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Accueil > Séminaires > Archive des séminaires d’Utinam > Archive des séminaires de chimie (jusqu’en 2011) > 2007

Les macrocycles supportés en chimie séparative : de la physico-chimie en solution au procédé d’épuration

par Edith Burgey -

Vendredi 21 septembre 2007

Michel Meyer

Laboratoire d’Ingénierie Moléculaire pour la Séparation et les Applications des Gaz, Dijon

Résumé :

Exposure to lead-contaminated tap water is a persistent issue in most western countries, which primarily concerns children
and the economically less-favored population. Once ingested through the gastrointestinal track, lead accumulates in vital organs and
bones, and finally causes a number of diseases ranging from anemia to nervous system degeneration. Thus, the 1998 directive
98/83/CE of the Council of the European Communities relating to the quality of consumption water, recommends the national
governments to promulgate an amendment intended to reduce the highest allowed lead concentration in drinking water from 25 to
10 \mu g L^{-1} in 2013.

In that context, we got involved in the design of a cartridge-based purification system that could be mounted directly on a
kitchen faucet. Solid-phase extraction by covalent attachment of a lead-selective sequestering agent to the surface of silica gel was
thought as an efficient method to reduce the lead level in tap water below the new parametric value, as shown by field tests.

High binding affinity and selectivity, especially with respect to alkaline and earth-alkaline cations, and fast uptake kinetics
are of crucial importance. This fine-tuning was most conveniently achieved by taking advantage of the outstanding coordination
properties displayed by N-functionalized tetraazamacrocycles of various sizes bearing amidic side chains Their structural,
thermodynamic, and kinetic characterization will be discussed as well as solid/liquid extraction data.