Sulphate radical enhanced photoelectrochemical degradation of sulfamethoxazole on a fluorine doped tin oxide - copper(I) oxide photoanode

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

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

We report a sulphate radical enhanced photoelectrochemical degradation of sulfamethoxazole on a solar light driven fluorine doped tin oxide - copper(I) oxide photoanode. Copper(I) oxide was prepared by a template-free method and dispersed onto the surface of a fluorine doped tin oxide glass to form the photoanode. UV–Vis diffuse reflectance spectroscopy showed that the photoanode absorbed in the visible light region. With sodium persulphate as the source of sulphate radical, photoelectrochemical degradation studies showed that sodium persulphate markedly enhanced the degradation of sulfamethoxazole. Studies on the effects of change in concentration of the persulphate and the absence of the persulphate on the photoelectrocatalytic degradation process were conducted. Overall, the extent of degradation and mineralisation of sulfamethoxazole in water was found to be 86% and 67% respectively with bias potential of 1.5 V for the sulphate radical enhanced process. Scavenger studies showed that the photogenerated holes and sulphate radicals were the primary active species in the abatement of sulfamethoxazole. The effectiveness of sulfamethoxazole removal in real matrices by the use of FTO-Cu2O photoanode and sulphate radical was also confirmed.

Original languageEnglish
Article number115714
JournalJournal of Electroanalytical Chemistry
Volume900
DOIs
Publication statusPublished - 1 Nov 2021

Keywords

  • Copper(I) oxide
  • Persulphate
  • Photoelectrochemical degradation
  • Sulfamethoxazole
  • Sulphate radical

ASJC Scopus subject areas

  • Analytical Chemistry
  • General Chemical Engineering
  • Electrochemistry

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