Abstract
TiO2 is well-known as a photocatalysis material. One of the synthesis method of TiO2 is using ion exchange reaction of layer-structured titanates. K2Ti4O9, one of layer-structured titanates, with ion exchange ability in water, HCl, HNO3, H2SO4 and water with an ion exchange resin was measured in terms of TG/DTA and XRD analysis. More ion exchange was occurred in water with an ion exchange resin than without it. And in acids it is more exchanged than in water and in water and an ion exchagne resin.