146results about How to "Many reaction sites" patented technology

The invention provides a thermosetting resin composition as well as a prepreg, a laminated board and a circuit carrier containing the same. The thermosetting resin composition comprises thermosetting resin, a laser direct forming additive, an inorganic filler, and a silane coupling agent with 2-3 groups capable of being hydrolyzed at each of two ends of a molecular chain. The laser direct forming additive is added in the thermosetting resin composition provided by the present invention to ensure that a circuit can be formed on thermosetting resin after laser irradiation and metallization, the CTE of the composition can be reduced and the absorption of laser energy by a matrix can be enhanced by adding the inorganic filler and the silane coupling agent with 2-3 groups capable of being hydrolyzed at each of the two ends of the molecular chain, the activation rate of an LDS auxiliary agent is effectively improved, the attachment and the sedimentary thickness of the matrix to copper are obviously enhanced at the same time, and three types of components mutually cooperate with the thermosetting resin to ensure that the thermosetting resin composition has a low coefficient of thermal expansion, thereby making the prepared circuit carrier have relatively good quality of signal transmission.

The invention belongs to the field of energy sources, and particularly relates to a carbon-based composite fuel cell cathode oxygen reduction catalyst and a preparation method thereof. The carbon-based composite fuel cell cathode oxygen reduction catalyst disclosed by the invention is a molybdenum ion-doped mesoporous carbon-graphene complex and is prepared by the following steps: firstly, synthesizing a mesoporous carbon-graphene precursor with a soft template method; carrying out in-situ doping on molybdenum ions, and then burning in an argon atmosphere. The method disclosed by the invention is simple in process and easy to operate; the synthesized material has an ordered mesoporous structure, more active sites, and relatively good electron transport performance; the mesoporous carbon-graphene complex is a novel effective carbon carrier; and inorganic elements can be doped or other non-noble metal catalysts can be loaded, so that the carbon-based composite fuel cell cathode oxygen reduction catalyst can be applied to the field of various energy sources.

The invention relates to a method for preparing nano calcium peroxide by chemical modification. The method comprises the following steps: adding a certain amount of dispersing agent into a prepared calcium salt water solution, and mixing under ultrasonic conditions to prepare a bottom solution; slowly and dropwisely adding oxydol with a certain concentration into the continuously stirred bottom solution, reacting in an ice water bath, and continuing the reaction for 15-20 minutes after the dropwise addition is completed; and centrifugating the mixed solution, repeatedly washing the precipitate with deionized water and isopropanol, and drying in a vacuum drying oven for 12-24 hours to obtain the nano calcium peroxide. The method has the advantages of simple technique, mild reaction conditions and short reaction time; the dispersing agent added in the reaction process is nontoxic and harmless, and thus, no pollutant is generated in the production process; and the prepared product has favorable properties, and the particle size of the nano calcium peroxide is 100nm or so. The invention provides a simple effective new way for preparing nano calcium peroxide.

The invention discloses a hexagonal boron nitride modified graphitized carbon nitride composite optical catalyst as well as a preparation method and application thereof. According to the composite optical catalyst, by taking graphitized carbon nitride as a carrier, laminated hexagonal boron nitride modifies the graphitized carbon nitride carrier. The preparation method comprises the following steps: mixing the hexagonal boron nitride with a graphitized carbon nitride precursor; and calcining the mixed precursor to obtain the hexagonal boron nitride modified graphitized carbon nitride composite optical catalyst. The hexagonal boron nitride modified graphitized carbon nitride composite optical catalyst disclosed by the invention has the advantages of being environmentally friendly, fully free of metal doping, large in specific surface area, high in photoproduction electron-hole separating efficiency, high in optical catalytic activity, good in stability, corrosion-resistant and the like. The preparation method has the advantages of being simple, low in cost of raw materials, less in energy consumption, easy to control conditions and the like. The composite optical catalyst disclosed by the invention is used for degrading dye wastewater and has the advantages of being simple in application method, stable in optical catalytic performance, high in corrosion resistance, high in dye wastewater degrading efficiency.

