39 results about "Crosslinked chitosan" patented technology

The invention provides a chitosan composite material and a compound feed additive, and relates to the technical field of feed additives. The chitosan composite material comprises cross-linked chitosan and a porous carrier, the cross-linked chitosan is coated on the surface of the porous carrier; the porous carrier comprises a first porous carrier and a second porous carrier, the average particle size of the first porous carrier is 80-150 [mu] m, and the average particle size of the second porous carrier is 10-30 [mu] m. The chitosan composite material disclosed by the invention has relatively good heavy metal ion adsorption performance and can be used as a feed additive.

The application provides a long-acting, non-embolism filling monodisperse chitosan microsphere, the base material of the microsphere is cross-linked chitosan, the cross-linked chitosan is formed by cross-linking reaction of component A and a cross-linking agent, or formed by cross-linking reaction of component A, component B and the cross-linking agent; the component A is at least one of chitosan and modified chitosan, and the component B is at least one of hyaluronic acid, collagen and gelatin; the particle size of the microsphere is 20-120 mu m, and the variation coefficient of the microsphere particle size is not more than 5%. The application also provides a preparation method of the microsphere. The monodispersity of the microsphere is excellent, the degradation time is relatively longer, the water absorption performance is good, the embolism risk can be reduced, the filling effect maintaining time can be prolonged, and the effect of improving wrinkles can be increased, and the problems of short filling effect maintaining time and easy to cause blood vessel embolism of the filling hyaluronic acid product used in the existing medical and beauty field can be solved.

The present invention describes capsule compositions consisting of crosslinked chitosan, beta-glucan or alginate, and encapsulates an environmentally compatible ingestible larvicide, especially larvicidal agents such as essential oils or other ingestible larvicides such as Bacillus thuringiensis which are lethal to the larvae of pest insects, especially mosquito larvae.

The invention discloses a preparation method of a super-hydrophilic-underwater super-oleophobic oil-water separation material. The preparation method comprises the following steps: dissolving polyacrylonitrile and cellulose powder in an organic solvent, and mixing and stirring to obtain a spinning solution; standing the spinning solution, defoaming, carrying out electrostatic spinning on the defoamed spinning solution, and drying after spinning to obtain a polyacrylonitrile cellulose nano composite membrane; the preparation method comprises the following steps: preparing a chitosan cross-linking solution, dipping the polyacrylonitrile cellulose nano-composite membrane in the chitosan cross-linking solution, coating chitosan, cleaning and drying after dipping, and finally obtaining a super-hydrophilic-underwater super-oleophobic oil-water separation material, namely the polyacrylonitrile cellulose cross-linked chitosan composite membrane. The super-hydrophilic-underwater super-oleophobic oil-water separation material prepared by the invention has the advantages of long-acting stability, high flux, high separation efficiency, emulsified oil adaptability and simple and convenient process, and has relatively high flux and separation efficiency of 99% or above for various oil-water emulsions and oil-water emulsions with different concentrations.

The invention belongs to the field of photoelectric materials, and particularly relates to a silver nanowire composite citric acid cross-linked chitosan transparent conductive film and a preparation method thereof. The preparation method comprises the following steps: sequentially adding chitosan, citric acid and deionized water into a beaker, uniformly stirring, sequentially adding acetic acid and glycerol, continuously stirring, and reacting under a high-temperature condition to obtain a citric acid cross-linked chitosan solution; pET is cleaned and dried, then the silver nanowire suspension liquid is evenly sprayed on the surface of PET, and a silver nanowire / PET conductive film is obtained; and coating the citric acid cross-linked chitosan solution on the surface of the silver nanowire / PET conductive thin film, drying, and then stripping the thin film from PET. The silver nanowires on the conductive film have a grid structure, citric acid cross-linked chitosan is used as the substrate of the conductive film, the obtained conductive film has excellent heat resistance, light transmission and conductivity, and the preparation method is simple and easy to implement, free of toxic and side raw materials, safe and environmentally friendly.

