Issue 27, 2014

Bionanocomposites based on layered silicates and cationic starch as eco-friendly adsorbents for hexavalent chromium removal

Abstract

Functional bionanocomposites based on two layered silicates, the commercial montmorillonite known as Cloisite®Na and a natural bentonite from Algeria, were prepared by intercalation of cationic starch, synthesized with two different degrees of substitution, 0.85 and 0.55. After characterization of the prepared bionanocomposites by XRD and zeta potential measurements, batch studies were conducted to evaluate the adsorption capacity of hexavalent chromium anions from aqueous solution. The adsorption isotherms, adsorption kinetics, and the effect of pH on the process were studied. The removal efficiency was evaluated in the presence of competing anions such as NO3, ClO4, SO42− and Cl. In order to regenerate the adsorbent for its repeated use, the regeneration process was studied in two different extractant solutions, 0.1 M NaCl at pH 10 and 0.28 M Na2CO3 at pH 12.

Graphical abstract: Bionanocomposites based on layered silicates and cationic starch as eco-friendly adsorbents for hexavalent chromium removal

Supplementary files

Article information

Article type
Paper
Submitted
30 yan 2014
Accepted
25 fev 2014
First published
24 mar 2014

Dalton Trans., 2014,43, 10512-10520

Author version available

Bionanocomposites based on layered silicates and cationic starch as eco-friendly adsorbents for hexavalent chromium removal

Y. Koriche, M. Darder, P. Aranda, S. Semsari and E. Ruiz-Hitzky, Dalton Trans., 2014, 43, 10512 DOI: 10.1039/C4DT00330F

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