▎ 摘　　要

NOVELTY - Graphene composite oxide film comprises oxidized graphene, amino-carboxy complexing agent and organic macromolecular flocculating agent, where the mass ratio of oxidized graphene to amino-carboxy complexing agent is 1:5-10, and the mass ratio of amino-carboxy complexing agent to organic high molecular flocculating agent is 1-5:1. USE - The film is useful for selectively removing metal ion in water (claimed). ADVANTAGE - The film has enhanced selective absorption capacity, improved retention and increased stability in the water environment. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing graphene composite oxide film comprising uniformly dispersing graphene oxide, amino-carboxy complexing agent and organic macromolecular flocculating agent in solvent to obtain mixed dispersion solution, and then mixing the mixed solution to obtain final product; and (2) use of graphene oxide composite film for selectively removing metal ions in waste water, comprising adjusting pH of waste water to 2-8, then treating and filtering using graphite oxide ethylene composite membrane.