Abstract
In this study, TiO2 microspheres with exposed {001} facets were successfully synthesized by a low-temperature hydrothermal method without using any organic solvents as morphology controlling agent. Furthermore, an active Pt-TiO2 catalyst was prepared by impregnation and deposition-precipitation methods with reduction processes. The photocatalytic activity of the samples was evaluated by degradation of formaldehyde in air under visible light irradiation at room temperature. After modification with Pt, the optical absorption property of the Pt-TiO2 microspheres was extended to visible light range. More importantly, the Pt-TiO2 microspheres exhibited excellent photocatalytic performance for formaldehyde degradation under visible light irradiation, being superior to pure TiO2 microspheres and even Pt-P25. The formation mechanism of the TiO2 microspheres with exposed {001} facets was studied. Moreover, the proper photocatalytic mechanism was also proposed. This work provided new insight into the improvement of photocatalytic activity by special high-energy facet exposing and noble metal depositing.
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