멤브레인 (Membrane Journal)

  • 제29권6호
  • /
  • Pages.299-307
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  • 2019
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  • 1226-0088(pISSN)
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  • 2288-7253(eISSN)
한국막학회 (The Membrane Society of Korea)
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전이 금속 산화물을 이용한 가시광선 기반 광촉매 분해

Visible Light-based Photocatalytic Degradation by Transition Metal Oxide

  • Lee, Soomin (Nano Science and Engineering, Integrated Science and Engineering Division, Underwood International College, Yonsei University) ;
  • Park, Yeji (Nano Science and Engineering, Integrated Science and Engineering Division, Underwood International College, Yonsei University) ;
  • Lee, Jae Hun (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Patel, Rajkumar (Energy Environmental Science and Engineering, Integrated Science and Engineering Division, Underwood International College, Yonsei University)
  • 투고 : 2019.11.15
  • 심사 : 2019.12.16
  • 발행 : 2019.12.31
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⟨ 이전 논문 다음 논문 ⟩

초록

광촉매는 물에서 유기 염료를 분해하는 친환경적 기술이다. 산화 텅스텐은 이산화 티타늄에 비해 더 작은 밴드갭을 지니고 있어 광촉매 나노물질로서 활발히 연구되고 있다. 계층적 구조의 합성, 백금 도핑, 나노 복합물 또는 다른 반도체와의 결합 등이 광촉매 분해 효율을 향상시키는 방법들로 연구되고 있다. 이들 방법들은 광 파장의 적색편이를 유도하여 전자 이동, 전자-정공 쌍의 형성과 재결합에 영향을 미친다. 산화 텅스텐의 형태 개질을 통해 앞서 언급한 광촉매 분해 효율을 향상시키는 방법들과 합성에 대해 분석하였으며 금속 산화물과 탄소 복합재를 결합하는 방법이 새로운 물질의 합성이 필요없으며 가장 효율적인 방법으로 조사되었다. 이러한 광촉매 기술은 수처리 분리막기술과 모듈화하여 정수처리 목적으로 사용될 수 있다.

Photocatalysis is an environment friendly technique for degrading organic dyes in water. Tungsten oxide is becoming an active area of research in photocatalysis nanomaterials for having a smaller bandgap than the previously favored titanium dioxide. Synthesis of hierarchical structures, doping platinum (Pt), coupling with nanocomposites or other semiconductors are investigated as valid methods of improving the photocatalytic degradation efficiency. These impact the reaction by creating a redshift in the wavelength of light used, effecting charge transfer, and the formation/recombination of electron-hole pairs. Each of the methods mentioned above are investigated in terms of synthesis and photocatalytic efficiency, with the simplest being modification on the morphology of tungsten oxide, since it does not need synthesis of other materials, and the most efficient in photocatalytic degradation being complex coupling of metal oxides and carbon composites. The photocatalysis technology can be incorporated with water purification membrane by modularization process and applied to advanced water treatment system.

키워드

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