Photodegradation of Rhodamine B over unexcited semiconductor compounds of BiOCl and BiOBr.

Xiaofeng Chang, M A Gondal, A A Al-Saadi, M A Ali, Hefei Shen, Qin Zhou, Jun Zhang, Mengping Du, Yousong Liu, Guangbin Ji, Xiaofeng Chang, M A Gondal, A A Al-Saadi, M A Ali, Hefei Shen, Qin Zhou, Jun Zhang, Mengping Du, Yousong Liu, Guangbin Ji

Index: J. Colloid. Interface Sci. , (2012)

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Abstract

This study reported, for the first time systematically, photodegradation of Rhodamine B (RhB) in aqueous solution over BiOCl and BiOBr semiconductors. Under visible light irradiation (λ>400 nm, λ>420 nm and λ=550±15 nm), RhB adsorbed on the surface of BiOCl and BiOBr was photosensitized and decomposed effectively over unexcited BiOCl and BiOBr. The degradation of Methyl Orange (MO) and Methylene Blue (MB) over BiOCl and BiOBr was investigated as well, and the results were compared with RhB photodegradation. It was found that MB molecules having the lowest LUMO could not be degraded by this process. Utilizing the quantum chemical calculation (Gaussian 03 program), the relationship between frontier orbital energy of selected dye molecules and photodegradation rate was established for the first time in this study.Crown Copyright © 2012. Published by Elsevier Inc. All rights reserved.