41results about How to "Short synthesis cycle" patented technology

The invention provides a method for synthesizing tirpotide by adopting a solid-liquid combination strategy. The preparation method comprises the following steps: firstly, respectively synthesizing full-protection peptide fragments (1-17) and (18-39), and then carrying out liquid-phase splicing and deprotection to obtain crude peptide; according to the strategy, the synthesis period can be remarkably shortened, large-scale industrial production is facilitated, meanwhile, the synthesis yield is high, and the purity and content of the obtained crude peptide are high.

The invention belongs to the technical field of battery materials, and particularly relates to an MXene material composite nickel-iron-manganese-based positive electrode material and a preparation method and application thereof. The chemical formula of the MXene material composite nickel-iron-manganese-based positive electrode material is NaNiaFebMncTMdO2 (at) MXene, TM is one or more of Mg, Al, Ti, Zn, Zr, Cu, Nb, W and Mo, values of a, b, c and d depend on charge balance, M in MXene is one or more of Ti, Nb, V, Mo, Ta, Cr and Hf, X is C or N, and ene represents a structural unit of graphene. MXene is compounded with the nickel-iron-manganese-based positive electrode material, so that the situation that the nickel-iron-manganese-based positive electrode material is in contact with water and CO2 in air to inhibit the interface side reaction between electrolyte and the nickel-iron-manganese-based material can be reduced, and excellent cycling stability is shown under high voltage.

The invention belongs to the technical field of photochromic compounds, and particularly discloses a photochromic diarylethene compound as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out coupling reaction on 2, 3-dibromo-1, 1-dimethyl-1H-indene and a borate compound to obtain a diarylethene compound; the boric acid ester compound comprises one or more of 2-methyl-5-phenyl-thiophene boric acid ester, 5-methyl-2-phenyl-thiazole boric acid ester and 2-methylnaphthalene boric acid ester. The present invention provides a diarylethene photochromic compound using indene as an alkene bridge, which can reversibly change between open-loop isomers and closed-loop isomers under the condition of illumination with a specific wavelength, and can reversibly change properties such as color and absorption spectrum of the compound. The invention further provides a preparation method of the compound. The preparation method has the advantages that the preparation method is simple, the product safety is high, the raw material cost is low, the product is easy to separate, and industrial synthesis is easy to realize.

The invention belongs to the technical field of battery materials, and mainly relates to a method for preparing an inorganic carbon composite sodium ferric sulfate positive electrode material under the assistance of reduced iron powder and a sodium ion battery. The method comprises the following steps: adding sodium sulfate, ferrous sulfate and reduced iron powder into deionized water, stirring until the sodium sulfate and the ferrous sulfate are completely dissolved, and separating the residual reduced iron powder to obtain a sodium ferric sulfate precursor solution; mixing the sodium ferric sulfate precursor solution with an inorganic carbon source, stirring, and carrying out spray drying to obtain an inorganic carbon composite sodium ferric sulfate positive electrode material precursor; and sintering the precursor in an inert atmosphere to obtain the inorganic carbon composite sodium ferric sulfate positive electrode material. According to the method, ferric iron is reduced into ferrous iron with electrochemical activity by using the reducing iron powder, and the inorganic carbon source is used as the conductive agent, so that the problem of poor conductivity of the material caused by incomplete decomposition of the organic carbon source in the sintering process is avoided, the pure-phase sodium ferric sulfate positive electrode material with high conductivity is synthesized and prepared, and the electrochemical performance of the material is improved.

