▎ 摘　　要

NOVELTY - Manufacture of graphene oxide involves heating graphite powder and concentrated sulfuric acid at low temperature, adding potassium permanganate, reacting, adding water, reacting at high temperature, adding hydrogen peroxide solution, obtaining bright yellow solution, filtering, washing the filter cake, adding aqueous hydrochloride solution, drying the obtained solid, putting dried solid into water, stirring, dialyzing, and removing substrate by centrifuging. USE - Manufacture of graphene oxide (claimed). ADVANTAGE - The method enables efficient manufacture of stably dispersed solution of graphene oxide. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method of processing of graphene oxide waste liquid, which involves diluting the filtrate obtained during manufacture of graphene oxide, adjusting pH to 10, aging, precipitating, separating clear liquid, and obtaining precipitate of manganese.