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

A novel heterogeneous catalyst PB@MoS was successfully synthesized via facile hydrothermal processes and identified as a superior peroxymonosulfate (PMS) activator for organic pollutants degradation under visible light irradiation. The MoS 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 MoS, as confirmed by Fe M̈össbauer spectra and electrochemical measurement, the PB@MoS 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@MoS catalyst promoted the Fe/Fe cycling and electron transport and further triggered the reactive species (SO, OH, O 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/MoS catalyst for environmental restoration and remediation by photo-Fenton reaction.