The adsorption characteristics of Sr ions and Cs ions in single and binary solution by zeolite A were investigated in batch experiment. The adsorption rate of Sr ions and Cs ions by zeolite A obeyed pseudo-second-order kinetic model in single and binary solution. The initial adsorption rates (h) and adsorption capacities of both ions obtained from pseudo-second-order kinetic model, and the values were decreased with increasing concentration of the competitive ions (0~1.5 mM). Also, adsorption isotherm data in binary solution were well fitted to the extended Langmuir model, the maximum adsorption capacities of Sr and Cs calculated from the model were 1.78 mmol/g and 1.64 mmol/g, respectively. The adsorption of Sr and Cs ions by zeolite A was carried out in the presence of other cations such as Na+, K+, Mg2+, and Ca2+. The results showed that the zeolite A can maintain a relatively high adsorption capacity for Sr and Cs ions and exhibits a high selectivity in the presence of competitive cations. The effect of competition had an order of Ca2+>K+>Mg2+>Na+ for Sr ions and K+>Ca2+>Na+>Mg2+ for Cs ions at the same cation concentration.

Abstract
 1. 서 론
 2. 재료 및 실험 방법
  2.1. 재료
  2.2. 실험방법
 3. 결과 및 고찰
  3.1. 특성분석
  3.2. 시간에 따른 흡착량 변화
  3.3. 속도식 해석
  3.4. 흡착등온식
  3.5. 공존이온의 영향
 4. 결론
 REFERENCE

• 이창한(부산가톨릭대학교 환경행정학과) | Chang-Han Lee (Department of Environmental Adminstration, Catholic University of Pusan)
• 박정민(부경대학교 화학공학과) | Jeong-Min Park (Department of Chemical Engineering, Pukyong National University)
• 이민규(부경대학교 화학공학과) | Min-Gyu Lee (Department of Chemical Engineering, Pukyong National University) Corresponding author