title: Sorption of Metal Ions on Alumina
abstract: Precipitation and adsorption of metal ions (Co(II), Ni(II), Cu(II), and Cr(III)) on gamma-alumina were investigated experimentally. A surface chemical reaction model to calculate concentrations of aluminum ions, metal ions, and pH as variables depending on amount of alumina, volume of liquid and gas phase, initial metal concentration, and amount of acid or base added is presented. In the case of Co(II) the pH dependence of rest concentrations with and without alumina is equal; adsorption may be disregarded. For the other ions adsorption is important. Considering the charge of the surface does not improve the fit. In the pH region, where adsorption leads to lower rest concentrations than precipitation, adsorption may be described by a Henry isotherm. Copyright 1997 Academic Press. Copyright 1997Academic Press
authors.affiliation: Institut fur Physikalische Chemie und Elektrochemie, Heinrich-Heine Universitat Dusseldorf, Universitatsstrasse 26.33, Dusseldorf, 40225, Germany
authors.initials: E
authors.lastname: Baumgarten
authors.initials: U
authors.lastname: Kirchhausen-Dusing