The invention relates to the field of nano-composite flame retardants, in particular to a preparation method of a nano-composite flame retardant with alkali metal silsesquioxane particles loaded on the surface of a carbon nano tube, which comprises the following steps: adding an organic solvent and the carbon nano tube into a reaction container, performing ultrasonic and mechanical stirring, adding alkali metal silsesquioxane powder into the reaction container, and performing stirring to obtain a nano-composite flame retardant; a grey black mixed solution is obtained; and carrying out suction filtration on the mixed solution, and drying the obtained filter cake to prepare the nano composite flame retardant with alkali metal silsesquioxane particles loaded on the surface of the carbon nano tube. The product prepared by the invention still presents a one-dimensional nanotube shape, the structure thermal stability of the product is good, the surface of the prepared nanotube is rough on the premise of keeping the one-dimensional nanotube microstructure, agglomeration among a plurality of nanotubes is effectively prevented, and the performance of the nanotube is improved. And the flame retardant is a nano composite flame retardant with dual excellent characteristics of the carbon nano tube and the metal silsesquioxane.

The invention discloses a preparation method of a metal atom doped cobaltosic oxide electrolyzed water catalyst, and relates to a preparation method of an electrolyzed water catalyst. The invention aims to solve the problems of high cost, slow reaction in an acid environment and relatively high overpotential of the existing electrolytic water oxygen evolution catalyst prepared from noble metals and compounds thereof. The preparation method comprises the following steps: 1, dissolving cobalt nitrate in a solvent, and uniformly stirring; 2, adding the metal salt into the solvent, and uniformly stirring; and 3, sequentially dropwise adding to the surface of the carbon cloth, then heating and preserving heat, and cooling in air after heat preservation. The method is used for preparing the metal atom doped cobaltosic oxide electrolyzed water catalyst.

The invention belongs to the technical field of battery materials, and particularly relates to a carbon-coated iron-based composite phosphate positive electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: performing wet grinding on iron salt, M salt, a sodium source, a phosphorus source, a complexing agent and a solvent according to a stoichiometric ratio to obtain slurry A; carrying out spray drying on the slurry A to obtain solid powder B; pre-sintering the solid powder B in an inert atmosphere to obtain a precursor C, grinding the precursor C into powder, compacting the powder, sintering the powder at a high temperature in the inert atmosphere, and crushing the powder to obtain the carbon-coated iron-based composite phosphate positive electrode material. Wherein the chemical formula of the iron-based composite phosphate positive electrode material is Na4 [FexM1-x] 3 [PO4] 2P2O7, M is one or more of Ni, Co, Mn, Mg, Ti, Zn and Cu, and x is more than 0 and less than 1. The prepared positive electrode material is uniform in element distribution, excellent in cycling stability and high in specific capacity.

The invention is suitable for the technical field of thermoelectric materials, and provides a preparation method of a beta-SrZrS3 thermoelectric conversion block material, which comprises the following steps: carrying out vulcanization reaction on SrZrO3 powder to obtain beta-SrZrS3 powder; and the beta-SrZrS3 powder is subjected to rapid hot pressing sintering to form a block, and the beta-SrZrS3 thermoelectric conversion block material is obtained. The preparation method provided by the invention has the advantages of low cost, simplicity and rapidness, batch synthesis of the SrZrS3 block material can be realized, the synthesis period is shortened, the prepared beta-SrZrS3 thermoelectric conversion block material is pure in phase, uniform in component distribution and high in density, the used raw material is SrZrO3 powder which is cheap and non-toxic and does not need an inert storage environment, and the preparation method is suitable for industrial production. A vacuum tube furnace and a rapid hot pressing furnace are used, preparation is carried out through vulcanization reaction and hot pressing sintering, and the raw materials, the preparation process and the target product meet the environment-friendly requirement, so that the preparation method provided by the embodiment of the invention can be directly expanded to development of thermoelectric conversion application of perovskite sulfide; and a new way is provided for the development of a novel thermoelectric system.

