48 results about "Sodium hydride" patented technology

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.

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 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 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 utility model relates to a kind of multi-stirring efficient vulcanization reaction kettle, including tank body, mixer and gas pipe, the liquid outlet of the mixer is connected with the side of tank body intercommunication;The side of tank body away from mixer is equipped with liquid outlet;Tank body bottom is equipped with slag outlet;Slag outlet is equipped with slag valve;The gas pipe is set in tank body top, and one end of gas pipe is inserted into tank body, and the other end is connected with gas conveying device.The utility model can mix waste acid and vulcanizing agent fully by mixer;And hydrogen sulfide gas is delivered to tank waste acid by gas pipe, so that hydrogen sulfide gas and waste acid react, conveniently recycle hydrogen sulfide gas, reduce the consumption of sodium hydrosulfide and sodium hydroxide, reduce processing cost.

The application discloses an electrocatalytic composite material of MXene loaded with copper phosphide nanoparticles as well as a preparation method and application thereof, and comprises the following steps: (1) dispersing MXene, a copper precursor, a phosphorus precursor and anhydrous sodium citrate in deionized water, continuously stirring until completely dissolved, adjusting pH by sodium hydroxide, and preparing a mixed solution; (2) under the environment of inhaled inert gas, adding sodium borohydride solution drop by drop into the mixed solution, and stirring intensively; when the reduction reaction is completed, centrifuging, washing and freeze-drying the obtained solid-liquid mixture, and finally obtaining P-Cu@MX composite material. The composite material is used as an electrocatalyst, is coated on the surface of a conductive material, forms a high-efficiency catalytic electrode, and constructs a reactor, so that the co-reduction of NO3 ‑ and CO2 into urea can be realized.

The application discloses submicron silver powder and a preparation method and application thereof, and belongs to the technical field of metal conductive powder.The preparation raw material of the submicron silver powder comprises an oxidizing agent, a reducing agent, a dispersing agent, a coating and settling agent and a twin crystal inhibitor; the oxidizing agent comprises at least one of silver nitrate, silver nitrite, silver carbonate and silver oxalate; the reducing agent comprises at least one of ascorbic acid, glucose, sodium borohydride, hydrazine hydrate and formaldehyde; the coating and settling agent comprises at least one of lauric acid, myristic acid, palmitic acid and stearic acid; and the twin crystal inhibitor comprises at least one of N,N-dimethylformamide, dimethyl sulfoxide, acetonitrile, hexamethylphosphorus triamide and dimethylacetamide; while effectively improving the dispersibility of the submicron silver powder, the twin crystal inhibitor restrains the growth of the eutectic face of the silver powder crystal, reduces the amount of the organic dispersing agent and improves the use performance of the silver powder at the slurry end.

A method for preparing bimodal nanocapsules includes: preparing a solution of mesoporous silica and deionized water, adding chloroauric acid solution and stirring, then adding sodium borohydride solution under ice bath stirring conditions to obtain gold nanoparticle-modified mesoporous silica; preparing a solvent of ultrapure water and gold nanoparticle-modified mesoporous silica, then sequentially adding a fluorescence quencher, a fluorescent molecule, and 4-mercaptophenylboronic acid to react separately to obtain bimolecularly modified nanoprobes; and mixing an adenosine-5′-triphosphate nucleic acid aptamer solution with the nanoprobes using ultrapure water as a solvent to obtain nucleic acid aptamer-encapsulated bimodal nanocapsules. This invention provides a simple, mild, environmentally friendly, and low-cost preparation method. The bimodal nanocapsules prepared by this invention can simultaneously monitor the levels of hydrogen peroxide and adenosine-5′-triphosphate (ATP) in cells using fluorescence and surface-enhanced Raman scattering (SERS) techniques, which can be used for early disease monitoring.

This invention relates to the field of trace gas leak detection, specifically to a highly sensitive and fast-response hydrogen sensor based on palladium single-atom doping, its preparation method, and its application. The method includes the following steps: preparing indium hydroxide material using indium ions, anhydrous ethanol, ammonia, and deionized water; then doping palladium ions into the indium hydroxide solution to obtain a palladium ion-doped indium hydroxide solution; reducing the solution with sodium borohydride; centrifuging to obtain palladium cluster-doped indium hydroxide material; subsequently calcining the palladium cluster-doped indium hydroxide composite material at high temperature to obtain a palladium single-atom-doped indium oxide composite material; and finally transferring the palladium single-atom-doped indium oxide onto an electrode substrate surface to obtain the hydrogen sensor. This invention, through improvements to key processes, effectively solves the problems of poor selectivity in pure indium oxide gas sensors and slow response speed in palladium nanoparticle-doped hydrogen sensors, achieving rapid and highly sensitive trace detection of hydrogen.

