Preparation of carbon quantum dots/ TiO2 nanotubes composites and their visible light catalytic applications

Abstract

Carbon quantum dots/TiO₂ nanotubes composites were prepared by a simple technical route through which TiO₂ nanotubes prepared by electrospinning were dispersed in carbon quantum dots solution, and dried at 80 °C. The results indicated that the TiO₂ nanotubes composites were combined with the carbon quantum dots. The photocatalytic activity of the carbon quantum dots/TiO₂ nanotubes composites was investigated by the degradation of rhodamine B under visible light irradiation, and it was demonstrated to be significantly enhanced compared with that of pure TiO₂ nanotubes. Through analysis, this enhancement of visible light photocatalytic activity was attributed to the carbon quantum dots with the unique up-converted photoluminescence behavior.