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Kinetics and Mechanism of the Sonolytic Destruction of Methyltert-Butyl Ether by Ultrasonic Irradiation in the Presence of Ozone

Kang, Joon-Wun and Hoffmann, Michael R. (1998) Kinetics and Mechanism of the Sonolytic Destruction of Methyltert-Butyl Ether by Ultrasonic Irradiation in the Presence of Ozone. Environmental Science and Technology, 32 (20). pp. 3194-3199. ISSN 0013-936X. http://resolver.caltech.edu/CaltechAUTHORS:20150807-112624294

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Abstract

The kinetics and mechanism of the sonolytic degradation of methyl tert-butyl ether (MTBE) have been investigated at an ultrasonic frequency of 205 kHz and power of 200 W L^(-1). The observed first-order degradation rate constant for the loss of MTBE increased from 4.1 × 10^(-4) s^(-1) to 8.5 × 10^(-4) s^(-1) as the concentration of MTBE decreased from 1.0 to 0.01 mM. In the presence of O_3, the sonolytic rate of destruction of MTBE was accelerated substantially. The rate of MTBE sonolysis with ozone was enhanced by a factor of 1.5−3.9 depending on the initial concentration of MTBE. tert-Butyl formate, tert-butyl alcohol, methyl acetate, and acetone were found to be the primary intermediates and byproducts of the degradation reaction with yields of 8, 5, 3, and 12%, respectively. A reaction mechanism involving three parallel pathways that include the direct pyrolytic decomposition of MTBE, the direct reaction of MTBE with ozone, and the reaction of MTBE with hydroxyl radical is proposed.


Item Type:Article
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http://dx.doi.org/10.1021/es970874uDOIArticle
http://pubs.acs.org/doi/abs/10.1021/es970874uPublisherArticle
ORCID:
AuthorORCID
Hoffmann, Michael R.0000-0002-0432-6564
Additional Information:© 1998 American Chemical Society. Received for review October 3, 1997. Revised manuscript received July 1, 1998. Accepted July 21, 1998. Publication Date (Web): September 4, 1998. Support for this research has been provided by the Department of Energy (DOE Grant 1-963472402) via Argonne National Laboratory.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DOE 1-963472402
Record Number:CaltechAUTHORS:20150807-112624294
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150807-112624294
Official Citation:Kinetics and Mechanism of the Sonolytic Destruction of Methyl tert-Butyl Ether by Ultrasonic Irradiation in the Presence of Ozone Joon-Wun Kang and Michael R. Hoffmann Environmental Science & Technology 1998 32 (20), 3194-3199 DOI: 10.1021/es970874u
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59317
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:07 Aug 2015 20:43
Last Modified:07 Aug 2015 20:43

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