Abstract
Ag-decorated core-shell Sm2O3@TiO2 (Ag-Sm@TiO2) nanocomposites were synthesized for the photocatalytic degradation of rhodamine B (RhB) under visible light irradiation. Compared with core-shell Sm2O3@TiO2 nanoparticles, the enhanced photocatalytic activity of Ag-Sm@TiO2 under visible light region was attributed to the surface plasmonic resonance effect of metallic silver and the interface effect between Sm2O3 and TiO2 in Fenton reaction system. The heterojunction consisted metallic Ag0 nanoparticles, Sm2O3 core, and TiO2 shell was suitable for the separation of photoexcited electron-hole pairs and the suppression of charge carriers recombination. In addition, the •OH radical was the key active radicals for the photocatalytic degradation of RhB in visible light region. Removal efficiency of RhB over Ag-Sm@TiO2 increased and then decreased with the increasing Ag amount, of which the 6-Ag-Sm@TiO2 with metallic Ag0 nanoparticles of 6.0 wt% exhibited the best photocatalytic activity and slightly deactivated after five cycle times.
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