Photodegradation of estrone enhanced by dissolved organic matter under simulated sunlight |
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Authors: | Caupos Emilie Mazellier Patrick Croue Jean-Philippe |
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Affiliation: | a Université de Poitiers, CNRS - UMR 6008, Laboratoire de Chimie et Microbiologie de l’Eau, ENSIP, Poitiers, France b Université de Bordeaux, CNRS, UB1, UB4, UMR 5805, EPOC-Laboratoire de Physico et Toxico Chimie de l’Environnement, France c King Abdullah University of Science and Technology (KAUST), Water Desalination and Reuse Center, Saudi Arabia |
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Abstract: | In the present work the degradation of estrone (E1) a natural estrogenic hormone has been studied under simulated solar irradiation. The photodegradation of E1 has been investigated in the absence and in the presence of 7.7-8.9 mg L−1 of dissolved organic carbon (DOC), under solar light simulation with irradiance approximating that of the sun. DOC extracts from different origins have been used. Half-lives ranging between 3.9 h and 7.9 h were observed. Results indicated that E1 was photodegraded even in the absence of DOC. The presence of DOC was found to enhance the degradation of E1. Experiments performed with the addition of reactive species scavengers (azide ions and 2-propanol) have shown that these two species play a significant role in the photodegradation. Some experiments have been performed with a DOC previously submitted to solar irradiation. Changes in optical and physico-chemical properties of DOC strongly affect its photoinductive properties, and hence its efficiency on E1 degradation. A part of the study consisted in the investigation of photoproducts structures. Five photoproducts were shown by chromatographic analysis: one arising from direct photolysis and the four others from DOC photoinduced degradation. |
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Keywords: | Photodegradation Estrone Dissolved organic carbon - DOC Photoproducts Sunlight |
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