%0 Journal Article
%T Removal of Pb2+ ions in aqueous phase by a sodic Montmorillonite
%A Zoubida Lounis
%A Smail Saddouki
%A Fatiha Djafri
%J Journal of Analytical Science & Technology
%D 2012
%I 
%X The sorption of Pb2+ ions in aqueous phase was carried out using sodium bentonite. The influence of the temperature and the pH on the capacity of the sorption and the percentage of the uptake of Pb2+ ions by sodium montmorillonite were studied. The sorption data were analysed in terms of the Freundlich and Langmuir isotherm models and the data fit the Langmuir sorption isotherm model well. Whereas, the thermodynamic parameters( the heat of adsorption ¦¤ H¡ã, the entropy ¦¤ S¡ã and the free energy ¦¤G¡ã) showed that the sorption is a phenomenon of exchange cation between adsorbat /adsorbent The negative value of ¦¤G¡ã indicates that the sorption of Pb2+ ions on Na-Mt is spontaneous. The positive value of entropy ¦¤S¡ã means that the disorder is at the interface solid-solution. The negative value of the heat of sorption ¦¤H¡ã means that the process of elimination of Pb2+ ions is exothermic. However, it appears that the affinity sorption of Pb+2 ions on our clay decreases with increasing the temperature as the sorption capacity
%K pollution water
%K sorption
%K heavy metals
%K smectite
%K lead ions
%K Montmorillonite
%U http://www.jastmag.org/journal/view.php?number=47