Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 746, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.141186
Keywords
Singlet oxygen; Indoor air pollution; Bacteria/virus inactivation; Air purifier; Rose Bengal; Membrane filter
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Funding
- Yokota Kogyo Shokai Co. Inc., Hiroshima, Japan
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Airborne infectious diseases such as the new Coronavirus 2019 (COVID-19) pose serious threat to human health. Indoor air pollution is a problem of global environmental concern as well. Singlet oxygen (O-1(2)) is a reactive oxygen species that plays important role in bacteria/virus inactivation and pollutant degradation. In this study, we found that commercially available filters typically deployed in air purifier and air conditioning units, when impregnated with Rose Bengal (RB) as a O-1(2) sensitizer, can be used for heterogeneous gas-phase generation of O-1(2). It was confirmed that irradiation of the RB filter under oxygen gas stream produced O-1(2), which was measured using furfuryl alcohol trapping method followed by HPLC analysis. It was also observed that the amount of O-1(2) generated increases as the light intensity increased. Similarly, the sensitizer loading also positively influenced the O-1(2) generation. The heterogeneous gas-phase generation of O-1(2) can find potential applications in air purifier and air conditioning units for the purpose of bacteria/virus inactivation and/or pollutant degradation thereby improving indoor air quality. (C) 2020 Elsevier B.V. All rights reserved.
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