Nitrogen-doped carbon-based catalysts have been reported to be effective in activating peroxymonosulfate (PMS). Herein our study found that the degradation rate constant of bisphenol A (BPA) folded up 27 times as a result of PMS activation via nitrogen and oxygen co-doped carbon nanomaterial (NOC) to compare pristine sludge carbon (SC). Besides, NOC showed remarkable removal efficiency of other emerging organics, exhibited high resistance to the natural water composition, a wide application range of pH values, and excellent stability. Furthermore, the relation between the difference in surface chemistry (surface functional groups, electronic properties) and reaction rate between SC and NOC was deliberated. Quenching experiments, quantification of PMS, and electrochemical measurements revealed the existence of a multi-pathway synergy in the NOC/PMS system overruled by the non-radical electron-transfer pathway and elaborated by the non-radical (1O2) pathway. Mainly, quaternary-N, edge nitrogens, and adequate carbonyl groups on NOC governed the non-radical oxidation pathway of BPA degradation via PMS activation. This work verifies the substantial role of the surface chemistry of carbon materials and the synergy between non-radical electron transfer and radical/non-radical oxidation on the catalytic velocity. And that can be effectively elevated by designing oxygen and nitrogen sites into carbon catalysts for green and ecologically sustainable water treatment as material derived from waste biomass.

Insight into peroxymonosulfate activation with nitrogen and oxygen-functionalized nanocarbon catalysts to degrade bisphenol A

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