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Formation of hydroxysulphate and hydroxycarbonate green rusts in the presence of zinc using time-resolved in situ small and wide angle X-ray scattering

Published online by Cambridge University Press:  05 July 2018

I. A. M. Ahmed*
Affiliation:
School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK
S. Shaw
Affiliation:
School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK
L. G. Benning
Affiliation:
School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK

Abstract

The formation and transformation of hydroxysulphate (GRSO4) and hydroxycarbonate (GRCO3) Green Rusts were studied in situ using synchrotron-based time-resolved small and wide angle X-ray scattering. The time-resolved data revealed, for the first time, the pH dependent transition from poorly-ordered schwertmannite (pH <6.5) into GRSO4 (pH ~6.8) followed by GRCO3 (at pH ~9.6). These data also showed that the addition of Zn to the starting sulphate Fe2+/Fe3+ solution resulted in a change in size of the GR unit-cell due to substitution of Zn into the GR structure.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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