期刊
CHEMOSPHERE
卷 72, 期 2, 页码 174-181出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2008.01.071
关键词
photocatalytic disinfection; heteropoly acid; deactivating microorganisms; Escherichia coli; reactive oxygen species
资金
- National Research Foundation of Korea [2005-02234, 과C6A1903, R11-2003-006-04004-0, 핵C6A1603, R11-2000-070-08001-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The photocatalytic inactivation (PCI) of Escherichia coli (Gram-negative) and Bacillus subtilis (Gram-positive) was performed using polyoxometalate (POM) as a homogeneous photocatalyst and compared with that of heterogeneous TiO(2) photocatalyst. Aqueous suspensions of the microorganisms (10(7)-10(8) cfu ml(-1)) and POM (or TiO(2)) were irradiated with black light lamps. The POM-PCI was faster than (or comparable to) TiO(2)-PCI under the experimental conditions employed in this study. The relative efficiency of POM-PCI was species-dependent. Among three POMs (H(3)PW(12)O(40), H(3)PMo(12)O(40), and H(4)SiW(12)O(40)) tested in this study, the inactivation of E. coli was fastest with H(4)SiW(12)O(40) while that of B. subtilis was the most efficient with H(3)PW(12)O(40). Although the biocidal action of TiO(2) photocatalyst has been commonly ascribed to the role of photogenerated reactive oxygen species such as hydroxyl radicals and superoxides, the cell death mechanism with POM seems to be different from TiO(2)-PCI, While TiO(2) caused the cell membrane disruption, POM did not induce the cell lysis. When methanol was added to the POM solution, not only the PCI of E coli was enhanced (contrary to the case of TiO(2)-PCI) but also the dark inactivation was observed. This was ascribed to the in situ production of formaldehyde from the oxidation of methanol. The interesting biocidal property of POM photocatalyst might be utilized as a potential disinfectant technology. (C) 2008 Elsevier Ltd. All rights reserved.
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