Dual II Heterojunctions Metallic Phase MoS2/ZnS/ZnO Ternary Composite with Superior Photocatalytic Performance for Removing Contaminants

Graphical Photofit : Fabricating a high-performance photocatalyst to efficiently solve serious environmental problems is an urgent affair. A series of MoS 2 /ZnO composites were successfully fabricated through a facile hydrothermal route, leading to a highly efficient MoS 2 /ZnS/ZnO ternary photocatalyst for environmental treatment. Fabricating a high-performance photocatalyst to efficiently solve serious environmental problems is an urgent affair. Herein, a series of MoS 2 /ZnO composites were successfully fabricated through a facile hydrothermal route using Na 2 MoO 4 , (NH 2 ) 2 CS and urchin-like ZnO as precursors. According to the results of XRD and XPS, it was found that ZnS appeared in MoS 2 /ZnO composite; meanwhile, the content was positively correlated with the weight of the precursor (NH 2 ) 2 CS. It should be noted that the morphology and the metallic phase content of MoS 2 grown in situ on the surface of ZnO were affected by the molar ratio of Na 2 MoO 4 and ZnO. Benefiting from the special dual II heterojunctions of MoS 2 /ZnS/ZnO ternary composite, the material exhibited excellent charge separation and transfer performances. In the photocatalytic measurements, the MoS 2 /ZnS/ZnO (Na 2 MoO 4 :ZnO 1:2 MZ2) composite not only exhibits excellent photocatalytic Cr VI reduction activity of 42.3×10 −3 min −1 , but also displays remarkable adsorption performance (nearly 32.1 %) for Cr 2 . In addition, the ternary composite shows dominant photocatalytic Cr VI reduction activities compared to other photocatalysts. This work provides a high-efficient MoS 2 /ZnS/ZnO ternary photocatalyst for environmental treatment.