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

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

催化学报 ›› 2013, Vol. 34 ›› Issue (8): 1527-1533.DOI: 10.1016/S1872-2067(12)60611-1

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

Ze-Da Meng, Lei Zhu, Kefayat Ullah, Shu Ye, Qian Sun, Won-Chun Oh

Department of Advanced Materials Science and Engineering, Hanseo University, Chungnam 356-706, Korea

收稿日期:2013-03-30 修回日期:2013-05-02 出版日期:2013-08-16 发布日期:2013-07-30
通讯作者: Won-Chun Oh
基金资助:
This work was supported by Research Foundation from Hanseo University in 2012. The authors are grateful to the staff at the University for the financial support.

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

Ze-Da Meng, Lei Zhu, Kefayat Ullah, Shu Ye, Qian Sun, Won-Chun Oh

Department of Advanced Materials Science and Engineering, Hanseo University, Chungnam 356-706, Korea

Received:2013-03-30 Revised:2013-05-02 Online:2013-08-16 Published:2013-07-30
Supported by:
This work was supported by Research Foundation from Hanseo University in 2012. The authors are grateful to the staff at the University for the financial support.

摘要/Abstract

摘要： 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.

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

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]. 催化学报, 2013, 34(8): 1527-1533.

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

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

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