개질 점토 및 생선뼈를 이용한 토양 내 방사성 핵종(Co, Sr) 흡착 및탈착 특성 평가 = Assessment of Radionuclides(Co, Sr) Adsorption and Desorption Characteristics in Soil Using Modified Clay and Fish Bones

다국어 초록 (Multilingual Abstract)

The improper management of radioactive waste or accidents caused by natural disasters can result in the release ofradioactive materials into the surrounding environment, potentially leading to soil and groundwater contamination byradionuclides. In this study, adsorption-desorption behaviors of the radionuclides (cobalt and strontium) in natural soil,montmorillonite, Mn-PILC, Fe-PILC, and fishbone were investigated. Several models were used to predict adsorptionisotherms of radionuclides on various absorbents. Adsorption isotherms of cobalt and strontium in several adsorbents wereexamined at pH 5.5. The amount of sorbed cobalt and strontium were represented fishbone > natural soil > Mn-PILC >Fe-PILC > montmorillonite and natural soil > Mn-PILC > fishbone > Fe-PILC > montmorillonite, respectively. Adsorptiondatas were fitted with several models such as Freundlich, Langmuir, Sips, Redlich-Peterson, Khan, and Generalizedmodel. The results of curve fitting showed R2 > 0.98 in all of adsorption models, except Sr2+ adsorption ontomontmorillonite. For modified clays (Mn-PILC, Fe-PILC), it is suggested that, unlike natural soils and fish bones, thereare not only single adsorption mechanisms but also adsorption mechanisms based on chemical adsorption and surfacecharge. In the case of fish bones, due to the relatively higher adsorption capacity than modified clays and its characteristicof significant desorption, it is expected more suitable for the removal of radionuclides in aquatic environments than for theimmobilization of radionuclides in soil.