327results about How to "Lower the activation energy of the reaction" patented technology

The invention discloses a method for preparing 5-hydroxymethylfurfural by solid acid catalysis. The method comprises the following steps of taking lignin residue hydrolyzed by biomass as carrier raw material of solid acid; synthesizing the raw material into solid acid through a two-step way of carbonization and sulfonation, so that the waste material is recycled and the problem of disposal of pollutants is solved. In the dehydration reaction of lignin-based solid acid catalyzed fructose and glucose, the yield of 5-hydroxymethylfurfural can be respectively 84% and 68%; after the dehydration reaction, the lignin-based solid acid is easy to separate and reusable, the acid density of the solid acid can be reduced after being reused five times, and the yield of the 5-hydroxymethylfurfural is still higher than 75%. The method provided by the invention can be used for realizing emission without pollution, and is helpful for realizing environment-friendly producing process of 5-hydroxymethylfurfural.

The invention relates to a preparation method of repairing adhesive, in particular to a binder for repairing blade of a wind driven generator, belonging to the high polymer material field. The preparation method of double-component epoxy resin binder used for repairing blade is simple in operation and low in cost. The double-component epoxy resin binder for repairing blade which is made by the method of the invention has high tenacity, high shear strength, low heat and low shrink, thus being suitable for repairing and binding of large structural part; solidification is rapid, the binder can be rapidly solidified in 10-30 minutes at 5-25 DEG C and reach certain strength; and the binder is used for repairing defect of blade of wind driven generator.

The invention provides an application method of cold field plasma discharge assisted high energy ball milled powder and a plasma assisted high energy ball milling device using the cold field plasma discharge assisted high energy ball milling method. The method comprises the following steps: utilizing dielectric barrier discharge to generate plasmas, introducing a dielectric barrier discharge electrode bar into a high-speed vibrating ball-milling tank, on one hand, requiring a solid insulating medium on the outer layer of the electrode bar to simultaneously bear high-voltage discharge and mechanical shock failure of the grinding ball, and on the other hand, requiring the high-speed vibrating ball milling device to uniformly process the powder. The method is based on the ordinary ball milling technology; the processing efficiency and the effect of the ball mill can be greatly improved by the following steps: under a non-heat-balance discharge condition of the pressure that the discharge space pressure is set to be about 102-106 Pa, introducing the discharge plasmas to input another effective energy to the processed powder, promoting the powder to be processed to be subjected to combined action of the mechanical stress effect and the heat effect of the external electric field, and further accelerating refining of the powder and promoting the alloying progress.

The invention provides a multi-doping spherical ferric phosphate lithium anode material and manufacture method thereof, the chemical formula of the anode material is Li1.03-xMgx / 2Fe1-yTiy / 2PO4-z / 2Fz / C, wherein 0<x<=0.1; 0<y<=0.1; 0 <z<=0.1. The anode material according to the invention comprises high unit capacity (>160mAh / g) and compaction proportion (1.45 to 1.75g / cm3), which efficiently enhance conduction ability thereof with excellent unit capacity. The raw material of the anode material according to the invention uses villaumite to reduce reaction activation energy, increase liquidoid during reaction process in order to control product particle feature to obtain spherical particle and enhance compaction proportion, being beneficial to improve manufacture process of electrode paste, simplify preparation and coating of battery paste and process the plate electrode; by being doped with magnesium, titanium and fluorine in the material structure to form semiconductors, the conduction ability of the material can be improved. The invention has simply process, low costs, being convenient to realize industrial manufacture.

A process for synthesizing silicon nitride powder by atmospheric pressure combustion includes such steps as proportionally mixing Si powder with catalyst, adding silicon nitride for activating and combustion reaction. Its main product is Si3N4.

The invention discloses a method for preparing ovalbumin with high foamability by microwave ultrasonic waves. The method comprises the following steps of accurately weighing 50g of ovalbumin and 50g of glucose respectively, dissolving into a 500mL of 2mmol / L NaCl solution, stirring slowly at room temperature for 20 minutes until dissolving completely, mixing uniformly, adjusting the pH to 8.0, putting into a 800mL high-pressure seal tank, and modifying the ovalbumin by controlling the microwave and ultrasonic wave time as well as power so as to improve the foamability. The ovalbumin prepared by the method is high in foamability which is 6-8 times of that of the untreated protein, is simple to operate, is low in cost, is reasonable in technology, and is short in production cycle.

