Abstract
Abstract PVC-Zeolite composite was prepared by immobilizing zeolite with polyvinyl chloride (PVC). The prepared PVC-Zeolite beads were characterized by using X-ray diffractometer (XRD), fourier transform infrared spectrometer (FTIR), thermo gravimetric analyzer (TGA), and scanning electron microscopy (SEM). The removal properties of Sr and Cs ions from aqueous solution were investigated in batch experiment. The removal efficiencies of Sr and Cs ions by the PVC-Zeolite beads were dependent on the initial pH of solution. The removal efficiencies sharply increased at below pH 4 and was kept constant at pH 4 or more. The adsorption kinetics of Sr and Cs ions by the PVC-Zeolite beads were fitted well by the pseudo- second-order model (r 2 >0.99) more than pseudo-first-order model. The maximum adsorption capacities of Sr and Cs ions calculated from Langmuir isotherm model were 39.37 mg/g and 55.87 mg/g, respectively. Key words : Adsorption, Zeolite, Strontium, Cesium, PVC 1. 서 론 1) 방사성 핵종을 포함하는 방사성 폐기물은 위험한 환경오염 물질이므로 그 처리에 관하여 관심이 높아지고 있다. 방사성 물질들이 체내로 들어오면 뼈에 축적되어 골수 암, 백혈병 등을 일으킨다(Gurboga와 Tel, 2005). 수중의 방사성 이온을 제거하기 위한 효과적인 처리 기술이 필요하다. 특히
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