125 results about "Water methanol" patented technology

The invention discloses a cellulose / graphene oxide / ZIF-67 derived nano-composite wave-absorbing material with a hierarchical porous structure and a preparation method, and relates to the technical field of preparation of wave-absorbing materials. The preparation method comprises the following steps: respectively dissolving dimethylimidazole and cobalt nitrate hexahydrate in absolute methanol, and mixing the dimethylimidazole and the cobalt nitrate hexahydrate to obtain ZIF-67 powder; the preparation method comprises the following steps: adding graphene oxide into deionized water for ultrasonic dispersion, then adding cellulose powder and ZIF-67 powder, and mixing to obtain a cellulose / graphene oxide / ZIF-67 composite material; and performing high-temperature pyrolysis treatment on the cellulose / graphene oxide / ZIF-67 composite material to obtain the cellulose / graphene oxide / ZIF-67 derived nano composite wave-absorbing material with the hierarchical porous structure. The wave-absorbing material prepared by the invention has the characteristics of thin thickness, light weight, strong absorption and wide frequency band, and effectively solves the problems of serious electromagnetic pollution, insufficient frequency band coverage of the traditional wave-absorbing material and structural design limitation.

The application discloses a method for synthesizing a single-atom catalyst, which comprises the following steps of mixing raw materials: taking dimethyl imidazole, zinc nitrate and graphene oxide as solutes, and taking anhydrous methanol as a solvent to form ZIF-8@GO through stirring; taking ZIF-8@GO and thiourea as solutes, and taking anhydrous methanol as a solvent to form S / ZIF-8@GO through stirring and adsorption; first-stage pyrolysis: pyrolyzing S / ZIF-8@GO in a protective gas atmosphere to form porous carbon (S, N-C); precursor preparation: after the porous carbon is cooled, phenanthroline (Phen) and a transition metal source (M) are added into the porous carbon to form a precursor M / S, N-C@Phen; and second-stage pyrolysis: pyrolyzing the M / S, N-C@Phen precursor in a protective gas atmosphere to obtain a M / S, N-C single-atom catalyst. The synthesis method is simple and effective, can be used for large-scale synthesis of a single-atom catalyst, is suitable for synthesis of various metal single-atom catalysts, and solves the problems of complexity in the prior art and difficulty in large-scale preparation.

The invention discloses a chloroethylene carbonate purification process in the technical field of synthesis of lithium battery additives. The process adopts a novel hierarchical pore asymmetric zirconium organic phosphonate frame material as an adsorbent. The method comprises the following steps: firstly, mixing, heating and stirring crude chloroethylene carbonate and absolute methanol, and standing at room temperature for pretreatment; performing selective adsorption on the pretreatment solution through an adsorption column filled with the adsorption material; carrying out toluene washing, citric acid ethanol solution treatment and supercritical carbon dioxide extraction on the saturated material to realize regeneration; and finally, rectifying the solution subjected to adsorption treatment under a reduced pressure condition to obtain a high-purity product. The adsorption material is prepared through multiple steps of reactions including synthesis and modification of an organic ligand, framework construction of a zirconium source and a phosphonic acid ligand, asymmetric functional modification of the surface of the material, and final thermal activation and hydrophobic stabilization treatment. The process is simple and efficient, the material can be reused, and the method is especially suitable for the field of lithium battery additive synthesis.

This invention relates to the field of functional materials technology, and discloses a ruthenium-based catalyst for the acidic oxygen evolution reaction (OER), its preparation method, and its application. The preparation method includes dissolving 100-200 parts by mass of RuCl3·H2O and 1-40 parts by mass of VCl3 in 20-60 parts by volume of anhydrous methanol, stirring to obtain a mixed solution; slowly adding hydrazine hydrate dropwise to the mixed solution, continuing stirring, centrifuging and filtering; washing alternately with anhydrous methanol and ultrapure water, freeze-drying, and heat-treating at 300-500℃ for 1-4 hours to obtain a V-doped RuO2 catalyst. The prepared V-RuO2 catalyst exhibits excellent initial activity and long-term durability under acidic conditions, providing a new solution for developing high-performance anode catalysts suitable for proton exchange membrane water electrolyzers.

