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

Koh, Pei Wen and Yuliati, Leny and Lee, Siew Ling (2014) Effect of transition metal oxide doping (Cr, Co, V) in the photocatalytic activity of TiO2 for congo red degradation under visible light. Jurnal Teknologi (Sciences and Engineering), 69 (5). pp. 45-50. ISSN 0127-9696

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Official URL: https://dx.doi.org/10.11113/jt.v69.3203

Abstract

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

Item Type:Article
Uncontrolled Keywords:titania, transition metal oxide, congo red, photodegradation
Subjects:Q Science
Divisions:Science
ID Code:52579
Deposited By: Siti Nor Hashidah Zakaria
Deposited On:01 Feb 2016 11:52
Last Modified:19 Sep 2018 13:09

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