Fe-polyoxometalate nanodots decorated Bi2MoO6 nanosheets with dominant {010} facets for photo-Fenton degradation of antibiotics over a wide pH range: Mechanism insight and toxicity assessment

It remains challenging to rationally design ultra-efficient and reusable heterogeneous photo-Fenton catalysts with a wide pH working range for environmental remediation. Here, Fe-polyoxometalate (Fe-POM)-modified Bi2MoO6 with dominant {010} facets, denoted as Fe-POM/BMO, was elaborately designed and synthesized for the degradation of typical antibiotics. Benefiting from the synergistic effect of oxygen vacancies and the Fe3+/ Fe2+ redox couple, the Fe-POM/BMO heterojunctions exhibited remarkable photo-Fenton degradation perfor-mance at a wide pH range of 3.0-11.0. Based on the density functional theory calculations and intermediates analysis, the probable degradation pathways of TC were unraveled. In addition, the QSAR prediction and the Microtox test (Photobacterium phoshoreum T3 spp. as the luminescent bacteria) proved that the degradation process of tetracycline could effectively alleviate the ecotoxicity. According to the findings, the application of Fe-POM/BMO in the photo-Fenton degradation process of antibiotics is eco-friendly and exhibits high application potential in environmental remediation.