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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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High temperature dependence of 2,4-dichlorophenoxyacetic acid degradation by Fe(3+)/H(2)O(2) system

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Title
High temperature dependence of 2,4-dichlorophenoxyacetic acid degradation by Fe(3+)/H(2)O(2) system
Author
Lee, YLee, ChanghaYoon, J
Keywords
• OH; 2,4-D; Advanced oxidation process; Fenton reaction; H2O2; Reaction temperature
Issue Date
2003-06
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
CHEMOSPHERE, v.51, no.9, pp.963 - 971
Abstract
This study demonstrates the importance of reaction temperature on the degradation of 2,4-dichlorophenoxyacetic acid (2,4-D). In addition, we provide a mechanistic explanation for the temperature dependence of 2,4-D degradation. Thermal enhancement of 2,4-D degradation and H2O2 decomposition was measured in the absence and in the presence of the .OH scavenger (t-butanol). The half-life for 2,4-D degradation was reduced by more than 70-fold in the absence of t-butanol, and by more than 700-fold, in the presence of t-butanol, when the reaction temperature was increased from 10 to 50 °C. In addition, similar temperature relationships were found for H2O2 decomposition. The major reason for the high temperature dependence of the Fe3+/H2O2 system in the case of 2,4-D degradation is due to the dependence of the initiation reaction of the Fe3+/H2O2 system (i.e., Fe3+ + H2O2 → Fe2+ + HO. 2 + H+ upon temperature), which is entirely consistent with the kinetics of the activation energy. In the presence of a .OH scavenger, the initiation reaction of the Fe3+/H2O2 system became a determining factor of this temperature dependence, whereas in the absence of .OH scavenger, several other radical reactions played a role and this result in an apparent decrease in the activation energy for 2,4-D degradation. Moreover, the enhanced 2,4-D removal at higher temperatures did not alter H2O2 utilization. The practical implications of the thermal enhancement of the Fe3+/H2O2 system are discussed.
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DOI
10.1016/S0045-6535(03)00043-2
ISSN
0045-6535
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UEE_Journal Papers
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