The TiO2|Pt photocatalyst was prepared by solution-processed platinization of P25 TiO2 nanoparticles (Evonik, anatase/rutile, 21 nm) as discussed in previous reports. Briefly, 150 mg of TiO2 was dispersed in 10 mL of MilliQ ® water through bath sonication for 30 min. Thereafter, 0.29 g of trisodium citrate dihydrate was added to the dispersion followed by sonication for another 30 min. 42 µL of H2PtCl6 solution (8% in water) was then added to the mixture. After sonication for further 20 min, freshly prepared NaBH4 solution (5 mg dissolved in 1 mL of MilliQ ® water) was added to the solution drop-wise under stirring. After stirring for 30 min, the TiO2|Pt photocatalyst was isolated using centrifugation, washed with water and dried at 80 ºC overnight under air.