Application of Oxazolone Azo Dye Modified Alumina as NewSorbent for Separation of Palladium from Anodic Slime andWastewater Samples

In the present work, a new kind of alumina-based adsorbent with high selectivity and stability and efficient adsorption was prepared.Alumina was coated with an oxazolone azo dye, 2-(4-{2-[4-(dimethylamino) phenyl]-1-diazenyl}phenyl)-4-[1-phenyl methylidene]-5(4H)-oxazolone, and then used for preconcentration of trace amounts of palladium. The analytical procedure involved the complexformation of Pd with oxazolone azo dye as a chelating agent in buffer media of pH 5. The stability of sorbent was excellent andadsorption capacity did not change significantly after 100 consecutive uses of 50.0 mg of modified alumina. Under the optimumconditions, the preconcentration factor of the method was 150. The linearity was maintained in the concentration range of 0.33 ngmL-1 to 8.0 mg mL-1 in the original solution. For 2.0 μg mL-1 of Pd, the relative standard deviation 1.4% and detection limit 0.25 ngmL-1 was obtained. The proposed method was successfully applied to the determination of trace amounts of palladium in the anodicslime and wastewater samples

Keywords:

Modified Alumina , Oxazolone Azo Dye , Palladium , Wastewater