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Korean Journal of Chemical Engineering

, Volume 18, Issue 6, pp 941–947 | Cite as

Effect of precursors on the morphology and the photocatalytic water-splitting activity of layered perovskite La2Ti2O7

  • Jindo Kim
  • Dong Won Hwang
  • Sang Won Bae
  • Young Gul Kim
  • Jae Sung Lee
Article

Abstract

A [110] layered perovskite, La2Ti2O7, was a good photocatalyst under ultraviolet light in water splitting reaction. The material was synthesized with La2O3 and TiO2 as precursors by solid-state transformation. The morphology and photocatalytic activity of La2Ti2O7 depended on the preparation methods, as well as purity and morphology of the precursors. Wet-grinding of precursors in ethanol gave a product with higher crystallinity and phase purity, and thus higher photocatalytic activity, than dry-grinding without solvent. It was important to reduce the particle size of La2O3, as it usually had larger initial particle sizes than TiO2. Thus, the particle size of La2O3 had a strong effect on the crystallinity and surface area of the product La2Ti2O7. On the other hand, a severe chemical purity control was required for TiO2, while the effect of morphology was relatively small. In all cases, a high degree of crystallinity and purity of the prepared La2Ti2O7 was critical to show a high photocatalytic water-splitting activity.

Key words

Layered Perovskite Photocatalyst Water Splitting La2Ti2O7 Precursor 

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Copyright information

© Korean Institute of Chemical Engineering 2001

Authors and Affiliations

  • Jindo Kim
    • 1
    • 2
  • Dong Won Hwang
    • 1
    • 2
  • Sang Won Bae
    • 1
    • 2
  • Young Gul Kim
    • 1
    • 2
  • Jae Sung Lee
    • 1
    • 2
  1. 1.Department of Chemical EngineeringResearch Center for Catalytic Technology (RCCT)PohangKorea
  2. 2.School of Environmental Science & EngineeringPohang University of Science and Technology (POSTECH)PohangKorea

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