Photocatalytic H2 production from methanol aqueous solution over titania nanoparticles with mesostructures

The photocatalytic hydrogen production over TiO2TiO2 nanoparticles with mesostructures has been studied using CH3OHCH3OH as a sacrificial reagent. The effects of the calcination temperature, Pt-loading, amount of TiO2TiO2 and methanol as well as irradiation time on the H2H2 evolution rate were investigated in detail. The results indicated that the as-synthesized TiO2TiO2 nanoparticles without calcination, having a large specific surface area (438m2/g) and small crystallite size (2.3 nm) dispersed among the amorphous mesoporous domains, exhibited the best photocatalytic activity for H2H2 production compared with the samples calcined at different temperatures and the commercial photocatalyst P25 (Degussa, Germany) under the same photoreaction conditions. The presence of mesostructured TiO2TiO2 nanoparticles with a uniform dispersion of the co-catalyst (Pt) has resulted in an effective, faster charge separation, which, in turn, leads to a higher photocatalytic activity for H2H2 production.