836 results about "Acetic acid solution" patented technology

The invention discloses a preparation method of a chitosan-sodium alginate-diatomite composite adsorbent. The preparation method comprises the following steps: (1) carrying out calcination pretreatment on diatomite; (2) dissolving sodium alginate powder in water; (3) adding the calcined diatomite into a sodium alginate solution to prepare a mixed solution a; (4) adding CaCl2 into an acetic acid solution for dissolving; (5) adding chitosan powder into a CaCl2 solution, and uniformly stirring to obtain a mixed solution b; (6) dropwise adding the mixed solution a into the mixed solution b for crosslinking to prepare SA / DM / CS composite gel balls; and (7) washing the gel balls with water for several times, repeatedly freezing and thawing for several times, and drying to obtain the composite adsorbent. The composite adsorbent is prepared by dropwise adding the sodium alginate solution containing the calcined diatomite into the mixed solution of the chitosan and the CaCl2, so that the problem of low mechanical strength of single sodium alginate hydrogel is solved, and the recycling stability of the hydrogel microsphere adsorbent is improved.

The invention is applicable to the technical field of intelligent response materials, and provides a three-dimensional azobenzene functionalized covalent organic framework intelligent response material and a preparation method thereof. The three-dimensional azobenzene functionalized covalent organic framework intelligent response material is prepared by uniformly grinding 3, 3 ', 5'-tetra [(3 ', 5'-diformylphenyl)]-hexamethyl biphenyl and azobenzene-4, 4 '-diaminotriphenylamine, adding an organic solvent, adding a catalyst acetic acid aqueous solution, quickly freezing, emptying air, sealing with flame, heating after recovering to room temperature, and obtaining the three-dimensional azobenzene functionalized covalent organic framework intelligent response material. According to the invention, the azobenzene functionalized covalent organic framework material with a bcu topological structure is synthesized; the material has excellent photostimulation response CO2 adsorption performance; reversible control of CO2 adsorption capacity can be realized through ultraviolet light and heating conditions, at least five times of circulation can be maintained, and good circulation stability is achieved.

The invention discloses a preparation method of a bionic cornea stroma lens for refractive correction, which comprises the following steps: solution preparation: dissolving type I collagen in an acetic acid solution, adding a film aid, fully stirring, and centrifugally defoaming to obtain a type I collagen composite solution; the I-type collagen composite solution is poured into an assembling groove, the curvature radius of titanium metal is set to be 6.8-8.0 mm, the titanium metal serves as a working electrode material, platinum metal serves as a counter electrode material, current parameters are set according to the needed thickness of the lens blank, the density is 3.50-6.50 mA / cm < 2 >, and the thickness of the lens blank is set to be 3.50-6.50 mA / cm < 2 >; a high-transparency cornea embryo material which is uniform in curvature in all directions and similar to human cornea fiber structure arrangement is formed after electrochemical assembly and cross-linking curing, accurate cutting machining is carried out through excimer laser, a concave / convex matrix lens with the needed correction degree is obtained, the correction precision is high after cornea interlayer implantation, and the correction precision is high. And meanwhile, the compound has excellent performance in the aspects of in-vivo stability and biological safety.

The invention discloses a preparation method of a cell inflammatory factor adsorbent, which comprises the following steps: mixing styrene, divinyl benzene and hydroxyethyl acrylate, and adding a pore-foaming agent and mesoporous SiO2 nano powder to prepare a porous microsphere carrier; the preparation method comprises the following steps: mixing chitosan and poly (N-isopropylacrylamide) in an acetic acid solution to obtain a temperature-sensitive chitosan hydrogel precursor solution; the preparation method comprises the following steps: activating the surface of a porous microsphere carrier by using 1-ethyl-(3-dimethylaminopropyl) carbodiimide and N-hydroxysuccinimide, mixing the activated porous microsphere carrier and a temperature-sensitive chitosan hydrogel precursor solution to obtain a water phase, and assembling, washing and drying in an oil phase to obtain the cell inflammatory factor adsorbent. Through the design of the core-shell structure and the addition of the mesoporous SiO2 nano powder, the temperature response characteristic and the recyclable characteristic are given to the cell inflammatory factor adsorbent, the adsorption capacity of cell factors is also improved, and a new solution is provided for physical adsorption of the cell inflammatory factors.

