Comparative Study on Metal Extraction Properties of Empore SDB‐XC and Amberlite XAD‐4 Grafted by Salicylic Acid and its Derivatives via Different Bridges
Résumé
Among commercially available sorbents, aromatic organic crosslinked copolymers allow to consider numerous ways of linking ligands. In this way, the grafting of salicylic acid and of its derivatives (methylene disalicylic acid and aurintricarboxylic acid) via the ketone, amide and diazo bridges on Amberlite® XAD‐4 resin and Empore™ SDB‐XC membrane have been carried out. The modified sorbents thus obtained have been appraised according to their grafing rate and their efficiency to selectively retain different metallic ions versus pH. The grafting of the sorbents permits to obtain pretty good yields. Extraction yield studies have revealed that the supports have the same behavior whatever the ligand grafted via a diazo or an amide bridge. Thus, increase of salicylic acid entity number does not improve the performance of the supports. However, bridge used during grafting seems to have an influence upon the extraction yields observed.