▎ 摘　　要

NOVELTY - Preparation of graphene involves (A) puffing a graphene oxide into a dispersant to obtain graphene oxide-dispersant solution, (B) heating the solution in a microwave oven, (C) subjecting the solution to a supersonic treatment, and (D) subjecting the solution to suction filtration, and (E) drying. The mass ratio of the reducing agent and the graphene oxide is 1:1-5. The dispersant is selected from deionized water, inorganic acid, and/or high boiling solvent. The reducing agent is selected from electronic amine solution, hydrazine hydrate, sodium thiosulfate and/or phosphite ester. USE - Preparation of graphene e.g. crystalline graphite flakes using graphene oxide. ADVANTAGE - The method is rapid and economical, and efficiently produces graphene with high quality. DETAILED DESCRIPTION - Preparation of graphene involves (A) puffing a graphene oxide into a dispersant to obtain 0.1-1 g/ml graphene oxide-dispersant solution, (B) heating the graphene oxide-dispersant solution in a microwave oven operated at 900 W for 5-20 minutes, or adding a reducing agent into the graphene oxide-dispersant solution to obtain a mixture, and refluxing the mixture for 1 hour, (C) subjecting the graphene oxide-dispersant solution to a supersonic treatment carried out at a supersonic power of 100-300 W for 0.5-3 hours, and (D) subjecting the graphene oxide-dispersant solution to suction filtration, after supersonic treatment, and (E) drying. The mass ratio of the reducing agent and the graphene oxide is 1:1-5. The dispersant is one or more selected from deionized water, inorganic acid, surfactant solution, and high boiling solvent. The reducing agent is one or more selected from 1 %mass electronic amine solution, 80 %mass hydrazine hydrate, sodium thiosulfate, united dithionite and phosphite ester.