Breakthrough in Nanotechnology: Cobalt-Modified MOF for Efficient Photocatalytic Wastewater Treatment

Researchers at South China Normal University have made a significant breakthrough in the field of nanotechnology, developing a novel cobalt-modified metal-organic framework (MOF) for effective photocatalytic wastewater treatment. This innovative material, dubbed UiO-bpydc(Co), has shown exceptional efficiency in degrading refractory fluoroquinolone antibiotics, with a degradation rate of 95.8% within 30 minutes in the presence of peroxymonosulfate. The study highlights the potential of transition metal doping to alter the electronic structure of MOFs for target-specific catalytic reactions, offering new opportunities for advanced environmental remediation technologies.

Key Takeaways:

• The UiO-bpydc(Co) MOF exhibits superior visible-light-driven photocatalysis via peroxymonosulfate (PMS) bridged ligand-to-metal charge transfer (LMCT), enabling efficient degradation of refractory fluoroquinolone antibiotics.
• The cobalt modification allows for narrowed bandgap (2.82 eV), improved charge transfer via Co centers, and increased pollutant affinity due to electron-rich ligand, resulting in enhanced photocatalytic activity.
• The generation of long-lifespan singlet oxygen (O, 41.8%) is identified as the key reactive species in the degradation process.
• Theoretical calculations indicate that the formation of a -Co-OOSO bridge reduces the HOMO-LUMO gap, promoting carrier separation and improving pollutant-catalyst interactions.
• The UiO-bpydc(Co) MOF demonstrates exceptional stability, recyclability, and broad pollutant applicability, making it a promising candidate for utilization in oxidative environments.
• This research highlights the potential of transition metal doping to alter the electronic structure of MOFs for target-specific catalytic reactions, offering new opportunities for advanced environmental remediation technologies.

Statistics:

• 95.8% degradation of lomefloxacin (LOM) within 30 minutes in the presence of PMS
• 41.8% generation of long-lifespan singlet oxygen (O)
• 2.82 eV narrowed bandgap in the UiO-bpydc(Co) MOF
• 30 minutes degradation time for refractory fluoroquinolone antibiotics

Sources:

• Cobalt-modification on UiO-bpydc MOF facilitates ligand-to-metal charge transfer for superior visible-light photocatalytic degradation of refractory fluoroquinolone antibiotics. Environmental Research, 2025;279:121789.
• NewsRx. South China Normal University Reports Findings in Photocatalytics (Cobalt-modification on UiO-bpydc MOF facilitates ligand-to-metal charge transfer for superior visible-light photocatalytic degradation of refractory fluoroquinolone antibiotics). Nanotechnology Weekly. June 16, 2025; p 3798.