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Abstract:

A set of synthetic goethites were prepared from Fe3+- and Co2+-nitrate solutions in alkaline media with a Co/(Co + Fe) ratio (xCo) up to 10 mol%. The structural characterization of the resultant solid phases was carried out by X-ray diffraction (XRD). XRD analyses showed that in preparations with xCo <10 mol%, Co-substituted goethite was the only crystalline phase present. Atomic and cell parameters for the samples synthesized were obtained by the Rietveld refinement of the XRD data, and showed that the unit cell in the goethite-like phase is contracted as a function of xCo. Little deviation from the Vegard rule was observed for all unit-cell parameters. Cobalt substitution produces an increase in the surface area of the goethite, as well as an increment in the dehydroxylation temperature. The acid dissolution of all Co-goethites showed an increase in dissolution rate with the Co content, and a congruent behavior was observed. The activation energy for dissolution was obtained two samples. A modified first-order Kabai equation best describes the dissolution data.

Registro:

Documento: Artículo
Título:Structure and reactivity of synthetic Co-substituted goethites
Autor:Alvarez, M.; Sileo, E.E.; Rueda, E.H.
Filiación:Departamento de Química, Universidad Nacional del Sur, Avenida Alem 1253, B8000CPB Bahía Blanca, Argentina
INQUIMAE, Departamento de Química Inorgánica Analítica y Química Física, Universidad de Buenos Aires, Buenos Aires, Argentina
Palabras clave:Acid dissolution; Co-goethite; Isomorphous substitution; Rietveld refinement; chemical composition; cobalt; crystal chemistry; crystal structure; dissolution; goethite; nitrate; phase transition; Rietveld analysis; X-ray diffraction
Año:2008
Volumen:93
Número:4
Página de inicio:584
Página de fin:590
DOI: http://dx.doi.org/10.2138/am.2008.2608
Título revista:American Mineralogist
Título revista abreviado:Am. Mineral.
ISSN:0003004X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0003004X_v93_n4_p584_Alvarez

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Citas:

---------- APA ----------
Alvarez, M., Sileo, E.E. & Rueda, E.H. (2008) . Structure and reactivity of synthetic Co-substituted goethites. American Mineralogist, 93(4), 584-590.
http://dx.doi.org/10.2138/am.2008.2608
---------- CHICAGO ----------
Alvarez, M., Sileo, E.E., Rueda, E.H. "Structure and reactivity of synthetic Co-substituted goethites" . American Mineralogist 93, no. 4 (2008) : 584-590.
http://dx.doi.org/10.2138/am.2008.2608
---------- MLA ----------
Alvarez, M., Sileo, E.E., Rueda, E.H. "Structure and reactivity of synthetic Co-substituted goethites" . American Mineralogist, vol. 93, no. 4, 2008, pp. 584-590.
http://dx.doi.org/10.2138/am.2008.2608
---------- VANCOUVER ----------
Alvarez, M., Sileo, E.E., Rueda, E.H. Structure and reactivity of synthetic Co-substituted goethites. Am. Mineral. 2008;93(4):584-590.
http://dx.doi.org/10.2138/am.2008.2608