Extraction of Nickel (II) From Aqueous Solutions By Using 2-[ (4-Bromo Phenyl) Azo]-4,5-Diphenyl Imidazole

Abstract

The extraction of Nickel has been studied as complex with 2-[ (4-Bromo phenyl) azo]-4,5-diphenyl imidazole which dissolved in chloroform .This search comprises the following aspects: the optimum pH values for extraction was (pH_ext. = 9 ), so the suitable concentration of Ni(II) ions in aqueous solution which is giving highest distribution ratio (D) was (80 μg ) ,studying effect of extraction time illustrated the optimum shaking time to reach the equilibria was ten minute .It was found from experiments  that  the  best  value  of   D  when the concentration of  ligand  equal   to [3x10^{-5 M}  ] , from other hand organic solvents shows that there is no linear relation ship between dielectric constant of organic solvents and distribution ratio (D)  of extraction ,but there is an effect for the organic solvent structure. The thermodynamic study demonstrates the complexation reaction is  an exothermic at temperature degrees (20 ⁰C  - 70 ⁰C).