▎ 摘　　要

NOVELTY - Preparing hydroxylated graphene comprises e.g. (i) preparing oxidized graphite, (ii) treating graphene oxide prepared in step (i) with high-power ultrasonic stripping apparatus to obtain graphene oxide, then subjecting liquid crystal to low-temperature supercritical pressure peeling and graphene stereotypes, under a vacuum of 5 Pa and freeze-drying to obtain graphene oxide powder, and (iii) transferring graphene oxide powder obtained in step (ii) to a constant temperature chamber filled with mixed gas of inert gas and nitrogen, then controlling the reaction temperature and treatment time. USE - The method is useful for preparing hydroxylated graphene (claimed). ADVANTAGE - The method: has simple preparation process and short processing time; and the product is environmentally friendly. DETAILED DESCRIPTION - Preparing hydroxylated graphene comprises (i) preparing oxidized graphite by chemical method to obtain oxidized graphite, (ii) treating graphene oxide prepared in step (i) with high-power ultrasonic stripping apparatus to obtain graphene oxide, then subjecting liquid crystal to low-temperature supercritical pressure peeling and graphene stereotypes, under a vacuum of 5 Pa and freeze-drying for 72 hours to obtain graphene oxide powder, and (iii) transferring graphene oxide powder obtained in step (ii) to a constant temperature chamber filled with mixed gas of inert gas and nitrogen in a volume ratio of 1:1, then controlling the reaction temperature and treatment time to obtain high-purity hydroxylated graphene.