41 results about "Graphite oxide" patented technology

The invention belongs to the technical field of transition metal sulfides, namely carbon materials, and particularly discloses a nickel cobalt sulfide/graphene/carbon nanotube composite material and a preparation method and an application thereof. The method comprises the following preparation processes: mixing graphene oxide with a carbon nanotube, and preparing a graphene oxide/carbon nanotube hybrid material through ultrasound; and carrying out in-situ growth of a nickel cobalt sulfide nanosheet on the graphene oxide/carbon nanotube hybrid material through a one-step hydrothermal process. The graphene oxide/carbon nanotube hybrid material prepared by the method has the advantages of a three-dimension porous space structure, excellent conductivity, large specific surface area, stable chemical property and the like; the final nickel cobalt sulfide/graphene/carbon nanotube composite material is controllable in morphology; the nickel cobalt sulfide nanosheet evenly grows on the graphene oxide/carbon nanotube hybrid material; and a unique base structure and high specific surface area of the graphene oxide/carbon nanotube hybrid material are fully utilized. The material disclosed by the invention can be used as an ideal high-performance electric catalytic material, and an electrode material for new energy devices of a lithium-ion battery, a super capacitor and the like.

The invention provides a hydrothermal preparation method of a graphene-coated sulfur/porous carbon composite material and relates to a preparation method of the graphene-coated sulfur/porous carbon composite material for a positive electrode material of a lithium-sulfur storage battery. The hydrothermal preparation method is used for solving the technical problem that the electrochemical property of the positive electrode material of an existing lithium-sulfur battery, namely a graphene-coated sulfur-containing composite material, is low. The hydrothermal preparation method comprises the steps of mixing and scattering the sulfur/porous carbon composite material with graphene slurry or oxidized graphene slurry, carrying out hydrothermal synthesis to prepare a hydrogel column, and drying to obtain the graphene-coated sulfur/porous carbon composite material. According to the graphene-coated sulfur/porous carbon composite material prepared by utilizing the hydrothermal preparation method, the outer surfaces of the graphene sheet layers are coated with sulfur/porous carbon composite material particles, a graphene conduction network is generated among the particles, and the obtained graphene-coated sulfur/porous carbon composite material is in a hierarchical core-shell structure; the positive electrode material has the high specific capacity, the long cycle life and the good rate capability; the composite positive electrode material can be used as a positive electrode material in a lithium secondary battery.

The preparation of functionalized reduced graphene oxide (RGO) composite materials on various fibrous substrates has been proposed. The functionalized RGO composite fibrous materials absorb various types of oils efficiently within 20 seconds, with great absorption capacity. The maximum absorption capacity values for bicycle chain oil and used motorcycle engine oil are 880.8% and 839.1%, respectively. Simply squeezing the functionalized RGO composite materials allows the removal of the absorbed oil for reuse. The functionalized RGO composite fibrous materials have been used to efficiently separate oil/water mixture through a flowing system. Having the advantages of faster absorption rate, reusability, and low-costs, the functionalized RGO composite fibrous materials holds great potential as a superabsorbent for efficient removal and recovery of oil spills, and for separation of water/oil mixtures.

The invention relates to the technical field of photocatalysis, and specifically relates to a graphene-based gamma-FeO2O3 composite material photocatalyst, and a preparation method and use thereof. According to the graphene-based gamma-FeO2O3 composite material photocatalyst, gamma-Fe2O3 particles are attached to the surface of graphene, size distribution of the graphene is 1-50 mu m and the size distribution of the gamma-Fe2O3 particles is 20-500nm. The preparation method mainly comprises the following steps: preparation of graphite oxide; preparation of a graphite oxide iron sulfate hydrate intercalating matter; and preparation of the graphene-based gamma-FeO2O3 composite material photocatalyst. The graphene-based gamma-FeO2O3 composite material photocatalyst prepared by the preparation method disclosed by the invention has high carrier transmission rate, large specific surface area and low energy gap, so that the photocatalyst has extremely high activity of photocatalytic degradation of organic matters. The photocatalytic activity of the photocatalyst disclosed by the invention is over 86% higher than that of pure gamma-FeO2O3 particles. The photocatalyst has good circular stability, can be repeatedly used for many times, and does not cause secondary pollution in the photocatalytic degradation process.

