R2: Crystal structure, crystal chemistry, physical properties of minerals, crystal growth and applied mineralogy

[R2P-02] Preparation of Cs⁺ and Er³⁺ exchange forms of GTS-type Na titanosilicate and their cation distributions

*Keiko Fujiwara¹, Naomi Kawata¹, Akihiko Nakatsuka¹ (1. Yamaguchi Uni.Sci. and Tech. for Innov.)

Keywords:microporous crystal, hydrothermal synthesis, Cs-exchange, Er-exchange, cation distribution

Investigation of the Cs⁺-exchange properties of microporous Na-GTS crystal is important for the application of GTS to the removal of Cs radioisotopes from the radioactive waste water. The Er³⁺-exchanged form of Na-GTS is promising as fluorescent materials. The Cs⁺- and Er³⁺-exchanged forms with high ion-exchange rates were obtained after the ion-exchange treatments of the hydrothermally synthesized Na-GTS. In these samples, the cation distribution of Cs⁺ and Er³⁺ in the cavity will be discussed from the comparison of the observed and simulated XRD patterns.