Structural influences of sodium and calcium ions on the biogenic manganese oxides produced by the marine Bacillus sp., strain SG-1

Sam M. Webb, B. M. Tebo, J. R. Bargar

Research output: Contribution to journalArticle

42 Scopus citations

Abstract

Natural manganese oxide nanoparticles and grain coatings profoundly impact contaminant cycling in the environment through their ability to degrade organic compounds and sequester metal ions. Previous studies of biogenic manganese oxides have shown that the interlayer cation may have an important effect on the resulting oxide structure. The effect of Na and Ca ions was investigated to determine their fundamental roles in the stabilization of the phyllomanganate biooxide structure, its unit cell symmetry, and order/disorder relations. Biogenic oxides were created by incubating Mn(II) with spores of the marine Bacillus sp., strain SG-1 and the resulting oxide structures examined using X-ray absorption spectroscopy and X-ray diffraction to determine the short-range and long-range atomic structure. Phyllomanganates were observed exclusively, with differing degrees of layer stacking disorder, degree of crystallinity, and layer symmetry, depending on the cation present. In general, Ca was found to promote biooxide long-range order. We conclude that the presence of Ca in these oxides will confer greater stability to these bacteriogenic manganese bioxodes.

Original languageEnglish (US)
Pages (from-to)181-193
Number of pages13
JournalGeomicrobiology Journal
Volume22
Issue number3-4
DOIs
StatePublished - Apr 1 2005

Keywords

  • Biomineralization
  • Mn oxidation
  • XAS
  • XRD

ASJC Scopus subject areas

  • Microbiology
  • Environmental Chemistry
  • Environmental Science(all)
  • Earth and Planetary Sciences (miscellaneous)

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