▎ 摘　　要

NOVELTY - Graphite powder is pretreated by adding graphite powder into container containing acidic ionic liquid, performing ultrasonic shock pretreatment, and uniformly mixing graphite mixed with acidic ionic liquid. To the resulted product mixture containing acid and potassium permanganate is added, maintained in water bath, subjected to ultrasonic vibration, and oxygen is absorbed by acidic ionic liquid. The product is stirred, heat-treated, and centrifuged, to obtain precipitate. The precipitate is washed, and resulted product is dried, to obtain graphene oxide. USE - Preparation of graphene oxide (claimed). ADVANTAGE - The method enables preparation of graphene oxide having high dispersibility by economical and environmentally-friendly method. DETAILED DESCRIPTION - Graphite powder is pretreated by adding graphite powder into container containing acidic ionic liquid, performing ultrasonic shock pretreatment, and uniformly mixing graphite mixed with acidic ionic liquid. To the resulted product mixture containing acid and potassium permanganate is added, maintained placing in water bath, subjected to ultrasonic vibration while stripping graphene produced by reaction, and oxygen is absorbed by acidic ionic liquid from bottom of vessel. The resulted product is stirred, heat-treated, and centrifuged, to obtain precipitate. The precipitate is washed with dilute hydrochloric acid solution and deionized water until filtrate is free of sulfate, and resulted product is subjected to vacuum freeze-drying, to obtain graphene oxide.