Sorption of Eu(III) on a natural hematite: Application of a surface complexation model
Journal Article
·
· Journal of Colloid and Interface Science
- Univ. des Saarlandes, Saabruecken (Germany). Anorganische und Analytische Chemie und Radiochemie
- Forschungszentrum Karlsruhe (Germany). Inst. fuer Nukleare Entsorgungstechnik
The solid/water interface reaction is investigated for the sorption of the Eu{sup 3+} ion onto a well-characterized natural hematite at pH {le} 6 in 0.1 mol/L NaClO{sub 4}. Sorption isotherms are determined at different pH. The sorption of Eu{sup 3+} onto hematite at coverages <1% of the surface hydroxyl groups follows the ideal Nernst behavior and can be interpreted in terms of the surface complexation by the following equilibrium reaction: {triple_bond}XOH + EU{sup 3+} {leftrightarrow} {triple_bond}XOEu{sup 2+} + H{sup +} (log K{sub x}{sup int} = 2.50 {+-} 0.19). Complexation constants are calculated by either graphically interpreting the sorption isotherms or fitting the data using the code FITEQL. At higher surface coverages a deviation from the Nernst behavior is observed which can be described satisfactorily by a two-site surface complexation model, taking into account the lateral electrostatic interaction of surface-bound Eu(III): {triple_bond}YOH + Eu{sup 3+} {leftrightarrow} {triple_bond}YOEu{sup 2+} + H{sup +} (log K{sub y}{sup int} = {minus}0.82 {+-} 0.11). The experimental results are compared with data published in the literature, and the interpretation of sorption isotherms with regard to the sorption mechanisms is critically discussed.
- OSTI ID:
- 316293
- Journal Information:
- Journal of Colloid and Interface Science, Journal Name: Journal of Colloid and Interface Science Journal Issue: 1 Vol. 208; ISSN 0021-9797; ISSN JCISA5
- Country of Publication:
- United States
- Language:
- English
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