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Title: Kinetics and mechanism of the enhanced reductive degradation of nitrobenzene by elemental iron in the presence of ultrasound

Abstract

Sonolysis, reduction by elemental iron (Fe{sup 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{sup 0} are enhanced in the presence of ultrasound. The first-order rate constant, K{sub US}, for nitrobenzene degradation by ultrasound is 1.8 x 10{sup {minus}3} min{sup {minus}1}, while in the presence of Fe{sup 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{sup 0}. The observed rate enhancements for the degradation of nitrobenzene can be attributed primarily to the continuous cleaning and chemical activation of the Fe{sup 0} surfaces by acoustic cavitation and to accelerated mass transport rates of reactants, intermediates, and products between the solution phase and the Fe{sup 0} surface. The relative concentrations of nitrosobenzene and aniline, the principal reaction intermediates generated by Fe{sup 0} reduction, are altered substantially in the presence of ultrasound.

Authors:
; ;
Publication Date:
Research Org.:
California Inst. of Tech., Pasadena, CA (US)
Sponsoring Org.:
US Department of the Navy, Office of Naval Research (ONR); USDOE
OSTI Identifier:
20080517
Resource Type:
Journal Article
Journal Name:
Environmental Science and Technology
Additional Journal Information:
Journal Volume: 34; Journal Issue: 9; Other Information: PBD: 1 May 2000; Journal ID: ISSN 0013-936X
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; REMEDIAL ACTION; NITROBENZENE; IRON; ANILINE; WATER POLLUTION CONTROL; ULTRASONOGRAPHY

Citation Formats

Hung, H.M., Ling, F.H., and Hoffmann, M.R. Kinetics and mechanism of the enhanced reductive degradation of nitrobenzene by elemental iron in the presence of ultrasound. United States: N. p., 2000. Web. doi:10.1021/es990385p.
Hung, H.M., Ling, F.H., & Hoffmann, M.R. Kinetics and mechanism of the enhanced reductive degradation of nitrobenzene by elemental iron in the presence of ultrasound. United States. doi:10.1021/es990385p.
Hung, H.M., Ling, F.H., and Hoffmann, M.R. Mon . "Kinetics and mechanism of the enhanced reductive degradation of nitrobenzene by elemental iron in the presence of ultrasound". United States. doi:10.1021/es990385p.
@article{osti_20080517,
title = {Kinetics and mechanism of the enhanced reductive degradation of nitrobenzene by elemental iron in the presence of ultrasound},
author = {Hung, H.M. and Ling, F.H. and Hoffmann, M.R.},
abstractNote = {Sonolysis, reduction by elemental iron (Fe{sup 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{sup 0} are enhanced in the presence of ultrasound. The first-order rate constant, K{sub US}, for nitrobenzene degradation by ultrasound is 1.8 x 10{sup {minus}3} min{sup {minus}1}, while in the presence of Fe{sup 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{sup 0}. The observed rate enhancements for the degradation of nitrobenzene can be attributed primarily to the continuous cleaning and chemical activation of the Fe{sup 0} surfaces by acoustic cavitation and to accelerated mass transport rates of reactants, intermediates, and products between the solution phase and the Fe{sup 0} surface. The relative concentrations of nitrosobenzene and aniline, the principal reaction intermediates generated by Fe{sup 0} reduction, are altered substantially in the presence of ultrasound.},
doi = {10.1021/es990385p},
journal = {Environmental Science and Technology},
issn = {0013-936X},
number = 9,
volume = 34,
place = {United States},
year = {2000},
month = {5}
}