259 results about "Sodium hydride" patented technology

The invention provides a GelMA microneedle patch loaded with chromogenic gold nano bipyramids and a preparation method thereof.The method comprises the steps that citric acid, chloroauric acid and a CTAC solution are mixed, then sodium borohydride is added, and a seed solution is obtained through stirring and standing; mixing chloroauric acid, silver nitrate, hydrochloric acid and CTAB (cetyltrimethyl ammonium bromide), and sequentially adding ascorbic acid and the seed solution to obtain a growth solution; carrying out centrifugation, morphology regulation and chemical etching purification to obtain a chromogenic gold nano bipyramid solution; the preparation method comprises the following steps: reacting gelatin with methacrylic anhydride in PBS, dialyzing and freeze-drying to obtain GelMA; dissolving GelMA in the gold nanoparticle bipyramid solution, and adding a photoinitiator LAP to obtain a mixed precursor solution; and the GelMA microneedle patch loaded with the gold nano bipyramid is prepared through mold casting, centrifugation, ultraviolet light crosslinking and drying demolding. The microneedle extraction and gold nano bipyramid color development integrated scheme is initiated, blood sampling is not needed, the dermis interstitial fluid is extracted in a minimally invasive mode through the microneedle, detection pain and trauma are reduced, the cross infection risk of blood treatment is avoided, and the microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle microneedle

This application provides a method for preparing compound I-b or a pharmaceutically acceptable salt thereof, wherein (S)-N-methylamino-1-(2-thiophene)-1-propanol reacts with 4-fluorobenzo[1,3]dioxolane in a system containing sodium hydride and potassium benzoate to obtain compound I-b. This method has short steps, mild reaction conditions, and is simple to operate, making it suitable for industrial scale-up; moreover, the obtained product has high purity and low isomer content.

The invention relates to the technical field of chemical synthesis, and discloses a method for preparing 2, 5-furandicarboxylic acid, which comprises the following steps: dispersing cobalt nitrate and nickel sulfate into an aqueous solution of polyvinylpyrrolidone at room temperature; adding a sodium borohydride solution to obtain nano colloid; preparing an aqueous suspension of cerium oxide, and adding the aqueous suspension into the nano colloid; centrifugally filtering, and recovering a solid product; washing the solid product; centrifuging, putting solid powder obtained after centrifuging into a drying oven, and drying; and calcining and grinding the solid powder to finally prepare the Co-Ni / CeO2 catalyst. And dissolving 5-hydroxymethylfurfural in water at normal temperature, adding the prepared Co-Ni / CeO2 catalyst and a sodium hypochlorite solution, reacting, and filtering to remove the catalyst, thereby obtaining the 2, 5-furandicarboxylic acid. The method disclosed by the invention has the advantages of no use of strong base, low reaction temperature, short reaction time, few byproducts, greenness and sustainability.

The invention relates to a RuSe2-MoSe2 / NF heterojunction bifunctional catalyst for fully hydrolyzed seawater as well as a preparation method and application of the RuSe2-MoSe2 / NF heterojunction bifunctional catalyst, and belongs to the technical field of seawater electrolysis electrocatalysis. The preparation method of the bifunctional catalyst comprises the following steps: (1) mixing deionized water and absolute ethyl alcohol, and magnetically stirring to obtain a mixed solvent; then adding sodium borohydride and selenium powder into the mixed solvent, and stirring until the mixture is completely dispersed to obtain a mixed solution; adding sodium molybdate dehydrate and ruthenium trichloride into the mixed solution, introducing high-purity nitrogen, replacing air, and continuing magnetic stirring to obtain a dark brown precursor mixed solution; and (2) completely immersing the pretreated nickel foam NF in the precursor mixed solution, carrying out hydrothermal reaction, cooling to room temperature after the reaction, taking out the nickel foam NF, washing with deionized water for 3-5 times, then washing with absolute ethyl alcohol for 3-5 times, and drying to obtain the nickel foam NF. The bifunctional catalyst provided by the invention can efficiently catalyze a hydrogen evolution reaction and an oxygen evolution reaction in seawater at the same time.