The invention provides propenyl phenoxy compounds with a three-branch aromatic structure and a preparation method thereof, and a bismaleimide resin modified by the propenyl phenoxy compounds, relating to the field of thermosetting resins and adhesives for high-temperature-resistant composite materials. The invention aims to solve the problems of higher curing temperature and higher after-treatment temperature in the existing bismaleimide resin and the problem of poor long-time thermal aging resistance of the cured resin at high temperature. The structural general formula is disclosed in the specification. The preparation method comprises the following steps: adding trifunctional fluoro ketone, allyl phenol and a catalyst into a solvent, heating to react under reflux, filtering, cooling, precipitating, washing with water and baking. The bismaleimide resin modified by the propenyl phenoxy compounds is prepared from bismaleimide, propenyl phenoxy compounds with three-branch aromatic structure, and diallylphenyl compounds. The invention mainly discloses a propenyl phenoxy compounds with three-branch aromatic structure and a preparation method thereof, and a bismaleimide resin modified by the propenyl phenoxy compounds.

The invention discloses a preparation method of a polycarboxylate superplasticizer with a high water reducing rate. The polycarboxylate superplasticizer is prepared through adopting the preparation method comprising the following steps: according to parts by mass, with an unsaturated polyether macromonomer and an unsaturated sulfonic acid micromonomer as dropwise adding components 1, an azo initiator, a peroxide initiator and an initiation accelerant as dropwise adding component 2, acrylic acid as a dropwise adding component 3 and a molecular weight modifier as a dropwise adding component 4, feeding the unsaturated polyether macromonomer and the unsaturated sulfonic acid micromonomer as well as deionized water into a reactor, stirring and increasing the temperature; when the temperature rises to a dropwise adding temperature, orderly dropwise adding the dropwise adding components 1-4 to the reactor at a constant speed for 3-5 hours; after the dropwise adding is finished, preserving heat for 0.5 hour to 1.5 hours to obtain a copolymerization product; and after the reaction is finished, adding an aqueous solution of sodium hydroxide for neutralization to obtain the polycarboxylate superplasticizer having the pH value in the range from 6 to 7. The preparation method disclosed by the invention is simple in reaction process, easy to control the reaction and low in production cost; the product obtained through the reaction is high in water-reducing rate and good in slump loss resistant and slow-release properties.

The invention discloses a method for collecting platinum group metal through microwave heating fusion. The method comprises the following steps that firstly, the temperature of a mixture containing aplatinum group metal raw material, a collector and additives is raised to 1,050 DEG C-1,200 DEG C under microwaves, the mixture is fused, and after fusing is completed, slag-liquid separation is carried out, and a slag phase and metal matte are obtained; wherein the collector comprises Ni3S2, and the additives are at least one of borax, sodium carbonate, sodium bicarbonate, sodium hydroxide, sodium peroxide and methylcellulose; and secondly, the metal matte is cooled and subjected to acid leaching treatment, and pickle liquor and platinum-containing leaching slag are obtained. According to themethod, efficient recovering of the platinum group metal in a waste catalyst containing the platinum group metal can be achieved at the relatively low fusing temperature, the content of the platinumgroup metal in the slag can be reduced through slag flotation, the collector is recovered in lixivium, and resources are saved.

The invention discloses a preparation method of tin-based silver graphene lead-free composite solder. The method comprises the steps that a certain amount of graphene and lauryl sodium sulfate are mixed, then a certain amount of dimethylformamide is added, ultrasonic treatment is performed for 2 h, a certain amount of silver nitrate is added into a mixed solution, ultrasonic treatment is performed continuously, and finally a self-made silver graphene nanosheets are obtained; and required solder matrix powder is weighed according to different graphene mass fractions and poured into a ball milling tank for ball milling for 5 h, the powder is placed into a stainless steel mold after being dried and placed under a hydraulic machine to be pressed and molded at the pressure of 500 Mpa, and then a cylinder obtained through cold pressing is placed into a high-vacuum tubular resistance furnace for vacuum sintering for 2 h at the temperature of 175 DEG C and placed under the hydraulic machine after being cooled to the room temperature to obtain a cylinder through impact extrusion. According to the preparation method, Ag-particle-modified graphene is selected as a strengthening material so as to improve load transmitting between the nano-silver-modified graphene and a Sn matrix, and therefore the better strengthening effect is achieved.

