Nitrogen-doped bimetallic MOFs derivatives for efficient ionizing radiation catalytic degradation of chloramphenicol

Abstract

Electron beam (EB) irradiation has received increased attention in sewage disposal due to the high efficiency, no additional chemicals and wastes produced. However, it’s still limited by relatively high processing costs. In this work, we report a novel nitrogen-doped Fe/Ni bimetallic metal organic frameworks (MOFs) derivative for efficient ionizing radiation catalytic degradation of chloramphenicol (CAP). Compared with the single EB irradiation, the radiation-catalytic process allows a 2.8-fold increment in degradation rate constant and a 21.2-fold enhancement in the TOC removal rate. The EPR experimental results confirmed that the optimized composite catalyst significantly enhances the generation of hydroxyl radicals. Intriguingly, the synergistic effect of Fe/Ni element in the valence state were observed in the radiation-catalytic process, in which the generation of Fe2+ promoted the production of hydroxyl radical. The adsorption experiments reveal that most of the high removal effect origins from complete degradation rather than the adsorption effect. These key indicators of irradiation degradation are all the highest compared to the reported literature. In addition, the catalyst also has excellent cycle stability under irradiation. The high-performance ionizing radiation catalytic degradation in synergy with bimetallic MOFs derivatives provides a facile and general strategy for efficient EB irradiation treatment of organic wastewater.