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The Nature of Co in Synthetic Co-substituted Goethites

Published online by Cambridge University Press:  01 January 2024

Raúl Pozas ,
T. Cristina Rojas ,
Manuel Ocaña  and
Carlos J. Serna
Raúl Pozas
Affiliation:
Instituto de Ciencia de Materiales de Sevilla, CSIC-Universidad de Sevilla, C. Américo Vespucio s/n, 41092 Sevilla, Spain
T. Cristina Rojas
Affiliation:
Instituto de Ciencia de Materiales de Sevilla, CSIC-Universidad de Sevilla, C. Américo Vespucio s/n, 41092 Sevilla, Spain
Manuel Ocaña*
Affiliation:
Instituto de Ciencia de Materiales de Sevilla, CSIC-Universidad de Sevilla, C. Américo Vespucio s/n, 41092 Sevilla, Spain
Carlos J. Serna
Affiliation:
Instituto de Ciencia de Materiales de Madrid, CSIC, Campus Universitario de Cantoblanco, 28049 Madrid, Spain
*
*E-mail address of corresponding author: mjurado@icmse.csic.es
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Abstract

The crystallochemical features of Co in Co-substituted goethite solid-solutions prepared by two different procedures have been studied using infrared, X-ray photoelectron and electron energy loss spectroscopies. It was found that the path followed for the synthesis of Co-substituted goethite determines the oxidation state of Co in the goethite structure. Thus, in the solid-solution prepared by precipitation with Na2CO3 of an Fe(II) aqueous solution containing Co(II) cations, followed by the aerial oxidation of the precipitate, the Co cations were found to be divalent, whereas trivalent Co was incorporated into the goethite obtained by ageing a solution containing Fe(III) and Co(II) cations precipitated by the addition of KOH. This different behavior is explained by the higher pH of goethite formation in the latter case, which favors the oxidation of the Co(II) cations.

Keywords

CobaltEELSGoethiteIRSolid-solutionXPS
Type
Research Article
Information
Clays and Clay Minerals , Volume 52 , Issue 6 , December 2004 , pp. 760 - 766
Copyright
Copyright © 2004, The Clay Minerals Society

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