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Volume 3, Issue 2 (Suppl) Ind Chem
ISSN: 2469-9764, ICO an open access journa Industrial Chemistry 2017
May 22-23, 2017
May 22-23, 2017 Las Vegas, USA
2nd World Conference on
Industrial Chemistry and Water Treatment
Decontamination of polluted water by veterinary antibiotics by studying the photochemical
behavior under light excitation
Soumaya Mezghich1, 2, Fadhila Ayari1, Dalila Ben Hassen Chehimi1 and Mohamed Sarakha2
1University of Carthage, Tunisia
2Blaise Pascal University, France
Nowadays, the emergence of pharmaceuticals in the aquatic and terrestrial environment has been a major concern. They
have been detected in sewage-treatment plants, sediments, and soils, as well as, at surface and drinking water. So far,
there is limited information in the literature on the fate of these compounds when they are exposed to solar light in the
various environmental compartments. The objective of the present study is to investigate the degradation process of two
different antibiotics Sulfamethoxazole (STZ), Hydrochlorothiazide (HCD) in aqueous solutions when exposed to simulated
solar light. We mainly concentrate our effort on the kinetic studies by evaluating the degradation quantum yield, as well as,
the effect of various parameters such as oxygen concentration, pH and the presence of inorganic ions. The main effect was
observed by molecular oxygen parameter. We also make an important effort in the elucidation of the main intermediate and
stable byproducts. A lot of information is available on the stability and fate of parent compounds and not so many on their
transformation products. These may present a toxicity level higher than the precursor substrate and should be identified and
analyzed.The structure elucidation was obtained by using the HPLC/ESI/MS andHPLC/ESI/MS2 techniques in negative, as well
as, positive modes and through the complete study of the various fragmentation pathways. The main involved photochemical
processes were: The scission of the bridge through a photohydrolysis process, selective hydroxylation of the aromatic moiety,
desulfonation process and in the case of HCD to dechloration reaction. A mechanism was then proposed in the light of the
kinetic and analytical studies.
Soumaya Mezghich et al., Ind Chem 2017, 3:2 (Suppl)