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Heavy-metal uptake by a high cation-exchange-capacity montmorillonite: the role of permanent charge sites

Paper Topic: 
General
 
Volume: 
 
Issue: 
 

Pages :
248 - 255

Authors: 
Stathi P., Papadas I.T. , Tselepidou A. and Deligiannakis Y.
Paper ID: 
722
Paper Status: 
Published
Abstract: 

A High Cation Exchange Capacity (HCM) montmorillonite clay has been prepared by acetate
treatment of Zenith clay. The HCM has been evaluated for metal-uptake from aqueous solutions.
The present data show that the cation exchange sites can play a significant role in the adsorption of
metals in smectite clays. A theoretical analysis scheme has been developed which shows that
permanent-charge sites can become dominant in metal-uptake by clays. In addition, it was shown
that the permanent charge can influence the ionic-strength sensitivity of the Point of Zero Charge of
the clay.

Keywords: 
Montmorillonite; CEC; Adsorption; Heavy metals; Surface Complexation Models; Permanent charge