A highly efficient Au-MoS2 nanocatalyst for tunable piezocatalytic and photocatalytic water disinfection
A highly efficient Au-MoS2 nanocatalyst for tunable piezocatalytic and photocatalytic water disinfection
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DOI：
10.1016/j.nanoen.2018.12.006
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发表时间：
2019-03-01
期刊：
影响因子：
17.6
通讯作者：
Lin, Zong-Hong
中科院分区：
文献类型：
--
作者：
Chou, Ting-Mao;Chan, Shuen-Wen;Lin, Zong-Hong
清洁的水在我们的日常生活中至关重要。然而，近十亿人被迫饮用被细菌污染的水，导致腹泻、脱水，甚至死亡。此前，各种光催化剂已被应用于替代高成本、高毒性的污水处理方法。然而，外部光源的要求限制了它们的应用。在此，我们开发了一种基于单层和多层二硫化钼（MoS2）纳米片（NS）的新型纳米催化剂，它可以催化活性氧（ROS）的产生，通过压电效应（机械振动）或光催化效应（光照射）来灭活细菌。经过60分钟的机械振动或可见光照射后，MoS2 NSs可以将大肠杆菌（E. Coli）减少99.999%。此外，通过在MoS2 NSs上沉积Au纳米粒子（NPs）可以提高催化剂的ROS生成效率和细菌消毒性能。同样实现大肠杆菌 99.999% 减少的机械振动或可见光照射时间缩短至 45 分钟。此外，压电效应和光催化效应的混合产生的性能优于单独效应所获得的性能。通过机械振动和近红外 (NIR) 光照射的结合，大肠杆菌可在 15 分钟内减少 99.999%。这种 MoS2 纳米催化剂是下一代水净化系统的有前途的候选者，因为它能够被不同的环境刺激触发。
Clean water is essential in our daily life. However, nearly one billion people are forced to drink water contaminated with bacteria, leading to diarrhea, dehydration, and even death. Previously, various photocatalysts have been applied to replace high-cost and highly toxic methods for sewage treatment. Nevertheless, the requirement of external light sources limits their application. Herein, we develop a new type of nanocatalyst based on single- and few-layered molybdenum disulfide (MoS2) nanosheets (NSs) that can catalyze the generation of reactive oxygen species (ROS) to inactivate bacteria either through a piezoelectric effect (mechanical vibration) or photocatalytic effect (light irradiation). After 60 min of mechanical vibration or visible-light irradiation, the MoS2 NSs can reduce Escherichia coli (E. Coli) by 99.999%. In addition, the ROS generation efficiency and bacterial disinfection performance of the catalyst can be enhanced by depositing Au nanoparticles (NPs) on MoS2 NSs. The period of mechanical vibration or visible-light irradiation that achieves the same 99.999% reduction in E. coli is shortened to 45 min. Moreover, a hybridization of the piezoelectric and photocatalytic effects results in a performance superior to that obtained with the individual effects. A 99.999% reduction in E. coli is also accomplished within 15 min through a combination of mechanical vibration and near-infrared (NIR)-light irradiation. This MoS2 nanocatalyst is a promising candidate for nextgeneration water purification systems because of its ability to be triggered by diverse environmental stimuli.