High-performance photocatalytic decomposition of PFOA by BiOX/TiO₂ heterojunctions: Self-induced inner electric fields and band alignment.
Date
2022
Authors
Liu, X.
Duan, X.
Bao, T.
Hao, D.
Chen, Z.
Wei, W.
Wang, D.
Wang, S.
Ni, B.-J.
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Journal article
Citation
Journal of Hazardous Materials, 2022; 430
Statement of Responsibility
Xiaoqing Liu, Xiaoguang Duan, Teng Bao, Derek Hao, Zhijie Chen, Wei Wei, Dongbo Wang, Shaobin Wang, Bing-Jie Ni
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Abstract
BiOX (X = Cl, Br and I) and BiOX/TiO2 photocatalysts were prepared by a facile hydrothermal approach. The BiOX/TiO2 heterojunctions demonstrated significantly enhanced efficiency for photocatalytic decomposition of perfluorooctanoic acid (PFOA) compared with sole BiOX or TiO2. PFOA (10 mg L–1) was completely degraded by BiOCl(Br)/TiO2 in 8 h. Moreover, BiOCl/TiO2 attained deep decomposition of PFOA with a high defluorination ratio of 82%. The p-n heterojunctions between BiOX and TiO2 were confirmed by a series of characterizations. The photo-induced holes would migrate from the valance band (VB) of TiO2 to BiOX, driven by the built-in electric field (BIEF) near the interfaces of p-n heterojunctions, the inner electric fields (IEF) in BiOX and the higher VB position of BiOX. The X-ray diffraction (XRD) and TEM characterizations indicated that TiO2 combined with BiOX along the [110] facet, which facilitated photo-induced electron transfer in the [001] direction, thus benefiting PFOA decomposition.
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