The application provides a low-smoke halogen-free cable sheath material and a preparation method thereof, and belongs to the technical field of high polymer materials. The terminal aluminum-based polyethylene is prepared through coordination chain transfer polymerization, is converted into terminal hydroxyl polyethylene through oxidation hydrolysis, is reacted with sodium hydride to obtain active polyethylene glycol sodium, alkyl sulfonate is used to initiate N -vinyl pyrrolidone cationic addition polymerization to prepare active polyvinyl pyrrolidone cation, and the two are connected through nucleophilic-electrophilic coupling reaction to form an ether bond connected PE-b-PVP block copolymer, and are used as an anchor agent to be blended and melt-extruded with polyolefin resin and phosphazene flame retardant, dipole-dipole interaction between the PVP segment and the phosphazene is utilized to realize in-situ physical enrichment of the flame retardant in the cable sheath. The sheath material has the characteristics of efficient flame retardation, excellent insulation, low smoke density and the like, and can be applied to the fields of medium and high voltage power cables, communication cables, special cables for rail transit and the like.

This invention belongs to the field of germane preparation technology, and provides a method and system for continuous production of germane. The invention involves mixing an alkali metal hydroxide, germanium dioxide, sodium borohydride, and water to form an alkaline feed solution. This alkaline feed solution is then added to a sulfuric acid solution, and the reaction is carried out under a protective atmosphere to obtain germane. The addition rate of the alkaline feed solution is 0.8~3.5 kg / h. This invention precisely controls the feed rate of the alkaline feed solution at 0.8~3.5 kg / h, thereby accurately controlling the reaction process, effectively removing the heat of reaction, successfully suppressing the rapid increase in temperature and pressure within the reaction system, and significantly reducing the occurrence of competing side reactions such as sodium borohydride hydrolysis. This improves the yield of germane synthesis while ensuring a smooth, efficient, and stable production process. This invention is a continuous process; for example, one batch can be produced in 12 hours, and two batches in 16 hours, greatly improving the synthesis efficiency of germane and making it suitable for industrial continuous production.

This invention proposes a boron-phosphorus co-doped multi-element alloy catalyst supported on a metal oxide substrate, its preparation method, and its application. It belongs to the technical field of sodium borohydride hydrolysis hydrogen production materials. The method involves loading cobalt salts (such as cobalt chloride or cobalt nitrate), iron salts (such as ferric chloride or ferric nitrate), and hypophosphite (such as sodium hypophosphite) onto a support (such as γ-alumina or titanium dioxide) using an initial wet impregnation method. Sodium borohydride solution is added for chemical reduction, and boron is added for doping. After washing the reduction product, the catalyst is dried to obtain the supported boron-phosphorus co-doped multi-element alloy catalyst. When used as a sodium borohydride hydrolysis hydrogen production catalyst, it provides a maximum hydrogen production rate of 12729.78 mL·g under optimal conditions. cat ‑1 ·min ‑1 It produces 100% of the theoretical hydrogen yield and features good catalytic performance, simple preparation method, abundant raw materials, and low cost.

The application relates to a preparation method and application of a 2-acyl benzothiazole compound, which comprises the following steps: placing sulfur ylide in a sealed tube, adding a solvent to dissolve, and obtaining a first reaction system; adding nitrosobenzene into the first reaction system, stirring at a certain temperature for a certain time, and obtaining a second reaction system; adding sodium hydrosulfide, dimethyl sulfoxide, a metal salt, potassium persulfate and an alkali into the second reaction system, heating and stirring in the sealed tube to react, and obtaining a third reaction system; and carrying out post-treatment on the third reaction system to obtain the 2-acyl benzothiazole compound.The application has the advantages that the reaction condition is mild, the price of the sodium hydrosulfide sulfur source is low, and the reaction yield is high; the substrate applicability range is wide, various substrate structures can tolerate the reaction condition, and the 2-acyl benzothiazole derivative with diversified structures can be rapidly prepared.

