Selectivity in the photocatalytic properties of the composites of TiO2 nanoparticles with B- and N-doped graphenes

► Enhanced photocatalytic activity in TiO2-doped-graphene composites. ► Dyes show selectivity towards boron- and nitrogen-doped graphenes. ► Understanding of selectivity through interactions of dyes with graphene. ► Raman 2D band position of graphenes changes markedly on interacting with dyes. ► Electronic structure of graphene plays a significant role in the photodegradation.