▎ 摘　　要

NOVELTY - A composite material comprises polymer stack into hole wall of graphene oxide layer and crosslinkable polyacrylamide to form supporting material and covalently bonded by tannic acid and tetraethylene pentamine after polymerization of poly(tannin-tetraethylene pentamine). USE - Composite material used for removing hexavalent chromium ion (claimed). ADVANTAGE - The composite material has simple preparation method, mild reaction condition, and strong hexavalent chrome ion adsorption ability, and can be applied in treatment of waste water containing chromium. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of composite material comprising mixing graphene oxide, polyacrylamide, tannic acid, and tetraethylene pentamine, and water, reacting, and drying.