237 results about "Doped graphene" patented technology

The invention relates to the technical field of electrode paste, in particular to electrode paste for a submerged arc furnace and a preparation method of the electrode paste. Comprising three-level grain size distribution anthracite aggregate which is electrically calcined at high temperature and modified by a KH-550 silane coupling agent, a modified silicon carbide whisker and boron-doped graphene-like carbon nitride composite filler, a maleic anhydride-mediated compatible medium-temperature pitch-polyborosiloxane binder and a graphite powder-borax functional additive. A step-by-step mixing and two-stage sintering process is adopted in the preparation process, a covalent bond interface bridging structure is constructed through the coupling agent, the composite dispersing agent regulates and controls the multi-dimensional network distribution of the filler, and the process synergistically improves the compactness and the interface bonding force of the green body. The electrode paste is firm in interface bonding, can form a ceramic protective phase at a high temperature, has excellent conductivity and mechanical strength, and prolongs the service life of the electrode paste for the submerged arc furnace.

The present invention relates to the technical field of high thermal insulation carbon materials and provides a carbon fiber-doped graphene oxide foam material, a preparation method therefor, and a use thereof. In the present invention, graphene oxide and carbon fibers are composited in a hydrothermal synthesis manner, the resulting composite is processed into a composite aerogel in a freeze drying manner, and the composite aerogel is carbonized and graphitized to prepare the carbon fiber-doped graphene oxide foam material. The carbon fiber-doped graphene oxide foam material of the present invention can resist a high temperature of 2000-3000℃. The carbon fiber-doped graphene oxide foam material has a heat conductivity coefficient of 0.16-0.27 W / m·K and a porosity of 85-95%. The carbon fiber-doped graphene oxide foam material has excellent high-temperature resistance and stability, and maintains good mechanical properties and structural strength while improving the heat insulation performance.

The invention provides application of a metal ion doped aminated graphene oxide membrane material in catalyzing CO2 to synthesize cyclic carbonate. The metal ion doped aminated graphene oxide membrane material has an acidic catalytic site and an alkaline catalytic site at the same time, and a two-dimensional interlayer channel of the metal ion doped aminated graphene oxide membrane material also has a confinement effect. In the process of catalyzing a CO2 / epoxy compound cycloaddition reaction, epoxy compound molecules entering a two-dimensional interlayer confinement channel of the metal ion doped aminated graphene oxide membrane material are subjected to efficient ring opening under the combined action of organic amine molecules and metal ions and react with CO2; and finally, realizing CO2 high-efficiency (the reaction time is less than or equal to 5 minutes, and the conversion rate of the epoxy compound is 75-100%) synthesis of the cyclic carbonate under the conditions of room temperature and low pressure (greater than 0.1 MPa and less than or equal to 1 MPa).

The present application relates to thermal insulation coating technical field, specifically to a kind of low VOCs ultraviolet resistant thermal insulation coating composition and its performance testing device, consisting of the following mass parts components: water-based acrylic resin 30-45 parts, nitrogen-doped graphene 1-3 parts, nano composite powder 2-5 parts, low water absorption and expansion glass microsphere 8-12 parts, silane coupling agent modified sepiolite 5-10 parts, silane coupling agent KH560 0.5-1.5 parts, ultraviolet absorber UV-9 0.3-0.8 parts, hydroxyethyl cellulose thickening agent 0.2-0.5 parts;Composition meets the following conditions: (1) VOCs content≤50g / L;(2) ultraviolet absorption rate≥95%;The present application realizes the purpose that VOCs content is far lower than traditional solvent type coating through the synergistic effect of water-based acrylic resin system and low water absorption and expansion glass microsphere, while nitrogen-doped graphene and nano ITO-SiO2 Composite powder form ultraviolet-infrared dual-effect shielding layer, ultraviolet absorption rate, infrared reflectivity greatly improve, solve the problem that traditional anti-UV coating function is single, VOCs is overproof.