The invention belongs to the technical field of water treatment, and particularly relates to a preparation method and application of an organic / inorganic composite flocculant for swimming pool water treatment.The method comprises the steps that magnetic nanoparticles Fe3O4 and sodium silicate powder are mixed to prepare a magnetic polysilicic acid solution, chitosan and acrylamide of a certain mass are dissolved in a glacial acetic acid solution, and the magnetic polysilicic acid solution is prepared; and ammonium ceric nitrate is used as an initiator to prepare the chitosan-polyacrylamide flocculant. The prepared chitosan-polyacrylamide flocculant is stirred in a glacial acetic acid solution for 24 hours for pretreatment. The preparation method comprises the following steps: adding an Al2 (SO4) 3.18 H2O solution, a ZnSO4. 7H2O solution and a pretreated chitosan-polyacrylamide flocculating agent into a magnetic polysilicic acid solution according to a certain proportion, so as to prepare the Fe3O4-PSAZ-CS-AM composite flocculating agent. The method disclosed by the invention is simple in reaction operation, easy in reaction condition control, low in cost and high in turbidity removal and organic matter removal efficiency of the swimming pool water, and has relatively high popularization and application values.

The invention relates to a lightweight porous nickel ferrite composite electromagnetic absorbing material and a preparation method thereof, and belongs to the field of electromagnetic wave absorbing materials, and the lightweight porous nickel ferrite composite electromagnetic absorbing material is a porous electromagnetic absorbing material prepared by high-temperature annealing of a mixture containing ferric salt, nickel salt, an acetic acid solution and chitosan. The lightweight and porous nickel ferrite composite electromagnetic absorbing material has both lightweight and electromagnetic absorbing properties.

The invention discloses an antibacterial finishing agent containing quaternary ammonium salt chitosan and tannic acid as well as a preparation method and application of the antibacterial finishing agent. The antibacterial finishing agent is mainly a mixed solution containing quaternary ammonium salt chitosan, tannic acid and glacial acetic acid. The preparation method comprises the following steps: dispersing chitosan in deionized water, then adding 2, 3-epoxypropyltrimethylammonium chloride, heating and stirring, reacting, and purifying and drying to obtain quaternary ammonium salt chitosan; and dissolving quaternary ammonium salt chitosan in an acetic acid solution, and adding tannic acid to obtain the antibacterial finishing agent. In the application, the fabric is soaked in the antibacterial finishing agent, then soaked in deionized water for washing and finally dried, the finished and modified fabric is high in antibacterial property, the antibacterial rate on escherichia coli is 99.2%, and the antibacterial rate on staphylococcus aureus is close to 100%.

The present invention discloses a chitosan-modified highly transparent antibacterial polylactic acid film and a preparation method and application thereof. The polylactic acid film comprises the following raw materials by weight: 10 to 16 parts of modified chitosan, 35 to 55 parts of polylactic acid, 5 to 15 parts of casein, 50 to 300 parts of solvent and 30 to 50 parts of gelatin, wherein the solvent comprises hexafluoroisopropanol and acetic acid solution. The antibacterial polylactic acid film provided by the present invention has good toughness, strength and transparency, is suitable for the field of food packaging, can extend the shelf life of food, and can reduce plastic waste pollution.

The invention provides a modified chitosan flocculant for slime water treatment. The modified chitosan flocculant is prepared from the following raw materials: chitosan, dimethyl diallyl ammonium chloride, acrylamide, acetic acid and potassium persulfate. The invention also provides a preparation method of the modified chitosan flocculant for slime water treatment. The preparation method comprises the following steps: dissolving chitosan in a dilute acetic acid solution with the mass concentration of 60%, and stirring; adding acrylamide and dimethyl propyl chloride cyclic amine into the mixed solution, uniformly stirring, adding a potassium persulfate solution with the mass concentration of 4%, and introducing nitrogen for 20 minutes; then carrying out microwave reaction, and cooling to room temperature after the reaction is completed; adding absolute ethyl alcohol, centrifuging for 10 minutes, taking out, and continuously soaking in absolute ethyl alcohol for 12 hours, so as to obtain a final insoluble substance which is a graft polymer CS-g-ADM; and drying the polymer in a drying box at 105 DEG C until no weight loss occurs, and then grinding and storing. The flocculating agent disclosed by the invention has relatively good flocculability.

