▎ 摘　　要

NOVELTY - Preparing single layer graphene oxide aqueous solution comprises (i) adding crystalline flake graphite and concentrated sulfuric acid into flask under ice bath conditions, adding sodium nitrate, adding 6-600 g potassium permanganate, controlling the temperature not to exceed 10-15 degrees C,, and reacting, (ii) reacting in a 36-50 degrees C water bath, and the solution becomes viscous dark green, (iii) slowly adding 0.1-10 l water, reacting in a water bath, at which time the solution turns brownish yellow, and diluting with warm water, (iv) adding hydrogen peroxide into the system and reacting, (v) adding hydrochloric acid into the system, centrifuging, removing the supernatant, and washing, (vi) washing the solution to prepare solution of 1.0-50 l, and ultrasonicating, and (vii) centrifuging the supernatant liquid. USE - The aqueous solution is useful for electrochemically depositing a single layer of graphene oxide on the surface of the aluminum alloy (claimed). ADVANTAGE - The aqueous solution has high degree of oxidation, short preparation time and can be preserved for two years without precipitation. DETAILED DESCRIPTION - Preparing single layer graphene oxide aqueous solution comprises (i) adding 2-200 g crystalline flake graphite and 46-4600 ml concentrated sulfuric acid into flask under ice bath conditions, adding 1-100 g sodium nitrate, after half an hour, slowly adding 6-600 g potassium permanganate, controlling the temperature not to exceed 10-15 degrees C, controlling the feeding time within 2-3 hours, and reacting for half an hour, (ii) reacting in a 36-50 degrees C water bath for 0.5-1.5 hours, and the solution becomes viscous dark green, (iii) slowly adding 0.1-10 l water, reacting in a water bath of 92-98 degrees C for half an hour, at which time the solution turns brownish yellow, and diluting with warm water to 0.195-27.2 l, (iv) adding 5-1000 ml hydrogen peroxide into the system and reacting at 80 degrees C for half an hour and the solution is golden yellow, (v) adding 0.2-60 l 5% hydrochloric acid into the system, centrifuging at 4000-8000 rotations/minute, removing the supernatant, and washing it four times with water to remove the impurity salts in the system, (vi) washing the solution to prepare solution of 1.0-50 l, and ultrasonicating with a power of 80 Hz for 5-10 minutes, and (vii) centrifuging the supernatant liquid at 6000-8000 rotations/minute for 5-10 minutes to remove the impurity precipitate.