The invention discloses an MOF / nitrogen-doped graphene-based electrocatalyst and a preparation method thereof, nitrogen-doped graphene has a single nitrogen configuration, and the nitrogen-doped graphene is pyridine nitrogen or pyrrole nitrogen; the MOF is ZIF-67, and the MOF is connected with a nitrogen atom of the nitrogen-doped graphene through a coordinate bond. Carrying out covalent functionalization on the surface of the graphene by using a specific pyridine nitrogen configuration polymer; then growing MOF in situ by taking the nitrogen-doped graphene as a precursor, and then calcining to realize the compounding of the nitrogen-doped graphene with the single nitrogen configuration and the MOF. According to the prepared MOF / nitrogen-doped graphene composite electrocatalyst, the stability and the electrocatalytic activity (such as OER, HER and ORR) of MOF can be remarkably improved. Meanwhile, the preparation method is simple in process, low in cost and remarkable in industrial application potential.

The invention discloses an iron-carbon composite material for heavy metal contaminated soil remediation and a preparation method of the iron-carbon composite material, and belongs to the field of heavy metal contaminated soil remediation. The iron-carbon composite material comprises rape straw, hydroxyapatite, zero-valent iron, sulfydryl functionalized magnetic cerium oxide and nitrogen-doped graphene quantum dot-sodium alginate. The sulfydryl-functionalized magnetic cerium oxide is prepared from cerium nitrate and ferric nitrate through precipitation, calcination and sulfhydrylation, and the nitrogen-doped graphene quantum dot-sodium alginate is prepared from citric acid and urea through microwave reaction, dialysis, mixing and freeze drying; the preparation method comprises the following steps: treating straws and hydroxyapatite to obtain ball-milled phosphorus-containing biochar, mixing the ball-milled phosphorus-containing biochar with zero-valent iron and two modifiers, and carrying out molding and high-temperature calcination to obtain the phosphorus-containing biochar-based composite material. The material has a remarkable remediation effect on the heavy metal contaminated soil, can effectively reduce the activity of heavy metals in the soil, has the characteristics of environmental friendliness and high stability, and is suitable for treating the soil compositely contaminated by the heavy metals such as cadmium and lead.

The invention relates to an IrO2-Ta2O5 titanium anode coating based on graphene doping and temperature programming sintering synergistic enhancement and a preparation method of the IrO2-Ta2O5 titanium anode coating, and belongs to the technical field of electrode material preparation. According to the method, graphene is doped in an IrO2-Ta2O5 coating, the content of the graphene is controlled to be 0.2-0.8 mg / mL, preferably 0.6 mg / mL, the content of iridium is 26 g / m, and a 200-500 DEG C temperature programming sintering process is adopted. By optimizing the graphene dispersing and sintering process, the conductivity, the electrocatalytic activity and the structural stability of the coating are remarkably improved. Experimental results show that the coating has lower charge transfer resistance and higher electric double layer capacitance and oxygen evolution reaction activity, and the strengthening life of the coating exceeds 1100 hours and is far longer than that of a traditional titanium anode coating. The method is suitable for high-requirement electrochemical scenes such as electrolytic copper foil and chlor-alkali industry, and has a good industrial popularization prospect.

The invention relates to the technical field of superhard materials, and particularly discloses a polycrystalline diamond compact and a preparation method and application thereof.The preparation method of the polycrystalline diamond compact comprises the following steps that WC-Co alloy powder is sintered to obtain a hard alloy matrix; uniformly mixing nano diamond powder, micron diamond powder and cubic boron nitride, adding a reinforcing agent and a binding agent, and uniformly mixing to obtain a polycrystalline diamond layer mixture; the reinforcing agent is a nitrogen-boron doped graphene bonded amino carbon nanotube; a gradient transition layer raw material and a polycrystalline diamond mixture are uniformly spread on the surface of the hard alloy matrix in sequence, and then a composite blank is obtained through mold pressing; and sintering the composite blank to obtain the polycrystalline diamond compact. Graphene and carbon nanotubes are compounded to form a reinforcing agent with a three-dimensional network structure, so that the strength and wear resistance of the material are improved, and the service life of the material under harsh working conditions is prolonged.

