Abstract
A membrane process for metal recovery from aqueous solutions was studied. Metal ions diffused from the feed compartment to the stripping compartment through an hybrid Donnan dialysis which consists to combine two ion exchange membranes with solvent impregnated resin (SIR). The aim of this work is to study the recovery of Pb(II), Ag(I) and Cu(II) from nitrate solutions by using SIR combined with classical Donnan dialysis. The resin has been prepared by impregnating the Amberlite XAD-4 using three different extractants namely: di-2-ethyl hexyl phosphine acide (D2EHPA), tris-octyl phosphine oxide (TOPO) and Diphenylthiourea (DPT). Experiments were performed as a function of nature of the extractant impregnated on the XAD-4 resin as well as the concentration in the resin phase, the stripping pH, the concentration ratio of metal ions in the feed compartment and the nature of the counter ions in strip compartment. The results show that the D2EHPA is the better extractant for the metal ions used in this work, and it’s shown a good selectivity for the separation between ions.
Highlights
In recent years increasing interest in environment protection, economy of energy, as well as process optimization and the continuous progress in fundamental chemistry have produced an important development of new chemical separation techniques
The resin has been prepared by impregnating the Amberlite XAD-4 using three different extractants namely: di(2-ethylhexyl)phosphine acide (D2EHPA), tris-octyl phosphine oxide (TOPO) and Diphenylthiourea (DPT)
The results show that the D2EHPA is the better extractant for the metal ions used in this work, and it’s shown a good selectivity for the separation between ions
Summary
In recent years increasing interest in environment protection, economy of energy, as well as process optimization and the continuous progress in fundamental chemistry have produced an important development of new chemical separation techniques. The need of more specific systems for dilute metal recovery from both ecological and economic aspects has led to the development of the synthesis of new extractants, exchangers and adsorbents. These products have improved significantly the selectivity and efficiency of a large number of separation process techniques such as extraction with solvent supported liquid membranes, precipitation, etc. Among these new products, Solvent Impregnated Resins (SIR) has been postulated as a new technological alternative for problems associated with metal separation and recovery [1]. SIR was introduced in hydro- metallurgical applications by Warshawsky [3,6]
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