Improved visible-light photocatalytic activity of TiO 2 co-doped with copper and iodine

Dorraj, Masoumeh and Goh, Boon Tong and Sairi, Nor Asrina and Woi, Pei Meng and Basirun, Wan Jefrey (2018) Improved visible-light photocatalytic activity of TiO 2 co-doped with copper and iodine. Applied Surface Science, 439. pp. 999-1009. ISSN 0169-4332

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Official URL: https://doi.org/10.1016/j.apsusc.2017.12.248

Abstract

Cu-I-co-doped TiO 2 photocatalysts active to visible light absorption were prepared by hydrothermal method and calcined at various temperatures (350 °C, 450 °C, and 550 °C). The co-doped powders at 350 °C displayed the highest experimental Brunauer–Emmett–Teller surface area and lowest photoluminescence intensity, which demonstrated that a decrease in electron–hole recombination process. The synthesis of co-doped TiO 2 was performed at this optimized temperature. In the co-doped sample, the Cu 2+ doped TiO 2 lattice created a major “red-shift” in the absorption edge due to the presence of the 3d Cu states, whereas the amount of red-shift from the I 5+ doping in the TiO 2 lattice was minor. Interestingly, the presence of Cu 2+ species also boosted the reduction of I 5+ ions to the lower multi-valance state I − in the TiO 2 lattice by trapping the photogenerated electrons, which resulted in effective separation of the photogenerated charges. The Cu-I-co-doped TiO 2 was able to degrade methyl orange dye under visible-light irradiation with improved photocatalytic activity compared with the single metal-doped TiO 2 and pure TiO 2 because of the strong visible light absorption and effective separation of photogenerated charges caused by the synergistic effects of Cu and I co-dopants.

Item Type: Article
Uncontrolled Keywords: Codoped TiO2; Photocatalytic degradation; Visible light absorption; Methyl orange
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Faculty of Science > Dept of Chemistry
Faculty of Science > Dept of Physics
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 30 Aug 2019 02:21
Last Modified: 30 Aug 2019 02:21
URI: http://eprints.um.edu.my/id/eprint/22131

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