Ag+/ZSM-5 catalysts were prepared by an ion-exchange method and characterized by in-situ XPS, XAFS (XANES and EXAFS), UV−Vis, photoluminescence, and FT-IR investigations. These Ag+/ZSM-5 catalysts were found to exhibit an UV absorption band at around 190 nm due to the isolated Ag+ ions. The addition of N2O molecules leads to a shift in this band to 220 nm due to the adsorption of N2O on the Ag+ ions. The adsorption of N2O on the Ag+ ions could also be clarified by the appearance of characteristic FT-IR bands at 2251 cm-1. UV irradiation of the Ag+/ZSM-5 catalysts in the presence of N2O led to the photocatalytic decomposition of N2O into N2 and O2 at temperatures as low as 298 K. It was found that UV light at around 200−250 nm is effective for the reaction, suggesting that excitation of the isolated Ag+ ion plays a significant role in the photocatalytic decomposition of N2O.

A simple method for preparing high photocatalytic activity TiO 2 has been developed by controlled the hydrolysis of titanium butoxide with water generated ''in situ'' using an esterification reaction between the acetic acid and ethanol. The photocatalytic activity of the samples prepared was higher than that of the reference Degussa P25 TiO 2 for the liquid phase photocatatlytic degradation of active yellow XRG dye and cationic golden X-GL dye.

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