Hierarchical visible-light-response Ag/AgCl@TiO₂ plasmonic photocatalysts for organic dye degradation

A plasmonic photocatalyst of Ag/AgCl@TiO₂ nanoparticles (NPs) was directly prepared by a one-step sonochemical method. Both Ag NPs and AgCl were co-deposited on TiO₂ NPs to form Ag@TiO₂ and Ag/AgCl@TiO₂ using the method. Due to the localized surface plasmonic effects of Ag NPs, the visible-light absorbance of the Ag/AgCl@TiO₂ photocatalyst was dramatically increased and the photocatalytic activity to decompose Rhodamine B was much improved under visible light. In addition, due to the advantages of the sonochemical approach, only a very small amount of Ag is required to obtain a high photocatalytic activity in the plasmonic catalyst. The mechanism for the enhancement of the visible-light-driven photocatalytic activities was also analyzed.