(H3O)TiNbO5·0.26H2O powder was prepared from layered titanoniobate, KTiNbO5, using an ion-exchange reaction in acidic aqueous solution. X-ray diffraction, thermogravimetry-differential thermal analysis, energy-dispersive X-ray analysis and infrared spectral data gave the first experimental evidence that the so-called proton-exchanged form HTiNbO5 involves hydrated water or hydrated hydronium ion. The intercalation of water or hydronium ion in KTiNbO5 was not achieved by the conventional high-temperature solid-state reaction method but by the low-temperature polymerizable complex (PC) method. While KTiNbO5 via the PC route, combined with Pt, showed only little improvement of the photocatalytic activity with respect to H2 evolution from aqueous methanol solution, the water or hydronium ion intercalated species, (H3O)TiNbO5·0.26H2O, with Pt loading, showed much higher activities than the others species studied by an order of magnitude.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry