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Citation: XU Ping-Chang, LIU Yang, WEI Jian-Hong, XIONG Rui, PAN Chun-Xu, SHI Jing. Solvothermal Preparation of Ag/TiO2 Nanoparticles and Their Photocatalytic Activity[J]. Acta Physico-Chimica Sinica, ;2010, 26(08): 2261-2266. doi: 10.3866/PKU.WHXB20100815 shu

Solvothermal Preparation of Ag/TiO2 Nanoparticles and Their Photocatalytic Activity

  • 1.

    1. Key Laboratory of Artificial Micro-and Nano-Structures, Ministry of Education, School of Physics Science and Technology, Wuhan University, Wuhan 430072, P. R. China;
    2. Key Laboratory of Low Dimensional Materials and Application Technology (Xiangtan University), Ministry of Education, Xiangtan 411105, Hunan Province, P.R. China

  • Received Date: 8 March 2010
    Available Online: 18 June 2010

    Fund Project: 国家重点基础研究发展规划项目(973)(2009CB939704) (973)(2009CB939704) 国家自然科学基金(10974148) (10974148)低维材料与技术教育部重点实验室(湘潭大学)开放基金(DWKF0806)资助 (湘潭大学)开放基金(DWKF0806)

  • Visible-light photoactive Ag/TiO2 catalysts were successfully prepared by a solvothermal method. The samples were characterized by X-ray diffraction (XRD), N2 adsorption-desorption isotherm (BET), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and UV-visible (UV-Vis) spectroscopy. The photodegradation of methylene blue (MB) solution was used to evaluate the photocatalytic activity of the catalyst under UV and visible light irradiation (λ>400 nm). XRD results showed that the TiO2 was in the pure anatase phase. Ag nanoparticles were loaded onto the TiO2 nanoparticle surface and this had little influence on the crystal phase and the particle size of TiO2. The specific surface area of the samples was far higher than that for the samples prepared by the sol-gel method and the sample with Ag molar fraction of 5% had the highest value of 151.44 m2·g-1. The absorption spectrum of the Ag-modified TiO2 increased greatly and the adsorption edge was extended into the visible region. The photodegradation of MB solution followed a pseudo-first-order kinetic expression. The photocatalytic activities of the Ag/TiO2 composites prepared by the solvothermal method were remarkably higher than those prepared by the sol-gel method. Under UV or visible light irradiation, the optimal photoactivity was obtained for the sample with a Ag molar fraction of 5%.

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