The application relates to a preparation method of a composite semiconductor photocatalyst and application thereof, and comprises the following steps: preparing g-C3N4 nanosheets; dispersing the prepared g-C3N4 nanosheets into methanol at a mass fraction of 10% to 70%, then adding 750 mg of trimesic acid and 150 mg of bismuth nitrate, and ultrasonic treating for 10 min to obtain a mixed suspension; transferring the mixed suspension into a microwave reaction kettle for reaction, the reaction temperature is 90 to 130 DEG C, the reaction time is 30 to 60 min, and centrifugal drying is carried out after the reaction is completed; then g-C3N4 / Bi-MOF is obtained through anhydrous methanol washing and freeze drying; a heterostructure is constructed, the energy band structure is changed, the charge transmission resistance is reduced, the photocatalytic activity is improved, the photocatalyst has two different structure and property photocatalytic activity centers, and the photocatalytic activity is changed from the energy band structure and the catalytic activity.

This invention relates to the field of mineral processing technology, specifically to an environmentally friendly copper-molybdenum separation inhibitor, its preparation method, and its application. The method includes: mixing starch and formamide, stirring at room temperature, cooling in an ice-water bath at -5°C, slowly adding chlorosulfonic acid at this temperature to initiate a sulfonation reaction, neutralizing to pH 7-8 with sodium hydroxide solution after the reaction, adding anhydrous methanol to precipitate the product, and washing and drying to obtain the sulfonated anionic starch polymer DGSS. The inhibitor is applied to the flotation separation of copper-molybdenum mixed concentrates, combined with a closed-circuit process of one roughing, one scavenging, and four cleaning stages, employing a gradient reagent reduction and staged kerosene replenishment system from roughing to cleaning. This allows for selective inhibition of copper sulfide minerals such as chalcopyrite at extremely low dosages, with minimal impact on the floatability of molybdenite. It completely avoids the use of toxic substances such as cyanide, Knox reagent, or sodium sulfide, exhibiting good selectivity, low reagent consumption, environmental friendliness, and a simple preparation process that is easy to industrialize.

The application relates to the technical field of natural medicinal chemistry, and specifically discloses a triterpenoid compound and application, and a preparation method of the compound. The preparation method comprises the following steps: drying and crushing schisandra chinensis roots to obtain dried and crushed schisandra chinensis roots, extracting the dried and crushed schisandra chinensis roots by using 70% ethanol water solution under negative pressure cavitation, combining and concentrating the extract to obtain a crude extract, separating the crude extract by using a D101 macroporous adsorption resin, eluting the crude extract by using water, 30% ethanol, 70% ethanol and 90% ethanol in sequence, collecting a 70% ethanol elution part, performing MCI column chromatography on the 70% ethanol elution part, performing gradient elution on the 70% ethanol elution part by using methanol-water, collecting a depigmentation sample, performing ODS column chromatography on the depigmentation sample, performing gradient elution on the depigmentation sample by using water-methanol, collecting a target component, and purifying the target component by using a preparative high performance liquid chromatograph to obtain the target compound. The application separates a novel triterpenoid compound from schisandra chinensis roots for the first time, expands the development range of medicinal resources of schisandra chinensis plants, simultaneously provides a novel structure mother nucleus and a candidate active molecule for anticancer drug research and development, and enriches the research and development reserves of antitumor natural medicines.

