▎ 摘　　要

NOVELTY - Preparing modified graphene-based iron oxide nano-composite material, comprises (i) dissolving 3-mercaptopropyl triethoxysilane in a solvent, in the volume ratio of 1:150, adjusting the pH of the solution by adding glacial acetic acid, and hydrolyzing; and (ii) uniformly dispersing the graphene-based iron oxide nano-particles in hydrolysis solution having concentration of 1 g/l, and reacting under room temperature and heating condition respectively, and washing the mixture with ethanol, performing vacuum drying to obtain the product. USE - The nano-composite material is useful in the absorption of heavy metal ions, preferably cadmium ions (all claimed) in sewage. ADVANTAGE - The method has relatively simple preparation requirements. The nano-composite material has good absorption ability.