▎ 摘　　要

NOVELTY - Preparation of graphene oxide comprises reacting graphite, acid solution and hydrogen peroxide at 75-85 degrees C for 25-45 minutes to obtain acid intercalated graphite, mixing concentrated sulfuric acid with acid intercalated graphite, adding strong oxidant, reacting and removing acid. The acid solution comprises concentrated sulfuric acid, phosphoric acid and/or phosphorus pentoxide. The mass ratio of strong oxidant to graphite is 3. USE - The method is for preparation of graphene oxide. ADVANTAGE - The method does not introduce nitrate ion in the whole process of intercalation and oxidation and reduces risk of explosion.