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장재성

Jang, Jaesung
Sensors & Aerosols Lab.
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Inactivation of airborne viruses using vacuum ultraviolet photocatalysis for a flow-through indoor air purifier with short irradiation time

Author(s)
Kim, JeonghyunJang, Jaesung
Issued Date
2018-05
DOI
10.1080/02786826.2018.1431386
URI
https://scholarworks.unist.ac.kr/handle/201301/23250
Fulltext
https://www.tandfonline.com/doi/abs/10.1080/02786826.2018.1431386
Citation
AEROSOL SCIENCE AND TECHNOLOGY, v.52, no.5, pp.557 - 566
Abstract
Many ultraviolet (UV)-based disinfection methods have been developed; however, these methods usually use the recirculating mode or need long irradiation periods due to its low photon energy. Vacuum UV (VUV) was recently found to be a promising light source, despite its ozone generation. In this study, we investigated photocatalysis reactions by VUV with short irradiation times (0.004-0.125 s) for simultaneously inactivating airborne MS2 viruses and degrading the generated ozone toward a flow-through air disinfection system with high flow-rates. We developed three effective shapes for the catalyst frame: 2mm and 5mm pleated, and spiral-type Pd-TiO2 catalysts. The 2mm pleated Pd-TiO2/VUV photocatalyst exhibited the highest activity for simultaneous MS2 inactivation and ozone degradation, and the catalytic activity was effective regardless of relative humidity. Considering the gas phase and catalyst surface effects, and the natural inactivation of VUV-irradiated but live MS2 viruses, the 2mm pleated Pd-TiO2/VUV and succeeding UV photocatalysis showed more than 90% in the overall inactivation efficiency with residual ozone of 35 ppb at an irradiation time of 0.009 s (flow-rate: 33l/min). In contrast, most UV-based purifiers take longer times for disinfection. This system has the potential for an alternative to conventional UV-based air purifiers.Copyright
Publisher
TAYLOR & FRANCIS INC
ISSN
0278-6826
Keyword
RELATIVE-HUMIDITYTITANIUM-DIOXIDEGASEOUS TOLUENETIO2DEGRADATIONOZONECONTAMINANTSBACTERIAREMOVALQUALITY

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