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KMID : 1024520150240020151
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Journal of the Environmental Sciences
2015 Volume.24 No. 2 p.151 ~ p.162
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Competitive Adsorption in Binary Solution with Different Mole Ratio of Sr and Cs by Zeolite A : Adsorption Isotherm and Kinetics
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Lee Chang-Han
Park Jeong-Min
Lee Min-Gyu
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Abstract
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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.
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KEYWORD
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Adsorption, Zeolite, Strontium, Cesium, Binary, Extended Langmuir isotherm
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