Thermodynamic modeling and experimental verification for ion-exchange synthesis of K₂O·6TiO₂ and TiO₂ fibers from K₂O·4TiO₂

A thermodynamic model was established to determine ion-exchange conditions for the synthesis of potassium hexatitanate (K₂O·6TiO₂) and titanium dioxide (TiO₂) from potassium tetratitanate (K₂O·4TiO₂) fiber. In the proposed model equilibrium species in the solid phase and corresponding ion-exchange equilibrium constants at 298.15K were determined from the experimental data of Sasaki et al. [Inorg. Chem. 24 (1985) 2265]. In order to verify the proposed model, prediction results were compared with experimental data determined in literature and those measured in this work. The comparison shows a good agreement. Based on this, the proposed model was also used to predict more extensive suitable conditions for the synthesis of K₂O·6TiO₂ and TiO₂.