172 results about "Aqueous sodium hydroxide" patented technology

The invention belongs to the technical field of preparation and application of nano materials, and relates to a preparation method and application of amino-functionalized cerium oxide nano enzyme, and the preparation method comprises the following steps: adding 3-aminophenylboronic acid into a cerous nitrate hexahydrate aqueous solution to obtain a mixed solution; dropwise adding a sodium hydroxide aqueous solution into the mixed solution, carrying out hydrothermal reaction, cooling after the reaction is finished, centrifuging, washing and drying to obtain milk white powder, namely the amino-functionalized cerium oxide nano-enzyme. The boron element is introduced in the preparation of the cerium oxide nano-enzyme, and the amino-functionalized cerium oxide nano-enzyme is prepared by adopting a simple one-step hydrothermal synthesis method, so that the nano-enzyme has good phosphatase-like activity, has high selectivity and sensitivity to LPS, and is short in detection time, high in sensitivity, low in detection limit, simple in preparation process and high in preparation efficiency; the product is good in quality, high in stability, environment-friendly and extremely wide in market prospect.

The invention discloses a synthesis method of 2, 4, 5-trifluorophenylacetic acid, which comprises the following steps: by taking cheap and easily available o-chloronitrobenzene as a raw material, reacting with sodium nitrate in a sulfuric acid and trifluoroacetic acid system, separating generated 2, 4-dinitrochlorobenzene through melt crystallization, and continuing to synthesize 2, 4-dinitrochlorobenzene in methyl chloroacetate to obtain 2, 4, 5-trifluorophenylacetic acid. The method comprises the following steps: carrying out indirect aromatic nucleophilic substitution reaction on 2, 4-dinitrophenylacetic acid under the condition of sodium hydride to generate 5-chloro-2, 4-dinitrophenylacetic acid methyl ester, separating, carrying out fluorination reaction on the 5-chloro-2, 4-dinitrophenylacetic acid methyl ester and potassium fluoride under the action of a phase transfer catalyst, carrying out rectification separation to obtain 2, 4, 5-trifluorophenylacetic acid, and carrying out hydrolytic acidification on the 2, 4, 5-trifluorophenylacetic acid in a sodium hydroxide aqueous solution to obtain 2, 4, 5-trifluorophenylacetic acid. And the process route is safer, more environment-friendly, more efficient and lower in cost.

The invention discloses a preparation method and application of a functional nano-pesticide based on a random combinatorial library of polyhexamethylene biguanide hydrochloride analogues and phenolic hydroxyl group-containing natural small molecules. A PHMB analogue containing a mono-guanidyl or biguanidyl structure and a natural small molecule compound with 1-3 phenolic hydroxyl structures are selected, nano-particles with good dispersion coefficients can be formed in a sodium hydroxide aqueous solution with the pH value of 9-11 without additional carriers or stabilizers, and the limitation that traditional nano-pesticides depend on macromolecular carriers is broken through. The obtained nano-particles can be enriched on the surface of a plant pathogenic fungus cell membrane by utilizing the electrostatic adsorption effect of guanidyl, and the delivery effect of natural small molecules is enhanced, so that the antifungal activity of the nano-particles is improved. An antibacterial experiment result shows that part of the composition has a synergistic antibacterial effect on fusarium graminearum, and the diameter of an inhibition zone is superior to that of a single component. The method is high in construction efficiency, has good expansibility, can form a nano pesticide preparation library, and is suitable for plant disease prevention and control and environment-friendly material development.

The invention discloses an antibacterial and deodorant functional fabric and a preparation method thereof, and relates to the technical field of textile fibers. When the antibacterial and deodorant functional fabric is prepared, pre-modified titanium dioxide reacts with diallyl chlorophosphate to prepare modified titanium dioxide; the preparation method comprises the following steps: carrying out polycondensation on hydroxypropyl-terminated polydimethylsiloxane, ethylene glycol, 3, 5-pyridinedicarboxylic acid and terephthalic acid to prepare polyester, and reacting with 4-chloromethylstyrene to prepare modified polyester; carrying out melt spinning on the modified polyester and the modified titanium dioxide to obtain polyester fibers; spinning polyester fibers to obtain a fiber fabric; carrying out coprecipitation on the carboxylated beta-cyclodextrin and tea polyphenol to prepare a carboxylated beta-cyclodextrin inclusion compound; the preparation method comprises the following steps: mixing a polyester fabric with a sodium hydroxide aqueous solution to prepare an alkali-treated polyester fabric, and immersing the alkali-treated polyester fabric into a carboxylated beta-cyclodextrin inclusion compound aqueous solution to prepare the antibacterial and deodorant functional fabric. The antibacterial and deodorant functional fabric prepared by the invention has good antibacterial, deodorant, flame-retardant and mechanical properties.