The application relates to a preparation method of an entropy-based oxide catalyst with high metallic property and application of the entropy-based oxide catalyst in hydrogen production by acidic electrolytic water, and belongs to the field of catalysis. A water-soluble salt containing at least Ru, Ir and A is uniformly mixed, hydrolyzed and reduced under water bath stirring condition by taking zinc oxide as a carrier and a sodium borohydride solution as a reducing agent, then the black powder of the medium-entropy alloy is formed through filtration, washing and drying, and finally the black powder is subjected to rapid incomplete oxidation under the condition of 300-500 DEG C and air atmosphere, and then is subjected to acid pickling, filtration, washing and drying to prepare the entropy-based oxide catalyst with high metallic property. The catalyst contains a large amount of Ir-Ir metal bonds and / or Ir-Ru metal bonds, and the proportion can reach 30%-40%. The mismatch between the metal atom fingerprint structure and the metal-oxygen atom coordination structure causes serious lattice distortion, induces unbalanced distribution of stress and strain, and promotes the kinetics of the acidic oxygen evolution reaction.

The application discloses a method for catalyzing sodium borohydride to produce hydrogen at low temperature, which is characterized by using natural flavonoids (including flavone, flavonol, isoflavone and the like) as a catalyst, using methanol or a mixture of methanol and water as a reaction solvent, using NaBH4 as a raw material for hydrogen production, and performing alcoholysis of NaBH4 to produce hydrogen. The catalyst used in the application is abundant in source and low in price, can catalyze sodium borohydride to produce hydrogen through alcoholysis at a wide reaction temperature range, has stable catalytic performance, high hydrogen production rate, good catalytic durability and reusability, and has important significance for the application and popularization of sodium borohydride in the field of hydrogen production.

This invention belongs to the field of fine chemical technology, specifically relating to a method for preparing sodium hydrosulfide using acidic gas. The invention constructs a multi-stage co-current absorption system with progressively decreasing total alkalinity concentration. The product outlet is located at the stage with the lowest total alkalinity, utilizing a low-alkalinity medium to suppress CO2 absorption, reducing the generation of sodium carbonate impurities by more than 67% at the source. Combined with room-temperature chemical precipitation for decarbonization and staged cooling crystallization for impurity removal, the system systematically solves the problem of difficult removal of soluble impurity salts such as CO2, NH3, and sodium thiosulfate. This invention uses industrial sulfur-containing tail gas as raw material, fully utilizing the exothermic reaction between H2S and NaOH to maintain the absorption temperature. Vacuum evaporation utilizes the residual heat from condensation for staged replenishment, achieving efficient sulfur resource recovery and green production. The process is simple, the equipment is mature, and the production line can switch between producing 43% liquid sodium hydrosulfide or over 70% solid sodium hydrosulfide, flexibly adapting to tail gas with different H2S concentrations.

The application discloses an adsorbing material for efficiently removing mercury and a preparation method thereof. The preparation method comprises the following steps: cutting cellulose, and washing the cellulose in anhydrous ethanol by ultrasonic to remove impurities, and obtaining defatted cellulose after vacuum drying; adding the defatted cellulose into an organic solution containing bromoacetyl bromide, stirring and reacting at 25-60 DEG C for 24-72 h, then filtering, washing with anhydrous ethanol, and drying to obtain brominated cellulose; under the protection of nitrogen, adding the brominated cellulose and sodium hydrosulfide into anhydrous ethanol, stirring and reacting at 60-90 DEG C for 24-96 h, then filtering, washing with water or ethanol, and drying to obtain the adsorbing material. The application has low cost, can effectively improve the density and dispersity of mercapto functional groups in the adsorbing material, can efficiently and quickly remove mercury in various media, and the prepared adsorbing material has good stability and selectivity.

This invention relates to the field of energy conversion technology, and discloses a method for preparing a B-NiMo catalyst and its application in seawater hydrogen evolution. The method includes the following steps: S1, dissolving molybdenum salt and nickel salt separately in water to prepare solutions, then mixing them and carrying out a hydrothermal reaction; cooling and filtering the reaction solution after completion, and drying the filter residue to obtain the catalyst precursor; dispersing the precursor in water, adding sodium borohydride for reduction reaction, washing and drying after reaction to obtain the B-NiMo catalyst. This invention successfully synthesizes boron-doped nickel molybdate nanocomposite material (B-NiMo) by reducing nickel molybdate with sodium borohydride, and uses it as a highly efficient water-to-hydrogen catalyst. This B-NiMo exhibits excellent catalytic performance in seawater hydrogen evolution reaction using tetrahydroxydiboron (THDB) as a sacrificial agent.

