Photocatalytic Hydrogen Production in Water-Methanol Mixture over Iron-doped CaTiO 3

• Published in: Bulletin of the Korean Chemical Society Vol. 32; no. 1; pp. 95 - 99
• Main Authors: Jang, J. S, Borse, P. H, Lee, J. S, Lim, K. T, Jung, O. S, Jeong, E. D, Bae, J. S, Kim, H. G
• Format: Journal Article
• Language: Korean
• Published: 2011
• Subjects: Solid state reaction; Photocatalysis; Visible light; Fe doped $CaTiO_3; Hydrogen production
• ISSN: 0253-2964; 1229-5949

$CaTi_{1-x}Fe_xO_3(0{\leq}x{\leq}0.4)$ solid solution photocatalysts were synthesized by iron doping during the conventional solid state reaction at $1100^{\circ}C$ for 5 h and characterized by ultraviolet-visible (UV-vis) absorption spectroscopy, X-ray diffraction, morphological analysis. We found that $CaTi_{1-x}Fe_xO_3$ samples not only absorb UV but also the visible light photons. This is because the Fe substitution at Ti-site in $CaTi_{1-x}Fe_xO_3$ lattice induces the band transition from Fe3d to the Fe3d + Ti3d hybrid orbital. The photocatalytic activity of Fe doped $CaTiO_3$ samples for hydrogen production under UV light irradiation decreased with the increase in the Fe concentration. There exists an optimized concentration of iron in $CaTiO_3$, which yields a maximum photocatalytic activity under visible light ($\lambda\geq420nm$) photons.