Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Evaluation of TiO2 Photocatalytic Activity with Addition of Carbon Nanotube

탄소나노튜브(CNT)의 첨가에 따른 TiO2의 광촉매 특성 변화 연구

  • Yeo, In-Chul (Department of Mechanical Engineering, Incheon National University) ;
  • Kang, In-Cheol (Sports & Materials Technology Center, Incheon Economy Industry Information Technopark)
  • 여인철 (인천대학교 기계공학과) ;
  • 강인철 ((재)인천경제산업정보테크노파크 스포츠융합센터)
  • Received : 2016.11.08
  • Accepted : 2016.12.19
  • Published : 2016.12.28
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Abstract

A $TiO_2$/CNT nanohybrid photocatalyst is synthesized via sol-gel route, with titanium (IV) isopropoxide and multi-walled carbon nanotubes (MWCNTs) as the starting materials. The microstructures and phase constitution of the nanohybrid $TiO_2$/CNT (0.005wt%) samples after calcination at $450^{\circ}C$, $550^{\circ}C$ and $650^{\circ}C$ in air are compared with those of pure $TiO_2$ using field-emission scanning electron microscopy and X-ray diffraction, respectively. In addition, the photocatalytic activity of the nanohybrid is compared with that of pure $TiO_2$ with regard to the degradation of methyl orange under visible light irradiation. The $TiO_2$/CNT composite exhibits a fast grain growth and phase transformation during calcination. The nanocomposite shows enhanced photocatalytic activity under visible light irradiation in comparison to pure $TiO_2$ owing to not only better adsorption capability of CNT but also effective electron transfer between $TiO_2$ and CNTs. However, the high calcination temperature of $650^{\circ}C$, regardless of addition of CNT, causes a decrease in photocatalytic activity because of grain growth and phase transformation to rutile. These results such as fast phase transformation to rutile and effective electron transfer are related to carbon doping into $TiO_2$.

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