Key Words:Bismuth compounds;Cadmium telluride - Heterojunctions - II-VI semiconductors - Light - Light absorption - Microspheres - Nanocrystals - Photocatalysis - Photocatalytic activity - Semiconductor quantum dots - Titanium dioxide
Abstract:Hollow and heterostructured architectures are recognized as an effective approach to improve photocatalytic performance. In this work, ternary TiO<inf>2</inf>/CdTe/BiOI with hollow structure was constructed via a step-by-step method. In addition, the effect of TiO<inf>2</inf> structural regulation and the energy band alignment of BiOI and CdTe quantum dots (CdTe QDs) with TiO<inf>2</inf> in TiO<inf>2</inf>/CdTe/BiOI on photocatalytic dye removal were also studied. The results reveal that the TiO<inf>2</inf>/CdTe/BiOI heterostructures with hollow substrates exhibit much higher photocatalytic activities than pure TiO<inf>2</inf>, P25, TiO<inf>2</inf>/CdTe, and TiO<inf>2</inf>/BiOI and ternary TiO<inf>2</inf>/CdTe/BiOI with solid substrates. For TiO<inf>2</inf>(H)/CdTe/BiOI, several synergistic factors may be responsible for the remarkable visible-light photodegradation performance, such as strong visible-light absorption by BiOI and larger specific surface area.<br/> © 2019, The Author(s).
Volume:14
Issue:
Translation or Not:no