Effect of Precursors on the Morphology and the Photocatalytic Water-Splitting Activity of Layered Perovskite La2Ti2O7

被引：0

作者：

Kim J. ^{[1
,2
]}

Hwang D.W. ^{[1
,2
]}

Bae S.W. ^{[1
,2
]}

Kim Y.G. ^{[1
,2
]}

Lee J.S. ^{[1
,2
]}

机构：

[1] Department of Chemical Engineering, Research Center for Catalytic Technology (RCCT), Pohang, 790-784

[2] School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 790-784

来源：

Korean Journal of Chemical Engineering | 2001年 / 18卷 / 6期

关键词：

La[!sub]2[!/sub]Ti[!sub]2[!/sub]O[!sub]7[!/sub; Layered Perovskite; Photocatalyst; Precursor; Water Splitting;

D O I：

10.1007/BF02705623

中图分类号：

学科分类号：

摘要：

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.

引用

页码：941 / 947

页数：6

共 20 条

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