Photobleaching of methylene blue aqueous solution sensitized by composite powders of titanium oxide with SrTiO3, BaTiO3, and CaTiO3

被引：20

作者：

Otsuka-Yao-Matsuo, S ^{[1
]}

Omata, T ^{[1
]}

Ueno, S ^{[1
]}

Kita, M ^{[1
]}

机构：

[1] Osaka Univ, Grad Sch Engn, Dept Mat Sci & Proc, Suita, Osaka 5650871, Japan

来源：

MATERIALS TRANSACTIONS | 2003年 / 44卷 / 10期

关键词：

strontium titanate; photocatalyst; composite particle; photobleaching; methylene blue;

D O I：

10.2320/matertrans.44.2124

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have examined photocatalytic reactions sensitized by composite particles consisting of titanium oxide, and perovskite-type titanate containing alkaline earth elements. The photocatalytic activities of perovskite-type oxides SrTiO3, BaTiO3, and CaTiO3 are fairly weaker than that of anatase-type titanium dioxide TiO2; however, in photobleaching of methylene blue under irradiation with Xe discharge light, the composite particles with TiO2 exerted photocatalytic activity several times that of TiO2 alone. Especially, the composite powder containing 30 mass% SrTiO3 exhibited the highest photocatalytic activity. The results imply the flow of photogenerated electrons and holes through the heterogeneous junctions in the composite particles. The photocatalytic activity of the composite powder was decreased when the SrTiO3 was doped with Ga and Y, presumably because of recombination of the photogenerated charges via oxygen vacancies created by the doping.

引用

页码：2124 / 2129

页数：6

共 22 条

[1] SOLID-STATE REACTIONS AND DIELECTRIC PROPERTIES IN THE SYSTEMS MAGNESIA-ZIRCONIA-TITANIA AND LIME-ZIRCONIA-TITANIA [J].