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      Sorption studies of Cs+ and Ba2+ cations on magnesite

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      Author(s)
      Shahwan, T.
      Süzer, Şefik
      Erten, H. N.
      Date
      1998-05-11
      Source Title
      Applied Radiation and Isotopes
      Print ISSN
      0969-8043
      Publisher
      Elsevier
      Volume
      49
      Issue
      8
      Pages
      915 - 921
      Language
      English
      Type
      Article
      Item 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 isotherms
      Composition 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
      Permalink
      http://hdl.handle.net/11693/11017
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/S0969-8043(97)10096-3
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