▎ 摘　　要

NOVELTY - A ZIF-67/graphene oxide photocatalytic-photothermal composite film is prepared by adding graphene oxide into ultra-pure water to obtain graphene oxide aqueous solution, filtering on PTFE membrane, drying at normal temperature to obtain graphene oxide film, pouring cobalt(II) nitrate hexahydrate solution into culture dish filled with graphene oxide film, keeping at 35-45 degrees C for 8-24 hours, pouring solution, cleaning film by methanol, pouring 2-methylimidazole solution into culture dish filled with graphene oxide film soaked by cobalt(II) nitrate hexahydrate solution, keeping at 35-45 degrees C for 8-24 hours, pouring solution, cleaning film with methanol, and drying in vacuum drying box. USE - The method is used for preparing ZIF-67/graphene oxide photocatalytic-photothermal composite film for photocatalytic-photothermal synergistic catalytic reduction of metal ion (claimed). ADVANTAGE - The film has simple preparation method, low cost and excellent photocatalysis-photothermal synergistic performance.