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

  • Benjamin O. Orimolade
  • Omotayo A. ArotibaEmail author
Originak Research
  • 14 Downloads

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.

Graphical Abstract

Comparison of different degradation processes for the removal of dye in water on an exfoliated graphite-BiVO4 photoanode.

Keywords

Bismuth vanadate Photoelectrochemical degradation Acid orange 7 dye Exfoliated graphite 

Notes

Funding information

Financial supports were received from the following institutions in South Africa: Faculty of Science, University of Johannesburg; Global Excellence and Stature (GES) doctoral support, University of Johannesburg; Centre for Nanomaterials Science Research, University of Johannesburg; National Research Foundation (CPRR Grant number: 98887 and 118546); and Water Research Commission (Grant Number: K5/2567).

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Applied ChemistryUniversity of JohannesburgJohannesburgSouth Africa
  2. 2.Centre for Nanomaterials Science ResearchUniversity of JohannesburgJohannesburgSouth Africa

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