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Tunable Biogenic Manganese Oxides
Author(s) -
Simonov Alexandr N.,
Hocking Rosalie K.,
Tao Lizhi,
Gengenbach Thomas,
Williams Timothy,
Fang XiYa,
King Hannah J.,
Bonke Shan A.,
Hoogeveen Dijon A.,
Romano Christine A.,
Tebo Bradley M.,
Martin Lisandra L.,
Casey William H.,
Spiccia Leone
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201702579
Subject(s) - birnessite , manganese , x ray photoelectron spectroscopy , transmission electron microscopy , substrate (aquarium) , materials science , chemical engineering , scanning electron microscope , reactivity (psychology) , morphology (biology) , crystallography , chemistry , nanotechnology , manganese oxide , metallurgy , geology , composite material , medicine , paleontology , oceanography , alternative medicine , pathology , engineering
Influence of the conditions for aerobic oxidation of Mn 2 +( aq )catalysed by the MnxEFG protein complex on the morphology, structure and reactivity of the resulting biogenic manganese oxides (MnO x ) is explored. Physical characterisation of MnO x includes scanning and transmission electron microscopy, and X‐ray photoelectron and K‐edge Mn, Fe X‐ray absorption spectroscopy. This characterisation reveals that the MnO x materials share the structural features of birnessite, yet differ in the degree of structural disorder. Importantly, these biogenic products exhibit strikingly different morphologies that can be easily controlled. Changing the substrate‐to‐protein ratio produces MnO x either as nm‐thin sheets, or rods with diameters below 20 nm, or a combination of the two. Mineralisation in solutions that contain Fe 2 +( aq )makes solids with significant disorder in the structure, while the presence of Ca 2 +( aq )facilitates formation of more ordered materials. The (photo)oxidation and (photo)electrocatalytic capacity of the MnO x minerals is examined and correlated with their structural properties.