Fabrication of 3D Mesoporous Black TiO2/MoS2/TiO2 Nanosheets for Visible-Light-Driven Photocatalysis

A novel 3D mesoporous black TiO2 (MBT)/MoS2/MBT sandwich-like nanosheet was successfully fabricated using a facile mechanochemical process combined with an in situ solid-state chemical reduction approach, followed by mild calcination (350 degrees C) under an argon atmosphere. The MBT/MoS2/MBT exhibits a 3D sandwich-like nanosheet structure and heterojunctions are formed at the interfaces between MoS2 and black TiO2. The significantly narrowed band gap of MBT/MoS2/MBT is attributed to the introduction of MoS2 and the formed Ti3+ species in the frameworks. The visible-light photocatalytic degradation rate of methyl orange and the hydrogen production rate are as high as 89.86% and 0.56 mmol h(-1)g(-1), respectively. The introduction of MoS2 and Ti3+ in the frameworks favors the visible-light absorption and the separation of photogenerated charges, and the 3D sandwich-like heterojunction structure facilitates the transfer of photogenerated charges.