Szczepańska, Grażyna

Szczepański, Piotr

Wódzki, Romuald

English

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 XVII-th ARS SEPARATORIA – Borówno, Poland 2002   SIMULTANEOUS RECOVERY AND CONCENTRATION  OF Zn(II) AND Cu(II) IN DOUBLE MULTIMEMBRANE  HYBRID SYSTEM (D-MHS)  Piotr SZCZEPAŃSKI, Grażyna SZCZEPAŃSKA  and Romuald WÓDZKI   Nicholas Copernicus University, Faculty of Chemistry 87-100 Toruń, 7 Gagarina St., Poland e-mail: wodzki@chem.uni.torun.pl  This work deals with functioning of a double multimembrane hybrid system (D-MHS) of the composition:   Strip-1 H2SO4 CEM NAFION LM-1 CYANEX CEM NAFIONFeed Zn2+,Cu2+ CEM NAFIONLM-2 ACORGACEM NAFION Strip-2 H2SO4   where CEM denotes a cation exchange membrane, a f – feed solution, s – stripping solution and LM – liquid membrane. The main aim of this study was to design an experimental D-MHS system sufficient for the simultaneous recovery and separation of Zn2+ and Cu2+ from dilute aqueous solutions. According to the above-presented scheme, the D-MHS operation involves a series of ion-exchange-diffusion processes (in CEMs) coupled to the LM transports mediated by two different carriers. It was found experimentally that the D-MHS separation ability depends mainly on the composition of an organic phase and, specifically, on the carrier properties. Some representative results corresponding with D-MHS with Acorga P-50 and Cyanex 302 (or D2EHPA) as the selective carriers of Zn2+ and Cu2+, respectively, are listed in Tab.1.  Table. 1. Fluxes in the D-MHS system: feed: 0,01 M Zn(NO3)2 and Cu(NO3)2; strip 1 M H2SO4, LM 0,1 M carrier in kerosene Fluxes [mol/cm2s] Zn2+ Cu2+ LM-1 LM-2 S-1 S-2 S-1 S-2 Cyanex 302 Acorga P-50 1,6×10-10 1,1×10-12 ≈0 6,8×10-10 D2EHPA Acorga P-50 6,2×10-10 8,8×10-13 6,8×10-11 3,4×10-10  The results of this study prove that two simultaneously operating MHS systems allow the efficient separation and recovery of two cations. The optimization of the carrier concentration in a given liquid membrane and the concentration of the stripping agent in external stripping solutions could enhance the system performances. H+ H+Zn2+ Cu2+

Simultaneous recovery and concentration of Zn(II) and Cu(II) in double multimembrane hybrid system (D-MHS)

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Simultaneous recovery and concentration of Zn(II) and Cu(II) in double multimembrane hybrid system (D-MHS)

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