光催化
异质结
光降解
表面等离子共振
降级(电信)
等离子体子
材料科学
光化学
化学工程
纳米颗粒
可见光谱
矿化(土壤科学)
催化作用
纳米技术
光电子学
化学
有机化学
电信
计算机科学
氮气
工程类
作者
Shijie Li,Chunchun Wang,Yanping Liu,Bing Xue,Wei Jiang,Yu Liu,Liuye Mo,Xiaobo Chen
标识
DOI:10.1016/j.cej.2021.128991
摘要
A novel Ag/Ag2S/Bi2MoO6 plasmonic p-n heterojunction has been constructed via the in-situ growth of p-type Ag2S nanoparticles on n-type Bi2MoO6 microspheres, followed by the photo-reduction treatment. Simultaneously, the Ag0 loading percentage in the heterojunction could be finely controlled by tuning the photo-reduction time. The optimized Ag/Ag2S/Bi2MoO6 (AAS/BMO-4) manifests the highest photocatalytic performance towards degrading levofloxacin (LEV) and tetracycline hydrochloride (TC), which degradation efficiencies are 87.3% and 92.8%, respectively. Such improvement mechanism could be due to the improved light absorption in the visible-light region induced by localized surface plasmon resonance (LSPR) and the efficient interfacial separation and transport of charge carriers in Ag/Ag2S/Bi2MoO6. The impacts of some key parameters (e.g., various inorganic anions, representative organic substances and various water resources) are systematically investigated. Ag/Ag2S/Bi2MoO6 also exhibits excellent mineralization capability and recycling performance in degrading LEV. Moreover, photo-generated h+, OH, and O2– are identified as the dominant reactive species accounting for the degradation of antibiotics. The photodegradation pathway of LEV has also been elucidated based on the intermediate identification. Therefore, this study not only reports an innovative plasmonic p-n heterojunction but also the new design of photocatalysts capable of efficiently degrading pharmaceutical antibiotics under visible-light irradiation.
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