Visible light activated mesoporous TiO2-xNx nanocrystalline photocatalyst

Jiang, Zheng, Al-Shahrani, Farhan, Lin, Tsung-Wu, Cui, Yingying and Xiao, Tiancun (2007) Visible light activated mesoporous TiO2-xNx nanocrystalline photocatalyst. Zhao, Dongyuan, Qiu, Shilun, Yang, Yi and Yu, Chengzhong (eds.) In Recent Progress in Mesostructured Materials. Studies in Surface Science and Catalysis: Proceedings of the 5th International Mesostructured Materials Symposium (IMMS2006). Elsevier. pp. 355-359 . (doi:10.1016/S0167-2991(07)80334-X).

Abstract

Mesoporous TiO2-xNx has been prepared using template-free solvothermal synthesis with post-ammonolysis at 500°C. The characterizations using X-ray diffraction (XRD), Raman, X-ray photoelectron spectroscopy (XPS), N2 ad-desorption, and transmission electron microscopy (TEM) showed that the TiO2-xNx is typical mesopores anatase nanocrystalline. The nitrogen dopant causes the absorption edge of TiO2 shift to a lower energy region that enhances its visible light absorption. Under visible light irradiation, the TiO2-xNx exhibits higher activity than commercial P25 but similar activity in decoloration of methylene blue under UV irradiation. There have been great interests in porous titania for its potential application in photocatalysis, sensor, and photovoltaics. Different synthesis strategies to produce mesoporous titania has been developed using a variety of surfactant templates. The combination of the template-free solvothermal synthesis of TiO2-ST and post-ammonolysized TiO2-xNx-ST is an effective method for preparing mesoporous N-doped TiO2. The mesopores of TiO2-xNx-ST result from the aggregation of their nano-crystalline particles. The crystal anatase phase of TiO2-xNx-ST is an important feature for photocatalysis. The TiO2-xNx-ST can adsorb the visible light up to 550 nm, therefore, exhibits higher visible light activity.

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Contributors

Author: Zheng Jiang

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