Abstract
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.
Highlights
One of the most important issues in the world today is the growth of e-waste volumes [1,2], the growing quantity of which, first and foremost, is a result of constantly advancing technologies and the ever greater human desire to possess new, more modern technical means
This article studied the extraction of Ni(II), Co(II), Fe(III), Mn(II), Zn(II), Cu(II), and Al(III) from nitrate solutions in the aqueous two-phase systems based on poly(ethylene oxide) (PEO) 1500 which we proposed earlier [28]
Equilibrium was reached in the nitrate systems in 5 min, which had to do with the low surface tension of aqueous two-phase systems (ATPS) and, as a result, via a quick mass transfer
Summary
One of the most important issues in the world today is the growth of e-waste volumes [1,2], the growing quantity of which, first and foremost, is a result of constantly advancing technologies and the ever greater human desire to possess new, more modern technical means. The cylindrical Ni-MH batteries contain a large quantity of important metals (19.9% Ni, 15.4% Fe, 12.1% La, 5.16% Ce, 4.41% Co, 0.79% Zn, 0.73% Mn, 0.25% Al, 0.01% Cu, among others) [4]. Over a number of years, different methods have been used for metal ion extraction. These methods have been ion exchange [5], adsorption [6], chemical precipitation [7], membrane separation [8], and solvent extraction [9,10,11]. Most of the above methods come with certain disadvantages, such as high consumption of organic solvents, incomplete extraction of metal ions, and the high cost of the chemicals. Aqueous two-phase systems (ATPS) based on water-soluble polymers [12]
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