Membrane and Water Treatment

  • 제10권3호
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  • Pages.223-229
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  • 2019
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  • 2005-8624(pISSN)
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  • 2092-7037(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

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)
  • 투고 : 2018.10.01
  • 심사 : 2018.12.17
  • 발행 : 2019.05.25
⟨ 이전 논문 다음 논문 ⟩

초록

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.

키워드

과제정보

연구 과제번호 : Human Resources Program in Energy Technology

연구 과제 주관 기관 : Korea Institute of Energy Technology Evaluation and Planning (KETEP), National Research Foundation of Korea (NRF)

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