Formation of Zerovalent Iron in Iron-Reducing Cultures of Methanosarcina barkeri
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Accepted version
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Author(s)
Shang, Haitao
Daye, Mirna
Sivan, Orit
Sciascia Borlina, Caue
Tamura, Nobumichi
Weiss, Benjamin P.
Bosak, Tanja
Date Issued
2020
Journal
Environmental Science and Technology
Publisher
American Chemical Society (ACS)
Version
Author's final manuscript
Abstract
© 2020 American Chemical Society. Methanogenic archaea have been shown to reduce iron from ferric [Fe(III)] to ferrous [Fe(II)] state, but minerals that form during iron reduction by different methanogens remain to be characterized. Here, we show that zerovalent iron (ZVI) minerals, ferrite [α-Fe(0)] and austenite [γ-Fe(0)], appear in the X-ray diffraction spectra minutes after the addition of ferrihydrite to the cultures of a methanogenic archaeon, Methanosarcina barkeri (M. barkeri). M. barkeri cells and redox-active, nonenzymatic soluble organic compounds in organic-rich spent culture supernatants can promote the formation of ZVI; the latter compounds also likely stabilize ZVI. Methanogenic microbes that inhabit organic- and Fe(III)-rich anaerobic environments may similarly reduce Fe(III) to Fe(II) and ZVI, with implications for the preservation of paleomagnetic signals during sediment diagenesis and potential applications in the protection of iron metals against corrosion and in the green synthesis of ZVI.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1021/ACS.EST.0C01595
