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Effect of controlled periodic-based illumination on the photonic efficiency of photocatalytic degradation of methyl orange.

Tokode, Oluwatosin I.; Prabhu, Radhakrishna; Lawton, Linda A.; Robertson, Peter K.J.

Authors

Oluwatosin I. Tokode

Peter K.J. Robertson



Abstract

The use of controlled periodic illumination with UV LEDs for enhancing photonic efficiency of photocatalytic decomposition processes in water has been investigated using methyl orange as a model compound. The impact of the length of light and dark time periods (TON/TOFF times) on photodegradation and photonic efficiency using a UV LED-illuminated photoreactor has been studied. The results have shown an inverse dependency of the photonic efficiency on duty cycle and a very little effect on TON or TOFF time periods, indicating no effect of rate-limiting steps through mass diffusion or adsorption/desorption in the reaction. For this reactor, the photonic efficiency under controlled periodic illumination (CPI) matches to that of continuous illumination, for the same average UV light intensities. Furthermore, under CPI conditions, the photonic efficiency is inversely related to the average UV light intensity in the reactor, in the millisecond time regime. This is the first study that has investigated the effect of controlled periodic illumination using ultra band gap UV LED light sources in the photocatalytic destruction of dye compounds using titanium dioxide. The results not only enhance the understanding of the effect of periodic illumination on photocatalytic processes but also provide a greater insight to the potential of these light sources in photocatalytic reactions.

Citation

TOKODE, O.I., PRABHU, R., LAWTON, L.A. and ROBERTSON, P.K.J. 2012. Effect of controlled periodic-based illumination on the photonic efficiency of photocatalytic degradation of methyl orange. Journal of catalysis [online], 290, pages 138-142. Available from: https://doi.org/10.1016/j.jcat.2012.03.011

Journal Article Type Article
Acceptance Date Mar 12, 2012
Online Publication Date Apr 21, 2012
Publication Date Jun 30, 2012
Deposit Date Feb 19, 2021
Publicly Available Date Mar 30, 2021
Journal Journal of Catalysis
Print ISSN 0021-9517
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 290
Pages 138-142
DOI https://doi.org/10.1016/j.jcat.2012.03.011
Keywords Photocatalysis; Photonic efficiency; Titanium dioxide; UV-LED; Photoreactor; Controlled periodic illumination
Public URL https://rgu-repository.worktribe.com/output/1148002

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