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Structural study of a series of synthetic goethites obtained in aqueous solutions containing cadmium(II) ions

Published online by Cambridge University Press:  05 March 2012

E. E. Sileo ,
P. S. Solı´s  and
C. O. Paiva-Santos
E. E. Sileo*
Affiliation:
INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. II, Piso 3, C1428EHA, Buenos Aires, Argentina
P. S. Solı´s
Affiliation:
INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. II, Piso 3, C1428EHA, Buenos Aires, Argentina
C. O. Paiva-Santos
Affiliation:
Instituto de Quı´mica, Universidade Estadual Paulista, UNESP, Araraquara, 14801-970 Sa˜o Paulo, Brazil
*
a)Electronic mail: [email protected]
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Abstract

The capacity of goethite for CdII substitution has been explored in a series of synthetic samples prepared from FeIII and CdII nitrate solutions aged 21 days in alkaline media. The total metal content ([Fe]+[Cd]) was 0.071 M in all preparations. The samples have been characterized by chemical and X-ray diffraction analysis; the morphology of the solids is described. The cell parameters for all samples were obtained by the Rietveld fits to the X-ray diffraction data. Refined structures show that for samples prepared at the final molar ratio μCd≤5.50 (expressed as μCd=100×[Cd]/[Cd]+[Fe]), a (Cd, Fe)-goethite is the only crystalline product. In these samples, the unit cell parameters increased as a function of Cd concentration, indicating Cd incorporation in the structural frame. At the preparative ratio, μCd=7.03, the incorporation of Cd in the goethite structure is drastically reduced and a probable Cd-substituted hematite is formed together with the Fe,Cd-goethite.

Keywords

X-ray powder diffractionRietveld analysissubstituted goethitecadmiumsubstituted hematite
Type
New Diffraction Data
Information
Powder Diffraction , Volume 18 , Issue 1 , March 2003 , pp. 50 - 55
Copyright
Copyright © Cambridge University Press 2003

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