Elimination of sulfamethoxazole by anodic oxidation using mixed metal oxide anodes

Yeney Lauzurique, Sara Miralles-Cuevas, Mariel Godoy, Pamela Sepúlveda, Soledad Bollo, Alejandro Cabrera-Reina, César Huiliñir, Sixto Malato, Isabel Oller*, Ricardo Salazar-González

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The degradation of sulfamethoxazole (SMX) was studied by anodic oxidation (AO) process using mixed metal oxide (MMO) electrodes with different Ru/Ir ratios. Each electrode was characterized morphological and electrochemically. The electrolyzes were performed in NaCl and Na2SO4 applying two current densities (10 and 50 mA cm−2). The electrode with the highest composition of Ir, Ru/Ir (30/70), showed greater SMX degradation and generation of oxidizing species and was used to treat the antibiotic by AO and AO assisted by solar energy in natural water and actual municipal wastewater effluents. The efficiency in SMX degradation depends on the type of electrode used (MMO) and electrolytic medium. All MMO electrodes, reached almost total degradation of SMX in chloride medium. However, 60 % degradation of SMX in sulfate medium was achieved with anode with lower Ru/Ir ratio. Additionally, degradation of SMX in complex matrices can be successfully carried out by solar-assisted AO and AO processes, without the need to adjust the pH, at room temperature and using anode with lower Ru/Ir ratio. Finally, the AO process assisted by solar energy reduced electrolysis times and the cell's potential, leading to lower energy consumption.

Original languageEnglish
Article number103922
JournalJournal of Water Process Engineering
Volume54
DOIs
StatePublished - Aug 2023
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2023

Keywords

  • Anodic oxidation
  • Electrodes
  • Ru/Ir ratios
  • Solar energy
  • Sulfamethoxazole

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