In situ potassium and hydrogen ion exchange into a cubic zirconium silicate microporous material

Lively, Jason; Celestian, Aaron J.; Koppala, ed., Sivasankar

doi:10.1371/journal.pone.0298661

Title: In situ potassium and hydrogen ion exchange into a cubic zirconium silicate microporous material

Journal Article · 21 March 2024 · PLoS ONE

DOI: https://doi.org/10.1371/journal.pone.0298661 · OSTI ID:2326126

;

; Koppala, ed., Sivasankar

The selective separation of ions from aqueous systems, and even in the human body, is a crucial to overall environmental management and health. Nanoporous materials are widely known for their selective removal of cations from aqueous media, and therefore have been targeted for use as a pharmaceutical to treat hyperkalemia. This study investigated the detailed crystallographic molecular mechanisms that control the potassium ion selectivity in the nanoporous cubic zirconium silicate (CZS) related materials. Using time-resolved in situ Raman spectroscopy and time-resolved in situ X-ray diffraction, the selectivity mechanisms were determined to involve a synchronous cation-cation repulsion process that serves to open a favorable coordination bonding environment for potassium, not unlike the ion selectivity filter process found in potassium ion channels in proteins. Enhancement of ion exchange was observed when the CZS material was in a partial protonated state (≈3:1 Na:H), causing an expansion of the unit-cell volume, enlargement of the 7 member-ring window, and distortion of framework polyhedra, which allowed increased accessibility to the cage structures and resulted in rapid irreversible potassium ion exchange.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 2326126

Journal Information:: PLoS ONE, Journal Name: PLoS ONE Journal Issue: 3 Vol. 19; ISSN 1932-6203

Publisher:: Public Library of Science (PLoS)Copyright Statement

Country of Publication:: United States

Language:: English

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