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Oxidative Degradation of 2,4,6-Trinitrotoluene by Ozone in an Electrohydraulic Discharge Reactor

Lang, P. S. and Ching, W-K. and Willberg, D. M. and Hoffmann, M. R. (1998) Oxidative Degradation of 2,4,6-Trinitrotoluene by Ozone in an Electrohydraulic Discharge Reactor. Environmental Science and Technology, 32 (20). pp. 3142-3148. ISSN 0013-936X. https://resolver.caltech.edu/CaltechAUTHORS:20150807-112624545

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Abstract

The electrohydraulic discharge process in the presence of ozone has been used to investigate the rapid degradation and mineralization of aqueous 2,4,6-trinitrotoluene (TNT) solutions that were directly exposed to high-energy electrical discharges between two submerged electrodes. The 165 μM solutions of TNT were completely (>90%) mineralized over the course of 300 electrical discharges of 7 kJ each. The kinetics of TNT degradation were investigated as a function of the aqueous-phase ozone concentration, pH, discharge energy, and electrode gap length. The rate of TNT degradation increases with an increase in aqueous-phase ozone concentration of up to 150 μM, an increase in pH from 3.0 to 7.9, an increase in discharge energy from 5.5 to 9 kJ, and a decrease in the electrode gap length from 10 to 6 mm. The rapid rates of mineralization (e.g. 12 ms) are attributed to the action of UV light in the reactor chamber on O_3 to produce a high flux of hydroxyl radicals per discharge (1 μM discharge^(-1)). The primary reaction intermediates were 2,4,6-trinitrobenzaldehyde and trinitrobenzene.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/es980052cDOIArticle
http://pubs.acs.org/doi/abs/10.1021/es980052cPublisherArticle
ORCID:
AuthorORCID
Hoffmann, M. R.0000-0001-6495-1946
Additional Information:© 1998 American Chemical Society. Received for review January 21, 1998. Revised manuscript received June 2, 1998. Accepted July 3, 1998. Publication Date (Web): August 29, 1998. Financial support from the Advanced Research Projects Agency (Grant NAV5HFMN N0001492J1901), the Office of Naval Research, and the Electric Power Institute (Grant RP 8003-37) is gratefully acknowledged.
Funders:
Funding AgencyGrant Number
Office of Naval Research (ONR)NAV5HFMN N0001492J1901
Electric Power Research Institute (EPRI)RP 8003-37
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
Issue or Number:20
Record Number:CaltechAUTHORS:20150807-112624545
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150807-112624545
Official Citation:Oxidative Degradation of 2,4,6-Trinitrotoluene by Ozone in an Electrohydraulic Discharge Reactor P. S. Lang, W-K. Ching, D. M. Willberg, and M. R. Hoffmann Environmental Science & Technology 1998 32 (20), 3142-3148 DOI: 10.1021/es980052c
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59318
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:07 Aug 2015 19:09
Last Modified:03 Mar 2020 13:01

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