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. doi:10.1021/es970874u. https://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.
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| 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. | |||||||||
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| Issue or Number: | 20 | |||||||||
| DOI: | 10.1021/es970874u | |||||||||
| Record Number: | CaltechAUTHORS:20150807-112624294 | |||||||||
| Persistent URL: | https://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: | 10 Nov 2021 22:18 |
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