Fenton oxidation of 2,4- and 2,6-dinitrotoluene and acetone inhibition
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The performances and kinetic parameters of Fenton oxidation of 2,4- and 2,6-dinitrotoluene (DNT) in water-acetone mixtures and explosive contaminated soil washing-out solutions were investigated at a laboratory scale. The experimental results show that acetone can be a significant hydroxyl radical scavenger and result in serious inhibition of Fenton oxidation of 2,4- and 2,6-DNT. Although no serious inhibition was found in contaminated soil washing-out solutions, longer reaction time was needed to remove 2,4- and 2,6-DNT completely, mainly due to the competition of hydroxyl radicals. Fenton oxidation of 2,4- and 2,6-DNT fit well with the first-order kinetics and the presence of acetone also reduced DNT’s degradation kinetics. Based on the comparison and matching of retention time and ultraviolet (UV) spectra between high performance liquid chromatography (HPLC) and standards, the following reaction pathway for 2,4-DNT primary degradation was proposed: 2,4-DNT → 2,4-dinitro-benzaldehyde → 2,4-dinitrobenzoic acid → 1,3-dinitrobenzene → 3-nitrophenol.
Keywordsdinitrotoluenes Fenton oxidation acetone inhibition degradation kinetic reaction pathway
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- 1.Spain J C, Hughes J B, Knackmuss H J. Biodegradation of Nitroaromatic Compounds and Explosives. Boca Raton, Florida, USA: Lewis Publishers, 2000, 1–6Google Scholar
- 2.Rickert D E. Toxicity of Nitroaromatic Compounds. Washington, DC, USA: Hemisphere Publishing Corp, 1985, 53Google Scholar
- 4.Venkatadri R, Peters R W. Chemical oxidation technologies: Ultraviolet light/hydrogen peroxide, Fenton’s reagent, and titanium dioxide-assisted photocatalysis. Hazard. Waste Hazard. Mater., 1993, 10(2): 107–149Google Scholar
- 5.Mohanty N R, Wei IW. Oxidation of 2,4-dinitrotoluene using Fenton’s reagent: Reaction mechanisms and their practical applications. Hazard. Waste Hazard. Mater., 1993, 10: 171–183Google Scholar
- 14.Goi A, Trapido M. Degradation of polycyclic aromatic hydrocarbons in soil: The Fenton reagent versus ozonation. Eviron. Technol., 2004, 25: 155–164Google Scholar
- 20.American Pubic Health Associateion (APHA), American Water Works Association, and Water Pollution Control Federation. Standard Methods for Examination of Water and Wastewater. 20th ed. Washington DC, USA: American Public Health Association, 1998Google Scholar
- 22.Buxton G V, Greenstock C L, Helman W P, Ross A B. Critical review of rate constants for reactions of hydrated electrons, hydrogen atoms, and hydroxyl radicals (·OH/·O−) in aqueous solution. Journal of Physical Chemistry Reference Data, 1988, 17: 513–886Google Scholar