The invention discloses a light cement-based graphene oxide composite adsorption material. The light cement-based graphene oxide composite adsorption material comprises, by weight, 600-650 parts of silicate cement with a mark of 42.5, 10-18 parts of sand with the fineness of 2.5-2.8, 200-230 parts of water, 0.4-0.7 part of foaming agents and 200-240 parts of graphene oxide nanometer laminar dispersion liquid. The invention further discloses a method for preparing the light cement-based graphene oxide composite adsorption material. The light cement-based graphene oxide composite adsorption material and the method have the advantages that heavy metal ions such as Cr<3+>, Cr<6+>, Ni<2+>, Cu<2+>, Pb<2+>, Zn<2+>, As<5+> and Hg<2+> in wastewater can be adsorbed and removed by the light cement-based graphene oxide composite adsorption material, the removal rate can reach 98% at least, the light cement-based graphene oxide composite adsorption material is high in adsorption capacity, adsorption rate and selectivity and easy to separate and regenerate, and the like.

The invention relates to a method for controlling surface potentials of a graphene-based material by treating the graphene-based material via a chemical reagent. The graphene-based material with the different surface potentials can be prepared by controlling the type, the dosage, the reaction time, the reaction temperature and the like of the chemical reagent. The method comprises the following steps: dispersing graphite oxide into a solvent and performing ultrasonic stripping so as to prepare a graphene oxide dispersion liquid; adding an oxidizing agent, a reducing agent or the chemical reagent having specific functional groups (comprising solution thereof); performing water-bath refluxing and controlling the reaction time and the reaction temperature under a condition of magnetic stirring; performing centrifugal washing and drying on a product; and dispersing the product in the certain solvent and regulating a pH value, thereby obtaining the graphene-based material dispersion liquid with the certain surface potentials. The method is simple to operate and low in cost, and is suitable for preparing a large quantity of graphene-based functional materials with different activities and different functions (the different surface potentials).

The invention relates to a preparation method of a large-sized and high-heat-conductivity natural graphite radiating film. The preparation method includes the steps: taking natural flake graphite as araw material and preparing highly oxidized graphite extremely easy to clean by an improved oxidized graphite preparation method; dispersing the oxidized graphite in a solvent to prepare slurry; coating a substrate with the slurry; drying an obtained wet film, and demolding and winding the film; performing carbonization or hydroiodic acid reduction treatment; performing graphitization treatment and calendaring to obtain the high-heat-conductivity natural graphite radiating film. By the method, the low-cost natural graphite film which is 3-20 micrometers in thickness, 50-200 millimeters in width and more than 2 meters in length can be prepared quite simply, the in-plane heat conductivity of the prepared graphite film can reach 1460Wm<-1>K<-1>, and the electrical conductivity of the preparedgraphite film can reach 5700Scm<-1>.

The invention discloses an oxidation-resistant polymer film with memory function. The oxidation-resistant polymer film with memory function is prepared from carboxylated graphene oxide, nano silicon dioxide, modified kudzu root starch, nano silver, curcumin, proanthocyanidin, vinyl triguaiacyl trimethoxy silane, epoxy soybean oil, nitrile-butadiene rubber powder, tetramethylsilane, dodecylbenzene sulfonic acid, paraffin oil, meerschaum wool, metallocene polyethylene and a polypropylene random copolymer. The polymer film has the advantages of simple components, low cost, no toxicity, no corrosiveness, no impurity, bright surface, impact resistance and tear resistance, is non-combustible, has favorable service performance, and is green and environment-friendly. The polymer film has low ash content, and can enhance the electric properties and high cleanliness of capacitors. The polymer film has excellent heat resistance, is non-combustible, and has high electrochemical activity. The polymer film has high oxidation resistance and stable performance, and thus, can obviously enhance the user stability and service life of the capacitors. The polymer film has the characteristics of high mechanical properties, acid/alkali resistance, corrosion resistance and high recoverability.

The invention relates to a preparation method of an adsorption material for selectively adsorbing silver ions. The preparation method comprises the following steps: uniformly dispersing a chitosan-graphene oxide composite material in an acetic acid solution, adding 3-mercaptopropyltrimethoxysilane, uniformly stirring the obtained solution, adding a sodium hydroxide solution to adjust the pH value of the obtained system, adding a glutaraldehyde solution, stirring the solutions to obtain a uniformly mixed solution, standing the uniformly mixed solution at 3-4 DEG C for 20 h or more, and carrying out post-treatment to obtain the mercapto modified chitosan-graphene oxide composite material. The preparation method overcomes the shortcoming of difficulty selective adsorption of the silver ions from a complex environment of adsorption materials in the prior art. The adsorption material prepared in the invention has large adsorption capacity, can quickly selectively adsorb silver ions, and makes the silver ion adsorption balance time much shorter than the adsorption balance time in the prior art.

