LAUSR

Abstract Hydrogen peroxide was applied during the synthesis to enhance the visible light excitability of nanosized ( 2 -s. As-prepared photocatalysts were characterized by X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), infrared spectroscopy (IR), and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of the catalysts were investigated by phenol, Rhodamine B dye and coumarin degradation under visible light irradiation. Evonik Aeroxide P25 TiO 2 and commercial rutile phase titanium dioxide were used as reference photocatalysts. First order derivative of DRS spectra showed enhanced visible light excitability in the case of Ti:H 2 O 2  = 1:2 ratio (applied during the synthesis). XPS measurements confirmed the formation of peroxo groups in this specific TiO 2 . Photocatalytic measurements pointed out that this TiO 2 had by far the best photocatalytic performance, exceeding the photocatalytic activity of Aeroxide P25 and commercial rutile as well. This activity gain was attributed to the presence of peroxo groups on the surface.