The reduction of nitrobenzene to aniline was also investigated using coated and uncoated WLEs. The 100 mL WLE reactor (Fig. ) was charged with 25 mL of 10 mM nitrobenzene in 2-propanol and 50 of the WLEs as light source (OCU-440 UE365-X-T LED, λmax = 365 nm, OSA Opto Light). In case of uncoated WLEs, particulate TiO2 (2 g L -1 , Evonik Degussa P25) was added as photocatalyst.