▎ 摘　　要

NOVELTY - Preparing oxidized graphene by recycling acid involves obtaining the waste acid filtrate produced by preparing graphene oxide. The waste acid filtrate is evaporated, concentrated and demineralized to obtain recovered acid. The graphene oxide is prepared by using recycled acid instead of concentrated sulfuric acid. USE - Method for preparing oxidized graphene by recycling acid. ADVANTAGE - The method uses pure recycling acid recycling to prepare graphene oxide slurry by filtering the obtained filter liquid by evaporating, concentrating, cooling and removing salt to obtain the recovered acid, as agent and solvent recycling, reducing the discharge of chemical reagent waste water and reducing the production cost.