Multi-channel electron transfer induced by polyvanadate in metal-organic framework for boosted peroxymonosulfate...

Area of Science:

• Environmental Chemistry
• Materials Science
• Catalysis

Background:

• Peroxymonosulfate (PMS) activation for pollutant degradation is complex, involving more than just metal-center electron transfer.
• Catalyst composition and interface significantly influence PMS activation efficiency.

Purpose of the Study:

• To synthesize and evaluate a novel cobalt-based metal-organic framework containing a polyvanadate cluster for enhanced PMS activation.
• To elucidate the mechanism of pollutant degradation via nonradical pathways.

Main Methods:

• Synthesis of Co2(V4O12)(bpy)2 catalyst.
• Micropollutant degradation assays.
• X-ray absorption spectroscopy (XAS).
• Density functional theory (DFT) calculations.
• In situ spectral characterizations.

Main Results:

• The Co2(V4O12)(bpy)2 catalyst exhibited superior degradation activity against various micropollutants.
• Co sites function as both PMS trappers and electron donors.
• The polyvanadate cluster's terminal oxygen atoms form hydrogen bonds with PMS, promoting SO5* intermediate generation.
• The catalyst demonstrated effective water purification for 40 hours using actual industrial wastewater.

Conclusions:

• Co2(V4O12)(bpy)2 is an efficient catalyst for water remediation through a nonradical pathway.
• The study provides fundamental insights into Fenton-like reaction mechanisms involving polyvanadate clusters.
• This work highlights the potential of metal-organic frameworks with electron-rich clusters for advanced oxidation processes.