Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
583957 | Journal of Hazardous Materials | 2008 | 6 Pages |
Abstract
Selenium is a toxic element with a relatively high mobility in the natural waters. Iron oxy-hydroxides might play an important role in the migration of this element as well as on its removal from contaminated water. In this work we study the interaction of Se(IV), and Se(VI) with natural iron oxides hematite and goethite through two series of batch experiments at room temperature. In the first series, sorption as a function of initial selenium concentration is studied and the results have been fitted with Langmuir isotherms. In a second series of experiments, sorption is studied as a function of pH, being the main trend an increase of the sorption at acidic pH. The variation of the sorption with pH has been modelled with a triple layer surface complexation model and using the FITEQL program. The experimental data have been modelled considering for the Se(IV) the formation of the FeOSe(O)Oâ complex onto the hematite surface, and a mixture of FeOSe(O)Oâ, and FeOSe(O)OH onto the goethite surface. For Se(VI) the surface complex considered is FeOH2+-SeO42â on both goethite and hematite.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Health and Safety
Authors
Miquel Rovira, Javier Giménez, MarÃa MartÃnez, Xavier MartÃnez-Lladó, Joan de Pablo, V. MartÃ, L. Duro,