Nanocrystalline low-silica X zeolite as an efficient ion-exchanger enabling fast radioactive strontium capture

  • Hyungmin Jeon 1 ,
  • Susung Lee 1 ,
  • Jeong-Chul Kim 2 ,
  • Minkee Choi , 1
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  • 1. Department of Chemical and Biomolecular Engineering (BK21 Four), Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
  • 2. Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS), Daejeon 34141, Republic of Korea
mkchoi@kaist.ac.kr

Received date: 26 Dec 2023

Accepted date: 14 Mar 2024

Copyright

2024 Higher Education Press

Abstract

NaA zeolite (Si/Al = 1.00) has been commercially applied for capturing radioactive 90Sr2+ because of its high surface charge density, effectively stabilizing the multivalent cation. However, owing to its narrow micropore opening (4.0 Å), large micron-sized crystallites, and bulkiness of hydrated Sr2+, the Sr2+ exchange over NaA has been limited by very slow kinetics. In this study, we synthesized nanocrystalline low-silica X by minimizing a water content in a synthesis gel and utilizing a methyl cellulose hydrogel as a crystal growth inhibitor. The resulting zeolite exhibited high crystallinity and Al-rich framework (Si/Al of approximately 1.00) with the sole presence of tetrahedral Al sites, which are capable of high Sr2+ uptake and ion selectivity. Meanwhile, the zeolite with a FAU topology has a much larger micropore opening size (7.4 Å) and a much smaller crystallite size (~340 nm) than NaA, which enable significantly enhanced ion-exchange kinetics. Compared to conventional NaA, the nanocrystalline low-silica X exhibited remarkably increased Sr2+-exchange kinetics (> 18-fold larger rate constant) in batch experiments. Although both the nanocrystalline low-silica X and NaA exhibited comparable Sr2+ capacities under equilibrated conditions, the former demonstrated a 5.5-fold larger breakthrough volume than NaA under dynamic conditions, attributed to its significantly faster Sr2+-exchange kinetics.

Cite this article

Hyungmin Jeon , Susung Lee , Jeong-Chul Kim , Minkee Choi . Nanocrystalline low-silica X zeolite as an efficient ion-exchanger enabling fast radioactive strontium capture[J]. Frontiers of Chemical Science and Engineering, 2024 , 18(9) : 98 . DOI: 10.1007/s11705-024-2449-6

Competing interests

The authors declare that they have no competing interests.

Acknowledgements

This research was financially supported by the institute of Civil Miltary Technology cooperation funded by the Defense Acquisition Program Administration and Ministry of Trade, Industry and Energy of Korea Government under grant No. 22-CM-BR-14.

Electronic Supplementary Material

Supplementary material is available in the online version of this article at https://doi.org/10.1007/s11705-024-2449-6 and is accessible for authorized users.
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