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August 10, 2026Microporous and Mesoporous MaterialsOpen Access

Highly efficient ion-exchange for Sr2+ capture in zeolites governed by framework Al density and charge-compensating cations

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Authors

TNTaeyi NamSYShunsaku YasumuraMOMasaru Ogura

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Overview

Comparative study reveals framework aluminum density governs strontium capture in zeolites, highlighting principles for designing radioactive waste adsorbents.

Key Points

  • To determine the structural and compositional mechanisms governing strontium ion-exchange capacity and selectivity across varied zeolite frameworks.
  • Evaluated eight representative zeolites (K-A, Na-A, Ca-A, Na-X, Na-Y, Na-mordenite, Na-ZSM-5, and Na-SSZ-13) possessing distinct framework topologies and SiO2/Al2O3 ratios.
  • Investigated LTA-type zeolites modified with different charge-compensating exchange cations (K+, Na+, and Ca2+) to determine the impact of hydration and adsorption energies.
  • Strontium ion-exchange capacity is predominantly controlled by the framework SiO2/Al2O3 ratio rather than the framework topology, as higher aluminum density supplies the necessary adjacent sites for stoichiometric 1:2 exchange with Na+.
  • K-type and Na-type LTA zeolites exhibit comparable strontium exchange capacities, whereas Ca-type LTA shows substantially lower capacity due to higher cation hydration energy and strong adsorption within the framework.

Cite This Study

Nam et al. (2026) studied this question.

synapsesocial.com/papers/6aa639725175d8ad94397d71https://doi.org/10.1016/j.micromeso.2026.114355
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