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Impact of iron-complex (Fe(iii)–NTA) on photoinduced degradation of 4-chlorophenol in aqueous solution

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Abstract

In this research work, the photochemical impact of Fe(iii)–nitrilotriacetic acid complex (FeNTA) on the fate of an organic pollutant (4-chlorophenol (4-CP)) was investigated in natural waters. The quantum yields of the photodecomposition of the FeNTA complex and of Fe(ii) formation, by an intra-molecular photoredox process (the first stage of the reaction) are high. This photoredox reaction represents the first step of the process leading to 4-CP disappearance. Whereas oxygen does not affect FeNTA photodegradation, 4-CP depletion requires the presence of oxygen. The radical species HO˙ and CO3˙− responsible of the degradation were identified by ESR spectroscopy under irradiation. Two different wavelength-dependent mechanisms of 4-chlorophenol degradation are proposed. It clearly appears that under solar irradiation, iron organic complexes like FeNTA can play a significant role on the fate of the organic compounds present in natural waters.

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Authors and Affiliations

  1. Laboratoire de Photochimie Moléculaire et Macromoléculaire, UMR 6505 CNRS-Université Blaise Pascal, 63177, Aubière Cedex, France

    Otman Abida, Gilles Mailhot & Michèle Bolte

  2. Unidad de Actividad Química, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Av. Gral. Paz 1499, 1650, Buenos Aires, Argentina

    Marta Litter

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  1. Otman Abida
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  2. Gilles Mailhot
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  3. Marta Litter
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  4. Michèle Bolte
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Correspondence to Gilles Mailhot.

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Abida, O., Mailhot, G., Litter, M. et al. Impact of iron-complex (Fe(iii)–NTA) on photoinduced degradation of 4-chlorophenol in aqueous solution. Photochem Photobiol Sci 5, 395–402 (2006). https://doi.org/10.1039/b518211e

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