Z-scheme CuSbS2/ZnO Heterojunction for Enhanced Photocatalytic Degradation of RhB

The heterojunction structure photocatalysts are very promising for photocatalytic degradation dyes to resolve the organic industrial wastewater. In this work, an effective and solar light-driven Z-scheme heterojunction photocatalyst CAS/ZnO was prepared by two steps microwave irradiation method. The ZnO nanosheets were successfully compounded with CAS tetragonal particles aggregate. As the ZnO concentration increased, the absorbance decreased but the specific surface area increased. Rhodamine B (RhB) was tested for photodegradation by photocatalysts under a solar simulation in 120 min, and 3 M displayed the highest degradation rate (100 %), highest rate constant (0.021 min(-1)) and optimum stability. Furthermore, the main reactive species were superoxide radicals (O-2(-center dot)) and hydroxyl radicals (HO center dot). Also, mechanism of the Z-scheme migration of photon-generated carrier and photocatalytic degradation was proposed. This paper provides a new Z-scheme heterojunction CAS/ZnO photocatalyst for the treatment of organic pollutants.