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Removal of carbamazepine from urban wastewater by sulfate radical oxidation

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Abstract

The occurrence of bioactive trace pollutants such as pharmaceuticals in natural waters is an emerging issue. Numerous pharmaceuticals are not completely removed in conventional wastewater treatment plants. Advanced oxidation processes may represent an interesting alternative to completely mineralize organic trace pollutants. In this article, we show that sulfate radicals generated from peroxymonosulfate/CoII are more efficient than hydroxyl radicals generated from the Fenton’s reagent (H2O2/FeII) for the degradation of the pharmaceutical compound, carbamazepine. The second-order rate constant for the reaction of SO4 ·− with carbamazepine is 1.92·109 M−1 s−1. In laboratory grade water and in real urban wastewater, SO4 ·− yielded a faster degradation of carbamazepine compared to HO· . Under strongly oxidizing conditions, a nearly complete mineralization of carbamazepine was achieved, while under mildly oxidizing conditions, several intermediates were identified by LC–MS. These results show for the first time in real urban wastewater that sulfate radicals are more selective than hydroxyl radicals for the oxidation of an organic pollutant and may represent an interesting alternative in advanced oxidation processes.

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Authors and Affiliations

  1. Laboratoire Chimie Provence (UMR6264), Aix-Marseille Université, 3 Place Victor Hugo, 13331, Marseille, France

    Roger Matta, Sabrine Tlili, Serge Chiron & Stéphane Barbati

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  1. Roger Matta
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  2. Sabrine Tlili
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  3. Serge Chiron
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  4. Stéphane Barbati
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Correspondence to Stéphane Barbati.

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Matta, R., Tlili, S., Chiron, S. et al. Removal of carbamazepine from urban wastewater by sulfate radical oxidation. Environ Chem Lett 9, 347–353 (2011). https://doi.org/10.1007/s10311-010-0285-z

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  • DOI: https://doi.org/10.1007/s10311-010-0285-z

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