Recent research trends of the preparation and characterization of highlyefficient titanium oxide–based photocatalysts are reviewed on the basis of studies donein our laboratory. Special attention is focused on the preparation and characterizationof active sites of highly dispersed titanium oxide species within mesoporous matricesand on titanium oxide–based binary catalysts such as Ti/Si and Ti/B oxides andunique visible light-responsive second-generation TiO2 photocatalysts prepared by anadvanced metal-ion-implantation and RF magnetron sputtering deposition method.Highly dispersed titanium oxide species within mesoporous frameworks and titaniumoxide–based binary catalysts exhibit high and unique photocatalytic activities for variousreactions, such as the direct decomposition of NOx. These species also have photoinducedsuperhydrophiric properties. It is of significance that visible light-responsiveTiO2 photocatalysts can be applied to the decomposition of NOx in air and the degradationof pollutants in water, as well as to the splitting of water under UV and visiblelight irradiation.
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