▎ 摘　　要

NOVELTY - The preparation method of graphene sponge material involves: (1) ultrasonically treating graphene oxide and carbon nanotubes to obtain mixed aqueous solution; and (2) transferring mixed aqueous solution obtained in step (1) to reaction kettle, heating at constant temperature, naturally cooling, and performing freeze-drying process. The mass ratio of graphene oxide and carbon nanotubes is 20-5:1. USE - The method is useful for preparing graphene sponge material, which is useful for purifying air including formaldehyde, sulfur dioxide, ammonia, carbon monoxide, nitric oxide or carbon dioxide (claimed). ADVANTAGE - The method prepares graphene sponge material with excellent adsorption performance and circulation performance.