The invention discloses a laser-induced lignin-derived porous carbon wave-absorbing material and a preparation method thereof, and belongs to the field of material preparation and microwave absorbing materials. The method comprises the following steps: dissolving lignin in a sodium hydroxide aqueous solution, and uniformly mixing with a polyethylene oxide aqueous solution to obtain a lignin ethylene oxide solution; the method comprises the following steps: preparing a lignin membrane by using a lignin ethylene oxide solution, performing laser irradiation, washing, performing suction filtration, and performing vacuum drying to obtain the laser-induced lignin-derived porous carbon wave-absorbing material. The lignin-derived porous carbon material prepared by taking industrial waste lignin as a raw material has the performance characteristics of being harmonious, low in density, high in reflection loss and wide in wave band absorption. The preparation method is green, environment-friendly, simple to operate and low in cost, and the waste lignin in the papermaking industry is successfully converted into a high-value adjustable functional material. The method meets actual application requirements and has huge application potential in the technical field of microwave absorbing materials.

The invention belongs to the technical field of sodium hypochlorite production, and particularly relates to a method for producing sodium hypochlorite. A method for producing sodium hypochlorite comprises the following steps: adding a compound additive into a sodium hydroxide aqueous solution, and uniformly stirring to obtain a compound alkali-containing raw material solution; respectively introducing the composite alkali-containing raw material solution and chlorine into the micro-channel reactor through a metering pump, and controlling reaction conditions to generate a reaction solution containing sodium hypochlorite; introducing the reaction liquid into a ceramic membrane separation device, separating and removing unreacted solid impurities and by-product salts, and collecting permeate; unreacted sodium hydroxide is recycled and reused; and detecting the permeate liquid to be qualified to obtain a sodium hypochlorite finished product. According to the invention, four key links of compound additive addition, microchannel reaction, ceramic membrane separation and resin recovery are organically linked to form a systematic solution. Aiming at the core pain points of insufficient reaction, more byproducts, raw material waste, equipment corrosion and the like in the traditional process, the product purity is improved through the synergistic effect of all links.

The present disclosure provides a preparation method of a porous hydrogel adsorbent based on Radix astragali residues, including the following steps: subjecting residues of Chinese herbal medicine Radix astragali as a precursor to bleaching with NaClO2, alkaline washing with KOH, and high power ultrasonic treatment, thereby obtaining a precursor solution of uniformly dispersed cellulose nanofibers (CNFs); adding the precursor solution of CNFs to a mixed solution of N,N′-methylene bisacrylamide (MBA), acrylic acid (AA) and ammonium persulfate (APS), shaking evenly, and initiating a polymerization reaction at a predetermined temperature to form a monolithic gel; and cleaning the monolithic gel, putting the cleaned monolithic gel into a dimethyl sulfoxide (DMSO) solution containing epichlorohydrin to allow reaction, and transferring the product of the reaction to an aqueous sodium hydroxide solution containing triethylene tetramine to allow reaction, thereby finally obtaining an amino-functionalized porous hydrogel adsorbent.

The invention discloses a preparation method of an arfamarana key intermediate, which comprises the following steps: carrying out nucleophilic addition reaction on a compound I and 1-[3-chloro-5-(trifluoromethyl) phenyl]-2, 2, 2-trifluoroethanone under the action of an organic solvent A and alkali to obtain a compound II; dissolving the compound II in an organic solvent B, adding concentrated sulfuric acid, carrying out intramolecular dehydration and cyanogen hydrolysis, and after the reaction is finished, cooling to room temperature for crystal growing to obtain a compound III; dissolving the compound III in an organic solvent C, carrying out intramolecular cyclization and ester hydrolysis reaction on the compound III and hydroxylamine hydrochloride under the action of a certain amount of sodium hydroxide aqueous solution, and after the reaction is finished, collecting a water phase and adjusting the pH value of the water phase, so as to obtain the key intermediate of arfampanaga. The reaction in each step has a high conversion rate, the purity of the prepared arfamarin intermediate is high, and powerful support and guarantee are provided for preparation of high-purity arfamarin.

