▎ 摘　　要

NOVELTY - A graphene cement based material comprises 0.09-0.225 wt.% graphene, 400-500 wt.% cement, 1000-1500 wt.% sand and 200-250 wt.% water. USE - Graphene cement based material for adsorbing heavy metal ions, used for drainage pipe, artificial river bed and sewage precipitation pool. ADVANTAGE - The graphene cement based material effectively absorbs heavy metal ions in polluted water, and ensures environmentally-friendly effect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation method of graphene cement based material, which involves taking graphene, cement, sand and water, mixing graphene and water, ultrasonically processing for 30 minutes, obtaining aqueous solution of functionalized graphene, sequentially adding functionalized graphene solution, cement and sand into a reaction kettle, mixing, obtaining graphene cement-based material, stirring graphene cement-based material, loading into mold, keeping for 24 hours, placing the cement-based material graphene product in water at 20 plus minus 1 degrees C, curing for 28 days and removing the graphene cement based material from the mold.