The application discloses a finishing method of chitosan fiber and chitosan fiber prepared by the method, and comprises the following steps: preparing an acid aqueous solution of an anionic polyelectrolyte, adding a crosslinking agent and stirring uniformly, pre-crosslinking, and obtaining a pre-crosslinked chitosan fiber finishing solution; immersing formed chitosan fiber into the pre-crosslinked chitosan fiber finishing solution for soaking, drying and heat-crosslinking, and immersing into ethanol, and obtaining finished chitosan fiber. The application utilizes the property that chitosan fiber is activated into a cationic electrolyte under an acid condition, and an anionic polyelectrolyte is strongly adsorbed on the surface of the chitosan fiber through electrostatic interaction, effectively solves the problem that the interaction force between a sizing agent and other finishing agents and the chitosan fiber is weak, and effectively avoids the problem that the mechanical property of the chitosan fiber is poor due to the falling-off of the finishing agents and the sizing agent during use.

The invention belongs to the technical field of biology, and particularly relates to a bacteriostatic agent and a preparation method and application thereof. Comprising the following steps that antibacterial peptide modified silver nanoparticles are prepared, specifically, antibacterial peptide and silver nitrate grow in situ under the action of a reducing agent, and the antibacterial peptide modified silver nanoparticles are obtained; preparing a bacteriostatic agent: dissolving the antibacterial peptide modified silver nanoparticles by using a cross-linked substance of chitosan and dextran sulfate to obtain the bacteriostatic agent; the charge of the cross-linked substance of the chitosan and the dextran sulfate is 0. Through mutual attraction of positive charges of the antibacterial peptide and negative charges of the silver nanoparticles, the silver nanoparticles wrapped by the antibacterial peptide are formed, the self-assembly or irregular agglomeration behavior of the antibacterial peptide is effectively controlled, a nanometer network formed by crosslinking chitosan with dextran sulfate can stabilize the nanometer form of the silver nanoparticles, and the antibacterial activity of the antibacterial peptide is improved. The core-shell structure formed by the silver nanoparticles wrapped by the antibacterial peptide can be stabilized, the silver nanoparticles wrapped by the antibacterial peptide can also be dispersed, and mutual agglomeration of the core-shell structure is prevented.

The application discloses a high-transparency PET film resistant to steaming and cooking and a preparation method thereof, and belongs to the technical field of PET films. The preparation method comprises the following steps: preparing a filler, preparing a high-barrier additive, preparing a coating liquid, processing, coating and vacuum evaporation. The preparation of the filler comprises the following steps: coating cross-linked chitosan and adsorbing sodium carboxymethyl cellulose. The preparation of the high-barrier additive comprises the following steps: adsorbing magnesium citrate, adsorbing polyvinyl alcohol and adsorbing magnesium ions. The PET film prepared by the application has excellent resistance to steaming and cooking, high transparency, high barrier property and high flatness, does not need to use organic solvents in the preparation, and the coating in the PET film has strong bonding force and no defects on the surface.

The present invention discloses an adsorbent for removing excess hepcidin and a preparation method thereof. The adsorbent for removing excess hepcidin is made by using EDTA as a cross-linking agent to form cross-linked chitosan microspheres embedded with zirconium phosphate and / or zirconium oxide, and L-glutathione is bonded to the surface of the cross-linked chitosan microspheres. The adsorbent for removing excess hepcidin of the present invention uses chitosan microspheres as a carrier, and while the microspheres are cross-linked, further bonding ligands are introduced, eliminating the need for additional cross-linking agents and ligands. The reaction conditions are mild, the preparation method is simple, and the cross-linked microspheres have suspended carboxyl groups, which can be further coupled with peptides and amino acids to achieve functional modification. The microspheres can withstand high-temperature steam sterilization and effectively remove excess hepcidin and urea nitrogen from the blood.

