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Activation of persulfate by homogeneous and heterogeneous iron catalyst to degrade chlortetracycline in aqueous solution.

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Pulicharla, Rama; Drouinaud, Roggy; Brar, Satinder Kaur; Drogui, Patrick; Proulx, François; Verma, Mausam P.; Surampalli, Rao Y. (2018). Activation of persulfate by homogeneous and heterogeneous iron catalyst to degrade chlortetracycline in aqueous solution. Chemosphere , vol. 207 . p. 543-551. DOI: 10.1016/j.chemosphere.2018.05.134.

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Résumé

This study investigates the removal of chlortetracycline (CTC) antibiotic using sulfate radical-based oxidation process. Sodium persulfate (PS) was used as a source to generate sulfate radicals by homogeneous (Fe²⁺) and heterogeneous (zero valent iron, ZVI) iron as a catalyst. Increased EDTA concentration was used to break the CTC-Fe metal complexes during CTC estimation. The influence of various parameters, such as PS concentration, iron (Fe²⁺ and ZVI) concentration, PS/iron molar ratio, and pH were studied and optimum conditions were reported. CTC removal was increased with increasing concentration of PS and iron at an equal molar ratio of PS/Fe²⁺ and PS/ZVI processes. PS/Fe²⁺ and PS/ZVI oxidation processes at 1:2 (500 μM PS and 1000 μM) molar ratio showed 76% and 94% of 1 μM CTC removal in 2 h. Further increased molar ratio 1:2 onwards, PS/Fe²⁺ process showed a slight increase in CTC degradation whereas in PS/ZVI process showed similar degradation to 1:2 (PS/Fe) ratio at constant PS 500 μM concentration. Slower activation of persulfate which indirectly indicates the slower generation of sulfate radicals in PS/ZVI process showed higher degradation efficiency of CTC. The detected transformation products and their estrogenicity results stated that sulfate radicals seem to be efficient in forming stable and non-toxic end products.

Type de document: Article
Mots-clés libres: chlortetracycline; iron; metal complexation; sulfate radicals; homogeneous catalyst; heterogeneous catalyst
Centre: Centre Eau Terre Environnement
Date de dépôt: 08 juin 2018 19:55
Dernière modification: 08 juin 2018 19:55
URI: http://espace.inrs.ca/id/eprint/7275

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