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Synthesis and ion exchange properties for Cs+ of ammonium-type mordenite

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Abstract

Cesium content in the seawater is 3.0 × 10−4mg·L-1, and ammonium-type mordenite was used to exchange cesium from cesium source. K-type mordenite was obtained by hydrothermal synthesis method. After ammonium-modified, ion exchange properties such as saturated ion exchange capacities and selectivity coefficients for alkali metal ions were determined. At the same time, ion exchange isothermal curves of ammonium-type mordenite for Cs+ and NH4 + were determined at 25 °C. Pitzer electrolyte solution theory was used to work out activity coefficients of the system, and the Kielland diagram of the ion exchange system was obtained. The calculated equilibrium constant (K a) and ion free enthalpy (ΔG 0) of mordenite for Cs+ and NH4 + are 1.455 and −930.3 J·mol−1, respectively, indicating that ion exchange process of ammonium-type mordenite for cesium is a spontaneous process.

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Acknowledgments

The study was financially supported by the National Natural Science Foundation of China (No. 51272114), the Young and Middle-aged Scientist Reward Foundation of Shandong Province, China (No. 2008BS09004), the Scientific Research Foundational Projects of Qingdao, China (No. 12-1-4-3-(8)-jch), and the Scientific Research Starting Foundation of Qingdao University of Science and Technology, China (No. 0022322).

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  1. College of Chemical Engineering, School of Qingdao University of Science and Technology, Qingdao, 266042, China

    Dian-Quan Dong, Jian-Guo Zheng & Xian-Lian Han

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  1. Dian-Quan Dong
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Correspondence to Dian-Quan Dong.

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Dong, DQ., Zheng, JG. & Han, XL. Synthesis and ion exchange properties for Cs+ of ammonium-type mordenite. Rare Met. 34, 752–756 (2015). https://doi.org/10.1007/s12598-015-0559-5

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  • DOI: https://doi.org/10.1007/s12598-015-0559-5

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