The utility model relates to the technical field of waste oil regeneration, and discloses a waste white oil alkali washing device which comprises a tank body, a heating assembly is installed on the periphery of the tank body, a sleeve, a servo motor and a feeding pipe are sequentially and fixedly connected to the top of the tank body from left to right, and a liquid discharging pipe is fixedly connected to the bottom of the tank body. A stirring assembly is installed in the tank body, a top ring is slidably connected to the middle of a sleeve, a filtering barrel is fixedly connected to the bottom of the top ring, a connecting pipe is fixedly connected to the top of the top ring, an elastic assembly is installed in the middle of the top ring, a clamping block is slidably connected to the middle of the top ring, and a clamping groove is formed in the middle of the sleeve; and the middle part of the sleeve is slidably connected with a push rod. According to the utility model, firstly, waste white oil is input through the connecting pipe, and larger impurities can be filtered under the action of the filtering barrel at the bottom of the connecting pipe, so that the mixing efficiency of the waste white oil and a sodium hydroxide aqueous solution is ensured, and the impurities are prevented from blocking the pipeline.

The invention provides polyimide and a preparation method thereof. The preparation method comprises the following steps: adding a sodium hydroxide aqueous solution into a monomer solution containing a dianhydride monomer and an aprotic solvent, mixing, adding diisocyanate, carrying out a polymerization reaction to obtain a reaction product system, and precipitating from the reaction product system to obtain polyimide, wherein the feeding time of the diisocyanate is 4 to 5 hours; in the monomer solution, the molar concentration of the dianhydride monomer is 0.5-0.6 mol / L; the obtained polyimide has the advantages of high specific concentration viscosity, high molecular weight and excellent high temperature resistance.

The invention discloses a 2-hydroxy-benzonitril solution and a production method thereof, the production method comprises the step of preparing a wet 2-hydroxy-benzonitril product through reaction of salicylamide and phosgene, and is characterized in that the wet 2-hydroxy-benzonitril product is directly added into a sodium hydroxide aqueous solution to obtain the 2-hydroxy-benzonitril solution. The sodium salt solution can be directly produced without taking out the 2-hydroxy-benzonitril, so that exposure of the 2-hydroxy-benzonitril is avoided, personal injury is reduced, investment of drying equipment is reduced, and direct feeding of downstream products is facilitated.

The utility model relates to a photosensitive ink removing device for etching a miniature loudspeaker end cover, and belongs to the technical field of loudspeaker end cover processing, the photosensitive ink removing device comprises a basket, a soaking mechanism and a flushing mechanism arranged beside the soaking mechanism, the soaking mechanism comprises a soaking pool, a strip-shaped rack, a waterproof gear motor, a guide rail, a sliding rail, a base and a mounting seat, the strip-shaped rack, the guide rail and the sliding rail are all installed at the bottom of the soaking pool in the length direction of the soaking pool, the base is connected to the sliding rail in a sliding mode, and the waterproof gear motor is installed on the base. In the soaking process, the whole basket can perform wave-shaped motion, so that the aluminum plate is driven to swing left and right in a solution, on one hand, the aluminum plate swings left and right to stir the solution to generate turbulent flow, so that the solubility of a sodium hydroxide aqueous solution is uniformly distributed, and on the other hand, falling of ink floating skin can be accelerated; and the ink removal efficiency is greatly improved, and the labor intensity of workers can be relieved.

The invention discloses a preparation method of a glucose-iron-zinc double complex, which comprises the following steps: dissolving glucose in water, adding ferrite under a stirring condition, uniformly stirring, adjusting the pH value to 7.5-8.5 by using a sodium hydroxide aqueous solution, and stirring and reacting at 70-90 DEG C for 1-2 hours to obtain a reaction solution A; adding zinc salt into the reaction liquid A, uniformly stirring, adjusting the pH value to 8.0-9.0 by using a sodium hydroxide aqueous solution, and stirring and reacting at 70-90 DEG C for 1-2 hours to obtain a reaction liquid B; and carrying out microwave treatment on the reaction liquid B, adding an ethanol water solution under a stirring condition, standing at normal temperature, separating out precipitate, and carrying out vacuum drying on the precipitate to obtain the glucose-iron-zinc double complex. Glucose sequentially reacts with ferrous salt and zinc salt, metal ions are complexed, the glucose-iron-zinc double complex is prepared, and the glucose-iron-zinc double complex is good in stability, good in solubility and easy to absorb, is added into animal feed, is high in bioavailability and can promote growth and development of animals, reduce the diarrhea rate and improve the health level of the animals.

