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Photocatalytic degradation of phenol on different phases of TiO₂ particles in aqueous suspensions under UV irradiation
- Lin, Su-Hsia, Chiou, Chwei-Huann, Chang, Chih-Kai, Juang, Ruey-Shin
- Journal of environmental management 2011 v.92 no.12 pp. 3098-3104
- models, pH, phenol, photolysis, physical activity, temperature, titanium dioxide, ultraviolet radiation
- Photocatalytic degradation of phenol on different phases of TiO₂ particles was examined under 400-W UV irradiation. The effects of various operating parameters including TiO₂ dosage, solution pH (4–10), and initial phenol concentration (0.13–1.05 mM) on phenol degradation were investigated. Three forms of TiO₂ photocatalysts such as pure anatase phase, pure rutile phase, and the mixed phase were prepared by sol-gel method and followed annealing at different temperatures. The annealing temperature used were 500 °C, 700 °C and 900 °C for pure anatase phase, the mixed phase, and pure rutile phase, respectively. It was shown that pure anatase TiO₂ exhibited higher photocatalytic activity than the physical mixture of pure anatase and rutile TiO₂. Moreover, the TiO₂ particle with a specific fraction of mixed anatase and rutile phases exhibited better performance than pure anatase TiO₂. Finally, the degradation rate could be satisfactorily fitted by a pseudo-first-order kinetic model.