The invention belongs to the field of functional materials and water treatment, and provides a preparation method of organic phosphonic acid functionalized super-crosslinked chitosan hydrogel, which comprises the following steps: dissolving chitosan in an alkali solution to obtain a chitosan suspension; adding benzaldehyde into the chitosan suspension, and carrying out condensation reaction to obtain a modified chitosan suspension; reacting the modified chitosan suspension with a quinary organic phosphonic acid solution to obtain an organic phosphonic acid functionalized chitosan solution; adding a potassium tripolyphosphate solution into the organic phosphonic acid functionalized chitosan solution, carrying out a cross-linking reaction, carrying out alcohol precipitation after the reaction is completed, carrying out solid-liquid separation, and collecting a precipitate; dispersing the precipitate in water to obtain a suspension; and uniformly mixing the suspension with a sodium alginate solution and a calcium salt solution, and carrying out a cross-linking reaction to obtain the quinary organic phosphonic acid functionalized super-crosslinked chitosan hydrogel. An organic phosphonic acid group and a C-P covalent bond are successfully introduced into a chitosan molecular chain, the morphology structure of original chitosan powder is greatly improved, adsorption sites on the chitosan molecular chain are enriched, and efficient application of chitosan in uranium-containing wastewater is remarkably improved.

The application belongs to the technical field of pharmaceutical preparations, and particularly relates to a diclofenac sodium enteric-coated tablet and a preparation method thereof. The diclofenac sodium enteric-coated tablet comprises a quick-release layer, a slow-release layer and an enteric-coated layer; the quick-release layer comprises the following components in parts by weight: 20-40 parts of diclofenac sodium, 5-15 parts of a disintegrating agent, 20-50 parts of a filling agent, 1-3 parts of a lubricant and 1-5 parts of a binder; the slow-release layer comprises the following components in parts by weight: 50-80 parts of diclofenac sodium, 5-15 parts of crosslinked chitosan, 1-3 parts of a lubricant and 1-5 parts of a binder; and the enteric-coated layer comprises the following components in parts by weight: 20-45 parts of an enteric material and 5-15 parts of N-acetylneuraminic acid derivative. The diclofenac sodium enteric-coated tablet has excellent in-vitro cumulative release degree, and has low hygroscopicity, high stability and high friability.

The invention discloses a high-elasticity polyester-cotton blended fabric and a preparation process thereof, and belongs to the technical field of blended fabrics. The fabric comprises cross-linked cotton fibers and aminated polyester fibers; the cross-linked cotton fibers are oxidized cotton fibers jointly cross-linked by chitosan quaternary ammonium salt and sulfhydrylated polyethylene glycol; the aminated polyester fibers are aminated polyester fibers carrying disulfide bonds; the cotton fibers and the polyester fibers are modified respectively to obtain the cross-linked cotton fibers and the aminated polyester fibers, and in the heat setting process, disulfide bonds in the aminated polyester fibers and sulfydryl in the cross-linked cotton fibers can be subjected to dynamic exchange reaction, so that the cross-linked cotton fibers and the aminated polyester fibers are subjected to heat setting; amino groups on the surfaces of the aminated polyester fibers can be combined with groups such as hydroxyl groups in the cross-linked cotton fibers through hydrogen-bond interaction, so that the cotton fibers and the polyester fibers form a network structure in a three-dimensional space, the mechanical property and elasticity of the fabric are improved, and the air permeability and hygroscopicity of the fabric are not degraded.

The present application relates to the field of environmental microorganism and wastewater treatment technology, and specifically discloses a kind of fermentation microbial inoculum for sewage treatment and application.The fermentation microbial inoculum is made by immobilizing multifunctional composite microbial inoculum on chitosan magnetic microspheres;The multifunctional composite microbial inoculum is compounded by the fermentation broth of Pseudomonas koreensis, Lactobacillus acidophilus, Brevibacillus brevis, Timumasidium and Bacillus licheniformis according to a specific viable count ratio.The chitosan magnetic microspheres have Fe3O4 as magnetic core and are coated with crosslinked chitosan layer.The present application successfully constructs a microbial repair system with functional complementation and easy recovery by combining specific flora compounding with magnetic immobilization technology.The microbial inoculum can efficiently and synchronously remove nitrate, tetrabromobisphenol A and heavy metal multi-component pollutants in groundwater or contaminated water bodies, and can be quickly recovered and reused by external magnetic field, with the advantages of high treatment efficiency, environmental friendliness and low cost.

