Au/TiO₂/Graphene Composite with Enhanced Photocatalytic Activity Under Both UV and Visible Light Irradiation

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• 作者：Xiaoyu Li ; Fei Chen ; Chengjiang Lian ; Shizheng Zheng…
• 关键词：Au nanoparticles ; Graphene ; TiO2 ; Photocatalysis ; Methylene blue
• 刊名：Journal of Cluster Science
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：27
• 期：6
• 页码：1877-1892
• 全文大小：1,257 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Catalysis
  Inorganic Chemistry
  Physical Chemistry
  
• 出版者：Springer Netherlands
• ISSN：1572-8862
• 卷排序：27

文摘

Au/TiO₂/graphene composite was synthesized by the combination of electrostatic attraction and photo-reduction method. In the composite, graphene sheets act as an adsorption site for dye molecules to provide a high concentration of dye near to the TiO₂ and Au nanoparticles (NPs), and work as an excellent electron transporter to separate photoinduced e−/h+ pairs. Under UV irradiation, photogenerated electrons of TiO₂ are transferred effectively to Au NPs and graphene sheets, respectively, retarding the recombination of electron–hole pairs. Under visible light irradiation, the Au NPs are photo-excited due to the surface plasmon resonance effect, and charge separation is accomplished by the interfacial electron injection from the Au NPs to the conduction band of TiO₂ and then transfer further to graphene sheets. As a result, compared with pure TiO₂, Au/TiO₂/graphene composite exhibited much higher photocatalytic activity for degradation of methylene blue under both UV and visible light irradiation, based on the synergistic effect of Au, graphene in contact with TiO₂, allowing response to the visible light, effective separation of photoinduced charges, and better adsorption of the dye molecules.