Hung, Hui-Ming and Ling, Frank H. and Hoffmann, Michael R. (2000) Kinetics and Mechanism of the Enhanced Reductive Degradation of Nitrobenzene by Elemental Iron in the Presence of Ultrasound. Environmental Science and Technology, 34 (9). pp. 1758-1763. ISSN 0013-936X. https://resolver.caltech.edu/CaltechAUTHORS:20150807-092337220
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Abstract
Sonolysis, reduction by elemental iron (Fe^0), and a combination of the two processes were used to facilitate the degradation of nitrobenzene (NB) and aniline (AN) in water. The rates of reduction of nitrobenzene by Fe^0 are enhanced in the presence of ultrasound. The first-order rate constant, k_(US), for nitrobenzene degradation by ultrasound is 1.8 × 10^(-3) min^(-1), while in the presence of Fe^0, the rate was found to be substantially faster. The observation of similar degradation rates for aniline in each system suggests that the sonication process was not affected by the presence of Fe^0. The observed rate enhancements for the degradation of nitrobenzene can be attributed primarily to the continuous cleaning and chemical activation of the Fe^0 surfaces by acoustic cavitation and to accelerated mass transport rates of reactants, intermediates, and products between the solution phase and the Fe^0 surface. The relative concentrations of nitrosobenzene and aniline, the principal reaction intermediates generated by Fe^0 reduction, are altered substantially in the presence of ultrasound.
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| Additional Information: | © 2000 American Chemical Society. Received for review April 5, 1999. Revised manuscript received September 17, 1999. Accepted December 29, 1999. Publication Date (Web): March 23, 2000. Financial support from the Office of Naval Research (NAV5-N0001492J1901; NAV1-N47408-97-M-0771) and the Department of Energy (DOE 1 963472402) is gratefully acknowledged. | |||||||||
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| Issue or Number: | 9 | |||||||||
| Record Number: | CaltechAUTHORS:20150807-092337220 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20150807-092337220 | |||||||||
| Official Citation: | Kinetics and Mechanism of the Enhanced Reductive Degradation of Nitrobenzene by Elemental Iron in the Presence of Ultrasound Hui-Ming Hung, Frank H. Ling, and Michael R. Hoffmann Environmental Science & Technology 2000 34 (9), 1758-1763 DOI: 10.1021/es990385p | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 59310 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Ruth Sustaita | |||||||||
| Deposited On: | 07 Aug 2015 18:37 | |||||||||
| Last Modified: | 09 Mar 2020 13:18 |
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