▎ 摘　　要

Constructing heterojunction is one promising strategy to improve the transfer and separation of photoinduced charge carriers of graphitic carbon nitride (CN). Herein, nonmetal N, S-doped graphene quantum dots (N, S-GQDs)/g-C3N4 nanocomposite photocatalysts were successfully synthesized by calcining N, S-GQDs (NSGs) and melamine at elevated temperature. The optimal 06NSG-CN composite effectively reduced the concentration of Escherichia coli flora under visible light irradiation by superoxide and super hydroxyl radicals. Meanwhile, the optimum photocatalytic hydrogen evolution reaches 50.9 mu mol/h, about 16.9 times that of pure phase CN under visible light. Graphitic carbon nitride (g-C3N4) grafted with N, S-doped GQDs could increase the specific surface area, promote the absorption and utilization of visible light, and inhibited the recombination of photoinduced electron-hole pairs, resulting in excellent photocatalytic antibacterial activity.