Extraction of some heavy metal ions from aqueous solution with new ecofriendly solvent

In this work, the use of Green Ethanolic and Hexanolic Extractant (GEE, GHE) as an extractant agent has been investigated in a variety of solvent extraction methods for iron, copper, manganese and zinc from aqueous solution. The impact of several parameters, including diluent type, pH, GEE, GHE extractant concentration, A/Oratio and temperature of extraction process were investigated. The thermodynamic parameters, including Delta H degrees, Delta G degrees and Delta S degrees were evaluated. The extraction of metal ions by GEE and GHE is an exothermic process from the negative value of enthalpy change (Delta H). The extraction efficiencies of 10% (v/v) GEE for Fe, Mn, Cu and Zn were determined to be 92%, 87%, 77% and 72%, while the extraction efficiencies of 10% (v/v) GHE for Fe, Mn, Cu and Zn were determined to be 88%, 86%, 84% and 87%, respectively. The loaded Fe, Mn, Cu and Zn, can be stripped using 1 M H2SO4 as inorganic acid. The maximum stripping efficiency for removal of loaded metals ions on GEE and GHE were studied.