| Selective redox degradation of chlorinated aliphatic compounds by Fenton reaction in pyrite suspension. | |
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MedLine Citation:
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PMID: 21186044 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Selective redox degradation of chlorinated aliphatics by Fenton reaction in pyrite suspension was investigated in a closed system. Carbon tetrachloride (CT) was used as a representative target of perchlorinated alkanes and trichloroethylene (TCE) was used as one of highly chlorinated alkenes. Degradation of CT in Fenton reaction was significantly enhanced by pyrite used as an iron source instead of soluble Fe. Pyrite Fenton showed 93% of CT removal in 140min, while Fenton reaction with soluble Fe(II) showed 52% and that with Fe(III) 15%. Addition of 2-propanol to the pyrite Fenton system significantly inhibited degradation of TCE (99% to 44% of TCE removal), while degradation of CT was slightly improved by the 2-propanol addition (80-91% of CT removal). The result suggests that, unlike oxidative degradation of TCE by hydroxyl radical in pyrite Fenton system, an oxidation by the hydroxyl radical is not a main degradation mechanism for the degradation of CT in pyrite Fenton system but a reductive dechlorination by superoxide can rather be the one for the CT degradation. The degradation kinetics of CT in the pyrite Fenton system was decelerated (0.13-0.03min(-1)), as initial suspension pH decreased from 3 to 2. The formation of superoxide during the CT degradation in the pyrite Fenton system was observed by electron spin resonance spectroscopy. The formation at initial pH 3 was greater than that at initial pH 2, which supported that superoxide was a main reductant for degradation of CT in the pyrite Fenton system. |
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Authors:
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Hyeongsu Che; Woojin Lee |
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Publication Detail:
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Type: Journal Article Date: 2010-12-24 |
Journal Detail:
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Title: Chemosphere Volume: 82 ISSN: 1879-1298 ISO Abbreviation: Chemosphere Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-01-26 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0320657 Medline TA: Chemosphere Country: England |
Other Details:
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Languages: eng Pagination: 1103-8 Citation Subset: IM |
Copyright Information:
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Copyright © 2010 Elsevier Ltd. All rights reserved. |
Affiliation:
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Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-Dong, Yuseong-Gu, Daejeon 305-701, Republic of Korea. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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