Reduction of ferric green rust by Shewanella putrefaciens

• Published in: Letters in applied microbiology Vol. 45; no. 5; pp. 515 - 521
• Main Authors: Jorand, F, Zegeye, A, Landry, F, Ruby, C
• Format: Journal Article
• Language: English
• Published: Oxford, UK Oxford, UK : Blackwell Publishing Ltd 01-11-2007; Blackwell Publishing Ltd; Blackwell Science; Oxford University Press
• Subjects: Biological and medical sciences; biomineralization; Environmental Sciences; Ferric Compounds - metabolism; Fundamental and applied biological sciences. Psychology; green rust; iron reduction; Marine; Microbiology; Minerals - metabolism; Oxidation-Reduction; Shewanella; Shewanella putrefaciens; Shewanella putrefaciens - metabolism; Reduction; iron réduction; Applied microbiology; Mineralization; Biomineralization; Bacteria; Vibrionaceae; Shewanella putrefaciens; Iron; Shewanella; green rust; biomineralization, green rust, iron reduction, shewanella
• ISSN: 0266-8254; 1472-765X
• DOI: 10.1111/j.1472-765X.2007.02225.x

To reduce carbonated ferric green rust (GR*) using an iron respiring bacterium and obtain its reduced homologue, the mixed FeII-FeIII carbonated green rust (GR). The GR* was chemically synthesized by oxidation of the GR and was incubated with Shewanella putrefaciens cells at a defined [FeIII]/[cell] ratio. Sodium methanoate served as the sole electron donor. The GR* was quickly transformed in GR (iron reducing rate = 8·7 mmol l⁻¹ h⁻¹). Ferric green rust is available for S. putrefaciens respiration as an electron acceptor. The reversibility of the GR redox state can be driven by bacterial activity. This work suggests that GRs would act as an electronic balance in presence of bacteria. It provides also new perspectives for using iron reducing bacterial activity to regenerate the reactive form of GR during soil or water decontamination processes.