▎ 摘　　要

NOVELTY - Preparing hydroxylated graphene comprises (i) adding concentrated sulfuric acid into crystalline flake graphite powder, respectively adding strong oxidant sodium peroxide, sodium nitrate and phosphorus pentoxide at 0-10 degrees C, stirring for 2-3 hours, adding water and stirring for 1-2 hours, controlling temperature at 80-95 degrees C, centrifuging, washing with water and drying to obtain graphene oxide powder, and (ii) transferring graphene oxide powder into a constant temperature chamber filled with mixed gas of inert gas and nitrogen in volume ratio of 1:1 and controlling the reaction temperature and processing time. USE - The method is useful for preparing hydroxylated graphene. ADVANTAGE - The method: is safe, environmentally friendly and easy to operate; has short reaction time consumption; and produces product which does not contain other oxygen-containing functional groups.