Manganese mineral formation by bacterial spores of the marine Bacillus, strain SG-1: Evidence for the direct oxidation of Mn(II) to Mn(IV)

Mandernack, Kevin W.; Post, Jeffrey E.; Tebo, Bradley M.

doi:10.1016/0016-7037(95)00298-e

Cited by 188 publications

(113 citation statements)

References 40 publications

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“…In general, the stability of Mn(III)-bearing phases such as MnOOH and Mn 3 O 4 increases relative to that of Mn(IV)-bearing phases such as MnO 2 as pH and Mn(II) concentration increase, as dictated by the MnOOH/MnO 2 transformation reaction (Mandernack et al, 1995):…”

Section: Stability Of Pinal Creek Biogenic Mn Oxides: Constraints On mentioning

confidence: 99%

Structural characterization of terrestrial microbial Mn oxides from Pinal Creek, AZ

Bargar

Fuller

Marcus

et al. 2009

Geochimica et Cosmochimica Acta

110

106

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The microbial catalysis of Mn(II) oxidation is believed to be a dominant source of abundant sorption-and redox-active Mn oxides in marine, freshwater, and subsurface aquatic environments. In spite of their importance, environmental oxides of known biogenic origin have generally not been characterized in detail from a structural perspective. Hyporheic zone Mn oxide grain coatings at Pinal Creek, Arizona, a metals-contaminated stream, have been identified as being dominantly microbial in origin and are well studied from bulk chemistry and contaminant hydrology perspectives. This site thus presents an excellent opportunity to study the structures of terrestrial microbial Mn oxides in detail. XRD and EXAFS measurements performed in this study indicate that the hydrated Pinal Creek Mn oxide grain coatings are layer-type Mn oxides with dominantly hexagonal or pseudo-hexagonal layer symmetry. XRD and TEM measurements suggest the oxides to be nanoparticulate plates with average dimensions on the order of 11 nm thick Â 35 nm diameter, but with individual particles exhibiting thickness as small as a single layer and sheets as wide as 500 nm. The hydrated oxides exhibit a 10-Å basal-plane spacing and turbostratic disorder. EXAFS analyses suggest the oxides contain layer Mn(IV) site vacancy defects, and layer Mn(III) is inferred to be present, as deduced from Jahn-Teller distortion of the local structure. The physical geometry and structural details of the coatings suggest formation within microbial biofilms. The biogenic Mn oxides are stable with respect to transformation into thermodynamically more stable phases over a time scale of at least 5 months. The nanoparticulate layered structural motif, also observed in pure culture laboratory studies, appears to be characteristic of biogenic Mn oxides and may explain the common occurrence of this mineral habit in soils and sediments.

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Section: Stability Of Pinal Creek Biogenic Mn Oxides: Constraints On mentioning

confidence: 99%

Structural characterization of terrestrial microbial Mn oxides from Pinal Creek, AZ

Bargar

Fuller

Marcus

et al. 2009

Geochimica et Cosmochimica Acta

110

106

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“…DRIFT spectra were collected with a minimum of 400 scans at 4 cm −1 resolution (Figure 1b). DRIFT spectra were also collected on washed GB-1/MnO x samples generated from cells grown in the presence of MnSO 4 and harvested at 24 h. The washing procedure, which is a modification of more aggressive methods that employ organic solvents and/or oxidants (Mandernack et al 1995;Villalobos et al 2003), was intended to reduce biomass concentration without altering the MnO x structure. In this case, the use of oxidants and solvents was avoided.…”

Section: Diffuse Reflectance Infrared Fourier Transform (Drift)mentioning

confidence: 99%

“…These surface macromolecules may serve to template the oxide nucleation process and influence subsequent crystal growth in a manner that has been observed, for example, with Fe oxyhydroxides (Nesterova et al 2003;Chan et al 2004). When MnO x encrustations are formed on the surface of planktonic cells, they are expected to alter the cell surface charge and hydrophobicity, thus altering adhesion and transport properties of the cells (Rosenberg and Kjellberg 1986;van Loosdrecht et al 1987;van der Mei et al 1989). The solids may also be formed by intact biofilms that are already attached to stable substrata.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Mandernack et al (1995) reported mixed phase minerals (hausmmannite, Mn 3 O 4 ; feiknechtite, β-MnOOH; manganite, γ -MnOOH, and Na-buserite) following Mn(II) oxidation by a marine Bacillus strain SG-1, whereas a nanocrystalline todorokite-like mineral was produced by Leptothrix discophora strain SP-6 (Kim et al 2003). The MnO x formed by P. putida strain MnB1 was found to be most similar to "acid" birnessite (Villalobos et al 2003), whereas Mn oxide crusts from Pinal Creek, AZ comprise a mixture of todorokite and birnessite or takanelite/ranciete, possibly deriving from a buserite precursor (Bilinski et al 2002;Gilbert 2003).…”

Section: Introductionmentioning

confidence: 99%

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FTIR Spectroscopic Study of Biogenic Mn-Oxide Formation byPseudomonas putidaGB-1

Parikh

Chorover

2005

Geomicrobiology Journal

124

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“…[59] In nature, such light sensitive manganese oxide materials are produced by bacteria, and then dissolve on irradiation forming Mn 2+ and oxygen. [60][61][62] …”

Section: A Case Study: Combining Xas and Tem To Understand The Fate Omentioning

confidence: 99%

Preparation and Characterization of Catalysts for Clean Energy: A Challenge for X-rays and Electrons

Hocking¹,

Chang²,

MacFarlane³

et al. 2012

Aust. J. Chem.

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One of the most promising approaches to addressing the challenges of securing cheap and renewable energy sources is to design catalysts from earth abundant materials capable of promoting key chemical reactions including splitting water into hydrogen and oxygen (2H 2 O -2H 2 þ O 2 ) as well as both the oxidation (H 2 -2H þ ) and reduction (2H þ -H 2 ) of hydrogen. Key to elucidating the origin of catalytic activity and improving catalyst design is determining molecular-level structure, in both the 'resting state' and in the functioning 'active state' of the catalysts. Herein, we explore some of the analytical challenges important for designing and studying new catalytic materials for making and using hydrogen. We discuss a case study that used the combined approach of X-ray absorption spectroscopy and transmission electron microscopy to understand the fate of the molecular cluster, [Mn 4 O 4 L 6 ] þ , in Nafion.

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Manganese mineral formation by bacterial spores of the marine Bacillus, strain SG-1: Evidence for the direct oxidation of Mn(II) to Mn(IV)

Cited by 188 publications

References 40 publications

Structural characterization of terrestrial microbial Mn oxides from Pinal Creek, AZ

Structural characterization of terrestrial microbial Mn oxides from Pinal Creek, AZ

FTIR Spectroscopic Study of Biogenic Mn-Oxide Formation byPseudomonas putidaGB-1

Preparation and Characterization of Catalysts for Clean Energy: A Challenge for X-rays and Electrons

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