The invention relates to the technical field of electrochemical energy materials, and particularly discloses a molybdenum nitride / nickel-cobalt nitride nanosheet heterostructure electro-catalytic material as well as a preparation method and application thereof. The method comprises the following steps: S1, preparing a copper hydroxide nanowire loaded on foamy copper; s2, preparing a copper nanowire loaded on the foamy copper; s3, preparing a copper nanowire loaded molybdenum doped nickel cobalt nanosheet; and S4, placing the copper nanowire loaded molybdenum doped nickel cobalt nanosheet in a tubular furnace, and nitriding in an ammonia nitrogen atmosphere to obtain the molybdenum nitride / nickel cobalt nitride nanosheet heterostructure electro-catalytic material. The internal resistance of the material is reduced through electron transfer and a heterostructure of molybdenum nitride and nickel-cobalt nitride, and compared with a precious metal platinum wire, the high-current-density hydrogen evolution performance is excellent. The preparation method provided by the invention has the advantages of simple synthesis process, short synthesis period and low production cost, does not need hydrothermal reaction during preparation, is high in safety and reliable in repeatability, and is very suitable for large-scale industrial production.

The invention relates to the field of drug synthesis, and discloses a method for preparing semeglutide through fragment condensation, which comprises the following steps: taking 1-4 amino acids of a semeglutide amino acid sequence as a fragment I, 1-16 amino acids of the amino acid sequence as a fragment II, 17-29 amino acids of the amino acid sequence as a fragment III, and 30-31 amino acids of the amino acid sequence as a fragment IV; preparing the first fragment, the second fragment, the third fragment and the fourth fragment into a semeglutide product by adopting a solid-liquid combination method; the fragment I of the method can effectively inhibit racemization impurities of His; the C-terminal amino acids of the second fragment, the third fragment and the fourth fragment in the method are all Gly, and racemization impurities cannot be generated when the three fragments are condensed. In addition, the fragment synthesized by the fragment II, the fragment III and the fragment IV is high in purity and good in solubility, the condensation reaction efficiency of the polypeptide fragment is high, the fragment utilization rate is high, the cost is low, the unutilized fragment can be extracted and separated, and the post-treatment is simple.

The invention belongs to the technical field of medicine synthesis, and particularly discloses a preparation method of esostine, which comprises the following steps: taking 2-aminobenzoic acid as an initial raw material, acylating with propionic anhydride, and cyclizing to obtain a compound 2; then reacting with o-aminophenetole and sodium hydroxide at high temperature to obtain a compound 3; oxidizing with hydrogen peroxide to obtain a nitrogen oxide compound 4; then reacting with methylsulfonyl chloride for chlorination to obtain a compound 5; reacting the compound 6 with single Boc piperidine, and then removing Boc protection to obtain a compound 7; and reacting the compound 5 with a compound 7 to obtain a compound 8, namely Erastatin. According to the method, polybrominated substituted impurities generated by bromination are avoided, the overall yield is increased, the product purity is high, and the Pd residue is less than 5ppm.

This invention relates to the field of flame retardant preparation technology, and more particularly to a method for preparing an environmentally friendly and highly efficient flame-retardant polyolefin cable sheath material. The invention uses compounds containing primary amino and amide bonds and compounds containing phenyl and phosphoryl chloride groups as raw materials. The reaction is carried out at room temperature for 0.5-1 h, then heated to 45 °C for 3-4 h, and then to 65 °C for 5-6 h. Through a condensation reaction, a phosphoramide macromolecular flame retardant containing phenyl and amide bonds is obtained, with a yield as high as 80.5-95.6%. This flame retardant is added to polyolefin cable sheath material at a mass ratio of 25%, then compounded and extruded to obtain a halogen-free flame-retardant polyolefin cable sheath material. The flame retardant molecule prepared by this invention simultaneously contains phosphorus and nitrogen flame-retardant elements and amide bonds forming a char skeleton. During combustion, it can exert a phosphorus-nitrogen synergistic flame-retardant effect and promote the catalytic char formation of the matrix, which can significantly reduce the heat and toxic gas release of polyolefin cable sheath material during combustion, thereby providing protection for the lives of people in fire scenes.

The application belongs to the field of pharmaceutical chemical industry, and particularly relates to a liquid-phase preparation method of a side chain of somatuline. The preparation method of the application is that Fmoc-His(Trt)-OH reacts with H-Aib-OtBu under the action of a condensing agent T3P to obtain Fmoc-His-Aib-OH. The preparation method provided by the application simplifies operation steps, can control monomer impurities below 0.05%, can control inferior isomer impurities below 0.01%, is short in a synthesis period, is low in cost, has few by-products, and is suitable for industrial production.

