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Zirconium-based Metal-Organic Frameworks for highly efficient solar light-driven photoelectrocatalytic disinfection

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  • Laura Valenzuela, University of Alcalá
  • ,
  • Georgiana Amariei
  • Chizoba I. Ezugwu, University of Alcalá
  • ,
  • Marisol Faraldos, CSIC - Institute of Catalysis and Petrochemistry
  • ,
  • Ana Bahamonde, CSIC - Institute of Catalysis and Petrochemistry
  • ,
  • Marta E.G. Mosquera, University of Alcalá
  • ,
  • Roberto Rosal, University of Alcalá

Two synthesized zirconium-based Metal-Organic Frameworks (Zr-MOFs), using 2,6-naphthalenedicarboxylic acid (NDC) and amino-functionalized NDC (4,8-diaminonaphthalene-2,6-dicarboxylic acid, NDC-2NH2) as linkers, have been studied in photoelectrocatalytic disinfection processes. The Zr-based MOFs were deposited onto graphite paper and were deeply analysed to unravel their behaviour in electrocatalytic (EC), photocatalytic (PC) and photoelectrocatalytic (PEC) configurations under solar (Xe-arc lamp), visible (Xe-arc lamp + 400 nm cut-off filter) and 365 nm UV-LED irradiation. TPC results showed reproducible photocurrent response upon repeated on–off cycles and bandgaps were calculated to be 3.13 and 2.11 eV for Zr-NDC and Zr-NDC-2NH2, respectively. The highest photocurrent was obtained for 365 nm UVA in Zr-NDC and was similar for both UVA and solar irradiation in the case of Zr-NDC-2NH2. The Zr-MOFs catalytic electrodes were evaluated for their disinfection activity using a strain of Staphylococcus aureus and performance tracked by measuring colony forming units (CFU). The disinfection efficiency was higher in PEC than PC studies (>2-log reduction or 99 % CFU inhibition) under 365 nm UVA irradiation, suggesting that the anodic bias potential effectively minimized the recombination of the photogenerated electron-hole pairs. A complete disinfection was reached after 60 and 20 min under irradiation of full Xe-arc (solar) spectrum in PC and PEC runs, respectively, for both Zr-MOFs. The high disinfection capacity under solar irradiation was attributed to the transfer of photoexcited electrons from ligand to cluster by high energy photons.

Original languageEnglish
Article number120351
JournalSeparation and Purification Technology
Number of pages9
Publication statusPublished - Mar 2022

    Research areas

  • Disinfection, Metal-organic framework, Photoelectrocatalysis, Solar light, Zirconium

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