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Title: The enhancement of photodegradation efficiency using Pt-TiO₂catalyst
Authors: Li, Fang-bai
Li, Xiang-zhong
Subjects: Titanium dioxide
Photoluminescence spectroscopy
Methylene blue
Methyl orange
Issue Date: Sep-2002
Publisher: Pergamon (Elsevier)
Source: Chemosphere, Sept. 2002, v. 48, no. 10, p. 1103-1111.
Abstract: This study investigates the mechanism of photosensitization and the recombination of excited electron–hole pairs affected by depositing platinum (Pt) on the surface of titanium dioxide (TiO₂). A new catalyst of Pt–TiO₂was prepared by a photoreduction process. Being model reactions, the photocatalytic oxidation of methylene blue (MB) and methyl orange (MO) in aqueous solutions using the Pt–TiO₂catalyst was carried out under either UV or visible light irradiation. The experimental results indicate that an optimal content of 0.75%Pt–TiO₂achieves the best photocatalytic performance of MB and MO degradation and that the Pt–TiO₂catalyst can be sensitized by visible light. The interaction of Pt and TiO₂was investigated by means of UV–Vis absorption spectra, photoluminescence emission spectra, and X-ray photoelectron emission spectroscopy. The Pt⁰, Pt²⁺ and Pt⁴⁺species existing on the surface of Pt–TiO₂, and the Ti³⁺ species existing in its lattice may form a defect energy level. The Pt impurities, including Pt, Pt(OH)₂, and PtO₂, and the defect energy level absorb visible light more efficiently in comparison with the pure TiO₂and hinder the recombination rate of excited electron–hole pairs.
Rights: Chemosphere © 2002 Elsevier Science Ltd. The journal web site is located at
Type: Journal/Magazine Article
DOI: 10.1016/S0045-6535(02)00201-1
ISSN: 0045-6535
Appears in Collections:CEE Journal/Magazine Articles

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