MoS 2 /FeS Nanocomposite Catalyst for Efficient Fenton Reaction.

Nanocomposites containing FeS as catalyst and MoS ₂ as cocatalyst have been synthesized toward efficient heterogeneous Fenton reaction. The deposition of FeS nanoparticles in situ on the surface of MoS ₂ nanosheets creates strong contact between the two components and generates a large number of exposed Mo ⁶⁺ sites and sulfur vacancies, which contribute to the enhanced degradation rate by accelerating Fe ³⁺ /Fe ²⁺ cycling and ensuring rapid electron transfer. In addition, the MoS ₂ /FeS nanocomposite catalysts exhibit the best performance at near-neutral conditions (pH 6.5), which solves the challenges in conventional Fenton reactions such as leaching of metal ions, the formation of iron slurry, and the need of adjusting solution pH. Further, the nanocomposite can maintain high efficiency after many recycling experiments. It is believed that the MoS ₂ /FeS nanocomposite represents an efficient heterogeneous Fenton catalyst that can greatly promote the performance of advanced oxidation processes (AOPs) for solving practical environmental issues.