Photocatalytic disinfection performance in virus and virus/bacteria system by Cu-TiO2 nanofibers under visible light
Photocatalytic disinfection performance in virus and virus/bacteria system by Cu-TiO2 nanofibers under visible light
复制标题
可见光下Cu-TiO2纳米纤维对病毒及病毒/细菌系统的光催化消毒性能
DOI：
10.1016/j.envpol.2018.02.074
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发表时间：
2018-06-01
影响因子：
8.9
通讯作者：
Yuan, Dong-hai
中科院分区：
文献类型：
--
作者：
Zheng, Xiang;Shen, Zhi-peng;Yuan, Dong-hai
水中致病微生物的存在对人类健康构成了极大的威胁，光催化技术在消毒方面具有广阔的应用前景。然而，可见光催化灭活病毒的研究还很有限，尤其是病毒与宿主细菌共存的情况。本研究以噬菌体f2及其宿主大肠杆菌285为模式微生物，研究了制备的铜-二氧化钛纳米纤维在可见光下的杀菌性能。结果表明，所制备的铜-二氧化钛纳米纤维在可见光下对f2噬菌体和大肠杆菌285具有良好的去除能力。系列实验表明，初始pH值对光催化杀菌性能影响不大。在一定范围内，f2噬菌体的去除效率随着催化剂用量、光照强度和温度的增加而增加，但随着初始病毒浓度的增加而降低。在病毒/细菌混合体系中，噬菌体f2的抗光催化氧化能力强于285噬菌体，与285噬菌体混合后对f2噬菌体的去除有明显的影响，而与f2噬菌体混合后对285噬菌体的去除几乎没有影响。进一步的研究证明，混合体系中的竞争吸附对E.Coli285的灭活起到了一定的作用，而体相中的自由活性氧物种(ROSS)对噬菌体f2的灭活起着关键作用。(C)2018爱思唯尔有限公司。保留所有权利。
The presence of pathogenic microorganisms in water is a great threat to human health, and photo catalysis is promising for disinfection. However, the research on virus inactivation with visible-light photocatalysis is still limited, especially the coexistence of virus and its host bacteria. In this study, bacteriophage f2 and its host E. coil 285 were used as the model microorganisms, and the disinfection performance of prepared Cu-TiO2 nanofibers under visible light was investigated. The result showed that the prepared Cu-TiO2 nanofibers showed a brilliant ability in terms of removing bacteriophage f2 and E. coil 285 under visible light. Series experiments indicated that the initial pH didn't affect the photo catalytic disinfection performance significantly. In the certain range, the removal efficiency of bacteriophage f2 increased with the increase of catalyst dosage, light intensity and temperature, but decreased with the increase of initial virus concentration. In virus/bacteria mixed system, bacteriophage f2 exhibited stronger resistance to photocatalytic oxidation than E. coil 285, and the removal of bacteriophage f2 was obviously affected by being mixed with E. coil 285, while the removal of E. coil 285 almost remained unchanged after being mixed with bacteriophage f2. Further research proved that competitive adsorption in mixed system played a certain role in E. coli 285 inactivation, while the free reactive oxygen species (ROSS) in the bulk phase played a crucial role in phage f2 inactivation. (C) 2018 Elsevier Ltd. All rights reserved.