The invention provides a preparation method of a magnetic recoverable catalyst and a method for synthesizing 3-mercaptopropionic acid, and mainly solves the problem that a large amount of acid and alkali solutions are needed in the existing acrylonitrile-sodium hydrosulfide and acrylic acid-thiourea process routes. The thiohydracrylic acid synthesis catalyst is prepared. The use conditions of the catalyst are as follows: the temperature is 30-80 DEG C, the reaction pressure is 0.5-3 MPa, the mass ratio of the acrylic acid to the solvent is 0.1-5, and the mass ratio of the acrylic acid to the catalyst is 0.2-20. Compared with the prior art, the catalyst disclosed by the invention is used as a synthetic catalyst for preparing thiohydracrylic acid through reaction of acrylic acid and hydrogen sulfide, a solid catalyst and a liquid reaction system can be completely separated by adopting simple methods such as filtration, centrifugation or magnetic separation, and a complicated pickling step is not needed; and the problem that a homogeneous catalyst is difficult to rectify after salification in the use process is avoided.

The invention discloses a preparation method of an MF (at) NH2 (at) Ag SERS (Surface Enhanced Raman Scattering) sensor for detecting paraquat and diquat, belongs to the field of nano material synthesis and spectral analysis, and solves the problems that a traditional detection method is complicated in process and cannot detect pesticides and free radicals thereof at the same time, and a traditional SERS substrate is poor in enhancement effect and low in stability. The preparation method comprises the following steps: firstly segmenting melamine foam, cleaning and drying, soaking in hydrochloric acid, soaking in a polyethyleneimine aqueous solution to modify amino, drying, soaking in a silver nitrate solution for ultrasonic treatment, adding a sodium borohydride solution under an ice bath, stirring and reducing, and finally cleaning and drying to obtain the sensor. The sensor takes three-dimensional melamine foam as a support, silver nanoparticles are uniformly loaded on the surface of the three-dimensional melamine foam, paraquat, aquacide and free radicals thereof are enriched through electrostatic interaction based on a localized surface plasma resonance principle, and Raman signal enhancement is realized. The detection limit is 10 <-9 > mol / L, the signal stability and repeatability are excellent, the applicability to actual water sample detection is good, the detection of other pesticides can be expanded, and the method is suitable for on-site rapid trace detection.

The invention discloses preparation and application of a heterogeneous element doped oxide composite catalyst. The preparation method comprises the following steps: stirring an iron source, carbon nanotubes and triton in a solvent, adding a sodium borohydride solution at 2-10 DEG C, and rapidly stirring and uniformly mixing; aging the solution at 2-10 DEG C, collecting a sample, washing and drying; carrying out heat treatment to obtain a gamma-Fe2O3 precursor loaded on the carbon nano tube; stirring the gamma-Fe2O3 precursor loaded on the carbon nano tube and a heterogeneous element source in a solvent, evaporating to dryness and grinding; and performing heat treatment to obtain the composite catalyst. The gamma-Fe2O3 and carbon nanotube in-situ loaded composite material is used as a precursor, the structural stability of the substrate is effectively improved, meanwhile, the intrinsic catalytic activity of the gamma-Fe2O3 can be effectively improved through doping of multi-element heterogeneous elements, and compared with a fractional-step doping strategy, higher catalytic activity and higher utilization value are shown.

The application belongs to the technical field of fluorescent probe detection, and discloses a bimetallic nanocluster fluorescent probe compound and application thereof in preparation of a product for rapidly detecting acetylene. The fluorescent probe compound is a gold-copper bimetallic nanocluster solution modified by adamantane thiol, which is used as a fluorescent probe for acetylene detection. The solution has a clear and controllable preparation process. Through specific proportioning and reaction conditions of cuprous chloride, adamantane thiol, tetrachloroauric acid, sodium borohydride and other reagents, a probe solution with stable fluorescence characteristics can be prepared. The bimetallic nanocluster fluorescent probe compound is applied in preparation of a product for rapidly detecting acetylene. Through specific combination of fluorescent molecules and acetylene gas to trigger the secondary effect of fluorescence quenching, detection is realized, and other substances cannot trigger quenching. At a wavelength of 700 nm, the linear relationship (R 2 >0.99) between the fluorescence intensity and the acetylene concentration realizes accurate quantification of the acetylene concentration, and the minimum detection limit is 0.026 muL / L.