The invention relates to a preparation method and application of a covalent organic framework material capable of adsorbing sulfonamide antibiotics. The method comprises the following steps: S1, respectively putting an amino-containing monomer and an aldehyde-containing monomer into a glass tube to obtain a mixture, then adding a solvent, performing ultrasonic uniform mixing, then adding an acetic acid solution for catalytic reaction, and performing uniform mixing to obtain a mixed solution; s2, freezing the mixed solution with liquid nitrogen, then circularly vacuumizing, sealing a glass tube, drying after treatment, cooling to room temperature, and filtering and washing to obtain a precipitate; and S3, carrying out Soxhlet extraction, repeatedly washing, and putting into a vacuum oven to obtain a product, namely the covalent organic framework material capable of adsorbing the sulfonamide antibiotics. According to the application, the adsorbent is applied to adsorption of sulfonamide antibiotics in water. The novel covalent organic framework material prepared by the invention is used for removing low-concentration sulfonamide antibiotics for the first time, and is considered as an excellent adsorption material capable of reducing the risk of water quality and guaranteeing the health of water quality.

The invention belongs to the field of pharmaceutical analysis, and discloses a method for simultaneously determining the contents of tolperidone hydrochloride, methyl hesperidin and vitamin B6 in Naoluotong capsules, the method comprises three steps of preparation of a mixed reference solution, preparation of a test solution and content determination, and the chromatographic conditions of the content determination are as follows: a C18 chromatographic column, a C18 chromatographic column, a C18 chromatographic column, a C18 chromatographic column, a C18 chromatographic column, a C18 chromatographic column, a C18 chromatographic column, a C18 chromatographic column and a C18 chromatographic column; a mobile phase is methanol (A)-0.1% glacial acetic acid solution (B), gradient elution is carried out for 0-5 min, and 96% of B is obtained; 5-6 min, 96%-60% of B is selected; 6-20 min, the content of B is 60%-50%; the volume flow rate is 1.0 ml / min; the column temperature is 30 DEG C; the detection wavelength is 291 nm; the sample size is 1 microliter. According to the method, synchronous detection of three components (tolperidone hydrochloride, methyl hesperidin and vitamin B6) with remarkable physicochemical property difference can be realized, the chromatographic condition is simple, and the detection speed is high.

The invention relates to the technical field of water treatment, and provides an efficient chitosan-polyferric sulfate composite coagulant and a preparation method thereof. In order to solve the problems that a traditional inorganic coagulant is prone to secondary pollution, an organic coagulant is high in cost and complex in process control and the like, the invention provides a solution that natural chitosan serves as a raw material, the charge characteristic of the natural chitosan is enhanced through quaternary ammonium salt modification, and then the natural chitosan is compounded with the inorganic coagulant according to a specific proportion. The preparation method comprises the following steps: dissolving chitosan in a 2% acetic acid solution, adjusting the pH value to weak acidity, introducing quaternary ammonium salt, carrying out catalysis by an initiator at a constant temperature of 70 DEG C to complete a reaction, and carrying out centrifugal washing and vacuum drying to obtain modified chitosan; and then compounding with an inorganic coagulant according to a mass ratio of 1: (3-5) to form a composite system with charge neutralization and adsorption bridging functions. According to the invention, by accurately controlling the ratio of the components and process parameters, the preparation process is simple and controllable, and the obtained composite coagulant has the characteristics of high treatment efficiency, environmental friendliness and moderate cost.

The invention discloses a perfluorinated compound adsorption material and a preparation method thereof. Comprising the following steps: 1) placing moso bamboo in a high-temperature carbonization furnace for carbonization treatment, after carbonization is completed, taking out bamboo charcoal, carrying out acid treatment to remove surface impurities and part of ash, then repeatedly washing the bamboo charcoal with deionized water until the bamboo charcoal is neutral, and finally drying the bamboo charcoal to obtain pretreated bamboo charcoal; and 2) putting the pretreated bamboo charcoal into a chitosan acetic acid solution to load chitosan on the surface of the bamboo charcoal, repeatedly washing the bamboo charcoal with deionized water to remove unloaded chitosan, and then drying to obtain the perfluorinated compound adsorption material. The prepared adsorption material has high adsorption capacity and selectivity on perfluorinated compounds, the adsorption performance of the adsorption material on the perfluorinated compounds is improved by modifying the bamboo charcoal, and the adsorption capacities of the adsorption material on perfluorooctanoic acid and perfluorooctane sulfonic acid can reach 400 mg / g and 450 mg / g respectively.

