Extraction studies of FeIII metal ion from hydrobromic acid medium using Cyanex-923 extractant

Department of Chemistry, University of Mumbai, Lokmanya Tilak Bhavan, Vidyanagari, Santacruz (E),
Mumbai-400 098, India
E-mail : sureshpawar2004@gmail.com
Manuscript received online 11 February 2016, accepted 08 July 2016

A systematic study of solvent extraction of Fe^III from hydrobromic acid medium using neutral phosphine oxide extractant, Cyanex-923 in toluene has been proposed. This metal ion was found to be quantitatively extracted with Cyanex-923 in toluene in the acidic range of 6–7 M HBr and from the organic phase it is stripped back into the aqueous phase with water. The effect of HBr concentration, reagent concentration, equilibrium period, effect of diluents, effect of equilibration period and stripping agent on the extraction of Fe^III has been studied. The stoichiometry of the extracted species was determined on the basis of slope analysis method. Based on these results a sequential procedure for their separation from each other was developed.