The invention relates to an autotrophic denitrification advanced denitrification device. The device comprises an autotroph reactor, a water distribution pipe, a water inlet pipe and a backwashing water inlet pipe which are arranged at the lower part of the reactor, and a water outlet pipe arranged at the upper part of the reactor, wherein the interior of the autotroph reactor sequentially comprises a water distribution layer and a composite filler layer formed by a sulfur filler layer and a suspension filler layer along a water flow direction. The invention also relates to an autotrophic advanced denitrification method. The method makes a treatment bed layer in an expanded state through controlling a water inlet flow rate, reduces bed layer resistance, makes reaction sites increased, and improves denitrification efficiency.

The invention relates to a preparation method of a high-specific-capacity lithium-rich anode material, belongs to the field of chemical power source material preparation and lithium ion battery anode materials. The preparation method comprises the following steps of dissolving manganese acetate, nickel acetate, cobaltous acetate and lithium acetate in a solvent, stirring the manganese acetate, the nickel acetate, the cobaltous acetate and the lithium acetate so as to obtain an acetate solution which is uniformly mixed, carrying out magnetic stirring and evaporating under heating of a water bath until a mixing liquid is thick colloid, and placing the mixing liquid in a drying box to dry so as to obtain precursor powder; warming the dried precursor powder to calcine twice, and reducing to room temperature by adopting a furnace cooling manner so as to obtain a multi-element lithium-rich material Li1.2Mn0.54Ni0.13 Co0.13O2. A material prepared by the preparation method provided by the invention is high in bulk phase crystallinity, the grain diameter of a material is small, the distribution is uniform, a transition metal element proportion approaches to a theoretical value, a synthesis step is simple, the material is easy for mass production, synthesizing nondeterminacy factors in a process are less, the characteristics give the high specific capacity and the cycling stability for the material, and an electrochemical property of the material is excellent.

The invention belongs to the technical field of nano material preparation, in particular to a g-C3N4/MXene/CuZnIn2S4 nano composite photocatalyst and a preparation method thereof. CuZnIn2S4 which is taken as a widely-used photocatalyst can improve the photocatalytic activity by adjusting the morphology and increasing the number of exposed active sites; and MOF heterojunction has high specific surface area and rich pore structure, and can solve the problem of flexible coordination between complex multiphase metals and ligands and provide favorable conditions for the construction of efficient photocatalysts. The preparation method of the composite photocatalyst includes introducing g-C3N4 and MXene into the CuZnIn-MOF heterojunction; and vulcanizing to obtain a target product, namely, the g-C3N4/MXene/CuZnIn2S4 nano composite photocatalyst. The method has the advantages that the CuZnIn2S4 prepared by taking MOF as a template has an ultra-large specific surface area, provides more loadingsites for coupling of the CuZnIn2S4 and the g-C3N4, and thus the exposure number of the active sites is increased, and the introduction of the MXene can obviously improve the conduction capability ofcarriers, so that the photocatalytic activity of the photocatalyst is obviously improved.

The invention discloses a lithium air battery cathode material and a preparation method thereof, and a lithium air battery. The cathode material is a cobalt sulfide which is a hollow core-shell dodecahedron structure; ZIF-67 and a sulphur source are dissolved in a solvent to form a mixed solution; the mixed solution is subjected to heating, heat preservation, cooling and drying by employing a hydrothermal method to take out a precipitate, namely the lithium air battery cathode material. The hydrothermal method is employed to perform vulcanization of the ZIF-67 to obtain the cathode material, the preparation method is simple, the cathode material has the electrochemical catalytic activity, the lithium air battery prepared by employing the cathode material is excellent, has the coulombic efficiency up to 86.6%, can show better reversibility, and can effectively improve the cycle life of the battery: when the specific discharge capacity is controlled to 500 mAh g<-1>, the lithium air battery can stably cycle for 32 loops until the voltage is stabilized above 2.0V.

The invention provides an environment-friendly organic silicon modified TPU (Thermoplastic Polyurethane) hot melt adhesive and a preparation method thereof. The organic silicon modified TPU hot melt adhesive is prepared from the following preparation raw materials in parts by weight: 50 to 70 parts of polyester polyol, 30 to 40 parts of diisocyanate, 5 to 10 parts of hydroxyalkyl-terminated polydimethylsiloxane, 10 to 20 parts of hexaalkoxysilane coupling agent, 10 to 20 parts of acrylic resin, 5 to 8 parts of silica, 1 to 5 parts of diatomite, 2 to 8 parts of chain extender, 1 to 5 parts of catalyst and 1 to 6 parts of antioxidant. The organic silicon modified TPU hot melt adhesive provided by the invention has apparent viscosity which is 5,100MPa.s to 5,800MPa.s, high viscosity and peelstrength which is 52N/2.5cm<2> to 58N/2.5cm<2>, and has favorable bonding strength, moderate hardness, melting point which is 71 to 80 DEG C and low melting point, moreover, cannot release a harmful component in a use process, and is safe and environmentally friendly.

