Verification of competitive kinetics technique and oxidation kinetics of 2,6-dimethyl-aniline and o-toluidine by Fenton process
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Publication Details
Author list: Anotai J., Panchanawaporn N., Boonrattanakij N., Lu M.-C.
Publisher: Elsevier
Publication year: 2011
Journal: Journal of Hazardous Materials (0304-3894)
Volume number: 188
Issue number: #
Start page: 269
End page: 273
Number of pages: 5
ISSN: 0304-3894
eISSN: 1873-3336
Languages: English-Great Britain (EN-GB)
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Abstract
The competitive kinetics technique is shown to be a useful and reliable tool for determining rate constants. Regardless of the conditions of the reaction and the operation mode, the intrinsic second-order rate constants of 2,6-dimethyl-aniline and hydroxyl radicals were 1.65ื1010, 1.60ื1010, and 1.71ื1010M-1s-1 in the absence of SiO2 under complete-mix conditions, in the presence of SiO2 under complete-mix conditions, and in a fluidized-bed Fenton reactor with SiO2 as the media, respectively, demonstrating that the rates are comparable under a variety of reaction conditions. The average intrinsic second-order rate constant of o-toluidine and hydroxyl radicals obtained in a homogeneous system under various conditions was 7.36ื109M-1s-1, indicating that o-toluidine is less susceptible to hydroxyl radicals than 2,6-dimethyl-anilne. Hydroxyl radicals primarily attacked the amine group rather than the methyl group of the o-toluidine to form o-cresol and 2-nitrotoluene, which sequentially transformed to carboxylic acids including acetic, oxalic, lactic, and maleic acids after the collapse of the benzene ring. ฉ 2011 Elsevier B.V.
Keywords
Advanced oxidation processes, Fluidized-bed Fenton, Hydroxyl radicals
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