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The Effect of Dissolved Ligands on the Sorption of Cu(II) by Ca-Montmorillonite

Published online by Cambridge University Press:  28 February 2024

Markus Stadler  and
Paul W. Schindler
Markus Stadler
Affiliation:
Institute for Inorganic Chemistry, University of Berne, Freiestrasse-3, 3012-Berne, Switzerland
Paul W. Schindler
Affiliation:
Institute for Inorganic Chemistry, University of Berne, Freiestrasse-3, 3012-Berne, Switzerland
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Abstract

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The effects of three organic ligands on the adsorption of copper on Ca-montmorillonite were studied. The results indicate that these effects include three different processes:

  1. 1) Enhanced uptake of positively charged copper-ligand complexes by ion-exchange.

  2. 2) Formation of ternary surface complexes involving surface aluminol groups.

  3. 3) Inhibited uptake due to competition between the surface ligands and the dissolved ligands for dissolved copper.

Ethylenediamine promotes copper uptake by ion-exchange at low pH but tends to suppress adsorption at aluminol groups by ligand competition at high pH. The same mechanisms are operative for β-alanine; however, the uptake of Cu(β-ala)+ by ion-exchange is not promoted by the attached ligand. The influence of malonate includes both ligand competition and formation of ternary complexes. A quantitative interpretation based on the surface complexation model using the least-squares programs FITEQL (Westall, 1982) and GRFIT (Ludwig, 1992) is presented. The obtained equilibrium constants are listed in Tables 2b and 3.

Keywords

Adsorptionβ-alanineCopperEthylenediamineMalonic acidModelingMontmorillonite
Type
Research Article
Information
Clays and Clay Minerals , Volume 42 , Issue 2 , April 1994 , pp. 148 - 160
Copyright
Copyright © 1994, Clay Minerals Society

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