Sorption of selenium oxyanions on TiO2 (rutile) studied by batch or column experiments and spectroscopic methods |
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Authors: | Svecova Lenka Dossot Manuel Cremel Sébastien Simonnot Marie-Odile Sardin Michel Humbert Bernard Den Auwer Christophe Michot Laurent J |
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Affiliation: | Laboratoire Réactions et Génie des Procédés, UPR CNRS n 3349, 1, rue Grandville BP 20451 54001 Nancy Cedex, France. |
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Abstract: | Selenium is a known toxic element released in the environment by anthropogenic activities. The present study is devoted to the aqueous sorption behaviour of selenium oxyanions (selenate and selenite) on a reference oxide surface, namely rutile TiO(2). Batch sorption kinetics and isotherms have been studied using different physico-chemical conditions of the solution (changes of pH and ionic strength). The sorption was favoured for both anions in acidic conditions, in agreement with a surface complexation mechanism and CD-MUSIC predictions. Spectroscopic investigations of the sorbed rutile powder were also consistent with such a mechanism. EXAFS spectra confirmed that for selenite anions, an inner-sphere mechanism was the most probable process observed. Dynamic sorption experiments using a column filled with rutile powder also substantiated that a part of the surface complexes follows the inner-sphere mechanism, but also evidenced that an outer-sphere mechanism cannot be excluded, especially for selenate anions. |
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Keywords: | TiO2 Rutile Selenites Selenates Sorption Spectroscopy Batch Column |
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