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Membrane Water Treatment Volume 10, Number 3, May 2019 , pages 223-229 DOI: https://doi.org/10.12989/mwt.2019.10.3.223 |
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Photocatalytic degradation of organic compounds by 2-ethylimidazole-treated titania under visible light illumination |
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Jiwon Seo, Junyoung Jeong and Changha Lee
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| Abstract | ||
| Titania modified by 2-ethylimidazole (2-EI) (denoted as 2-EI-TiO2) demonstrated visible light photocatalytic activity for the degradation of organic compounds. 2-EI-TiO2 was a bright brown powder that exhibited similar crystallinity and morphology with the control TiO2. A diffuse reflectance spectrum indicated that 2-EI-TiO2 absorbs visible light of all wavelengths. X-ray photoelectron spectroscopy (XPS) confirmed the cationic state of nitrogen species (e.g. Ti-O-N) on the surface of 2-EI-TiO2. Visible light-illuminated 2-EI-TiO2 degraded 10 M 4-chlorophenol (4-CP) by approximately 85% in 4 h. The photochemical activity of 2-EI-TiO2 was selective in targeting the organic compound. The repeated use of 2-EI-TiO2 decreased the photocatalytic activity for the 4-CP degradation. Experiments using radical scavengers and oxidant probes revealed that the oxidation by photogenerated holes is responsible for the degradation of organic compounds by illuminated 2-EI-TiO2 and the role of •OH is negligible. | ||
| Key Words | ||
| visible light; photocatalysis; titanium dioxide; 2-ethylimidazole; oxidation | ||
| Address | ||
| Jiwon Seo and Changha Lee: School of Chemical and Biological Engineering, Institute of Engineering Research, Seoul National University, Jiwon Seo, Junyoung Jeong: Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea 2School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulju-gun, Ulsan 44919, Republic of Korea | ||