The invention discloses a preparation method of antibacterial and hemostatic medical sponge, and relates to the technical field of preparation of medical sponge. The preparation method of the antibacterial hemostatic medical sponge comprises the following steps: cleaning silkworm cocoons after removing impurities, and immersing the cleaned silkworm cocoons in a neutral protease solution to complete degumming so as to obtain fibroin fibers; the preparation method comprises the following steps: dissolving chitosan in an acetic acid solution, dissolving polyvinyl alcohol in deionized water, adding sodium alginate, adding a silk fibroin solution to form a composite solution, dropwise adding an AgNO3 solution, introducing CO2, maintaining the pressure, quickly releasing the pressure, foaming, injecting into a mold, carrying out gradient freezing to form a multistage-aperture sponge matrix, immersing in a genipin ethanol solution, and transferring into a 5% CaC 12 solution for soaking. The silk fibroin provides a biocompatible substrate and promotes cell adhesion, the sponge is constructed into a hierarchical pore structure with a compact surface and a loose interior, and liquid absorption and blood coagulation factor enrichment are accelerated.

The invention relates to a degradable composition and flame-retardant degradable plastic. The degradable composition comprises PLA particles, modified lignin and a bio-based flame retardant, wherein the modified lignin is obtained by grafting polycaprolactone on lignin and then forming a core-shell structure on the surface of silane coupling modified calcium carbonate; the preparation method of the bio-based flame retardant comprises the following steps: heating and dissolving chitosan in an acetic acid solution, introducing nitrogen, adding an initiator, then adding a DOPO derivative with double bonds at the tail end, MDO and AA, and carrying out a polymerization reaction to prepare the flame retardant. According to the scheme, the lignin-PCL / calcium carbonate core-shell toughening agent and the P-N synergistic chitosan flame retardant are prepared and are jointly added into the PLA, the compatibility with the PLA is good, the problem of high brittleness of the PLA can be effectively solved, the elongation at break is improved, meanwhile, the material is endowed with flame retardance, and the biodegradability of the PLA material can be well kept.

The present invention discloses a preparation method and application of 2-phenylindole derivatives. Palladium acetate and copper acetate are added into a glacial acetic acid solution of an indole derivative (formula I) and an arylphenylboronic acid derivative (formula II), stirred at room temperature, and purified to obtain a 2-phenylindole derivative (formula III). The present invention provides a method for direct one-step synthesis of 2-arylindole compounds from indole derivatives and arylphenylboronic acid derivatives as raw materials. The present invention replaces oxygen with air to participate in an oxidation system, expands substituents of indole ring R1, adds substitution of 5-bit, 6-bit and 7-bit electron withdrawing groups and electron donating groups, further expands the range of substrates, and increases the yield of substitution on indole ring R1 by about 13%, wherein 2-methyl and 3-methoxy substituted by R2 and 6-chlorine substituted by R1 have good antifungal activity.

The invention relates to the technical field of electro-catalysis, in particular to a modified iron monatomic catalyst based on biomass carbon as well as a preparation method and application of the modified iron monatomic catalyst. The preparation method comprises the following steps: mixing and stirring chitosan, an acetic acid solution, thiourea and ferric chloride, adjusting the pH value to 7.5-8.5, and freeze-drying to obtain an aerogel precursor; pre-carbonizing the aerogel precursor to obtain a pre-carbonized product; mixing the pre-carbonized product with an alkali reagent, and calcining to obtain a metal nanoparticle doped monatomic catalyst; and carrying out ultrasonic treatment on the metal nanoparticle doped monatomic catalyst by using a mixed acid solution, washing to be neutral, and drying to obtain the modified iron monatomic catalyst. By adopting the modified iron monatomic catalyst provided by the invention, non-polar CO2 molecules and NO3 <-> are efficiently converted into urea under mild conditions, the yield of the urea is up to 2978.6 mu g h <-1 > mgcat <-1 >, and the maximum Faraday efficiency is up to 30.4%.

