The application of FTO-Cu2O/Ag3PO4 heterojunction in the photoelectrochemical degradation of emerging pharmaceutical pollutant under visible light irradiation

Babatunde A. Koiki, Benjamin O. Orimolade, Busisiwe N. Zwane, Oluchi V. Nkwachukwu, Charles Muzenda, Duduzile Nkosi, Omotayo A. Arotiba

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

We report the photoelectrochemical application of a visible light active FTO-Cu2O/Ag3PO4 photoanode for the abatement of sulfamethoxazole in water. The as-synthesised photoanodes were characterised using XRD, field emission SEM, EDX, diffuse reflectance UV–vis, impedance spectroscopy and chronoamperometry. The results obtained confirmed a successful formation of p-n heterojunction at the Cu2O/Ag3PO4 interface. The highest photocurrent response of 0.62 mAcm−2 was obtained for the composite photoanode which was four times higher than pure Cu2O and about three times higher than pristine Ag3PO4. The photoanode gave 67% removal efficiency within 2 h upon its photoelectrochemical application in the degradation of sulfamethoxazole with 1.5 V bias potential at pH 6.2. The FTO-Cu2O/Ag3PO4 electrode was also applied in the treatment of a cocktail of synthetic organics containing sulfamethoxazole and orange II dye. The photogenerated holes was found to be the major oxidant and the photoanodes was stable and reusable.

Original languageEnglish
Article number129231
JournalChemosphere
Volume266
DOIs
Publication statusPublished - Mar 2021

Keywords

  • Photoanode
  • Photoelectrochemical degradation
  • Silver phosphate
  • Sulfamethoxazole
  • copper(I) oxide
  • p-n heterojunctions

ASJC Scopus subject areas

  • Environmental Engineering
  • General Chemistry
  • Environmental Chemistry
  • Pollution
  • Public Health, Environmental and Occupational Health
  • Health, Toxicology and Mutagenesis

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