This article presents an ecologically safe aqueous two-phase system based on poly(ethylene oxide) with a molecular weight of 1500, designed for complex extraction of Ni(II), Co(II), Fe(III), Mn(II), Zn(II), Cu(II), and Al(III) from nitrate solutions. A kinetic dependence has been investigated for a distribution ratio for the metals examined. The influence of pH-values, temperature, initial metal concentration, and nitric acid content have on the extraction of a wide range of metals in the heterogeneous poly(ethylene oxide) 1500-NaNO3-H2O system has been discovered. As a result, the complex extraction of metals (EMe > 60%) was achieved in one step of extraction without introducing additional chemicals into the system.
Liquid–liquid
equilibria of an aqueous two-phase system
consisting of poly(ethylene oxide) 1500, sodium nitrate, and water
at 293.15, 313.15, and 333.15 K were studied. Binodal data and a complete
phase diagram with equilibrium liquid-phase compositions were obtained
by using conductometry and refractometry techniques. The equilibrium
data for aqueous two-phase systems were correlated using the UNIQUAC
model, and new binary interaction parameters were calculated.
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