NDLI: Morphology, structure, and metal binding mechanisms of biogenic manganese oxides in a superfund site treatment system

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Morphology, structure, and metal binding mechanisms of biogenic manganese oxides in a superfund site treatment system

Content Provider	Royal Society of Chemistry (RSC)
Author	Santelli, C. M. Andrews, M. Y. Duckworth, O. W. Rivera, N. A. Gardner, T. G. Polizzotto, M. L.
Copyright Year	2017
Abstract	Manganese oxides, which may be biogenically produced in both pristine and contaminated environments, have a large affinity for many trace metals. In this study, water and Mn oxide-bearing biofilm samples were collected from the components of a pump and treat remediation system at a superfund site. To better understand the factors leading to their formation and their effects on potentially toxic metal fate, we conducted a chemical, microscopic, and spectroscopic characterization of these biofilm samples. Scanning electron microscopy revealed the presence of Mn oxides in close association with biological structures with morphologies consistent with fungi. X-ray absorption spectroscopy (XAS) and X-ray diffraction (XRD) revealed the oxides to be a mixture of layer and tunnel structure Mn(IV) oxides. In addition, XAS suggested that Ba, Co, and Zn all primarily bind to oxides in the biofilm in a manner that is analogous to synthetic or laboratory grown bacteriogenic Mn oxides. The results indicate that Mn oxides produced by organisms in the system may effectively scavenge metals, thus highlighting the potential utility of these organisms in designed remediation systems.
Starting Page	50
Ending Page	58
Page Count	9
File Format	HTM / HTML PDF
ISSN	20507887
Volume Number	19
Issue Number	1
Journal	Environmental Science: Processes & Impacts
DOI	10.1039/c6em00525j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	XAS Ba Manganese Biofilm Scanning electron microscope Fungus X-ray absorption spectroscopy Absorption spectroscopy X-ray crystallography
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law

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