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Chromium (iii) adsorption in natural bentonite

Author(s): Gilvanise Alves Tito | Lúcia Helena Garófalo Chaves

Journal: Engenharia Ambiental : Pesquisa e Tecnologia
ISSN 1678-2178

Volume: 6;
Issue: 3;
Start page: 291;
Date: 2009;
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Keywords: Removal | pH | Langmuir | Freundlich

Mineral clays have been extensively used for heavy metal removal using precipitation, ion exchange and adsorption processes. The present investigation assessed the adsorption of Cr (III) solution by natural bentonite varying the pH and to evaluated Langmuir and Freundlich isotherms applied to this adsorption. In order to quantify the adsorbed Cr, 2 g of bentonite were stired in polyethylene tubes, for 2 h, with 20 mL of solution containing different quantities of Cr (10; 15; 20; 30; 50; 100; 150 and 200 mg Cr L-1) adjusted to pH 4, 5 and 6. Chromium adsorption is dependent on pH with higher adsorption at pH higher. Freundlich model was the best fit to experimental data. Langmuir and Freundlich models are not adequate to describe the adsorption of chromium by bentonite as the type curves are concave, considered unfavorable.
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