▎ 摘　　要

NOVELTY - Graphite powder and sulfuric acid are stirred in a reaction kettle. Potassium permanganate is added, and the solution is heated. Distilled water is added, followed by addition of hydrogen peroxide solution to obtain a yellow solution of oxidized graphite slurry. The slurry is washed and dried. Potassium hydroxide is added to adjust the pH, stirred, washed with deionized water, and dried. Graphene is reduced to obtain graphene oxide sample, heating under protection of argon, hydrogen or ammonia, to obtain a graphene sample of 1-5 atomic layer thickness. USE - Preparation of waste recovery graphite powder in graphene. ADVANTAGE - The method enables economical and quick mass-production of graphene with high yield, by using a simple device which can be controlled easily. The utilization rate of resource is improved. DETAILED DESCRIPTION - Graphite powder (1 g) and 98% concentrated sulfuric acid (20-100 ml) are uniformly stirred in a reaction kettle. Potassium permanganate (3-6 g) is added very slowly to the reaction kettle, fully stirred, and maintained at 20 degrees C or less in a cooler (ice bath or circulating cooler). The solution is then heated to 35 plus minus 5 degrees C and maintained for 30-90 minutes. Distilled water is added to make the reaction temperature of the solution 80-90 degrees C, which is maintained for 15-30 minutes. 30% Hydrogen peroxide solution is added to the reaction kettle to obtain a yellow solution of oxidized graphite slurry. The slurry is washed and dried with 5-10% hydrochloric acid repeatedly. Potassium hydroxide is added to adjust the pH to 9-10, fully stirred, washed with deionized water to remove redundant ions, and dried. Graphene is reduced to obtain graphene oxide sample in a high-temperature furnace, heating under protection of argon, hydrogen or ammonia to 500-800 degrees C and maintaining for 1-3 hours, to obtain a graphene sample of 1-5 atomic layer thickness.