Roles of Reactive Oxygen Species and Holes in the Photodegradation of Cationic and Anionic Dyes by under UV Irradiation
Publication: Journal of Environmental Engineering
Volume 142, Issue 2
Abstract
This study compared the roles of different reactive oxygen species (ROS) in the photodegradation of cationic dye methylene blue (MB) and anionic dye orange II (OII) by the (UV) system using different radical quenchers to elucidate the oxidation mechanisms for cationic and anionic dyes. In this study, the holes and surficial rather than in the bulk solution were found to play the dominant role in the photodegradation of the two types of dyes, accounting for 60% of the total degradation (the remaining 40% degradation could be contributed by , , and the UV photolysis). Interestingly, potassium iodide (KI) as the scavenger for surficial radicals could inhibit the OII degradation but enhanced the MB degradation, probably due to the formation of oxidized products such as or that could react with MB. played a more contributing role in the photodegradation of OII than MB, whereas exhibited the same contribution to the photodegradation of OII and MB. The results suggested that the photocatalytic reaction mechanisms for cationic and anionic dyes may vary with the types of ROS generated in the system.
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Acknowledgments
We thank the support from NSF of China (21377039). This study was partially supported by the Research Startup Fund at NJIT.
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Published In
Journal of Environmental Engineering
Volume 142 • Issue 2 • February 2016
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© 2015 American Society of Civil Engineers.
History
Received: Aug 26, 2014
Accepted: Aug 6, 2015
Published online: Sep 30, 2015
Published in print: Feb 1, 2016
Discussion open until: Feb 29, 2016
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