ABSTRACT: Rare earth elements of high purity are essential in many technical and scientific fields and their recycling is essential to build a circular economy. A widely used method for the separation of lanthanides is ion exchange - cation exchange with elution by complexing agents - In these processes, the order of elution of the different rare earth elements depends on the values of the stability constants of the complexes formed with a solid. More generally, the behavior of ions at aqueous interfaces is crucial in energy research, for example batteries, and environmental science where their distribution is eventually controlled by the composition and structure of the Stern layer. In this work, we have used x-ray standing waves to determine the distribution of lanthanides at the water/silica interface.
I will describe step by step the method we use for measurements and data analysis and present preliminary results. These data have also been compared to molecular dynamics simulations which I will present.
Jean Daillant (1), Florent Malloggi (2), Luc Girard (3), Bertrand Siboulet (3), Kunyu Wang (3), Arnaud Hemmerle (1)
(1) Synchrotron SOLEIL
(2) NIMBE, UMR 3685, CEA Saclay
(3) ICSM - UMR 5257 - Institut de Chimie Séparative de Marcoule, CEA Marcoule
About the speaker: Jean Daillant, born in 1963, is an experimental physicist (soft-condensed matter). He is presently Director General of the SOLEIL Synchrotron, Saint Aubin, France. He was previously the head of Interdisciplinary Laboratory on Supramolecular Nanoscale Organisation (LIONS) within the UMR CNRS 3299 CEA SIS2M from 2004 to 2011 and Deputy Director of LURE (former French synchrotron) from 1999 to 2002.
His work focuses on fluids and soft matter interfaces: membranes and thin films, electrolytes, polymers and copolymers at interfaces, wetting phenomena, using in particular large facilities (synchrotron and neutrons). He has in particular developed grazing incidence x-ray scattering methods using synchrotron radiation and atomic force microscopy to study liquid interfaces. This work has resulted in more than 120 publications, and 15 PhD theses as well as many international collaborations. He has organized several international conferences and schools on these subjects.
He has been vice-chair of the “Physics” panel of the French National Research Agency (2005-2007) and chair of the “Nanoscience and Nanotechnology” panel (2015-2017), vice-chair of Science Advisory Committees of the ESRF (2006-2009) chair of Paul Scherrer Institute Photon Science Advisory Committee (2014-2017), a member of the DESY Science Advisory Committee (2014-2019), and presently the chair of the Helmholtz Zentrum Berlin Scientific Advisory Committee. He is the vice-chair of the League of European Accelerator Based Photon Sources (LEAPS).
LINK: https://uchicago.zoom.us/j/94220080385?pwd=b0VpcUFUOFNDT0pITk5WeTg4YjAwZz09
Meeting ID: 942 2008 0385
Password: 013444