| Abstract
| - The bactericidal process of Ag/Al2O3 to Escherichia coli has been investigated to clarify the bactericidal mechanism.In SEM images, the configuration of E. coli cells contacting with the catalyst surface was quite different from thatcontacting with AgNO3 solution, which indicated that the Ag+ eluted from the catalyst did not play an important rolein the bactericidal process. The bactericidal experiments strongly confirmed the contribution of multiform reactiveoxygen species (ROS) (super oxide dismutase (SOD) and catalase as the scavengers for O2•- and H2O2, respectively)to bactericidal effect on the catalyst surface. Furthermore, the surface modification of Ag/Al2O3 by ultraviolet andformaldehyde influenced the bactericidal effect obviously, which not only confirmed the bactericidal mechanism ofcatalytic oxidation but also provided evidence for the synergistic effect between Ag and Al2O3 on the catalyst surface.
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