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Mechanism of photochemical degradation of Fe(III)-EDDS complex

Abstract : In this work, we investigated the photochemical degradation of the complex Fe(III)-EDDS which is increasingly used in studies of advanced oxidation processes. After irradiation of the aqueous solution, HPLC-HRMS analyses are used to identify the degradation products of EDDS. Six different products are separated and identified with specific chemical formulas. Proposed mechanisms based on the initial photo-redox process can explain the formation of all the products. They correspond to oxidized products with a shorter carbon chain and aldehyde and/or carboxylic acid functions. Among, them the formation of formaldehyde is also proposed in the mechanisms. This study is the first one that identifies degradation products of Fe(III)-EDDS complex and proposes a complete mechanism of degradation that can be applied for other iron complexes.
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Submitted on : Thursday, June 4, 2020 - 11:11:32 AM
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S. Jaber, M. Leremboure, V. Théry, A.-M. Delort, G. Mailhot. Mechanism of photochemical degradation of Fe(III)-EDDS complex. Journal of Photochemistry and Photobiology A: Chemistry, Elsevier, 2020, 399, pp.112646. ⟨10.1016/j.jphotochem.2020.112646⟩. ⟨hal-02769495⟩



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