▎ 摘　　要

NOVELTY - Preparing oxidized graphene by hydrothermal assisted reaction system comprises mixing concentrated sulfuric acid, potassium permanganate, and expanded graphite as reaction materials, cooling the reaction material at less than 5 degrees C, and performing hydrothermal assisted reaction to achieve oxidative-exfoliation to obtain graphene oxide with excellent two-dimensional nanosheet structure. USE - The method is useful for preparing oxidized graphene by hydrothermal assisted reaction system. ADVANTAGE - The method: improves the peeling efficiency of graphite; is simple and safe; has low-cost hydrothermal assisted method; and produces oxidized graphene with high efficiency.