Samples were taken from the reaction in regular intervals. After each sampling, the sample was filtered (Ø 0.02 µm) to remove particulate photocatalyst. The products aniline and acetone were analyzed by GC (Focus GC, Thermo Scientific, column: CP-Chirasil 25 m length, 0.25 µm path length, method: 41 °C to 200 °C with 80 K min -1 , 35 kPa constant pressure). Conversion of nitrobenzene was monitored by GC-FID (Trace GC Ultra, Thermo Scientific, column: CS Chromatography 30 m length, 0.25 µm path length, method: 70 °C for 2 min, 10 K min -1 to 240 °C then 25 K min -1 to 320 °C, 60 kPa constant pressure).