The embodiment of the invention relates to a zein / polyoxyethylene / dihydroquercetin nanofiber preservative film as well as a preparation method and application thereof, and belongs to the technical field of bio-based polymer composite materials. The preparation method of the zein / polyoxyethylene / dihydroquercetin nano-fiber preservative film comprises the following steps: dissolving zein in an acetic acid solution, then adding polyoxyethylene to obtain a zein / polyoxyethylene blended solution, and adding the zein / polyoxyethylene blended solution into the acetic acid solution to obtain the zein / polyoxyethylene / dihydroquercetin nano-fiber preservative film. Adding dihydroquercetin into the zein / polyoxyethylene blended solution, and uniformly mixing to obtain a spinning solution; the spinning solution is subjected to solution blowing and pressing spinning process treatment. The nanofiber preservative film provided by the embodiment of the invention has good hydrophobicity and oxidation resistance, and also has the advantages of good flexibility, hydrophobicity, oxidation resistance, antibacterial activity, biocompatibility, environmental protection, degradability and the like.

The invention provides a coal gasification slag denitration catalyst and a preparation method thereof, and belongs to the technical field of coal gasification slag denitration catalyst preparation. The preparation method of the coal gasification slag denitration catalyst comprises the following steps: mixing coal gasification slag and an acetic acid solution to obtain a mixed system, standing and aging the mixed system, and heating and drying to obtain a coal gasification slag acetic acid modified product; grinding and sieving the coal gasification slag acetic acid modified product to obtain coal gasification slag acetic acid modified powder; and calcining the coal gasification slag acetic acid modified powder to prepare the acetic acid modified coal gasification slag denitration catalyst. The preparation method disclosed by the invention is simple and feasible in process, low in cost and suitable for industrial large-scale batch production, and high-value recycling of solid waste coal gasification slag can be realized. After acetic acid modification treatment provided by the invention, the denitration activity of the coal gasification slag denitration catalyst is remarkably improved.

The invention relates to the technical field of preparation of astaxanthin sustained-release microspheres, and discloses chitosan-based astaxanthin sustained-release microspheres and a preparation method thereof.The method comprises the steps that chitosan powder is dissolved in an acetic acid solution, the pH value is adjusted, and a chitosan solution is prepared; dissolving astaxanthin in ethanol, and then adding the chitosan solution; adding a cross-linking solution into the emulsified solution, and performing cross-linking under a magnetic stirring condition to form astaxanthin sustained-release microspheres; adding the astaxanthin sustained-release microspheres into a strengthening solution for strengthening treatment; carrying out coating treatment on the astaxanthin sustained release microspheres subjected to the strengthening treatment; carrying out centrifugal treatment on the solution subjected to coating treatment, and collecting astaxanthin sustained-release microspheres subjected to centrifugal separation; and washing the collected astaxanthin sustained-release microspheres with PBS (Phosphate Buffer Solution). According to the invention, chitosan is used as a carrier to prepare the astaxanthin sustained-release microspheres, so that the astaxanthin can be continuously and stably released in intestinal tracts, the antioxidant and anti-inflammatory activity of the astaxanthin can be fully exerted, and further, the astaxanthin sustained-release microspheres have an effective treatment effect on osteoarthritis.

The invention relates to the technical field of medical dressings, in particular to a liquid adhesive bandage and a preparation method thereof.The preparation method comprises the following steps that according to the formula amount, sodium chloride and sodium citrate are added into water, and a mixture A is obtained; adding copper gluconate into the mixture A to form a mixture B; mixing Tween 20 with glycerin, adding L-menthol, and stirring to form a mixture C; adding the mixture C into the mixture B to form a mixture D; the preparation method comprises the following steps: adding acetic acid into water, uniformly mixing, adding chitosan, and dissolving to obtain a chitosan-acetic acid solution; adding a chitosan-acetic acid solution into the mixture D, and dissolving to form a mixture E; adjusting the pH value of the mixture E to 4.5-6.5, filtering, filling and sterilizing to obtain the liquid adhesive bandage. The prepared liquid adhesive bandage can quickly form a layer of protective film on the surface of a wound, effectively inhibits growth of bacteria and promotes wound healing, and meanwhile, the liquid adhesive bandage has good flexibility and comfort and small irritation.

The invention discloses a pretreatment method for efficiently extracting calcium in shrimp and crab shells. The pretreatment method comprises the following steps: carrying out microwave treatment on the shrimp and crab shells until the weight is constant, rehydrating for 10 minutes in a water bath at 90 DEG C, carrying out microwave treatment until the weight is constant, crushing, mixing with an acetic acid solution, stirring, centrifuging, and measuring the calcium concentration. According to the method, through microwave-rehydration-secondary microwave pretreatment, the carapace structure is destroyed, the contact area of organic acid and calcium is increased, the calcium recovery rate is increased, the treatment time is shortened, the energy consumption is reduced, the universality of raw materials is enhanced, comprehensive utilization of resources is facilitated, and the method is environmentally friendly and economical.

