%0 Journal Article %T Influence of hydroxybenzoic acids on the adsorption of Eu(III) onto $\alpha$,$\gamma$-Al$_2$O$_3$ particles in mildly acidic conditions: a macroscopic and spectroscopic study %+ Laboratoire de développement Analytique Nucléaire Isotopique et Elémentaire (LANIE) %+ Laboratoire d'Electrochimie et de Chimie Analytique (LECA) %A Moreau, Pauline %A Colette-Maatouk, Sonia %A Gareil, Pierre %A Reiller, Pascal E. %Z This work was supported by the RSTB program (RBPCH project) from CEA, and the French Direction Générale de l’Armement (DGA). %< avec comité de lecture %@ 0883-2927 %J Applied Geochemistry %I Elsevier %V 74 %P 13-23 %8 2016-11 %D 2016 %R 10.1016/j.apgeochem.2016.08.013 %K Europium %K alumina %K phenolic acids %K TRLS %K adsorption %Z Chemical Sciences/Inorganic chemistry %Z Sciences of the Universe [physics]/Earth Sciences/Geochemistry %Z Chemical Sciences/Analytical chemistryJournal articles %X The influence of hydroxybenzoic acids (HAH$_n$), namely $p$-hydroxybenzoic acid (4 hydroxybenzoic acid, HPhbH) and protocatechuic acid (3,4-dihydroxybenzoic acid, HProtoH2), on the adsorption of europium(III) onto $\alpha$,$\gamma$ Al$_2$O$_3$ particles is studied as a function of acid concentration. After measuring the adsorption edge of the Eu(III)/ $\alpha$,$\gamma$ Al$_2$O$_3$ binary system, and using the previously studied binary component system Eu(III)/HAH$_n$—Moreau et al. (2015) Inorg. Chim. Acta 432, 81—, and HAH$_n$/ $\alpha$,$\gamma$ Al$_2$O$_3$—Moreau et al. (2013) Colloids Surf. A 435, 97—, it is evidenced that HPhbH does not enhance Eu(III) adsorption onto $\alpha$,$\gamma$ Al$_2$O$_3$ in the Eu(III)/HPhbH/ $\alpha$,$\gamma$ Al$_2$O$_3$ ternary system. Conversely, HProtoH$_2$ enhances Eu(III) adsorption onto $\alpha$,$\gamma$ Al$_2$O$_3$ in the Eu(III)/HProtoH$_2$/ $\alpha$,$\gamma$ Al$_2$O$_3$ ternary system. Adsorption of the acids are also found higher in the Eu(III)/acid/ $\alpha$,$\gamma$ Al$_2$O$_3$ ternary systems as compared with the corresponding binary systems assessing synergetic effects. For high HPhbH concentrations a ternary surface species involving $\equiv$AlOH surface sites, Eu(III), and PhbH$^–$ is evidenced by time-resolved luminescence spectroscopy (TRLS). However, in the Eu(III)/HProtoH$_2$/ $\alpha$,$\gamma$ Al$_2$O$_3$ ternary system, chemical environment of Eu(III) is found to be very close to that in the Eu(III)/HProtoH2 binary system. Ternary surface species could not be evidenced in the Eu(III)/HProtoH$_2$/ $\alpha$,$\gamma$ Al$_2$O$_3$ ternary system with TRLS because of the very short decay time of Eu(III) in the presence of protocatechuic acid. %G English %2 https://cea.hal.science/cea-01375382/document %2 https://cea.hal.science/cea-01375382/file/20160728_Ternaires_testweb.pdf %L cea-01375382 %U https://cea.hal.science/cea-01375382 %~ CEA %~ UPMC %~ ENSCP %~ CNRS %~ ENSC-PARIS %~ PARISTECH %~ DEN %~ CEA-UPSAY %~ PSL %~ UNIV-PARIS-SACLAY %~ CEA-UPSAY-SACLAY %~ DEN-SACLAY %~ SORBONNE-UNIVERSITE %~ ENSCP-PSL %~ SU-TI %~ GS-ENGINEERING %~ GS-CHIMIE %~ ALLIANCE-SU %~ TEST3-HALCNRS