The application belongs to the field of medicine and pesticide intermediate synthesis, and particularly relates to a synthesis method of 3-amino-2-pyridine carboxylic acid. The method comprises the following steps: S1, reacting diethyl malonate and sodium hydride to obtain a sodium salt, and then reacting the sodium salt with 2,6-dichloro-3-nitropyridine to obtain 2-(6-chloro-3-nitropyridine-2-yl) malonic acid 1,3-diethyl ester; S2, reacting 2-(6-chloro-3-nitropyridine-2-yl) malonic acid 1,3-diethyl ester in the presence of a solvent and an oxidizing agent to obtain 6-chloro-3-nitro-2-pyridine carboxylic acid; and S3, hydrogen reduction of 6-chloro-3-nitro-2-pyridine carboxylic acid to obtain 3-amino-2-pyridine carboxylic acid. The process route is simple, easy to control, the raw materials are widely available, the yield is high, the cost is low, and the method is suitable for large-scale production, and has a good application prospect in the pharmaceutical industry, synthetic chemistry and medicinal chemistry.

Method for obtaining 2,3-diphenyl-6-{[5-(trifluoromethyl)pyridine-2-yl]oxy}-6,7-dihydro-5H-imidase[2,1-b][1,3]thiazine involves the reaction of starting material, 6-hydroxy-2,3-diphenyl-6,7-dihydro-5H-imidase[2,1-b][1,3]thiazine, with halogen-substituted pyridine in dimethylformamide. Previously obtained solution of 2,3-diphenyl-6,7-dihydro-5H-imidazo[2,1-b] [1,3]thiazine-6-ol and NaH in dimethylformamide is stirred for 0.5 hours at room temperature; only then is 5-(trifluoromethyl)-2-chloropyridine added in a 1:1 ratio, and mixture is subjected to intensive stirring for 24 hours. Then reaction mixture is poured onto ice; resulting precipitate is filtered off and identified as 2,3-diphenyl-6- {[5-(trifluoromethyl)pyridin-2-yl]oxy}-6,7-dihydro-5H-imidazo[2,1-b][1,3]-thiazine. Thus, the synthesis is carried out by first preparing solution of starting compound with NaH using the method of prolonged stirring, followed by the main synthesis with a reaction time of 24 hours.

The present application relates to a kind of new method for the synthesis of metconazole, belong to the technical field of pesticide and chemical industry.The method includes the following steps: under the catalysis of strong base, 5-(4-chlorobenzyl)-2,2-dimethylcyclopentanone is reacted with sodium 1,2,4-triazole, sulfur ylide in a specific solvent to synthesize metconazole by one-pot method, and metconazole pure product is obtained by water washing, extraction, neutralization, decolorization and crystallization.The sulfur ylide is selected from methyl diethyl bromo (iodo) sulfoxide or methyl tetramethylene bromo (iodo) sulfoxide, which inhibits the generation of four-membered ring byproduct and improves the yield of metconazole.The strong base is selected from sodium (potassium) tert-butoxide, which replaces the extremely dangerous sodium hydride in the traditional method.The synthesis method described in the present application is simple and easy to operate, with high yield of metconazole, suitable for large-scale industrial production.

This invention relates to a method for preparing indene diazine compounds and oxadiazine insecticides, belonging to the field of pesticide technology. The structure of the indene diazine compound is shown in Formula II: where R is methyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, phenyl, or a substituted phenyl group. The indene diazine compound shown in Formula II is used to prepare the oxadiazine insecticide shown in Formula I. This invention avoids the use of high-risk materials such as phosgene, triphosgene, and sodium hydride. After multiple batch verifications, the overall reaction yield is stable and suitable for industrial production.

