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Received September 17, 2001
Accepted October 5, 2001
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Effect of Precursors on the Morphology and the Photocatalytic Water-Splitting Activity of Layered Perovskite La2Ti2O7
Research Center for Catalytic Technology(RCCT), Department of Chemical Engineerign, School of Environment Science & Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-Dong, Pohang 790-784, Korea
jlee@postech
Korean Journal of Chemical Engineering, November 2001, 18(6), 941-947(7), 10.1007/BF02705623
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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.
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