Résumé:
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.
