Na ion-exchanged zirconium phosphate crystal with high calcium ion selectivity

Fumitaka Hayashi; Yuka Shirasu; Kazunori Fujisawa; Mongkol Tipplook; Tetsuya Yamada; Katsuya Teshima

doi:10.1039/d4dt01289e

Na ion-exchanged zirconium phosphate crystal with high calcium ion selectivity

Dalton Trans. 2024 Jul 9;53(27):11252-11256. doi: 10.1039/d4dt01289e.

Authors

Fumitaka Hayashi¹, Yuka Shirasu¹, Kazunori Fujisawa², Mongkol Tipplook², Tetsuya Yamada^{1

2}, Katsuya Teshima^{1

2}

Affiliations

¹ Department of Materials Chemistry, Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan. teshima@shinshu-u.ac.jp.
² Research Initiative for Supra-Materials (RISM), Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan.

PMID: 38940199
DOI: 10.1039/d4dt01289e

Abstract

We demonstrate hydrothermally grown sodium hydrogen zirconium phosphate ((Na,H)-ZrP) crystals exhibiting high calcium ion selectivity. The standard Gibbs free energies for Ca²⁺ exchange on (Na,H)-ZrP and γ-type ZrP were estimated to be -10.1 and -4.69 kJ mol^-1, respectively. The high Ca²⁺ selectivity of (Na,H)-ZrP could be attributed to the size matching between the ion exchange site of (Na,H)-ZrP and Ca²⁺.