The invention belongs to the technical field of hydrogen production, and discloses a preparation method of a nickel-based catalyst based on expanded graphite dispersion and application of the nickel-based catalyst in ammonia cracking hydrogen production, and the preparation method comprises the following steps: (1) uniformly dispersing expanded graphite in deionized water; (2) adding nickel chloride hexahydrate and cerium chloride heptahydrate to be uniformly dispersed on the surface of the expanded graphite; (3) adding sodium borohydride into the mixture for reduction, centrifugation and washing; (4) calcining the solid obtained by centrifugation, oxidizing and crystallizing Ce (III) in a high-temperature environment to form CeO2; and (5) reducing under a pure hydrogen condition to obtain the Ni / CeO2-expanded graphite catalyst. The catalyst is a three-dimensional precursor formed by nickel chloride, cerium chloride and expanded graphite through a reduction method, Ni and CeO2 are dispersed and fixed on the expanded graphite, and the catalyst shows excellent catalytic activity in an ammonia decomposition reaction through a confinement effect of the expanded graphite and an electron transfer synergistic effect.

The utility model relates to the technical field of chemical engineering, in particular to a sodium hydrogen sulfide solution storage tank flushing system which comprises a magnetic turning plate liquid level meter, a remote transmission liquid level meter, a sodium hydrogen sulfide storage tank, a condensation water pipeline, an upper flushing line, a lower flushing line and a remote transmission flushing line. A lower end inlet of the magnetic flap liquid level meter is connected with a lower end drain valve; a first short-circuit wire is led out from the sodium hydrosulfide storage tank to be connected to an outlet in the upper end of the magnetic flap liquid level meter, a second short-circuit wire is led out from the sodium hydrosulfide storage tank to be connected to an outlet in the lower end of the magnetic flap liquid level meter, a third short-circuit wire is led out from the sodium hydrosulfide storage tank to be connected to the remote transmission liquid level meter, and a remote transmission shower valve is arranged on the third short-circuit wire. On-line flushing of the sodium hydrogen sulfide solution storage tank is achieved, when liquid level display is different from remote liquid level, water flushing is carried out, checking is carried out again after flushing, and the operation risk is reduced.

The invention discloses a nano SiO2 composite iron microsphere toughening agent for well cementation cement, and belongs to the technical field of petroleum and natural gas well cementation engineering materials. The preparation method of the flexibilizer comprises the following steps: adding ferric trichloride into ethylene glycol, and stirring and dissolving at normal temperature to obtain a solution A; the preparation method comprises the following steps: adding polyvinylpyrrolidone into ethylene glycol, stirring and dissolving at a certain temperature to obtain a solution B, and then adding sodium citrate to prepare a solution C; tetraethoxysilane is added into deionized water and then mixed with the solution A, a hydrolysis reaction of tetraethoxysilane is carried out, and a solution D with nano SiO2 is prepared; gradually and slowly dropwise adding the solution D into the solution C at a certain temperature, and carrying out a first oxidation-reduction reaction; cooling to room temperature, adding sodium borohydride, and carrying out a second oxidation-reduction reaction; and filtering, washing and drying the solution to obtain the flexibilizer. The cement stone is endowed with high toughness and compressive strength through the synergistic effect of the iron elementary substance and the nano SiO2, and the cement stone has a wide market prospect.

The invention discloses a preparation method of a bilastine intermediate, which comprises the following steps: reacting a compound 5 with thionyl chloride under the conditions that dichloromethane is used as a solvent and DMF (Dimethyl Formamide) is used as a catalyst to generate acyl chloride, and then reacting the acyl chloride with diethylamine to prepare a compound 6; taking dichloromethane as a solvent, and carrying out Friedel-Crafts acylation on the compound 6 and ethyl oxalyl chloride under the condition of anhydrous aluminum trichloride to obtain a compound 7; reducing the compound 7 by using sodium borohydride, liquid caustic soda and a water system to prepare a compound 8; taking dichloromethane as a solvent, and reducing the compound 8 by TMDS under the condition of anhydrous aluminum trichloride to prepare a compound 9; hydrolyzing the compound 9 under the hydrochloric acid condition to obtain a compound 10; and under the condition of thionyl chloride, carrying out esterification reaction on the compound 10 and methanol to prepare the bilastine intermediate TM. The preparation method of the bilastine intermediate, provided by the invention, has the advantages of economical and easily available raw materials, mild reaction conditions, efficient reaction and simple operation, and is suitable for industrial application.