The invention takes Mn stress-free fleur-de-lis as a blank group and utilizes a MnSO4 solution to respectively stress experimental groups of fleur-de-lis for 1 month and 2 months. In situ manganese-enriched biochars are acquired through pyrolysis under N2 atmosphere after harvesting treatment; the biochars are respectively named as BC-L0, BC-L1, BC-L2, BC-R0, BC-R1 and BC-R2 on the basis of collection parts; Rhodamine B is taken as a probe molecule for researching influences of conditions of pyrolysis temperature (500 DEG C, 700 DEG C and 900 DEG C) and pyrolysis time (0.5 h, 1 h and 2 h) andthe like on adsorption capacity of biochars, and screening the preparation conditions when the adsorption capacity of biochars is optimal; SEM, EDS, XRD, AAS and the like are adopted for physically representing biochars, and meanwhile establishing a Fenton-like system and researching the catalytic capacity of the manganese-enriched biochars; a biochar particle modified glassy carbon disc electrodeis utilized to research electrocatalytic reduction reaction of H2O2 in neutral medium on different biochar catalysts through a cyclic voltammetry scanning method, so as to represent electro-catalyticperformances of different biochars.

The invention discloses a catalyst for degrading chlorophenol pollutants and a preparation method and applications thereof, and belongs to the fields of environment function materials and catalysis. The catalyst is prepared by following steps: at first, reacting aminated reduced graphene oxide with 3,5-dibromo salicylaldehyde in an ethanol system to synthesize 3,5-dibromo salicylaldehyde Schiff base; and then reacting copper acetate monohydrate with 3,5-dibromo salicylaldehyde Schiff base in an ethanol system to synthesize a Schiff base-copper complex. The catalyst can activate chlorophenol pollutants in a potassium persulfate degradation water solution. The method of eliminating chlorophenol pollutants comprises following steps: (a) preparing a catalyst solution from the catalyst and deionized water, and preparing a potassium persulfate solution from potassium persulfate and deionized water; and (b) mixing the catalyst solution, the potassium persulfate solution, and a water solutioncontaining chlorophenol pollutants, adding the mixed solution into deionized water, and carrying out reactions under vibration in the absence of light. The preparation method is simple, the catalyst activates potassium sulfate under mild conditions, and the energy consumption and pollution are low.

The invention belongs to the technical field of photopurifying agents and discloses a neutral formaldehyde photopurifying agent and a preparation method thereof. The preparation method disclosed by the invention comprises the following steps: S1, calcining dicyandiamide under 500 to 650 DEG C to obtain graphite-phase carbon nitride; S2, grinding the graphite-phase carbon nitride into powder and calcining again under 400 to 550 DEG C in the air atmosphere to obtain carbon nitride; S3, dispersing carbon nitride into water to obtain the neutral formaldehyde photopurifying agent. The preparation method disclosed by the invention has the advantage of simpleness in operation; the prepared formaldehyde photopurifying agent has the advantages of high activity, larger specific surface area (170.2 m<2>/g), ability in providing more reaction sites, stronger absorption to 200 to 1100nm waveband light and stronger photocatalytic degradation purifying ability under visible light irradiation; when being applied to photocatalytic degradation of formaldehyde gas, 61% of formaldehyde can be degraded within 16 hours; furthermore, neutral water is utilized as a dispersing agent, so that more safety inuse is achieved, and dispersity is stable and durable.

