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Visible light-responsive TiO2 (Vis-TiO2) thin films were successfully developed by a radio-frequency (RF) magnetron sputtering deposition method. These Vis-TiO2 thin films exhibited a declined composition of the O/Ti ratio from the surface (O/Ti = 2.00) to bottom (O/Ti = 1.93), enabling the absorption of visible light. Pt-loaded Vis-TiO2 was, thus, found to decompose water involving methanol or a 0.05 M silver nitrate solution under visible light irradiation. [ABSTRACT FROM AUTHOR]

Cu(I)SAPO-5 catalysts prepared by a combination of ion-exchange and an evacuation treatment at high temperatures were found to exhibit a fairly high photocatalytic activity for the decomposition of N2O into N2 and O2 under UV-light irradiation at 298 K. In contrast to other Cu(I) catalysts, such as Cu(I)ZSM-5, the coexistence of H2O in the reaction system of the Cu(I)SAPO-5 scarcely affected the photocatalytic activity. The relationship between the photoluminescence behavior due to the presence of Cu(I) species and the photocatalytic activity of Cu(I)SAPO-5 have been investigated as a function of the Si/Al ratio, showing that the excited state of the Cu(I) species plays a significant role in the photocatalytic reaction as an active site for the reaction. [ABSTRACT FROM AUTHOR]