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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 31, Number 10
BKCSDE 31(10)
October 20, 2010

Title	Enhanced Photocatalytic Activity of 3,4,9,10-Perylenetetracarboxylic Diimide Modified Titanium Dioxide Under Visible Light Irradiation
Author	Ji Won Kim*, Hee Sung Kim, Kook Hyun Yu, Akira Fujishima, Young Soon Kim
Keywords	Titanium dioxide, TiO₂, Photocatalyst, Sensitizer, 3,4,9,10-Perylenetetracarboxylic diimide
Abstract	A method to improve the photocatalytic activity of titanium dioxide by modification with a sensitizer and a metal oxide is proposed. To achieve this goal, we used metal oxides as dopants. In particular, CaWO₄ and Gd₂O₂S:Tb were used because their 2.6 eV and 2.2 eV band gap energy and optical properties have a large positive effect on photocatalysis. The improvement in the photocatalytic activity of TiO₂ modified with Gd₂O₂S:Tb under ultraviolet light irradiation is described in a previous study. The present work focuses on the sensitization of metal oxide-modified TiO₂. Having observed the ultraviolet-visible absorption spectra of 3,4,9,10-Perylenetetracarboxylic diimide in the wide visible-light region from 400 nm to 650 nm and the broad peaks in its photoluminescence spectra at 695 nm and 717 nm, we decided to use this perylene dye to sensitize modified TiO₂ to enhance its activity as a visible-light harvesting photocatalyst. We also explored the positive effects thin-film surface changes stemming from ultraviolet pre-treatment have on photocatalytic activity. Finally, we subjected several metal oxide-modified TiO₂ products sensitized by the perylene dye to ultraviolet pre-treatment, obtaining the most active photocatalysts.
Page	2849 - 2853
Full Text	PDF

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