One-Step Hydrothermal Synthesis of ZnS Quantum Dots-Reduced Graphene Oxide Composites with Enhanced Photocatalytic Activity

摘要

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