TY - JOUR
T1 - Photobleaching of Methylene Blue Aqueous Solution Sensitized by Composite Powders of Titanium Oxide with SrTiO3, BaTiO3, and CaTiO3
AU - Otsuka-Yao-Matsuo, Shinya
AU - Omata, Takahisa
AU - Ueno, Shin
AU - Kita, Masao
PY - 2003/10
Y1 - 2003/10
N2 - 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.
AB - 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.
KW - Composite particle
KW - Methylene blue
KW - Photobleaching
KW - Photocatalyst
KW - Strontium titanate
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U2 - 10.2320/matertrans.44.2124
DO - 10.2320/matertrans.44.2124
M3 - Article
AN - SCOPUS:0344253955
SN - 1345-9678
VL - 44
SP - 2124
EP - 2129
JO - Materials Transactions
JF - Materials Transactions
IS - 10
ER -