Transparent Glass with the Growth of Pyramid-Type MoS 2 for Highly Efficient Water Disinfection under Visible-Light Irradiation

作者：Pengfei Cheng, Qingwei Zhou, Xianbiao Hu, Shaoqiang Su, Xin Wang, Mingliang Jin, Lingling Shui, Xingsen Gao, Yan‐Qing Guan, Richard Nözel, Guofu Zhou, Zhang Zhang, Jun‐Ming Liu · 发表于：ACS Applied Materials & Interfaces · 年份：2018 · DOI：10.1021/acsami.8b06656 · 被引用次数：61 · 研究领域：Advanced Photocatalysis Techniques、Gas Sensing Nanomaterials and Sensors、Ga2O3 and related materials

Water disinfection is of great importance for human health and daily life. Photocatalysts with high efficiency, environmental protection, and narrow bandgaps are critical for practical water treatment. Here, a general approach is reported for the direct growth of pyramid-type MoS 2 (pyramid MoS 2 ) on transparent glass by chemical vapor deposition (CVD). The pyramid MoS 2 exhibits a smaller bandgap and higher bactericidal activity than most TiO 2 -based photocatalysts. The adjustable-bandgap nature of two-dimensional (2-D) MoS 2 can harvest a wide spectrum of sunlight and provide more active sites with which to generate reactive oxygen species (ROS) for bacterial death in water. Furthermore, silver (Ag) with several nanometers thicknesses is thermally evaporated on the pyramid MoS 2, which can greatly facilitate electron–hole pair separation to generate more ROS and has a certain bactericidal effect. With our established approach, under simulated visible light, more than 99.99% of Escherichia coli can be successfully deactivated in 40 min, with an effective mass per unit of less than 0.7 mg L –1 in a 0.9 wt % NaCl solution. Besides, for the first time, the generation of ROS is confirmed with in situ Raman spectroscopy on pyramid MoS 2 @Ag glass, and the related bactericidal mechanism is present as well.