▎ 摘　　要

NOVELTY - The preparation method of graphene oxide using expanded graphite involves reacting concentrated sulfuric acid and concentrated nitric acid with graphite to obtain graphite intercalation compound, microwave reacting to obtain expanded graphite, reacting with strong acid to obtain pre-oxidized graphite, and adding diluent to obtain graphene oxide dispersion. USE - Preparation of graphene oxide using expanded graphite (claimed). ADVANTAGE - The environmentally-friendly method enables the preparation of graphene oxide using expanded graphite in large-scale, and effectively reduces the strong acid waste liquid.