Synthesis of new ligand as imidazole derivative 2-[α-Naphthylazo]-4,5-diphenylimidazole and its application about extraction of copper (II) and Sliver (I) from aqueous solutions

Abstract

New derivative for imidazole compound which is 2-[α-Naphthylazo]-4,5-diphenylimidazole (α-NADPI) used as ligand for extraction of copper (II) and silver (I) according to solvent extraction method, dependence on the selectivity and sensitivity of imidazole compounds, toward transition metal cations, the experiment for extraction shows the optimum pH value was for Cu+2 ion (pHex= 7) and for Ag+ ion was (pHex= 9), the study effect of metal ions concentration shows the optimum concentration giving high distribution ratio (D) was (30 µg) (4.7×10-5 M) for Cu+2 and (50 µg) (4.63×10-5 M) for Ag+, in the kinetic side for extraction study shows optimum shaking time for extraction was (15 minutes) for Cu+2 and Ag+. Organic solvents effect studies shows there is not any linear relation between distribution ratio (D) and dielectric constant (ε) for organic solvents used but there is an effect for organic solvent structure on the extraction method to increase the stability of ion pair complex extracted, as well as stoichiometric studies shows the structure of ions pair complex extracted was (1:1) (metal:ligand) for both metal ions as [Cu(α-NADPI)]+2SO4-2 and [Ag(α-NADPI)]+NO3-.