Plasma-chemical and photo-catalytic degradation of methyl orange
by Baghdad Benstaali; Nader Al-Bastaki; Ahmed Addou; Jean Louis Brisset
International Journal of Environment and Waste Management (IJEWM), Vol. 11, No. 2, 2013

Abstract: Non-thermal atmospheric humid air plasma is used to investigate chemical reactions mechanisms of predominantly produced neutral hydroxyl radicals by gliding arc discharges with Methyl Orange (MO). UV/visible spectroscopy and electrochemical measurements were performed. Treated solutions show that highly reactive HO^• radicals interaction favours the creation of intermediate species followed by their degradation leading to one aromatic ring end product. Photocatalytic (UV/TiO₂ and UV/H₂O₂) treatments lead to the complete decolourisation of MO within few minutes. The results obtained may confirm that the final product of air plasma MO interaction contains NO₂ and NH₂ groups, the consequence of ^•NO presence in plasma.

Online publication date: Sat, 20-Sep-2014

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