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Abstract:

Aqueous dissolution of a synthetic chloride-containing Mg2+-Al3+ layered double hydroxide was studied at 298K as a function of pH. Mild acidification (final pH 9 -5) results in incongruent dissolution of Mg2+, exclusively. Formation of an amorphous Al(OH)3 passive layer prevents further Mg2+ leaching, thus dissolved Mg2+ amounts for only 20% of the solid. At lower pH values, massive dissolution readily takes place in a congruent fashion. Congruent dissolution profiles are accounted for by a contracting volume kinetic law. The pH dependence of the observed rate constant shows that the kinetic order on proton concentration is 0.41, indicating that dissolution is surface controlled. The implications of these findings are discussed. © 2010 Elsevier B.V.

Registro:

Documento: Artículo
Título:Dissolution of nano-size Mg-Al-Cl hydrotalcite in aqueous media
Autor:Jobbágy, M.; Regazzoni, A.E.
Filiación:INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II, Ciudad Universitaria, C1428EHA-Buenos Aires, Argentina
Gerencia Química, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Av. General Paz 1499, B1650KNA-San Martín, Argentina
Instituto de Tecnología Jorge Sabato, Universidad Nacional de General San Martín, Av. General Paz 1499, B1650KNA-San Martín, Argentina
Palabras clave:Dissolution kinetics; Hydrotalcite; Layered double hydroxide; Amorphous al3; Aqueous dissolution; Aqueous media; Congruent dissolutions; Dissolution kinetics; Final pH; Hydrotalcites; Kinetic order; Layered double hydroxides; Nano-size; Passive layer; PH dependence; pH value; Proton concentrations; Volume kinetics; Aluminum; Chlorine compounds; Leaching; Rate constants; Dissolution; acidification; aluminum; aqueous solution; chloride; dissolution; hydrotalcite; hydroxide; magnesium; pH; reaction kinetics
Año:2011
Volumen:51
Número:3
Página de inicio:366
Página de fin:369
DOI: http://dx.doi.org/10.1016/j.clay.2010.11.027
Título revista:Applied Clay Science
Título revista abreviado:Appl. Clay Sci.
ISSN:01691317
CODEN:ACLSE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01691317_v51_n3_p366_Jobbagy

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Citas:

---------- APA ----------
Jobbágy, M. & Regazzoni, A.E. (2011) . Dissolution of nano-size Mg-Al-Cl hydrotalcite in aqueous media. Applied Clay Science, 51(3), 366-369.
http://dx.doi.org/10.1016/j.clay.2010.11.027
---------- CHICAGO ----------
Jobbágy, M., Regazzoni, A.E. "Dissolution of nano-size Mg-Al-Cl hydrotalcite in aqueous media" . Applied Clay Science 51, no. 3 (2011) : 366-369.
http://dx.doi.org/10.1016/j.clay.2010.11.027
---------- MLA ----------
Jobbágy, M., Regazzoni, A.E. "Dissolution of nano-size Mg-Al-Cl hydrotalcite in aqueous media" . Applied Clay Science, vol. 51, no. 3, 2011, pp. 366-369.
http://dx.doi.org/10.1016/j.clay.2010.11.027
---------- VANCOUVER ----------
Jobbágy, M., Regazzoni, A.E. Dissolution of nano-size Mg-Al-Cl hydrotalcite in aqueous media. Appl. Clay Sci. 2011;51(3):366-369.
http://dx.doi.org/10.1016/j.clay.2010.11.027