Enhanced discolouration of methyl violet 10B in a gliding arc plasma reactor by the maghemite nanoparticles used as heterogeneous catalyst. Issue 2 (June 2015)

• Record Type: Journal Article
• Authors: Tiya-Djowe, Antoine; Acayanka, Elie; Lontio-Nkouongfo, G.; Laminsi, Samuel; Gaigneaux, Eric M.
• Is Part Of: Journal of environmental chemical engineering. Volume 3:Issue 2(2015:Jun.)
• Page Start: 953
• Page End: 960
• Publication Date: 2015-06
• Subjects: Gliding arc plasma -- Methyl violet 10B -- Maghemite -- Fenton-like catalyst -- Dye bleaching; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2014.11.016
• Languages: English
• ISSNs: 2213-2929

Abstract

Graphical abstract: Abstract: This study focuses on the discolouration of a triphenylmethane dye (i.e. methyl violet 10B) using a gliding arc plasma discharge in humid air. The results show that the discolouration process is strongly dependent on the initial dye concentration. The maximum discolouration rates are 96.9% and 6.7% after 60 min for initial dye concentrations of 2.5 mg L −1 and 100 mg L −1, respectively. The incorporation of maghemite (γ-Fe2 O3 ) into a 100 mg L −1 dye solution increases the discolouration rate under plasma up to 55.6%. This improvement of the discolouration efficiency suggests that maghemite acts as a heterogeneous catalyst for Fenton decomposition of H2 O2 resulting from the dimerization of HO radicals produced by plasma in the gas phase. The X-ray diffraction (XRD) and Fourier transform-infrared (FTIR) characterizations of the catalyst before and after being used 3-times show that the maghemite nanoparticles are stable in the target-solution exposed to gliding arc plasma and can be therefore reused for further treatments.