The application discloses a palladium-loaded vanadium oxide doped nitrogen-carbon material and a preparation method and application thereof, and the preparation method is as follows: S1, zinc salt and vanadium salt are dissolved in a composite solvent according to a mass ratio of 95:3-7, then 1H-1,2,3-triazole is added to form a suspension A, the obtained suspension A is continuously stirred and reacted, then is centrifuged, washed and dried to obtain a Zn / V-MET-6 product; S2, the Zn / V-MET-6 is calcined in a tube furnace at 850 DEG C-1000 DEG C for 1h-4h, and then is cooled to room temperature to obtain vanadium oxide doped nitrogen-carbon; S3, the vanadium oxide doped nitrogen-carbon is uniformly stirred and mixed with water and sodium tetrachloropalladate, then a sodium borohydride reducing agent is added, after a reduction reaction, a suspension B is obtained; the obtained suspension B is centrifuged, washed and dried to obtain the palladium-loaded vanadium oxide doped nitrogen-carbon material; the catalyst loads Pd nanoparticles in a carrier, and after reduction, a porous composite material is obtained, the catalyst has good stability and excellent performance in catalyzing decomposition of formic acid.

The application discloses a kind of molybdenum bis (dibutyl dithiocarbamate) oxide and preparation method thereof, comprising the following steps: molybdenum trioxide, phase transfer catalyst and water are uniformly mixed, are sent into first-stage mixing reactor, sodium hydrosulfide, sodium thiosulfate and water are uniformly mixed, also are sent into first-stage mixing reactor, and first reaction solution is obtained by reaction;Di-n-butylamine and water are uniformly mixed, are sent into second-stage mixing reactor, carbon disulfide is simultaneously sent, and second reaction solution is obtained by reaction;First reaction solution, second reaction solution are respectively sent into third-stage mixing reactor and are reacted, obtain molybdenum bis (dibutyl dithiocarbamate) oxide solution, solid-liquid separation, drying, obtained immediately.The yield of product obtained by the application is high, the purity is high, the quality is stable, the whole reaction process is continuously carried out in airtight container, there is no gas volatilization, which is conducive to environmental protection, reaction solvent is water, resource consumption is less, can be recycled, clean and environmentally friendly.

This invention relates to the field of heterogeneous catalysts, specifically to a method for preparing and applying an iron-cobalt-based silica hydrogenation catalyst. The invention provides a method for preparing an iron-cobalt-based silica catalyst, comprising the following steps: preparing a kcc-1 precursor by heating a mixture of CTAB with urea, tetraethyl orthosilicate with n-butanol, and cyclohexane. Cobalt nitrate and ferric chloride are dissolved in water, thoroughly mixed with a support, and then sodium borohydride is added and reacted in a reactor. After separation, washing, and drying, the catalyst is obtained, which can be used for the reduction reaction of nitrobenzene. The catalyst of this invention has the characteristics of high metal loading, high catalytic efficiency, and a simple preparation method, convenient operation, mild reaction conditions, and no highly hazardous compounds involved in the reaction. It avoids high-temperature reactions, reducing costs and environmental impact in industrial applications.

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

The application belongs to the technical field of composite materials, and discloses a preparation method of nickel-coated graphene and application of the nickel-coated graphene in aluminum-based composite materials. The preparation method comprises the following steps: obtaining graphene nanosheets by pretreating natural graphite; forming a nickel catalytic seed layer through stannous chloride sensitization and sodium borohydride activation; and performing chemical plating in a plating solution containing nickel sulfate hexahydrate, sodium citrate, ammonium chloride and sodium hypophosphite monohydrate to obtain nickel-coated graphene with a 3-10 nm continuous nickel shell layer on the surface. The nickel-coated graphene is mixed with aluminum-silicon-magnesium alloy powder and ball milled, and then subjected to low-temperature reaction at 350-450 DEG C to generate Al3Ni phase, high-temperature hot pressing densification at 600-650 DEG C to obtain aluminum-based composite materials. The method can effectively control Al-C interface reaction, inhibit the generation of Al4C3, improve the mechanical properties and electrical conductivity of the composite materials, and is suitable for large-scale application.

The application discloses a method for detecting perchlorate based on a silver nanofilm substrate. The application uses polydiene dimethyl ammonium chloride and sodium diethylthio carbamate as a protective agent, polyvinyl pyrrolidone as a stabilizer, and sodium borohydride-ethylene glycol as a reducing agent to obtain polydiene dimethyl ammonium chloride or diethylthio amino modified silver nanoparticles with high activity through one-pot synthesis or microwave synthesis, which are used as a surface-enhanced Raman scattering substrate for the detection of perchlorate. The perchlorate detection technology provided by the application has the advantages of simple preparation process, green and environmentally-friendly synthesis process, high sensitivity and the like, and provides a new technical path for the accurate detection of perchlorate in water.