The invention belongs to the technical field of catalyst preparation, and particularly relates to an efficient hydrophobic methanol catalyst and a preparation method thereof.The method comprises the steps that raw materials such as copper salt, zinc salt and aluminum salt are prepared, the total molar ratio of copper to zinc to aluminum is preset, and the zinc salt and the aluminum salt are split according to the deviation smaller than or equal to 10% from the total molar ratio; preparing a first salt solution, a second salt solution, an auxiliary solution and an alkali solution; the method comprises the following steps: establishing a first liquid level of a reaction kettle, adding a first salt solution and alkali liquor in a parallel flow manner at a preset temperature and pH value to construct a core phase, then adding a second salt solution, an auxiliary agent solution and the alkali liquor to form a coating layer, and heating for aging; washing, drying and roasting to prepare a catalyst precursor; preparing a hydrophobic component solution and an oxide precursor solution, mixing and hydrolyzing to obtain a composite hydrophobic solution; and dipping a precursor in the solution, and drying to obtain the product. The problem of water-induced inactivation of a traditional catalyst is solved, the CO2 conversion rate and methanol selectivity are improved, the inactivation rate is reduced, and the process is suitable for industrial production.

The invention relates to the technical field of vegetable and fruit pesticide residue detection, in particular to a method and a system for separating and determining ethiprole enantiomer residue in grapes by ultra performance convergence chromatography. The method comprises the following steps: extracting a sample twice by 1% acetic acid acetonitrile, performing rotary evaporation concentration, redissolving by dichloromethane / methanol, purifying by adopting an amino solid-phase extraction column, concentrating, fixing the volume by isopropanol / n-heptane (1: 9), and filtering. The method comprises the following steps: separating by using a Trefoil CEL2 chiral chromatographic column, carrying out gradient elution at 35 DEG C and 10.3 MPa by using supercritical CO2 as a main mobile phase and 0.5% ammonia water methanol as a modifier, detecting PDA at 280 nm, and carrying out external standard quantification. The method is rapid in separation and good in peak shape, the linear range is 0.5-20.0 mg / L, the LOQ is 0.1 mg / kg, the adding standard recovery rate is 80.0%-108%, the RSD is 3.1%-8.4%, and the method is suitable for monitoring ethiprole enantiomer residues in grapes.

This invention provides a compound for recognizing chiral amino alcohols, a fluorescent probe, its preparation method, and its application. Naphthol and sodium hydride are weighed and dissolved separately in ultra-dry tetrahydrofuran, mixed, and then reacted with bromomethyl methyl ether. The mixture is extracted with ethyl acetate, and the organic phases are combined to obtain product (R)-1. This product is dissolved in ultra-dry tetrahydrofuran, and n-butyllithium is added. The reaction system changes from colorless to brown, and the reaction is allowed to return to room temperature. Ultra-dry N,N-dimethylformamide solution is then added, and the reaction is quenched by adding saturated ammonium chloride solution under ice-water bath conditions. The product is then extracted with ethyl acetate to obtain product (R)-2. Product (R)-2 is dissolved in a mixed solvent of tetrahydrofuran and anhydrous methanol, and sodium triacetoxyborohydride is added. The product is then extracted with ethyl acetate to obtain reduced product (R)-3. Product (R)-3 is dissolved in a mixed solvent of dichloromethane and anhydrous ethanol, and concentrated hydrochloric acid is added. After the reaction is complete, the reaction is quenched with sodium bicarbonate, and then extracted with dichloromethane to finally obtain compound (R)-4, which recognizes chiral amino alcohols.

The application discloses preparation of carbazolyl 3,5-dicyanopyridine derivatives, room temperature phosphor and anti-counterfeiting performance thereof. The preparation method comprises the following steps: adding ortho-, meta- or para-carbazolyl benzaldehyde and malononitrile into a reaction bottle, stirring and reacting under room temperature conditions with sodium hydroxide as a catalyst and anhydrous methanol as a solvent, and obtaining ortho-, meta- or para-carbazolyl 3,5-dicyanopyridine by separating and purifying the reaction crude product. Crystals of the three compounds are obtained by a solvent diffusion method with dichloromethane-petroleum ether as a solvent, and the crystal state room temperature phosphor material is obtained. The crystals are doped with urea / triphenylphosphine at a weight ratio of 1:100, the doped crystals are uniformly ground and mixed, and then heated to be molten, so that the host-guest doped phosphor material is obtained, and the novel material is used in the field of anti-counterfeiting patterns.

