Diatomic Fe-Fe catalyst enhances the ability to degrade organic contaminants by nonradical peroxymonosulfate activation system
Nano Research(2023)
Abstract
Atomically dispersed catalysts have been widely studied due to their high catalytic activity and atom utilization. Single-atom catalysts have achieved breakthrough progress in the degradation of emerging organic contaminants (EOCs) by activating peroxymonosulfate (PMS). However, the construction of atomically dispersed catalysts with diatomic/multiatomic metal active sites by activating PMS to degrade pollutants is still seldom reported, despite the unique merits of atom-pair in synergistic electronic modulation and breaking stubborn restriction of scaling relations on catalytic activity. We have synthesized Fe 1 −N−C, Fe 2 −N−C, and Fe 3 −N−C catalysts with monoatomic iron, diatomic iron, and triatomic iron active center, respectively. The results show that the catalytic degradation activity of Fe 2 −N−C is twice that of Fe 1 −N−C and Fe 3 −N−C due to its unique Fe 2 N 6 coordination structure, which fulfilled the complete degradation of rhodamine B (RhB), bisphenol A (BPA), and 2,4-dichlorophenol (2,4-DP) within 2 min. Electron paramagnetic resonance (EPR) and radical quenching experiments confirmed that the reaction was a nonradical reaction on the catalyst surface. And singlet oxygen and Fe(IV) are the key active species.
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Key words
diatomic catalyst,peroxymonosulfate,nonradical,contaminant
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