Cadmium removal from aqueous solutions by hydroxy-8 quinoleine intercalated bentonite

被引:31
作者
Bentouami, A [1 ]
Oulai, MS [1 ]
机构
[1] Univ Mostaganem, Lab Valorisat Mat, Mostaganem, Algeria
关键词
bentonite; 8-hydroxyquinoleine; cadmium; complexation;
D O I
10.1016/j.jcis.2005.06.040
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
收藏
页码:270 / 277
页数:8
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