▎ 摘　　要

NOVELTY - Preparing graphene oxide, comprises (i) taking sulfuric acid as solvent, and fuming nitric acid or nitrate as oxidant; (ii) performing oxidation of graphite, adding potassium permanganate in an amount of 6-24 times, and peeling graphite at 20-45 degrees C; and (iii) carrying out primary quenching by washing the reaction system with water, where the mass ratio of graphite and water is 1:50-1:87, and adding 30 wt.% hydrogen peroxide aqueous solution to carry out deep quenching reaction, where the mass ratio of hydrogen peroxide aqueous solution and graphite is 3:4-9:2 to obtain the product. USE - The method is useful for preparing graphene oxide (claimed). ADVANTAGE - The method is simple, carried out under low temperature conditions, and suitable for mass production; and has easily controls the reaction condition. The product has stable quality, and particles with uniform diameter size, and consistency; does not contain adhered substances; and is easy to disperse. DETAILED DESCRIPTION - Preparing graphene oxide, comprises (i) taking 98% sulfuric acid as a solvent, and 86% fuming nitric acid or nitrate as an oxidant, where the mass ratio of graphite and sulfuric acid is 1:75-2:225, and the mass ratio of graphite and nitrate is 3:1-1:2; (ii) carrying out primary oxidation of graphite, adding potassium permanganate in an amount of 6-24 times, where the mass ratio of graphite and potassium permanganate is 5:1-1:3, and completing deep oxidation of graphite, and peeling graphite at 20-45 degrees C; and (iii) carrying out primary quenching by washing the reaction system with water, where the mass ratio of graphite and water is 1:50-1:87, and adding 30 wt.% hydrogen peroxide aqueous solution to carry out deep quenching reaction, where the mass ratio of hydrogen peroxide aqueous solution and graphite is 3:4-9:2 to obtain the product.