An Exfoliated Graphite-Bismuth Vanadate Composite Photoanode for the Photoelectrochemical Degradation of Acid Orange 7 Dye

Benjamin O. Orimolade, Omotayo A. Arotiba

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

This work investigates the removal of acid orange 7 dye from aqueous solution through photo electrochemical technique using a composite of exfoliated graphite and bismuth vanadate (EG-BiVO4) as photoanode. Monoclinic sheelite BiVO4 nanoparticles were synthesised through the hydrothermal route and subsequently added to prepared EG to form a composite. The EG-BiVO4 composite was fully characterised through XRD, SEM and FTIR. The cyclic voltammograms of the EG-BiVO4 electrodes were obtained in potassium ferricyanide and ferrocyanide redox probe. The XRD result revealed that the BiVO4 has a monoclinic sheelite crystal lattice with particle size of 74.17 nm. The EG-BiVO4 photoanode was applied for the photoelectrochemical degradation of acid orange 7 dye. Concentration decay of the dye was monitored using the UV-Vis spectrophotometer. The photo-assisted process gave improved degradation efficiency of 88% within 90 min. Kinetics study revealed that the process followed the pseudo first-order kinetics and fast with apparent rate constant of 1.60 × 10−2 min−1. The results of this investigation reveal the potential application of BiVO4 photoanode in the photoelectrochemical treatment of dye contaminated water. [Figure not available: see fulltext.].

Original languageEnglish
Pages (from-to)429-435
Number of pages7
JournalElectrocatalysis
Volume10
Issue number4
DOIs
Publication statusPublished - 15 Jul 2019

Keywords

  • Acid orange 7 dye
  • Bismuth vanadate
  • Exfoliated graphite
  • Photoelectrochemical degradation

ASJC Scopus subject areas

  • Electrochemistry

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