▎ 摘　　要

Design and synthesis of photocatalysts with high charge separation and transfer efficiency are of considerable significance in environmental remediation. Herein, N, S co-doped graphene quantum dots (N, S-GQDs) decorated Bi4O5BrxI2_x solid solution was synthesized by temperature controlled in-situ coprecipitation method. The light absorption and absorption edge gap were improved significantly because of the formation of solid solution Bi4O5BrxI2_x, as well as N, S-GQDs was uniformly dispersed in the Bi4O5BrxI2_x nanosheets with diameter of about 10 nm, which enriched surface structure of Bi4O5BrxI2_x. Due to the enrichment electron effect of N,SGQDs, the electron transferred from N,S-GQDs to Bi4O5Br0.8I1.2 and enriched on the N,S-GQDs surface, resulting in efficient interface charge transfer and separation and the formation of superoxide radicals. These prominent advantages bring improved photocatalytic activity of the N, S-GQDs/Bi4O5Br0.8I1.2 for efficient removal of phenol. It displayed the optimal photocatalytic phenol degradation rate of 97.04% under visible light irradiation, which was 3.81 times higher than that of Bi4O5Br0.8I1.2 solid solution. This work could provide new insight into enhancing the photocatalytic performance of Bi4O5Br0.8I1.2 solid solution by graphene quantum dots modification and provide a strategy for photocatalytic phenol degradation.