Characterization of Co 2+ - and Fe 3+ -Codoped TiO 2 Nanomaterials for Photocatalytic Degradation of Organic Pollutants under Visible Light Irradiation

• Published in: Adsorption science & technology 2021-01, Vol.2021
• Main Authors: Mai, Nguyen Thi Tuyet, Nga, Nguyen Kim, Hue, Dang Thi Minh, Dung, Ta Ngoc, Chinh, Huynh Dang, Huy, Tran Quang
• Format: Article
• Language: English
• ISSN: 0263-6174; 2048-4038
• DOI: 10.1155/2021/9193052

In this study, TiO 2 nanomaterials were prepared using a solvothermal method and codoped with Co 2+ and Fe 3+ ions for the photocatalytic degradation of organic pollutants under visible light. The physicochemical properties of the obtained materials were studied by powder X-ray diffraction, field emission electron scanning microscopy, energy-dispersive X-ray spectroscopy, and nitrogen adsorption isotherms. Optical absorption was characterized by UV-vis absorption spectroscopy. The photocatalytic activities of the prepared materials were evaluated through methylene blue (MB) degradation under visible light irradiation. Results showed the excellent performance of MB degradation investigated on TiO 2 samples codoped with Co 2+ and Fe 3+ in comparison with undoped and Co 2+ -doped TiO 2 samples. The codoped TiO 2 samples degraded 85%–90% of MB after 120 min, whereas all the prepared TiO 2 samples were composed of pure anatase phase and had a spherical-like shape and mean crystalline size ranging from 6.2 nm to 7.8 determined by Scherrer’s equation. The optical absorption of the TiO 2 codoped with Co 2+ and Fe 3+ was significantly enhanced toward the visible light region. The pseudo-second-order kinetic model fits well for the degradation of MB on as-prepared TiO 2 codoped with Co 2+ and Fe 3+ .