African Journal of
Pure and Applied Chemistry

  • Abbreviation: Afr. J. Pure Appl. Chem.
  • Language: English
  • ISSN: 1996-0840
  • DOI: 10.5897/AJPAC
  • Start Year: 2007
  • Published Articles: 332

Full Length Research Paper

Photocatalytic activity of nanopolyaniline (NPA) on phenol degradation

Tesfa Oluma Fufa
  • Tesfa Oluma Fufa
  • Chemistry Department, Haramaya University Post Box: 138, Dire Dawa, Ethiopia.
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Abi Tadesse Mengesha
  • Abi Tadesse Mengesha
  • Chemistry Department, Haramaya University Post Box: 138, Dire Dawa, Ethiopia.
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Om Prakash Yadav
  • Om Prakash Yadav
  • Chemistry Department, Haramaya University Post Box: 138, Dire Dawa, Ethiopia.
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  •  Received: 30 April 2016
  •  Accepted: 15 July 2016
  •  Published: 31 July 2016

Abstract

Nanopolyaniline (NPA) has been synthesized by chemical oxidative polymerization of aniline and characterized using Fourier transmission infrared (FTIR), X-ray diffraction (XRD) and ultra-violet visible techniques. XRD patterns confirm that NPA has crystallite size of 37 nm with monoclinic structure and UV-visible spectra indicate its band gap energy is 1.96 electron volts. Photocatalytic efficiency of as-synthesized NPA was studied using degradation of phenol as a probe. Effects of photocatalyst load, pH and phenol initial concentration on the degradation of phenol were investigated. Using phenol initial concentration (50 mg L-1) and optimum photocatalyst load (200 mgL-1) and pH 10, degradation of phenol at 3 h was 93.5%. Degradation of phenol follows first order kinetics with rate constant (k) 1.62×10-2 min-1.

Key words: Degradation, photocatalytic efficiency, polyaniline, phenol, X-ray diffraction (XRD).