The invention discloses a preparation method of an Ni1-xFexOOH-modified titanium dioxide photoelectrode. The preparation method comprises the following steps that a titanium source compound is added to hydrochloric acid and stirred, then conductive glass is inserted into the mixture, a hydrothermal reaction is generated, TiO2 grows to the surface of the conductive glass, the conductive glass is taken out, washing, drying and calcining are conducted, and the TiO2 photocathode is obtained; and then the TiO2 photocathode is used as a working electrode, an aqueous solution containing ferric chloride, nickel chloride, sodium fluoride, potassium chloride and hydrogen peroxide is used as electrolyte, Ni1-xFexOOH is modified on the working electrolyte through cyclic voltammetry, washing and drying are conducted, and the Ni1-xFexOOH-modified titanium dioxide photoelectrode is obtained. The prepared photoelectrode is used for hydrogen production through photoelectrocatalysis and water of decomposition, carrier recombination of the TiO2 photoelectrode can be inhibited effectively, besides the reaction activation energy is facilitated, and a surface oxygen evolution reaction of the photoelectrode is promoted.

The invention discloses pillared hydrotalcite and a preparation method thereof, relates to hydrotalcite and a preparation method thereof, and solves the problems of easy agglomeration and long preparation time of the conventional pillared hydrotalcite. The structural formula of the pillared hydrotalcite is [M2+1-xM3+x(OH)2]x+[An-]x / n.zH2O, wherein M2+ and M3+ are laminar main body ions, An- is an interlayer ion, x is more than or equal to 0.20 and less than or equal to 0.34, and z is the number of crystal water. The method comprises the following steps of: dripping aqueous solution of mixed salt containing M2+ and M3+ and aqueous solution of alkali sodium carbonate into the stirring water, and obtaining a bimetallic composite oxide by microwave crystallization and sintering; and preparing reduction solution from the bimetallic composite oxide, sodium hydroxide and soluble salt of the interlayer ion An-, and performing microwave crystallization and sintering on the reduction solution to obtain the pillared hydrotalcite. The pillared hydrotalcite of the invention is difficult to agglomerate, the exchange time of the interlayer negative ions is only 10 to 20 minutes, and the pillared hydrotalcite can be used in the macromolecular flame-retardant field.

The invention provides a method for preparing a photoinduced ultra hydrophilic automatically cleaning paint, comprising the following steps: (1) preparing titanium dioxide suspension by using titanium hydroxide; (2) preparing cerium-doped anatase titanium dioxide for subsequent use; (3) placing waterless ethanol, ammoniacal liquor, distilled water and ethyl orthosilicate which is added later into a reactor and magnetic stirring uniformly; (4) magnetic stirring the mixed liquor prepared in step (3) for more than 3 h in a constant temperature bath of 80 DEG C to obtain silica sol; (5)mixing the cerium-doped anatase titanium dioxide prepared in step (2), silica sol prepared in step (4) with waterless ethanol and stirring uniformly to obtain the photoinduced ultra hydrophilic automatically cleaning paint. The photoinduced ultra hydrophilic automatically cleaning paint has the advantages of simple use and convenient. The preparation method has the advantages of low energy consumption, saving heat treatment equipment, and low cost.

The invention provides a preparation method of active carbon. The preparation method comprises the following processes: a pre-oxidation process: performing pre-oxidation reaction on coal direct liquefaction asphalt to obtain pre-oxidized asphalt; a carbonization process: mixing the pre-oxidized asphalt with an activating agent, and performing carbonization reaction to obtain carbonized asphalt; and an activation process: performing heating activation on the carbonized asphalt to obtain active carbon. The coal direct liquefaction asphalt is subjected to pre-oxidation at first to ensure that small-molecular substances and macromolecular substances in the asphalt can be crosslinked with each other to form high-melting-point pre-oxidized asphalt, so that the coal direct liquefaction asphalt can be beneficially inhibited from melting in the carbonization process; and then, the pre-oxidized asphalt is subjected to the processes of carbonization and quick activation to prepare the active carbon with a relatively high specific surface area. The preparation method of the active carbon, provided by the invention, is more moderate in reaction condition and simpler in process flow.

