Article ID Journal Published Year Pages File Type
30394 Journal of Photochemistry and Photobiology B: Biology 2009 5 Pages PDF
Abstract

The current study is the first to delineate the contribution of photocatalysis to inactivation of Bacillus cereus endospores on dry surfaces over a broad range (0–153 W/m2) of UVA irradiance. Inactivation of spores at low UVA irradiance (30 W/m2) was primarily due to photocatalysis, whereas at higher UVA irradiance inactivation was primarily due to UV alone. A linear relationship between UVA irradiance and the rate of spore inactivation was observed in the absence of photocatalyst. The rate of photocatalytic inactivation was non-linear with respect to UVA irradiance, exhibiting a maximum at 30 W/m2.

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