New hydroxypyridinone-functionalized sepharoses as sorbing agents for hard metal ions.
Two new polymeric matrices functionalized with 3-hydroxy-4-pyridinone chelating units (HP-NH-SEPH and HP-C=NH-SEPH) have been prepared and studied for their chelating ability towards a set of metal ions (e.g. Fe(III), Al(III), and Th(IV)). Both matrices demonstrated excellent ability to complex these metal ions, but HP-NH-SEPH evidenced higher chelating capacity than HP-C=NH-SEPH. The corresponding metal-complex gels presented high stability in the pH range 3-7, and their chelating capacity followed the order, Fe(III)≈Th(IV)>Al(III), in agreement with previously reported thermodynamics of the corresponding monomeric ligand-metal complexes in aqueous solution. These functionalized supports also showed capacity to be regenerated and reused. Thus, there are good perspectives for potential environmental and medical applications of these new metal sorbents.
Centro Química Estrutural, Instituto Superior Técnico-UTL, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
Raquel
R
Grazina
M Amelia
MA
Santos
D008671:Actinoid Series Elements / Q000737:chemistry; D000327:Adsorption; D000535:Aluminum / Q000737:chemistry / Q000302:isolation & purification; D002614:Chelating Agents / Q000737:chemistry*; D005782:Gels; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D007501:Iron / Q000737:chemistry / Q000302:isolation & purification; D008024:Ligands; D008670:Metals / Q000302:isolation & purification*; D011728:Pyridones / Q000737:chemistry*; D012685:Sepharose / Q000737:chemistry*; D012996:Solutions; D013910:Thorium / Q000737:chemistry / Q000302:isolation & purification
D008671:Actinoid Series Elements; D002614:Chelating Agents; D005782:Gels; D007202:Indicators and Reagents; D008024:Ligands; D008670:Metals; D011728:Pyridones; D012996:Solutions; D013910:Thorium; D012685:Sepharose; D000535:Aluminum; D007501:Iron