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Tetrachloroethylene and hexachloroethane degradation in Fe(III) and Fe(III)-citrate catalyzed Fenton systems.

Authors :
Jho, EunHea
Singhal, Naresh
Turner, Susan
Source :
Journal of Chemical Technology & Biotechnology; Aug2012, Vol. 87 Issue 8, p1179-1186, 8p
Publication Year :
2012

Abstract

BACKGROUND: Tetrachloroethylene (PCE) and hexachloroethane (HCA) degradation, individually and in mixture, is investigated by Fe(III) or Fe(III)-citrate initiated Fenton reaction under a range of hydrogen peroxide (H<subscript>2</subscript>O<subscript>2</subscript>) concentrations to illustrate the applicability and constraints of Fenton chemistry in degrading contaminants in polluted groundwater. RESULTS: In individual solutions Fe(III) rapidly degraded PCE for all H<subscript>2</subscript>O<subscript>2</subscript> concentrations, but HCA at ≥ 0.2 mol L<superscript>−1</superscript> H<subscript>2</subscript>O<subscript>2</subscript>; the apparent PCE degradation rate initially increased but then decreased with increasing H<subscript>2</subscript>O<subscript>2</subscript>, while the HCA degradation rate was either unaffected or increased. With Fe(III)-citrate PCE degradation was lower and no HCA degradation occurred. PCE degradation was lower in PCE-HCA mixture, but the trend with H<subscript>2</subscript>O<subscript>2</subscript> concentration was similar to the individual chemical; for HCA the residual was smaller for higher H<subscript>2</subscript>O<subscript>2</subscript> concentration, but the apparent degradation rate constant was unaffected. CONCLUSION: Fe(III) catalyzed reactions can potentially degrade chemicals through reductive as well as oxidative transformations. Degradation of chemicals in mixtures occurs at a slower rate due to competition for radical moieties. The Fe(III)-citrate complex further slowed chemical transformation. This study expands on the use of different forms of iron to catalyze the Fenton reaction to degrade chemicals. Copyright © 2012 Society of Chemical Industry [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
02682575
Volume :
87
Issue :
8
Database :
Complementary Index
Journal :
Journal of Chemical Technology & Biotechnology
Publication Type :
Academic Journal
Accession number :
77826135
Full Text :
https://doi.org/10.1002/jctb.3746