Preparation and photocatalytic activity of a novel（ NH4）2Er5F17/ TiO2 composite visible light photocatalyst
Author(s): SUN ShiMeng, LIU JianJun, ZUO ShengLi, YU YingChun, Faculty of Science, Beijing University of Chemical Technology
Pages: 41-47
Year: 2016 Issue: 2
Journal: Journal of Beijing University of Chemical Technology(Natural Science Edition)
Keyword: TiO2; (NH4)2Er5F17; Rhodamine B; visible light response; photocatalysis;
Abstract: ( NH4)2Er5F17/ TiO2 composite photocatalysts have been synthesized via a one-pot hydrothermal route.The materials exhibited extended absorption in the visible light region due to f electron excitation absorption by the rare earth element Er. The photocatalytic activities were evaluated by degrading Rhodamine B（ Rh B） under visible light illumination and the structures of the composite photocatalysts were characterized by XRD,UV-vis,TEM,EDX-mapping,XPS,and PL techniques. The results indicate that the rare earth-based compound（ NH4）2Er5F17 possesses a hexagonal crystal structure with a crystal size of about 50 nm and can be effectively combined with TiO2. The light response of（ NH4）2Er5F17/TiO2 composite photocatalysts were broadened due to the characteristic absorption peaks of the rare earth Er3 +ion at 522 nm,487 nm,654 nm and 800 nm in the visible light region. The photocatalytic activity evaluation of the composite photocatalysts with different n（ Er） / n（ Ti） ratios showed that the sample with n（ Er） / n（ Ti） = 0. 02 has the highest photocatalytic activity in Rh B degradation because of its uniform dispersion,strong light absorption and low electron-hole recombination rate.
Pages: 41-47
Year: 2016 Issue: 2
Journal: Journal of Beijing University of Chemical Technology(Natural Science Edition)
Keyword: TiO2; (NH4)2Er5F17; Rhodamine B; visible light response; photocatalysis;
Abstract: ( NH4)2Er5F17/ TiO2 composite photocatalysts have been synthesized via a one-pot hydrothermal route.The materials exhibited extended absorption in the visible light region due to f electron excitation absorption by the rare earth element Er. The photocatalytic activities were evaluated by degrading Rhodamine B（ Rh B） under visible light illumination and the structures of the composite photocatalysts were characterized by XRD,UV-vis,TEM,EDX-mapping,XPS,and PL techniques. The results indicate that the rare earth-based compound（ NH4）2Er5F17 possesses a hexagonal crystal structure with a crystal size of about 50 nm and can be effectively combined with TiO2. The light response of（ NH4）2Er5F17/TiO2 composite photocatalysts were broadened due to the characteristic absorption peaks of the rare earth Er3 +ion at 522 nm,487 nm,654 nm and 800 nm in the visible light region. The photocatalytic activity evaluation of the composite photocatalysts with different n（ Er） / n（ Ti） ratios showed that the sample with n（ Er） / n（ Ti） = 0. 02 has the highest photocatalytic activity in Rh B degradation because of its uniform dispersion,strong light absorption and low electron-hole recombination rate.
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