The invention relates to a preparation method for anti-pilling, anti-ageing and normal-pressure cation dyeable polyester chips. The preparation method comprises procedures of primary esterification, transesterification, secondary esterification and polymerization, wherein three monomers are added in the transesterification procedure; a hindered amine light stabilizer, a hindered phenol antioxidant and hydroxyl silicon oil are added after the secondary esterification and before prepolymerization; and the polyester slices are precrystallized and dried before the spinning procedure. A fabric prepared from fibers spun by the polyester chips has a high anti-pilling property and high light fastness; the polyester fibers can be dyed with various bright colors due to the normal-pressure cation dyeable property; the unified requirement of high-grade spring and summer clothing at present on functionality and color is met; and the polyester fibers and wool can be dyed in the same bath and a good clothing effect of the fibers blended with the wool is achieved. The polyester fibers spun by the polyester chips are important supplement for the cation dyeable polyester fiber market at present and have wide market prospect.

The invention discloses a low-temperature plasma catalytic oxidation gas deodorization method. The method comprises the steps that exhaust gas enters the interior of a stainless steel reaction box from a gas inlet, and dust particles in the gas are intercepted through an activated carbon filter layer; then the gas enters a low-temperature plasma reaction chamber, after a power supply is switched on, multiple sets of reaction polar plates in the low-temperature plasma reaction chamber conduct high-voltage discharge to generate substances with a strong oxidizing property, macromolecules, producing malodor, in the gas are broken up into small molecules under the combined action of the substance with the strong oxidizing property and ultraviolet rays, and the small molecules are further oxidized to obtain inorganic molecules when the small molecules make contact with hydroxyl free radicals and oxygen atoms which are released by a catalytic oxidation reaction coating. According to the low-temperature plasma catalytic oxidation gas deodorization method, the low-temperature plasma technology is perfectly combined with the coating catalytic oxidation and ultraviolet oxidation technologies. According to the exhaust gas treated through the method, the removing rate of malodorous gas reaches over 98 percent, the removing rate of harmful microorganisms and bacteria reaches 98.9 percent, and the removing rate of the dust particles reaches 96.2%.

The invention relates to a method for preparing a high-comfortable composite functional polyester fiber, comprising the steps of: first esterification reaction section, secondary esterification reaction section, polymerization reaction process and spinning process, wherein aliphatic dicarboxylic acid and / or non-centrosymmetrically aromatic dicarboxylic acid is led into the first esterification reaction section to serve as a third monomer; flexible polyethylene glycol is led into the secondary esterification reaction section to serve as a fourth monomer; after finishing the esterification reactions, hindered amine light stabilizer and hindered phenolic antioxidant which are respectively prepared by taking acetic acid and ethylene glycol as solvents and hydroxyl silicone oil are added; after finishing pre-polymerization and before final polymerization of the polymerization reaction process, ultraviolet light absorber and antistatic agent are added; and before finishing the spinning process, polyester slices are performed pre-crystallization and drying; fibers with odd-shaped cross sections of three-leaf, cross, five-leaf and the like are prepared by melt spinning. The obtained polyester fiber is anti-ultraviolet light, antistatic, anti-pilling and has wet-absorbing quick-drying performance; and the fabric has high comfort.

