The photocatalytic activity was also evaluated on the basis of nitrobenzene reduction in 2-propanol (Scheme 1). For this, 1.7 mL of 10 mM nitrobenzene (Acros Organics) in 2-propanol (VWR) was reduced to aniline in the test reactor. The COP platelets (1.5 x 1.5 cm 2 ), coated on one side, were irradiated from the back side with a high-power UVA-LED lamp (LEDMOD365.1050.V2, Omicron, Germany, λmax = 365 nm, 450 mW radiant power) with the coated front side facing the solution. An illustration is shown in Fig. . The aniline formation rate (kB) and the degradation constants of nitrobenzene (kD) represent the initial pseudo-zero order reaction and were determined using linear regression of the concentration-time profiles.