The photocatalytic splitting of water into hydrogen and oxygen
and the photacatalytic degradation of organic pollutants are
promising reactions for solving urgent energy and environment
issues to day [1–4]. Lots of efforts have been exerted to design and
develop visible-light-responsive photocatalysts, because the visible
region constitutes about 45% and UV region constitutes 3–5% of
the total solar spectrum [5]. Various methods have been adopted to
improve the utilization of visible light [6–10]. Among the ma
good strategy is coupling of two semiconductors to form
composite photocatalysts because it has been reported that if two semiconductors are properly integrated into one system, this system
can be expected to achieve high photocatalytic activity [11].