| Issue |
Korean Journal of Chemical Engineering,
Vol.18, No.6, 941-947, 2001
Vol.18, No.6, 941-947, 2001
Effect of Precursors on the Morphology and the Photocatalytic Water-Splitting Activity of Layered Perovskite La2Ti2O7
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.
[References]
- Balachandran U, Eror NG, J. Mater. Res., 4, 1525, 1989
- Boddy P, J. Electrochem. Soc., 115, 199, 1968
- Damme HV, Hall WK, J. Am. Chem. Soc., 101, 4273, 1979
- Domen K, Kudo A, Shinozaki A, Tanaka A, Maruya K, Onishi T, J. Chem. Soc.-Chem. Commun., 356, 1986
- Fujishima A, Honda K, Bull. Chem. Soc. Jpn., 44, 1148, 1971
- Fujishima A, Honda K, Nature, 238, 37, 1972
- Hwang DW, Kim HG, Kim J, Cha KY, Kim YG, Lee JS, J. Catal., 193(1), 40, 2000
- Ishizawa N, Marumo F, Iwai S, Kimura M, Kawamura T, Acta Crystallogr. Sect. B-Struct. Sci., 38, 368, 1982
- Kim HG, Hwang DW, Kim J, Kim YG, Lee JS, J. Chem. Soc.-Chem. Commun., 1077, 1999
- Kudo A, Kato H, Nakagawa S, J. Phys. Chem. B, 104(3), 571, 2000
- MacChesney JB, Sauer HA, J. Am. Ceram. Soc., 45, 416, 1962
- Marzullo S, Bunting EN, J. Am. Ceram. Soc., 41, 40, 1958
- Sakata T, Kawai T, "Energy Resources Through Photochemistry and Catalysis," Gratzel, M. Ed., Academic Press, New York, 1983
- Schmalle HW, Williams T, Reller A, Linden A, Bednorz G, Acta Crystallogr. Sect. B-Struct. Sci., 49, 235, 1993
- Shin YJ, Doumerc JP, Dordor P, Delmas C, Pouchard M, Hagenmuller P, J. Solid State Chem., 107(2), 303, 1993
- Wanger FT, Somorjai GA, J. Am. Chem. Soc., 102, 5494, 1980
- Williams R, J. Chem. Phys., 32, 1505, 1960
- Williams T, Schmalle H, Reller A, Lichtenberg F, Widmer D, Bednorz G, J. Solid State Chem., 93, 534, 1991
- Zhong YJ, Azough F, Freer R, J. Eur. Ceram. Soc., 15, 255, 1995
[Cited By]
참고문헌정보(참고문헌, 인용문헌)는 화학공학소재연구정보센터에 의해 제공되고 있습니다.