| 초록 |
In this study, we investigated the behavior of cesium desorption from hydrobiotite by cationic polyelectrolyte and hydrogen peroxide. Polyethyleneimine (PEI) was selected as a cationic polyelectrolyte. PEI is fully hydrophilic and contains ionizable amine groups in the repeating unit. Therefore, the high cationic charge of the polyelectrolyte originating from its large number of ionizable unit was effective for Cs desorption from mixed-layer clay minerals. Hydrogen peroxide (H2O2) is known to cause the exfoliation, which is related to the separation of silicate layers with oxygen formed by the decomposition of peroxide and to the disruption of the equilibrium between the layers and the interlayer cations due to vigorous release of hydroxide groups from the structure. Thus, the expansion of the clay interlayer resulting from the inclusion of oxygen from H2O2 and the cation exchange by Mg ion had a synergetic effect on the Cs desorption from hydrobiotite. |
