Cd(II) and Pb(II) extraction and transport modeling in SLM and PIM systems using Kelex 100 as carrier

被引:104
作者
Aguilar, JC [1 ]
Sánchez-Castellanos, M [1 ]
de San Miguel, ER [1 ]
de Gyves, J [1 ]
机构
[1] Univ Nacl Autonoma Mexico, Dept Quim Analit, Fac Quim, Mexico City 04510, DF, Mexico
关键词
coupled; facilitated transport; liquid membranes; transport modeling; Cd(II) and Pb(II);
D O I
10.1016/S0376-7388(01)00433-1
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The extraction and transport of Cd(II) and Pb(II) in two different membrane systems (SLM and PIM) using Kelex 100 as carrier was studied, proposing the corresponding chemical models of transport. A two-species transport model is proposed for Cd(II), according to solvent extraction (SX) data. Experimental SLM permeabilities are 9.7 x 10(-5) ms(-1), while measured PIM permeabilities are 5 x 10(-5) ms(-1). Values for the aqueous boundary layer thickness and for the diffusion coefficient of the metal cation-carrier complexes in the membrane phase were calculated from numerical fitting of experimental data using the proposed transport models. A highly selective Pb(II) separation was achieved in PIM systems based on the nature of the chemical equilibria involved in Cd(II) and Pb(II) membrane transport. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:107 / 118
页数:12
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