The invention relates to the technical field of palladium recovery, in particular to a method for recovering palladium. According to the technical scheme, the method comprises a precipitant pre-synthesis stage, a targeted palladium precipitation stage and a multi-stage reduction purification stage, and the precipitant pre-synthesis stage comprises the step of adding 10-15 parts by mass of butanedione, 18-30 parts by mass of hydroxylamine hydrochloride and 0.1-0.3 part by mass of iron phthalocyanine into a reaction kettle. Through a composite precipitator system and a multi-stage reduction process, the method has safety and high efficiency: flammable and explosive solvents such as ethanol and highly toxic reducing agents such as hydrazine hydrate are not needed, so that the potential safety hazard of production and the environment-friendly treatment cost are remarkably reduced; high-selectivity capture and efficient reduction of palladium are achieved through magnetic separation of magnetic nano-microspheres, induced precipitation of nitrogen-doped graphene quantum dots and a staged temperature-control and pressure-control reduction technology, the palladium recovery rate and purity are high, the process period is short, operation is controllable, and the method is suitable for industrial continuous production.

The application discloses a phosphine ligand modified nitrogen-doped graphene oxide / porous carbon supported metal catalyst and a preparation method and application thereof. The catalyst comprises phosphine ligand modified nitrogen-doped graphene oxide / porous carbon and rhodium supported on the nitrogen-doped graphene oxide / porous carbon; and the molar ratio of rhodium to phosphine is 1:1-100 in terms of elements. The phosphine ligand modified nitrogen-doped graphene oxide / porous carbon supported metal catalyst has better catalytic activity and product selectivity.

The application relates to the technical field of graphene, in particular to platinum-loaded nitrogen-doped graphene as well as a preparation method and application thereof. The preparation method of the platinum-loaded nitrogen-doped graphene comprises the following steps: mixing graphene oxide, a platinum salt and a solvent to form a mixed solution, and then performing a hydrothermal reaction to prepare graphene oxide-platinum salt composite powder; mixing the graphene oxide-platinum salt composite powder with an amino compound, and performing ball milling to prepare amino-modified graphene oxide-platinum salt composite powder; and performing microwave irradiation on the amino-modified graphene oxide-platinum salt composite powder to prepare platinum-loaded nitrogen-doped graphene. The preparation process is simple, and the prepared platinum-loaded nitrogen-doped graphene has good oxygen reduction catalytic activity.

The invention discloses a long-life power lead-acid storage battery based on electrolyte-polar plate synergistic modification, and relates to the technical field of lead-acid storage batteries. According to the invention, the carbon nanotubes, the potassium sodium tartrate and the sodium sulfate are added into the electrolyte of the lead-acid storage battery, the graphene and the lanthanum oxide are doped into the positive active material, and the surface of the negative electrode is coated with the polypyrrole layer, so that the synergistic modification of the electrolyte and a polar plate is realized; according to the design, the conductivity is remarkably improved, the polar plate vulcanization is inhibited, and the structural stability is enhanced, so that the cycle life and the capacity retention ratio of the battery are greatly improved.

The application relates to the technical field of nanometer carbon material preparation, in particular to a nitride / carbide-doped graphene composite material and a preparation method and application thereof. A physical peeling method is used to treat graphite raw materials to obtain intrinsic graphene powder; the intrinsic graphene powder is mixed with powder of at least one oxide ceramic precursor, the intrinsic graphene powder is coated on the surface of the oxide ceramic precursor powder to form a composite precursor; the composite precursor and at least one doping precursor are subjected to high-temperature reaction in a protective atmosphere, the oxide ceramic precursor is reduced and nitrided or carbonized into a corresponding nitride or carbide ceramic phase, meanwhile, the intrinsic graphene is doped to obtain the nitride / carbide-doped graphene composite material. The composite material has excellent heat conduction performance, predictable catalytic activity and mechanical performance, and can be widely applied to heat dissipation of advanced electronic components, high-strength structural ceramics or replacement of noble metals as chemical catalysts.

