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http://dx.doi.org/10.11001/jksww.2014.28.1.83

Effect of pH and ionic strength on the removal of radionuclide by Na-mica  

Seol, Bitna (Department of Environmental Engineering, Daejeon University)
Cho, Yunchul (Department of Environmental Engineering, Daejeon University)
Publication Information
Journal of Korean Society of Water and Wastewater / v.28, no.1, 2014 , pp. 83-89 More about this Journal
Abstract
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.
Keywords
sorption; ion exchange; Na-mica; cesium; strontium; pH; ionic strength;
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