ABSTRACT
Introduction Photoinduced charge transfer occurring on semiconductor materials can achieve direct conversion of photo energy to chemical energy, and thus it can be used for elimination of organic pollutants and splitting water into hydrogen. However, the utility of semiconductor-based photocatalytic process is controlled to a large extent by the separation eciency of the initially formed excited states ( vb cbh and e+ - ) [1]. A variety of approaches was made to enhance electron-accepting or electron-donating ability of the material surface to favor the interfacial charge separation and consequently increase the photocatalytic eciency. One approach involves addition of surface adsorbed redox species capable of scavenging selectively either of the excited states to the photoreaction system [2, 3]. Another promising approach concerns modication of TiO2 with noble metals, other semiconductors, and coloring matters to improve the separation of the excited states [4-6].