A hydrophilic gadolinium hydroxide nanosheet and a preparation method thereof. The hydrophilic gadolinium hydroxide nanosheet comprises, by mass percentage, 32.0%-40.0% of gadolinium oxide nanoparticles and 60.0%-68.0% of a silane coupling agent. The preparation method comprises: dissolving gadolinium oxide nanoparticles in deionized water to obtain a milky white dispersion A, reacting the milky white dispersion A with a diluted silane coupling agent with a pH adjusted to obtain a liquid B, and reacting the liquid B with a pretreated cation exchange resin to obtain clarified hydrophilic gadolinium hydroxide nanosheets. The hydrophilic gadolinium hydroxide nanosheets have uniform size distribution, stable crystal structure, good dispersibility, and are characterized by simple preparation process, mild reaction conditions, less by-products, high yield, low equipment requirements and short preparation cycle.

The invention discloses a method for synthesizing a beta-functionalized alpha-naphthol compound from beta-substituted alpha-tetralone. The method comprises the following steps: step 1, dissolving a substrate to prepare a mixture A; 2, performing alkali-oxygen reaction to prepare a mixture B; 3, extracting and separating to obtain a product; in the first step, the reaction solvent is one or more of methyl alcohol, ethyl alcohol, propyl alcohol, isopropyl alcohol, butanol, isobutanol, tertiary butanol, acetonitrile, N, N-dimethylformamide, methylbenzene, tetrahydrofuran and 1, 4-dioxane; according to the method, beta-substituted alpha-tetralone is used as a reaction substrate, air or oxygen is used as an oxidizing agent, and the beta-functionalized alpha-naphthol compound is directly synthesized under the action of a solvent and alkali. The method has the advantages of simple synthesis route, simple operation, green and environment-friendly reaction process, mild reaction conditions, cheap and easily available reaction reagents, short synthesis period, easy product separation and high product yield.

The present invention belongs to the technical field of catalyst preparation, and specifically relates to a preparation method and application of an acid-base carbon-based catalyst. A metal salt and water are prepared into a molten salt hydrate, and biomass is added to the molten salt hydrate for pretreatment; the pretreated biomass is roasted, washed, and dried to obtain an acid-base carbon-based catalyst. The present invention synthesizes an acid-base multifunctional carbon-based catalyst by pretreating biomass with molten salt hydrate, roasting, washing, and drying. The carrier raw material has a wide range of sources, and waste wheat straw, corn straw, pine sawdust and other biomass can be selected as raw materials; while preparing the carrier, the active component that efficiently catalyzes biomass carbohydrates to produce lactate is successfully loaded on the carrier.

The invention discloses a Standberg type polyoxometallate-based organic-inorganic compound for catalytic oxidation desulfurization as well as a synthesis method and application of the Standberg type polyoxometallate-based organic-inorganic compound. The molecular formula of the Standberg type polyoxometallate-based organic-inorganic compound is [Zn (H2datrz) 2 (P2Mo5O23) (H2O) 2]. 11H2O. The synthesis method comprises the following steps: step 1, mixing zinc acetate, 3, 5-diamino-1, 2, 4-triazole, sodium molybdate and deionized water to a homogeneous phase; the molar ratio of the zinc acetate to the deionized water is 1: 173, the molar ratio of the 3, 5-diamino-1, 2, 4-triazole to the sodium molybdate is 1: 1, and the molar ratio of the 3, 5-diamino-1, 2, 4-triazole to the zinc acetate is 4: 3; 2, adjusting the pH value to 2.5-3, stirring, heating, and carrying out hot filtration; and 3, standing the filtrate at room temperature for one week to obtain a product. The method has the characteristics of low cost, high yield and high catalytic efficiency.