The invention relates to the technical field of preparation of inorganic chemical materials, and discloses a controlled synthesis process of a high-temperature-resistant sodium antimonate crystal structure, which comprises the following steps: dispersing antimony trioxide in a sodium hydroxide aqueous solution with the initial concentration of 6.5-8.0 mol / L, and adding sodium metaaluminate as a lattice directing agent to prepare a precursor base solution; heating the base solution, maintaining turbulent stirring, executing double-flow-path synchronous compensation, dropwise adding a hydrogen peroxide aqueous solution and synchronously adding sodium hydroxide; the method comprises the following steps: dynamically setting a coupling relationship among an alkali supplementing rate, an oxidation rate and a reaction stoichiometric ratio, counteracting a dilution effect of water generated by reaction and solvent water in real time, and maintaining the concentration of free sodium hydroxide in a mother solution in the whole reaction process at 6.0 mol / L or above until a reaction endpoint is reached. The path of lattice interstitial water or surface hydroxyl is blocked, anhydrous sodium antimonate without crystal water removal steps in the whole temperature range is prepared, and the foaming problem in high-temperature processing is solved.

This invention discloses an acid and alkali resistant polyamide membrane and its preparation method. The method is as follows: S1: Immerse the ultrafiltration base membrane in an aqueous sodium hydroxide solution for soaking and then set aside; S2: Treat the base membrane with a mixed aqueous solution of polyamine and aziridine crosslinking agent; S3: Wet the base membrane in an organic phase solution of polyacrylamide monomer to obtain a polyamide composite membrane; S4: Immerse the prepared polyamide composite membrane in an alcoholic solution of hydroxymethyl crosslinking agent, then dry it in a forced-air drying oven, and after washing with water, obtain the acid and alkali resistant polyamide membrane. This application uses two crosslinking agents, aziridine and hydroxymethyl, which can undergo specific crosslinking reactions with the carboxyl groups inside the polyamide membrane, to directly perform dual crosslinking modification on the membrane interior and surface, without introducing other polymer materials to avoid excessive increase in membrane permeation resistance. The polyamide membrane prepared by this method has both good acid and alkali resistance and water permeability.

The invention provides an epoxy resin curing agent containing MOFs as well as a preparation method and application thereof, and the preparation method comprises the following steps: S1, dissolving an organic ligand in an N, N-dimethylformamide (DMF) solution, and dropwise adding a sodium hydroxide aqueous solution into the organic ligand solution to obtain disodium salt; s2, dissolving the disodium salt precipitate obtained in the step (1) in distilled water; slowly dropwise adding 10mL of deionized water into manganese chloride, stirring and dissolving, adding a disodium salt aqueous solution, mixing, and carrying out vacuum drying to obtain a metal organic framework material Mn-NPA; s3, heating the Mn-NPA, and carrying out vacuum drying and activation on the Mn-NPA; s4, Mn-NPA and an imidazole compound are mixed for a load reaction; and S5, filtering and drying the reacted mixture to obtain the epoxy resin curing agent containing MOFs. According to the epoxy resin curing agent containing MOFs, an epoxy resin coating can be prepared into a single component, and the epoxy resin curing agent can be used once a cover is opened and is convenient to use and easy to construct.

The invention relates to the technical field of solid waste material recycling, in particular to a solid waste-based geopolymer and a preparation method thereof. The solid waste-based geopolymer comprises the following components in parts by mass: 400-500 parts of fly ash; 400 to 500 parts of mineral powder; 40-60 parts of a sodium hydroxide aqueous solution; 200 to 400 parts of water; the solid content of the nano waterborne epoxy emulsion is 30-62%, the particle size of the nano waterborne epoxy emulsion is 100-900 nm, and the nano waterborne epoxy emulsion accounts for 3-9% of the total mass. According to the invention, the compactness of a matrix is enhanced, shrinkage cracking caused by water evaporation is reduced, the toughness and anti-permeability of the material are improved, the compactness of an interface is enhanced, the saltpetering condition of the matrix is inhibited, and wide application in the field of building materials is facilitated.

