Abstract: The invention relates to a preparation method of graphene using graphene oxide. The method consists of the following steps. (1). Preparation of graphene oxide-dispersant solution; (2). Reduction of graphene oxide; (3). Obtaining graphene by suction filtration and drying process. Based on the preparation of anthracite, the invention could reduce production costs effectively comparing to traditional preparation methods of graphene, and make the reaction more fast and complete, facilitating the achievement of large scale industrial production.

Abstract: The present invention relates to a preparation method of graphene oxide based on anthracite. The method consists of the following steps. a. Preparation of ultra-clean anthracite powder; b. Pretreatment of ultra-clean anthracite powder; c. Preparation of anthracite oxide dispersion; d. Preparation of graphene oxide colloid solution; e. Preparation of graphene oxide. The invention also relates to a preparation method of graphene using graphene oxide obtained by method mentioned before. The method consists of the following steps. f. Preparation of graphene oxide-dispersant solution; g. Reduction of graphene oxide; h. Obtaining graphene by suction filtration and drying process. Based on the preparation of anthracite, the invention could reduce production costs effectively comparing to traditional preparation methods of graphene and graphene oxide, and make the reaction more fast and complete, facilitating the achievement of large scale industrial production.

Abstract: The invention relates to a preparation method of graphene using graphene oxide. The method consists of the following steps. (1). Preparation of graphene oxide-dispersant solution; (2). Reduction of graphene oxide; (3). Obtaining graphene by suction filtration and drying process. Based on the preparation of anthracite, the invention could reduce production costs effectively comparing to traditional preparation methods of graphene, and make the reaction more fast and complete, facilitating the achievement of large scale industrial production.

Abstract: A method for preparing graphene quantum dots in large-scale, comprising: dispersing graphene oxide uniformly in the first solvent to obtain a first dispersion liquid, adding reducing agent into the first dispersion liquid and dispersing uniformly to give a mixed solution; treating the mixed solution for 10˜60 mins under microwave environment with the power being at 500˜800 W, then cooling and separating to obtain the solid as a crude product; mixing, one of the reducing polyhydroxy aldehyde or organic acid with the crude product, following by adding the Lewis acid to obtain a mixture, dispersing the mixture in a second solvent uniformly to obtain a second dispersion liquid; putting wherein the second dispersion liquid into microwave treatment for 0.2-1 hours with the microwave power being 500˜800 w, then stripping for 2˜3 hours under ultrasonic power of 120˜300 w, purifying to obtain the graphene quantum dots.

Abstract: A method for repairing a reduced graphene oxide, the method comprising the following steps: Dispersing the reduced graphene oxide into a solvent to obtain a graphene dispersion liquid, adding a first Lewis acid and a compound containing a methyl or methylene group to obtain the first mixture, reacting the first mixture in a microwave environment of which power is 300˜900 w for 0.5˜2 hours, refluxing for 3˜5 hours; separating, purifying and drying to obtain the first crude product; adding the first crude product into a second Lewis acid, adding an aromatic hydrocarbon repairing agent to obtain the second mixture, reacting the second mixture to obtain a molten solid, separating and purifying same to obtain the second crude product; mixing the second crude product, a metal powder catalyst and a third Lewis acid to obtain the third mixture, this method can repair reduced graphene oxide effectively.

Abstract: The present invention relates to a preparation method of graphene oxide based on mixed acid system. The method consists of the following steps. a. Preparation of graphite powder; b. Preparation of suspension liquid of first acid system; c. Preparation of second acid system; d. Preparation of graphene oxide. The invention also relates to a preparation method of graphene using graphene oxide obtained by method mentioned above. The method consists of the following steps. e. Preparation of graphene oxide-dispersant solution; f. Reduction of graphene oxide; g. Process of supersonic stripping; h. Obtaining graphene by separation and drying. The preparation methods of graphene oxide and graphene in our invention could reduce the dosage of strong acid as well as heat release of chemical reaction, and cause less corrosion to our equipments, which makes the reaction more effective and properties of graphene products better, facilitating the achievement of large scale industrial production.

Abstract: The present invention relates to a preparation method of graphene oxide based on anthracite. The method consists of the following steps. a. Preparation of ultra-clean anthracite powder; b. Pretreatment of ultra-clean anthracite powder; c. Preparation of anthracite oxide dispersion; d. Preparation of graphene oxide colloid solution; e. Preparation of graphene oxide. The invention also relates to a preparation method of graphene using graphene oxide obtained by method mentioned before. The method consists of the following steps. f. Preparation of graphene oxide-dispersant solution; g. Reduction of graphene oxide; h. Obtaining graphene by suction filtration and drying process.

Abstract: A method for repairing a reduced graphene oxide, the method comprising the following steps: Dispersing the reduced graphene oxide into a solvent to obtain graphene dispersion liquid, adding a first Lewis acid and a compound containing a methyl or methylene group to obtain the first mixture, reacting the first mixture in a microwave environment of which power is 300˜900 w for 0.5˜2 hours, refluxing for 3˜5 hours; separating, purifying and drying to obtain the first crude product; adding the first crude product into a second Lewis acid, adding an aromatic hydrocarbon repairing agent to obtain the second mixture, reacting the second mixture to obtain a molten solid, separating and purifying same to obtain the second crude product; mixing the second crude product, a metal powder catalyst and a third Lewis acid to obtain the third mixture, this method can repair reduced graphene oxide effectively.

Abstract: A method for preparing graphene quantum dots in large-scale, comprising: dispersing graphene oxide uniformly in the first solvent to obtain a first dispersion liquid, adding reducing agent into the first dispersion liquid and dispersing uniformly to give a mixed solution; treating the mixed solution for 10˜60 mins under microwave environment with the power being at 500˜800 W, then cooling and separating to obtain the solid as a crude product; mixing, one of the reducing polyhydroxy aldehyde or organic acid with the crude product, following by adding the Lewis acid to obtain a mixture, dispersing the mixture in a second solvent uniformly to obtain a second dispersion liquid; putting wherein the second dispersion liquid into microwave treatment for 0.2-1 hours with the microwave power being 500˜800 w, then stripping for 2˜3 hours under ultrasonic power of 120˜300 w, purifying to obtain the graphene quantum dots.

Abstract: The present invention relates to a preparation method of graphene oxide based on mixed acid system. The method consists of the following steps. a. Preparation of graphite powder; b. Preparation of suspension liquid of first acid system; c. Preparation of second acid system; d. Preparation of graphene oxide. The invention also relates to a preparation method of graphene using graphene oxide obtained by method mentioned above. The method consists of the following steps. e. Preparation of graphene oxide-dispersant solution; f. Reduction of graphene oxide; g. Process of supersonic stripping; h. Obtaining graphene by separation and drying. The preparation methods of graphene oxide and graphene in our invention could reduce the dosage of strong acid as well as heat release of chemical reaction, and cause less corrosion to our equipments, which makes the reaction more effective and properties of graphene products better, facilitating the achievement of large scale industrial production.