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.

This invention discloses a method for preparing and applying a sodium borohydride-modified self-supporting anode for AEM water electrolyzers. Firstly, an amorphous ternary metal hydroxyl oxide precursor is grown in situ on a nickel substrate via room temperature liquid phase deposition. The process involves the presence of Co in solution. 2+ Fe 3+ Ni ions are introduced through slight corrosion of the nickel foam matrix. 2+ The ions, the three, and the OH- produced by hydrolysis ⁻ Co-deposition occurs under the influence of dissolved oxygen, leading to the self-assembly of amorphous nanosheet structures on the substrate surface. Subsequently, a mild chemical reduction treatment with sodium borohydride solution is used to obtain a structurally stable and high-performance self-supporting electrode. The method described in this embodiment is mild, simple, low-cost, and has good versatility.

The invention relates to the technical field of chemical material preparation, and particularly discloses a safe preparation method of a short fluorocarbon alkyl sulphobetaine surfactant, a product and application, and the safe preparation method comprises the following steps: (1) in a solvent system I, reacting epoxy chloropropane with secondary amine to obtain an intermediate 1; (2) in a solvent system II, reacting the intermediate 1 with sodium hydrosulfide or a hydrate thereof to obtain an intermediate 2; (3) reacting the intermediate 2 with short fluorocarbon alkyl iodide to obtain perfluoroalkyl thioether propyl tertiary amine; and (4) carrying out sulfonation treatment on perfluoroalkyl thioether propyl tertiary amine to obtain the short-fluorocarbon alkyl sulphobetaine surfactant. According to the invention, by designing a synthetic route without using a high-risk reagent, the safety and operability of the process are remarkably improved, and the sulphobetaine surfactant with excellent acid, alkali and salt chemical stability and excellent surface activity is successfully prepared; and a key material and a safe and reliable preparation process are provided for development of a new-generation efficient environment-friendly fire extinguishing agent.

The invention discloses a colorimetric detection method for cMyBP-C protein based on nano-enzyme activity, preparation of a bismuth selenide / nano-gold composite material and application of the bismuth selenide / nano-gold composite material in protein detection. The method comprises the following steps: performing ultrasonic stripping on a bismuth selenide block to obtain a few-layer bismuth selenide dispersion liquid; and then sequentially adding a sodium borohydride aqueous solution and a chloroauric acid aqueous solution under a stirring condition, and carrying out in-situ reduction to form gold nanoparticles loaded on the surface of bismuth selenide. The composite material has the capability of catalyzing reduction of p-nitrophenol into p-aminophenol, and the color of the solution is changed from yellow to colorless. After the cMyBP-C antibody is modified on the surface of the composite material, the catalytic activity is inhibited; after a to-be-detected sample is added, the antibody and the protein are specifically combined to cause dissociation, and the catalytic activity is recovered. The cMyBP-C protein is quantitatively detected by observing the color change of the solution or monitoring the reduction of the ultraviolet absorbance at 400 nm.

The invention discloses antioxidant neodymium iron boron permanent magnet powder and a preparation method thereof, and the preparation method comprises the following steps: mixing neodymium iron boron permanent magnet powder, a polyvinylpyrrolidone solution, a sodium borohydride solution and a ferrite solution under an anoxic condition, and carrying out a hydrothermal reaction to obtain the antioxidant neodymium iron boron permanent magnet powder. According to the oxidation-resistant neodymium-iron-boron permanent magnet powder prepared by the preparation method disclosed by the invention, a compact oxidation-resistant shell protection layer is formed on the surface of the neodymium-iron-boron permanent magnet powder, so that oxygen and moisture are effectively blocked, the magnetic powder is prevented from being oxidized, the service life of the magnetic powder is prolonged, and the magnetism of the permanent magnet powder can be ensured not to be influenced; the optimal balance between the anti-oxidation protection and the magnetic performance maintenance of the neodymium-iron-boron permanent magnet powder is realized; meanwhile, the permanent magnet powder does not need to be isolated from air, subsequent neodymium-iron-boron magnet manufacturing can be carried out in the air, the storage cost is reduced, safe use of the permanent magnet powder is guaranteed, and the permanent magnet powder is suitable for large-scale batch continuous production.

