Enhanced visible-light photocatalytic performance of cadmium sulfide film via annealing treatment

In this study, cadmium sulfide (CdS) film prepared through a simple homogeneous precipitation method is used for methylene blue degradation. An enhanced visible-light photocatalytic performance of CdS film can be observed after the N2 annealing treatment. This enhancement in photocatalytic activity can be attributed to the higher crystallinity, better optical absorption, and efficient photogenerated carrier transfer performance of samples. The N2 annealed CdS films also display the optimum reproducibility in recycling reactions, which is beneficial for its practical application. This study provides a reference for preparing other catalysts with high photocatalytic activity and stability for degradation of dye under visible light.