Co-Fe synergistic interaction mediated novel peroxymonosulfate activators: High-efficiently degradation and outstanding mineralization

Abstract

The search for immobilization methods is the key to current research on environmentally friendly catalysts. In this study, Fe-Co bimetallic organic framework material was prepared by microwave hydrothermal method. After further carbonization, structural frame self-fixing catalyst Fe/CoC was obtained for the activation of peroxymonosulfate (PMS). Based on a stable three-dimensional structure, high specific surface area, variable polymetallic ion valence and remarkable catalytic performance, Fe/CoC achieved 99.59 % treatment efficiency and 93.38 % mineralization efficiency of norfloxacin (NOR) within 30 min. The universality was evaluated in multiple antibiotics and actual water configuration solutions. The matching redox potentials and synergistic interactions between the bimetals enhanced the activation catalytic efficiency, which was attributed to the generation of radical SO4•− and non-radical 1O2. In addition, the voltammetry characteristic curve proved the existence of direct electron transfer in the system. Finally, a relatively complete NOR degradation pathways were proposed based on the 13 intermediates. This work has enriched the development of stable catalysts for PMS activation and provided a new idea for MOFs to participate in antibiotic removal.