Abstract
In this study, we used chemical quantum methods to analysis the adsorption of chloride on Al and Fe-(hydr)oxide clusters. Inner and outer sphere complexes were the generating complexes during the adsorption process on variably charged Al- and Fe-(hydr)oxide clusters. For the chloride adsorption on Al-(hydr)oxide, the outer sphere complexes—H-bonded—were favored for all clusters, while the adsorption modes as inner sphere complexes—BB or MM—were not favored. It was found, that the H-bonded complex on neutral clusters was the most thermodynamically favored with an adsorption energy of − 63.4 kJ/mol. For iron clusters, thermodynamic favorability was observed for both outer (− 70.5 kJ/mol) and inner monodentate (− 65.8 kJ/mol) sphere complexes. These theoretical results indicated that the thermodynamic favorability of chloride adsorption on Fe and Al-(hydr)oxide was directly related to positive surface charge.
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The authors are grateful to Universidad de Medellín. Acelas, N.Y thanks “COLCIENCIAS” for the PhD scholarship.
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Acelas, N.Y., Flórez, E. Chloride adsorption on Fe- and Al-(hydr)oxide: estimation of Gibbs free energies. Adsorption 24, 243–248 (2018). https://doi.org/10.1007/s10450-018-9939-0
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DOI: https://doi.org/10.1007/s10450-018-9939-0