An S-Scheme CeO2/Bi2O2S heterojunction photoanode for the photoelectrocatalytic degradation of sulfamethoxazole in synthetic and real wastewater

Kehinde D. Jayeola, Dimpo S. Sipuka, Tsholofelo I. Sebokolodi, Oluchi V. Nkwachukwu, Charles Muzenda, Babatunde A. Koiki, Jonathan O. Babalola, Minghua Zhou, Omotayo A. Arotiba

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We prepared an S- scheme heterojunction photoanode using cerium oxide (CeO2) and bismuth oxysulfide (Bi2O2S) for the photoelectrocatalytic degradation of sulfamethoxazole. The CeO2 /Bi2O2S photoanode was synthesised via an in-situ hydrothermal method, ensuring strong contact and efficient charge transfer between the CeO2 and Bi2O2S. The materials and photoanode were characterized with XRD, XPS, photoluminescence, and photoelectrochemistry. The S-scheme configuration observed in the formation of heterojunction in CeO2 /Bi2O2S photoanode was responsible for the improved photoelectrocatalytic performance for the visible light-assisted degradation of sulfamethoxazole. Operational parameters such as the effect of pH and current density were examined. The extent of sulfamethoxazole mineralisation was calculated to be 72 % using the total organic carbon (TOC) measurement. The LC-MS analysis was used to predict the degradation pathway and products. Furthermore, the photoelectrocatalytic efficiency of the CeO2/Bi2O2S photoanode was investigated in real wastewater matrices with TOC removal of 54 %. Therefore, the S scheme CeO2/Bi2O2S photoanodes lends itself to photoelectrochemical water treatment applications.

Original languageEnglish
Article number145160
JournalElectrochimica Acta
Volume507
DOIs
Publication statusPublished - 10 Dec 2024

Keywords

  • Bismuth oxysulfide
  • Cerium oxide
  • Photoelectrocatalytic degradation
  • S-scheme heterojunction
  • Sulfamethoxazole

ASJC Scopus subject areas

  • General Chemical Engineering
  • Electrochemistry

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