Disruption of Bacterial Cells by Photocatalysis of Montmorillonite Supported Titanium Dioxide  

作　　者：雷绍民 

机构地区：[1]School of Resources and Environmental Engineering,Wuhan University of Technology

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2009年第4期557-561,共5页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National "973" Program of MOST of China (No.2004CB619204);the Scientific and Technological Research Key Project,Ministry of Education of China (No. 02052);the National High Tech. "863"Program of China (No. 2007AA06Z100 );the Scientific and Technological Research Key Project (No. 2007AA06Z123 )

摘　　要：The photo-induced antibacterial capacity of montmorillonite supported titanium dioxide （TiO2/Mmt for short） was evaluated by using Escherichia coli and Staphylococcus aureus as modal organims. The bactericidal activity of TiO2/Mmt was examined by cell viability assay under different illumination modes. Atomic force microscopy （AFM） and total organic carbon/Total nitrogen （TOC/TN） analyses were employed to investigate the mechanism of the photocatalytic bactericidal process qualitatively and quantitatively. The kinetic data show that TiO2/Mmt has excellent antibacterial performance, and about 99% of both bacteria cells are inactivated within 75 rain illumination. The AFM images demonstrate that the bacterial cells are irreversibly decomposed and some cell components are dissolved. Therefore, the content and phase of carbon and nitrogen in the solution are changed after photocatalytic reaction.The photo-induced antibacterial capacity of montmorillonite supported titanium dioxide （TiO2/Mmt for short） was evaluated by using Escherichia coli and Staphylococcus aureus as modal organims. The bactericidal activity of TiO2/Mmt was examined by cell viability assay under different illumination modes. Atomic force microscopy （AFM） and total organic carbon/Total nitrogen （TOC/TN） analyses were employed to investigate the mechanism of the photocatalytic bactericidal process qualitatively and quantitatively. The kinetic data show that TiO2/Mmt has excellent antibacterial performance, and about 99% of both bacteria cells are inactivated within 75 rain illumination. The AFM images demonstrate that the bacterial cells are irreversibly decomposed and some cell components are dissolved. Therefore, the content and phase of carbon and nitrogen in the solution are changed after photocatalytic reaction.

关 键 词：montmorillonite titanium dioxide photocatalytic antibacterial cell disruption TOC/TN 

分 类 号：TM910[电气工程—电力电子与电力传动]