Photoelectrochemical degradation of eosin yellowish dye on exfoliated graphite–ZnO nanocomposite electrode

B. Ntsendwana, S. Sampath, B. B. Mamba, O. S. Oluwafemi, O. A. Arotiba

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

In the quest for harnessing more power from the sun for water treatment by photoelectrochemical degradation, we prepared a novel photoanode of exfoliated graphite (EG)–ZnO nanocomposite. The nanocomposite was characterised by X-ray diffractometry, energy dispersive spectroscopy, Brunauer–Emmett–Teller surface area analyser, thermal gravimetric analyser, and X-ray photoelectron spectroscopy. The EG–ZnO nanocomposite was fabricated into a photoanode and applied for the photoelectrochemical degradation of 0.1 × 10−4 M eosin yellowish dye in 0.1 M Na2SO4 under visible light irradiation. The degradation was monitored with a visible spectrophotometer. The photoelectrochemical degradation process resulted in enhanced degradation efficiency of ca. 93 % with kinetic rate of 11.0 × 10−3 min−1 over photolysis and electrochemical oxidation processes which exhibited lower degradation efficiencies of 35 and 40 % respectively.

Original languageEnglish
Pages (from-to)592-598
Number of pages7
JournalJournal of Materials Science: Materials in Electronics
Volume27
Issue number1
DOIs
Publication statusPublished - 1 Jan 2016

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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