Provided is a preparation method of a copper oxidechemically modified electrode for detecting glucose. The method comprises the main steps that according to the mass ratio of copper ions to urea 3:2, a copper salt solution is slowly and dropwise added to the urea solution to generate a cupper ion complex having high coordination number; then, the complex is put in a hydrothermal reaction kettle to perform hydrothermal reaction, and a copper oxide precursor is prepared; the precursor is decomposed into rice-shaped copper oxide at high temperature; then the copper oxide is matched with a Nafion solution to obtain a rice-shaped copper oxide modifying solution; finally the solution is dropwise added to the surface of the solid electrode to obtain the rice-shaped copper oxidechemically modified electrode. The preparation method is simple in operation, a template agent and template are omitted, and the copper oxide having a unique rice-shaped structure can be obtained. The prepared chemically modified electrode has the good electrochemical responsiveness to glucose, low detection limit (0.000075 mM), a wide detection range (0.001-2.361mM) and high sensitivity (2.376Ma.mM-1.cm-2).

The invention provides a method for preparing a nano-structure of magnesium, which includes the following steps of: fully mixing MgO powder with C powder to make a block; then adopting an electric-arc heating method for evaporation to generate the nano-structure of magnesium; and selecting a variety of carbons to adjust the appearances of the nano-structure of magnesium. The method is simple in the device, high in resultant velocity, low in cost, and easy for realizing industrialized batch production. Products of the nano-structure of magnesium, which is obtained via the method, are less than 30 nanometers in dimension, with high purity and controllable appearances and structures. Besides, products of the nano-structure of magnesium have superb kinetic property for absorbing/desorbing hydrogen, with promising application prospects.

The invention discloses a modified acetic acid lignin polyurethane adhesive and a preparation method thereof and belongs to the field of polyurethane adhesive preparation. The method includes following steps: (1), subjecting acetic acid lignin to hydroxylation modifying to obtain hydroxylated acetic acid lignin; (2), allowing hydroxylated acetic acid lignin to react with an amination reagent to obtain multi-hydroxy aminated acetic acid lignin; (3), copolymerizing lignin after being modified twice with polyols, isocyanate and catalyst which are metered well to obtain a high-strength polyurethane adhesive material. The problem that lignin is low in reaction activity and few in reaction site and the problem that polyurethane adhesives are high in cost and difficult in degradation are solved.The polyurethane adhesive has good mechanical performance and adhesiveness, needed biomass is extensive in raw material source, the polyurethane adhesive is environment-friendly and degradable, and high-value utilization of lignin is realized.

The invention provides a method for preparing micro-porous carbon-structural electrode material from plant materials and application of the micro-porous carbon-structural electrode material and belongs to the field of new-generation energy storage. The method includes the steps of firstly, frequently boiling water and ethyl alcohol mixture containing cellulose-enriched plants to remove proteins, fats, sucrose organics; secondly, heating and drying and then subjecting the mixture to high-temperature calcination in atmosphere of protective gases, cooling naturally to obtain a micro-porous carbon-structural material; thirdly, putting the micro-porous carbon-structural material in mixed solution of sulfuric acid and nitric acid while stirring continuously for 10-20 minutes to achieve surface functionalization. According to the method, the cellulose-enriched plant residues are utilized for preparing the electrode material for the first time, acid solution can be recycled, the whole preparation is simple and free of pollution, the method can be applied to production in scale, and the prepared electrode material has excellent performance which is similar to the lithium-ion storage performance of graphene material, has high practicable value, and has potential to substitute for the commercial graphite to serve as the novel lithium-ion battery electrode material.

The invention provides a modification method for nano calcium peroxide with controllable particle size. The modification method comprises the following steps: adding a certain amount of a calcium salt to dispersing agent solutions of different concentrations; mixing to prepare a reaction base solution under an ultrasonic condition; slowly dripping hydrogen peroxide solution with a certain concentration to the reaction base solution at a certain rate, wherein the reaction base solution is stirred continuously; after the dripping is completed, allowing the reaction to continue for 10-20 min; after the complete reaction, the mixed solution is centrifuged to obtain precipitate; washing repeatedly with deionized water and absolute ethyl alcohol; placing in a vacuum drying box for drying for 24-48 h to obtain the nano calcium peroxide with different particle sizes. The modification method has the benefits that the process is simple; the reaction conditions are mild; the reaction time is short; the added dispersing agent in the reaction is non-toxic and harmless, low in cost and easy to obtain; no pollutants is generated in the production process; the prepared product is high in performance; nano calcium peroxide of different particle sizes can be prepared under different reaction conditions, and the average particle size is 10-200 nm. The invention provides a novel synthetic method for the nano calcium peroxide for groundwater remediation, and the particle size of the prepared calcium peroxide can be controlled.