The application discloses a chrysochlamys zollingeri extract functionalized viscose fiber and a preparation method and application thereof, and belongs to the technical field of functional fiber material preparation.The chrysochlamys zollingeri extract functionalized viscose fiber is formed by wet spinning process of a viscose original solution containing microcapsules, and the viscose original solution containing microcapsules is prepared by mixing a viscose original solution and chrysochlamys zollingeri extract / porous starch composite microcapsules, wherein the viscose original solution is prepared by impregnating cellulose pulp with a sodium hydroxide aqueous solution, carbon disulfide yellowing, and then dissolving and aging in a sodium hydroxide aqueous solution.The chrysochlamys zollingeri extract functionalized viscose fiber is prepared by microcapsule embedding combined with a mild spinning process, so that active ingredients of the chrysochlamys zollingeri extract are maximally retained, long-acting, stable and slow release and anti-inflammatory and soothing effects are achieved, the chrysochlamys zollingeri extract functionalized viscose fiber can be further processed into a functional fabric through a water jet process, and is suitable for high-end sanitary material fields such as infant paper diapers.

The invention belongs to the field of organic synthesis, and particularly discloses an acoustic resonance synthesis method of 1, 4-diformyl-2, 3, 5, 6-tetrahydroxypiperazine, which comprises the following steps: under acoustic resonance and room temperature conditions, formamide, glyoxal and alkali liquor are subjected to a reaction for 5-10 min to synthesize 1, 4-diformyl-2, 3, 5, 6-tetrahydroxypiperazine, and the 1, 4-diformyl-2, 3, 5, 6-tetrahydroxypiperazine is subjected to a reaction for 5-10 min to obtain the 1, 4-diformyl-2, 3, 5, 6-tetrahydroxypiperazine. The acceleration of acoustic resonance is 196-980 m / s < 2 >, and the alkali liquor is selected from a sodium hydroxide aqueous solution, a potassium hydroxide aqueous solution or triethylamine. According to the present invention, the alkali-catalyzed aldehyde amine condensation reaction is achieved by using acoustic resonance reinforcement, the 1, 4-diformyl-2, 3, 5, 6-tetrahydroxypiperazine is rapidly and efficiently synthesized, the reaction time is substantially shortened, the product yield is improved, and the method has broad industrial application prospects.

The application discloses a harmless combined treatment method for industrial aluminum ash, phosphogypsum and carbon dioxide, and comprises the following steps: S1, putting secondary aluminum ash into a sodium hydroxide aqueous solution, collecting tail gas and filtering; S2, slowly passing CO2 gas into the filtrate of S1, and performing three times of washing and filtering to obtain filter residue aluminum hydroxide; S3, adding phosphogypsum into the mixed solution of the second and third washing filtrates of S2, stirring and reacting, washing and filtering, and then evaporating and crystallizing the filtrate to obtain sodium sulfate; S4, calcining the filter residue of S3, and passing the generated gas into S2; S5, mixing and reacting the calcined solid with the tail gas collected in S1, collecting the reacted tail gas again and passing it into S4; and S6, reacting the solid in S5 with the first washing filtrate of S2, returning the filtrate to S1 after washing and filtering, and repeating S4 for the filter residue.

This invention belongs to the field of microwave catalysis, specifically relating to a method for preparing and applying a copper-manganese composite ferrite microwave catalyst capable of forming oxygen vacancies. The catalyst preparation method includes the following steps: (1) adding ferric chloride, copper chloride, and manganese chloride to deionized water to obtain a precursor aqueous solution, then adding urea and stirring; (2) adding sodium hydroxide aqueous solution dropwise to the precursor aqueous solution obtained in step (1) while stirring, adjusting the pH to 11-12 to obtain a suspension, and continuing stirring; (3) filtering, washing, and drying the suspension obtained in step (2) to obtain a solid substance; (4) grinding and sintering the solid substance obtained in step (3) to obtain the copper-manganese composite ferrite microwave catalyst. The preparation method of this invention has a simple process flow, short processing time, high safety, and better microwave catalytic activity and stability than manganese ferrite and copper ferrite alone.

