Adsorption of heavy metals on Na-montmorillonite. Effect of pH and organic substances

被引:597
作者
Abollino, O
Aceto, M
Malandrino, M
Sarzanini, C
Mentasti, E
机构
[1] Univ Turin, Dept Analyt Chem, I-10125 Turin, Italy
[2] Univ E Piedmont, Dept Sci & Adv Technol, I-15100 Alessandria, Italy
关键词
Na-montmorillonite; heavy metals; adsorption; metal complexes; breakthrough;
D O I
10.1016/S0043-1354(02)00524-9
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Clays (especially montmorillonite and bentonite) are widely used as barriers in landfills to prevent contamination of subsoil and groundwater by leachates containing heavy metals. For this reason it is important to study the adsorption of metals by these clays. The sorption of seven metals (Cd, Cr, Cu, Mn, Ni, Pb and Zn) on Na-montmorillonite was studied as a function of pH and in the presence of ligands, forming complexes of different stabilities with the metals of interest. The continuous column method was used as it better simulates natural conditions. The total capacity of Na-montmorillonite towards these metals was determined. The pH variations influence to a higher extent the concentrations of Cu, Pb and Cd in the effluent. Moreover the results suggest that complex formation hinders the sorption of the metals on the clay, with an increasing influence in the order: Mn less than or equal to Pb less than or equal to Cd less than or equal to Zn < Ni < Cu < Cr. The evaluation of the total capacity of Na-montmorillonite shows that this clay is a good sorbent towards all examined metals. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:1619 / 1627
页数:9
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