Kinetic Analysis of Photosterilization Rate of Escherichia coli Cells in Titanium Dioxide Suspension Associated with Redox Reactions of Iron Ions.
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- KOIZUMI YOSHIYUKI
- Department of Chemical Science and Engineering, Graduate School of Engineering Science, Osaka University
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- NISHI JUMPEI
- Department of Chemical Science and Engineering, Graduate School of Engineering Science, Osaka University
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- TAYA MASAHITO
- Department of Chemical Science and Engineering, Graduate School of Engineering Science, Osaka University Research Center for Solar Energy Chemistry, Osaka University
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Abstract
Photosterilization of Escherichia coli cells was investigated using TiO2 particles in the presence of ferric ion as an electron acceptor. Deactivation of the cells was recognized in the reaction mixture containing ferric ion at the initial concentration of CFe3, 0 = 1, 30 and 100 × 10-3 mol/m3 and the cell deactivation did not occur in the absence of ferric ion. The apparent sterilization rate constant, k', was determined from the photoreaction tests conducted under the varied conditions of average light intensity (Iobs = 0-22 W/m2) and TiO2 concentration (CTO = 0-0.1 kg/m3). A proportional relation was obtained between the values of k' and Iobs with the slope of k'/ Iobs = 3.8 × 10-5 m2/J at CTO = 0.01 kg/m3, while the value of k'/ Iobs increased with an increase in TiO2 concentration depicting a saturated profile up to CTO = 0.1 kg/m3 at Iobs = 8, 13 and 22 W/m2. This relation between the values of k'/ Iobs and CTO could be kinetically explained by considering the photoreactions of ferric and ferrous ions and the adsorption of TiO2 particles onto E. coli cells in the reaction mixture.
Journal
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- JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
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JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 34 (11), 1381-1386, 2001
The Society of Chemical Engineers, Japan
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Details 詳細情報について
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- CRID
- 1390001204564525952
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- NII Article ID
- 130000020260
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- NII Book ID
- AA00709658
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- ISSN
- 18811299
- 00219592
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- NDL BIB ID
- 5992925
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed