Remember that the MnOx amount in our samples is very low (Table 1) and that the XRD reflections intensities depend on the crystallinity of the sample which is rather low in Mn3O4/TiO2 explaining why their XRD reflections are not observed. The BET surface areas of TiO2 and MnOx/TiO2 samples are presented on Table 1. All obtained values are around 52 m2 g-1 andobserved differences are within the experimental error. Since the amount of MnOx is verylow its contribution to the surface area is negligible.