High-performance photocatalytic decomposition of PFOA by BiOX/TiO2 heterojunctions: Self-induced inner electric fields and band alignment.

Liu, X; Duan, X; Bao, T; Hao, D; Chen, Z; Wei, W; Wang, D; Wang, S; Ni, B-J

High-performance photocatalytic decomposition of PFOA by BiOX/TiO2 heterojunctions: Self-induced inner electric fields and band alignment.

Liu, X Duan, X Bao, T Hao, D Chen, Z

Wei, W

Wang, D Wang, S Ni, B-J

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Publisher:: ELSEVIER
Publication Type:: Journal Article
Citation:: J Hazard Mater, 2022, 430, pp. 128195
Issue Date:: 2022-05-15

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Field	Value	Language
dc.contributor.author	Liu, X
dc.contributor.author	Duan, X
dc.contributor.author	Bao, T
dc.contributor.author	Hao, D
dc.contributor.author	Chen, Z https://orcid.org/0000-0003-0627-0856
dc.contributor.author	Wei, W https://orcid.org/0000-0001-5613-337X
dc.contributor.author	Wang, D
dc.contributor.author	Wang, S
dc.contributor.author	Ni, B-J
dc.date.accessioned	2023-03-23T21:54:35Z
dc.date.available	2021-12-29
dc.date.available	2023-03-23T21:54:35Z
dc.date.issued	2022-05-15
dc.identifier.citation	J Hazard Mater, 2022, 430, pp. 128195
dc.identifier.issn	0304-3894
dc.identifier.issn	1873-3336
dc.identifier.uri	http://hdl.handle.net/10453/168236
dc.description.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 L1) 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.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	ELSEVIER
dc.relation	http://purl.org/au-research/grants/arc/FT160100195
dc.relation	http://purl.org/au-research/grants/arc/DE220100530
dc.relation.ispartof	J Hazard Mater
dc.relation.isbasedon	10.1016/j.jhazmat.2021.128195
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	03 Chemical Sciences, 05 Environmental Sciences, 09 Engineering
dc.subject.classification	Strategic, Defence & Security Studies
dc.title	High-performance photocatalytic decomposition of PFOA by BiOX/TiO2 heterojunctions: Self-induced inner electric fields and band alignment.
dc.type	Journal Article
utslib.citation.volume	430
utslib.location.activity	Netherlands
utslib.for	03 Chemical Sciences
utslib.for	05 Environmental Sciences
utslib.for	09 Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	closed_access	*
dc.date.updated	2023-03-23T21:54:34Z
pubs.publication-status	Published
pubs.volume	430

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 L1) 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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http://hdl.handle.net/10453/168236