▎ 摘　　要

NOVELTY - A composite air filter membrane comprises a sponge carbon film and an oxidized graphene compounded on the sponge carbon film through a chitosan molecule to form a chitosan-graphene oxide homogeneous membrane on the surface of the sponge carbon film. USE - Composite air filter membrane for removing organic pollutants from purge gas (all claimed). ADVANTAGE - The composite air filter membrane has strong electrostatic charge and high absorbing ability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for preparing a composite air filter membrane.