Towards wastewater treatment: Photo-assisted electrochemical degradation of 2-nitrophenol and orange II dye at a tungsten trioxide-exfoliated graphite composite electrode

Eseoghene H. Umukoro, Moses G. Peleyeju, Jane C. Ngila, Omotayo A. Arotiba

Research output: Contribution to journalArticlepeer-review

85 Citations (Scopus)

Abstract

The degradation of organics in water treatment by electrochemical and photo-assisted electrochemical processes was carried out using a photoanode consisting of tungsten trioxide (WO3) and exfoliated graphite (EG). The WO3-EG nanocomposite was characterised using voltammetry, X-ray diffractometry, Raman and FTIR spectroscopy, and scanning electron microscopy connected to energy dispersive X-ray spectrometry. The applicability of the WO3-EG as photoanode material was investigated by the degradation of 2-nitrophenol and orange II dye as model organic pollutants in a 0.1 M Na2SO4solution, using a 10 mA cm−2current density. The removal efficiencies and the extent of mineralisation of the dye and 2-nitrophenol were monitored using a UV–Visible spectrophotometer and a TOC analyser respectively. The results showed that the WO3-EG nanocomposite electrode gave a higher removal efficiency (82% for 2-nitrophenol and 95% for orange II dye) and a higher degree of mineralisation (69% for 2-nitrophenol and 67% for orange II dye) in comparison to the EG electrode. Furthermore, efforts were made to evaluate the degradation intermediates which indicated the formation of carboxylic acids that were further degraded by hydroxyl radicals.

Original languageEnglish
Pages (from-to)290-301
Number of pages12
JournalChemical Engineering Journal
Volume317
DOIs
Publication statusPublished - 2017

Keywords

  • Electrochemical
  • Electrode
  • Exfoliated graphite
  • Photo-assisted
  • Tungsten trioxide

ASJC Scopus subject areas

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering

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