Design of the Nanocrystalline CdS@TiO2 Photocatalyst

摘要

Purification of water and air from organic pollutants is currently an acute problem [1-3]. Photocatal-ysis on semiconductors is widely used as a purification method. The photocatalytic water treatment method involves, in most cases, oxidation on titania (TiO2) under UV irradiation. From the standpoint of practical use, the major drawback of TiO2 is its rather wide band gap and, as a result, low photoactivity under sunlight, in which wavelengths shorter than 365 nm account for only a few percent [4, 5]. Therefore, to enhance the catalytic process efficiency, it is necessary to displace the absorption band of the TiO2 photocatalyst toward longer wavelengths of optical spectrum.