Anchoring a uniform TiO₂ layer on graphene oxide sheets as an efficient visible light photocatalyst

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• 作者：Ye Cong ; Mei Long ; Zhengwei Cui ; Xuanke Li ; Zhijun Dong ; Guanming Yuan ; Jiang Zhang
• 关键词：Titanium dioxide ; Uniform layer ; Graphene oxide ; Support ; Photocatalysis
• 刊名：Applied Surface Science
• 出版年：2013
• 出版时间：1 October, 2013
• 年：2013
• 卷：282
• 期：Complete
• 页码：400-407
• 全文大小：2461 K

文摘

TiO₂-graphene oxide (GO) was successfully prepared by a two-step approach including the in situ growth of a uniform TiC layer on graphene oxide sheets and subsequently oxidation conversion of TiC to anatase TiO₂. The as-prepared composites were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Raman spectroscopy and X-ray photoelectron spectroscopy. The photocatalytic activity was evaluated by degradation of methylene blue (MB) under visible light irradiation. The results suggest that TiO₂-GO keep the similar morphology with the pristine GO sheets and the nanosize anatase TiO₂ particles distribute uniformly and densely on the surface of GO sheets. TiO₂ particles contact closely with GO via TiOC bonds. The presence of GO provides a good support substrate and enhances the adsorption capacity and photo-degradation ability of the composite photocatalyst. And by adjusting the molar ratio of GO and titanium powder in the molten salt process, TiO₂-GO nanocomposites with controllable contents of GO and TiO₂, good adsorption capacity and excellent photo-degradation ability can be obtained.