Verification of competitive kinetics technique and oxidation kinetics of 2,6-dimethyl-aniline and o-toluidine by Fenton process

doi:10.1016/j.jhazmat.2011.01.098

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Title:	Verification of competitive kinetics technique and oxidation kinetics of 2,6-dimethyl-aniline and o-toluidine by Fenton process
Authors:	Anotai, Jin Panchanawaporn, Nacorn Boonrattanakij, Nonglak Lu, Ming-Chun
Contributors:	環境資源管理系
Keywords:	Advanced oxidation processes Fluidized-bed Fenton Hydroxyl radicals Mechanism
Date:	2011-04
Issue Date:	2013-10-16 16:57:36 (UTC+8)
Publisher:	Elsevier
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 1.65 × 1010, 1.60 × 1010, and 1.71 × 1010 M−1 s−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 7.36 × 109 M−1 s−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.
Relation:	Journal of Hazardous Materials, 188(1-3), pp.269-273
Appears in Collections:	[Dept. of Environmental Resources Management] Periodical Articles

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