The invention discloses a preparation method and application of 1, 4-bis (diphenylphosphine) butane platinum dichloride (II), and the preparation method comprises the following steps: (1) mixing absolute methanol and dichloromethane, carrying out deoxidation treatment, and adding 1, 4-bis (diphenylphosphine) butane into the mixture; (2) dissolving potassium chloroplatinite in distilled water, filtering insoluble impurities, dropwise adding the potassium chloroplatinite into the reaction system in the step (1) under the protection of inert gas while keeping a stirring state, and after dropwise adding, heating, refluxing and stirring for reaction; (3) carrying out filter pressing under the protection of inert gas, passing through a silica gel column, and collecting filtrate; (4) concentrating the filtrate, and then adding an organic solvent for pulping; and (5) carrying out filter pressing under the protection of inert gas, washing a filter cake, and carrying out vacuum drying. According to the preparation method, the product yield is high, the purity is high, and the obtained 1, 4-bis (diphenylphosphine) butane platinum dichloride (II) is used for hydrogenation reaction of carbonyl compounds and has good catalytic performance.

The application provides a method for preparing an M-phase VO2 film by a light-assisted spray pyrolysis method and the M-phase VO2 film prepared by the method, and belongs to the field of nanometer materials. The method comprises the following steps: (1) preparing a vanadium dioxide spraying liquid: adding vanadium oxyacetonylacetone into anhydrous methanol, stirring and aging to obtain a vanadium dioxide spraying liquid with ultraviolet photosensitive properties; (2) preparing a vanadium dioxide film: introducing the vanadium dioxide spraying liquid in step (1) into an atomizer and spraying onto a substrate coated with a TiO2 anatase phase under ultraviolet light irradiation to obtain the M-phase VO2 film. The method enables vanadium ions to be chelated in the sol by stirring, and the vanadium dioxide spraying liquid has ultraviolet photosensitive properties. The purity of the VO2(M) film is improved by introducing a titanium dioxide transition layer, and the microstructure of the VO2(M) film is improved by ultraviolet light irradiation, thereby improving the visual transmittance and solar light regulation rate of the VO2(M) film.

The invention provides a novel crystalline porous organic salt membrane as well as a preparation method and application thereof, and belongs to the technical field of membrane separation. The preparation method of the crystalline porous organic salt film comprises the following steps: adding a PAN film into a NaOH solution for reaction, washing a reaction product, adding the reaction product into an HCl solution for continuous reaction, and washing again to obtain a PAA substrate; the method comprises the following steps: adding a crystalline porous organic salt solid into absolute methanol, then adding ammonia water, carrying out ultrasonic treatment to obtain a solution A, and adding the solution A onto a PAA substrate to obtain the crystalline porous organic salt film. The crystalline porous organic salt membrane provided by the invention is simple in preparation method and low in cost, also has the advantages of high permeation flux and good stability, can efficiently separate water and ethanol, and has excellent selectivity.

The application discloses a metal fluoride-coated silicon-carbon negative material and a preparation method thereof. The preparation method comprises the following steps: S100, performing gas phase deposition on the pore channel and the outer surface of the porous carbon by using a silane gas source and a carbon gas source in an inert gas to obtain a first product; S200, performing drying on the first product, a metal source and an ammonia source after water bath heating and stirring in a solvent, and then performing heat treatment on the obtained solid product in an inert atmosphere to obtain a second product coated with metal oxide, wherein the solvent is one or more of ethanol, distilled water, methanol and acetone; and S300, mixing the second product with ammonium fluoride and performing ball milling, and then performing heat treatment to obtain the metal fluoride-coated silicon-carbon negative material. Firstly, the silicon atoms, the carbon atoms and the carbon atoms on the surface of the porous carbon are chemically bonded by gas phase deposition, and the first product is coated with metal fluoride, which is beneficial to the formation of a stable solid electrolyte interface film and the improvement of the cycle life.

