Cu-Supported TiO<sub>2 </sub>with High Visible-Light Photocatalytic Activity Prepared Using Cupric Acetate

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Author(s)

    • Nakano Takuma
    • Department of Electrical Engineering, Faculty of Science & Technology, Tokyo University of Science
    • Kogoshi Sumio
    • Department of Electrical Engineering, Faculty of Science & Technology, Tokyo University of Science
    • Katayama Noboru
    • Department of Electrical Engineering, Faculty of Science & Technology, Tokyo University of Science

Abstract

TiO<sub>2</sub> photocatalysts can remove harmful substances such as volatile organic compounds (VOCs) under light irradiation. However, they are only activated by ultraviolet light at wavelengths shorter than about 380 nm, so they cannot be used under visible light irradiation. Thus, visible-light-responsive photocatalysts have been studied extensively to enable their indoor use. TiO<sub>2</sub> powder supported with Cu(II) ions (Cu(II)/TiO<sub>2</sub>) has recently been reported to possess visible-light photocatalytic activity. In the present study, we used cupric acetate as a Cu(II) source. We prepared various Cu(II)/TiO<sub>2</sub> photocatalysts by changing the amount of cupric acetate and assessed their photocatalytic performance. The performance of Cu(II)/TiO<sub>2</sub> photocatalysts was estimated from the rate of decrease in the formaldehyde (HCHO) concentration in the flowing stimulant air under irradiation by a fluorescent lamp or a white LED. The surface properties of Cu(II)/TiO<sub>2</sub> photocatalysts were analyzed by X-ray photoelectron spectroscopy (XPS) measurements. The optical reflectance of Cu(II)/TiO<sub>2</sub> photocatalysts was measured by using a UV-Vis spectrophotometer. The maximum visible-light photocatalytic activity was observed at a Cu/TiO<sub>2</sub> weight ratio of 5.69 [wt%]. The maximum rate of decrease in the HCHO concentration of the Cu(II)/TiO<sub>2</sub> photocatalyst was higher than twice that of a typical commercial TiO<sub>2</sub>-based visible-light-responsive photocatalyst (Ishihara-Sangyo MPT-623) under the same test conditions. [DOI: 10.1380/ejssnt.2015.143]

Journal

  • e-Journal of Surface Science and Nanotechnology

    e-Journal of Surface Science and Nanotechnology 13(0), 143-146, 2015

    The Surface Science Society of Japan

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