CoO QDs/Bi2MoO6 monolayer: A novel S-scheme heterojunction for highly efficient photocatalytic C2H4 degradation

•CoO was first used as C2H4 degradation photocatalyst in this study.•A 0D/2D CoO QDs/Bi2MoO6 monolayer S-scheme heterojunction is built.•This photocatalyst shows outstanding visible light activities for C2H4 degradation.•The S-scheme heterojunction enhances the stability of CoO in photocatalytic reaction.•The S-scheme heterojunction could apply in fruit and vegetable preservation.