![]() ![]() For lepidocrocite, the experimental data point to a process with a complete surface oxidation while for goethite and also HFO, data can be explained assuming a combination of Fe(II) adsorption with and without electron transfer. In both cases, an adsorbed M(III) is found in agreement with structural considerations. Analysis shows that the hydrolysis corresponds to the hydrolysis of adsorbed Al(III) for ¿-FeOOH and ¿-FeOOH. The charge distribution points to the transfer of electron charge from the adsorbed Fe(II) to the solid and the subsequent hydrolysis of the ligands that coordinate to the adsorbed ion, formerly present as Fe(II). The adsorption of Fe(II) to ferric (hydr)oxides differs. The CD value of Fe2+ adsorbed to ¿-AlOOH points to the formation of a tridentate complex, which might be a double edge surface complex. At the TiO2 (Degussa) surface, the Fe2+ ion is probably bound as a quattro-dentate surface complex. ![]() One type of surface complex is formed at TiO2 and ¿-AlOOH, i.e. The Fe(II) adsorption is discussed for TiO2, ¿-AlOOH (boehmite), ¿-FeOOH (lepidocrocite), ¿-FeOOH (goethite) and HFO (ferrihydrite) in relation to the surface structure and surface sites. The fitted CD coefficients have been linked to the mechanism of adsorption. The CD model has been used to derive the interfacial distribution of charge. The Fe(II) adsorption by non-ferric and ferric (hydr)oxides has been analyzed with surface complexation modeling. ![]()
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