The invention discloses a graphene hybridized photocatalyst hydrogel, belonging to the field of nanometer materials. The graphene hybridized photocatalyst hydrogel is used for treatment of water pollution and prepared by using graphite oxide and a photocatalyst as raw materials through a reduction reaction and ultrasonic treatment. The graphene hybridized photocatalyst hydrogel provided by the invention can promote the dispersion of graphene oxide in water, avoids further aggregation of a nanoscale photocatalyst from generation in the process of hydrogel formation, can significantly improve the specific surface area and adsorption capacity, has more obvious three-dimensional cross-linked mesoporous microstructure, can realize the synergistic effect of adsorption enrichment and photocatalytic degradation, significantly reinforces the in-situ catalytic degradation ability of adsorbed and enriched pollutants, and can greatly improve the mineralization and removal efficiency of pollutants.

The invention discloses a preparation method of a high-activity waterproof soap-free emulsion polymer. Raw materials for polymerization comprise: 7 to 19 parts of an amide hydrophilic monomer; 6 to 17parts of a soap-free amide hydrophilic monomer; 0.28 to 0.85 part of a chain transfer agent; 0.21 to 0.49 part of an initiator a; 2.3 to 4.5 parts of an initiator b; 9-18 parts of a soap-free alkyl hydrophobic monomer, 202-267 parts of an alkyl hydrophobic monomer, 3.4-7.8 parts of a cross-linking agent, 2.4-6.7 parts of a flexible small monomer, 5-16 parts of a polyether, 0.4-0.9 part of a graphene oxide functional monomer, 3.2-8.6 parts of a pH regulator, 9-20 parts of a neutralizer and the balance of water, wherein the total amount of the raw materials is 1000 parts. According to the invention, amide monomers and alkyl monomers are used as raw materials; soap-free emulsion polymerization method is adopted to obtain a self-made soap-free polymer for water resistance; and the soap-free polymer is reacted with other raw materials to synthesize an emulsion polymer waterproof coating. According to the method, adverse effects caused by emulsifiers are eliminated, graphene oxide is addedto improve the film-forming property and the film-forming strength of the coating, the added cross-linking agent enhances the density and the hardness of formed film, the cohesiveness is enhanced, andthe waterproof capacity and the weather resistance are improved.

The invention discloses a preparation method of amination graphene oxide reinforced fibers. The preparation method has the advantages that amination graphene oxide is evenly dispersed in nylon 6, a strong binding effect is achieved, and the performance of the modified fibers is enhanced.

The invention provides a high-adsorption polylactic acid composite biofilm carrier material, which is prepared from the following raw materials by weight: 8-10 parts of diatomaceous earth, 14-18 partsof polylactic acid, 0.3-0.4 part of graphene oxide, 4-6 parts of cassava starch, 2-3 parts of gum arabic, 40-50 parts of polypropylene, 8-12 parts of chitosan, 2-4 parts of nanometer carbon sol, 3-5parts of lignocellulose, 1-2 parts of bentonite, 1-2 parts of hexadecyl trimethyl ammonium bromide, 0.5-1.5 parts of silica sol, 0.3-0.5 part of sodium humate, and 15-20 parts of water. The inventionfurther provides a preparation method of the high-adsorption polylactic acid composite biofilm carrier material. According to the present invention, the high-adsorption polylactic acid composite biofilm carrier material has advantages of light weight, large surface activation area, rich carbon source and low influence of environmental temperature change on adsorption performance; and the filler prepared from the high-adsorption polylactic acid composite biofilm carrier material has advantages of good fluidity, less agglomeration, good adsorption performance, corrosion resistance, duration, high efficiency and the like so as to further improve the water purification effect.

The invention discloses a preparation method of a SnS2 nanosheet loaded graphene-based nano composite material, which comprises the following steps: step 1, dispersing graphene oxide nanosheets in deionized water to prepare a graphene oxide solution; 2, dissolving tin tetrachloride in deionized water, and adding thiourea as a sulfur source and a reducing agent; 3, adding the graphene oxide solution in the step 1 into the solution obtained in the step 2, and carrying out mixing treatment through ultrasonic waves and transferring a mixture of the two solutions subjected to ultrasonic treatment into a hydrothermal reaction kettle for reaction to obtain a precipitate; and 4, centrifuging, washing, drying and grinding the precipitate obtained by the reaction in the step 3 to obtain the graphene nanosheet/tin disulfide composite nanomaterial. The graphene nanosheet/tin disulfide composite nanomaterial prepared by the method has higher capacity and stability when being used as a sodium storage electrode material.

