The effect of metal ion (Cu2+, Fe3+, Zn2+, and Al3+) on the photocatalytic activity of modified TiO2 was investigated under visible light. Most metal ions had only a slight influence on the photodegradation of dyes except Fe3+. The formation of OH radical during the photodegradation process was detected to examine the role of Fe3+. In contrast to a commercial aqueous TiO2 dispersion, Fe3+ accelerated the photodegradation of dyes in aqueous modified TiO2 dispersions under visible light. The contrary effect was ascribed to the complexation of the hydroxyl groups bound to TiO2 surface with Fe3+ to form Fe(OH)2+. The dye can excited electron to Fe(OH)2+ under visible light and release additional hydroxyl radical to increase photodegradation. These results demonstrate that an excess amount of hydroxyl groups on modified TiO2 surface play a key role in determining the electron-transfer pathway of the dye-sensitized photocatalysis under visible light irradiation.

Effect of ferric ions on the formation of hydroxyl radical from modified TiO<sub>2</sub> photocatalyst under visible light

246th National Meeting (2013)

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Effect of ferric ions on the formation of hydroxyl radical from modified TiO2 photocatalyst under visible light

Effect of ferric ions on the formation of hydroxyl radical from modified TiO₂ photocatalyst under visible light