▎ 摘　　要

NOVELTY - Method for preparing graphene oxide involves (i) uniformly mixing graphite and an aqueous solution, adjusting the pH value of the system, and heating to obtain an acidic mixture, (ii) adding Fenton reagent and aqueous solution after cooling the acidic mixture, and reacting to obtain a graphite oxide solution, (iii) centrifuging, and washing the graphite oxide solution to neutral, and (iv) diluting the solution obtained in step (iii), ultrasonically processing, and freeze-drying. USE - The method is useful for preparing graphene oxide. ADVANTAGE - The method enables preparation of graphene oxide with mild condition and high single-layer rate, by simple and environmentally-friendly process.