This invention provides a Pt single-atom / cluster co-supported NiCo layered bimetallic oxide material, its preparation method, and its application. The preparation method includes: adding cobalt salt and 2-methylimidazole to an anhydrous methanol solution and stirring at room temperature; after the reaction is complete, centrifuging to collect the product, repeatedly washing, and drying to obtain a zeolite-like imidazolium ester framework material, Co-ZIF; adding Co-ZIF, nickel salt, and platinum source to an anhydrous ethanol solution and stirring at room temperature; after the reaction is complete, centrifuging to collect the product, repeatedly washing, and drying to obtain a Pt-supported NiCo layered bimetallic hydroxide material; and calcining the Pt-supported NiCo layered bimetallic hydroxide material to obtain a Pt single-atom / cluster co-supported NiCo layered bimetallic oxide material. The material of this invention exhibits excellent catalytic activity, demonstrating superior activity and stability in the hydrogen evolution reaction in alkaline electrolytes.

The invention relates to the technical field of adsorption materials, and particularly discloses a molecularly imprinted hydrogen bond organic framework adsorption material as well as a preparation method and application thereof. According to the material, tetra (4-sulfonyl phenyl) methane and 1, 1 '-diamino-4, 4'-dipyridyl diiodide are used as construction units to form a hydrogen bond organic framework substrate, and a hemp essence drug template molecule is introduced to construct a specific imprinting hole in the hemp essence drug template molecule. The preparation method is characterized in that the molar ratio X of template molecules to tetra (4-sulfonyl phenyl) methane is controlled to be 0.05-0.5, crystallization is performed in a water / methanol mixed solvent, and then elution and activation are performed through an acid solution with the pH being 2-4. The material has the advantages of high adsorption capacity, no less than 58 mg / g of template molecule adsorption capacity, high selectivity and rapid adsorption kinetics, achieves balance within 5 minutes, can efficiently enrich trace hemp extract drugs from a water environment or biological fluid, and solves the technical problem that the selectivity, the capacity and the mass transfer rate of the existing adsorption material are difficult to consider at the same time.

The invention discloses a Fe-modified TiO2 hollow microsphere photo-Fenton catalyst as well as a preparation method and application thereof, and relates to the technical field of catalyst preparation, and the preparation method comprises the following steps: preparing TiO2 microspheres with hollow structures from hexadecyl trimethyl ammonium bromide, absolute methanol, deionized water and tetrabutyl titanate; the method comprises the following steps: mixing ferrocene and 0.25 C-TiO2 powder, putting the mixture into a quartz tube, putting the quartz tube into a muffle furnace, heating and pyrolyzing according to a two-stage program, alternately washing black powder with absolute ethyl alcohol and deionized water after the pyrolysis is finished, and drying to obtain a sample CT-5Fe; the preparation method comprises the following steps: dispersing CT-5Fe in an H2O2 solution, carrying out a water bath reaction, collecting a gray product, carrying out centrifugal operation, washing, and drying to obtain the Fe-modified TiO2 hollow microsphere photo-Fenton catalyst, namely CT-5Fe-HO. According to the invention, a photocatalysis-Fenton-like coupling system for phenol degradation is constructed, the PMS adsorption and activation capability is enhanced, high activity and good cycle stability are maintained in a wide pH range and in a complex water body, and a solution is provided for water body pollution treatment.

