异质结
材料科学
X射线光电子能谱
光催化
拉曼光谱
光谱学
辐照
光化学
反应速率常数
分析化学(期刊)
纳米技术
化学工程
光电子学
化学
光学
动力学
物理
色谱法
生物化学
量子力学
核物理学
工程类
催化作用
作者
Yujia Wang,Zhigang Zhang,Yijiang Chen,Zhengfa Zhu,Junhua Chen,Xiaoning Tang
标识
DOI:10.1016/j.ceramint.2023.12.247
摘要
Designing efficient antimicrobials for the rapid disinfection of water is increasingly critical owing to the rising threat of pathogenic microorganisms. In this study, direct Z-scheme Bi2WO6/TiO2 heterojunctions were constructed using a simple in situ hydrothermal method. The optimal Bi2WO6/TiO2 Z-scheme heterojunction inhibited 98.80 % of Escherichia coli (5 × 108 CFU·mL−1) at 0.35 mg·mL−1 and 99.33 % of Staphylococcus aureus (5 × 108 CFU·mL−1) at 0.5 mg·mL−1 after 10 min of light-emitting diode (LED) light irradiation. Furthermore, in antibiotic degradation experiments, Bi2WO6/TiO2 had a 92.91 % removal rate for ciprofloxacin with a pseudo-second-order degradation rate constant (k) of 0.056 min−1 after 240 min of irradiation. The antibacterial mechanism of Bi2WO6/TiO2 was systematically investigated and confirmed to occur by LED light-driven surface activation and efficient charge transfer. The surface and interfacial structures of the Bi2WO6/TiO2 samples were studied by high-resolution transmission electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy. The antibacterial mechanism was studied by controlled experiments and electron spin resonance analyses, which revealed that the primary antibacterial mechanism of Bi2WO6/TiO2 is oxidative sterilisation via generated reactive oxygen species. Time-resolved fluorescence spectroscopy was used to analyse the charge-transfer pathway in Bi2WO6/TiO2, which demonstrated that the spatial separation of the redox-active sites extended the lifetimes of the photogenerated carriers, enhancing the oxidative destruction of bacteria. This comprehensive understanding paves the way for the design of new Z-type heterojunction photocatalytic materials for antimicrobial applications.
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