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Nanocrystalline todorokite-like manganese oxide produced by bacterial catalysis
Hack-Sung Kim1, Pablo A Pastén, Jean-François Gaillard
1Institute for Environmental Catalysis (IEC), Center for Catalysis and Surface Science (CCSS), Department of Chemistry, Northwestern University, Evanston, IL 60208, USA.
Abstract:
We describe the characterization of an unknown and difficult to identify but geochemically and environmentally significant MnOx structure produced by a freshwater bacterium, Leptothrix discophora SP-6, using combined transmission electron microscopy (TEM), extended X-ray absorption fine structure (EXAFS), and UV Raman spectroscopy. The large surface-to-volume ratio of the needle-shaped nanocrystalline MnO2 formed around the bacterial cells coupled to the porous, zeolite-like structure has the potential to catalyze reactions and oxidize and adsorb metals.
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