The utility model belongs to the field of chemical production technology especially sodium hydride hydrogenation self -absorption dispersion reaction unit, including the stirring bucket, the circular arc surface fixed mounting of stirring bucket has the support rod, multiple support rod around the circular arc surface of stirring bucket is circular array setting, be provided with fully stirring mechanism in stirring bucket, fully stirring mechanism realizes sodium hydride hydrogenation fully complete stirring action. This sodium hydride hydrogenation self -absorption dispersion reaction unit, through setting fully stirring mechanism, can make sodium hydride liquid and hydrogen in stirring bucket carry out fully stirring reaction, make stirring main shaft and stirring vice axle mutual cooperation, realize two angle liquid stirring, make the liquid quality after stirring reaction is completed higher.

This invention discloses a low-functionality photocurable resin and its preparation method, comprising: dissolving polybenzimidazole in a polar aprotic solvent in an inert gas atmosphere to obtain a polybenzimidazole solution; adding sodium hydride in a molar amount equal to 0.8–1.2 times the molar amount of the polybenzimidazole resin to the polybenzimidazole solution, reacting the mixture, then adding allyl bromide in a molar amount equal to 0.8–1.2 times the molar amount of the polybenzimidazole resin, reacting again to obtain a polybenzimidazole prepolymer; dissolving the polybenzimidazole prepolymer in a polar aprotic solvent, adding a crosslinking agent and a photoinitiator, and mixing to obtain a photocurable resin solution; irradiating the photocurable resin solution with ultraviolet light, and drying to obtain a photocurable resin with a functionality of 20%–44%. This invention features a low allyl content, allowing for the curing of aromatic resins with less crosslinking agent, and the cured resin exhibits excellent heat resistance and ultra-high mechanical strength.

The invention provides a method for removing chemical oxygen demand by using a catalyst prepared from acid mine wastewater, which comprises the following steps: recovering valuable elements in the acid mine wastewater, accurately adding sodium hydrosulfide to control conditions, recovering transition metal elements with catalytic activity in the acid mine wastewater by fractional precipitation, directionally preparing a nano-scale metal catalyst, and removing the chemical oxygen demand by using the catalyst prepared from the acid mine wastewater. And the chemical oxygen demand in the wastewater is degraded through the prepared nano-scale metal catalyst, so that the problem of environmental pollution caused by the mine wastewater and the wastewater containing the chemical oxygen demand is solved, and the dual effects of resource recovery and environmental treatment are realized.

The invention relates to the field of cables, and discloses an aerial insulated cable, a protective layer of which is prepared from the following materials: low-density polyethylene, nitrile rubber, ethylene-vinyl acetate copolymer, modified composite filler, functional additive and the like. The modified composite filler is prepared by grafting a modified silane coupling agent and Na-montmorillonite loaded titanium dioxide; the modified silane coupling agent is prepared by reacting p-hydroxybenzaldehyde with phosphorus oxychloride, then carrying out addition with DOPO (9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide), reacting the obtained product with p-aminodiphenylamine, and then carrying out substitution with 3-chloropropyltriethoxysilane; the functional additive is prepared by the following steps: reacting 3, 5-di-tert-butyl-4-hydroxybenzaldehyde with 2-amino-4-methylbenzothiazole, then adding sodium borohydride for reductive amination, substituting the obtained product with cyanuric chloride, and then reacting with N-butyl-2, 2, 6, 6-tetramethyl-4-piperidylamine, and the functional additive is prepared by the following steps: reacting 3, 5-di-tert-butyl-4-hydroxybenzaldehyde with 2-amino-4-methylbenzothiazole; and the protective layer material is endowed with good flame retardance, antibacterial property and long-acting aging resistance.

