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Abstract:

The intercalation of hexacyanoferrate(III) in chloride-hydrotalcite was studied as a function of the composition of the equilibrated aqueous phase, the relevant solution variable being the ratio (CFe(CN)6 3-)1/3/CCr. The isotherm shows that the exchange is markedly nonideal and reveals the segregation of two solid phases of fixed compositions at (CFe(CN)63-)1/3/C Cr =17.1 M-2.3. This is the first case of solid phase segregation during anion exchange in hydrotalcite systems diagnosed from thermodynamic measurements. In agreement, PXRD patterns of the partially exchanged solids indicate that these phases, with distinct basal spacings, coexist in the range 0.21 ≤ x ≤ 0.86. The observed behavior is accounted for by classical thermodynamic formalisms of ion exchange. The limitations of other representations commonly used to describe anion exchange in layered double hydroxide systems are stressed. A rationale of the structural changes accompanying the exchange is also offered.

Registro:

Documento: Artículo
Título:Anion-exchange equilibrium and phase segregation in hydrotalcite systems: Intercalation of hexacyanoferrate(III) ions
Autor:Jobbágy, M.; Regazzoni, A.E.
Filiación:INQUIMAE, Fac. de Ciencias Exactas y Naturales, Ciudad Universitaria, 1428-Buenos Aires, Argentina
Unidad de Actividad Química, Centro Atómico Constituyentes, Comn. Nac. de Ener. Atómica, Av. General Paz 1499, 1650-San Martín, Argentina
Inst. de Tecn. Jorge A. Sabato, Univ. Nac. de Gen. San Martín, Av. General Paz 1499, 1650-San Martín, Argentina
Palabras clave:Carbon dioxide; Chemisorption; Gibbs free energy; Integration; Negative ions; Nitrogen; Transmission electron microscopy; Water; X ray diffraction analysis; Anion intercalation; Elemental analysis; Hydroxide systems; Layered double hydroxides (LDH); Ion exchange
Año:2005
Volumen:109
Número:1
Página de inicio:389
Página de fin:393
DOI: http://dx.doi.org/10.1021/jp046063b
Título revista:Journal of Physical Chemistry B
Título revista abreviado:J Phys Chem B
ISSN:15206106
CODEN:JPCBF
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15206106_v109_n1_p389_Jobbagy

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Citas:

---------- APA ----------
Jobbágy, M. & Regazzoni, A.E. (2005) . Anion-exchange equilibrium and phase segregation in hydrotalcite systems: Intercalation of hexacyanoferrate(III) ions. Journal of Physical Chemistry B, 109(1), 389-393.
http://dx.doi.org/10.1021/jp046063b
---------- CHICAGO ----------
Jobbágy, M., Regazzoni, A.E. "Anion-exchange equilibrium and phase segregation in hydrotalcite systems: Intercalation of hexacyanoferrate(III) ions" . Journal of Physical Chemistry B 109, no. 1 (2005) : 389-393.
http://dx.doi.org/10.1021/jp046063b
---------- MLA ----------
Jobbágy, M., Regazzoni, A.E. "Anion-exchange equilibrium and phase segregation in hydrotalcite systems: Intercalation of hexacyanoferrate(III) ions" . Journal of Physical Chemistry B, vol. 109, no. 1, 2005, pp. 389-393.
http://dx.doi.org/10.1021/jp046063b
---------- VANCOUVER ----------
Jobbágy, M., Regazzoni, A.E. Anion-exchange equilibrium and phase segregation in hydrotalcite systems: Intercalation of hexacyanoferrate(III) ions. J Phys Chem B. 2005;109(1):389-393.
http://dx.doi.org/10.1021/jp046063b