Efficient destruction of pathogenic bacteria with AgBr/TiO2 under visible light irradiation

被引：88

作者：

Lan, Yongqing ^{[1
]}

Hu, Chun ^{[1
]}

Hu, Xuexiang ^{[1
]}

Qu, Jiuhui ^{[1
]}

机构：

[1] Chinese Acad Sci, Ecoenvironm Sci Res Ctr, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2007年 / 73卷 / 3-4期

基金：

中国国家自然科学基金;

关键词：

bactericidal mechanism; interaction of bacteria-catalyst; pathogenic bacteria; visible light-driven;

D O I：

10.1016/j.apcatb.2007.01.004

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 [物理化学]; 081704 [应用化学];

摘要：

The photocatalytic inactivation of pathogenic bacteria in water was investigated systematically with AgBr/TiO2 under visible light (lambda > 420 nm) irradiation. The catalyst was found to be highly effective for the killing of Escherichia coli, a Gram-negative bacterium, and Staphylococcus aureus, a Gram-positive bacterium. The decomposition of the cell wall and cell membrane was directly observed by TEM and further confirmed by K+ leakage from the inactivated bacteria. A possible cell damage mechanism by visible light-driven AgBr/TiO2 is proposed. In addition, the effects of pH, inorganic ions on bacterial photocatalytic inactivation were investigated. The electrostatic force interaction of the bacteria-catalyst is crucial for the efficiency of disinfection. Moreover, AgBr/TiO2 Supported on porous nickel showed much higher bactericidal activity than fixed P25 TiO2 under visible or near UV light irradiation. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：354 / 360

页数：7

共 26 条

[1]

Visible-light photocatalysis in nitrogen-doped titanium oxides [J].