Synergistic Extraction of Zinc (II) with TOA and TPPO

Abstract

Zinc (II) has been effectively extracted in acidic media using a combination of tri-octyl amine (TOA) and tri-phenyl-phosphine oxide (TPPO) with xylene. The stoichiometry calculation of different parameters like contact time, pH, and temperature was observed and noted from the zinc (II) concentration during the extraction of zinc (II). The equilibrium time and thermodynamic factors like ΔH, ΔG, and ΔS were measured. In the stripping process of the extracted metal by nitric, sulfuric, perchloric, and hydrochloric acids, 99% of Zn (II) was recovered by two contact stages using sulfuric acid from the organic phase. The main goal was to examine the impacts of TOA and TPPO in an acidic medium to correlate the interaction among the mixtures. It was easy to validate the presence of TOA and TPPO in the extraction and interaction of zinc (II) in the binary combination by employing FTIR spectra analysis, which also provided information on the chemical interactions produced. TG-DSC and Fourier Transform Infrared (FTIR) spectra show two separate stages during the thermal dissociation of zinc: the ligand complex of TOA and TPPO in xylene.