FERHAT ABBAS UNIVERSITY EVENT PLATEFORM, The third african conference on research in chemistry education

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A new alternative process of degradation of sulfamethoxazole SMX, by conventional Fenton and Fenton assisted by microwave (MW)
Abdellah Bouguettouchaa

Last modified: 2017-10-03

Abstract


Pharmaceuticals products such as SMX are released to the environment in trace amounts (ng/l to mg/l) by humans and animals, at a time in their original form and as metabolites. Antibiotics are contaminants that are hazardous to the aquatic environment due to their adverse effects on aquatic life and humans. They can cause at low concentration a disturbance in the water treatment process and increase the proliferation of antibiotic-resistant pathogens. It is therefore important to develop effective techniques to limit their presence in aquatic environments. Advanced oxidation processes (POA) appear more practical in comparison with other conventional techniques because they are based on the production of hydroxyl radicals OH. The objective of this study was to evaluate the degradation of sulfamethoxazole (SMX) by Fenton process assisted by the microwave (MW/Fe/H202). So concentrations of oxygen peroxide, ferrous ion and microwave power were optimized. The results indicate that the degradation of SMX by MW / Fe / H2O2 obey a pseudo-first order kinetics. The treatment of SMX solutions (20 mg/L) by microwaves in the presence of Fenton's reagents showed that they had a very positive effect on SMX degradation since they gave higher reaction rates and very short time of degradation (is less than 5 min) compared to the conventional Fenton process. The process of SMX degradation was accelerated by increasing the heating power applied, we note also that a cooling between two heaters was respected. The optimum pH of degradation in conventional or MW-assisted Fenton is equal to 3. The study of the effect of the ionic strength of the treated solutions showed that the carbonate and sulfate ions increase the rate of SMX degradation.


Keywords


Microwave, Degradation, Fenton, Antibiotic