The invention discloses diaphragm coating slurry for a semi-solid battery and a preparation method of the diaphragm coating slurry, and belongs to the field of lithium battery diaphragms. The diaphragm coating slurry for the semi-solid battery is prepared from the following components in parts by weight: 10 to 15 parts of PI-COOH-coated TiO2 / APTMDS, 2 to 4 parts of a dispersing agent, 2 to 4 parts of a wetting agent, 2 to 4 parts of a thickening agent, 4 to 8 parts of a binding agent and 70 to 85 parts of water, the PI-COOH (at) TiO2 / APTMDS is prepared by the following steps: immersing PI particles into a NaOH solution for etching, and washing the PI particles with an acetic acid solution to obtain PI-COOH; the preparation method comprises the following steps: soaking PI-COOH in a TiOSO4 solution, carrying out ultrasonic cleaning, and heating to obtain PI-COOH coated TiO2; the preparation method comprises the following steps: dipping PI-COOH-coated TiO2 into an APTMDS methanol solution, standing, washing, and carrying out vacuum drying, so as to obtain PI-COOH-coated TiO2 / APTMDS.

A preparation method and application of a modified chitosan silica sol-based intumescent flame-retardant coating, the present invention relates to the technical field of intumescent flame-retardant coating preparation, and specifically to a preparation method of an organic-inorganic hybrid composite intumescent flame-retardant coating, and the application of the flame-retardant coating on the surface of a wood board material. The present invention is to solve the problem of flammability of wood. Method: The present invention uses a water bath synthesis method to hybridize and cross-link acidic silica sol and modified chitosan-acetic acid solution, and the chitosan molecules can be interspersed and distributed in the Si-O-Si gap. The formed coating has both inorganic and organic properties, and an organic-inorganic hybrid film-forming agent, i.e., a flame-retardant coating, is obtained. Compared with the existing intumescent flame-retardant coating, the modified chitosan silica sol-based composite flame-retardant coating of the present invention not only has a small amount of intumescent flame retardant added and high flame retardant efficiency, but also has good physical properties while ensuring the high flame retardant performance of the material. The flame-retardant coating prepared by the present invention is used in the field of preparing flame-retardant panels.

The invention discloses a graphene oxide-chitosan-carboxymethyl cellulose composite aerogel and an application of the graphene oxide-chitosan-carboxymethyl cellulose composite aerogel in adsorption of amaranth. The preparation method comprises the following steps: mixing a carboxymethyl cellulose aqueous solution with a chitosan acetic acid solution, adding gallic acid, stirring until the gallic acid is completely dissolved, adding the graphene oxide dispersion liquid, and stirring until a system forms uniform and stable gel; the gel is firstly subjected to ultralow-temperature freezing and then subjected to freeze drying, and finally the graphene oxide-chitosan-carboxymethyl cellulose composite aerogel is obtained. The aerogel prepared by the method is environment-friendly and stable in pore structure, and is a composite aerogel material with high adsorption capacity and good regeneration performance on anionic dyes. The adsorption capacity of the aerogel to amaranth can reach 125 mg / g, the adsorption rate is still kept at 77% after the aerogel is recycled for 3 times, and the aerogel is suitable for efficient treatment of dye wastewater.

The invention provides a porous chitosan particle, a preparation method thereof and application of the porous chitosan particle in wound healing. The porous chitosan hemostatic particles are prepared by the following method: (1) providing a chitosan solution, wherein the chitosan solution is obtained by dissolving chitosan with the molecular weight of 10kDa-200kDa and the deacetylation degree of at least 80% in an acetic acid solution; (2) mixing the chitosan solution with an emulsifier and an oil phase, and emulsifying to obtain an emulsified product; (3) mixing the emulsified product with an alkaline solution, and stirring until a reaction is performed to generate a product containing porous chitosan; and (4) washing and filtering the product containing the porous chitosan by using an organic solvent and deionized water respectively, and carrying out freeze drying treatment to obtain the porous chitosan particles. The prepared porous chitosan particles have high porosity and low blood coagulation index, and can be used for stopping bleeding.

