Hydrothermal Synthesis of Porous Ag2S Sensitized TiO2 Catalysts and Their Photocatalytic Activities in the Visible Light Range

doi:10.1016/S1872-2067(10)60296-3

催化学报 ›› 2012, Vol. 33 ›› Issue (2): 254-260.DOI: 10.1016/S1872-2067(10)60296-3

Hydrothermal Synthesis of Porous Ag₂S Sensitized TiO₂ Catalysts and Their Photocatalytic Activities in the Visible Light Range

ZHU Lei, MENG Zeda, TRISHA Ghosh, OH Won-Chun*

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

收稿日期:2011-09-16 修回日期:2011-10-10 出版日期:2012-02-20 发布日期:2015-07-27

Hydrothermal Synthesis of Porous Ag₂S Sensitized TiO₂ Catalysts and Their Photocatalytic Activities in the Visible Light Range

ZHU Lei, MENG Zeda, TRISHA Ghosh, OH Won-Chun*

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

Received:2011-09-16 Revised:2011-10-10 Online:2012-02-20 Published:2015-07-27

摘要/Abstract

摘要： Porous Ag₂S sensitized TiO₂ catalysts were synthesized by the hydrothermal process. The crystallization and porous structure of the Ag₂S/TiO₂ composite photocatalysts were investigated by X-ray diffraction, scanning electron microscopy with energy dispersive X-ray analysis, UV-Vis diffuse reflectance spectroscopy, and N₂ adsorption. The Ag₂S/TiO₂ composites were mainly composed of anatase TiO₂ and acanthite Ag₂S. The absorption edge wavelengths of TiO₂ and the Ag₂S/TiO₂ composite prepared with 3 mmol Na₂S·5H₂O were 400 and 800 nm, respectively, that is, the absorption edge of the composite had a pronounced red shift. The photocatalytic activity under visible light was investigated by the degradation of methylene blue with a UV-Vis spectrophotometer. The photocatalytic activitiesunder visible light of the Ag₂S/TiO₂ photocatalysts were much higher than that of TiO₂.

关键词: silver sulfide, titanium dioxide, visible light, photocatalytic activity, methylene blue

Abstract: Porous Ag₂S sensitized TiO₂ catalysts were synthesized by the hydrothermal process. The crystallization and porous structure of the Ag₂S/TiO₂ composite photocatalysts were investigated by X-ray diffraction, scanning electron microscopy with energy dispersive X-ray analysis, UV-Vis diffuse reflectance spectroscopy, and N₂ adsorption. The Ag₂S/TiO₂ composites were mainly composed of anatase TiO₂ and acanthite Ag₂S. The absorption edge wavelengths of TiO₂ and the Ag₂S/TiO₂ composite prepared with 3 mmol Na₂S·5H₂O were 400 and 800 nm, respectively, that is, the absorption edge of the composite had a pronounced red shift. The photocatalytic activity under visible light was investigated by the degradation of methylene blue with a UV-Vis spectrophotometer. The photocatalytic activitiesunder visible light of the Ag₂S/TiO₂ photocatalysts were much higher than that of TiO₂.

Key words: silver sulfide, titanium dioxide, visible light, photocatalytic activity, methylene blue

ZHU Lei, MENG Zeda, TRISHA Ghosh, OH Won-Chun. Hydrothermal Synthesis of Porous Ag₂S Sensitized TiO₂ Catalysts and Their Photocatalytic Activities in the Visible Light Range[J]. 催化学报, 2012, 33(2): 254-260.

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Hydrothermal Synthesis of Porous Ag₂S Sensitized TiO₂ Catalysts and Their Photocatalytic Activities in the Visible Light Range

Hydrothermal Synthesis of Porous Ag₂S Sensitized TiO₂ Catalysts and Their Photocatalytic Activities in the Visible Light Range

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