▎ 摘　　要

NOVELTY - Preparing graphene oxide/polyethyleneimine/cellulose composite hydrogel comprises (i) dispersing graphene oxide in N-methylmorpholine N-oxide to obtain graphene oxide suspension, mixing polyethyleneimine, crosslinking agent, antioxidant, N-methylmorpholine N-oxide and cellulose to obtain cellulose solution, (ii) reacting graphene oxide suspension and cellulose solution to obtain reaction product, and (iii) subjecting reaction product to solidification and washing to obtain final product. USE - The composite hydrogel is useful in adsorption of heavy metal ions in wastewater (claimed). ADVANTAGE - The graphene, polyethyleneimine and cellulose with each other exhibits synergistic effect, and improve adsorption capacity of heavy metal ions in wastewater, and adsorption capacity of chromium ions reaches 4317 mu g/g. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for graphene/polyethyleneimine/cellulose composite hydrogel obtained by above method.