The invention discloses a method for extracting and separating baicalin and baicalein, which comprises the following steps: S1, weighing thymol and menthol, adding the thymol and the menthol into a three-neck flask, and heating and stirring to form uniform and transparent liquid as an extracting agent thymol-menthol eutectic solvent; s2, mixing the radix scutellariae powder with a 50% ethanol solution, heating, condensing and refluxing twice to obtain an extracting solution, centrifuging, taking supernate, and concentrating to obtain a radix scutellariae extracting solution. And S3, putting the scutellaria baicalensis extracting solution and an extracting agent into a high-pressure extraction kettle, carrying out pressurized extraction, transferring to a separating funnel, standing for layering, and respectively collecting. And S4, adding water into the lower-layer water phase for dilution, filtering, heating and stirring, standing at low temperature for crystallization, carrying out suction filtration, washing and drying to obtain purified baicalin. And S5, adding ethyl acetate into the upper-layer extraction phase, oscillating and standing, collecting the lower-layer ethyl acetate, adding anhydrous sodium sulfate, filtering, concentrating, adding absolute methanol, standing at low temperature, crystallizing, carrying out suction filtration, washing and drying to obtain purified baicalein. According to the method for extracting and separating the baicalin and the baicalein, the yield and the purity of the baicalin and the baicalein can be improved.

This invention discloses a solid sodium aminosulfonate β-H elimination promoter, its preparation method, and its application, relating to the technical field of β-H elimination promoters. The technical solution is as follows: S1, diethylenetriamine is dissolved in an organic solvent; S2, chlorosulfonic acid organic solution is added dropwise to the diethylenetriamine organic solution at 0-10℃ to carry out the reaction; after the addition is complete, the temperature is raised to continue the reaction; S3, the white solid generated by the reaction is filtered and washed with chloroform and ethanol respectively. The washed white solid is poured into anhydrous methanol and dispersed evenly. The reaction temperature is lowered to 0℃, sodium hydroxide is added for neutralization, and the solvent is removed by vacuum distillation. The resulting pale yellow solid is washed with ethanol and finally dried under vacuum to obtain the solid sodium aminosulfonate β-H elimination promoter. The solid sodium aminosulfonate β-H elimination promoter prepared by this invention has advantages such as high metal salt content, strong alkalinity, and easy separation, making it a promising additive for industrial application.

The invention provides a polyamidoxime uranium adsorbent as well as a preparation method and application thereof, and belongs to the technical field of macromolecular adsorption materials. The preparation method of the polyamidoxime uranium adsorbent comprises the following steps: dispersing polyacrylonitrile microspheres in a water-methanol mixed solvent to obtain a water-methanol solution of the polyacrylonitrile microspheres; dissolving hydroxylamine hydrochloride in water to obtain a hydroxylamine hydrochloride aqueous solution; dropwise adding the alkaline solution into the hydroxylamine hydrochloride aqueous solution, uniformly mixing and stirring, and adding methanol to obtain a free hydroxylamine water-methanol solution; a water-methanol solution of polyacrylonitrile microspheres and a free hydroxylamine water-methanol solution are mixed to obtain a reaction solution, and the polyamidoxime uranium adsorbent is obtained after a heating reaction. Wherein the methanol content in the free hydroxylamine water-methanol solution and the methanol content in the water-methanol solution of the polyacrylonitrile microspheres are the same and are both 16-66 vol%.

The invention relates to the technical field of zinc-air batteries, and particularly discloses a quasi-solid zinc-air battery cathode material as well as a preparation method and application thereof. According to the cathode material, carbon black particles with aminated surfaces are used as a carrier, and ruthenium-cobalt bimetallic active components are loaded as a catalytic center. The preparation method of the cathode material comprises the following steps: dispersing aminated carbon black particles, ruthenium metal salt and cobalt metal salt in a water / methanol mixed solution, carrying out ultrasonic dispersion, and carrying out a hydrothermal reaction at a certain temperature; centrifuging, washing and drying the reaction product to obtain a solid precursor; and finally, carrying out thermal annealing treatment on the solid precursor under the inert gas protection condition to obtain the cathode material. The cathode material provided by the invention is suitable for an air cathode of a quasi-solid-state zinc-air battery, and has good catalytic activity and application prospect.