The application discloses tar-based nitrogen-doped graphene oxide and a preparation method and application thereof. The preparation method comprises the following steps: 1) uniformly mixing pine nut shell tar powder, nano magnesium oxide and KOH according to a mass ratio of 1:(6-8):(1-2) to prepare a precursor; 2) placing the precursor into a tube furnace to perform carbonization under a nitrogen atmosphere, adopting two-stage heating, the first stage is to heat from room temperature to 300 DEG C and keep the temperature, the second stage is to heat to 900 DEG C, after keeping the temperature, cooling to room temperature; 3) drying the obtained solid product after acid pickling. The tar-based nitrogen-doped graphene oxide prepared by the application exhibits a good graphene structure, a large specific surface area, and rich pore structure and total pore volume. Meanwhile, the thin-layer graphene structure and the number of graphene layers are directly observed by HRTEM. In addition, the tar-based nitrogen-doped graphene oxide has a good double-layer capacitance and is an excellent supercapacitor material.

The invention relates to the technical field of electrochemical luminescence sensing, and discloses an electrochemical luminescence immunosensor for detecting interleukin-1 beta, a preparation method and application thereof, the electrochemical luminescence immunosensor comprises a working electrode, a reference electrode and a counter electrode; the working electrode comprises a substrate electrode and an ordered mesoporous silica film (SNF) modified on the surface of the substrate electrode; a composite nano-enzyme containing cobaltosic oxide nanoparticles and nitrogen-doped graphene quantum dots is loaded in a nano-pore channel of the SNF, the outer surface of the SNF is modified with an epoxy group, and an anti-interleukin-1beta antibody is covalently immobilized through the epoxy group; a detection system of the electrochemical luminescence immunosensor is a luminol / dissolved oxygen system. According to the electrochemical luminescence immunosensor, a luminol / dissolved oxygen system signal can be remarkably enhanced, and high-sensitivity and accurate quantitative detection of interleukin-1 beta is realized under a neutral condition.

The application relates to the field of plastic master batches, and provides a composite nano-silver-graphene antibacterial plastic master batch and a preparation method thereof; the master batch is composed of surface-modified silver / graphene composite fillers, a polypropylene matrix resin, maleic anhydride grafted polypropylene, polyvinylpyrrolidone and SEBS thermoplastic elastomer. The silver / graphene composite fillers are in-situ grown on the surface of doped graphene in the form of silver nanowires, and are modified by 3-aminopropyl triethoxysilane coupling agent to improve the interface compatibility. The components are blended and dispersed through a double-screw extrusion processing technology, and finally, the functional master batch with excellent mechanical properties and broad-spectrum antibacterial properties is obtained. The application solves the problems of poor antibacterial property and weak mechanical property of the existing plastic, and has good processing adaptability and application popularization potential.

The invention discloses a high-flame-retardant EVA (Ethylene Vinyl Acetate) foaming material and a preparation method thereof, and relates to the technical field of high polymer materials. The high-flame-retardant EVA foaming material is prepared from a coated functional filler, a nitrogen-doped graphene-like carbon / cobalt nano composite material, EVA, stearic acid, zinc stearate, zinc oxide, a foaming agent AC and dicumyl peroxide, a core-shell combined filler composed of a coated functional filler and a nitrogen-doped graphene-like carbon / cobalt nano composite material is uniformly distributed in an EVA three-dimensional network cross-linked matrix to form a porous material with a uniform closed cell structure, so that the flame retardant property is improved by virtue of a physical barrier effect and a catalytic carbon formation mechanism, and an efficient and stable conductive network is also constructed; the antistatic performance is optimized, and the application range of the EVA foaming material is widened.

The invention discloses a multi-layer co-extrusion foamed graphene-graphene oxide composite gas diffusion layer material and a preparation method thereof. The method comprises the following steps: S1, preparing sulfur-doped graphene oxide: S1-1, adding graphene oxide into a solvent, and carrying out ultrasonic dispersion; s1-2, adding a sulfur-containing doping agent, and uniformly stirring; s1-3, carrying out pyrolysis treatment; s2, co-extrusion foaming: S2-1, uniformly mixing the sulfur-doped graphene oxide, the PPS resin and the graphene powder to obtain a blended material; s2-2, adding an AC foaming agent, and uniformly mixing; s2-3, performing extrusion granulation on the mixture obtained in the step S2-2, and then performing mold pressing or blow molding to obtain a foam molding intermediate product; and S3, carrying out electrochemical oxidation mesh treatment. The problems that an existing gas diffusion layer material is insufficient in catalytic activity, single in structure, high in cost and the like are effectively broken through, and the gas diffusion layer material has remarkable advantages in the aspects of performance, structure and process.

