Synthesis and characterization of Cu/N-doped mesoporous TiO2 visible light photocatalysts

Authors: Chan-Soo Kim, Jung-Woo Shin, Young-Hyuck Cho, Hee-Dong Jang, Hong-Sik Byun, Tae-Oh Kim

Abstract:
Visible-light-responsive Cu/N-doped mesoporous TiO₂ photocatalysts were synthesized by a templatefree homogenous coprecipitation method that was followed by an impregnation method. The photocatalysts were characterized by X-ray diffraction (XRD) analysis, field-emission scanning electron microscope (FE-SEM), X-ray photoelectron spectroscopy (XPS), the Brunauer–Emmett–Teller (BET) and Barrett–Joyner–Halenda (BJH) methods, and ultraviolet–visible spectrophotometry. The Cu/N-doped TiO₂ photocatalysts had a well-defined mesoporous structure and large specific area and were responsive to visible light. On increasing the amount of Cu loaded, absorption in the visible-light range increased significantly, while the specific surface area and pore volume decreased. The photocatalytic activities were evaluated via the photodegradation of gaseous xylene under UV- and visible-light irradiation. The photocatalytic activity of Cu/N-doped mesoporous TiO₂ was considerably greater than that of both the sample undoped with Cu as well as that of commercially available TiO₂ (Degussa P25), which has low Cu content. Doping with nitrogen and Cu resulted in highly effective mesoporous TiO₂ photocatalysts that were responsive to visible light.

Keywords:
Cu/N-doped mesoporous TiO₂
Visible-light response
Surface area

Published in: Applied catalysis A: General  (Volume 455, Pages 1-266, 30 March 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

Synthesis and characterization of Cu/N-doped mesoporous TiO2 visible light photocatalysts

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