The invention is suitable for the technical field of organic synthesis, and provides a safe synthesis method of pyrithiol hydrochloride. According to the invention, a one-pot technology is adopted, and pyrithiol hydrochloride is obtained through chlorination, hydrolysis-sulfuration, salification and refining reaction. According to the process provided by the invention, the product yield is high and is improved to 72-76% from traditional 60%, the product purity is also improved, and meanwhile, the process is simple to operate, few in side reaction and suitable for large-scale industrial production.

The invention relates to the technical field of battery positive electrode materials, in particular to a preparation method and application of manganese pyrophosphate. The preparation method of the manganese pyrophosphate comprises the following steps: (a) adding a phosphorus salt solution into a divalent manganese salt solution, and carrying out a mixing reaction; and (b) carrying out suction filtration, drying and calcining on the reaction system after the mixed reaction is finished to obtain the manganese pyrophosphate. According to the preparation method of the manganese pyrophosphate, an oxidizing agent and a non-ionic surface active agent (organic solvent) do not need to be added in the preparation process, so that the preparation method is green, environment-friendly, low in production cost and suitable for large-scale production, the reaction can be carried out at room temperature, the preparation method is simple, the synthesis period is short, and the yield is close to 100%.

The invention discloses a grinding aid for producing a regenerated composite admixture by using construction wastes and a preparation method of the grinding aid. The grinding aid is prepared from the following raw materials in percentage by mass: 10%-20% of modified triethanolamine mother liquor, 1%-5% of diethylene glycol, 1%-5% of sodium chlorate sulfate, 1%-5% of diethanolisopropanolamine, 1%-5% of calcium lignosulphonate and the balance of water. According to the scheme, the regenerated composite admixture has the advantages of simple preparation, reliable performance and the like, and has very high practical value and popularization value in the technical field of regenerated composite admixture production.

The application discloses low-density monolithic porous carbon and a microemulsion preparation method and application thereof, and relates to the field of foam carbon materials. The porous carbon material comprises a three-dimensional network structure formed by cross-linking and stacking of cavity carbon nanoparticles, and has a density of 0.16-0.35 g / cm 3 ; the phenolic resin is used as a precursor, the foaming agent, i.e., the microemulsion droplet of the imidazole compound, is used as a template, and a green solvent is used, and the monolithic porous carbon is obtained through a sol-gel reaction, drying and pyrolysis. The imidazole compound and the hydrophilic end of the foaming agent interact to form a flexible small-molecule interface film, reduce the interfacial tension and stabilize the emulsion droplet. The foaming agent is decomposed to form a cavity spherical structure during carbonization. The monolithic porous carbon has a developed porous structure and surface hydrophobicity, is beneficial to constructing a high-efficiency electrocatalytic reaction microenvironment, and is reflected in improving the surface reaction gas concentration and inhibiting excessive mass supply, so as to improve the electrocatalytic reaction selectivity. Based on the morphology, pore structure and surface properties, the monolithic porous carbon also has application potential in the fields of water purification and heat insulation and flame retardation.

The invention relates to the field of drug synthesis, and discloses a preparation method of semeglutide with a high fragment utilization rate, which comprises the following steps: taking amino acids from the first site to the sixteenth site of a semeglutide sequence as a fragment I, and taking amino acids from the 17th site to the 29th site of the semeglutide sequence as a fragment II; the 30th to 31st amino acids of the sequence of the semeglutide are used as a fragment III; a semeglutide product is prepared from the first fragment, the second fragment and the third fragment through a solid-liquid combination method, three fragments with C-terminal amino acids being Gly are preferably selected in the method, racemization impurities cannot be generated during condensation of the fragments, the synthesized fragments are high in purity and good in solubility, polypeptide fragment condensation reaction is easy to carry out, and the method is suitable for industrial production. The input amount of amino acid is only 1.5-2 times when the fragment is synthesized, the synthesized fragment does not need to be purified, the input amount of a carboxyl terminal fragment is only 0.95-1.05 times that of the amino acid fragment when the fragment is condensed, the fragment utilization rate is high, the cost is low, the unutilized fragment can be extracted and separated, and the post-treatment is simple.

