there are different semiconductors than titanium oxide(TiO2) like tungsten oxide(WO3), di-iron trioxide(Fe2O3),Assenical Gallium(GaAs), molybdenum sulfide(MoS2) that having much lower energy band gaps...and higher wavelength
The Features make TiO2 is mostly preferred as photocatalyst are TiO2 resists both photocorrosion and the decomposition reactions, superior charge transport properties, highly positive valence band edge and high reactivity as a photoactivated oxidant .