期刊
ENVIRONMENTAL SCIENCE-NANO
卷 5, 期 1, 页码 72-82出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7en00702g
关键词
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资金
- NSF award [1602273]
- U.S. EPA award [83560201]
- Office of the Vice President for Research at UT Austin
- Universidad de los Andes
- Fulbright-COLCIENCIAS-DNP
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1602273] Funding Source: National Science Foundation
Due to the position of microwave (MW) radiation in the electromagnetic spectrum, it has not yet been successfully utilized to inactivate waterborne microorganisms at a reasonable (energy) cost. Exceptional properties at the nano-scale, namely MW absorption-abilities of carbon nanotubes and excellent spectral conversion-capabilities of lanthanide series metal oxides in concert, hold promise to overcome the energetic barrier of this widely used and affordable technology. This study reports the synthesis of a nanoheterostructure that combines carbon nanotubes' and erbium oxide's properties to generate reactive oxygen species (ROS) and inactivate Pseudomonas aeruginosa. Detailed characterization of the synthesized nanohybrid (NH) material with electron microscopy, X-ray techniques, and thermal gravimetric analysis confirms effective hybridization. At least one log unit of microbial inactivation was achieved via ROS generation with only 20 s of MW irradiation at 110 W (0.0006 kW h energy use), using a conventional MW oven. Inactivation studies with ROS scavenger molecules prove that the generated oxygen species played the dominant role in bacterial inactivation. These breakthrough results hold promise to enable an unintended use (i.e., disinfection) of MW technology, which is diffused deep into the global societal fabric.
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