Improving the visible light photocatalytic activity of mesoporous TiO₂ via the synergetic effects of B doping and Ag loading

详细信息    查看全文

• 作者：Baozhu Tian ; Zhimang Shao ; Yunfei Ma ; Jinlong Zhang  ; ;   ; ^{jlzhang@ecust.edu.cn} ; Feng Chen
• 关键词：A. Oxides ; A. Nanostructures ; B. Chemical synthesis ; C. X-ray diffraction ; D. Microstructure
• 刊名：Journal of Physics and Chemistry of Solids
• 出版年：2011
• 出版时间：November 2011
• 年：2011
• 卷：72
• 期：11
• 页码：1290-1295
• 全文大小：567 K

文摘

B-doped together with Ag-loaded mesoporous TiO₂ (Ag/B¨CTiO₂) was prepared by a two-step hydrothermal method in the presence of boric acid, triblock copolymer surfactant, and silver nitrate, followed by heat treatment. The obtained samples were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), UV¨Cvis diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy (XPS), and nitrogen adsorption¨Cdesorption. It was revealed that all samples consist of highly crystalline anatase with mesoporous structure. For Ag/B¨CTiO₂, B was doped into TiO₂ matrix in the form of both interstitial B and substitutional B while Ag was deposited on the surface of B¨CTiO₂ in the form of metallic silver. Compared with the single B-doped or Ag-loaded TiO₂ one, mesoporous Ag/B¨CTiO₂ exhibits much higher visible light photocatalytic activity for the degradation of Rhodamine 6G, which can be ascribed to the synergistic effects of B doping and Ag loading by narrowing the band gap of the photocatalyst and preventing the fast recombination of the photogenerated charge carriers, respectively.