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Size dependent microbial oxidation and reduction of magnetite nano- and micro-particles

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep30969· OSTI ID:1601832
 [1];  [2];  [2];  [3];  [3];  [3];  [4];  [4];  [3];  [1]
  1. Univ. of Tuebingen (Germany)
  2. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Diamond Light Source, Ltd.
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  4. Minnesota State Univ., Mankato, MN (United States)
The ability for magnetite to act as a recyclable electron donor and acceptor for Fe- metabolizing bacteria has recently been shown. However, it remains poorly understood whether microbe-mineral interfacial electron transfer processes are limited by the redox capacity of the magnetite surface or that of whole particles. Here we examine this issue for the phototrophic Fe(II)-oxidizing bacteria Rhodopseudomonas palustris TIE-1 and the Fe(III)-reducing bacteria Geobacter sulfurreducens, comparing magnetite nanoparticles (d ≈ 12 nm) against microparticles (d ≈ 100-200 nm). By integrating surface-sensitive and bulk-sensitive measurement techniques we observed a particle surface that was enriched in Fe(II) with respect to a more oxidized core. This enables microbial Fe(II) oxidation to occur relatively easily at the surface of the mineral suggesting that the electron transfer is dependent upon particle size. However, microbial Fe(III) reduction proceeds via conduction of electrons into the particle interior, i.e. it can be considered as more of a bulk electron transfer process that is independent of particle size. The finding has potential implications on the ability of magnetite to be used for long range electron transport in soils and sediments.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1601832
Report Number(s):
PNNL-SA--119852
Journal Information:
Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 6; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Oxidation induced strain and defects in magnetite crystals journal February 2019
Phases and rates of iron and magnetism changes during paddy soil development on calcareous marine sediment and acid Quaternary red-clay journal January 2018
Microbial anaerobic Fe(II) oxidation - Ecology, mechanisms and environmental implications: Microbial anaerobic Fe(II) oxidation journal October 2018
Redox cycling of Fe(II) and Fe(III) in magnetite accelerates aceticlastic methanogenesis by Methanosarcina mazei journal October 2019

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