The invention relates to an NITER-SiCf / SiC ceramic matrix composite material and a preparation method thereof. The preparation method comprises the steps of powder preparation, SiC fiber weaving, slurry impregnation and hot pressed sintering. The preparation method of the powder comprises the following steps: performing in-situ growth of an RE3Si2C2 coating layer on the surface of SiC powder through a molten salt method to obtain SiC coated RE3Si2C2 powder with SiC coated with RE3Si2C2; the molten salt method comprises the following steps: taking rare earth metal elementary substance powder or rare earth metal hydride as a raw material, mixing the raw material with SiC powder and molten salt, and synthesizing to obtain SiC (at) RE3Si2C2 powder of RE3Si2C2 coated SiC; the step of slurry impregnation comprises the following steps: mixing SiC (at) RE3Si2C2 powder with a mixed solution to prepare SiC (at) RE3Si2C2 impregnation slurry, and then immersing the SiC fiber woven body into the SiC (at) RE3Si2C2 impregnation slurry.

The invention discloses a preparation method and low-temperature application of a Te-doped tungsten niobium oxide / molybdenum niobium oxide heterojunction, and belongs to the technical field of secondary batteries. The preparation method specifically comprises the following steps: carrying out high-energy ball milling and alloying on WO3, Nb2O5 and Te2O5 to obtain amorphous Te-doped tungsten niobium oxide; the preparation method comprises the following steps: carrying out high-energy ball milling and alloying on MoO3, Nb2O5 and Te2O5 to obtain amorphous Te doped molybdenum niobium oxide; uniformly mixing and compacting the amorphous Te doped tungsten niobium oxide and the amorphous Te doped molybdenum niobium oxide, and performing discharge plasma sintering in an inert atmosphere to obtain the ceramic crystal Te doped tungsten niobium oxide / molybdenum niobium oxide heterojunction material. The Te-doped tungsten niobium oxide / molybdenum niobium oxide two-phase heterojunction material designed by the invention is relatively short in synthesis time, the synthesis period is shortened, the size of crystal grains is convenient to regulate and control, the crystallinity of the material is very good, the diffusion rate of lithium ions is greatly promoted by a heterojunction interface, the electron conductivity is improved by cooperating with Te doping, and the performance of the Te-doped tungsten niobium oxide / molybdenum niobium oxide two-phase heterojunction material is improved. The material can be used as a lithium ion negative electrode material with fast charging characteristic and good low-temperature performance.

The invention relates to the technical field of preparation of isopentenoic acid intermediates, in particular to a solid complex copper catalyst, preparation of the solid complex copper catalyst and application of the solid complex copper catalyst in synthesis of the isopentenoic acid intermediates. The catalyst is prepared by stirring a copper-based catalyst and organic amine at room temperature until the copper-based catalyst and the organic amine are completely dissolved; adding an adhesive and a carrier into the system, uniformly mixing, tabletting, and calcining to obtain a solid catalyst; wherein the copper-based catalyst accounts for 5%-10% of the mass of the whole catalyst. According to the preparation method, the solid complex copper catalyst and the fixed reaction bed are adopted, continuous synthesis is achieved, the reaction yield is increased by 90% or above, the whole reaction period is shortened by 60% or above, zero wastewater discharge is achieved through aftertreatment, the production cost is reduced, and the national requirements for energy and consumption reduction and green chemical engineering are met.

The invention belongs to the technical field of organic synthesis of pesticides, and discloses a synthesis method of triticonazole. The synthesis method of triticonazole comprises the following steps: taking cyclopentanone and p-chlorobenzaldehyde, and adding a catalyst for reaction to obtain an intermediate S-01; taking the intermediate S-01 and a methylation reagent, and reacting under an alkaline condition to obtain an intermediate S-02; and taking the intermediate S-02, 1, 2, 4-triazole and an oxidizing agent, and reacting under an alkaline condition to obtain triticonazole. According to the synthesis method of the triticonazole, the synthesis period of the triticonazole is remarkably shortened, the used raw materials are easy to obtain, the reaction steps are simple, the yield is high, the synthesized triticonazole is high in purity, a large amount of strong acid and strong alkali are not needed in the reaction, and the synthesis method is an efficient, environment-friendly and easy-to-control green synthesis method.

