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Lee, Changha
Advanced Redox Technology (ART) Lab
Research Interests
  • Water Treatment, Advanced Oxidation/Reduction, Water Chemistry, Environmental Catalyst

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Application of photoactivated periodate to the decolorization of reactive dye: reaction parameters and mechanism

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Title
Application of photoactivated periodate to the decolorization of reactive dye: reaction parameters and mechanism
Author
Lee, ChanghaYoon, J
Keywords
Advanced oxidation; Periodate; Reactive dye; Ultraviolet irradiation
Issue Date
2004-07
Publisher
ELSEVIER SCIENCE SA
Citation
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, v.165, no.1-3, pp.35 - 41
Abstract
The decolorization of the reactive dye, reactive black 5 (RB5), by the photoactivated periodate (UV/IO4 -) was investigated under ultraviolet (UV) irradiation at 254 nm, and its possible mechanism based on periodate photochemistry was discussed, in order to elucidate the main oxidants involved in the decolorization of RB5 as the reaction parameters, such as the light intensity, periodate concentration, dissolved oxygen, and solution pH, were varied, with the intermittent employment of an •OH scavenger. The decolorization rate of RB5 increased linearly with increasing light intensity. The decolorization rate was found to increase at low periodate concentrations (0-5 mM), but slightly decrease at higher concentrations (>5 mM). Dissolved oxygen did not have any measurable effect on the decolorization rate of the reactive dye. No pH dependence of the decolorization rate was observed over the pH range of 1.5-10, regardless of the periodate speciation. Based on these results, the main oxidants responsible for the RB5 decolorization with UV 254 were found to be •OH and IO3 • (IVI•), after considering the six intermediate species which are reported to be produced as a result of periodate photolysis, namely the radical species (•OH, IO3 •, and IO4 •;) and the non-radical species (O3, IO4 -, and IO3 -).
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DOI
10.1016/j.jphotochem.2004.02.018
ISSN
1010-6030
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UEE_Journal Papers
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