The invention discloses a silicon nitride nano-wire enhanced porous silicon nitride composite material and a preparation method thereof. The preparation method includes the steps: (1) mixing polymer monomers, cross-linking agents, dispersing agents, pore-forming agents and deionized water, mixing silicon nitride ceramic powder, silicon monoxide, nano-wire catalysts, sintering additives and mixed solution, and then performing ball-milling in advance; (2) adjusting a pH (potential of hydrogen) value of obtained premixed slurry to 9.5-11.5, performing ball milling and vacuum degassing, and mixingthe slurry and initiating agents; (3) performing injection molding by the aid of obtained injection molding slurry, and performing demolding, drying and rubber discharging; (4) sintering silicon nitride ceramic blanks in a protective atmosphere to obtain the composite material. The method has the advantages that the positions and the quantity of the nano-wires can be controlled, complicated shapes and molding of large components can be adapted, devices are simple, a process is safe and controllable and the like. Correspondingly, the prepared composite material is high in fracture toughness.

The invention discloses a method for preparing solid calcium carbide. The method comprises steps as follows: (1) a carbon material and a calcium containing material are ground fine, so that carbon material powder and calcium containing material powder can be obtained respectively; (2) a mixture containing the carbon material powder, the calcium containing material powder and iron powder is mixed and wet-ground with a bonding agent, and a mixed material is obtained; (3) the mixed material is shaped to obtain a material pellet; (4) the material pellet is smelted at the temperature of 1,200-1,380 DEG C so as to obtain the solid calcium carbide. The solid calcium carbide can be effectively prepared with the method, and the production cost of the calcium carbide is obviously reduced.

The invention relates to a preparation method for polyester fibers with anti-static, anti-pilling and normal-pressure cationic dyeable compound functions. The preparation method comprises procedures of primary esterification, transesterification, secondary esterification and polymerization, wherein three monomers are added in the transesterification procedure; a hindered amine light stabilizer, a hindered phenol antioxidant and hydroxyl silicon oil are added after the secondary esterification and before prepolymerization; and an antistatic agent is added after the prepolymerization and before final polymerization. Fabric spun by the polyester fibers has high anti-static and anti-pilling properties; the polyester fibers can be dyed with various bright colors due to the normal-pressure cation dyeable property; the unified requirement of high-grade spring and summer clothing at present on functionality and color is met; and the fibers and wool can be dyed in the same bath and a good clothing effect of the fibers blended with the wool is achieved. The polyester fibers are important supplement for the cation dyeable polyester fiber market at present and have wide market prospect.

The invention provides a water-soluble fast reaction kinetics couple-based photoelectrochemical energy storage battery. When the battery is charged, in-situ transformation of light energy into chemical energy is achieved by using photoelectrochemical reaction driven by self-bias of narrow band gap photoelectrodes and the chemical energy is stored into an active material of a battery electrolyte; and when the battery is discharged, electrochemical reaction is carried out, thereby achieving transformation of the chemical energy into electric energy. The photoelectrochemical energy storage battery integrates a photoelectrochemical battery and a flow battery; the disadvantage that a solar cell cannot achieve electric energy storage is overcome; meanwhile, a single charging mode of the energy storage battery is also expanded; and solar energy in-situ transformation, storage and controllable utilization without assistance of external bias are achieved. Water-soluble fast reaction kinetics redox couples are adopted as the active material; the utilization rate of photo-induced carriers on the surfaces of photoelectrodes is close to 100%; meanwhile, the discharge power density of the battery can reach 0.5W / cm<2>; large-scale amplification can be achieved; and the photoelectrochemical energy storage battery is suitable for different scales of solar energy-energy storage-power generation processes.

The invention relates to a preparation method for a polyester fiber with a composite ultraviolet, static electricity and pilling resisting function. The preparation method comprises an esterification reaction procedure, a polymerization reaction procedure and a spinning procedure. The esterification reaction procedure comprises a primary esterification reaction stage and a secondary esterification reaction stage, flexible polyethylene glycol is introduced as a third monomer in the secondary esterification reaction stage, and after esterification is finished, a hindered amine light stabilizer,a hindered phenol anti-oxidant and hydroxyl silicone oil are added, wherein the hindered amine light stabilizer and the hindered phenol anti-oxidant are prepared by taking an acetic acid and ethyleneglycol as solvents. In the polymerization reaction procedure, after prepolymerization and before final polymerization, an ultraviolet absorbent and an antistatic agent are added. Before the spinning procedure, polyester is sliced for pre-crystallization and drying. The polyester fiber obtained by the method has the outstanding ultraviolet, static electricity and pilling resisting functions, and after being woven into knitted machine-made fabrics, is tested to have related technical indexes comprising the ultraviolet light transmittance of less than or equal to 5.0%, the pilling resistance of more than or equal to level 4 and the fiber volume specific resistance of less than or equal to 10*10<10> ohm.cm.

