Abstract
Three polymorphs of Ga 2O 3 ( α-, β-, and γ-Ga 2O 3) were prepared, and their photocatalytic activities were evaluated by the decomposition of volatile aromatic compounds (e.g., benzene, toluene, and ethylbenzene) in dry air stream under UV light illumination at room temperature. It was found that the Ga 2O 3 catalysts exhibited much higher photocatalytic activity than commercial TiO 2. The photocatalytic activities of the Ga 2O 3 polymorphs were strongly influenced by their crystal structure, and their specific activities decreased in the following order: β-Ga 2O 3 > α-Ga 2O 3 > γ-Ga 2O 3. The reasons for the differences in photocatalytic activity of the Ga 2O 3 polymorphs are discussed in terms of crystallinity, geometric structure, and electronic properties of the polymorphs.
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