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Adsorption of Citric Acid by Synthetic Pseudoboehmite

Published online by Cambridge University Press:  02 April 2024

P. Cambier  and
Garrison Sposito
P. Cambier
Affiliation:
Station de Science du Sol, Institut National de la Recherche Agronomique, Route de Saint-Cyr, 78026 Versailles Cédex, France
Garrison Sposito
Affiliation:
Department of Soil Science, University of California, Berkeley, California 94720
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Abstract

The adsorption of citrate, at 10 4−10−3 M initial concentration, by pseudoboehmite suspended in 0.02 M NaC1O4 was investigated at varying pH. Citrate shows a strong affinity for the pseudoboehmite surface, as seen in the adsorption isotherm at pH 6. Adsorption envelopes of adsorbed citrate vs. pH for a given initial citrate concentration are characteristic for the adsorption of a polyprotic acid by a variable-charge mineral. The envelope data were fit well by the Constant Capacitance Model assuming a ligand-exchange adsorption mechanism, three monodentate surface species of citrate, and a reactive surface OH density of 0.4 mol kg−1. Aqueous speciation calculations suggest that solubility equilibrium with pseudoboehmite was attained at pH > 9 and that particulate or polymeric Al may have existed at 6 < pH < 9. Dissolved Al appeared to reduce the adsorption of citrate at pH < 5.5 via solution complexation reactions.

Keywords

CitratePseudoboehmiteAdsorption reactions
Type
Research Article
Information
Clays and Clay Minerals , Volume 39 , Issue 4 , August 1991 , pp. 369 - 374
Copyright
Copyright © 1991, The Clay Minerals Society

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