A Closer Look at Fe(II) Passivation of Goethite

Luiza Notini; Drew E Latta; Anke Neumann; Carolyn I Pearce; Michel Sassi; Alpha T N’Diaye; Kevin M Rosso; Michelle M Scherer

doi:10.1021/acsearthspacechem.9b00224

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A Closer Look at Fe(II) Passivation of Goethite

Journal article

Peer reviewed

A Closer Look at Fe(II) Passivation of Goethite

Luiza Notini, Drew E Latta, Anke Neumann, Carolyn I Pearce, Michel Sassi, Alpha T N’Diaye, Kevin M Rosso and Michelle M Scherer

ACS earth and space chemistry, Vol.3(12), pp.2717-2725

12/19/2019

DOI: 10.1021/acsearthspacechem.9b00224

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https://www.osti.gov/biblio/1637301View

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Abstract

Our understanding of how Fe(II) reacts with Fe(III) oxides has evolved based on evidence for electron transfer at the oxide–water interface and Fe(II)-catalyzed recrystallization. There is, however, some evidence that these, and other processes, such as microbial reduction, cease after continued contact with Fe(II) as the Fe oxide becomes “passivated”. Here, we explore the mechanism of oxide passivation by measuring whether exposure to Fe(II) inhibits Fe(II)–goethite electron transfer, and whether this inhibition is reversible. To quantify the extent of electron transfer, we used selective isotope labeling with 57Fe Mössbauer spectroscopy. We provide experimental evidence that pre-exposure to Fe(II) alters the products formed and inhibits the extent of electron transfer between goethite and Fe(II). We demonstrate that the goethite surface can accumulate a passivation layer of sorbed Fe(II) and that further electron transfer between Fe(II) and goethite is inhibited. Importantly, however, electron transfer can be partially restored upon removal of the layer of Fe(II) by extraction or oxidation. Our results suggest that in environments that are commonly subjected to transient geochemical fluctuations, electron transfer between Fe(II) and Fe oxides, and processes linked to it are likely to be relevant beyond just short time scales.

Details

Title: Subtitle: A Closer Look at Fe(II) Passivation of Goethite
Creators: Luiza Notini - University of Iowa
Drew E Latta - University of Iowa
Anke Neumann - Newcastle University
Carolyn I Pearce - Pacific Northwest National Laboratory
Michel Sassi - Pacific Northwest National Laboratory
Alpha T N’Diaye - Lawrence Berkeley National Laboratory
Kevin M Rosso - Pacific Northwest National Laboratory
Michelle M Scherer - University of Iowa
Resource Type: Journal article
Publication Details: ACS earth and space chemistry, Vol.3(12), pp.2717-2725
DOI: 10.1021/acsearthspacechem.9b00224
ISSN: 2472-3452
eISSN: 2472-3452
Grant note: DOI: 10.13039/100000165, name: Division of Chemistry, award: 1708467; DOI: 10.13039/100006151, name: Basic Energy Sciences; DOI: 10.13039/100000082, name: Division of Graduate Education, award: 1633098; DOI: 10.13039/100000015, name: U.S. Department of Energy, award: DE-AC05-76RL01830
Language: English
Date published: 12/19/2019
Academic Unit: Civil and Environmental Engineering; IIHR--Hydroscience and Engineering
Record Identifier: 9984197282802771

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