver nanowire colloidal solution; (3) preparing a carboxylated nanocellulose colloidal solution by a TEMPO oxidation method; (4) mixing the three colloidal solutions according to a certain mass ratio, conducting stirring and carrying out ice-bath ultrasonic treatment to obtain a uniform mixed solution; and (5) carrying out vacuum suction filtration on the mixed solution, and carrying out hot-pressing drying to obtain the MXene / silver nanowire / nanocellulose composite film. According to the preparation method of the MXene / silver nanowire / nanocellulose composite film, the prepared composite film has good flexibility, electrochemical performance, electromagnetic shielding performance and antibacterial performance, and has wide application prospects in the fields of aerospace, weaponry, flexible wearable equipment and the like.

The invention provides a PEI (polyethyleneimine) modified cellulose membrane adsorbent and a preparation method thereof. The preparation method comprises the steps of (1) preparing a cellulose solution; (2) defoaming, knifing, gelatinizing and washing the cellulose solution to prepare a cellulose hydrogel membrane; (3) oxidizing an object obtained in the step (2) into a hydrogen peroxide solutionto obtain an oxidized cellulose hydrogel membrane; (4) soaking an object obtained in the step (3) into a PEI water solution for reacting, and washing with water after finishing reaction to obtain a PEI modified cellulose hydrogel membrane; (5) drying an object obtained in the step (4), and preparing the PEI modified cellulose membrane adsorbent. The preparation method is simple, and no cross-linking agent needs to be used during a preparation process, so that not only is the cost favorably reduced, but also adverse effects brought by additive residues are avoided; meanwhile, the preparation process is environmentally friendly without pollution, and the prepared adsorbent has an excellent adsorption effect on heavy metal ions and is easy to separate and recover after use.