▎ 摘　　要

NOVELTY - Method for preparing graphene oxide dispersion involves (i) adding high-purity flake graphite and sodium nitrate to concentrated sulfuric acid, refrigerating at 0 degrees C, stirring and maintaining at 0 degrees C for a period of time, (ii) slowly adding potassium permanganate, maintaining the temperature at 0-5 degrees C during the process of adding potassium permanganate, and continuing to stir for a period of time, (iii) heating at 30-50 degrees C and continuing to stir for a period of time, (iv) stop heating and continuously stirring, slowly adding deionized water, and controlling the temperature of the system below 90 degrees C, (v) adding 30 %mass hydrogen peroxide under the condition that the temperature of the control system not greater than 80 degrees C, and taking out after stirring for 5-20 minutes, and (vi) washing and separating the graphene oxide, measuring the graphene oxide content in the water, and adding metered amount of pure water to prepare the product with a certain concentration. USE - The method is useful for preparing graphene oxide dispersion. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the graphene oxide dispersion liquid, where the graphene oxide sheet diameter contained in the graphene oxide dispersion liquid is 400-1200 nm, the single-layer rate is more than 90%, and the purity is more than 99%.