CuI-BiOI/Cu film for enhanced photo-induced charge separation and visible light antibacterial activity
CuI-BiOI/Cu film for enhanced photo-induced charge separation and visible light antibacterial activity
复制标题
CuI-BiOI/Cu 薄膜可增强光致电荷分离和可见光抗菌活性
DOI：
10.1016/j.apcatb.2018.05.001
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Wang Xuxu
中科院分区：
文献类型：
--
作者：
Zhang Yiqiu;Lin Chen;Lin Qun;Jin Yubo;Wang Yonghao;Zhang Zizhong;Lin Huaxiang;Long Jinlin;Wang Xuxu
CuI-BiOI/Cu薄膜对大肠杆菌具有良好的光催化灭活作用。采用透射电镜、扫描电镜、X射线衍射、X射线光电子能谱和动态光散射等手段对可见光驱动下的光催化灭活大肠杆菌进行了表征。研究了CuI、BiOI、CuI-BiOI和CuI-BiOI/Cu膜的电化学性能。结果表明，CuI-BiOI/Cu膜具有最佳的杀菌效果，光照2 h后，活菌数几乎可以恢复到原来的水平。激光扫描共聚焦显微镜（LSCM）观察发现，细菌在可见光照射后形态发生了很大变化，紫外光谱证实了细菌蛋白质的泄漏。利用光电化学技术和不同活性物种的清除剂研究了其抗菌机理，结果表明，活性物种对抗菌活性的影响顺序为h+> e−> H2 O2> dotHO> dotO 2 −. CuI和Cu在分离h+和e−中起重要作用。在光催化过程中，CuI-BiOI异质结构中CuI作为空穴传输通道，Cu作为电子传递通道，促进了光生电荷的分离，提高了样品的光催化抗菌活性。
CuI-BiOI/Cu film with effective photocatalytic inactivation of E. coli under visible-light-driven (VLD) were prepared on copper sheet and were characterized by TEM, SEM, XRD, XPS and DRS. The photocatalytic inactivation of E. coli of CuI, BiOI, CuI-BiOI and CuI-BiOI/Cu film were investigated. The results showed that CuI-BiOI/Cu film exhibit the most excellent bacteria disinfection activity, and the quantity of viable bacteria could almost inactivate after being illuminated for 2 h. The Laser Scanning Confocal Microscopy (LSCM) observation exhibits that the morphology of bacteria changed a lot after visible light irradiation, and the UV spectra confirm the leakage of bacterial protein. The antibacterial mechanism was studied by employing photoelectrochemical techniques and scavengers of different reactive species, which reveals that the effect of reactive species on the antibacterial activity decrease in order h+> e−> H2O2> radical dotHO > radical dotO2−. The CuI and Cu play the important role in the separation of h+and e−. During the photocatalytic process, the CuI act as a hole-transport channel and the Cu act as electron transfer for CuI-BiOI heterostructure, which promotes the separation of photogenerated charges and enhances the photocatalytic antibacterial activity of the as-prepared samples.