▎ 摘　　要

NOVELTY - Preparing carboxylated graphene oxide (GOC)/polyethylenimine (PEI) composite adsorbent involves preparing GOC, coupling PEI and diethylenetriaminepentaacetic acid to obtain a coupling reaction product, and crosslinking the GOC and the coupling reaction product. USE - The method is useful for preparing GOC/PEI composite adsorbent, which is useful in water treatment (all claimed) for processing heavy metal ions and dye molecules. ADVANTAGE - The method provides GOC/PEI composite adsorbent, which has high adsorption capacity and recycling rate.