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http://dx.doi.org/10.12989/mwt.2019.10.3.223

Photocatalytic degradation of organic compounds by 2-ethylimidazole-treated titania under visible light illumination  

Seo, Jiwon (School of Chemical and Biological Engineering, Institute of Engineering Research, Seoul National University)
Jeong, Junyoung (School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST))
Lee, Changha (School of Chemical and Biological Engineering, Institute of Engineering Research, Seoul National University)
Publication Information
Membrane and Water Treatment / v.10, no.3, 2019 , pp. 223-229 More about this Journal
Abstract
Titania modified by 2-ethylimidazole (2-EI) (denoted as $2-EI-TiO_2$) demonstrated visible light photocatalytic activity for the degradation of organic compounds. $2-EI-TiO_2$ was a bright brown powder that exhibited similar crystallinity and morphology with the control $TiO_2$. A diffuse reflectance spectrum indicated that $2-EI-TiO_2$ 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 $2-EI-TiO_2$. Visible light-illuminated $2-EI-TiO_2$ degraded $10{\mu}M$ 4-chlorophenol (4-CP) by approximately 85% in 4 h. The photochemical activity of $2-EI-TiO_2$ was selective in targeting the organic compound. The repeated use of $2-EI-TiO_2$ 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 $2-EI-TiO_2$ and the role of $^{\bullet}OH$ is negligible.
Keywords
visible light; photocatalysis; titanium dioxide; 2-ethylimidazole; oxidation;
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