ZIFs material-derived bimetallic oxide heterojunctions activate perodisulfate to degrade chlortetracycline rapidly: The synergistic effects of oxygen vacancies and rapid electron transfer

Abstract

The bimetallic oxides heterojunction structure from new 3D-ZIF was prepared to degrade the chlortetracycline by PDS activation. The system achieved more than 95 % degradation of chlortetracycline within 40 min. Theoretical calculations and physicochemical characterization of the NiZnCo-N-C proved that the material had better electron transfer properties and multi-site reactivity, and the presence of Zn provided an effective intermediate medium for the reaction of Co and Ni, while the non-metallic N-C component also constituted good electron reaction sites. Meanwhile, the existence of abundant oxygen vacancies established the good foundation for the formation of oxygen radicals in the material, and the rapid electron transfer processes speeded up non-radical processes such as electron transfer and 1O2.The combination of two degradation pathways reduced the impact of environmental factors, the PDS + NiZnCo-N-C system exhibited relatively stable or even better performance in the existence of inorganic anions. Furthermore, the structure of the NiZnCo-N-C had the smallest d-band center, which efficiently adsorbed PDS molecules and broke the O-O bond in PDS. DFT Conclusion and LC-MS of CTC suggested the various reaction processes in the system. Our study provided new solutions and insights for the organic pollutions in the aquatic environment.