▎ 摘　　要

NOVELTY - Preparing modified graphene comprises uniformly dispersing the graphene oxide and the amine-based modifier by a graft reaction to obtain graphene oxide material liquid, and drying, the amine-based modifier is (a) containing at least one structural unit of an ethyl group, a vinyl group, a vinyl ether group, a glycol group, and a glycol ether group amine compounds, and (b) beta -ketoamide or its derivatives having the function of complexing metal ions. USE - The graphene/product are useful for removing metal ions, preferably copper ions, chromium ions, nickel ions, zinc ions, uranyl ion, cadmium ion, mercury ion, a thallium ion and lead ion (all claimed). ADVANTAGE - The method is simple. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) modified graphene prepared according to above mentioned method; and (2) product for removing metal ions in water, comprising the liquid dispersion, powder or macroscopic body of the modified graphene.