Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
580784 | Journal of Hazardous Materials | 2009 | 6 Pages |
Abstract
This research investigated the intrinsic second-order rate constant between 2,6-dimethyl-aniline (2,6-DMA) and hydroxyl radicals (OH) using Fenton's reactions under both batch and continuous operations. The competitive kinetics technique with aniline as a reference compound was employed. In the batch study under various conditions, the second-order rate constants of 2,6-DMA with OH were between 1.59Â ÃÂ 1010 and 1.80Â ÃÂ 1010Â Mâ1Â sâ1 with a mean of 1.71Â ÃÂ 1010Â Mâ1Â sâ1 which equals the average value obtained from the continuous study as well. The concentrations of OH at the steady state under the continuous mode were estimated to be between 4.85Â ÃÂ 10â10 and 6.82Â ÃÂ 10â10Â mM. 2,6-dimethyl-nitrobenzene, 2,6-dimethyl-phenol, 2,6-dimethyl-nitrophenol, 2,6-dimethyl-hydroquinone, 2,6-dimethyl-p-benzoquinone, and 2,6-dimethyl-3-hydroxy-p-benzoquinone were identified as the aromatic by-products indicating that the methyl group on the aromatic ring was not susceptible to OH attack. Maleic, lactic, oxalic, acetic, and formic acids were found as generated carboxylic acids. An oxidation pathway of 2,6-DMA by OH is also proposed.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Health and Safety
Authors
Nonglak Boonrattanakij, Ming-Chun Lu, Jin Anotai,