Journal article
Influence of the oxidizing species on the reactivity of iron-based Bimetallic reductants
Environmental science & technology, Vol.41(10), pp.3734-3740
05/15/2007
DOI: 10.1021/es062993s
PMID: 17547205
Abstract
Anticipating which pollutants are amenable to treatment by iron-based bimetallic reductants requires an understanding of the mechanism(s) driving pollutant reduction. Here, batch studies with six bimetals (Au/Fe, Co/Fe, Cu/Fe, Ni/ Fe, Pd/Fe, and Pt/Fe) and four oxidants (alkyl polyhalides, vinyl polyhalides, alkynes, and water) explored the influence of the electron acceptor on reductant reactivity. Bimetals exhibited disparate reactivity toward some oxidant classes. For example, Pt/Fe enhanced rates of cis-dichloroethylene reduction, but it inhibited the reduction of several alkyl polyhalides. Moreover, the rate increase for vinyl polyhalide reduction by Ni/Fe (approximately 100-fold) and Pd/Fe (approximately 1000-fold) was far greater than that measured for alkyl polyhalides (approximately 10-fold), and reactivity toward vinyl polyhalides exhibited a more pronounced dependence on Ni and Pd loadings than did reactivity toward alkyl polyhalides. These results suggest that the reactions of alkyl and vinyl polyhalides with iron-based bimetals involve different active reductants. Neither rates of alkyl nor vinyl polyhalide reduction correlated with rates of iron corrosion by water, contrary to expectations if galvanic corrosion was primarily responsible for organohalide reduction. Trends observed for the hydrogenation of 2-butyne did mirror the sequence we identified for 1,1,1-trichloroethane reduction, consistent with a role for atomic hydrogen as the principal electron donor in these two systems.
Details
- Title: Subtitle
- Influence of the oxidizing species on the reactivity of iron-based Bimetallic reductants
- Creators
- David M Cwiertny - Department of Geography and Environmental Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, USAStephen J BransfieldA Lynn Roberts
- Resource Type
- Journal article
- Publication Details
- Environmental science & technology, Vol.41(10), pp.3734-3740
- Publisher
- United States
- DOI
- 10.1021/es062993s
- PMID
- 17547205
- ISSN
- 0013-936X
- eISSN
- 1520-5851
- Language
- English
- Date published
- 05/15/2007
- Academic Unit
- Center for Health Effects of Environmental Contamination; Civil and Environmental Engineering; Public Policy Center (Archive); Chemical and Biochemical Engineering
- Record Identifier
- 9983991934202771
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