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http://dx.doi.org/10.22807/KJMP.2022.35.1.41

Crystallographic Study on the Selectivity and Distribution of Sr2+ Ions Within Zeolite A In the Presence of Competing Na+ Ions in Aqueous Exchange Solution  

kim, Hu Sik (Department of Applied Chemistry, Andong National University)
Park, Jong Sam (Department of Radiologic Technology, Daegu Health College)
Lim, Woo Taik (Department of Applied Chemistry, Andong National University)
Publication Information
Korean Journal of Mineralogy and Petrology / v.35, no.1, 2022 , pp. 41-50 More about this Journal
Abstract
To study the properties of Sr2+ exchange into zeolite A with increasing the molar concentration of Na+ in given exchange solution, four single crystals of fully dehydrated Sr2+- and Na+- exchanged zeolite A were prepared by the bath method using mixed ion-exchange solutions. The Sr(NO3)2:NaNO3 molar rations of the ion exchange solution were 1:1(crystal 1), 1:100(crystal 2), 1:250(crystal 3), and 1:500 (crystal 4), respectively, with a total concentration of 0.05 M. The single-crystals were then vacuum dehydration at 623 K and 1×10-4 Pa for 2 days. Their single-crystal structures were determined by single-crystal synchrotron X-ray diffraction techniques in the cubic space group Pm3-m, at 100(1) K, and were then refined to the final error indices of R1/wR2=0.047/0.146, 0.048/0.142, 0.036/0.128, and 0.040/0.156 for crystals 1, 2, 3, and 4, respectively. In crystals 1 and 2, the 6 Sr2+ ions are found at three different crystallographic sites. In crystal 3, 1 Sr2+ and 10 Na+ ions are found in large cavity and sodalite unit. In crystal 4, only 12 Na+ ions occupy three equipoints. The degree of Sr2+ ion-exchange decreased sharply from 100 to 16.7 to 0% as the initial Na+ concentration increase and the Sr2+ concentration decrease. In addition, the unit cell constant of the zeolite framework decreased with this lower level of Sr2+ exchange.
Keywords
Zeolite A; Ion exchange; $Sr^{2+}$; $Na^+$; Crystallography;
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