▎ 摘　　要

NOVELTY - A zwitterion -graphene oxide film comprises graphene oxide, zwitter ions and additive A or additive B. USE - The zwitterionic-graphene oxide film is used in the field of gas separation, particularly for selectively separating carbon dioxide at higher temperatures (90degrees Celsius) (claimed). ADVANTAGE - The zwitterion -graphene oxide film has excellent carbon dioxide/nitrogen separation performance. The film is prepared by a simple method involving mild reaction conditions. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the preparation of zwitterionic-graphene oxide film.