Abstract
The adsorption behavior of Cs + and Ba 2+ cations on magnesite has been studied as a function of time, cation concentration and temperature, utilizing both the radiotracer method and X-ray photoelectron spectroscopy (XPS). Saturation was approached in about 1 day for both cations. The sorption data were found to follow Freundlich type isotherms. Sorption of both Cs + and Ba 2+ cations were found to be exothermic in nature with Δ H 0 (kJ/mol) of −37, −13 and Δ S 0 (kJ/mol·K) of −0.09, −0.009, respectively. Negative Δ G 0 values were obtained for both cations, indicating the spontaneity of their sorption on magnesite. The magnitude of Δ G 0 suggest that ion exchange is the dominating sorption mechanism.
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