光催化
钨酸盐
材料科学
异质结
X射线光电子能谱
光致发光
硫化铜
介电谱
漫反射红外傅里叶变换
光电流
可见光谱
光谱学
化学工程
光电子学
铜
电化学
化学
电极
催化作用
冶金
物理化学
工程类
物理
量子力学
生物化学
作者
Yan-Ran Lv,Run-Kai He,Zhuoyue Chen,Xin Li,Yuehua Xu
标识
DOI:10.1016/j.jcis.2019.10.064
摘要
Hierarchical copper sulfide/bismuth tungstate (CuS/Bi2WO6) p–n junction with two-dimensional (2D) interfacial coupling were prepared through a two-step hydrothermal method. The as-prepared samples were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, diffuse reflectance spectroscopy, photoluminescence spectroscopy, photocurrent and electrochemical impedance spectroscopy. CuS nanoplates anchored on the surface of hierarchical Bi2WO6 microspheres consisting of Bi2WO6 nanosheets to form a CuS/Bi2WO6 p–n junction photocatalyst. The photocatalytic activity of glyphosate degradation over CuS/Bi2WO6 under 44 W light-emitting diode (LED) light irradiation (λ > 400 nm) was investigated. The results indicate that the CuS/Bi2WO6 heterojunctions display higher photocatalytic activity than pure CuS and Bi2WO6. The improved photocatalytic activity of the CuS/Bi2WO6 heterostructures can be attributed to strong visible light absorption and enhanced separation of photogenerated charge carriers by the internal electric field near the interface of the p-n junction. In addition, the CuS/Bi2WO6 p–n junction photocatalysts consisting of nanosheets are beneficial for the transport of photoexcited charge carriers, thus resulting in the increase of the photocatalytic activity of glyphosate degradation. This work provides the new avenue for the development and design p-n junction materials for photocatalytic applications.
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