Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 293, Issue 2, Pages 270-277Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2005.06.040
Keywords
bentonite; 8-hydroxyquinoleine; cadmium; complexation
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An Algerian bentonite was purified and modified by intercalation of 8-hydroxyquinolinium ion. These materials were characterized by X-ray diffraction, infrared spectroscopy, and thermal analysis. Comparative batch experiments were performed using bentonite-oxine complex (B-oxine) and sodic bentonite (B-Na) for removing cadmium from aqueous solutions. Kinetics study results of cadmium removal with B-Na and B-oxine fit a pseudo-second-order model. The adsorption isotherm data follow the Langmuir equation in which parameters were calculated. B-oxine has a better cadmium removal capacity (61.35 mg/g) than B-Na (29.41 mg/g). Calculated thermodynamic parameters using the van't Hoff equation showed that the removal process is endothermic with B-oxine and exothermic with B-Na. A mechanism of ion exchange followed by complexation-precipitation is suggested for cadmium removal with B-oxine. (c) 2005 Elsevier lnc. All rights reserved.
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