Morphology-dependent bactericidal activities of Ag/CeO2 catalysts against Escherichia coli
文献类型：期刊论文
| 作者 | Wang, Lian ; He, Hong ; Yu, Yunbo ; Sun, Li ; Liu, Sijin ; Zhang, Changbin ; He, Lian |
| 刊名 | JOURNAL OF INORGANIC BIOCHEMISTRY
 |
| 出版日期 | 2014 |
| 卷号 | 135期号:1页码:45-53 |
| 关键词 | Silver CeO2 Bactericidal activity E. coli ROS |
| ISSN号 | 0162-0134 |
| 中文摘要 | Silver-loaded CeO2 nanomaterials (Ag/CeO2) including Ag/CeO2 nanorods, nanocubes, nanoparticles were prepared with hydrothermal and impregnation methods. Catalytic inactivation of Escherichia coli with Ag/CeO2 catalysts through the formation of reactive oxygen species (ROS) was investigated. For comparison purposes, the bactericidal activities of CeO2 nanorods, nanocubes and nanoparticles were also studied. There was a 3-4 log order improvement in the inactivation of E. coli with Ag/CeO2 catalysts compared with CeO2 catalysts. Temperature-programmed reduction of H-2 showed that Ag/CeO2 catalysts had higher catalytic oxidation ability than CeO2 catalysts, which was the reason for that Ag/CeO2 catalysts exhibited stronger bactericidal activities than CeO2 catalysts. Further, the bactericidal activities of CeO2 and Ag/CeO2 depend on their shapes. Results of 5,5-dimethy1-1-pyrroline-N-oxide spin-trapping measurements by electron spin resonance and addition of catalase as a scavenger indicated the formation of center dot OH, center dot O-2(-), and H2O2, which caused the obvious bactericidal activity of catalysts. The stronger chemical bond between Ag and CeO2 nanorods led to lower Ag+ elution concentrations. The toxicity of Ag eluted from the catalysts did not play an important role during the bactericidal process. Experimental results also indicated that Ag/CeO2 induced the production of intracellular ROS and disruption of the cell wall and cell membrane. A possible production mechanism of ROS and bactericidal mechanism of catalytic oxidation were proposed. (C) 2014 Elsevier Inc. All rights reserved. |
| WOS记录号 | WOS:000335430200006 |
| 公开日期 | 2015-03-24 |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/9283]  |
| 专题 | 生态环境研究中心_大气污染控制中心 |
| 推荐引用方式 GB/T 7714 | Wang, Lian,He, Hong,Yu, Yunbo,et al. Morphology-dependent bactericidal activities of Ag/CeO2 catalysts against Escherichia coli[J]. JOURNAL OF INORGANIC BIOCHEMISTRY,2014,135(1):45-53. |
| APA | Wang, Lian.,He, Hong.,Yu, Yunbo.,Sun, Li.,Liu, Sijin.,...&He, Lian.(2014).Morphology-dependent bactericidal activities of Ag/CeO2 catalysts against Escherichia coli.JOURNAL OF INORGANIC BIOCHEMISTRY,135(1),45-53. |
| MLA | Wang, Lian,et al."Morphology-dependent bactericidal activities of Ag/CeO2 catalysts against Escherichia coli".JOURNAL OF INORGANIC BIOCHEMISTRY 135.1(2014):45-53. |
入库方式： OAI收割
来源：生态环境研究中心
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