Synergistic effect of surface plasmon resonance, Ti and oxygen vacancy defects on Ag/MoS/TiO ternary heterojunctions with enhancing photothermal catalysis for low-temperature wastewater degradation.

Ag/MoS/TiO ternary heterojunctions are fabricated through hydrothermal and photo-deposition process combine with in-situ solid-state chemical reduction approach. The prepared materials are characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, photoluminescence, and X-ray photoelectron spectroscopy. The results show that the ternary heterojunctions doped with Ti are formed, meanwhile, Ag nanoparticle and MoS nanosheets are anchored on surface of TiO nanobelts simultaneously. The photocatalytic degradation ratio of Bisphenol A in low temperature water and hydrogen production rate for Ag/MoS/TiO are up to 96.7% and ∼1.98 mmol h g, respectively, which are several times higher than that of pristine TiO. Furthermore, the photothermal performance of Ag/MoS/TiO is also unexpected. The excellent photocatalytic activity and photothermal performance can be ascribed to the synergistic effect of the formation of heterojunctions, Ti and surface oxygen vacancies defects and surface plasmon resonance of Ag nanoparticles, which extend the photoresponse to visible-infrared light region and favor the spatial separation of photogenerated charge carriers.