
303Biomass Transformations Using Photocatalytic Nanomaterials
Among all photocatalytic systems tested, the best product selectivity was achieved
with titania synthesized by the ultrasound-modied sol–gel method (TiO
2
(US))
[144]. Colmenares et al. also observed that solvent composition and short illumi-
nation times have a considerable effect on photocatalysts activity/selectivity. The
total organic compounds selectivity of 39.3% and 71.3% for 10% water/90% aceto-
nitrile and 50% water/50% acetonitrile used as solvents, respectively, toward organic
compounds in liquid phase was obtained with TiO
2
(US). Such results suggest that
synthesized nano