Artículo
Dissolution of nano-size Mg-Al-Cl hydrotalcite in aqueous media
Fecha de publicación:
02/2011
Editorial:
Elsevier Science
Revista:
Applied Clay Science
ISSN:
0169-1317
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
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.
Palabras clave:
Dissolution Kinetics
,
Hydrotalcite
,
Layered Double Hydroxide
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Colecciones
Articulos(INQUIMAE)
Articulos de INST.D/QUIM FIS D/L MATERIALES MEDIOAMB Y ENERGIA
Articulos de INST.D/QUIM FIS D/L MATERIALES MEDIOAMB Y ENERGIA
Citación
Jobbagy, Matias; Regazzoni, Alberto Ernesto; Dissolution of nano-size Mg-Al-Cl hydrotalcite in aqueous media; Elsevier Science; Applied Clay Science; 51; 3; 2-2011; 366-369
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