Voltammetric analysis of As(III) at a cobalt nanoparticles/reduced graphene oxide modified exfoliated graphite electrode

A. Jimana, M. G. Peleyeju, L. Tshwenya, K. Pillay, O. A. Arotiba

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

This work presents the detection and quantification of As(III) at an exfoliated graphite electrode (EG) modified with a composite of cobalt nanoparticles and reduced graphene oxide. The materials were characterised by Raman spectroscopy and scanning electron microscopy & energy dispersive spectroscopy. Modification of the surface of EG with the composite material led to significant improvement in its electro-active surface area and thus electrocatalytic activity. The sensor was utilised for the voltammetric analysis of As(III) in standard and real samples and the limit of detection and limit of quantification were found to be 0.31 and 1.01 ppb respectively, under optimum conditions. The proposed device can be employed for practical analytical purposes.

Original languageEnglish
Pages (from-to)10127-10140
Number of pages14
JournalInternational Journal of Electrochemical Science
Volume13
Issue number11
DOIs
Publication statusPublished - 1 Nov 2018

Keywords

  • Arsenic
  • Cobalt nanoparticles
  • Exfoliated graphite electrode
  • Reduced graphene oxide
  • Voltammetric detection

ASJC Scopus subject areas

  • Electrochemistry

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