▎ 摘　　要

NOVELTY - A functional substrate has a substrate, an organic layer containing reaction product of catechol or catecholamine and provided on at least one portion of the substrate, and a graphene oxide coating layer formed on at least one portion of organic layer. USE - Functional substrate for heavy metal adsorption substrate (claimed). ADVANTAGE - The functional substrate has excellent adsorption performance and mechanical properties. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for manufacture of functional substrate.