활성화 벤토나이트를 이용한 수용액으로부터 세슘 흡착 제거

Various treatment methods have been applied to remove cesium in aqueous solution, and adsorption using clay minerals has also been widely used. Bentonite has been highly evaluated as an adsorbent material for the purification of radioactive materials. In this study, bentonite was used for cesium removal, and bentonite was activated by acid to improve cesium removal efficiency. To investigate the adsorption characteristics of cesium by using activated bentonite, pH, initial cesium concentration, time, background electrolyte and interference ion experiment. As a result of pH test, it was found that activated bentonite was more effective for cesium removal than bentonite at pH 4 or higher. The maximum amount of cesium adsorbed by the activated bentonite was 12.8 mg/g, followed by Langmuir adsorption isotherm and pseudo second order model. The adsorption of Cs on the background electrolyte appeared to be a non - specific adsorption affected by the background electrolyte. The anions did not affect cesium adsorption, but the cations were affected by Cs adsorption due to competitive adsorption.