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Kinetics and Mechanism of Pentachlorophenol Degradation by Sonication, Ozonation, and Sonolytic Ozonation

Weavers, Linda K. and Malmstadt, Noah and Hoffmann, Michael R. (2000) Kinetics and Mechanism of Pentachlorophenol Degradation by Sonication, Ozonation, and Sonolytic Ozonation. Environmental Science and Technology, 34 (7). pp. 1280-1285. ISSN 0013-936X. https://resolver.caltech.edu/CaltechAUTHORS:20150812-143042805

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Abstract

The decomposition of pentachlorophenol (PCP) by sonication was investigated at two frequencies (20 and 500 kHz) and two concentrations (20 and 60 μM) to gain insight into the kinetics and mechanisms occurring at different frequencies. Results suggest the presence of parallel pyrolysis and OH• reaction pathways that are altered both as a function of frequency and PCP concentration. In addition, ozone was added to the system and compared to experiments of sonication and ozonation separately to explore the mechanism of sonolytic ozonation. The addition of ozone during sonication did not affect the first-order degradation constant for PCP compared to the linear combination of separate sonication and ozonation experiments; hence, the residual kinetic effect of the combined system was zero (k_(US/O_3) = 0). Observed byproducts of sonication include the following:  tetrachloro-o-benzoquinone (o-chloranil), tetrachlorocatechol (TCC), oxalate, and chloride.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/es980795yDOIArticle
http://pubs.acs.org/doi/abs/10.1021/es980795yPublisherArticle
ORCID:
AuthorORCID
Hoffmann, Michael R.0000-0001-6495-1946
Additional Information:© 2000 American Chemical Society. Received for review August 4, 1998. Revised manuscript received April 23, 1999. Accepted December 16, 1999. Publication Date (Web): February 16, 2000. The authors wish to thank Anne Johansen and Peter Green for help with analysis of intermediates. Financial support provided by Defense Advanced Research Projects Agency (DARPA), Office of Naval Research (ONR), the Electrical Power Research Institute (EPRI), and the Department of Energy (DOE) is gratefully acknowledged.
Funders:
Funding AgencyGrant Number
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
Office of Naval Research (ONR)UNSPECIFIED
Electric Power Research Institute (EPRI)UNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Issue or Number:7
Record Number:CaltechAUTHORS:20150812-143042805
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150812-143042805
Official Citation:Kinetics and Mechanism of Pentachlorophenol Degradation by Sonication, Ozonation, and Sonolytic Ozonation Linda K. Weavers, Noah Malmstadt, and Michael R. Hoffmann Environmental Science & Technology 2000 34 (7), 1280-1285 DOI: 10.1021/es980795y
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59453
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:13 Aug 2015 19:08
Last Modified:03 Mar 2020 13:01

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