▎ 摘　　要

NOVELTY - Preparing high-quality graphene comprises (i) ultrasonically mixing concentrated sulfuric acid and peroxyacetic acid in a volume ratio of 1-20:1-10 to obtain a mixed solution; and (ii) adding 0.05-0.5 g graphite/5 ml of mixed solution, stirring uniformly, allowing to stand at room temperature for 1-12 hours, washing to neutral and drying. USE - The method is useful for preparing high-quality graphene. ADVANTAGE - The method: is simple and suitable for large-scale industrial production; realizes operation at room temperature and does not require high temperature or radiation conditions; and saves energy and reduces labor intensity.