The invention discloses a fully continuous flow preparation method of 4, 5-diiodine-1H-imidazole, and belongs to the technical field of synthesis and preparation. The method comprises the following steps: S1, simultaneously conveying an imidazole-containing sodium hydroxide aqueous solution, an iodine-containing elementary substance and a potassium iodide aqueous solution into a micro-mixer and a continuous flow coil reactor, and carrying out a continuous synthesis reaction to obtain a 4, 5-diiodine-1H-imidazole reaction solution; and S2, dropwise adding an acetic acid solution into the 4, 5-diiodine-1H-imidazole reaction solution to neutralize, separating out a solid product, washing with ice water, filtering and drying to obtain a 4, 5-diiodine-1H-imidazole solid. The fully continuous flow reaction technology system provided by the invention has excellent mass transfer and heat transfer performance, greatly enhances mixing among material molecules, greatly shortens the reaction time, and improves the reaction efficiency. The reaction time is shortened to more than ten seconds from more than ten hours of the traditional intermittent kettle reaction; meanwhile, the side reaction is inhibited, and the product quality of the 4, 5-diiodine-1H-imidazole (I) is improved.

The invention relates to a method for one-step synthesis of high-quality stannous oxide through intermittent ultrasonic reinforcement, and belongs to the technical field of semiconductor material preparation. The preparation method comprises the following steps: dropwise adding a sodium hydroxide aqueous solution into a stannous chloride aqueous solution at room temperature under a stirring condition until the pH value is 12.5-13.5 to form a mixed solution system; applying intermittent ultrasonic waves to the mixed solution system for intermittent ultrasonic treatment to induce direct nucleation and growth of stannous oxide and synchronous removal of chlorine impurities, carrying out solid-liquid separation, and drying the solid to obtain the low-chlorine fine-particle-size stannous oxide. According to the method, through the work-stop periodic effect of intermittent ultrasound, dynamic conditions are provided for diffusion and desorption of chloride ions while nucleation and growth regulation are promoted through cavitation, cooperative regulation of particle size refinement and deep dechlorination of stannous oxide is achieved, a high-temperature step or repeated washing is not needed, the process is simple and efficient, the conditions are mild, and the method is suitable for industrial production. And controllable preparation of the high-performance stannous oxide material can be realized.

To provide a method for efficiently regenerating wastewater solutions of sodium hydroxide. [Solution] A method for regenerating a waste sodium hydroxide aqueous solution containing aluminum, comprising the steps of: mixing and reacting an aqueous slurry containing a calcium compound with the waste sodium hydroxide aqueous solution to form a reaction solution containing a supernatant liquid and a solid reaction residue; and subjecting the reaction solution to a solid-liquid separation treatment to remove the reaction residue, thereby recovering the supernatant liquid as a regenerated sodium hydroxide aqueous solution.

To provide a laminate in which aluminum foil and a plastic base material are laminated and from which aluminum can be separated and recovered with a basic aqueous solution in a high yield, and to provide a method for producing recycled aluminum.SOLUTION: A laminate comprising at least one plastic substrate, a release layer, and a separation layer in this order, wherein the separation layer comprises a first polymer layer, an aluminum foil, and a second polymer layer in this order, the release layer is a peelable polymer layer composed of a material having an acid number higher than an acid number of a material constituting the inorganic material-deposited layer and / or the first polymer layer and higher than an acid number of a material constituting the second polymer layer, and when the laminate is cut into 1cm * 1cm and statically immersed in a 1% by mass sodium hydroxide aqueous solution at 60 °C for 6 hours, the aluminum foil-containing laminate including the separation layer can be separated and recovered by peeling off the release layer from the plastic substrate.SELECTED DRAWING: None

The application relates to the technical field of toothpaste, and discloses toothpaste with antibacterial and bacteriostatic effects and a preparation method thereof. The toothpaste is prepared from bacteriostatic paste base, silicon dioxide, titanium dioxide, sodium lauryl sulfate, sodium saccharin and peppermint essence. The bacteriostatic paste base is prepared from deionized water, sorbitol aqueous solution, sodium carboxymethyl cellulose, alpha-lipoic acid powder, sodium hydroxide aqueous solution and zinc sulfate aqueous solution. The toothpaste has good bacteriostatic performance.

