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Photodegradation of Rhodamine B over Ag modified ferroelectric BaTiO3under simulated solar light: pathways and mechanism

Photodegradation of Rhodamine B over Ag modified ferroelectric BaTiO3under simulated solar light: pathways and mechanism
Photodegradation of Rhodamine B over Ag modified ferroelectric BaTiO3under simulated solar light: pathways and mechanism
The use of semiconductors with a ‘built in’ bias has now become of interest for a growing number of photoactive applications. Using a combination of spectroscopic techniques, gas chromatography in association with mass spectroscopy and NMR, we show that a sample of ferroelectric BaTiO3 decorated with nanostructured Ag denatures a standard dye molecule (Rhodamine B) via a photocatalytic oxidation mechanism. The photosensitized oxidation was inhibited due to band bending induced by ferroelectric polarisation. In the Ag–BaTiO3 system we find a slight hypsochromic wavelength shift during the initial stages of degradation (only 3 nm before 80% degradation percentage) and associate this shift with the cleavage of the chromophore structure which pre-empted deethylation. This shift in maximum absorption of the dye molecule did not occur until the later stages of molecule fragmentation. Our major identifiable breakdown intermediate was benzoic acid. A lack of other identifiable fragments during the breakdown of the dye is associated with retention of these fragments on the catalyst as full mineralisation of the dye liberates CO2.
2046-2069
30372-30379
Cui, Yongfei
fc74be3d-64f3-45db-9768-5f10be3fe0b0
Goldup, Stephen M.
0a93eedd-98bb-42c1-a963-e2815665e937
Dunn, Steve
d7e55c45-a1e1-4150-9f15-b7c7246fd419
Cui, Yongfei
fc74be3d-64f3-45db-9768-5f10be3fe0b0
Goldup, Stephen M.
0a93eedd-98bb-42c1-a963-e2815665e937
Dunn, Steve
d7e55c45-a1e1-4150-9f15-b7c7246fd419

Cui, Yongfei, Goldup, Stephen M. and Dunn, Steve (2015) Photodegradation of Rhodamine B over Ag modified ferroelectric BaTiO3under simulated solar light: pathways and mechanism. RSC Advances, 5 (38), 30372-30379. (doi:10.1039/c5ra00798d). (In Press)

Record type: Article

Abstract

The use of semiconductors with a ‘built in’ bias has now become of interest for a growing number of photoactive applications. Using a combination of spectroscopic techniques, gas chromatography in association with mass spectroscopy and NMR, we show that a sample of ferroelectric BaTiO3 decorated with nanostructured Ag denatures a standard dye molecule (Rhodamine B) via a photocatalytic oxidation mechanism. The photosensitized oxidation was inhibited due to band bending induced by ferroelectric polarisation. In the Ag–BaTiO3 system we find a slight hypsochromic wavelength shift during the initial stages of degradation (only 3 nm before 80% degradation percentage) and associate this shift with the cleavage of the chromophore structure which pre-empted deethylation. This shift in maximum absorption of the dye molecule did not occur until the later stages of molecule fragmentation. Our major identifiable breakdown intermediate was benzoic acid. A lack of other identifiable fragments during the breakdown of the dye is associated with retention of these fragments on the catalyst as full mineralisation of the dye liberates CO2.

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Accepted/In Press date: 24 March 2015
Organisations: Organic Chemistry: SCF

Identifiers

Local EPrints ID: 376043
URI: http://eprints.soton.ac.uk/id/eprint/376043
ISSN: 2046-2069
PURE UUID: 80715a17-e363-4952-a6f0-5a1be6eb1ffd
ORCID for Stephen M. Goldup: ORCID iD orcid.org/0000-0003-3781-0464

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Date deposited: 24 Apr 2015 13:32
Last modified: 14 Mar 2024 19:37

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Contributors

Author: Yongfei Cui
Author: Steve Dunn

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