纳米片
纳米棒
材料科学
X射线光电子能谱
异质结
电极
复合数
氧化锡
可见光谱
扫描电子显微镜
化学工程
纳米技术
兴奋剂
化学
光电子学
复合材料
工程类
物理化学
作者
Sen Liu,Mintao Zhao,Zetian He,Yi Zhong,Hao Ding,Daimei Chen
出处
期刊:Chinese Journal of Catalysis
[China Science Publishing & Media Ltd.]
日期:2019-03-01
卷期号:40 (3): 446-457
被引量:66
标识
DOI:10.1016/s1872-2067(18)63186-9
摘要
In this study, a 2D BiOI nanosheet/1D BiPO4 nanorod/fluorine-doped tin oxide (FTO) composite electrode with a p-n heterojunction structure was prepared by a two-step electrodeposition method. Field-emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, UV-visible diffuse reflectance spectroscopy, and electrochemical testing were used to characterize its composition, crystal morphology, and optical properties. The BiOI/BiPO4/FTO composite electrode has higher photoelectrocatalytic (PEC) activity for the degradation of tetracycline than pure BiPO4 and BiOI. The PEC activity of the composite was 1.98 times and 2.46 times higher than those of the BiOI/FTO and BiPO4/FTO electrodes, respectively. The effects of the working voltage and BiOI deposition time on the degradation of tetracycline were investigated. The optimum BiOI deposition time was found to be 150 s and the optimum working voltage is 1.2 V. Trapping experiments showed that hydroxyl radicals (•OH) and superoxide radicals (•O2−) are the major reactive species in the PEC degradation process. The BiOI/BiPO4/FTO composite electrode has good stability, and the tetracycline removal efficiency remains substantially unchanged after four cycles in a static system. The reason for the PEC efficiency enhancement in the BiOI/BiPO4/FTO composite electrode is the increased visible light absorption range and the p-n heterojunction structure, which promotes the separation and migration of the photogenerated electrons and holes.
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