Preparation and photocatalytic activity of [PW sub(xMo) sub(1)2-xO sub(40][super]3-/TiO) sub(2) hybrid film composites

Keggin ions (PW sub(12O) sub(4)0[super]3- (PW sub(12), PW) sub(6)Mo sub(6O) sub(4)0[super]3- (PW sub(6Mo) sub(6)), PMo sub(12O) sub(4)0[super]3- (PMo sub(12)) and TiO) sub(2) hybrid thin films were prepared using the layer-by-layer (LBL) method. Their photocatalytic activities were investigated using gaseous 2-propanol (IPA) decomposition. All films were transparent in the visible wavelength range. From XPS and UV-vis spectra, it was confirmed that LBL coating was attained using the same thicknesses between Keggin ions and TiO sub(2. For IPA decomposition, PW) sub(1)2 was the most effective for the combination with TiO sub(2. The PMo) sub(1)2 possessed the highest adsorption capability against gaseous IPA, suggesting the effect of pseudo-liquid phase. Visible-light excitation of reduced Keggin ions will play an important role in the entire photocatalytic activity of IPA decomposition.