The invention provides a preparation method of a lithium iron phosphate battery material. The method comprises the steps that an iron source, a phosphate source and a molding agent are dissolved in deionized water after being mixed; a mixed solution is heated to 50-70 DEG C for stirring while heating, and H2O2 is added for complete oxidation; the oxidized solution is heated to 80-95 DEG C, and heat preservation is conducted for 1-10 h to obtain pink or white sediment; the pink or white sediment is subjected to pre-sintering, pre-sintering temperature is 450-650 DEG C, and pre-sintering time is1-8 h, so that a compound is obtained; the compound, a lithium source and a phosphate source supplement are mixed, a carbon source is added, and in a sand mill, wet grinding is conducted to obtain amaterial in required particle size; the material is subjected to sintering in an inert atmosphere or reductive atmosphere after being dried, sintering temperature is 700-850 DEG C, and sintering timeis 5-20 h, so that the high-compaction high-capacity LiFePO4 / C material is obtained.

The invention discloses a method for preparing an apocynum spinnable fiber, which comprises the following processes: activating treatment on an original apocynum skin, soda boiling, washing and dehydration drying. The activating treatment process of the original apocynum skin is as follows: at room temperature, dipping the original apocynum skin in water, adding a reducing agent to the water, raising the temperature to be between 65 and 75 DEG C, adding an oxidant to the mixture, keeping the temperature for at least 80 minutes, and cooling the mixture to the room temperature. Compared with the prior art, the fiber preparation process of the invention has the advantages of simplifying the technical process, greatly reducing the process time, lowering the temperature of a treatment fluid, achieving the aim of saving energy and reducing consumption, and improving the fiber forming rate for the preparation of the apocynum fiber, along with good spinning performance and good handfeel and glossiness.

The invention discloses a method for preparing 5-hydroxymethylfurfural from acidic iron liquids. The 5-hydroxymethylfurfural is prepared by catalyzing fructose by directly taking the acidic iron liquids, i.e., [BMim]TS and [BPy]TSO, as a solvent and a catalyst. When a reaction is carried out at the temperature of 80 DEG C and the speed of 150r / min for 30min, the conversion rate of the fructose can reach 100%, and the yield of the 5-hydroxymethylfurfural can reach 94.5%. The acidic iron liquids not only can dissolve the fructose and the 5-hydroxymethylfurfural under the action of static electricity, but also can generate hydrogen ions to be in bronsted acidity and can form a hydrogen bond with the fructose to activate a reaction bond, thereby lowering the reaction temperature and shortening the reaction time. The separation of the 5-hydroxymethylfurfural from an ionic liquid can be realized in a way of organic solvent extraction or distillation, the ionic liquid can be recovered, a volatile organic solvent is avoided being used in the reaction process and during later separation, and the pollution to the environment is reduced.

The invention belongs to the technical field of chemical and molecular structure information, and provides a complex system reaction access calculating system and an implementing method thereof. The calculating system comprises a molecular simulation and quantum chemistry calculating module, a molecular conformation searching module and a refined calculation and application module. A molecular structure simplified pattern reaction system is constructed, a characteristic reaction path is analyzed, and relevant key structures comprising ground states and transient states of reactions of a target reaction system are searched for. Based on a low-dimensional characteristic potential energy surface in a pattern system, a reaction network access is set up, and reaction coordinates of local minimum points and saddle points of a potential energy surface in a network are recorded; based on information of the reaction coordinates, molecule grafting restoring the pattern system (simple) to the target system (complex) is achieved. Through the molecular conformation searching technology, under the condition of characteristic coordinate restraint, a conformation set of reaction objects of the target system is searched for, and molecules in the conformation set are structurally optimized; effective ground state and transient state molecular structures of the reaction objects are collected according to the reaction characteristics of the characteristic coordinates on the reaction path.

