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, 2014ABSTRACT : Carboxymethyl-β-cyclodextrin (β-CMCD), as a biodegradable surfactant with hydrophobic and hydrophilic properties, has potential advantages of being applicable to the simultaneous treatment of multiple contaminated soils. In this study, the desorption behaviors of radionuclides such as cobalt (Co), strontium (Sr), and cesium (Cs) from the soil contaminated with them were experimentally investigated and the effectiveness of CMCD as a desorbent was evaluated. The desorption equilibrium of used radionuclides could be achieved within 13 hr and the desorption ratio from kaolin was higher than that from natural soil. The addition of CMCD of 2 g/L increased the desorption ratio by 520 % and the desorption ratio of used radionuclides was shown in the order of Co > Cs > Sr. The experimental desorption data were fitted successfully by pseudo-second order kinetic model and the desorption rate of the radionuclides was shown in the order of Cs > Co > Sr. Hysteresis between adsorption and desorption of the radionuclides, as shown in the order of Sr > Co > Cs, increased as the desorption rate decreased. Consequently, it could be considered that the desorption rate was one of the significant factors of the hysteresis. The addition of CMCD as desorbent increased the amount of desorbed radionuclides and decreased the hysteresis. However, the CMCD could not completely desorb the radionuclides from soils even though the excess of CMCD was added.Keywords : Radionuclides, Desorption, CMCD, Desorption kinetic model, Hysteresis : Carboxymethyl-β-cyclodextrin(β-CMCD)                 .   (Co), (Sr)  (Cs)          ,  CMCD  .   Co, Sr  Cs  13    ,       .   CMCD 2 g/L    520 % ,    Co > Cs > Sr  .       , pseudo-second order kinetic model     ,  Cs > Co > Sr  . /   Sr > Co > Cs       ,  /        . CMCD    /     ,            . :  , , CMCD,  ,

Desorption Characteristics of Cobalt, Strontium, and Cesium in Natural Soil and Kaolin Using CMCD