Preparation, characterization and visible-light photocatalytic activity of AgI/AgCl/TiO2

► AgI/AgCl/TiO2 was prepared successfully by a simple ion exchange method. ► AgI/AgCl/TiO2 displays much higher photocatalytic activity than AgCl/TiO2 and AgI/TiO2. ► O2− radicals and H2O2 were proven to be the main active species.