This invention relates to the field of biomaterial synthesis technology, specifically disclosing a method for preparing a class of catechol derivatives and their applications, administration, and preparation apparatus. The methods include: preparing dopa or carbidopa derivatives using a sodium sulfite-boric acid-argon protective system in an organic-aqueous mixture; or using dopa as a raw material, performing a methyl esterification reaction with SOCl2 and anhydrous methanol, followed by an exchange reaction with methyl trifluoroacetate to achieve a one-pot synthesis of Tfa-DOPA-OMe; or preparing acetal-protected tanshinone derivatives based on dopa derivatives or tanshinone and its derivatives; or using acetal-protected tanshinone and its esters to prepare natural catechol compounds such as Shimobashiric acid C, and preparing non-natural catechol compounds through coupling reactions with organic acids, amino acids and their derivatives, oligopeptides and polypeptides, alcohols, or sugars. Highly selective deprotection conditions achieve the goal of completely and thoroughly removing the acetal protection of catechols without destroying the ester bonds within the molecular structure.

The application provides a preparation method of a cooling agent WS-23, and belongs to the technical field of cooling agents, and comprises the following steps: step S1, adding DIPPN and anhydrous methanol into a reaction kettle, uniformly mixing, introducing N2, controlling temperature, introducing HCl, increasing temperature under pressure, stirring and reacting, decreasing temperature and releasing pressure, neutralizing, extracting, washing, drying, filtering, rotary evaporation to obtain an intermediate crude product; step S2, preparing a WS-23 crude product; step S3, adding the WS-23 crude product into anhydrous ethanol, heating and stirring, adding hexane, uniformly mixing, hot filtering to obtain a clear solution, cooling, heat preservation crystallization, suction filtration, washing, vacuum drying, and obtaining the cooling agent WS-23. The application can improve the yield and purity of the cooling agent WS-23.

The invention belongs to the technical field of catalyst preparation, and discloses a method for preparing a copper-zinc-based catalyst by a complexing recrystallization method, which comprises the following steps: step 1, dissolving a copper-containing solid and a zinc-containing solid in an ammonia-containing solution, and heating and stirring in a closed environment to obtain a complex solution containing copper ammonia and zinc ammonia complexes; the solvent component of the ammonia-containing solution is any one or a mixture of more of water, methanol and ethanol; step 2, cooling the complex solution added with the auxiliary agent so as to separate out a precipitate from the complex solution; 3, filtering the precipitate, and washing the obtained filter cake with a solvent; and carrying out drying, roasting and compression molding on the filter cake to obtain the catalyst. According to the method, long-time heating is not needed, the heating temperature is limited, precipitation is obtained in a cooling crystallization mode subsequently, no extra energy needs to be consumed basically, meanwhile, pollution of products and by-products is small, and environmental protection is facilitated.

The invention belongs to the technical field of metal material micro analysis / welding processes, and particularly relates to an in-situ imaging method for the three-dimensional morphology of small-size inclusions of weld metal. According to the method, a weld metal sample is sequentially subjected to annealing, grinding and polishing, electrolysis and scanning electron microscope sample preparation, and an observable sample is obtained; wherein an organic electrolyte used for electrolysis is prepared from the following components in percentage by mass: 0.9 percent to 1.1 percent of tetramethylammonium chloride, 0.3 percent to 0.8 percent of triethanolamine, 8 percent to 12 percent of acetylacetone, 4 percent to 6 percent of glycerol, 0.4 percent to 0.8 percent of diphenylguanidine, 0.2 percent to 0.4 percent of triphenylphosphine oxide, 0.08 percent to 0.15 percent of sodium metavanadate and the balance of absolute methanol. According to the method, the three-dimensional morphology of the inclusions in the weld metal can be developed in situ.

