Plasma-chemical and photo-catalytic degradation of methyl orange
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Date
Journal Title
Journal ISSN
Volume Title
Publisher
International Journal of Environment and Waste Management
Abstract
Non-thermal atmospheric humid air
plasma is used to investigate
chemical reactions mechanisms of pr
edominantly 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/TiO
2
and UV/H
2
O
2
) treatments lead to
the complete decolourisation of MO w
ithin few minutes. The results obtained
may confirm that the final product of ai
r plasma MO interaction contains NO
2
and NH
2
groups, the consequence of
•
NO presence in plasma.