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The aim of this study is to investigate the sorption/ion exchange of radioactive nuclides such as $Cs^+$ and $Sr^{2+}$ by synthetic Na-micas. In order to prepare Na-micas, two natural micas (phlogopite and biotite) were used as precursor materials. XRD, SEM, and EDS analyses were used to examine material characterization of synthetic Na-micas. Analyses of materials revealed that Na-micas were successfully obtained from natrual micas by K removal treatment. On the other hand, single solute (Cs or Sr) and bi-solute (Cs/Sr) sorption experiments were carried out to determine sorption capacity of Na-micas for Cs and Sr under different pH and ionic strength conditions. Uptake of Cs and Sr by micas in bi-solute system was lower than in single-solute system. Additionally, Langmuir and Langmuir competitive models were applied to describe sorption isotherm of Na-micas. bi-solute system was well described by Langmuir competitive models. For the results obtained in this study, Na-micas could be promising sorbents to treat multi-radioactive species from water and groundwater.
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참고문헌 (15)
참고문헌 신청
Al-Ash eh, S / 2000 / Predictions of binary sorption isotherms for the sorption of heavy metals by pine bark using single isotherm data / Chemosphere 41(5):659~665
Bradl, H.B / 2004 / Adsorption of heavy metal ions on soils and soils constituents / Journal of Colloid and Interface Science 277:1~18
Cho, Y / 2007 / Topotactic cation exchange in transformed micas under hydrothermal conditions / Clays and Clay Minerals 55(6):593~598
Cho, Y / 2009 / Effect of particle size on cesium exchange kinetics by K-depleted phlogopite / Applied Clay Science 43:401~407
Komar neni, S / 1988 / A Cesium-selective ion sieve made by topotactic leaching of phlogopite mica / Science 239(4845):1286~1288
Bradl, H.B / 2004 / Adsorption of heavy metal ions on soils and soils constituents / Journal of Colloid and Interface Science 277:1~18
Cho, Y / 2007 / Topotactic cation exchange in transformed micas under hydrothermal conditions / Clays and Clay Minerals 55(6):593~598
Cho, Y / 2009 / Effect of particle size on cesium exchange kinetics by K-depleted phlogopite / Applied Clay Science 43:401~407
Komar neni, S / 1988 / A Cesium-selective ion sieve made by topotactic leaching of phlogopite mica / Science 239(4845):1286~1288
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