Tunable Biogenic Manganese Oxides

Alexandr N. Simonov, Rosalie K. Hocking, Lizhi Tao, Thomas Gengenbach, Timothy Williams, Xi Ya Fang, Hannah J. King, Shannon A. Bonke, Dijon A. Hoogeveen, Christine A. Romano, Bradley Tebo, Lisandra L. Martin, William H. Casey, Leone Spiccia

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Influence of the conditions for aerobic oxidation of Mn2+(aq) catalysed by the MnxEFG protein complex on the morphology, structure and reactivity of the resulting biogenic manganese oxides (MnOx) is explored. Physical characterisation of MnOx includes scanning and transmission electron microscopy, and X-ray photoelectron and K-edge Mn, Fe X-ray absorption spectroscopy. This characterisation reveals that the MnOx 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 MnOx either as nm-thin sheets, or rods with diameters below 20nm, or a combination of the two. Mineralisation in solutions that contain Fe2+(aq) makes solids with significant disorder in the structure, while the presence of Ca2+(aq) facilitates formation of more ordered materials. The (photo)oxidation and (photo)electrocatalytic capacity of the MnOx minerals is examined and correlated with their structural properties.

Original languageEnglish (US)
JournalChemistry - A European Journal
DOIs
StateAccepted/In press - 2017

Fingerprint

Manganese oxide
Oxide minerals
Proteins
X ray absorption spectroscopy
Photooxidation
Photoelectrons
Structural properties
manganese oxide
Transmission electron microscopy
X rays
Oxidation
Scanning electron microscopy
Substrates

Keywords

  • Biogenic materials
  • Manganese
  • MnxEFG protein complex
  • Structural disorder
  • Structure elucidation
  • Tunable morphology

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Simonov, A. N., Hocking, R. K., Tao, L., Gengenbach, T., Williams, T., Fang, X. Y., ... Spiccia, L. (Accepted/In press). Tunable Biogenic Manganese Oxides. Chemistry - A European Journal. https://doi.org/10.1002/chem.201702579

Tunable Biogenic Manganese Oxides. / Simonov, Alexandr N.; Hocking, Rosalie K.; Tao, Lizhi; Gengenbach, Thomas; Williams, Timothy; Fang, Xi Ya; King, Hannah J.; Bonke, Shannon A.; Hoogeveen, Dijon A.; Romano, Christine A.; Tebo, Bradley; Martin, Lisandra L.; Casey, William H.; Spiccia, Leone.

In: Chemistry - A European Journal, 2017.

Research output: Contribution to journalArticle

Simonov, AN, Hocking, RK, Tao, L, Gengenbach, T, Williams, T, Fang, XY, King, HJ, Bonke, SA, Hoogeveen, DA, Romano, CA, Tebo, B, Martin, LL, Casey, WH & Spiccia, L 2017, 'Tunable Biogenic Manganese Oxides', Chemistry - A European Journal. https://doi.org/10.1002/chem.201702579
Simonov AN, Hocking RK, Tao L, Gengenbach T, Williams T, Fang XY et al. Tunable Biogenic Manganese Oxides. Chemistry - A European Journal. 2017. https://doi.org/10.1002/chem.201702579
Simonov, Alexandr N. ; Hocking, Rosalie K. ; Tao, Lizhi ; Gengenbach, Thomas ; Williams, Timothy ; Fang, Xi Ya ; King, Hannah J. ; Bonke, Shannon A. ; Hoogeveen, Dijon A. ; Romano, Christine A. ; Tebo, Bradley ; Martin, Lisandra L. ; Casey, William H. ; Spiccia, Leone. / Tunable Biogenic Manganese Oxides. In: Chemistry - A European Journal. 2017.
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