School of Environment & Natural Resources, Renmin University of China, Beijing 100872, PR China.
School of Environment & Natural Resources, Renmin University of China, Beijing 100872, PR China.
Environ Pollut. 2018 Jun;237:452-459. doi: 10.1016/j.envpol.2018.02.074. Epub 2018 Mar 15.
The presence of pathogenic microorganisms in water is a great threat to human health, and photocatalysis 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-TiO nanofibers under visible light was investigated. The result showed that the prepared Cu-TiO 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 photocatalytic 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.
水中致病微生物的存在对人类健康构成了巨大威胁，光催化在消毒方面具有广阔的前景。然而，可见光光催化灭活病毒的研究仍有限，特别是在病毒与其宿主细菌共存的情况下。在本研究中，噬菌体 f2 和其宿主大肠杆菌 285 被用作模型微生物，研究了制备的 Cu-TiO 纳米纤维在可见光下的消毒性能。结果表明，所制备的 Cu-TiO 纳米纤维在可见光下对噬菌体 f2 和大肠杆菌 285 的去除具有出色的能力。一系列实验表明，初始 pH 值对光催化消毒性能的影响不大。在一定范围内，噬菌体 f2 的去除效率随着催化剂用量、光强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 比大肠杆菌 285 对光催化氧化表现出更强的抵抗力，噬菌体 f2 的去除明显受到与大肠杆菌 285 混合的影响，而与噬菌体 f2 混合后，大肠杆菌 285 的去除几乎保持不变。进一步的研究证明，混合体系中的竞争吸附在大肠杆菌 285 的失活中起到了一定的作用，而在体相中的游离活性氧物种（ROSs）在噬菌体 f2 的失活中起着关键作用。
