Figure displays the relative concentration of EPR spectra (presented as the area of EPR signals) of MV •+ radical cation generated upon LED@365 nm exposure in the dimethylsulfoxide (DMSO) dispersion under an inert atmosphere. The highest signal was detected in Ti/450. However, the generation of MV •+ radical cation in the reacting system with CuxO and CuxO-graphene modified titania-based materials was significantly lower.