李伟英教授课题组        厚德载物 济水知源

Chlorine-Resistant Bacteria Sterilization and Trichloroacetic Acid Degradation Performance

Author: Wei Zhou, Lin Fu, Long Zhao,Xiaojuan Xu, Weiying Li, Ming Wen, and Qingsheng Wu

Abstract: In order to solve two issuesof chlorine-resistant bacteria (CRB) and disinfection byproducts (DBPs) in tapwater after the chlorine-containing treatment process, an innovative core−sheathnanostructured Cu/Cu2O-ZnO-Fe3O4 was designedand synthesized. The fabrication mechanism of the materials was then systematicallyanalyzed to determine the component and valence state. The properties of CRBinactivation together with trichloroacetic acid (TCAA) photodegradation byCu/Cu2O-ZnO-Fe3O4 were investigated in detail.It was found that Cu/Cu2O-ZnO-Fe3O4 displayed excellentantibacterial activity with a relatively low cytotoxicity concentration due toits synergism of nanowire structure, ion release, and reactive oxygen speciesgeneration. Furthermore, the Cu/Cu2O-ZnO-Fe3O4nanocomposite also exhibited outstanding photocatalytic degradation activity onTCAA under simulated sunlight irradiation, which was verified to be dominatedby the surface reaction through kinetic analysis. More interestingly, the cellgrowth rate of Cu/Cu2O-ZnO-Fe3O4 wasdetermined to be 50% and 10% higher than those of Cu/Cu2O and Cu/Cu2O-ZnOafter 10 h incubation, respectively, manifesting a weaker cytotoxicity.Therefore, the designed Cu/Cu2O-ZnO-Fe3O4could be a promising agent for tap water treatment.

摘要翻译:一种创新型的芯鞘纳米结构Cu/Cu2O-ZnO-Fe3O4材料被设计和合成用于一箭双雕地解决饮用水因氯消毒引起的耐氯细菌与消毒副产物的问题。材料的合成机理被系统地分析用以获得各种组成与价态。同时详细地对耐氯细菌额灭活和对三氯乙酸的降解性能进行研究。解雇显示该材料在较低的毒性浓度下显示出优秀的杀菌性能,其归因于材料的纳米纤维结构、离子释放以及活性氧的生成。与此同时,该纳米材料在模拟日光下,展现出优异的三氯乙酸降解性能,并通过动力学分析验证了这一活性主要由表面反应决定。更有趣的是,在性能作用浓度范围内,加入Hela细胞培养液培养10 h后,Cu/Cu2O-ZnO-Fe3O4的细胞生长速率分别比Cu/Cu2OCu/Cu2O-ZnO的细胞生长速率高50%10%,展现出其较低的细胞毒性。因此,所设计的Cu/Cu2O-ZnO-Fe3O4是一种很有前途的自来水处理剂。

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