Synergistic and selective extraction of Cd2+ from acidic solution containing Cd2+, Co2+, Ni2+ by triisooctylamine (TIOA) and tributyl phosphate (TBP)

Selective and synergistic extraction of cadmium from acidic iodine solutions containing Cd2+, Co2+ and Ni2+using solvent extraction (SX) technique is presented in this study. The study has highlighted the importance of main and synergistic extractants composition. The mixtures have evident synergistic effects on Cd2+ with a synergistic enhancement factor of 2.22. The various experimental parameters were studied to determine the optimum extraction and stripping conditions of Cd2+. Under optimum conditions, the maximum extraction efficiency (99.7%) was achieved when using 1.5% (v/v) TIOA and 0.5% (v/v) TBP in dichloromethane within 5 min. Extracted Cd2+ was stripped effectively from the organic phase using 2.0 mol/L NaOH solution.