Photodegradation of 2,4-dichlorophenol and rhodamine B over n-type ZnO/p-type BiFeO3 heterojunctions: detailed reaction pathway and mechanism
Photodegradation of 2,4-dichlorophenol and rhodamine B over n-type ZnO/p-type BiFeO3 heterojunctions: detailed reaction pathway and mechanism
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n型ZnO/p型BiFeO3异质结上2,4-二氯苯酚和罗丹明B的光降解：详细反应途径和机制
DOI：
10.1007/s11356-019-05079-0
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发表时间：
2019-04
影响因子：
5.8
通讯作者：
Wei Luo
中科院分区：
文献类型：
--
作者：
Muhammad Humayun;Zhiping Zheng;Qiuyun Fu;Wei Luo
The development of new technologies for efficient degradation of pollutant has been an increasing demand in the globe due to the serious environmental issues. Herein, we report n-type ZnO/p-type BiFeO3composites as highly efficient visible light nanophotocatalysts prepared via a wet chemical solution method. Based on the measurements of•OH-related fluorescence (FL) spectra, photoluminescence (PL) spectra, photoelectrochemical I-V curves, and electrochemical impedance spectra (EIS), it is demonstrated that the photo-induced charge carrier (electron-hole pairs) in the as-prepared n-type ZnO/p-type BiFeO3composites with proper amount of the coupled ZnO (10% by mass) exhibits high separation compared with the bare BiFeO3(BFO) nanoparticles. This is well responsible for the superior visible light photocatalytic performance of the composites for 2,4-dichlorophenol (2,4-DCP) and rhodamine B (RhB) degradation. It is confirmed by means of scavenger test and liquid chromatography-tandem mass spectrometry (LC/MS) analysis of the intermediate products that•OH is the pre-dominant oxidant involved in the degradation of 2,4-DCP. A detailed reaction pathway for 2,4-dichlorophenol degradation over the amount-optimized ZnO/BFO composite is proposed mainly based on the LC/MS product ions. This work will provide a feasible route to design and develop BFO-based highly efficient visible light-active photocatalysts for environmental purification and could be extended to other visible light-active semiconductor materials.
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