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Copper substitution alone and in the presence of chromium, zinc, cadmium and lead in goethite (α-FeOOH)

Published online by Cambridge University Press:  09 July 2018

N. Kaur ,
B. Singh  and
B. J. Kennedy
N. Kaur
Affiliation:
Faculty of Agriculture, Food & Natural Resources, The University of Sydney, New South Wales 2006, Australia
B. Singh*
Affiliation:
Faculty of Agriculture, Food & Natural Resources, The University of Sydney, New South Wales 2006, Australia
B. J. Kennedy
Affiliation:
School of Chemistry, The University of Sydney, New South Wales 2006, Australia
*
*E-mail: [email protected]
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Abstract

A series of Cu-substituted goethites, single and co-substituted with Cr, Zn, Cd and/or Pb was prepared, having molar ratios equal to 2.00, 3.33 and 5.00 mol%. All the samples contained only goethite, except Cu-, (Cu,Zn)- and (Cu,Pb)-samples synthesized at 5.00 mol% where hematite was also formed. The presence of Cr/Cd suppressed the hematite-forming effects of Cu. The general sequence of metal entry into the single-metal-substituted goethites was Zn = Cr > Cd > Cu > Pb and in di- (5.00 mol%) and tri- (3.33 mol%) metal-substituted goethites was Cu > Zn > Cd > Cr >> Pb. Cu incorporation increased all the unit-cell parameters in single-metal-substituted goethite, and these parameters increased in combination with other metals as follows: Cd > Zn > Cr > Pb in the multimetal-substituted goethites. The Cu-substituted goethite dissolved faster than pure goethite. Co substitutions of Cr/Pb reduced the dissolution rate (kFe), while substitutions of Cd/Zn increased kFe.

Keywords

ion substitutiongoethitesynchrotron XRDRietveld refinementTEMdissolutiondehydroxylation temperature
Type
Research Article
Information
Clay Minerals , Volume 44 , Issue 3 , September 2009 , pp. 293 - 310
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2009

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