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    Please use this identifier to cite or link to this item: http://ir.cnu.edu.tw/handle/310902800/27861


    標題: In situ Sn2+-incorporation synthesis of titanate nanotubes for photocatalytic dye degradation under visible light illumination
    作者: Tsai, Chien-Cheng
    Chen, Liang-Che
    Yeh, Te-Fu
    Teng, Hsisheng
    貢獻者: 環境工程與科學系
    關鍵字: Divalent Sn Ion
    Photocatalysis
    Titanate Nanotubes
    Visible Light
    日期: 2013-01
    上傳時間: 2014-05-26 10:46:39 (UTC+8)
    出版者: Elsevier Science Sa
    摘要: Sn2+-incorporated titanate nanotubes, prepared by washing a layered sodium titanate with a SnCl2 solution for tube formation, exhibit noticeable photocatalytic activity under visible light irradiation. This in situ synthesis results in a Sn/Ti ratio of approximately 0.6. Because of the introduction of Sn2+ ions, the Sn 5s orbital replaces the O 2p orbital as the top level of the valence band of titanate nanotubes. Optical absorption analysis shows that Sn doping reduces the bandgap of titanate nanotubes from 3.5 to 2.6 eV. Oxidation of the Sn2+-incorporated titanate nanotubes leads to oxidation of Sn2+ to Sn4+, hence, widening the bandgap. Under visible light irradiation, Sn2+-incorporated titanate nanotubes effectively degrade methylene blue in an aqueous solution, whereas the bare titanate nanotubes exhibit substantially lower photocatalytic activity. Photoluminescence analysis demonstrates that the induced charges from excitation of the Sn2+ ions tend to be relaxed through chemical interactions, rather than irradiative recombination. (C) 2012 Elsevier B.V. All rights reserved.
    Appears in Collections:[環境工程與科學系(所)] 期刊論文

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