Bactericidal mechanism of Ag/Al2O3 against Escherichia coli

被引：58

作者：

Chang, Qingyun ^{[1
]}

Yan, Lizhu ^{[1
]}

Chen, Meixue ^{[1
]}

He, Hong ^{[1
]}

Qu, Jiuhui ^{[1
]}

机构：

[1] Chinese Acad Sci, Ecoenvironm Sci Res Ctr, Beijing 100085, Peoples R China

来源：

LANGMUIR | 2007年 / 23卷 / 22期

关键词：

D O I：

10.1021/la701006r

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 that contacting with AgNO3 solution, which indicated that the Ag+ eluted from the catalyst did not play an important role in the bactericidal process. The bactericidal experiments strongly confirmed the contribution of multiform reactive oxygen species (ROS) (super oxide dismutase (SOD) and catalase as the scavengers for O-2 center dot(-) and H2O2, respectively) to bactericidal effect on the catalyst surface. Furthermore, the surface modification of Ag/Al2O3 by ultraviolet and formaldehyde influenced the bactericidal effect obviously, which not only confirmed the bactericidal mechanism of catalytic oxidation but also provided evidence for the synergistic effect between Ag and Al2O3 on the catalyst surface.

引用

页码：11197 / 11199

页数：3

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