The subject matter described herein relates to crosslinked chitosan hydrogels having desirable properties and methods of making and using the same.

The invention relates to the technical field of concrete, and particularly discloses a long-acting water retention type semi-flexible pavement grouting material and a preparation method thereof. The long-acting water retention type semi-flexible pavement grouting material provided by the invention has excellent high strength and long-acting water retention performance, the citric acid cross-linked chitosan can realize long-acting latching and slow release of water, the activated metakaolin can cooperate with the cementing material to improve the strength, the ettringite type expanding agent can counteract hydration shrinkage, and the long-acting water retention type semi-flexible pavement grouting material has excellent water retention performance. The problems that in the prior art, a semi-flexible pavement grouting material is low in strength and short in water retention time efficiency, cracks are easily generated due to drying shrinkage, and pavement water seepage or interface stripping is caused are effectively solved, and the use requirements of heavy traffic scenes such as expressways, urban main roads or large freight stations are met.

The invention discloses a production process of a water-soluble thiophanate-methyl preparation, and belongs to the technical field of pesticide preparations, the production process comprises the following steps: preparing porous drug-loaded microspheres by a spray drying method, crosslinking chitosan and methoxypolyethylene glycol under the action of a crosslinking agent to form polyethylene glycol modified chitosan, and coating thiophanate-methyl by using the polyethylene glycol modified chitosan as a loading material to prepare the water-soluble thiophanate-methyl preparation. Under the synergistic effect of the pore-forming agent, the granulation and pore-forming of the microspheres can be realized in one step. The thiophanate-methyl preparation prepared by taking the porous drug-loaded microspheres as the raw material not only has excellent water solubility and wettability, but also has the functions of slow release and pyrolysis resistance due to the combination of coating and micropores, the utilization rate of thiophanate-methyl is increased, and the raw material components have excellent biocompatibility and environmental friendliness, so that the thiophanate-methyl preparation has good application prospects. The sustainable development of agriculture is facilitated.

The application provides a hollow mesoporous silica (BTA@HMSNs-CS) material for metal material targeted corrosion inhibition and Pickering emulsion stabilization in an oil production well, a preparation method and an application. The material selects hollow mesoporous silica (HMSNs) as a nano container for loading corrosion inhibitors, cross-linked chitosan (CS) as a pH response valve for controlling corrosion inhibitor release and reducing interfacial tension to form a Pickering emulsion. The BTA@HMSNs-CS is assembled from an acid response cross-linked CS network and a large cavity HMSNs, the preparation method is simple and easy to implement, has good acid response and emulsion stabilization performance, and has great reference value and application prospect in the field of downhole metal corrosion prevention and emulsion stabilization.

The application belongs to the technical field of rare earth recovery, and particularly relates to a modified chitosan adsorbent for recovering scandium and a preparation method thereof, which comprises the following steps: (1) preparing a chitosan-acetic acid mixed solution, dropping the mixed solution into a NaOH solution, filtering off the alkali solution after soaking and solidifying, and cleaning the solid with deionized water until the filtrate is neutral to obtain a spherical gel; (2) adding a pre-crosslinking agent to the spherical gel, oscillating or stirring, filtering off the liquid, and washing the solid multiple times to obtain pre-crosslinked chitosan; (3) adding deionized water to the pre-crosslinked chitosan, mixing uniformly, then dropping in a crosslinking agent, oscillating until sufficient crosslinking is achieved, filtering off the liquid, and washing the solid to obtain the solid; (4) adding an ethanol solution and an amination reagent to the solid, oscillating or stirring, filtering off the liquid, and washing the solid to obtain polyaminated chitosan; and (5) uniformly mixing a solvent, the polyaminated chitosan, a phosphinic acid and an inorganic acid, heating, adding a formaldehyde solution, constant-temperature reaction, extraction, and removing the solvent to obtain the modified chitosan adsorbent.

