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dc.contributor.author
Jobbagy, Matias
dc.contributor.author
Regazzoni, Alberto Ernesto
dc.date.available
2017-10-09T21:33:55Z
dc.date.issued
2012-11
dc.identifier.citation
Jobbagy, Matias; Regazzoni, Alberto Ernesto; Complexation at the edges of hydrotalcite: the cases of arsenate and chromate; Elsevier Inc; Journal of Colloid and Interface Science; 393; 11-2012; 314-318
dc.identifier.issn
0021-9797
dc.identifier.uri
http://hdl.handle.net/11336/26308
dc.description.abstract
Sorption of CrO2 4 and HAsO2 4 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 CrO2 4 equals the ion-exchange capacity of the solid, whereas sorption of HAsO2 4 saturates at a higher value. Chloride ions inhibit the uptake of both anions, the amount of sorbed CrO2 4 declining rapidly to zero. The uptake of HAsO2 4 , 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 pH pQa3. CrO2 4 and HAsO2 4 have notable, albeit different, effects on the electrophoretic behavior of hydrotalcite; the positive particle charge is screened almost completely by CrO2 4 , whereas sorption of HAsO2 4 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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Inc
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.subject
Layered Double Hydroxides
dc.subject
Chromate
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Surface Complexation
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Arsenate
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Otras Ciencias Químicas
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Ciencias Químicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Complexation at the edges of hydrotalcite: the cases of arsenate and chromate
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-08-09T14:22:40Z
dc.journal.volume
393
dc.journal.pagination
314-318
dc.journal.pais
Estados Unidos
dc.description.fil
Fil: Jobbagy, Matias. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química, Física de los Materiales, Medioambiente y Energía. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Argentina
dc.description.fil
Fil: Regazzoni, Alberto Ernesto. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Universidad Nacional de San Martín. Instituto Sabato; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.journal.title
Journal of Colloid and Interface Science
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.jcis.2012.10.069
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0021979712012647
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