The invention discloses a sodium alginate / chitosan microsphere for loading cells and a preparation method, the preparation method comprises the following steps: adding a pore-foaming agent into a sodium alginate solution, and stirring overnight to obtain a sodium alginate solution containing the pore-foaming agent; the preparation method comprises the following steps: dissolving chitosan in an acetic acid solution, adding calcium chloride, and stirring until the calcium chloride is completely dissolved to obtain a chitosan mixed solution; dropwise adding a sodium alginate solution containing a pore-foaming agent into the chitosan mixed solution, standing, and filtering to obtain a microsphere precipitate; soaking the microsphere precipitate in a hydrochloric acid solution until no bubble overflows, filtering, cleaning and drying; according to the sodium alginate / chitosan microspheres for loading the cells, natural polymer materials, namely the sodium alginate and the chitosan, are adopted, so that excellent biocompatibility is ensured, and the rejection reaction risk is reduced; through a calcium carbonate pore-forming technology, the microspheres have an accurate pore structure, so that loading of cells and stable release of drugs are facilitated, the release rate is controlled, and the treatment effect is improved.

The invention relates to the technical field of multifunctional composite materials, in particular to wave-absorbing, photo-thermal and deicing integrated carbon aerogel and a preparation method thereof. The wave-absorbing, photo-thermal and deicing integrated carbon aerogel is characterized by comprising the following raw materials: 5-15 parts of a dominant bio-based material; 3-10 parts of an auxiliary bio-based material; 0.5 to 3 parts of cobalt salt; 1-5 parts of a photo-thermal material, namely an MXene material; a dispersion medium: 40-80 ml of a 1% v / v acetic acid solution; the concentration of the photo-thermal material dispersion liquid is 0.5 mg / mL to 2 mg / mL, and the concentration of the photo-thermal Compared with the prior art, the wave-absorbing, photo-thermal and deicing integrated carbon aerogel and the preparation method thereof have the advantages that through the collaborative design of a bio-based framework and MXene, the problems of function splitting, non-uniform photo-thermal material loading and insufficient wave-absorbing strength of an existing material are solved, collaborative fusion of photo-thermal deicing and wave-absorbing functions is realized, and the wave-absorbing performance of the wave-absorbing, photo-thermal and deicing integrated carbon aerogel is improved. The method is suitable for extreme environment protection scenes such as aerospace and wind power equipment.

The invention provides a COF (at) POC composite film and a preparation method and application thereof. The preparation method comprises the following steps: a) dissolving a COF aldehyde monomer and a POC aldehyde monomer in an organic solvent to obtain a first solution; meanwhile, dissolving a COF amine monomer and a POC amine monomer in an organic solvent to obtain a second solution; b) mixing the first solution, the second solution and an acetic acid solution to obtain a homogeneous membrane casting solution; and c) dispensing the homogeneous casting membrane liquid, and reacting to obtain the COF (at) POC composite membrane. Compared with the prior art, the preparation method provided by the invention has the advantages that specific raw materials are matched with specific process steps and conditions, the overall better interaction is realized, and the prepared COF-POC composite membrane is good in mechanical strength and has high ion flux and excellent ion selectivity for monovalent and divalent ion separation; the method has a wide application prospect in the fields of seawater desalination, salt lake lithium extraction, drug separation and the like.

The invention relates to a method for recovering lithium and fluorine from aluminum electrolysis hazardous waste, which comprises the following steps: firstly, mixing organic polyol and alkaline hydroxide according to a molar ratio of 1: (0.5-2) to obtain a eutectic solvent; heating the eutectic solvent to 80-150 DEG C, and adding a proper amount of raw material fine powder and calcium oxide for reaction leaching; carbonating and filtering the leachate to obtain lithium carbonate; washing the leaching residues with an acetic acid solution to obtain a calcium fluoride product; the concentration of fluorine ions in the leachate is smaller than or equal to 200 ppm, and the purity of calcium fluoride is larger than or equal to 90%; the leaching rate of lithium in the method is greater than 85%; the slag feeding rate of fluorine is greater than 95%; and no hydrogen fluoride gas is generated in the method. According to the method, a non-toxic and biodegradable eutectic solvent is adopted as a leaching agent, and efficient leaching of lithium and fluorine in the aluminum electrolysis dangerous waste materials is achieved; calcium oxide is used as a precipitating agent, free fluorine is promoted to be precipitated and recycled as calcium fluoride, the whole process meets the requirement of green metallurgy, and the win-win situation of resources and the environment is achieved.