Growth of MoS2 nanosheets on TiO2/g-C3N4 nanocomposites to enhance the visible-light photocatalytic ability

Abstract

TiO2/g-C3N4/MoS2 nanocomposite photocatalysts were synthesized via two-steps in situ solvothermal method. The nanocomposites exhibit an extended visible-light photoresponse, higher efficiency of charge carriers separation, and improved photocatalytic degradation of methylene blue (MB). TiO2/g-C3N4/MoS2 nanoparticles enjoys much higher degradation ratio (95%) under visible light illumination for 30 min than P25 (63%), TiO2/g-C3N4 (45%) and TiO2 (26%). The heterojunctions of TiO2/g-C3N4 and TiO2/MoS2 play a main role in the enhanced photocatalytic performance. The electrons generated in MoS2 and g-C3N4 under visible light migrate to the conduction band of TiO2 to degrade MB dye. The heterojunctions can enhance the separation of photogenerated electron–hole pairs and improve the utilization of photons. This work demonstrates that synergetic effect of g-C3N4 and MoS2, which is a good choice to improve the utilization of visible light of TiO2-based materials.