Trivalent Chromium removal from Aqueous solution using Raw Natural Mixed Clay from Burkina Faso

Abstract

Acid-base properties of the raw mixed clay TOU from Burkina Faso, were study as well as the potential of the sample, in removing of chromium(III). The interactions of chromium(III) cation with the natural mixed clay minerals were examined using extended X-ray absorption fine structure (EXAFS) spectroscopy. Chemical elementary composition study of the mixed clay revealed presence of silicon, Aluminum and iron as mains elements. Qualitative mineralogical characterization of the clay by X-ray diffraction, point out quartz and 7 Å halloysite as the dominating component in the sample. pH_pzc of the clays, as determined by potentiometric titrations, was 8.21. Cr³⁺ adsorption on clay started at pH below pH_pzc indicating inner-sphere complexes formation. More than 95% of chromium(III) is achieved at pH greater than 7. Chromium(III) forms a tetramer hydrolysis complex on the mineral surface with Cr-O bond and Cr···Cr distances of 2.487, 3.087 and 3.636 Å, respectively, which is indicative of a chain structure with edge sharing CrO₆ octahedra.

Published in

International Research Journal of Environment Sciences
2013, volume: 2, number: 2, pages: 30-37

SLU Authors

• Persson, Ingmar

  • Department of Molecular Sciences, Swedish University of Agricultural Sciences
    

• Lundberg, Daniel

  • Department of Molecular Sciences, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Geosciences, Multidisciplinary

Permanent link to this page (URI)

https://res.slu.se/id/publ/41266