Iodine-Doped TiO2 Photocatalysts: Correlation between Band Structure and Mechanism

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The Institute of Scientific and Industrial Research (SANKEN), Osaka University,Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan
* Corresponding author. Telephone: +81-6-6879-8495. Fax: +81-6-6879-8499. E-mail: [email protected]
Cite this: J. Phys. Chem. C 2008, 112, 38, 14948–14954
Publication Date (Web):August 30, 2008
https://doi.org/10.1021/jp804985f
Copyright © 2008 American Chemical Society
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Abstract

Iodine-doped TiO2 powders (I-TiO2) prepared via hydrothermal treatment have absorption in the region of ultraviolet (UV) and visible light, and were used as a photocatalyst with irradiation of UV or visible light. The I-TiO2 powders were characterized by XRD, TEM, EDS, XPS, FTIR, and steady-state UV−vis diffuse reflectance spectra (DRS), and their photocatalytic activities were investigated based on the photodegradation of 4-chlorophenol (4-CP) in water. A higher photodegradation efficiency of 4-CP was observed for I-TiO2 under UV- and visible-light irradiation, when compared to the undoped TiO2. The transient behavior of the photogenerated charge carriers, such as trapped electrons (e) and holes (h+), and the one-electron oxidation dynamics of substrates during UV or visible laser flash photolysis of undoped TiO2 and I-TiO2 powders were investigated using time-resolved diffuse reflectance (TDR) spectroscopy. The time evolution of transient signals indicated that the long-lived photogenerated h+ were formed upon the laser excitation of I-TiO2 powders, while no trapped e were observed. From the experimental results, it is suggested that the recombination of e−h+ pairs is inhibited because the doping I sites act as trapping site to capture the e during the I-TiO2 photocaltalytic reaction. Furthermore, the trapped h+ generated in I-TiO2 have no significant oxidation reactivity toward substrates, such as aliphatic and aromatic compounds, adsorbed on the surface under both UV- and visible-light irradiation.

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