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Integrating the Z-scheme heterojunction into a novel Ag 2 O@rGO@reduced TiO 2 photocatalyst: Broadened light absorption and accelerated charge separation co-mediated highly efficient UV/visible/NIR light photocatalysis.

A photocatalyst with good electron-transfer property and wide spectrum response is of great interest. Herein, visible/NIR-light-driven Ag2 O nanoparticles (NPs) and UV/visible-responsive reduced TiO2 nanosheets (TiO2-x NSs) anchored onto reduced graphene oxide (rGO) forming Ag2 O@rGO@TiO2-x composites are synthesized in this study. The as-synthesized Ag2 O@rGO@TiO2-x composites exhibit a superior full solar spectrum (UV, visible and NIR) response, showing their potential for effective use of solar energy. Compared to single component (TiO2 NSs and Ag2 O NPs) or binary composites (Ag2 O@TiO2 ), Ag2 O@rGO@TiO2-x ternary composite has exhibited improved photocatalytic activity under UV, visible, NIR and nature sunlight irradiation and excellent photostability. The outstanding photocatalytic performance of Ag2 O@rGO@TiO2-x composites depends on three sides: firstly, synergistic effect among the reduced TiO2 , Ag2 O, and rGO improves the wide spectrum response ability; Secondly, Ag2 O@rGO@TiO2-x builds a Z-scheme structure, which promotes the separation of electron/hole pairs and retains prominent redox ability; Thirdly, the electrons of Ag2 O are transferred to rGO to suppress the photo-corrosion of Ag2 O during the photocatalytic process and the stability of Ag2 O@rGO@TiO2-x composite has been enhanced greatly.

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