Visible-light-driven photodegradation of rhodamine B on Ag-modified BiOBr
Visible-light-driven photodegradation of rhodamine B on Ag-modified BiOBr
Ag-modified BiOBr composite photocatalysts were prepared via a simple phase-transfer methodology and used for cleanup of Rhodamine B (RhB) aqueous solution under visible light irradiation. X-ray diffraction, ultraviolet-visible diffuse reflectance spectra (UV-Vis-DRS) and high resolution X-ray photoelectron spectra characterizations confirmed the Ag-modification significantly affected the optical property, structures and reactivity of the BiOBr-based photocatalysts. In the Ag-modification process, a large portion of Ag+ may extract Br1- from BiOBr and the as-formed AgBr epitaxially located along the {102} crystal surface of BiOBr. The rest Ag+ will be either photo-reduced by methanol into Ag-0 or form Ag2O. In nature, the Ag-modified BiOBr materials are multi-junction photocatalysts of Ag/Ag2O/AgBr/BiOBr. The Ag-modification can greatly enhance the absorption of visible light but deteriorates the photocatalytic activity in comparison to the primitive BiOBr in visible-light-driven photodegradation of RhB. The activity of RhB photodegradation on such catalysts is inversely proportional to AgBr loading within 0.2-2.0 wt% region. Such unusual photocatalytic performance was tentatively attributed to the special band structure of the materials.
visible light, photocatalysis, BiOBr, ag modification, rhodamine b
771-778
Lu, Lufeng
a1560388-3ca2-4f0d-a95b-a2f09c4be9f3
Kong, Liang
3098eb13-8e15-4a85-a69a-65a5265a01c8
Jiang, Zheng
bcf19e78-f5c3-48e6-802b-fe77bd12deab
Lai, Henry H.C.
d73b12fe-bf5b-48f4-b0a2-fd45ff382ea2
Xiao, Tiancun
90161b4f-4483-4b4f-8db6-6614b001ac54
Edwards, Peter P.
1c8ab595-549c-4dca-b911-a46a94183e2b
June 2012
Lu, Lufeng
a1560388-3ca2-4f0d-a95b-a2f09c4be9f3
Kong, Liang
3098eb13-8e15-4a85-a69a-65a5265a01c8
Jiang, Zheng
bcf19e78-f5c3-48e6-802b-fe77bd12deab
Lai, Henry H.C.
d73b12fe-bf5b-48f4-b0a2-fd45ff382ea2
Xiao, Tiancun
90161b4f-4483-4b4f-8db6-6614b001ac54
Edwards, Peter P.
1c8ab595-549c-4dca-b911-a46a94183e2b
Lu, Lufeng, Kong, Liang, Jiang, Zheng, Lai, Henry H.C., Xiao, Tiancun and Edwards, Peter P.
(2012)
Visible-light-driven photodegradation of rhodamine B on Ag-modified BiOBr.
Catalysis Letters, 142 (6), .
(doi:10.1007/s10562-012-0824-2).
Abstract
Ag-modified BiOBr composite photocatalysts were prepared via a simple phase-transfer methodology and used for cleanup of Rhodamine B (RhB) aqueous solution under visible light irradiation. X-ray diffraction, ultraviolet-visible diffuse reflectance spectra (UV-Vis-DRS) and high resolution X-ray photoelectron spectra characterizations confirmed the Ag-modification significantly affected the optical property, structures and reactivity of the BiOBr-based photocatalysts. In the Ag-modification process, a large portion of Ag+ may extract Br1- from BiOBr and the as-formed AgBr epitaxially located along the {102} crystal surface of BiOBr. The rest Ag+ will be either photo-reduced by methanol into Ag-0 or form Ag2O. In nature, the Ag-modified BiOBr materials are multi-junction photocatalysts of Ag/Ag2O/AgBr/BiOBr. The Ag-modification can greatly enhance the absorption of visible light but deteriorates the photocatalytic activity in comparison to the primitive BiOBr in visible-light-driven photodegradation of RhB. The activity of RhB photodegradation on such catalysts is inversely proportional to AgBr loading within 0.2-2.0 wt% region. Such unusual photocatalytic performance was tentatively attributed to the special band structure of the materials.
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Published date: June 2012
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Times Cited: 0
Keywords:
visible light, photocatalysis, BiOBr, ag modification, rhodamine b
Organisations:
Faculty of Engineering and the Environment
Identifiers
Local EPrints ID: 352797
URI: http://eprints.soton.ac.uk/id/eprint/352797
ISSN: 1011-372X
PURE UUID: 3fb74869-5991-46da-abd2-13dbfe80a80c
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Date deposited: 21 May 2013 11:42
Last modified: 15 Mar 2024 03:47
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Author:
Lufeng Lu
Author:
Liang Kong
Author:
Henry H.C. Lai
Author:
Tiancun Xiao
Author:
Peter P. Edwards
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