NDLI: Photocatalytic disinfection of indoor suspended microorganisms (Escherichia coli and Bacillus subtilis spore) with ultraviolet light

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Photocatalytic disinfection of indoor suspended microorganisms (Escherichia coli and Bacillus subtilis spore) with ultraviolet light

Content Provider	Semantic Scholar
Author	Yoon, Young Han Nam, Sook-Hyun Joo, Jin Chul Ahn, Hosang
Copyright Year	2014
Abstract	New control methods are proposed for indoor air quality by removing fine airborne dust-particles. As suspended fine dust-particles contain inorganic dust as well as fine organic bacteria, studies for simultaneous control of these contaminants are required. In this study, photocatalytic disinfection of indoor suspended microorganisms such as E. coli and Bacillus subtilis is performed by three types of photocatalysts with UVA irradiation. The UVA irradiation strength was controlled to the minimum 3 ㎼/㎠, and ZnO, TiO2, and ZnO/Laponite ball were used as the catalysts. The results indicate that E. coli was removed over 80 % after about 2 hours of reaction with UVA and all three types of photocatalysts, whereas only with UVA, around 50 % E. coli removal was obtained. Among the catalysts, ZnO/Laponite composite ball was found to have similar sterilizing capacity to TiO2. However, in case of B. subtilis, which has thick cell wall in its spore state, disinfection was not effective under the low UVA irradiation condition, even with the catalysts. Further studies need to figure out the optimal UVA irradiation ranges as well as photocatalysts doses to control airborne dust, to provide healthy clean air environment.
Starting Page	1204
Ending Page	1210
Page Count	7
File Format	PDF HTM / HTML
DOI	10.5762/KAIS.2014.15.2.1204
Volume Number	15
Alternate Webpage(s)	http://jkais99.org/journal/v15n2/SHGSCZ_2014_v15n2_1204/46wp/46wp.pdf
Alternate Webpage(s)	https://doi.org/10.5762/KAIS.2014.15.2.1204
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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