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ABSTRACT: The use of micelle-based separation methods represents a recent, interesting alternative to the techniques based on classic liquid—liquid extractions. Among them, micellar-enhanced ultrafiltration allows the efficient concentration and removal of organic and inorganic analytes from aqueous solutions.Mixed micelles containing suitable derivatives of salicylic acids having an alkyl substituent of variable length have been investigated as model candidates for preconcentration of iron(III). The metal ion accumulates in the host aggregate after reaction with the cheating ligand and the micelles are successively separated from the bulk solution by passing through hydrophilic membranes of proper pore size.The concentration efficiency depends on the ligand and complex binding to the micelles. The effects of experimental parameters on the ultrafiltration performances have been investigated, and the complete removal of the metal ion has been achieved by properly selecting the surfactants and by modulating the hydrophobicity of the chelating agents.
Colloids and Surfaces.