A surface structural model for ferrihydrite II: Adsorption of uranyl and carbonate

• Published in: Geochimica et cosmochimica acta Vol. 73; no. 15; pp. 4437 - 4451
• Main Authors: Hiemstra, Tjisse, Riemsdijk, Willem H. Van, Rossberg, André, Ulrich, Kai-Uwe
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.08.2009
• Subjects: bond-valence parameters; charge-distribution; complexation model; hexavalent uranium; ion adsorption; metal (hydr)oxides; molecular-structure; reactive transport; u(vi) adsorption; uranium(vi) adsorption

The adsorption of uranyl (UO 2 2+) on ferrihydrite has been evaluated with the charge distribution (CD) model for systems covering a very large range of conditions, i.e. pH, ionic strength, CO 2 pressure, U(VI) concentration, and loading. Modeling suggests that uranyl forms bidentate inner sphere co...