Adsorption of heavy metal ions from aqueous solutions by amine and carboxylate functionalised bentonites

被引：97
作者：
Anirudhan, T. S. [1 ]
Jalajamony, S. [1 ]
Sreekumari, S. S. [1 ]
机构：
[1] Univ Kerala, Dept Chem, Trivandrum 695581, Kerala, India
来源：
APPLIED CLAY SCIENCE | 2012年 / 65-66卷
关键词：
Bentonite; 3-aminopropyl trimethoxysilane; Heavy metal ions; Adsorption; MONTMORILLONITE; REMOVAL;
D O I：
10.1016/j.clay.2012.06.005
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：
Amine and carboxylate functionalised bentonites were used as adsorbents of heavy metal ions (Pb(II), Hg(II) and Cu(II)) from aqueous solutions. 3-aminopropyl trimethoxysilane was grafted on sodium bentonite (Bent), and this amine functionalised bentonite (Bent-NH2) was converted into a carboxylate functionality (Bent-COOH) by reaction with succinic anhydride. Both adsorbents were characterised by FTIR, XRD, TG/DTG, SEM and elemental analyses. Both adsorbents showed maximum adsorption of the metal ions at pH 5.0-6.0. The adsorption processes followed pseudo-second-order kinetics. The Freundlich model best fitted the adsorption data. The metal ions were mainly bound by complexation on Bent-NH2 and on Bent-COOH by ion exchange and complexation. The regeneration of the adsorbents was tested by repeated adsorption-desorption studies. (C) 2012 Elsevier B.V. All rights reserved.
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收藏
页码：67 / 71
页数：5
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