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Demonstration of visible light activated photocatalytic self-cleaning by thin films of perovskite tantalum and niobium oxynitrides

Demonstration of visible light activated photocatalytic self-cleaning by thin films of perovskite tantalum and niobium oxynitrides
Demonstration of visible light activated photocatalytic self-cleaning by thin films of perovskite tantalum and niobium oxynitrides
Metal oxynitrides adopting the perovskite structure have been shown to be visible light activated photocatalysts. In this work, we establish a route for the deposition of thin films for seven perovskite oxynitrides, CaTaO2N, SrTaO2N, BaTaO2N, LaTaON2, EuTaO2N, SrNbO2N and LaNbON2, on quartz and alumina substrates using dip-coating of a poly-mer gel to form an amorphous oxide precursor film, followed by ammonolysis. The initially deposited oxide films were annealed at 800 °C, followed by ammonolysis at temperatures from 850 °C to 1000 °C. The perovskite oxynitride thin films were characterized using XRD and EDX, with band gaps determined using Tauc plots derived from UV-vis spec-troscopic data. A cobalt oxide co-catalyst was deposited onto each film by drop casting and the photocatalytic activity assessed under visible light using dichloroindophenol dye degradation in the presence of a sacrificial oxidant. The light source used was a solar simulator equipped with a 400 nm cut-off filter. The dye degradation test demonstrated photo-catalytic activity in all samples except EuTaO2N and BaTaO2N. The three most active samples were SrNbO2N, CaTaO2N and SrTaO2N. The cobalt oxide loading was optimized for these three films and found to be 0.3 g cm-2. Further catalyt-ic tests were conducted using stearic acid degradation, and this found the film of SrNbO2N with cobalt oxide co-catalyst to be the most active for complete mineralization of this model pollutant.
1944-8244
Iborra Torres, Antonio
231fb0fc-78fd-40ea-9ebd-0bb0c6131e71
Kulak, Alexander N.
b5932a7d-a10a-4862-ac32-a7a1e08be88b
Palgrave, Robert G.
6b26b39c-1da4-4937-beaa-c0848840b7bd
Hyett, Geoffrey
4f292fc9-2198-4b18-99b9-3c74e7dfed8d
Iborra Torres, Antonio
231fb0fc-78fd-40ea-9ebd-0bb0c6131e71
Kulak, Alexander N.
b5932a7d-a10a-4862-ac32-a7a1e08be88b
Palgrave, Robert G.
6b26b39c-1da4-4937-beaa-c0848840b7bd
Hyett, Geoffrey
4f292fc9-2198-4b18-99b9-3c74e7dfed8d

Iborra Torres, Antonio, Kulak, Alexander N., Palgrave, Robert G. and Hyett, Geoffrey (2020) Demonstration of visible light activated photocatalytic self-cleaning by thin films of perovskite tantalum and niobium oxynitrides. ACS Applied Materials & Interfaces. (doi:10.1021/acsami.0c05008).

Record type: Article

Abstract

Metal oxynitrides adopting the perovskite structure have been shown to be visible light activated photocatalysts. In this work, we establish a route for the deposition of thin films for seven perovskite oxynitrides, CaTaO2N, SrTaO2N, BaTaO2N, LaTaON2, EuTaO2N, SrNbO2N and LaNbON2, on quartz and alumina substrates using dip-coating of a poly-mer gel to form an amorphous oxide precursor film, followed by ammonolysis. The initially deposited oxide films were annealed at 800 °C, followed by ammonolysis at temperatures from 850 °C to 1000 °C. The perovskite oxynitride thin films were characterized using XRD and EDX, with band gaps determined using Tauc plots derived from UV-vis spec-troscopic data. A cobalt oxide co-catalyst was deposited onto each film by drop casting and the photocatalytic activity assessed under visible light using dichloroindophenol dye degradation in the presence of a sacrificial oxidant. The light source used was a solar simulator equipped with a 400 nm cut-off filter. The dye degradation test demonstrated photo-catalytic activity in all samples except EuTaO2N and BaTaO2N. The three most active samples were SrNbO2N, CaTaO2N and SrTaO2N. The cobalt oxide loading was optimized for these three films and found to be 0.3 g cm-2. Further catalyt-ic tests were conducted using stearic acid degradation, and this found the film of SrNbO2N with cobalt oxide co-catalyst to be the most active for complete mineralization of this model pollutant.

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Perovskite Oxynitride Hyett AMandI V3 - Accepted Manuscript
Restricted to Repository staff only until 30 June 2021.
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Accepted/In Press date: 30 June 2020
e-pub ahead of print date: 30 June 2020

Identifiers

Local EPrints ID: 442285
URI: http://eprints.soton.ac.uk/id/eprint/442285
ISSN: 1944-8244
PURE UUID: 9e66f7e2-45b4-43c6-a158-f7f4e9391946
ORCID for Geoffrey Hyett: ORCID iD orcid.org/0000-0001-9302-9723

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Date deposited: 10 Jul 2020 16:31
Last modified: 07 Oct 2020 02:02

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