CaltechAUTHORS
  A Caltech Library Service

Kinetics and Mechanism of the Enhanced Reductive Degradation of Nitrobenzene by Elemental Iron in the Presence of Ultrasound

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

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20150807-092337220

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/es990385pDOIArticle
http://pubs.acs.org/doi/abs/10.1021/es990385pPublisherArticle
ORCID:
AuthorORCID
Hung, Hui-Ming0000-0002-6755-6359
Hoffmann, Michael R.0000-0001-6495-1946
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.
Funders:
Funding AgencyGrant Number
Office of Naval Research (ONR)NAV5- N0001492J1901
Office of Naval Research (ONR)NAV1-N47408-97-M-0771
Department of Energy (DOE)DOE 1 963472402
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

Repository Staff Only: item control page