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Properties of synthetic goethites with Co for Fe substitution

Published online by Cambridge University Press:  09 July 2018

U. G. Gasser ,
E. Jeanroy ,
C. Mustin ,
O. Barres ,
R. Nüesch ,
J. Berthelin  and
A. J. Herbillon
U. G. Gasser
Affiliation:
Centre de Pédologie Biologique, U.P.R. 6831 du C.N.R.S. associée à l'Université Henri Poincaré, Nancy, 17, rue Notre-Dame des Pauvres, B.P. 5, F 54501 Vandœuvre-lès-Nancy, France
E. Jeanroy
Affiliation:
Centre de Pédologie Biologique, U.P.R. 6831 du C.N.R.S. associée à l'Université Henri Poincaré, Nancy, 17, rue Notre-Dame des Pauvres, B.P. 5, F 54501 Vandœuvre-lès-Nancy, France
C. Mustin
Affiliation:
Centre de Pédologie Biologique, U.P.R. 6831 du C.N.R.S. associée à l'Université Henri Poincaré, Nancy, 17, rue Notre-Dame des Pauvres, B.P. 5, F 54501 Vandœuvre-lès-Nancy, France
O. Barres
Affiliation:
Laboratoire “Environnement et Minéralurgie”, U.R.A. 235 du C.N.R.S., B.P. 40, F 54501 Vandœuvre-lès-Nancy, France
R. Nüesch
Affiliation:
Labor für Tonmineralogie, Institut für Geotechnik ETHZ, CH 8092 Zürich, Switzerland
J. Berthelin
Affiliation:
Centre de Pédologie Biologique, U.P.R. 6831 du C.N.R.S. associée à l'Université Henri Poincaré, Nancy, 17, rue Notre-Dame des Pauvres, B.P. 5, F 54501 Vandœuvre-lès-Nancy, France
A. J. Herbillon
Affiliation:
Centre de Pédologie Biologique, U.P.R. 6831 du C.N.R.S. associée à l'Université Henri Poincaré, Nancy, 17, rue Notre-Dame des Pauvres, B.P. 5, F 54501 Vandœuvre-lès-Nancy, France
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Abstract

Isomorphic substitution in goethites is common in nature and the properties of goethites generally change as a function of the degree of substitution (e.g. Al-goethites). In synthetic goethites, substitution by other elements such as Co is also known. Recent literature indicates that the influence of Al and Co on the unit-cell dimensions of goethite is similar. In contrast to Al-goethites, however, little is known about other properties of Co-goethites and in this study some properties of synthetic Co-goethites were investigated by XRD, IR, TEM, TGA and reductive dissolution techniques. Eight goethite samples (S1 to S8) with varying Co concentrations were synthesized from mixed alkaline solutions of Fe(III) nitrate and Co(II) nitrate, aged at 63°C and ambient pressure. The goethites contained up to 9.5 mol.% Co. Their redness increased with Co concentration, e.g. 0.5 Y 6.0/6.4 for S1 and 6.4 YR 3.3/3.2 for S8. Surface area ranged from 46 to 88 m2/g. Unit-cell parameters a, b, c and v all showed a negative linear dependency on the Co concentration of the goethites. Transmission and diffuse reflectance IR spectrometry showed the presence of strong bands which were interpreted as v-OH, δ-OH and γ-OH vibrations. The δ-OH and γ-OH band positions showed a positive linear dependency on the Co concentration of the samples. Dehydroxylation occurred between 280 and 315°C and dehydroxylation peak positions tended to decrease with increasing Co concentrations. As with Al-goethites, Co-goethite reductive dissolution rates decreased parabolically with increasing substitution. X-ray diffraction and IR analyses, TGA and congruent reductive dissolution suggest the existence of single phases, i.e. Co-goethites of varying degrees of isomorphic substitution.

Type
Research Article
Information
Clay Minerals , Volume 31 , Issue 4 , December 1996 , pp. 465 - 476
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1996

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