The application discloses a preparation method of zolmitriptan, relates to the technical field of drug synthesis, and comprises the following steps: adding compound 1 and reagent 1 into solvent 1 to perform a first reaction to obtain compound 2; adding the compound 2, reagent 2 and reagent 3 into solvent 2 to perform a second reaction to obtain compound 3 and the like. Compared with the prior art, the application provides a novel synthetic route for preparing zolmitriptan, the route uses L-4-bromophenylalanine as a starting material, and new synthetic steps are adopted, such as using reagent 5, such as a t-butyl alcohol metal salt and sodium hydride, to construct the oxazolidinone structure in zolmitriptan and using a coupling reaction to construct the indole ring in zolmitriptan, so that the yield of the obtained target product is significantly improved, the use of high-toxicity and high-risk reagents in the existing synthetic route is effectively avoided, and a mild, efficient, green and environmentally-friendly synthetic route for preparing zolmitriptan is provided.

The application provides a flexible functionalized eggshell membrane and a preparation method and application thereof. The preparation method comprises the following steps: dispersing graphene oxide in deionized water to form a graphene oxide dispersion solution, adding sodium borohydride as a reducing agent for reduction, and centrifuging to obtain reduced graphene oxide nano powder; washing the eggshell, placing the eggshell in white vinegar for ultrasonic treatment, peeling the eggshell membrane, rinsing the eggshell membrane with ultrapure water to remove residual substances, and then soaking the eggshell membrane in sodium hydroxide for ultrasonic treatment, and rinsing the eggshell membrane with deionized water to obtain a pretreated eggshell membrane; adding dopamine into Tris buffer solution and fully oscillating to obtain a polydopamine precursor solution; adding the pretreated eggshell membrane and the reduced graphene oxide nano powder into the polydopamine precursor solution, and oscillating for polymerization at a constant temperature to obtain the flexible functionalized eggshell membrane. The application functionalizes the waste eggshell membrane and converts the waste eggshell membrane into a material with high value, thereby providing a method for high-value recycling of the waste eggshell membrane, and the application has great value.

The invention discloses a method for recovering HF (hydrogen fluoride) from hydrofluoric acid waste liquid obtained in an aromatic fluoride industrial synthesis process. According to the HF recovery method provided by the invention, sodium fluoride is taken as a carrier, excessive sodium fluoride reacts with hydrogen fluoride in the hydrofluoric acid waste liquid to generate sodium bifluoride, and HF is released through suction filtration, drying and thermal liberation. The HF is subjected to adsorption-desorption circulation through NaF, so that the purpose of recycling HF without discharging three wastes is achieved; meanwhile, the filtrate returns to the aromatic fluoride industrial synthesis process to be recycled as an absorbent of diazonium salt pyrolysis tail gas; the obtained sodium fluoride is recycled as an HF adsorbent, so that the effect of recycling multiple resources is achieved.

The invention provides a preparation method of selenium nanoparticles based on polyvinylpyrrolidone modification, which comprises the following steps: S1, reduction reaction: under the protection of inert gas, carrying out reduction reaction on a selenium source and sodium borohydride in an aqueous solution at room temperature to generate a sodium hydrogen selenide intermediate; s2, stabilizing reaction: adding a polyvinylpyrrolidone aqueous solution into the reaction system obtained in the step S1, and continuing to carry out stabilizing reaction under the protection of inert gas, so that polyvinylpyrrolidone is modified on the surfaces of the generated selenium nanoparticles; s3, purification and collection: purifying the reaction liquid obtained in the step S2, removing small molecular impurities, and then freeze-drying to obtain selenium nanoparticle solid powder based on polyvinylpyrrolidone modification. The preparation method of the selenium nanoparticles based on polyvinylpyrrolidone modification, provided by the invention, has the advantages of safer raw materials, simpler process, purer product and the like.