The invention relates to a high-sensitivity treatment-free negative image CTP plate material and a preparation method thereof, and belongs to the technical field of CTP plate materials, the treatment-free negative image CTP plate material comprises a plate base and a photosensitive layer, the photosensitive layer contains a modified graphene oxide composite material, the modified graphene oxide composite material can promote rapid conduction of heat, strengthen scratch resistance and improve the sensitivity of the photosensitive layer, and the modified graphene oxide composite material is essentially formed by compounding an infrared absorption dye new indocyanine green onto nitrogen-aluminum co-doped graphene oxide, so that the infrared absorption dye new indocyanine green can be effectively absorbed by the nitrogen-aluminum co-doped graphene oxide; the specific preparation method comprises the following steps: doping nitrogen and aluminum elements in graphene oxide by using urea and aluminum nitrate nonahydrate to prepare nitrogen-aluminum co-doped graphene oxide, and then adding amino-modified new indocyanine green to react by taking dehydration esterification as a reaction principle, thereby obtaining the nitrogen-aluminum co-doped graphene oxide. The amino-modified novel indocyanine green is prepared from a short-carbon-chain diamine compound and novel indocyanine green under the action of amino and halogen.

The application belongs to the field of photoelectric materials and devices, and discloses a method for preparing metal-doped graphene oxide conductive ink, which comprises the following steps: immersing a metal substrate into an aqueous solution of graphene oxide, and carrying out a redox reaction to obtain reduced graphene oxide ink loaded with metal oxide particles. The method realizes the preparation of reduced graphene oxide conductive ink loaded with metal oxide particles through in-situ spontaneous redox reaction of graphene oxide and the metal substrate. Compared with the traditional method for preparing metal-doped graphene ink, the method can realize in-situ low-temperature redox, avoids the use of organic solvents or ionic liquids, reduces the residual organic matter, and significantly improves the conductivity by in-situ embedding of metal oxide particles.

The application relates to application of iron-nitrogen doped graphene in preparation of anti-radioactive enteritis drugs and belongs to the technical field of biological medicines. ZIF-8 powder, 1,10-phenanthroline powder, iron (II) acetate powder and a grinding medium are placed in a closed container to perform mechanical ball milling treatment to obtain a mixed powder; under the protection of inert gas, the mixed powder is placed in a preheated tube furnace to perform pyrolysis treatment, and is cooled to room temperature to obtain iron-nitrogen doped graphene. The iron-nitrogen doped graphene has NADH oxidase-like activity, can directly catalyze the conversion of NADH into NAD + , can rapidly supplement NAD + depletion caused by radiation, can enhance PARP-dependent DNA damage repair, can reduce the generation of active oxygen (ROS), can reduce intestinal cell death and can protect the integrity of intestinal structure, and can realize efficient protection of radioactive enteritis. Moreover, the problem of low-efficiency biosynthesis of NAD + supplementation in existing radioactive intestinal injury protection technologies is solved.

A method for rapidly detecting and identifying food-borne pathogens by using a two-dimensional / zero-dimensional MXene / GQDs Schottky heterojunction fluorescence sensor array based on machine learning comprises the following steps: synthesizing three nitrogen-doped graphene quantum dots through a hydrothermal method, determining the optimal excitation wavelength, concentration, reaction temperature and pH value of the nitrogen-doped graphene quantum dots, and further determining the fluorescence intensity of the nitrogen-doped graphene quantum dots under the optimal condition; constructing a fluorescence sensor array, mixing the three graphene quantum dots with target heavy metal ions, incubating, then measuring fluorescence intensity to obtain fluorescence response data, and normalizing the data to obtain the fluorescence response data. And analyzing by using machine learning methods of a decision tree, a support vector machine, K nearest neighbor, linear discriminant analysis, naive Bayes and a neural network. The prepared fluorescence sensor array can rapidly identify heavy metal ions, is excellent in accuracy, sensitivity and stability, provides an economical and efficient solution for heavy metal ion detection, and has remarkable application potential in environmental monitoring.

