Nitrogen doped Cu/Fe@PC derived from metal organic frameworks for activating peroxymonosulfate to degrade Rhodamine B

Abstract

Nitrogen doped Cu/Fe@PC (Cu/Fe@PC-N) nanocomposite with core-shell structure was successfully prepared by one-step pyrolysis with g-C3N4 doped Cu/Fe-MOF. It was used as catalyst to active peroxymonosulfate (PMS) to degrade rhodamine B. The degradation of rhodamine B was a microelectrolysis-Fenton-like degradation process dominated by adsorption and PMS activation with non-free radical singlet oxygen (1O2). It was mainly realized by cracking, ring opening and mineralization of chromophore group. Within 30 min, the degradation efficiency of 50 mg/L RhB reached 100%, and the rate constant reached 0.5307 min-1. The excellent performance of Cu/Fe@PC-N catalyst was attributed to the synergistic effect of Cu and Fe. The doping of Cu not only accelerated the electron transmission and promoted the effective reduction of Fe2+, but also formed a circulating system of Fe2+/Fe3+ and Cu+/Cu2+, which ensured the efficient catalytic activity of the catalyst. This study provides some insights for pollutants degradation by microelectrolysis-Fenton-like system.