Study on photogeneration of hydrogen peroxide over ag/tio2 catalysts in water

In the present study, catalytic photogeneration of hydrogen peroxide has been carried out in the presence of Ag-TiO2 catalysts by using a batch reactor with a UV (36 watts) lamp. A series of Ag-TiO2 catalysts (0.25-5%) was synthesized by the wet impregnation method and with a doping content of up to 5.0 wt% Ag at different calcination temperatures (200, 300, 400 and 500°C). The physic-chemical characteristics of the synthesized catalysts were characterized by powder X-ray diffraction (XRD), and Fourier transforms infrared spectroscopy (FT-IR). The photocatalytic activity of Ag-TiO2 was evaluated in the H2O2 photogeneration in an aqueous solution in presence of formic acid under UV light illumination. The concentration of photogenerated H2O2 was estimated iodometrically. The results revealed that the yield of H2O2 photogeneration at optimum reaction conditions (176 ppm) was achieved.