▎ 摘　　要

NOVELTY - Preparation method of an amidated graphene aerogel, involves (a) adding sodium hydroxide and monochloroacetic acid to the graphene oxide solution, performing an ultrasonic reaction, and centrifuging the first system after reacting to obtain the primary carboxylated graphene, (b) using ethanol as a cleaning agent to wash the primary carboxylated graphene product to obtain a smooth surface of the carboxylated graphene, (c) ultrasonically dispersing the carboxylated graphene with a smooth surface in pure water to obtain a carboxylated graphene solution, and (d) adding ethylenediamine and ethanol to the carboxylated graphene solution, uniformly mixing the mixture and reacting under the first reaction conditions, and after reacting, subjecting the second system to post-treatment to obtain amidated graphene aerogel with smooth surface. USE - The method is used for preparation of an amidated graphene aerogel, where the amidated graphene aerogel is used for adsorbing heavy metals, and/or for adsorbing microorganisms in a water environment. The heavy metals include any one or more of cadmium ion, copper ions and chromium ions, and the microorganisms include denitrifying bacteria including one or more of Bacillus subtilis, Paracoccus, Pseudomonas and Rhododendron (all claimed). ADVANTAGE - The method introduces oxygen-containing groups with both biocompatibility and metal ion adsorption capacity on the surface of the graphene sheet, so as to improve the metal ion adsorption capacity of the graphene aerogel, which further enhances the adhesion to microorganisms. The surface of the aerogel prepared based on the ethanol environment is smooth, which reduces the sharp edges on the surface of the graphene aerogel that are damaging to microbial cells, and the biocompatibility of the gel is improved, which is conducive to the attachment of microorganisms. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for an amidated graphene aerogel is prepared by the above method.