Self-assembly of MoS₂ nanosheet adhered on Fe-MOF heterocrystals for peroxymonosulfate activation via interfacial...

A novel heterogeneous catalyst PB@MoS₂ was successfully synthesized via facile hydrothermal processes and identified as a superior peroxymonosulfate (PMS) activator for organic pollutants degradation under visible light irradiation. The MoS₂ nanosheet is uniformly adhered to the surface of iron-based metal-organic framework Prussian blue (PB) cube, exhibiting a tightly hydrangeas-like structure. Benefiting from strongly interfacial interaction (FeMo-sulfide) between PB and MoS₂, as confirmed by ⁵⁷Fe M̈össbauer spectra and electrochemical measurement, the PB@MoS₂ catalyst significantly accelerate the charge carrier transfer via interfacial FeMo-sulfide and thereby improve PMS activation ability to generate abundant reactive radicals. Moreover, the crucial iron active site was steadily validated by introduction of sodium oxalate trapping agent and visible light. In summary, the visible light induced Fenton-like reaction over PB@MoS₂ catalyst promoted the Fe^II/Fe^III cycling and electron transport and further triggered the reactive species (SO₄^-, OH, O₂^- and h⁺) productivity, realizing an extraordinarily high degradation and mineralization efficiency for various refractory organic pollutants. This work would provide a deep insight into develop heterogeneous Fe-based metal organic framework/MoS₂ catalyst for environmental restoration and remediation by photo-Fenton reaction.