This invention belongs to the field of clarifier technology, specifically relating to an environmentally friendly swimming pool water clarifier based on modified chitosan. It is formed by grafting and crosslinking chitosan with 2-acrylamido-2-methylpropanesulfonic acid and vinylimidazole using an initiator and a crosslinking agent. This invention uses AMPS and VIM to double-graft modify chitosan, giving the product excellent flocculation and turbidity removal, flocculation and algae removal, chlorine resistance, and wide pH adaptability. At a dosage of 5 mg / L, the turbidity removal rate reaches 96.2%, and the algae cell removal rate reaches 93.5%, demonstrating comprehensive performance superior to existing products such as unmodified chitosan, polyaluminum chloride, and cationic polyacrylamide.

The invention discloses an antibacterial material, an antibacterial polyethylene material, an antibacterial polyethylene film as well as a preparation method and application thereof, belongs to the technical field of antibacterial polyethylene, and overcomes the defects that chitosan is directly adopted as an antibacterial material in the prior art, and the antibacterial performance of polyethylene is limited and is not durable. The antibacterial material comprises an inner core and a coating layer, the inner core is talcum powder, and the coating layer comprises crosslinked ultra-high molecular weight polyethylene and crosslinked chitosan. According to the antibacterial material, the antibacterial performance of the antibacterial polyethylene film can be improved, and the antibacterial durability is greatly improved.

The invention belongs to the technical field of essence preparation, and discloses a green preparation method of safe and non-irritating essence for children products, which comprises the following steps: a) extracting aromatic plant raw materials by using a natural deep eutectic solvent (NADES) at 30-45 DEG C, the NADES being selected from lactic acid, glycerol and water in a ratio of 1: 2: 1 or choline chloride and glycerol in a molar ratio of 1: 2 and containing 10-20% of water; b) selectively removing aldehydes and peroxide / epoxidation by-products from the extracting solution obtained in the step a) through an adsorption microbead layer which is formed by crosslinking chitosan through genipin and has the primary amine density of 0.8-2.0 mmol / g at the temperature of 20-30 DEG C; and c) forming an inclusion compound from the aroma component treated in the step b) and beta and / or gamma-cyclodextrin according to a mass ratio of 1: (6-12), thereby obtaining the water-dispersible essence. According to the method, NADES low-temperature extraction and glycosaminoglycan selective aldehyde removal are connected in series, then cyclodextrin immobilization and controlled release are carried out, the aldehyde removal contact and mass transfer efficiency is improved, aldehyde is directionally removed, stimulation is reduced, the microbeads can be recycled, and a green closed loop is formed.

This invention provides a toothpaste for strengthening teeth and gums, belonging to the field of oral hygiene technology. It comprises the following components in parts by weight: 40-80 parts gallic acid extract, 1-5 parts antibacterial agent, 3-6 parts xanthate-crosslinked chitosan resin, 330-400 parts abrasive, and humectants, surfactants, and binders in a weight ratio of (100-300):(5-50):(5-40), with water added to bring the total to 1000 parts. The toothpaste for strengthening teeth and gums provided by this application contains gallic acid extract rich in active substances. Its various biological activities, including anti-inflammatory, antioxidant, antibacterial, and antiviral properties, can strengthen teeth and gums, kill bacteria, and relieve pain, showing significant efficacy in preventing and treating oral diseases such as periodontitis and oral mucosal ulcers. It also contains xanthate-crosslinked chitosan resin, which can better exert the efficacy of chitosan, improve the oral environment through adsorption, reduce damage to teeth from excessive friction, and help improve the anti-sensitivity and anti-inflammatory effects of the toothpaste.

