Sorption studies of Cs+ and Ba2+ cations on magnesite
Date
1998-05-11Source Title
Applied Radiation and Isotopes
Print ISSN
0969-8043
Publisher
Elsevier
Volume
49
Issue
8
Pages
915 - 921
Language
English
Type
ArticleItem Usage Stats
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Abstract
The adsorption behavior of Cs+ and Ba2+ 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 I day for both cations. The sorption data were found to follow Freundlich type isotherms. Sorption of both Cs+ and Ba2+ cations were found to be exothermic in nature with ΔH0 (kJ/mol) of -37, -13 and ΔS0 (kJ/mol·K) of -0.09, -0.009, respectively. Negative ΔG0 values were obtained for both cations, indicating the spontaneity of their sorption on magnesite. The magnitude of ΔG0 suggest that ion exchange is the dominating sorption mechanism.
The adsorption behavior of Cs+ and Ba2+ 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 Ba2+ cations were found to be exothermic in nature with ΔH0 (kJ/mol) of -37, -13 and ΔS0 (kJ/mol·K) of -0.09, -0.009, respectively. Negative ΔG0 values were obtained for both cations, indicating the spontaneity of their sorption on magnesite. The magnitude of ΔG0 suggest that ion exchange is the dominating sorption mechanism.
Keywords
Adsorption isothermsComposition effects
Enthalpy
Gibbs free energy
Magnesite
Radioisotopes
Saturation (materials composition)
Thermal effects
X ray photoelectron spectroscopy
Freundlich isotherms
Ion exchange
Barium
Cesium
Magnesium carbonate hydroxide
Unclassified drug
Adsorption
Binding kinetics
Cation transport
Concentration response
Spectrophotometry
Spectroscopy
Temperature measurement