Construction of MoS ₂ /TiO ₂ Heterojunction for Excellent Photocatalytic Degradation of Tetracycline

Abstract

Abstract A series of MoS 2 /TiO 2 heterojunction photocatalysts were prepared through the hydrothermal method and were analyzed via many characterizations. The tetracycline hydrochloride (TCH) was used to evaluate the performance of the photocatalysts under visible light. Compared with TiO 2 , the MoS 2 /TiO 2 heterojunction has increased inhomogeneity and uneven grain size. The MoS 2 /TiO 2 heterojunction exhibited the best activity for TCH degradation with a removal rate of 95.4 % in 120 min with a rate constant of. The reaction rate constants of MoS 2 /TiO 2 heterojunction (0.0236 min −1 ) were 2.6 times and 18.2 times of the pure TiO 2 and MoS 2 (0.0090 min −1 and 0.0013 min −1 ), respectively. The research on the photocatalytic mechanism suggested that the charge transfer path conforms to the II‐scheme model, in which h + and e − play a crucial role. This research provides strong practical support for the preparation of II‐scheme high‐efficiency photocatalytic materials.