期刊
出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2201607119
关键词
spinel oxides; peroxymonosulfate (PMS); superexchange; delocalization; octahedron
资金
- National Natural Science Foundation of China [52192681, U21A20160, 51821006]
- Key Research and Development Program of Anhui Province [202104i07020003]
This study investigates the catalytic mechanism of Fe-Mn spinel oxide catalysts, creating a catalyst capable of efficiently degrading pollutants by fine-tuning its crystal structure, with potential importance for water purification applications.
Nonradical Fenton-like catalysis offers opportunities to overcome the low efficiency and secondary pollution limitations of existing advanced oxidation decontamination technologies, but realizing this on transition metal spinel oxide catalysts remains challenging due to insufficient understanding of their catalytic mechanisms. Here, we explore the origins of catalytic selectivity of Fe-Mn spinel oxide and identify electron delocalization of the surface metal active site as the key driver of its nonradical catalysis. Through fine-tuning the crystal geometry to trigger Fe-Mn superexchange interaction at the spinel octahedra, ZnFeMnO4 with high-degree electron delocalization of the Mn-O unit was created to enable near 100% nonradical activation of peroxymonosulfate (PMS) at unprecedented utilization efficiency. The resulting surface-bound PMS* complex can efficiently oxidize electron-rich pollutants with extraordinary degradation activity, selectivity, and good environmental robustness to favor water decontamination applications. Our work provides a molecule-level understanding of the catalytic selectivity and bimetallic interactions of Fe-Mn spinel oxides, which may guide the design of low-cost spinel oxides for more selective and efficient decontamination applications.
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