Rapid water disinfection using vertically aligned MoS2 nanofilms and visible light

Liu, Chong; Kong, Desheng; Hsu, Po -Chun; Yuan, Hongtao; Lee, Hyun -Wook; Liu, Yayuan; Wang, Haotian; Wang, Shuang; Yan, Kai; Lin, Dingchang; Maraccini, Peter A.; Parker, Kimberly M.; Boehm, Alexandria B.; Cui, Yi

doi:10.1038/nnano.2016.138

Title: Rapid water disinfection using vertically aligned MoS₂ nanofilms and visible light

Journal Article · Mon Aug 15 00:00:00 EDT 2016 · Nature Nanotechnology

DOI:https://doi.org/10.1038/nnano.2016.138· OSTI ID:1340155

Liu, Chong ^[1]; Kong, Desheng ^[1]; Hsu, Po -Chun ^[1]; Yuan, Hongtao ^[1];

^[1]; Liu, Yayuan ^[1];

^[1]; Wang, Shuang ^[1]; Yan, Kai ^[1]; Lin, Dingchang ^[1]; Maraccini, Peter A. ^[1]; Parker, Kimberly M. ^[1]; Boehm, Alexandria B. ^[1]; Cui, Yi ^[2]

Stanford Univ., Stanford, CA (United States)
Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)

In most climates, solar energy is readily available and can be used for water purification. But, solar disinfection of drinking water mostly relies on ultraviolet light, which represents only 4% of the total solar energy, and this leads to a slow treatment speed. Therefore, the development of new materials that can harvest visible light for water disinfection, and so speed up solar water purification, is highly desirable. Here we show that few-layered vertically aligned MoS₂ (FLV-MoS₂) films can be used to harvest the whole spectrum of visible light (~50% of solar energy) and achieve highly efficient water disinfection. The bandgap of MoS₂ was increased from 1.3 to 1.55 eV by decreasing the domain size, which allowed the FLV-MoS₂ to generate reactive oxygen species (ROS) for bacterial inactivation in the water. The FLV-MoS₂ showed a ~15 times better log inactivation efficiency of the indicator bacteria compared with that of bulk MoS₂, and a much faster inactivation of bacteria under both visible light and sunlight illumination compared with the widely used TiO₂. Moreover, by using a 5 nm copper film on top of the FLV-MoS₂ as a catalyst to facilitate electron–hole pair separation and promote the generation of ROS, the disinfection rate was increased a further sixfold. Here, we achieved water disinfection of >99.999% inactivation of bacteria in 20 min with a small amount of material (1.6 mg l–1) under simulated visible light.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1340155

Alternate ID(s):: OSTI ID: 1349090

Report Number(s):: SLAC-PUB-16911; TRN: US1701722

Journal Information:: Nature Nanotechnology, Vol. 11; ISSN 1748-3387

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 609 works

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Efficient photocatalytic reactions of Cr( vi ) reduction and ciprofloxacin and RhB oxidation with Sn( ii )-doped BiOBr Xu, Ling; Chen, Wen-qian; Ke, Shu-qiang Catalysis Science & Technology, Vol. 9, Issue 21 https://doi.org/10.1039/c9cy01405e	journal	January 2019
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Title: Rapid water disinfection using vertically aligned MoS₂ nanofilms and visible light