▎ 摘　　要

NOVELTY - Preparation method of graphene quantum dots (GQDs)/zinc-benzimidazole (BIM)-histidine composite photocatalyst, involves (a) preparing zinc-BIM by wet chemical method, (b) performing surface defect treatment on the zinc-BIM prepared in step (a), to obtain defective zinc-BIM-histidine, and (c) using GQDs to hybridize the defect zinc-BIM-histidine to obtain the photocatalyst. USE - The method is used for preparation of GQDs/BIM-histidine composite photocatalyst, which is used in the photocatalytic conversion of carbon dioxide (claimed). ADVANTAGE - The method utilizes easily available raw materials, and has simple preparation, can easily control the preparation conditions. The prepared photocatalyst is a green and pollution-free high-performance catalyst, which can efficiently convert the greenhouse gas carbon dioxide into fuel.