Res. Chem. Intermed., Vol. 29, No. 6, pp. 631–639 (2003)
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Development of rectangular column structured titanium
oxide photocatalysts anchored on silica sheets
by a wet process
, YUKO NAKAMURA and AZUMA RUIKE
Andes Electric Co., Ltd., 2-676 Choshichiyachi, Ichikawa-machi, Hachinohe-city,
Aomori, 039-2241, Japan
Received 5 April 2003; accepted 7 May 2003
Abstract—Commercially available powdered photocatalysts such as P-25 are known to show high
photocatalytic performance. However, in practical use, their anchoring onto a substrate without any
binders is still very dif cult. The purpose of this study is to design and develop high-performance
photocatalysts that can be anchored onto a substrate, and to this end we have prepared a titanium
oxide photocatalyst using a wet process. The results of this study led to the successful development of
rectangular column structured titanium oxide crystals which could be anchored onto silica sheets.
The rectangular columnar crystal was 100 – 500 nm wide and 1000– 5000 nm long. Moreover,
investigations on the complete oxidation reaction of acetaldehyde into CO
O showed a high
performance equivalent to that of the most ef cient marketed powdered photocatalysts.
: Rectangular column structured TiO
; photocatalyst; anchored TiO
; silica sheet.
In recent years, environmental pollution and the resulting health problems caused
by chemical substances have become a grave social concern. To address these prob-
lems, the development and application of environmental puri cation systems using
photocatalysts have been actively carried out by universities, research institutes and
A photocatalytic reaction occurs by the irradiation of UV lights which is absorbed
by a titanium oxide photocatalyst, leading to the generation of electrons (e
). When absorbed water molecules are present on the surface of the
photocatalysts, these adsorbed water molecules are oxidized by the holes, resulting
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