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Chemosphere. 2005 Jan;58(1):65-73.

Chromium(VI) sorptive removal from aqueous solutions by nanocrystalline akaganèite.

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  • 1Division of Chemical Technology, School of Chemistry, Aristotle University, Box 116, GR-54124 Thessaloniki, Greece. nlazarid@chem.auth.gr


In this study, akaganeite (beta-FeO(OH)) an ironoxyhydroxide material, was used as a low-cost potential adsorbent for the removal of hexavalent chromium from aqueous solutions. The influence of agitation speed, solution pH, initial chromium concentration, sorbent concentration and temperature were evaluated at batch kinetic runs. It was shown that the solid diffusion model, in comparison to simple reaction kinetic models, described better the sorption kinetics. Freundlich and Frumkin isotherm best fitted the equilibrium results. Akaganeite presented a sorption capacity approximately 80 mg Cr(VI) g(-1), under the conditions studied. Flotation was used as a downstream process for the effective removal of the loaded material.

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