▎ 摘　　要

NOVELTY - Purifying graphene oxide involves preparing a graphene oxide filter cake by improving the Hummers method, dissolving citric acid, salicylic acid, malic acid and tartaric acid in deionized water to obtain a mixed acid solution, and adding the graphene oxide filter cake into the mixed acid solution, and dispersing uniformly to obtain a graphene oxide dispersion, suction-filtering the graphene oxide dispersion various times until the pH of the supernatant is 5-6, and drying to obtain purified graphene oxide. USE - Method for purifying graphene oxide. ADVANTAGE - The method uses a mixed acid solution containing citric acid, salicylic acid, malic acid and tartaric acid as a solvent, which can effectively disperse the graphene oxide filter cake uniformly, avoiding the gelation caused by the increase of the viscosity of graphene oxide is beneficial to solid-liquid separation, greatly improving the cleaning and purification efficiency of graphene oxide, and avoiding the introduction of impurity ions such as chlorine (Cl) and sodium ions (Na+), invention has simple process, low cost, high purification efficiency and avoids introducing other impurity ions.