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Etude des interactions entre Eu(III) et des particules d'alumine en présence d'acides phénoliques

Pauline Moreau 1
1 LANIE - Laboratoire de développement Analytique Nucléaire Isotopique et Elémentaire
SEARS - Service d'études analytiques et de réactivité des surfaces : DEN/DPC
Abstract : In the framework of environmental pollution by radionuclides, this work was focused on the interactions occurring in systems containing europium(III) - as a chemical analogue for the actinides Am(III) and Cm(III) -, phenolic acids - lignin degradation products and antifungi, naturally occurring in soils -, and alumina -representative of sorption sites found in the environment. This study was conducted at different scales of description: the macroscopic scale - to quantify Eu(III) and/or phenolic acids adsorption onto the mineral surface -, and the microscopic scale - to study the chemical environment of Eu(III) using Time-Resolved Luminescence Spectroscopy (TRLS). First, the binary systems, i.e. systems containing only two entities among the three previously cited, were characterized. Complexation constants of Eu(III) by three phenolic acids (4-hydroxybenzoic, 3,4-dihydroxybenzoic, and 3,4,5-trihydroxybenzoic acids) were determined and quantum calculations (DFT) were carried out on La(III)-acid complex analogues. Sorption of the acids onto aluminol sites was modelled using surface complexation concepts. Analyses of two ternary systems (containing 4-hydroxybenzoic and 3,4-dihydroxybenzoic acids) revealed synergistic processes for Eu(III) and phenolic acids sorptions onto Al2O3. A spectral fingerprint of ternary complex involving Eu(III)/4-hydroxybenzoic acid/Al2O3 surface sites was evidenced.
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Submitted on : Monday, February 18, 2013 - 11:54:09 AM
Last modification on : Thursday, December 10, 2020 - 10:57:43 AM
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  • HAL Id : tel-00789479, version 1


Pauline Moreau. Etude des interactions entre Eu(III) et des particules d'alumine en présence d'acides phénoliques. Chimie analytique. Université Pierre et Marie Curie - Paris VI, 2012. Français. ⟨tel-00789479⟩



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