Synthesis of Hollow CdS-TiO₂Microspheres with Enhanced Visible-Light Photocatalytic Activity

Abstract

CdS-TiO 2 composite photocatalyst in the shape of hollow microsphere was successfully synthesized via the hard-template preparation with polystyrene microspheres followed by ion-exchange approach. The hollow CdS-TiO 2 microspheres significantly extended the light adsorption into visible light region, comparing to TiO 2 microspheres. It led to much higher photocatalytic activities of hollow CdS-TiO 2 microspheres than that of TiO 2 during the photodegradation of rhodamine B under visible light irradiations. Furthermore, the well-remained hollow structure could achieve light multireflection within the interior cavities and the separation of photo-induced electrons and holes is efficient in CdS-TiO 2 , which were facilitated to improving the photoactivity.