Determination of surface ionization and complexation constants at colloidal aluminum oxide/electrolyte interface

Abstract

The sorption of various inorganic anions (nitrate, chloride, bromide, and iodide) at a colloidal aluminum oxide/water interface was investigated by the Potentiometric titration method. The triple-layer model was applied to interpret the experimental data obtained. The intrinsic protonation constant of hydroxyl groups () was determined and is given as a mean value of 4.9. The intrinsic surface complexation constants (p★ ) for nitrate, chloride, bromide, and iodide were determined and are presented as 5.6, 5.4, 5.5, and 5.5, respectively. The values obtained indicate that the sorption of all the anions examined has mainly a nonspecific character. © 1994, Taylor & Francis Group, LLC. All rights reserved.