▎ 摘　　要

NOVELTY - Preparation of graphene comprises taking graphite powder and carboxylation agent, grinding and sieving, where average particle diameter of graphite powder is 200-500 mu m and average particle size of carboxylation agent is 50-300 mu m; mixing graphite powder and carboxylation agent at weight ratio of 1:1-1:2, ball milling, adding deionized water as solvent, and milling at 300-1000 revolutions/minute for 12-36 hours; centrifuging, taking supernatant fluid, filtering, repeatedly washing with deionized water until neutral, vacuum drying solid, and grinding; and microwave heating. USE - Method for preparing graphene (claimed). ADVANTAGE - The graphene has high purity. The method has low cost and is simple, environment-friendly, and convenient. DETAILED DESCRIPTION - Preparation of graphene comprises: (A) taking graphite powder and carboxylation agent, grinding and sieving, where average particle diameter of graphite powder is 200-500 mu m and average particle size of carboxylation agent is 50-300 mu m; (B) mixing graphite powder and carboxylation agent at weight ratio of 1:1-1:2, ball milling, adding deionized water as solvent, and milling at 300-1000 revolutions/minute for 12-36 hours; (C) centrifuging, taking supernatant fluid, filtering, repeatedly washing with deionized water until neutral, vacuum drying solid at 80-100 degrees C for 2-5 hours, and grinding; and (D) microwave heating for 5-10 minutes.