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Surface Complexation Modeling of Yb(III), Ni(II), and Cs(I) Sorption on Magnetite

✍ Scribed by Nicolas Marmier; Annie Delisée; Francine Fromage

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 101 KB
Volume: 211
Category: Article
ISSN: 0021-9797
DOI: 10.1006/jcis.1998.5968

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✦ Synopsis

The sorption of ytterbium, nickel, and cesium on magnetite is studied via experiments. The affinity of the magnetite surface is greater for ytterbium, then nickel, and nonexistent for cesium. Three different surface complexation models, with three different electrostatic descriptions of the interface, are used to fit the experiment data. These descriptions are given by the double layer model (DLM), the constant capacitance model (CCM), and a nonelectrostatic model (NEM). The results of fits give the same stoichiometries for the surface reactions for the three tested models in similar surface loading conditions. The values of the surface constants obtained are the same, taking into account the error for DLM and CCM. NEM gives different values, even if the fit quality is comparable.

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✍ Nicolas Marmier; Annie Delisée; Francine Fromage 📂 Article 📅 1999 🏛 Elsevier Science 🌐 English ⚖ 90 KB

A surface complexation model is used to describe sorption of ytterbium and cesium on the silica surface. The constant capacitance model gives the description of the solid-solution interface chosen for this work. The first step in the modeling consists of extracting the surface acidity constants. The