Synthesis of Cu2PO4OH Hierarchical Superstructures with Photocatalytic Activity in Visible Light

Authors

  • In-Sun Cho,

    1. Department of Materials Science and Engineering, College of Engineering, Seoul National University, Shillim-dong San 56-1, Gwanak-gu, Seoul 151-744 (South Korea)
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  • Dong Wook Kim,

    1. Department of Materials Science and Engineering, College of Engineering, Seoul National University, Shillim-dong San 56-1, Gwanak-gu, Seoul 151-744 (South Korea)
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  • Sangwook Lee,

    1. Department of Materials Science and Engineering, College of Engineering, Seoul National University, Shillim-dong San 56-1, Gwanak-gu, Seoul 151-744 (South Korea)
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  • Chae Hyun Kwak,

    1. Department of Materials Science and Engineering, College of Engineering, Seoul National University, Shillim-dong San 56-1, Gwanak-gu, Seoul 151-744 (South Korea)
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  • Shin-Tae Bae,

    1. Department of Materials Science and Engineering, College of Engineering, Seoul National University, Shillim-dong San 56-1, Gwanak-gu, Seoul 151-744 (South Korea)
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  • Jun Hong Noh,

    1. Department of Materials Science and Engineering, College of Engineering, Seoul National University, Shillim-dong San 56-1, Gwanak-gu, Seoul 151-744 (South Korea)
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  • Sung Hun Yoon,

    1. Department of Materials Science and Engineering, College of Engineering, Seoul National University, Shillim-dong San 56-1, Gwanak-gu, Seoul 151-744 (South Korea)
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  • Hyun Suk Jung,

    1. School of Advanced Materials Engineering, Kookmin University, Jeongneung-dong, Seongbuk-gu, Seoul 136-702 (South Korea)
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  • Dong-Wan Kim,

    1. Nano-Science Research Division, Korea Institute of Science and Technology Seoul 136-791 (South Korea)
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  • Kug Sun Hong

    Corresponding author
    1. Department of Materials Science and Engineering, College of Engineering, Seoul National University, Shillim-dong San 56-1, Gwanak-gu, Seoul 151-744 (South Korea)
    • Department of Materials Science and Engineering, College of Engineering, Seoul National University, Shillim-dong San 56-1, Gwanak-gu, Seoul 151-744 (South Korea).
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  • This work was supported by the Korea Science and Engineering Foundation (KOSEF) grant funded by the Korea government (MOST) (R01-2007-000-11075-0).

Abstract

Using a wet-chemical method and without any surfactants or templates, various 3D hierarchical superstructures of Cu2PO4OH were synthesized by simply adjusting the pH. The resulting hierarchical superstructures were characterized using X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), high resolution-TEM (HRTEM), Fourier transform infrared spectroscopy (FTIR), Raman, and UV–Vis spectroscopy. With an increase in pH from 2.5 to 7.0, the morphology of Cu2PO4OH varied from microrods to walnut-shaped microspheres of self-assembled nanoparticles. A possible mechanism for the formation of the Cu2PO4OH hierarchical superstructures was also proposed. The optical properties of the Cu2PO4OH hierarchical superstructures were strongly related to their morphologies and the size of the assembled crystallites. We further demonstrated the useful photocatalytic activity of these complex structures in the degradation of methylene blue (MB) dye under visible light irradiation (λ > 410 nm). The best photocatalytic performance was achieved by Cu2PO4OH with a walnut-shaped morphology due to the excellent absorption of visible light as well as a high BET surface area.

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