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Size-selective photocatalytic reactions by titanium(iv) oxide coated with a hollow silica shell in aqueous solutions

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Title: Size-selective photocatalytic reactions by titanium(iv) oxide coated with a hollow silica shell in aqueous solutions
Authors: Ikeda, Shigeru Browse this author →KAKEN DB
Kobayashi, Hideyuki Browse this author
Ikoma, Yoshimitsu Browse this author
Harada, Takashi Browse this author
Torimoto, Tsukasa Browse this author →KAKEN DB
Ohtani, Bunsho Browse this author →KAKEN DB
Matsumura, Michio Browse this author →KAKEN DB
Issue Date: 2007
Publisher: Royal Society of Chemistry
Journal Title: Physical Chemistry Chemical Physics
Volume: 9
Issue: 48
Start Page: 6319
End Page: 6326
Publisher DOI: 10.1039/b709891j
Abstract: A novel core–shell composite photocatalyst, commercially available titanium(IV) oxide (TiO2) particles directly incorporated into a hollow amorphous silica shell, was fabricated by successive coating of TiO2 with a carbon layer and a silica layer followed by heat treatment to remove the carbon layer. The composite induced efficient photocatalytic reactions when relatively small substrates were used, such as methanol dehydration and decomposition of acetic acid, without any reduction in the intrinsic activity of original TiO2, but did not exhibit efficient photocatalytic activity for decomposition of large substrates, methylene blue and polyvinyl alcohol. The unique size-selective properties of the composites are due to their structural characteristics, i.e., the presence of a pore system and a void space in the silica shell and between the shell and medial TiO2 particles, respectively. The loading of alkylsilyl groups on the surface of the composite led to highly photostable floatability: the floated sample also induced efficient photocatalytic reaction for decomposition of acetic acid while retaining floatation at the gas/water interface.
Rights: Phys. Chem. Chem. Phys., 2007, 9, 6319-6326 - Reproduced by permission of the PCCP Owner Societies
Type: article (author version)
Appears in Collections:触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大谷 文章

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