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Uptake of Ba2+ ions by natural bentonite and CaCO3: A radiotracer, EDXRF and PXRD study

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Abstract

Ba2+ uptake by natural bentonite, CaCO3 in addition to a number of bentonite-CaCO3 mixtures with variable compositions as a function of pH and Ba2+ concentration was studied. Radiotracer method, EDXRF, and PXRD were used. The results of radiotracer experiments showed that the uptake of Ba2+ by CaCO3 was larger than its uptake by natural bentonite samples, particularly at low initial concentrations of Ba2+ and higher pH values. This finding was supported by the EDXRF results. According to the sorption data, the apparent DG° values of sorption were in the range -9±1 to -13±3 kJ/mol. The PXRD studies revealed the formation of BaCO3 upon sorption of Ba2+ on pure CaCO3 and on some of the bentonite-CaCO3 mixtures.

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Authors and Affiliations

  1. Department of Chemistry, Bilkent University, 06533, Bilkent, Ankara, Turkey

    T. Shahwan, A. C. Atesin & H. N. Erten

  2. Ankara Nuclear Research and Training Center, 06100, Besevler, Ankara, Turkey

    A. Zararsiz

Authors
  1. T. Shahwan
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  2. A. C. Atesin
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  3. H. N. Erten
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  4. A. Zararsiz
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Shahwan, T., Atesin, A.C., Erten, H.N. et al. Uptake of Ba2+ ions by natural bentonite and CaCO3: A radiotracer, EDXRF and PXRD study. Journal of Radioanalytical and Nuclear Chemistry 254, 563–568 (2002). https://doi.org/10.1023/A:1021654524792

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