The application discloses a method for preparing a disulfide at low temperature, which comprises the following steps: coupling reaction of m-dihalobenzene and a mercapto compound in the presence of sodium hydride and lithium iodide to prepare the disulfide. At present, the existing methods for synthesizing a disulfide have some problems to a greater or lesser extent. Either noble metal catalysis is needed, the cost is high, and there is a risk of heavy metal residue in the product; or the reaction operation is complex and complicated, and the reaction condition is harsh. The application develops a new method, which can start from cheap and readily available raw materials, use cheap initiators, and simply and effectively synthesize a disulfide under mild reaction conditions, so as to meet the needs of research and development and actual production.

The application discloses a kind of complex antimony-containing material high-efficiency antimony leaching method, solve the problem of low efficiency of antimony leaching and difficult solid-liquid separation when using conventional sodium sulfide alkali method to leach antimony.By alkali leaching and arsenic removal, copper and bismuth removal by chlorine salt reduction and acid leaching, and NaHS+NaOH combined antimony leaching after treatment, high-efficiency leaching and enrichment of antimony in complex antimony-containing material is realized.Compared with the leaching effect of sodium sulfide, the leaching efficiency of antimony is significantly improved, and the leaching rate of antimony in the process of NaHS+NaOH combined antimony leaching is stable at more than 96%.Compared with sodium sulfide, sodium hydrosulfide has the advantages of low price, low sodium content, low temperature and difficult crystallization, etc., so using sodium hydrosulfide instead of sodium sulfide to leach antimony can effectively reduce production cost, reduce sodium content in high-salinity wastewater from the source, and avoid the disadvantages of using liquid sodium sulfide storage tank, conveying pipeline, etc.

The application provides a synthesis method of active piperidone alkaloid, and the active piperidone alkaloid is Dysidone A. The raw material piperidine is used as a substrate, and the substrate is reacted with p-methoxy benzyl chloride under the condition of N,N-diisopropylethylamine, so that the secondary amine is protected, and the side reaction of sodium hydride and hydrogen on the secondary amine is avoided. Then, the secondary amine is oxidized under the condition of iodine and iodobenzenediacetic acid. Next, the secondary amine is reacted with triethyl phosphine acetic acid ester to obtain an alpha, beta unsaturated ester. Then, the p-methoxy benzyl protection is removed by using ammonium cerium nitrate in a mild and efficient manner. Finally, the ester is reduced into an alcohol by using diisobutylaluminum hydride. The piperidone alkaloid or the like is obtained through five reaction steps. The synthesis process is simple, the raw material is cheap and easy to obtain, the cost is low, the reaction condition is relatively mild, the purity is high, and the method has good economic and social benefits.

The present application relates to the technical field of catalytic materials, and discloses a halloysite nanotube loaded palladium-platinum bimetallic alloy catalyst and a preparation method thereof, the catalyst comprising heat pretreated halloysite and uniformly dispersed palladium-platinum bimetallic alloy particles, and the mass ratio of palladium, platinum and heat pretreated halloysite being 0.012-0.022:0.012-0.022:1. The preparation method comprises mixing the heat pretreated halloysite with palladium chloride and chloroplatinic acid hexahydrate, adding concentrated ammonia water to adjust the pH to 9-11 to form an ammonia complex; obtaining a precursor through a hydrothermal reaction, and adding sodium borohydride for liquid phase reduction. The bimetallic alloy phase produces geometric and electronic synergistic effects, thereby reducing the reaction activation energy; the ammonia complex ion is chemically bonded with the hydroxyl group of the carrier to prevent the loss of active components in the hydrothermal environment. The catalyst is combined with glycerol to produce hydrogen in situ, thereby avoiding the safety hazards and equipment investment of external high-pressure hydrogenation, and realizing the high-yield conversion of green diesel under extremely low noble metal loading.

The invention relates to a polycarboxylic acid water reducer and a preparation method thereof, and belongs to the technical field of polycarboxylic acid water reducers. The polycarboxylic acid water reducer comprises the following components: isopentenyl polyoxyethylene ether, acrylic acid, an acrylate monomer, modified talcum powder, sodium lignin sulfonate, sodium gluconate, ethylene glycol monovinyl polyethylene glycol ether, ammonium persulfate, methyl ethyl ketone peroxide, sodium hydrosulfide, a chain transfer agent and deionized water. The prepared water reducing agent has excellent fluidity, dispersibility and mechanical strength after being added into concrete.