Enhanced visible light photocatalytic activity of Ag2S-graphene/TiO2 nanocomposites made by sonochemical synthesis

doi:10.1016/S1872-2067(12)60611-1

Abstract

Abstract: Ag₂S-graphene/TiO₂ composites were synthesized by a facile sonochemical method. The products were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, and UV-Vis diffuse reflectance spectrophotometry. During the synthesis reaction, the reduction of graphene oxide and loading of Ag₂S and TiO₂ particles were achieved. The Ag₂S-graphene/TiO₂ composites possessed a large adsorption capacity for dyes, an extended light absorption range, and efficient charge separation properties. Hence, in the photodegradation of rhodamine B, a significant enhancement in the reaction rate was observed with the Ag₂S-graphene/TiO₂composites as compared to pure TiO₂. The generation of reactive oxygen species was detected by the oxidation of 1,5-diphenyl carbazide to 1,5-diphenyl carbazone. The high activity was attributed to the synergetic effects of high charge mobility and the red shift in the absorption edge of the Ag₂S-graphene/TiO₂ composites.

Key words: Silver sulfide, Graphene, Titanium dioxide, UV-Vis absorption spectroscopy, Visible light, Rhodamine B

Ze-Da Meng, Lei Zhu, Kefayat Ullah, Shu Ye, Qian Sun, Won-Chun Oh. Enhanced visible light photocatalytic activity of Ag₂S-graphene/TiO₂ nanocomposites made by sonochemical synthesis[J]. Chinese Journal of Catalysis, 2013, 34(8): 1527-1533.

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Enhanced visible light photocatalytic activity of Ag₂S-graphene/TiO₂ nanocomposites made by sonochemical synthesis

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