The invention discloses a composite cathode of a microbial fuel cell and a preparation method thereof. The composite cathode in turn comprises a catalytic layer, a carbon cloth layer, a carbon base layer and a diffusion layer from one side to the other side; and the material of the catalytic layer is a mixture of a graphene oxide / magnesium oxide composite material, activated carbon and perfluorinated sulfonic acid. The composite cathode of the microbial fuel cell is prepared from the magnesium oxide / graphene oxide composite material. Compared with noble metal platinum and alloy materials thereof, the raw materials of the composite cathode of the microbial fuel cell are wide in source and low in price, and the prepared composite cathode has a large surface area, excellent conductivity and stable electronic migration, can be used in microbial fuel cells, has low cost, stable operation and high output power, and can be widely used in the microbial fuel cells, lithium batteries or super capacitors.

The invention discloses a novel method for preparing a recyclable graphene composite titanium dioxide nano material. The preparation method is characterized by comprising the following steps of: firstly, preparing nickel ferrite by a hydrothermal method, preparing graphite oxide by a Hummers method, and synthesizing the nickel ferrite, graphene and titanium dioxide into the composite material by ahydrothermal method in one step. The preparation process is easy to operate, reaction conditions are easy to control, the requirement for equipment is low, the loss is low, high-temperature calcination is not needed, the synthesis cost is reduced, good market prospects are achieved, and the prepared composite material has excellent photocatalytic performance, has magnetism, is convenient to recycle, can be repeatedly used and improves economic benefits.

The invention discloses a preparation method of a high-dielectric-performance polymer-based composite microporous material. The preparation method concretely comprises the following processes of preparing a gamma-aminopropyltriethoxysilane modified multiwalled carbon nanotube water dispersion solution; using an improved Hummers method for preparing GO; dispersing the obtained GO into deionized water; performing ultrasonic dispersion to obtain a negatively charged GO water dispersion solution; preparing oxidized graphene coated multiwalled carbon nanotube solid powder; preparing polyetherimide/oxidized graphene coated multiwalled carbon nanotube composite sheet materials; preparing a composite material/CO2 mixed sheet material; taking out the composite material/CO2 mixed sheet material; transferring the material into a constant temperature silicon oil bath to be foamed at the foaming temperature being 180 to 220 DEG C for the foaming time of 5 to 60s; finally putting the materials intoan ice water bath to be cooled and shaped to obtain a finished product. The supercritical CO2 fluid is used as a physical foaming agent for introducing microporous structures into the composite material, so that the carbon nanometer material is oriented again to form a great amount of micro capacitance to improve the dielectric performance.

The invention discloses a polyacrylate grafted graphene oxide plugging agent and an oil-based drilling fluid. A plugging agent used by the oil-based drilling fluid is polyacrylate grafted graphene oxide, and the polyacrylate grafted graphene oxide plugging agent is prepared from the following synthetic raw materials: graphene oxide, an amino silane compound, an acrylate compound and an acrylamide compound. The drilling fluid comprises the polyacrylate grafted graphene oxide blocking agent disclosed by the invention. The polyacrylate grafted graphene oxide is used as a blocking agent, the particle size of the polyacrylate grafted graphene oxide is approximately distributed between 60 nm and 1200 nm, nano apertures in a shale stratum can be effectively blocked, and therefore the well wall can be effectively stabilized, and collapse can be prevented; the plugging agent has small influence on the performance of the drilling fluid and is beneficial to reducing the filter loss of the drilling fluid, and the oil-based drilling fluid used by the plugging agent has good rheological property, water loss wall-building property, plugging property and the like under the shale formation condition.

