▎ 摘　　要

NOVELTY - Preparing graphene by weak oxide intercalation stripping method comprises: (i) adding flake graphite into concentrated sulfuric acid or fuming sulfuric acid, adding ferric oxide or ferric oxalate, adding hydrochloric acid as catalyst, dissolving to obtain a mixed solution; (ii) passing a mixed gas into the mixed solution and reacting to obtain a reaction solution-A; (iii) reacting the reaction solution-A in a water bath to obtain a reaction solution-B; (iv) diluting the reaction solution-B, performing sedimentation and dialysis; and (v) dispersing the agglomerated graphene oxide. USE - The method is useful for preparing graphene by weak oxide intercalation stripping method. ADVANTAGE - The method utilizes economical intercalation agent, has high reaction efficiency and suitable for industrial production. DETAILED DESCRIPTION - Preparing graphene by weak oxide intercalation stripping method comprises: (i) adding flake graphite into concentrated sulfuric acid or fuming sulfuric acid, adding ferric oxide or ferric oxalate into the concentrated sulfuric acid or fuming sulfuric acid at room temperature, adding 5% hydrochloric acid as catalyst, stirring and dissolving to obtain a mixed solution, where the volume-mass ratio of concentrated sulfuric acid or fuming sulfuric acid and flake graphite is (20-40)ml: 1g, the mass ratio of ferric oxide or ferric oxalate with flake graphite is 3:1; (ii) passing a mixed gas into the mixed solution and reacting under water bath at 0-25 degrees C for 0.5-2 hours under stirring condition to obtain a reaction solution-A; (iii) reacting the reaction solution-A in a water bath under stirring condition at 30-80 degrees C, drop-wisely adding deionized water into the reaction solution, reacting at 98 degrees C for 15 minutes to obtain a reaction solution-B, where the mixed gas in step (ii) and (iii) is ozone-air or ozone-oxygen, the volume percentage of ozone in the mixed gas is 0.5-10 vol.%; (iv) diluting the reaction solution-B, performing sedimentation and dialysis to remove residual metal ions and to obtain agglomerated graphene oxide; and (v) dispersing the agglomerated graphene oxide by stirring at 10000 rotations/minute for 20-120 minutes or via ultrasound at 1000 W for 20-120 minutes to obtain stripped and dispersed graphene oxide.