Abstract
Zinc sulfur quantum dots‐reduced graphene oxide (ZnS QDs‐rGO) composites are successfully synthesized by a one‐step hydrothermal method. The ZnS QDs are well scattered on the surface of the wrinkled rGO with smaller particle size compared with initial ZnS QDs. The influence of the content of rGO in composites on the photocatalytic effect is also investigated in detail. The ZnS QDs‐1.0% rGO has the highest photocatalytic activity and the degradation kinetics of methylene blue is more consistent with the zero order kinetic model than the pseudo first order kinetic model in this experiment. The mechanism for the enhancement of photocatalytic activity is mainly due to promoting separation of the photogenerated carriers with the introduction of rGO and the increase in specific surface area of ZnS QDs due to decrease in size. These results reveal that the effective synergistic action between ZnS QDs and rGO is the key factor to determine the photocatalytic degradation efficiency of the ZnS QDs‐rGO composites.
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