The invention provides a reduced graphene/alpha-Fe2O3 supercapacitor material and a preparation method and application thereof. The preparation method of the reduced graphene/alpha-Fe2O3 supercapacitor material comprises the following steps: (1) dissolving Fe (NO3) 3.9H2O, CTAB, urea and graphene oxide dispersion in a methanol solution and performing hydrothermal reaction at 160-200 DEG C for 8-24h; (2) pumping and filtering the reaction product obtained in the step (1), adding the obtained solid and thiourea into water, uniformly mixing and transferring to a reaction kettle and performing hydrothermal reaction at 160-200 DEG C for 8-24 hours; and (3) pumping and filtering the product obtained in the step (2), freezing and drying and then performing heat treatment. The supercapacitor material is simple in preparation of the working electrode, and the electrochemical working window in the alkaline electrolyte is from -1.05 V to -0.3 V and the maximum specific capacity can be 1296 F/g so as to be an ideal negative electrode material. The shortcoming of low specific capacity of the negative electrode material of the supercapacitor can be overcome, the problem of mismatch between thepositive electrode and negative electrode specific capacity of the supercapacitor can be solved and thus the material has high research value.

The invention discloses silica gel pad printing conductive ink, which comprises the following components in parts by weight: 75-100 parts of cyclic methyl polysiloxane resin, 5-10 parts of silicon dioxide extinction powder, 5-10 parts of hydrogen-containing silicone oil, 0.5-10 parts of graphene oxide slurry, 10-25 parts of an organic solvent, 0.3-5 parts of a platinum catalyst and 1-20 parts of temperature change powder. The silica gel pad printing conductive ink is low in cost, waste finished products do not pollute the environment, and a large amount of silica gel pad printing conductive ink can be recycled to serve as building heat insulation filler.

The invention relates to a particle size variable anti-tumor bionic nano preparation based on PLGA, the bionic nano preparation comprises PLGA, bufalin (CS-6), photosensitizer chlorine e6 modified PEGylated graphene oxide quantum dots (GC) and a bionic hybrid membrane (HM), the photosensitizer chlorine e6 (Ce6) is modified on the surfaces of the PEGylated graphene oxide quantum dots, the bufalin (CS-6) and the chlorine modified PEGylated graphene oxide quantum dots (GC) are embdded in PLGA, bionic nano preparation (GCCS-6-coated PLGA [HM]) is synthesized, and a bionic hybrid membrane (HM) is camouflaged on the outer layer of the nano preparation (GCCS-6-coated PLGA) to synthesize the bionic nano preparation (GCCS-6-coated PLGA [HM]). The invention also provides a preparation method for preparing the bionic nano preparation. The bionic nano preparation has excellent tumor infiltration capacity, shows good triple-negative breast cancer resisting effect and invasion and metastasis inhibiting capacity, and can be used as a light/chemotherapy combined treatment bionic nano preparation for triple-negative breast cancer.

The invention provides a method for preparing iron-cobalt-nitrogen codoped graphene at a low temperature. According to the method, graphene oxide, guanidine phosphate, ferric salt and cobalt salt are utilized to prepare the iron-cobalt-nitrogen codoped graphene at a low temperature, compared with the method for preparing metal nitrogen codoped graphene at a high temperature and high pressure, the method for preparing iron-cobalt-nitrogen codoped graphene at a low temperature by utilizing the graphene oxide, the guanidine phosphate, the ferric salt and the cobalt salt has the advantages of reducing the requirement for the operation equipment, decreasing the destroy for the graphene structure and being efficient and simple. The method for preparing iron-cobalt-nitrogen doped graphene at a low temperature has important value and application in the aspect of reduction reaction of catalytic oxygen.

The invention discloses a preparation method of a graphene modified polyurethane adhesive, and the method comprises the following steps: uniformly dispersing 0.5-1 part by weight of graphene oxide in10 parts by weight of absolute ethyl alcohol, and reacting with 20 parts by weight of polyisocyanate to obtain a polyisocyanate-graphene oxide mixed solution; reacting 25 parts of triethanolamine, 30parts of sodium hydroxyethyl sulfonate, 33 parts of n-decane and 0.5 part of metallic sodium to obtain sulfonated dihydric alcohol; adding 8 parts of absolute ethyl alcohol, dissolving, and carrying out reduced pressure distillation to obtain sulfonic acid group-containing dihydric alcohol; and carrying out reduced pressure distillation on 60 parts of polyester polyol and 10 parts of the sulfonicacid group-containing dihydric alcohol, reacting with the polyisocyanate-graphene oxide mixed solution, and adding a thickening agent and a defoaming agent into the reactant subjected to chain extension to obtain the graphene modified polyurethane water-based adhesive. The adhesive is high in graphene content, good in dispersity, not prone to agglomeration, environmentally friendly and resistant to bacteria, and the use performance and the storage stability of the adhesive are greatly improved.