Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (08): 2261-2266.doi: 10.3866/PKU.WHXB20100815

• CATALYSIS AND SURFACE STRUCTURE • Previous Articles     Next Articles

Solvothermal Preparation of Ag/TiO2 Nanoparticles and Their Photocatalytic Activity

XU Ping-Chang1, LIU Yang1, WEI Jian-Hong1,2, XIONG Rui1, PAN Chun-Xu1, SHI Jing1     

  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:2010-03-08 Revised:2010-04-19 Published:2010-07-23
  • Contact: WEI Jian-Hong E-mail:jhwei@whu.edu.cn
  • Supported by:

    The project was supported by the National Key Basic Research Program of China (973) (2009CB939704), National Natural Science Foundation of China (10974148) and the Open Project Program of Low Dimensional Materials and Application Technology (Xiangtan University), Ministry of Education of China (DWKF0806).

Abstract:

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%.

Key words: Titania, Silver-modified, Solvothermal method, Sol-gel method, Methylene blue, Photocatalysis

MSC2000: 

  • O643