The invention discloses a preparation method of teriflunomide and an intermediate thereof in the technical field of medicine preparation. The preparation method comprises the following steps: step 1, mixing and stirring cyanoacetic acid, p-trifluoromethylaniline and an ethyl acetate solvent; 2, putting the mixture into microwave reaction equipment, and carrying out condensation reaction by utilizing the microwave reaction equipment to generate a key intermediate; step 3, after the condensation reaction is finished, carrying out condensation post-treatment, and drying the key intermediate by using microwave reaction equipment to obtain a purified intermediate; and 4, mixing the purified intermediate with acetyl chloride and sodium methoxide in a proper solvent to generate teriflunomide. According to the invention, the biocatalyst is adopted to replace the traditional metal catalyst, the reaction conditions are optimized, the post-treatment steps are simplified, the operation difficulty and cost are reduced, and the environmental pollution is reduced while the yield is improved.

The invention relates to the technical field of nanometer materials, in particular to a synthesis method of gold nanoclusters and application of the gold nanoclusters in food pigment detection.The gold nanoclusters are prepared with natural plant protein ginger protease containing sulfydryl and reducing amino acid as an exclusive template through the following steps that an enzyme solution and a chloroauric acid solution are prepared and mixed and stirred in proportion to form colloid; and adding NaOH to adjust the pH so as to unfold the protein structure, carrying out microwave treatment after constant volume and uniform mixing, cooling, and storing in a dark place. The ginger protease is innovatively selected as a template, microwave synthesis is adapted, the synthesis period is shortened, and the product performance is improved; the detection system is high in specificity, good in interference resistance, mild in reaction condition, simple and convenient to operate, suitable for rapid detection of target pigments in various foods, and high in application value.

The invention discloses a high specific surface area nano FAU molecular sieve synthesis method, which comprises: 1) dissolving a silicon source, an aluminum source and an alkali source in water, and uniformly mixing in a premixing device to obtain a mixed solution A; standing and aging to obtain a guiding agent; 2) dissolving an alkali source and an aluminum source in water by taking a silicon source as a single material to obtain a mixed solution B; in premixing equipment, premixing a silicon source and the mixed solution B with the guiding agent prepared in the step 1) to form reaction initial gel; and 3) transferring the initial reaction gel in the premixing equipment into a crystallization kettle for hydrothermal crystallization reaction, taking out a product after the reaction is finished, filtering, washing and drying to obtain the FAU molecular sieve. The particle size of the nanosheet-shaped FAU molecular sieve is 20-450 nm, the specific surface area is 960-1100 m < 2 > / g, and the pore volume of mesopores is 0.1-0.8 cm < 3 > / g; more active sites can be provided, the diffusion path is shorter, and the molecular diffusivity can be improved.

The invention discloses a method for separating and purifying neodymium and dysprosium from a waste neodymium-iron-boron permanent magnet, and particularly relates to the field of resource recovery. A solid adsorbent is a zinc-based organic metal framework adsorbent (Zn-MOF), and the Zn-MOF solid adsorbent is prepared by taking zinc nitrate hexahydrate (Zn (NO3) 26H2O) and terephthalic acid (H2BDC) as raw materials, N, N-dimethylformamide (DMF) as a solvent and triethylamine (TEA) as an initiator through a normal-temperature stirring method. The synthesized Zn-MOF is used for primarily adsorbing and purifying neodymium and dysprosium in a waste neodymium-iron-boron simulation solution; and finally, the sintered Zn-MOF is used for secondarily adsorbing a desorption solution, so that the purpose of separating neodymium and dysprosium is achieved. According to the technical scheme, the problem that the neodymium and dysprosium extraction efficiency is affected due to the fact that the waste neodymium-iron-boron magnet leachate contains impurities is solved, and the neodymium and dysprosium extraction efficiency and purity are improved.