Oxidative and Reductive Pathways in Manganese-Catalyzed Fenton’s Reactions
Publication: Journal of Environmental Engineering
Volume 131, Issue 1
Abstract
Soluble manganese (II) and amorphous and crystalline manganese (IV) oxides were investigated as catalysts for the Fenton-like decomposition of hydrogen peroxide into oxidants and reductants. 1-Hexanol was used as a hydroxyl radical probe and carbon tetrachloride (CT) was used as a reductant probe. Soluble manganese (II)-catalyzed reactions at acidic pH resulted in degradation of 1-hexanol and no measurable transformation of CT, indicating that hydroxyl radicals were generated but reductants were not. However, when these reactions were conducted at near-neutral pH, an amorphous manganese oxide precipitate formed and 89% of the CT degraded in , while 1-hexanol degradation was negligible. Using an amorphous manganese oxide synthesized in a separate reactor, CT was rapidly degraded while 1-hexanol oxidation was undetectable. Reactions catalyzed by the crystalline manganese oxide pyrolusite at near-neutral pH also resulted in significant CT degradation, indicating that reductants are generated by both the crystalline and amorphous manganese oxide-catalyzed decomposition of . The presence of manganese oxides in the subsurface and their ability to catalyze the generation of reductants in modified Fenton’s reactions has important implications for hydrogen peroxide stability and contaminant transformation pathways during the in situ Fenton’s treatment of contaminated soils and groundwater.
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Acknowledgment
Funding for this research was provide by the National Science Foundation through Grant No. BES 00-1364.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 131 • Issue 1 • January 2005
Pages: 158 - 164
Copyright
© 2004 ASCE.
History
Received: Jan 3, 2003
Accepted: Dec 18, 2003
Published online: Jan 1, 2005
Published in print: Jan 2005
Notes
Note. Associate Editor: Mark J. Rood
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