GEOC 148 |
| Wojciech Piasecki, Department of Earth and Planetary Sciences, Johns Hopkins University, Charles and 34th Streets, Baltimore, MD 21218 and Dimitri A. Sverjensky, Department of Earth and Planetary Sciences, The Johns Hopkins University, Baltimore, MD 21218. |
| The triple-layer surface complexation model has been applied to analyse experimental adsorption data for the following systems: Fe3+/quartz, Cr3+/quartz, Cr3+ /silica, and Cr3+/alumina (James and Healy, 1972; Csoban and Joó, 1999). Ferric ion adsorption onto quartz can be modeled using a binuclear complex consistent with preliminary EXAFS results (Waychunas et al.). In the case of trivalent chromium adsorption onto silica, sets of adsorption data referring to different ionic strengths and initial concentrations of Cr3+ in solution appear to require at least two different surface complexes of chromium. For alumina, surface metal complexation occurs with the anion of the supporting electrolyte on the surface. |
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Interfacial Phenomena: Linking Atomistic and Macroscopic Properties
8:05 AM-11:30 AM, Wednesday, March 31, 2004 Marriott -- Marquis NW, Oral
Division of Geochemistry |