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Enhanced Tetracycline Degradation via Periodate Activation by Fe/Mn Bimetallic MOFs: Synergy of Electron Transfer and Active Oxidation Species
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DOI：10.1016/j.colsurfa.2026.141485.png)
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Abstract
En 中文
The residual of tetracycline (TC) in water bodies is threats to both ecosystems and human health. Herein, Mn, Co, Cu and Zn as the second metal were introduced into MIL-101(Fe) to form bimetallic metal-organic frameworks (MOFs) for periodate (PI) activation toward TC degradation. The Fe/Mn-MOFs/PI system achieves 97.8% TC removal within 15 min, with a pseudo-first-order rate constant of 0.0623 min-1, demonstrating superior catalytic performance compared to other bimetallic MOFs. The introduction of Mn increased the pore volume and specific surface area of the material and enhanced the electronic synergy between Fe and Mn. Mechanistic studies combining quenching experiments, electron spin resonance analysis and sulfoxide probe transformation indicated the involvement of active oxidation species, including IO3·, 1O2, ·OH and O2·-. These active oxidation species and interfacial electron transfer synergistically promoted TC degradation. Intermediate products are analyzed, and five possible TC degradation pathways are proposed. The progressive reduction in the predicted toxicity of the products suggests a lower predicted biological risk during TC transformation. Furthermore, the Fe/Mn-MOFs/PI system retains high catalytic activity under near-neutral conditions and in complex water matrices. This study suggests that Mn incorporation enhances Fe-MOFs-mediated PI activation by increasing the specific surface area and pore volume, promoting Fe/Mn redox cycling, and accelerating interfacial electron transfer, thereby providing a mechanistic basis for designing bimetallic Fe-MOFs catalysts for antibiotic-contaminated water treatment.
Keywords:
Periodate
Advanced oxidation processes
Antibiotic degradation
Bimetallic MOFs
Journal
C
IF:
5.4
Papers:
153
Citations:
0
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