▎ 摘　　要

NOVELTY - Graphene material comprises an amidated graphene aerogel with a rough surface, where the rough surface is used for absorbing heavy metal. USE - The material is useful for absorbing heavy metal including cadmium ion, cupric ion and chromium (III) ion (all claimed). ADVANTAGE - The material: is beneficial to increase the adsorption capacity of the material; and has a larger specific surface area, more adsorption sites per unit volume, relatively excellent adsorption effect on heavy metal ions in aqueous environment, and wide range of application scenarios in the field of sewage treatment. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the graphene materials, comprising (i) adding sodium hydroxide and monochloroacetic acid to the graphene oxide solution, performing ultrasonic reaction, and centrifuging the reacted system to obtain the primary carboxylated graphene product, (ii) using pure water as a cleaning agent, and washing the primary carboxylated graphene product to obtain carboxylated graphene with a rough surface, (iii) ultrasonically dispersing the carboxylated graphene with rough surface in pure water to obtain the carboxylated graphene solution, adding ethylene diamine to the carboxylated graphene solution, uniformly mixing, introducing under the first reaction conditions, carrying out the reaction to obtain first reaction system, and (iv) centrifuging the first reaction system, washing the centrifugal solid with pure water freezing and drying to obtain a graphene material with a rough surface.