The invention relates to the technical field of biochemical detection, in particular to a pretreatment method of a propofol-containing sample, a propofol detection method and a kit. The pretreatment method of the propofol-containing sample comprises the following steps: providing the propofol-containing sample; the method comprises the following steps: adding porous polymer lipophilic magnetic beads into a sample, carrying out adsorption treatment, and then carrying out leaching treatment by using water and a methanol solution in sequence to obtain a propofol-magnetic bead compound; and eluting the propofol-magnetic bead compound by using an ammonia water methanol solution to obtain a sample to be detected. The pretreatment method provided by the invention is simple in process and low in cost, the to-be-detected sample containing propofol can be efficiently obtained, and the to-be-detected sample containing propofol can be subsequently used for high-sensitivity detection of propofol by an ion mobility spectrometry technology, so that the pretreatment method has a very good application prospect in the field of propofol detection.

The application belongs to the technical field of electrode material preparation and electrocatalytic wastewater treatment, and specifically provides a sewage treatment electrocatalytic electrode material, a preparation method thereof and application thereof in sewage treatment. The preparation method of the electrocatalytic electrode material is as follows: a zinc nitrate solution, a cobalt nitrate anhydrous methanol solution A and a 2-methyl imidazole anhydrous methanol solution B are configured, the A and B solutions are mixed and then subjected to a solvothermal reaction in an oven to obtain Co1 / Zn2-ZIF-8, the Co1 / Zn2-ZIF-8 is mixed with carboxymethyl cellulose and then subjected to freeze drying to obtain aerogel, and the aerogel is subjected to sulfuration in a tube furnace in an inert gas atmosphere to obtain the electrocatalytic electrode material. The electrocatalytic electrode material prepared by the method has the advantages of simple preparation method, low raw material cost and wide application prospect in the field of sewage treatment.

The present application relates to blood trace detection technical field, specifically relates to a kind of blood trace developing agent and its developing method and application.The blood trace developing agent of the present application includes disperse dye and solvent;The concentration of the disperse dye is 2%~4%, and the solvent is water, methanol, anhydrous ethanol, mordant aqueous solution, glacial acetic acid aqueous solution, glacial acetic acid methanol mixed solution, glacial acetic acid ethanol mixed solution or disperse agent mordant mixed aqueous solution.The blood trace developing agent provided by the present application is widely applicable, can make the blood trace on various different types of object appear, the blood handprint line of appearance is coherent, high definition, object background is not dyed or slightly dyed, line and background contrast is big, with good appearance effect best.

The invention belongs to the technical field of spice raw material synthesis, and particularly relates to a synthesis method of methyl cis-dihydrojasmonate, which comprises the following steps: dissolving 1-heptyne in toluene, discharging into a first reaction tank, adding a cobalt catalyst, and discharging 1-bromine-ethylene and carbon monoxide gas into the first reaction tank; adding triphenylphosphine into a first catalyst recovery tank, discharging catalyst precipitates, and carrying out sectional distillation to distill, cool and recover 1-heptyne; absolute methanol is discharged into the layering tank; dimethyl malonate is discharged into a second reaction tank, sodium methoxide is slowly added, an addition reaction is carried out at the temperature of-5 DEG C to 0 DEG C, and then heating is carried out for a decarboxylation reaction; 4-bromo-dihydrojasmonic acid methyl ester obtained by distillation is discharged into a third reaction tank; and discharging methyl jasmonate with alpha, beta-double bonds into a fourth reaction tank for reaction. By simplifying the steps, improving the recovery rate of the catalyst and realizing continuous production, the problems of high cost, low yield, low recovery rate of the catalyst and the like in preparation of the methyl cis-dihydrojasmonate in the prior art are solved.