Res. Chem. Intermed.
, Vol. 31, No. 4–6, pp. 499–503 (2005)
Also available online - www.vsppub.com
Decomposition of acetaldehyde on a Bi-based
, ZHIGANG ZOU
and JINHUA YE
Ecomaterials Center, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba,
Ibaraki 305-0047, Japan
Photoreaction Control Research Center (PCRC), National Institute of Advanced Industrial Science
and Technology (AIST), Higashi, Tsukuba, Ibaraki 305-8565, Japan
Received 3 February 2004; accepted 6 May 2004
Abstract—A Bi-based photocatalyst (BaBi
) was prepared by the solid-state reaction method
and its optical absorption properties were determined by UV-visible diffuse reﬂectance spectrum. Fur-
thermore, the photocatalytic properties of the oxide for acetaldehyde decomposition were investigated.
The results show that the present Bi-based material is very active in photocatalytic organic decompo-
sition under visible light irradiation.
Keywords: Bi-based photocatalyst; acetaldehyde; visible light.
Among the advanced oxidation technologies, photocatalytic decomposition of
organic contaminants has attracted considerable attention . Up to now, TiO
has undoubtedly been proven to be the most excellent photocatalyst for oxidative
decomposition of many organics under UV irradiation [1 –3]. However, the
relatively large band gap of 3.2 eV of TiO
reduces the options for application of this
material in the visible light region. In view of the efﬁcient utilization of visible light,
such as the large portion of solar spectrum and artiﬁcial light, it is indispensable to
develop a photocatalyst with high activity at a wide range of visible light.
There are two ways to explore a photocatalyst responsive to visible light. One
is to modify TiO
, the other is to develop a new material. The former has been
extensively investigated by doping or ion implanting method which makes TiO
visible-light-sensitive [4, 5]. On the other hand, there are only few reports on the
latter way. Up to now, we have succeeded in synthesizing several visible-light-
To whom correspondence should be addressed. E-mail: firstname.lastname@example.org