Ag-decorated core-shell Sm2O3@TiO2 nanocomposites with enhanced visible-light photocatalytic performance. (December 2018)

• Record Type: Journal Article
• Authors: Zheng, Xiaogang; Li, Xianfen; Peng, Hao; Wen, Jing
• Is Part Of: Journal of physics and chemistry of solids. Volume 123(2018)
• Page Start: 206
• Page End: 215
• Publication Date: 2018-12
• Subjects: Ag-decorating -- Sm2O3@TiO2 -- Core-shell structure -- Photocatalytic activity; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2018.07.022
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: Ag-decorated core-shell Sm2 O3 @TiO2 (Ag-Sm@TiO2 ) nanocomposites were synthesized for the photocatalytic degradation of rhodamine B (RhB) under visible light irradiation. Compared with core-shell Sm2 O3 @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 Sm2 O3 and TiO2 in Fenton reaction system. The heterojunction consisted metallic Ag 0 nanoparticles, Sm2 O3 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 Ag 0 nanoparticles of 6.0 wt% exhibited the best photocatalytic activity and slightly deactivated after five cycle times. Highlights: Ag-decorated core-shell Sm2 O3 @TiO2 was prepared via photodeposition route. 6-Ag-Sm@TiO2 presented the excellent photocatalytic activity and stability. Heterojunction interface facilitated the separation of electron-hole pairs.