▎ 摘　　要

NOVELTY - Preparing nano material doped with a metal compound involves mixing graphene-like carbon nitride (C3N4) nanosheets and metal compound nanoparticles, sequentially adopting ultrasonic bath treatment, stirring treatment, and cleaning treatment to obtain a solid. The solids are sequentially dried for the first time, washed for the first time, left standing, solid-liquid separation, washed for the second time, separated by filtration, and dried for the second time to obtain graphene-like C3N4 nanosheets doped with metal compounds. The graphene-like C3N4 nanosheets doped with the metal compound are mixed with the suspension of photosynthetic bacteria, shaking treatment is performed, filtered, and dried in sequence to obtain the nanomaterial doped with the metal compound. USE - Method for preparing nano material doped with a metal compound for purifying water body (claimed). ADVANTAGE - The method enables to prepare nano material doped with a metal compound, which has good photo-catalytic activity, adsorbability and stability.