▎ 摘　　要

NOVELTY - Graphene oxide modified biological carbon composite material, comprises graphene oxide, biological coal and chitosan, where the graphene oxide, chitosan and biological coal are formed by support structure. USE - The material is useful for treating water containing lead (claimed). ADVANTAGE - The material has good adsorption capacity. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing graphene oxide modified biological carbon composite material, comprising: (i) preparing biological carbon, (ii) dissolving chitosan in acetic acid solution to obtain chitosan acetic acid mixed solution, (iii) mixing chitosan acetic acid mixed solution and graphene oxide to obtain chitosan/graphene oxide mixed solution, (iv) adding obtained step (i) prepared biological carbon into obtained step (iii) chitosan/graphene oxide mixed solution, mixing; and (2) prepared graphene oxide modified biological carbon composite material is useful for treating water containing lead.