The invention discloses an organic waste gas purifying device and method. The method comprises the steps that dust particles in waste gas are gathered and separated; high-energy electrons generated by discharge of flowing light and pollution gas molecules collide, and chemical bonds in the molecules are broken and activated; ultraviolet light radiates a nanometer titanium catalyst to generate multiple free radicals and electron holes, and organic waste gas is oxidized and decomposed. By the adoption of needle array positive direct current flowing light discharge, energy density of corona discharge is increased, and more high-energy electrons with high activity can be generated to carry out activating decomposition on the organic waste gas molecules. By means of the synergistic effect of precious metal and the manganese dioxide catalyst, the reaction path is changed, the reaction activation energy is reduced, organic waste gas is promoted to be thoroughly oxidized into dioxide carbon and water, and intermediate products are reduced. Nanometer titanium dioxide generates photos and the electron holes under radiation of ultraviolet light, and then particles with high oxidability of hydroxyl, oxygen free radicals and the like are formed, and subjected to the photochemical oxidation reaction with pollutants.

The invention relates to a bimetallic-activity monatomic catalyst for a metal-air battery and a preparation method thereof and the metal-air battery, and belongs to the technical field of metal-air batteries. The preparation method of the bimetallic-activity monatomic catalyst for the metal-air battery comprises the following steps: 1) adding a cobalt-nickel bimetallic organic framework compound and dopamine hydrochloride or dopamine into an alkaline solution, stirring for 5-8 hours, and carrying out solid-liquid separation to obtain an MOF / PDA nano cubic block, wherein the alkaline solution is a tris buffer solution; and 2) carrying out annealing processing on the MOF / PDA nano cubic block prepared in the step 1) in an ammonia atmosphere to obtain the required product. The metal-air battery prepared from the catalyst prepared by the preparation method of the bimetallic-activity monatomic catalyst for the metal-air battery has better charge-discharge efficiency and longer cycle life than similar batteries.

The invention relates to a method for synthesizing an aluminum-based composite material by multielement magnetic field combined fusant reaction, which belongs to the technical field of preparation of materials. In the method, the fusant reaction synthesizing process is divided into three phases of reactant dispersion, contact chemical reaction and reaction product dispersion and by-product separation according to the characteristic that the fusant synthesizing reaction is solid-liquid phase reaction; and a corresponding combined magnetic field is applied according to different characteristics of all phases to carry out control. A high-frequency magnetic field and a low-frequency traveling wave magnetic field are applied in the reactant dispersion phase to improve the dispersing effect and the dispersing rate of a reactant; a pulse magnetic field and the low-frequency traveling wave magnetic field are applied in the contact reaction phase to accelerate the in-situ reaction course in a fusant; and the high-frequency magnetic field and the pulse magnetic field are applied in the reaction product dispersion and by-product discharge phase to control the clustering of particles and be beneficial to separating slag phases. The method can realize accurate control on the reaction synthesizing process of the fusant, improves the synthesizing efficiency and is beneficial to improving the quality of the composite material fusant.

The invention discloses nanocrystalline high-entropy alloy powder and a preparation method thereof, and relates to the technical field of powder metallurgy. The invention involves the nanocrystallinehigh-entropy alloy powder and the preparation method of the nanocrystalline high-entropy alloy powder, wherein the nanocrystalline high-entropy alloy powder comprises cobalt powder, chromium powder, iron powder, nickel powder, manganese powder, aluminum powder and titanium powder; and the metal element powder is directly mixed through a high-energy mechanical ball milling method by the preparationmethod of the nanocrystalline high-entropy alloy powder, and the nanocrystalline high-entropy alloy powder is prepared according to the specific steps. According to the nanocrystalline high-entropy alloy powder and the preparation method, through high-speed impact and grinding of grinding medium, reaction activation energy is reduced, powder activity is improved, solid diffusion among element powder is promoted, low-temperature chemical reaction is induced, and finally, the alloy powder with uniform composition and structure distribution is obtained, so that the problems of element volatilization and non-uniform components of the powdering after smelting is conducted are solved. The technical is simple in equipment, the procedure is simplified compared with a traditional method, the manufacturing cost is reduced, and the nanocrystalline high-entropy alloy powder powder the preparation method thereof are suitable for industrial large-scale preparation.