J. Phys. IV France 107 (2003) 1185
A nex immobilized hydroxypyridinone as a sequestering agent for heavy metal ionsM.A. Santos and R. Grazina
Centro de Quimica Estrutural, Cornplexo I, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
New chelating solid matrices were developed for the removal of hard heavy metal ions (ex: Fe 3+, Al 3+. Pu 4+) from water solutions. They are based on the immobilization of 3-hydroxy-4-pyridinone (HP) amino-derivatives by covalent binding to epoxy-activated Sepharose gels, through amine linkages. These HP-functionalized gels are able to strongly chelate those metal ions though formation of 1:1 (metal: HP) complexes. They possess a much higher stability and capacity for sequestering this type of metal ions and in a wider range of pH than the corresponding analogous gels, which involve the CNBr-activated sepharose and have amide/isoureia bonds as the ligand-matrix points of attachment.
© EDP Sciences 2003