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https://doi.org/10.37358/Rev.Chim.1949

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Revista de Chimie (Rev. Chim.), Year 2009, Volume 60, Issue 11,





Mircea Stefan, Daniela Simina Stefan
Study of Cadmium Sorption on Na-Montmorillonite

Abstract:

In order to characterize the sorption process of Cd(II) on Na - montmorillonite, the influence of the following set of operational variables was investigated: initial cadmium cations concentration, clay particle size and solution ionic strength. Equilibrium isotherms have been measured and analyzed using a Langmuir isotherm model. The metals were predominantly adsorbed on the permanent charge sites, but there was also evident a substantial involvement of the hydroxyl groups on the edges of Na-montmorillonite in specific adsorption of the cations especially at higher pH. In low ionic strength (0.01 M NaNO3) solutions, the fixation of Cd2+ appears to be controlled by a mechanism indicated of the ionic exchange. Important cadmium uptake occurred in the first ten minutes of reaction. In contrast, at high ionic strength (0.1 M NaNO3), metal cation uptake rate was much slower. Using the shrinking core model the internal diffusion of cadmium sorption process was proposed as the rate-limiting step. Keywords: cadmium, sorption, montmorillonite


Issue: 2009, Volume 60, Issue 11
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