| 초록 |
La2Ti2O7, a [110] layered perovskite, has good photocatalytic activity in water splitting reaction. La2Ti2O7 could be synthesized with La2O3 and TiO2 asprecursors by the solid transformation. In the preparation of La2Ti2O7, purities and morphologies of the precursors have great effects on the morphology and photocatalytic activity of La2Ti2O7. It's important to reduce the particle size of La2O3, as La2O3 has larger particle size than TiO2 normally. Particle size of La2O3 has strong effect on the crystallinity and surface area of the product La2Ti2O7 . As a precursor of photocatalyst, TiO2 is required a severe purity control and free from the morphology control relatively. This could be deduced from when a highly pure rutile TiO2 of small surface area was used as precursor for La2Ti2O7 and resulted a high activity phase. Photocatalytic activity of La2Ti2O7 is dropped sharply as the purity of precursor TiO2 is lowered quite a little. Dispersion states of the impurities of TiO2 have great effect on the photocatalytic activity of La2Ti2O7. |
