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.

引用

页码：67 / 71

页数：5

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