Photoelectrocatalytic degradation of pharmaceuticals and inactivation of viruses in water with tungsten oxide electrodes

Alvaro Tolosana, Natalia Pichel, Helen Lubarsky, John Byrne, A P Fernandez-Ibanez

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Abstract

Electrochemically assisted photocatalysis (EAP) is one approach to overcome the fast recombination rates in photocatalysis and increase the quantum efficiency to produce ROS. In comparison to TiO2, tungsten trioxide (WO3) can utilize UV and visible photons and with EAP the external bias can be used to drive the reduction pathway. In this work WO3 electrodes were prepared hydrothermally on FTO. Vertically grown WO3 nanoplate-like structures were thoroughly characterized. The WO3 photoanodes improved photocurrent response compared to P25 and a visible response was measured. These results were attributed to smaller charge transfer resistance and their morphology. The activity of the photoanodes was assessed on the EAP degradation of sulfamethoxazole and MS2 bacteriophage. WO3 yielded ten times higher degradation rates for sulfamethoxazole (2.21 · 10−6 mmol cm−2 min−1) compared to P25. WO3 also yielded the fastest MS2 inactivation rate. A rapid 5-log removal was achieved in 6 min with WO3 that maintained activity over 5 cycles.
Original languageEnglish
Article number107955
Number of pages12
JournalJournal of Environmental Chemical Engineering
Volume10
Issue number3
Early online date24 May 2022
DOIs
Publication statusE-pub ahead of print - 24 May 2022

Bibliographical note

The authors wish to thank the EU-India H2020 cooperation program for funding this work under the PANIWATER Project (RIA GA-820718) and GCRF UKRI for funding SAFEWATER (EP/P032427/1).

Keywords

  • Photoelectrocatalysis
  • Contaminant of emerging concern
  • Bacteriophage
  • WO3
  • Photoanode
  • Water disinfection

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