The invention discloses dual-application nitrogen-doped graphene / dopamine grafted carboxymethyl cellulose aerogel as well as a preparation method and application thereof, and relates to the technical field of graphene aerogel preparation. The preparation method comprises the following steps: dispersing graphene oxide in water to obtain a graphene oxide dispersion liquid; mixing the graphene oxide dispersion liquid with ethidene diamine and dopamine grafted carboxymethyl cellulose, and performing heating reaction to obtain composite graphene hydrogel; the composite graphene hydrogel is sequentially subjected to washing, liquid nitrogen quick freezing, freeze drying and calcination, and the dual-application nitrogen-doped graphene / dopamine grafted carboxymethyl cellulose aerogel is obtained. The nitrogen-doped graphene / dopamine grafted carboxymethyl cellulose aerogel has the advantages of ultralight weight, hyperelasticity, rapid shape recovery, strong adsorption capacity, good electrochemical performance and the like, and can be used as an adsorption material for adsorption of oil, heavy metal Cr and the like and as an electrode material for preparation of a supercapacitor.

The invention discloses an extraction head for detecting malathion residues in agricultural products and a detection method applying the extraction head, the extraction head is a composite material of poly (5-amino indole pyrrole)-ionic liquid-porous nitrogen-doped graphene, and the ionic liquid is 1-butyl-3-methylimidazolium hexafluorophosphate. The extraction head has the beneficial effects that the extraction head made of the composite material has relatively good stability and repeatability, and can be used for rapidly detecting the residue of malafos sulfur in agricultural products.

The invention discloses a high-thermal-conductivity pouring sealant based on modified nitrogen-doped graphene as well as a preparation method and application of the high-thermal-conductivity pouring sealant, and belongs to the technical field of pouring sealants. The pouring sealant comprises a pouring sealant matrix and modified nitrogen-doped graphene, wherein the pouring sealant matrix comprises 50-85 parts of matrix resin, 1-10 parts of a filler, 1-5 parts of a flexibilizer and 10-30 parts of a solvent; the modified nitrogen-doped graphene is prepared by the following steps: uniformly adsorbing manganese carbonate in nitrogen-doped graphene, treating in a high-temperature reducing atmosphere, uniformly distributing lithium fluosilicate in the nitrogen-doped graphene, and finally sintering. The nitrogen-doped graphene is pretreated by adopting manganese carbonate and lithium fluosilicate, so that the dispersity and the compatibility with a resin matrix of the nitrogen-doped graphene are effectively improved, the heat-conducting property, the tensile strength, the hardness and the heat stability of the pouring sealant are improved, the construction performance is good, the nitrogen-doped graphene can stably work in a high-temperature and high-power environment, and the service life of the pouring sealant is prolonged. And the packaging method can be widely applied to packaging of the vehicle-mounted charger transformer of the electric vehicle.

The invention discloses low-paper-scraping ink and a preparation method thereof. The low-paper-scraping ink comprises the following raw material components in percentage by mass: 3.7-3.9% of a quantum lubricant; 4.0%-4.7% of a pressure rheological agent; 1.6%-2.0% of a coupling curing agent; 88.9% to 89.6% of a solvent; 0.3%-0.4% of a dispersion stabilizer; 0.2%-0.3% of a pH regulator; 0.1%-0.2% of a preservative; the invention relates to the technical field of ink. According to the ink for the low-scrape paper and the preparation method thereof, nitrogen-doped graphene is used for constructing an ultralow friction interface, reducing the friction coefficient and improving the writing comfort, and meanwhile, the nitrogen-doped graphene is matched with the krill protein derivative to form a biological lubricating layer with a self-repairing function, so that paper fiber damage in the high-speed writing process is effectively avoided; the pressure response index is increased through hydrogen bond reinforced polyacrylamide, support is provided for effective covering of a lubricating layer after multiple times of writing, photo-thermal synergistic efficient curing is achieved in cooperation with copper phthalocyanine polylactic acid composite particles, the weather resistance is improved, and meanwhile the paper scraping rate is smaller than 0.3%.

