Construction and photocatalytic properties of the Zn doping on CdS

Zn-doped CdS powder was synthesized by coprecipitation-hydrothermal method. XRD, SEM, TEM, UV–Vis DRS, PL, EIS and other characterization methods were used to study the morphology, electron–hole pair recombination efficiency and photocarrier migration rate, and analyze the degradation of methylene blue. When the molar ratio of Zn2+ doping is 50%, the photocatalytic efficiency reaches 82.45% at 240 min, and the reaction rate constant is 0.01103 min−1. The reaction rate is 6.89 times of CdS and 8.48 times of ZnS, respectively. O2−· plays a major role in the photocatalytic degradation process. After four cycles of experiments, the photocatalytic performance is relatively good, the phenomenon of CdS photocorrosion is improved, and the stability is improved.