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

作     者：Dian-Quan Dong Jian-Guo Zheng Xian-Lian Han 

作者机构：College of Chemical EngineeringSchool of Qingdao University of Science and Technology 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2015年第34卷第10期

页      面：752-756页

核心收录：

学科分类：081702[工学-化学工艺] 0806[工学-冶金工程] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：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) the Scientific Research Starting Foundation of Qingdao University of Science and Technology,China(No.0022322) 

主　　题：Ion exchange Thermodynamics Mordenite Cesium 

摘      要：Cesium content in the seawater is 3.0 9 10-4 mg·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°*** 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(Ka) and ion free enthalpy(DG0) of mordenite for Cs+ and NH4+ are 1.455 and -930.3J·mol-1, respectively, indicating that ion exchange process of ammonium-type mordenite for cesium is a spontaneous process.