Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Synthesis of TiO2-Fe2O3 Nanocomposite Powders for Magnetic Photocatalyst

자성광촉매용 TiO2-Fe2O3 나노복합분말의 합성

  • Lee Chang-Woo (Department of Metallurgy and Materials Science, Hanyang University) ;
  • Kim Soon-Gil (Department of Metallurgy and Materials Science, Hanyang University) ;
  • Yun Sung-Hee (Department of Metallurgy and Materials Science, Hanyang University) ;
  • Lee Jai-Sung (Department of Metallurgy and Materials Science, Hanyang University) ;
  • Choa Yong-Ho (Department of Chemical engineering, hanyang University)
  • 이창우 (한양대학교 공학대학 금속재료공학과) ;
  • 김순길 (한양대학교 공학대학 금속재료공학과) ;
  • 윤성희 (한양대학교 공학대학 금속재료공학과) ;
  • 이재성 (한양대학교 공학대학 금속재료공학과) ;
  • 좌용호 (한양대학교 공과대학 화학공학과)
  • Published : 2005.08.01
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Abstract

[ $TiO_2-Fe_2O_3$ ] nanocomposite powders for magnetic photocatalyst were synthesized by sol-gel process, in which $TiO_2$ photocatalytic layer was formed on the surface of $\gamma-Fe_2O_3$ magnetic core. Transmission electron microscopy (TEM) observation and X-ray diffractometry (XRD) analysis revealed that$\gamma-Fe_2O_3$ nanoparticles, $10\~20nm$ in diameter, were coated by $TiO_2$ shell of 5nm in thickness and $TiO_2$ was anatase phase. Also hydroxyl group (-OH) used to decompose organic compounds was detected by Fourier transformation infrared spectrometry(FT-IR) analysis. UV-Visible spectrophotometry results showed that light absorption occurred in the wavelength range of $400\~700 nm$, and the band gap energy $(E_g)$ of powder was 1.8 eV. Finally it was found that the coercivity $(H({ci})$ and saturation magnetization $(M_s)$ of the powder were 79 Oe and 14.8 emu/g, respectively as experimental vibrating sample magnetometer (VSM) measurements.

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References

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