▎ 摘　　要

NOVELTY - Preparing sponge-type adsorption medium comprises (a) preparing a carboxylated graphene oxide (CGO) in which the graphene oxide dispersed in an aqueous solution is added with chloroacetic acid under alkaline conditions to modify the surface of the graphene oxide with a carboxy group; (b) dispersing carboxylated graphene oxide (CGO) in deionized water (DI WATER) to prepare a carboxylated graphene oxide (CGO) aqueous solution; and (c) supporting a sponge including an amine group on the surface of the carboxylated graphene oxide aqueous solution, drying the sponge to coat the carboxylated graphene oxide on the surface of the sponge. USE - The sponge-type adsorption medium is useful for treating heavy metal-contaminated water (claimed). ADVANTAGE - The sponge-type adsorption medium can efficiently remove cationic heavy metals in water, and the carboxylated graphene oxide on the sponge surface and inside is cadmium (Cd), lead (Pb), nickel (Ni), has excellent adsorption performance for cationic heavy metals such as copper (Cu) and zinc (Zn) compared to granular zeolite, optimizes the adsorption performance by preventing aggregation or restacking of graphene oxide and forming a three-dimensional network structure between graphene oxides effective for adsorption, is easy to apply to a water treatment process, easy to recover, and does not generate secondary pollutants such as sludge. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for treating heavy metal-contaminated water, comprising adding the sponge-type adsorption medium is added to the contaminated water to adsorb and remove heavy metal cations.