The invention relates to the technical field of environmental microorganisms and wastewater treatment, and particularly discloses a fermentation inoculant for sewage treatment and application. The fermentation inoculant is prepared by immobilizing a multifunctional composite inoculant on chitosan magnetic microspheres, the multifunctional complex microbial inoculant is prepared by compounding fermentation broth of pseudomonas koreensis, lactobacillus acidophilus, bacillus brevis, massinia pemophila and bacillus licheniformis according to a specific viable count ratio, wherein the fermentation broth of the pseudomonas koreensis, the lactobacillus acidophilus, the bacillus brevis, the massinia pemophila and the bacillus licheniformis are used as raw materials. Fe3O4 is used as a magnetic core of the chitosan magnetic microsphere, and a cross-linked chitosan layer is coated outside the magnetic core. Through combination of specific flora compounding and a magnetic immobilization technology, a microbial remediation system which has complementary functions and is easy to recover is successfully constructed. The microbial agent can efficiently and synchronously remove nitrate, tetrabromobisphenol A and heavy metal multi-component composite pollutants in underground water or polluted water, can be quickly recycled and reused through an external magnetic field, and has the advantages of high treatment efficiency, environment friendliness and low cost.

The invention relates to a preparation method of euphausia superba oil with high phospholipid content. The preparation method comprises the following steps: mixing and soaking euphausia superba powder and absolute ethyl alcohol in proportion; carrying out counter-current extraction for 60-90 minutes once, and then carrying out counter-current extraction for 40-80 minutes by using absolute ethyl alcohol to obtain an euphausia superba oil ethanol solution and a solid phase; the passing temperature of the solid phase is 50-80 DEG C, the vacuum degree is 0.1-1.0 Mpa, and ethanol is evaporated, condensed and collected; further dehydrating the ethanol to prepare absolute ethyl alcohol for recycling; adding the euphausia superba oil ethanol solution into the attapulgite composite cross-linked chitosan microspheres, stirring and dispersing for 120-180 minutes, filtering and recovering the attapulgite composite cross-linked chitosan microspheres, and then recovering ethanol under reduced pressure to obtain the euphausia superba oil with high phospholipid content. According to the method, the euphausia superba oil with high phospholipid content is obtained by combining an absolute ethyl alcohol counter-current extraction technology with the attapulgite composite cross-linked chitosan microspheres, and the method has a relatively great application prospect and market.

The invention discloses a preparation method of photo-crosslinked chitosan-based composite hydrogel microspheres based on a microfluidic technology, and belongs to the technical field of biomedical materials. The preparation method comprises the following steps: reacting methacrylic anhydride with chitosan to obtain double-bond chitosan; the preparation method comprises the following steps: reacting lipoic acid with chitosan to obtain lipoic acid modified chitosan; the preparation method comprises the following steps: mixing double-bond chitosan with lipoic acid modified chitosan to obtain an aqueous solution of chitosan, adding tris (2-carbonyl ethyl) phosphorus hydrochloride, poloxamer F-127, a photoinitiator, dopamine and methyl hesperidin, and then performing stirring and centrifugal defoaming treatment to obtain a composite hydrogel precursor solution; and preparing the composite hydrogel precursor solution into composite hydrogel microspheres by using a microfluidic technology and a photocuring technology. The hydrogel microspheres prepared by the invention can effectively promote cell adhesion, and have good biocompatibility, water-retaining property and mechanical compressibility.

