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17β-estradiol degradation photoinduced by iron complex, clay and iron oxide minerals: effect of the iron complexing agent ethylenediamine-N,N'-disuccinic acid

Abstract : In this study the photodegradation of the 17β-estradiol (E2), an endocrine-disrupting chemicals (EDCs), is investigated in the presence of iron complex, clay and iron oxide minerals. The impact of one iron complexing agent ethylenediamine-N,N'-disuccinic acid (EDDS) in such systems is also investigated . After the determination of the physicochemical properties of Fe(III)-EDDS complex, the quantum yields of *OH formation and of E2 degradation are evaluated as a function of different parameters (pH, [O2], [Fe(III)-EDDS], [Fe(III)]). For the first time, the quantum yields of *OH production are measured via photolysis of Fe(III)-EDDS with terephthalic acid as probe. In a second part of the work, the adsorption and photocatalytic degradation processes of E2 in the suspensions of Montmorillonite KSF, Natural Montmorillonite (NM) and Goethite are studied. The adsorption of E2 on the minerals is fast and weak. The E2 photodegradation rate is influenced by the concentration of minerals and pH. The photocatalytic degradation process of E2 in the suspensions of Montmorillonite KSF, Natural Montmorillonite and Goethite in the presence of EDDS are studied. In these three minerals-EDDS suspensions, the photodegradation of E2 significantly increases at near-neutral pH and basic pH (pH 5.0 to 9.0). On the contrary, without EDDS, the optimal pH is limited in the acid pH (3.0 to 4.0). The degradation kinetics of E2 follows the Langmuir-Hinshelwood rate law in all the three minerals-EDDS system. Based on the above results, EDDS-Fe(III)/mineral systems are effective photocatalysis system for the removal of the organic pollutants from water.
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  • HAL Id : tel-00719247, version 1

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Jing Li. 17β-estradiol degradation photoinduced by iron complex, clay and iron oxide minerals: effect of the iron complexing agent ethylenediamine-N,N'-disuccinic acid. Chimie analytique. Université Blaise Pascal - Clermont-Ferrand II; Université de Wuhan, 2010. Français. ⟨NNT : 2010CLF22030⟩. ⟨tel-00719247⟩

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