Ultrasonic degradation of trichloroethylene and chlorobenzene at micromolar concentrations: kinetics and modelling

Ultrasonics Sonochemistry
J DewulfS Sabbe

Abstract

Although most papers in the field of sonochemical degradation of volatile organics in aqueous media describe experiments at the millimolar concentration range, this study focuses on the degradation kinetics of chlorobenzene (CB) and trichloroethylene (TCE) in the micromolar range. It was found that the reaction kinetics increase with decreasing initial substrate concentrations. For example, the pseudo-first-order reaction rate constant of CB increases by a factor of 14.3, if the initial concentration drops from 3440 to 1 microM. Previous work in the millimolar range has shown that the degradation of these volatiles is mainly due to pyrolytic reactions. The enhancement of the reaction kinetics at lower concentrations, in this work, could no longer be explained by this mechanism, even by taking into account the effect of the concentration of the solutes on the reaction temperature. Therefore, a new model was developed, incorporating gas phase OH radical induced degradation, next to pyrolysis. The model, fitting the experimental results, illustrated that at micromolar concentrations the OH radical induced degradation becomes significant. Simulations showed that at initial concentrations of CB > 1000 microM degradation is due to py...Continue Reading

References

Sep 1, 1992·Free Radical Biology & Medicine·P Riesz, T Kondo
Mar 1, 1989·Scientific American·A McPherson
Apr 19, 2000·Ultrasonics Sonochemistry·D DrijversV Herrygers
Mar 10, 2001·Ultrasonics Sonochemistry·D DrijversL Bray
Mar 29, 2001·Ultrasonics Sonochemistry·D DrijversK Vervaet

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Citations

Aug 28, 2013·Journal of Hazardous Materials·Guangji HuGuangming Zeng
Oct 31, 2002·Ultrasonics Sonochemistry·Carmen StavaracheY Maeda
Feb 24, 2004·Environmental Technology·R J EmeryD Mantzavinos
Aug 24, 2013·Ultrasonics Sonochemistry·Manisha V Bagal, Parag R Gogate
Dec 7, 2018·Multivariate Behavioral Research·Jieru Chen, Audrey J Leroux
Aug 16, 2011·Journal of Molecular Biology·Masatomo SoYuji Goto
Jul 13, 2006·The Journal of Physical Chemistry. a·Zhilin Wu, Bernd Ondruschka

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