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首页> 外文期刊>Environmental Science & Technology >Bactericidal Activity of a Ce-Promoted Ag/AlPO4 Catalyst Using Molecular Oxygen in Water
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Bactericidal Activity of a Ce-Promoted Ag/AlPO4 Catalyst Using Molecular Oxygen in Water

机译：Ce助Ag / AlPO4催化剂在水中使用分子氧的杀菌活性

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The catalytic inactivation of Escherichia coli in water by a cerium (Ce)-promoted silver-loaded aluminum phosphate (Ag/ AlPO_4) catalyst using molecular oxygen was investigated. With optimum Ce content, the Ag(Ce)/AlPO_4 catalyst exhibited strong bactericidal activity. The process of decomposition of the cell wall and cell membrane was directly observed by TEM. The different morphological changes of E. coli cells treated with the Ag(Ce)/AlPO_4 catalyst and those treated with Ag~+ suggested that the Ag~+ eluted from the catalyst surface did not play an important role during the bactericidal process. Results of DMPO spin-trapping measurements by electron spin resonance (ESR) indicated the formation of the reactive oxygen species (ROS) ·OH and ·O_2~-,which caused the considerable bactericidal activity. The formation of H_2O_2 acted as an important intermediate; this was confirmed by addition of catalase as the scavenger. A possible catalytic oxidation bactericidal mechanism using molecular oxygen was proposed for the Ag(Ce)/AlPO_4 catalyst.
机译：研究了由铈（Ce）促进的载银磷酸铝（Ag / AlPO_4）催化剂使用分子氧对水中的大肠杆菌的催化失活。以最佳的Ce含量，Ag（Ce）/ AlPO_4催化剂表现出很强的杀菌活性。用TEM直接观察细胞壁和细胞膜的分解过程。用Ag（Ce）/ AlPO_4催化剂处理的大肠杆菌细胞和用Ag〜+处理的大肠杆菌细胞的形态变化不同，表明从催化剂表面洗脱的Ag〜+在杀菌过程中没有发挥重要作用。通过电子自旋共振（ESR）对DMPO自旋俘获的测量结果表明，活性氧（ROS）·OH和·O_2〜-的形成，引起了相当大的杀菌活性。 H_2O_2的形成是重要的中间体。通过添加过氧化氢酶作为清除剂证实了这一点。针对Ag（Ce）/ AlPO_4催化剂，提出了一种利用分子氧的催化氧化杀菌机理。

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