▎ 摘　　要

NOVELTY - Graphene oxide comprises an oxygen-containing functional group comprising carboxyl and/or ketone groups, where the total number of carboxyls and ketone group is not exceed 30 % of the total amount of the oxygen containing functional group. USE - Preparation of graphene from graphene oxide (claimed). ADVANTAGE - The graphene oxide has improved thermal stability, and it reduces the proportion of the total number of carboxyl groups and ketone groups, and increases the proportion of stable epoxy groups and hydroxyl groups. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) a preparation method of graphene oxide involves adjusting the PH of graphene slurry to PH1to obtain an intermediate product and drying to obtain the graphene oxide ; and (2) graphene.