Abstract
Transport and separation properties of a double multimembrane hybrid system (d-MHS) composed of: stripping solution (1) | MHS(1) | feed solution | MHS(2) | stripping solution (2) have been studied. In the system each MHS comprises an agitated bulk liquid membrane (BLM) placed between two cation-exchange polymer membranes (CEM). The simultaneous recovery and separation of Zn 2+ and Cu 2+ from a binary or multicomponent (Zn 2+, Cu 2+, Ca 2+, Mg 2+, K +, Na +) solution has been performed by using two parallel BLMs selectively transporting one of the two target cations. The d-MHS exploiting 5-nonylsalicyl-aldoxime (Acorga P-50, Cu 2+ selective) and di-(2-ethylhexyl) phosphoric acid (D2EHPA, Zn 2+ selective) in particular BLMs allows the simultaneous separation and up-hill transport of the two cations. A new d-MHS system integrated with the Donnan dialysis process (DD-d-MHS) has also been constructed in order to preconcentrate cations before their separation through the two MHS modules. The application of DD-d-MHS to remove Zn 2+ and Cu 2+ from contaminated (0.001 mol/dm 3 Zn(NO 3) 2 and Cu(NO 3) 2) tap water (model feed for electroplating rinse solution) results in approx 86–88% recovery of both cations from the feed and their active concentration with the following selectivity coefficients: β M Zn = 170 and β M Cu = 530.
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