Transport of lead across polymer inclusion membrane with p-tert -butylcalix[4]arene derivative
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Czestochowa University of Technology
Technical University of Gdańsk
M. Ulewicz   

Department of Metal Extraction and Recirculation, Czestochowa University of Technology, 42-200 Częstochowa, Armii Krajowej 19 Street
Publication date: 2010-01-01
Physicochem. Probl. Miner. Process. 2010;44(1):245–256
The facilitated transport of lead(II) across polymer inclusion membranes (PIMs), which consist of cellulose triacetate as polymeric support, o-nitrophenyl octyl ether as plasticizer and 25, 26, 27, 28 – Tetrakis(N–hydroxy-N-methylcarbamoylmethoxy)-p-tert-butylcalix[4]aren (L) as ion carrier was reported. PIM was characterized by using atomic force microscopy (AFM). The results show that Pb2+ can be separated very effectively from other heavy and transition metal cations as Zn2+, Cd2+, Co2+, Ni2+ (each at a concentration of 10-3 M). The rate limiting step in the transport of Pb2+ across PIM doped with calix[4]aren derivative may be the diffusion coefficient of the carrier cation complex across the membrane. The stability of PIM with p-tert-butylcalix[4]aren derivative was described using Danesi’s thermodynamic model. The apparent partition constant of the carrier was experimentally estimated and compared with different carriers.