Competitive Adsorption in Binary Solution with Different Mole Ratio of Sr and Cs by Zeolite A : Adsorption Isotherm and Kinetics

스트론튬과 세슘 이온의 혼합 몰비를 달리한 이성분 용액에서 제올라이트 A에 의한 경쟁 흡착: 흡착등온 및 속도해석

  • Received : 2014.09.04
  • Accepted : 2014.11.12
  • Published : 2015.02.27


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 $Na^+$, $K^+$, $Mg^{2+}$ and $Ca^{2+}$. 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 $Ca^{2+}$ > $K^+$ > $Mg^{2+}$ > $Na^+$ for Sr ions and $K^+$ > $Ca^{2+}$ > $Na^+$ > $Mg^{2+}$ for Cs ions at the same cation concentration.


Adsorption;Zeolite;Strontium;Cesium;Binary;Extended Langmuir isotherm


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