The invention discloses a preparation method of an in-situ nitrogen-doped graphene reinforced copper-based composite material based on external pyrolysis, and relates to the technical field of metal-based composite material preparation. The method specifically comprises the following steps that copper powder is placed in a heating device, and a solid nitrogen-containing carbon source is placed in an external pyrolysis device; after the system is vacuumized and cleaned, inert gas and hydrogen are introduced, and the heating device is heated to a specific temperature and is subjected to heat preservation. An external pyrolysis device is started, the temperature is increased to the pyrolysis temperature, a nitrogen-carbon-containing small molecule precursor is generated and conveyed into a heating device, in-situ growth is conducted on the surface of the copper powder, and high-dispersion composite powder is prepared; and sintering the powder to obtain the densified high-dispersion nitrogen-doped graphene / copper composite block material. According to the method, the in-situ uniform growth of the nitrogen-doped graphene on the surface of the copper powder is realized through a solid nitrogen-containing carbon source external pyrolysis technology in combination with a synergistic mechanism of copper powder regulation and control, precursor directional transportation and in-situ doping growth, and a new way is provided for controllable synthesis of the copper-based composite material.

The invention discloses a mica-doped graphene epoxy zinc-rich primer and a preparation method thereof. The mica-doped graphene epoxy zinc-rich primer comprises a component A and a component B, the component A comprises the following components in parts by mass: 10-60 parts of epoxy resin, 20-50 parts of graphene mica powder, 20-60 parts of zinc powder, 0.5-10 parts of an auxiliary agent and 5-20 parts of a first solvent; and the component B comprises 5-50 parts of a curing agent and 20-80 parts of a second solvent. The microstructure of the mica powder is in a lamellar shape and is similar to the lamellar structure of graphene, so that after the mica is activated by the silane coupling agent, the mica is uniformly attached to the surface of the graphene and wraps the lamellar layer of the graphene, the problem that the graphene is agglomerated and settled due to poor dispersity is effectively prevented, and meanwhile, the mica serving as an inorganic filler has a good anti-agglomeration effect. According to the graphene mica powder disclosed by the invention, the graphene agglomeration is reduced, the excessive strong conductivity generated by graphene agglomeration is reduced, and the activated mica overcomes the defects of graphene in an epoxy resin zinc-rich coating, so that the graphene mica powder disclosed by the invention simultaneously improves the corrosion resistance and the mechanical property of the coating and prolongs the service life of the coating.

The application discloses a kind of adsorbents for noble metal recovery and preparation method thereof, further provide a kind to be used in the noble metal recovery method of the catalyst, wherein the adsorbents for noble metal recovery includes nitrogen-doped graphene-SiO2 Hybrid Material, the nitrogen-doped graphene-SiO2 Hybrid Material includes graphene-SiO2 Hybrid Material and nitrogen doped therein, wherein the molar amount of nitrogen in the nitrogen-doped graphene-SiO2 Hybrid Material and the total molar amount of C and Si are 1: (55-10050) ratio. The noble metal recovery adsorbent of the application can effectively recover noble metal Au in wastewater, has strong noble metal recovery adsorption capacity, high recovery rate, especially for the catalyst washing produced in the preparation process of vinyl acetate catalyst containing lower content of noble metal element Au has higher noble metal recovery adsorption capacity.

The invention discloses a method for rapidly preparing a graphene-based supported catalyst through electric explosion, and belongs to the field of catalyst preparation. The implementation method comprises the following steps: taking graphene or doped graphene as a carrier, and uniformly loading metal salt on a graphene or doped graphene skeleton in a nanocrystalline form through a metal salt solution dipping and freeze-drying process to obtain a precursor; the method comprises the following steps: placing a precursor in an insulation discharge cavity, connecting two ends of the insulation discharge cavity in series into a high-voltage pulse discharge device through red copper electrodes, applying instantaneous high-power pulse electric energy to the precursor, enabling the precursor to generate electric explosion, enabling the precursor to generate eigenstate transformation under the action of current density, forming a metal vapor and plasma mixed phase, and after energy storage discharge is finished, performing plasma discharge. Carrying out adiabatic expansion on the high-temperature and high-pressure air mass to generate Megt; 3, along with characteristic electromagnetic radiation, gaseous metal atoms are cooled and gathered on the carrier, and the supported nano-metal catalyst is formed. And collecting in a discharge cavity to obtain a final product, namely the graphene-loaded nano-metal catalyst.