Influence of magnetite stoichiometry on Fe(II) uptake and nitroaromatic reduction

Christopher Aaron Gorski, Michelle M. Scherer

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Magnetite (Fe3O4) is an iron oxide that contains both Fe(II) and Fe(III). It is a common constituent of soils, an important industrial ore, and a product of iron-respiring bacteria. Magnetite has an inverse spinel structure, which provides unique electronic and magnetic properties. Maghemite (γ-Fe2O3) is an oxidation product of magnetite, and contains only Fe(III). Maghemite is isostructural with magnetite, which makes distinguishing between the two phases challenging. Magnetite has been shown to reduce several environmental contaminants, including some chlorinated solvents and heavy metals. Nitroaromatic compounds, such as nitrobenzene and RDX, however, appear to be stable in the presence of magnetite unless aqueous Fe(II) is added. Here we revisit the reduction of nitrobenzene by magnetite synthesized with varying Fe(II) to Fe(III) stoichiometries. We also use the isotopic specificity of 57Fe Mössbauer spectroscopy to investigate the electron transfer reaction between aqueous Fe(II) and magnetite. We hypothesize that the redox behavior of magnetite with regards to Fe(II) sorption and contaminant reduction is strongly influenced by particle stoichiometry and diffusion through an oxidized coating.

Original languageEnglish (US)
Title of host publicationAmerican Chemical Society - 236th National Meeting and Exposition, Abstracts of Scientific Papers
StatePublished - Dec 1 2008
Event236th National Meeting and Exposition of the American Chemical Society, ACS 2008 - Philadelpia, PA, United States
Duration: Aug 17 2008Aug 21 2008

Publication series

NameACS National Meeting Book of Abstracts
ISSN (Print)0065-7727

Other

Other236th National Meeting and Exposition of the American Chemical Society, ACS 2008
CountryUnited States
CityPhiladelpia, PA
Period8/17/088/21/08

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Gorski, C. A., & Scherer, M. M. (2008). Influence of magnetite stoichiometry on Fe(II) uptake and nitroaromatic reduction. In American Chemical Society - 236th National Meeting and Exposition, Abstracts of Scientific Papers (ACS National Meeting Book of Abstracts).