Development of Cation Exchange Processes in Geosynthetic Clay Liners
Development of Cation Exchange Processes in Geosynthetic Clay Liners
复制标题
土工合成粘土衬垫中阳离子交换工艺的发展
DOI：
10.1061/9780784484661.017
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Sample-Lord, Kristin
中科院分区：
文献类型：
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作者：
Katzenberger, Kurt D.;Hanson, James L.;Yesiller, Nazli;Tian, Kuo;Li, Dong;Sample-Lord, Kristin
在典型的实验室条件下，系统分析了常规GCL的阳离子交换特性随时间和水化液浓度的变化规律。GCL标本分别用去离子水和2 mM、50 mM和200 mM cacl2溶液水化4和8小时，1、2、4、8、16和32天。在相对高浓度的溶液（50 mM和200 mM CaCl2）中，膨润土交换络合物中结合阳离子的数量和相对比例发生了显著而迅速的变化。在去离子水和2 mM氯化钙溶液的试验中，交换络合物相对不受影响。Na+和Ca2+变化最大，K+和Mg2+变化相对较小。在高浓度水化条件下，大部分交换过程在数天内（约≤8天）完成。
An investigation was conducted to systematically analyze the cation exchange characteristics of a conventional GCL as a function of time and concentration of hydration liquid under typical laboratory conditions. GCL specimens were hydrated using DI water and 2 mM, 50 mM, and 200 mM CaCl2solutions for 4 and 8 h, and 1, 2, 4, 8, 16, and 32 days. Significant and rapid variations occurred in the amount and relative proportions of the bound cations in the exchange complex of the bentonite for the relatively high concentration solutions (50 mM and 200 mM CaCl2). The exchange complex was relatively unaffected in the tests with DI water and 2 mM CaCl2solution. The highest changes occurred in the Na+and Ca2+fractions with relatively low changes in K+and Mg2+. The majority of the exchange processes were completed within days (approximately ≤8 days) at the high concentration hydration conditions.