Mathematical modelling of quantum yield enhancements of methyl orange photooxidation in aqueous TiO2 suspensions under controlled periodic UV LED illumination.

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

Abstract

Quantum yields of the photocatalytic degradation of methyl orange under controlled periodic illumination (CPI) have been modelled using existing models. A modified Langmuir-Hinshelwood (L-H) rate equation was used to predict the degradation reaction rates of methyl orange at various duty cycles and a simple photocatalytic model was applied in modelling quantum yield enhancement of the photocatalytic process due to the CPI effect. A good agreement between the modelled and experimental data was observed for quantum yield modelling. The modified L-H model, however, did not accurately predict the photocatalytic decomposition of the dye under periodic illumination.

Citation

TOKODE, O., PRABHU, R., LAWTON, L.A. and ROBERTSON, P.K.J. 2014. Mathematical modelling of quantum yield enhancements of methyl orange photooxidation in aqueous TiO2 suspensions under controlled periodic UV LED illumination. Applied catalysis B: environmental [online], 156-157, pages 398-403. Available from: https://doi.org/10.1016/j.apcatb.2014.03.046

• Journal Article Type: Article
• Acceptance Date: Mar 22, 2014
• Online Publication Date: Mar 30, 2014
• Publication Date: Sep 1, 2014
• Deposit Date: Sep 16, 2016
• Publicly Available Date: Sep 16, 2016
• Journal: Applied catalysis B: environmental
• Print ISSN: 0926-3373
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 156-157
• Pages: 398-403
• DOI: https://doi.org/10.1016/j.apcatb.2014.03.046
• Keywords: Photocatalysis; Titanium dioxide; Quantum yield; Langmuir Hinshelwood; Mathematical model
• Public URL: http://hdl.handle.net/10059/1725