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%.
- Titania,
- Silver-modified,
- Solvothermal method,
- Sol-gel method,
- Methylene blue,
- Photocatalysis
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Solvothermal Preparation of Ag/TiO2 Nanoparticles and Their Photocatalytic Activity

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通讯作者: 陈斌, bchen63@163.com

Solvothermal Preparation of Ag/TiO₂ Nanoparticles and Their Photocatalytic Activity