Enhanced photocatalytic degradation of methylene blue under vacuum ultraviolet irradiation
Date
2013
Authors
Huang, H.
Leung, D.
Kwong, C.
Xiong, J.
Zhang, L.
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Journal article
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Catalysis Today, 2013; 201(1):189-194
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Haibao Huang, Dennis Y.C. Leung, Philip C.W. Kwong, Jing Xiong, Lu Zhang
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Abstract
A vacuum ultraviolet (VUV) lamp was used as the irradiation of photocatalysis to enhance the degradation of methylene blue (MB), a model dye compound. In contrast to photocatalysis under 254 nm UV irradiation (UV/TiO <inf>2</inf>), photocatalysis under VUV irradiation (VUV/TiO<inf>2</inf>) exhibited much higher efficiency in MB degradation and mineralization and needed less TiO<inf>2</inf> dosage. The rate constant of MB degradation in VUV/TiO<inf>2</inf> (0.0793 min<sup>-1</sup>) is about 4 times of that of UV/TiO<inf>2</inf> (0.0205 min<sup>-1</sup>). The MB mineralization rate is also greatly increased from 12.5% in UV/TiO<inf>2</inf> to 47.7% in VUV/TiO <inf>2</inf> after 60 min of irradiation. Multiple advanced oxidation processes including photocatalytic oxidation and VUV photo-oxidation coexist in VUV/TiO<inf>2</inf> to substantially produce highly reactive species (such as OH and energetic photons), which is responsible for efficient degradation and mineralization of MB. © 2012 Elsevier B.V.
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© 2012 Elsevier B.V. All rights reserved.