High photocatalytic activity of 2D sheet structure ZnO/Bi <sub>2</sub> WO <sub>6</sub> Z-scheme heterojunction under simulated sunlight
Jihai Duan, Miyu Liu, Yue Guo, Weiwen Wang, Zisheng Zhang, Chaojie Li
Abstract
Abstract The ZnO/Bi 2 WO 6 sheet structure was synthesized by a simple two-step hydrothermal method, and the structure in which the sheet was in close contact with the sheet improved the photocatalytic performance of Bi 2 WO 6 . Under simulated sunlight, ZnO/Bi 2 WO 6 showed excellent photocatalytic activity for the degradation of phenolic contaminants. The degradation rate of (1:1) ZnO/Bi 2 WO 6 to phenol, p-nitrophenol and p-chlorophenol was about 4 times, 7.69 times and 5 times than pure Bi 2 WO 6 , respectively. The increase in photocatalytic activity is attributed to the Z scheme heterostructure formed by the two semiconductors, which can effectively separate photogenerated carriers. Compared with a single catalyst, ZnO/Bi 2 WO 6 exhibits excellent charge transport properties in photoelectric conversion. Trap experiments of active species have shown that h + and play a major role in photocatalysis. This study proposes a feasible solution for the treatment of a class of pollutant wastewater.