Effect of transition metal oxide doping (Cr, Co, V) in the photocatalytic activity of TiO2 for congo red degradation under visible light

• Main Authors: Koh, Pei Wen, Yuliati, Leny, Lee, Siew Ling
• Format: Article
• Language: English
• Published: Penerbit UTM 2014
• Subjects: Q Science
• Online Access: http://eprints.utm.my/id/eprint/52579/1/PeiWenKoh2014_Effectoftransitionmetal.pdf; http://eprints.utm.my/id/eprint/52579/; https://dx.doi.org/10.11113/jt.v69.3203

Comparative study of Cr, Co or V-doped TiO2 was carried out. The photocatalysts were synthesized via sol-gel method. The results indicated that the dopants of Cr, Co, and V induced anatase to rutile phase transition of TiO2 at different dopant amounts of 1, 4, 2 mol%, respectively. Besides that, the existence of dopant extended the absorption wavelength of TiO2 to visible light region, thus making it a visible-driven photocatalyst. The doped transition metal exhibited different oxidation states on the TiO2 surface. The prepared photocatalysts were tested over photodegradation of Congo Red. Amongst all, Cr-doped TiO2 (3 mol%) was the best photocatalyst attributed to the presence of 45% rutile phase, reduced band gap energy of 2.30 eV and formation of Cr6+, which acted as an electron scavenger to delay the hole-electron recombination