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Decoration of Fe3O4 base material with Ag/AgCl nanoparticle as recyclable visible-light driven photocatalysts for highly-efficient photocatalytic disinfection of Escherichia coli
Solid State Sciences ( IF 3.5 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.solidstatesciences.2020.106159
Hongliang Wang , Huixian Shi , Haishuai Li , Xin Tian , Zhifang Wu , Sijin Li

Abstract Effective and environmental water disinfectants are of great importance to address increasing health concerns in drinking water. Hence, in present paper, a highly efficient, recyclable and magnetically separable nanoparticles Ag/AgCl/Fe3O4 was prepared, comprehensively characterized (SEM, TEM, XRD, XPS, UV–vis and PL) and investigated as photocatalytic disinfectants for Escherichia coli K-12 (E. coli K-12). And the Ag/AgCl/Fe3O4 nanocomposites exhibited excellent disinfection performance for eliminating E. coli K-12 under visible light irradiation, with a maximum inactivation rate of 9.1-log at 0.2 g L−1 in 60 min. Consistent disinfection performance was verified with five successive stability tests and reused five times without significant decrease in photocatalytic disinfection. The synergistic effects of Ag/AgCl andFe3O4 in the hybrid could also contribute to the improved photo stability and the reusability towards bacteria inactivation. The potential disinfection mechanism was investigated on the fluorescence assays, Cell morphology (SEM), TOC level and K+ leakage, and the results shown that the bacterial cell inactivation begins with the cell wall destruction with the leakage of the cellular components in the present photocatalytic system. Further photochemical investigation indicated that H+, OH and H2O2 were the crucial active species. These results demonstrated effectiveness and potential applications for the developed Ag/AgCl/Fe3O4 nanocomposites in waste water disinfection.

中文翻译:

用 Ag/AgCl 纳米粒子作为可回收的可见光驱动光催化剂装饰 Fe3O4 基材,用于高效光催化消毒大肠杆菌

摘要 有效和环保的水消毒剂对于解决饮用水中日益严重的健康问题非常重要。因此,在本文中,制备了一种高效、可回收且可磁分离的纳米粒子 Ag/AgCl/Fe3O4,对其进行了全面表征(SEM、TEM、XRD、XPS、UV-vis 和 PL),并将其作为大肠杆菌 K-的光催化消毒剂进行研究。 12(大肠杆菌K-12)。Ag/AgCl/Fe3O4 纳米复合材料在可见光照射下对大肠杆菌 K-12 的消除表现出优异的消毒性能,60 分钟内在 0.2 g L-1 下的最大灭活率为 9.1-log。通过五次连续稳定性测试验证了一致的消毒性能,并重复使用五次,而光催化消毒没有显着降低。Ag/AgCl 和 Fe3O4 在杂化物中的协同作用也有助于提高光稳定性和细菌灭活的可重复使用性。通过荧光分析、细胞形态学 (SEM)、TOC 水平和 K+ 泄漏研究了潜在的消毒机制,结果表明细菌细胞失活始于细胞壁破坏和本光催化系统中细胞成分的泄漏. 进一步的光化学研究表明,H+、OH 和 H2O2 是关键的活性物质。这些结果证明了开发的 Ag/AgCl/Fe3O4 纳米复合材料在废水消毒中的有效性和潜在应用。通过荧光分析、细胞形态学 (SEM)、TOC 水平和 K+ 泄漏研究了潜在的消毒机制,结果表明细菌细胞失活始于细胞壁破坏和本光催化系统中细胞成分的泄漏. 进一步的光化学研究表明,H+、OH 和 H2O2 是关键的活性物质。这些结果证明了开发的 Ag/AgCl/Fe3O4 纳米复合材料在废水消毒中的有效性和潜在应用。通过荧光分析、细胞形态学 (SEM)、TOC 水平和 K+ 泄漏研究了潜在的消毒机制,结果表明细菌细胞失活始于细胞壁破坏和本光催化系统中细胞成分的泄漏. 进一步的光化学研究表明,H+、OH 和 H2O2 是关键的活性物质。这些结果证明了开发的 Ag/AgCl/Fe3O4 纳米复合材料在废水消毒中的有效性和潜在应用。进一步的光化学研究表明,H+、OH 和 H2O2 是关键的活性物质。这些结果证明了开发的 Ag/AgCl/Fe3O4 纳米复合材料在废水消毒中的有效性和潜在应用。进一步的光化学研究表明,H+、OH 和 H2O2 是关键的活性物质。这些结果证明了开发的 Ag/AgCl/Fe3O4 纳米复合材料在废水消毒中的有效性和潜在应用。
更新日期:2020-04-01
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