Thirteen different commercial TiO 2 powders with specific surface areas varying from 9 to 335 m 2 /g and with isoelectric points (IEP) from 3 to 7.5 were investigated for their catalytic activity in E. coli inactivation. The TiO 2 samples zeta potential, attenuation sizes and isoelectric points (IEP) were measured by the electroacoustic method. The influence of the initial pH of the TiO 2 suspension was followed during the bacterial inactivation. It was observed that TiO 2 Degussa P-25 consisting of an anatase-rutile powder inactivated E. coli with high kinetics that did not vary with the initial pH of the suspension. This was not the case for the other TiO 2 samples used in this study. The IEP could be correlated with the catalytic activity of the commercial samples for most of TiO 2 powders investigated. The lower the IEP of the TiO 2 , the lower the bacterial inactivation activity. By electron microscopy it is shown that the clusters of TiO 2 Degussa P-25 are only in partial contact with E. coli K-12 (diameter 1 μm). The reasons for this behavior are discussed in terms of the interaction of the E. coli with TiO 2 .
Applied Catalysis B: Environmental – Elsevier
Published: Mar 22, 2006
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