This invention belongs to the field of resource recycling and water treatment agent technology, and more specifically, relates to a cationic chitosan fiber, its preparation method, and its application. The present invention provides a cationic chitosan fiber with a cross-sectional size in the micrometer range. First, chitosan fibers are mixed with a cross-linking agent to undergo a cross-linking reaction, transforming the linear chitosan molecular structure in the chitosan fibers into a three-dimensional network structure of cross-linked chitosan fibers. Then, the cross-linked chitosan fibers are mixed with a quaternary ammonium salt cationic modifier for modification, so that the quaternary ammonium groups are fixed on the cross-linked chitosan fibers, thus preparing the cationic chitosan fiber. The quaternized cationic chitosan fiber prepared by this invention has a positive effect on Au(CN)2. ‑ The adsorption rate is extremely fast. Furthermore, the quaternized cationic chitosan fibers prepared in this invention exhibit excellent adsorption of Au(CN)₂ in an alkaline environment. ‑ Its adsorption capacity can reach up to 669.8±47.2 mg / g, which is much higher than that of the adsorbents reported so far.

The application relates to the technical field of renewable bioenergy, in particular to an enzyme catalysis synchronous desulfurization process for preparing bio-diesel from kitchen waste oil, which comprises the following steps: putting pretreated kitchen waste oil, immobilized lipase, a cross-linked chitosan porous microsphere composite adsorbent loaded with zinc oxide and iron oxide and methanol into the same reactor, and performing one-pot ester exchange reaction under the condition of 40-50 DEG C through the mode of step-by-step addition of methanol, so that deep desulfurization is synchronously completed in the reaction process, that is, the core contradiction that the existing desulfurization scheme cannot be applied to the one-pot process due to the incompatibility with the enzyme is solved.

The present invention relates to a carrier for culturing anaerobic ammonia-oxidizing bacteria, as well as a preparation method and application thereof. The method comprises culturing heterotrophic bacteria that utilize an organic carbon source to the late logarithmic growth phase, harvesting bacterial cells, mixing the bacterial cells with chitosan, and then cross-linking with calcium carbonate to prepare a cross-linked chitosan carrier; and modifying the cross-linked chitosan carrier with polyethyleneimine to obtain a carrier for culturing anaerobic ammonia-oxidizing bacteria. The carrier provided by the present invention can provide a suitable growth environment for anaerobic ammonia-oxidizing bacteria, facilitate the adsorption and reproduction of anaerobic ammonia-oxidizing bacteria, prevent bacterial cell loss, and achieve a long-lasting and stable denitrification effect.

The invention provides a conductive heterojunction catalyst, a preparation method and a catalytic reaction device. The preparation method comprises the following steps: adding a molecular sieve into a mixed solution of a cationic polymer and a sulfonic acid group-containing anionic polyelectrolyte, and mixing to obtain a modified molecular sieve; chitosan and the modified molecular sieve are subjected to crosslinking treatment, a composite material is obtained, the composite material is sintered in a protective atmosphere, and the conductive heterojunction catalyst is obtained. The conductive heterojunction catalyst obtained by the preparation method provided by the invention is high in conductivity, excellent in catalytic performance and stable in structure, and can be used for converting electric heat into energy supply for reaction and reducing carbon emission.

This invention discloses a soybean lecithin and its extraction method, belonging to the field of soybean lecithin technology. The extraction method uses fresh soybean oil by-products as raw material, which undergoes centrifugation, acetone degreasing, and ethanol extraction to obtain an ethanol extract. Finally, attapulgite-crosslinked chitosan microspheres are added to the ethanol extract to further remove impurity molecules, resulting in soybean lecithin with high stability and high soybean lecithin content. Utilizing the multi-porous structure and electrostatic interaction of the attapulgite-crosslinked chitosan microspheres, large impurity molecules, as well as polar inositol phospholipids and cephalins, which compete with soybean lecithin for solubility, are separated, thereby increasing the soybean lecithin content in the soybean lecithin. Furthermore, the attapulgite-crosslinked chitosan microspheres are grafted with tea polyphenols, which can scavenge free radicals through a hydrogen donation mechanism, blocking the phospholipid oxidation process and achieving both high stability and high antioxidant activity, thus improving the quality of the obtained soybean lecithin.