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Abstract:

Sorption of CrO42- and HAsO42- by hydrotalcite, in its chloride form, was studied as a function of anion concentration. In both cases, the shape of the isotherms is langmuirian. The maximum uptake of CrO42- equals the ion-exchange capacity of the solid, whereas sorption of HAsO42- saturates at a higher value. Chloride ions inhibit the uptake of both anions, the amount of sorbed CrO42- declining rapidly to zero. The uptake of HAsO42-, however, attains a constant value at high chloride concentrations. The excess of arsenate uptake follows, at constant pH, a langmuirian dependence with equilibrium concentration and decreases with increasing pH, depicting a marked change in slope at pHpQa3. CrO42- and HAsO42- have notable, albeit different, effects on the electrophoretic behavior of hydrotalcite; the positive particle charge is screened almost completely by CrO42-, whereas sorption of HAsO42- produces charge reversal. These results reflect the formation of inner-sphere arsenate surface complexes at the edges of hydrotalcite particles. The underlying rationale is discussed in terms of the crystal structure of hydrotalcite surfaces. © 2012 Elsevier Inc.

Registro:

Documento: Artículo
Título:Complexation at the edges of hydrotalcite: The cases of arsenate and chromate
Autor:Jobbágy, M.; Regazzoni, A.E.
Filiación:INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 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 A. Sabato, Universidad Nacional de General San Martín, Av. General Paz 1499, B1650KNA-San Martín, Argentina
Palabras clave:Adsorption; Arsenate; Chromate; Hydrotalcite; Layered double hydroxides; Surface complexation; Anion concentrations; Arsenate; Arsenate uptake; Charge reversal; Chloride concentrations; Chloride ions; Electrophoretic behavior; Equilibrium concentration; Hydrotalcite surfaces; Hydrotalcites; Ion exchange capacity; Layered double hydroxides; Particle charge; Surface complex; Surface complexation; Adsorption; Chromates; Dyes; Negative ions; Chlorine compounds; arsenic acid; chloride ion; chromic acid; hydrotalcite; article; complex formation; crystal structure; electrophoresis; ion exchange; isotherm; pH; priority journal; Adsorption; Aluminum Hydroxide; Arsenates; Chromates; Hydrogen-Ion Concentration; Magnesium Hydroxide; Surface Properties
Año:2013
Volumen:393
Número:1
Página de inicio:314
Página de fin:318
DOI: http://dx.doi.org/10.1016/j.jcis.2012.10.069
Título revista:Journal of Colloid and Interface Science
Título revista abreviado:J. Colloid Interface Sci.
ISSN:00219797
CODEN:JCISA
CAS:arsenic acid, 15584-04-0, 7778-39-4; chromic acid, 11104-59-9; hydrotalcite, 12304-65-3; Aluminum Hydroxide, 5QB0T2IUN0; Arsenates; Chromates; Magnesium Hydroxide, NBZ3QY004S; arsenic acid, N7CIZ75ZPN; hydrotalcite, 12304-65-3
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00219797_v393_n1_p314_Jobbagy

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Citas:

---------- APA ----------
Jobbágy, M. & Regazzoni, A.E. (2013) . Complexation at the edges of hydrotalcite: The cases of arsenate and chromate. Journal of Colloid and Interface Science, 393(1), 314-318.
http://dx.doi.org/10.1016/j.jcis.2012.10.069
---------- CHICAGO ----------
Jobbágy, M., Regazzoni, A.E. "Complexation at the edges of hydrotalcite: The cases of arsenate and chromate" . Journal of Colloid and Interface Science 393, no. 1 (2013) : 314-318.
http://dx.doi.org/10.1016/j.jcis.2012.10.069
---------- MLA ----------
Jobbágy, M., Regazzoni, A.E. "Complexation at the edges of hydrotalcite: The cases of arsenate and chromate" . Journal of Colloid and Interface Science, vol. 393, no. 1, 2013, pp. 314-318.
http://dx.doi.org/10.1016/j.jcis.2012.10.069
---------- VANCOUVER ----------
Jobbágy, M., Regazzoni, A.E. Complexation at the edges of hydrotalcite: The cases of arsenate and chromate. J. Colloid Interface Sci. 2013;393(1):314-318.
http://dx.doi.org/10.1016/j.jcis.2012.10.069