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Title: Rapid water disinfection using vertically aligned MoS 2 nanofilms and visible light

Abstract

Here, solar energy is readily available in most climates and can be used for water purification. However, solar disinfection of drinking water (SODIS) mostly relies on ultraviolet light, which represents only 4% of total solar energy, and this leads to slow treatment speed. The development of new materials that can harvest visible light for water disinfection, and speed up solar water purification, is therefore highly desirable. Here, we show that few-layered vertically aligned MoS 2 (FLV-MoS 2) 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 MoS 2 was increased from 1.3 eV to 1.55 eV by decreasing the domain size, which allowed the FLV-MoS 2 to generate reactive oxygen species (ROS) for bacterial inactivation in water. The FLV-MoS 2 showed ~15 times better log inactivation efficiency of indicator bacteria compared to bulk MoS 2, and much faster inactivation of bacteria under both visible light and sunlight illumination compared to widely used TiO 2. Moreover, by using a 5 nm copper film on top of the FLV-MoS 2 as a catalyst to facilitate electron-hole pair separation and promote the generation of ROS, themore » disinfection rate was further increased 6 fold. With our approach, we achieved water disinfection of >99.999% inactivation of bacteria in 20 minutes with a small amount of material (1.6 mg/L) under simulated visible light.« less

Authors:
 [1];  [1];  [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2]
  1. Stanford Univ., Stanford, CA (United States)
  2. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1340155
Alternate Identifier(s):
OSTI ID: 1349090
Report Number(s):
SLAC-PUB-16911
Journal ID: ISSN 1748-3387; TRN: US1701722
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nature Nanotechnology
Additional Journal Information:
Journal Volume: 11; Journal ID: ISSN 1748-3387
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; CHEM; ENV; MATSCI; photocatalysis; two-dimensional materials; 36 MATERIALS SCIENCE

Citation Formats

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., and Cui, Yi. Rapid water disinfection using vertically aligned MoS2 nanofilms and visible light. United States: N. p., 2016. Web. doi:10.1038/nnano.2016.138.
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. Rapid water disinfection using vertically aligned MoS2 nanofilms and visible light. United States. doi:10.1038/nnano.2016.138.
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., and Cui, Yi. Mon . "Rapid water disinfection using vertically aligned MoS2 nanofilms and visible light". United States. doi:10.1038/nnano.2016.138. https://www.osti.gov/servlets/purl/1340155.
@article{osti_1340155,
title = {Rapid water disinfection using vertically aligned MoS2 nanofilms and visible light},
author = {Liu, Chong and Kong, Desheng and Hsu, Po -Chun and Yuan, Hongtao and Lee, Hyun -Wook and Liu, Yayuan and Wang, Haotian and Wang, Shuang and Yan, Kai and Lin, Dingchang and Maraccini, Peter A. and Parker, Kimberly M. and Boehm, Alexandria B. and Cui, Yi},
abstractNote = {Here, solar energy is readily available in most climates and can be used for water purification. However, solar disinfection of drinking water (SODIS) mostly relies on ultraviolet light, which represents only 4% of total solar energy, and this leads to slow treatment speed. The development of new materials that can harvest visible light for water disinfection, and speed up solar water purification, is therefore 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 eV to 1.55 eV by decreasing the domain size, which allowed the FLV-MoS2 to generate reactive oxygen species (ROS) for bacterial inactivation in water. The FLV-MoS2 showed ~15 times better log inactivation efficiency of indicator bacteria compared to bulk MoS2, and much faster inactivation of bacteria under both visible light and sunlight illumination compared to 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 further increased 6 fold. With our approach, we achieved water disinfection of >99.999% inactivation of bacteria in 20 minutes with a small amount of material (1.6 mg/L) under simulated visible light.},
doi = {10.1038/nnano.2016.138},
journal = {Nature Nanotechnology},
number = ,
volume = 11,
place = {United States},
year = {Mon Aug 15 00:00:00 EDT 2016},
month = {Mon Aug 15 00:00:00 EDT 2016}
}

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