期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 399, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.123017
关键词
ZnO-SnO2-Zn2SnO4; Tetradecahedral; Photocatalysts; Antibacterial activity; Double Z-scheme heterojunction
资金
- NSFC, PR China [51808199, U1604137, 21677047]
- China Postdoctoral Science Foundation, PR China [2018M630825, 2019T120624]
- Plan for University Scientific Innovative people of Henan Province, PR China [19HASTIT046]
Visible light-responsive tetradecahedral ZnO-SnO2-Zn2SnO4 photocatalysts possessing double Z-scheme mechanism were prepared via a hydrothermal pathway and subsequent annealing treatment. Due to its enhanced optical absorption ability and effective charge separation, the sample with a Zn/Sn atom ratio of 3:2 (Z32) exhibited superior degradation of the antibiotics ciprofloxacin and sulfamonomethoxine under visible light irradiation and also degraded bisphenol A. Furthermore, five-cycle experiments confirmed that Z32 also exhibited satisfactory photostability. The trapping experiment and electron spin resonance data demonstrated that both (OH)-O-center dot and O-2(center dot-) play important roles in the photocatalytic system, where electron transfer coincides with the double Z-scheme mechanism. Photo-generated electrons in the conduction band (CB) of ZnO can transfer to the valence band (VB) of Zn2SnO4, while electrons in the CB of SnO2 transfer to the VB of ZnO, as a result of the intimatecontact, chemically-bound interface. Therefore, the reduction and oxidation reactions occur at higher reduction and oxidation potentials, producing reactions that can successfully eliminate the biotoxicity of antibiotics to Escherichia coli DH5a after photocatalytic degradation by Z32.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据