A new route synthesis of immobilized-polysiloxane iminodiacetic acid ligand system, its characterization and applications

A new route for the synthesis of immobilized-polysiloxane ligand system bearing iminodiacetic acid chelating ligand of the general formula P-(CH 2) 3N-(CH 2COOEt) 2, (where P represents [Si–O] n polysiloxane network) was accomplished. The preparation of the immobilized iminodiethylacetate was achieved by the reaction of 3-aminopropyltrimethoxysilane with ethyl chloroacetate followed by hydrolytic polycondensation of the diethyliminodiacetate silane agent and tetraethylorthosilicate via the sol–gel process. The immobilized iminodiacetic acid P-(CH 2) 3N-(CH 2COOH) 2 was obtained by hydrolysis of the ethyl acetate groups using diluted hydrochloric acid. The new functionalized ligand system exhibits high capacities for uptake of the metal ions (Co 2+, Ni 2+, Cu 2+ and Zn 2+), and forms 1:1 metal to ligand ratio complexes in the case of Ni 2+ and Cu 2+.