▎ 摘　　要

NOVELTY - Preparing graphene oxide/chitosan adsorption medium comprises (a) preparing a graphene oxide/chitosan mixed solution by mixing a graphene oxide aqueous solution and a chitosan solution; and (b) freeze-drying the graphene oxide/chitosan mixed solution to prepare an adsorption medium in the form of a foam. USE - The graphene oxide/chitosan adsorption medium is useful for adsorbing and removing heavy metals (i.e. cadmium, lead, nickel, copper and/or zinc) from water (all claimed). ADVANTAGE - The medium can efficiently remove cationic heavy metals from water, and has excellent adsorption performance and effectively overcomes the problems of reduced coating efficiency and reduced stability occurring in the sponge-type adsorption medium according to the prior art, prevents agglomeration or restacking of graphene oxide during the manufacturing process, and optimizes adsorption performance by forming a three-dimensional network structure between graphene oxides effective for adsorption. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: graphene oxide/chitosan adsorption medium prepared by the above method, where the medium having a porous structure, containing a hydroxy group (-OH), a carboxy group (-COOH) and an amino group (-NH2P), where the adsorption medium exhibits a maximum adsorption performance of ≥ 270 mg/g for cadmium cations in the Langmuir isothermal adsorption experiment; and adsorbing and removing heavy metals in water, comprising injecting the adsorption medium into contaminated water to adsorb and remove heavy metal cations.