Tailored oxygen defect coupling composition engineering Co Mn2O4 spinel hollow nanofiber enables improved Bisphenol A catalytic degradation

Hollow nanofiber composed of Co2Mn2O4 nanocrystals with modulated composition engineering and tailored oxygen-vacancy sites was constructed through electrospinning and successive thermal treatment, rendering improved activated efficiency of peroxymonosulfate (PMS) in Bisphenol A (BPA) degradation. Importantly, the similar coordination orbits of Co and Mn allow them to occupy simultaneously tetrahedral and octahedral sites of spinel configuration in a stable state even by tuning Mn/Co composition. The XPS results further reveal that tailored oxygen-vacancy sites were given by tuning composition engineering in CoxMn2O4 spinel. Impressively, the rational composition proportion could further induce the regulation of most active Co(II) and Mn(III) in spinel for promoting electron-transferring and enhancing catalytic property. The catalytic tests revealed that the CMO catalyst affords the best degradation activity of BPA (k = 0.229 min−1, 30 mg L-1) by the improved activation of pmonopersulfate over the optimized oxygen vacancy of spinel, whose superiority for adsorption and activation of PMS was further elucidated by Density-Functional-Theoretical calculation.