Formation of Zerovalent Iron in Iron-Reducing Cultures of Methanosarcina barkeri

Haitao Shang, Mirna Daye, Orit Sivan, Caue S. Borlina, Nobumichi Tamura, Benjamin P. Weiss, Tanja Bosak

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)7354-7365
Number of pages12
JournalEnvironmental Science & Technology
Volume54
Issue number12
DOIs
StatePublished - 16 Jun 2020

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