The invention discloses a preparation method and application of an acid-base bifunctional magnesium-aluminum bimetallic oxide catalyst, and relates to the technical field of biomass catalytic conversion and heterogeneous catalytic materials.The preparation method comprises the steps that firstly, magnesium nitrate hexahydrate and aluminum nitrate nonahydrate are dissolved into a metal salt mixed solution; dropwise adding a sodium hydroxide aqueous solution into the metal salt mixed solution to obtain a turbid solution; heating and crystallizing in a water bath, transferring into a reaction kettle, and putting into a drying oven for hydrothermal crystallization. The method comprises the following steps: synthesizing a hydrotalcite-like precursor through a coprecipitation-hydrothermal coupling method, and carrying out high-temperature roasting to obtain the acid-base bifunctional composite metal oxide. The acid-base bifunctional composite metal oxide has the beneficial effects that the acid-base bifunctional composite metal oxide has a layered structure and a high specific surface area and is suitable for a biomass pyrolysis-catalytic reforming process, an alkaline site of the acid-base bifunctional composite metal oxide promotes a deoxidation reaction, an acidic site of the acid-base bifunctional composite metal oxide promotes an aromatization reaction, and the acid-base bifunctional composite metal oxide can effectively regulate and control the composition of biomass pyrolysis volatile components; the content of oxygen-containing compounds is obviously reduced, and the selectivity of monocyclic aromatic hydrocarbon is improved.

The invention provides a selenium-doped layered mixed-phase molybdenum disulfide-based piezoelectric catalyst, which is prepared by the following steps: adding selenium powder and sodium borohydride into an ethanol water solution to obtain a selenium-containing solution; adding a molybdenum source and a sulfur source into the selenium-containing solution, and stirring to obtain a reddish brown precursor solution; performing hydrothermal crystallization on the reddish brown precursor solution to obtain a black solid; grinding the black solid into powder, adding into a sodium hydroxide aqueous solution, stirring in a water bath, filtering and collecting the solid; and grinding the collected solid again to obtain the selenium-doped layered mixed-phase molybdenum disulfide-based piezoelectric catalyst. The molybdenum disulfide-based piezoelectric catalyst prepared by the invention is used for performing piezoelectric catalytic degradation on organic wastewater containing antibiotics and / or organic dyes in a microwave environment. According to the molybdenum disulfide-based piezoelectric catalyst, the out-of-plane piezoelectric response is improved, the carrier separation efficiency is improved, the problems that a traditional molybdenum disulfide piezoelectric material is low in active site density and low in carrier separation efficiency are solved, and the molybdenum disulfide-based piezoelectric catalyst can be recycled.

The application discloses an LDH-based vaccine adjuvant and a preparation method and application thereof, and belongs to the technical field of aluminum adjuvant preparation of vaccines, and the preparation method comprises the following steps: mixing at least one of soluble magnesium salt, soluble zinc salt, soluble manganese salt and soluble calcium salt with soluble aluminum salt, and then performing a co-precipitation reaction with a sodium hydroxide aqueous solution in a colloid mill device, and performing crystallization to obtain LDH nanosheets; dispersing the LDH nanosheets in a PBS solution, adding a hepatitis B surface antigen molecule drug, uniformly mixing, and then performing centrifugation to obtain the LDH-based vaccine adjuvant. The LDH-based vaccine adjuvant can significantly promote the maturation of DC cells and the activation of T cells, and the total IgG level reflects the overall humoral immune response intensity of the body to vaccines or pathogens; the LDH-based vaccine adjuvant forms a "storage library" at an injection site to store antigens and slowly release the antigens, and the purpose of long-time continuous stimulation of the immune system in the body is achieved.

The application belongs to the technical field of fluorocarbon surfactant application, and particularly discloses a synthesis method of sodium perfluorohexylethyl sulfonate, which comprises the following steps: (1) under the protection of nitrogen, perfluorohexylethyl iodine, potassium thiocyanate and a phase transfer catalyst are added into water and stirred to react, an organic layer is separated, and rotary evaporation is performed to obtain perfluorohexylethyl thiocyanate; (2) the perfluorohexylethyl thiocyanate is added into water and heated, and then chlorine is continuously introduced to stir to react, and filtration separation is performed to obtain perfluorohexylethyl sulfuryl chloride; and (3) the perfluorohexylethyl sulfuryl chloride is added into sodium hydroxide water solution drop by drop, and stirred to react, and after filtration, water washing, recrystallization and drying, the sodium perfluorohexylethyl sulfonate is obtained. The sodium perfluorohexylethyl sulfonate has high yield and high purity, has excellent surface activity, has excellent compounding performance with a hydrocarbon surfactant, has very good thermal stability, salt resistance and chemical stability, and meets the environmental protection requirements.