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http://dx.doi.org/10.3740/MRSK.2005.15.8.508

Synthesis of TiO2-Fe2O3 Nanocomposite Powders for Magnetic Photocatalyst  

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)
Publication Information
Korean Journal of Materials Research / v.15, no.8, 2005 , pp. 508-513 More about this Journal
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.
Keywords
magnetic photocatalyst; nanopowders; sol-gel process; band gap energy;
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