Kinetics of halogenated organic compound degradation by iron metal

Timothy L. Johnson, Michelle M. Scherer, Paul Tratnyek

Research output: Contribution to journalArticle

613 Citations (Scopus)

Abstract

A combination of new and previously reported data on the kinetics of dehalogenation by zero-valent iron (Fe0) has been subjected to an analysis of factors effecting contaminant degradation rates. First-order rate constants (k(obs)) from both batch and column studies vary widely and without meaningful correlation. However, normalization of these data to iron surface area concentration yields a specific rate constant (k(SA)) that varies by only 1 order of magnitude for individual halocarbons. Correlation analysis using k(SA) reveals that dechlorination is generally more rapid at saturated carbon centers than unsaturated carbons and that high degrees of halogenation favor rapid reduction. However, new data and additional analysis will be necessary to obtain reliable quantitative structure-activity relationships. Further generalization of our kinetic model has been obtained by accounting for the concentration and saturation of reactive surface sites, but k(SA) is still the most appropriate starting point for design calculations. Representative values of k(SA) have been provided for the common chlorinated solvents.

Original languageEnglish (US)
Pages (from-to)2634-2640
Number of pages7
JournalEnvironmental Science and Technology
Volume30
Issue number8
DOIs
StatePublished - Aug 1996

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Organic compounds
organic compound
Rate constants
Carbon
Iron
Metals
Halocarbons
Halogenation
Dehalogenation
iron
Degradation
kinetics
Dechlorination
degradation
Kinetics
metal
halocarbon
carbon
dechlorination
Impurities

ASJC Scopus subject areas

  • Environmental Science(all)
  • Environmental Chemistry
  • Environmental Engineering

Cite this

Kinetics of halogenated organic compound degradation by iron metal. / Johnson, Timothy L.; Scherer, Michelle M.; Tratnyek, Paul.

In: Environmental Science and Technology, Vol. 30, No. 8, 08.1996, p. 2634-2640.

Research output: Contribution to journalArticle

Johnson, Timothy L. ; Scherer, Michelle M. ; Tratnyek, Paul. / Kinetics of halogenated organic compound degradation by iron metal. In: Environmental Science and Technology. 1996 ; Vol. 30, No. 8. pp. 2634-2640.
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