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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
biochemistry, genetics and molecular biology
Removal of heavy metal ions from aqueous solutions by filtration with a novel complexing membrane containing poly(ethyleneimine) in a poly(vinyl alcohol) matrix
Journal of Membrane Science, Volume 307, No. 2, Year 2008
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Description
A novel complexing membrane was used for the removal of heavy metal ions such as Pb(II), Cd(II) and Cu(II) from aqueous solutions. The membrane consists in a semi-interpenetrating polymer network of crosslinked poly(vinyl alcohol) as the matrix and poly(ethyleneimine) as the complexing polymer. The absorption reactions followed pseudo-first-order kinetics with similar rate constants for the three cations. A model is proposed for the absorption-desorption process in order to rationalize the data obtained for the retention ratio and the retention efficiency ratio. The corresponding equilibrium constants were determined for the three metal ions, showing that the affinity order of the membrane is Pb > Cu > Cd. This sequence is consistent with the order of maximum uptake of the ions per gram of membrane: 0.59, 0.47 and 0.33 mmol g-1, respectively. On the other hand, the uptake order is different on a mass basis: 123, 30 and 37 mg g-1, respectively. Regeneration of the membrane and metal recovery were studied with HCl and HNO3 at different concentrations. Filtration of solutions of each metal ion showed large elimination ratios (96-99.5%) with a retention sequence Cd > Cu > Pb. The membrane remained efficient until complete saturation of its sites. Moreover, Cu retention is larger than expected, indicating possible additional chelation by the PVA matrix. Better retention ratios were observed when the concentration of the feed solution was kept constant. Filtration of a mixture of the three cations (all at 100 ppm concentration) resulted in the same retention sequence, but the elimination ratios were smaller and Pb was eventually displaced by Cu and Cd that were present in larger molar concentrations. © 2007 Elsevier B.V. All rights reserved.
Authors & Co-Authors
Bessbousse, Haad
France, Mont-saint-aignan
Université de Rouen Normandie
Morocco, Settat
Université Hassan 1er
Rhlalou, Touria
Morocco, Settat
Université Hassan 1er
Verchère, Jean François
France, Mont-saint-aignan
Université de Rouen Normandie
Lebrun, Laurent
France, Mont-saint-aignan
Université de Rouen Normandie
Statistics
Citations: 268
Authors: 4
Affiliations: 2
Identifiers
Doi:
10.1016/j.memsci.2007.09.027
ISSN:
03767388
Research Areas
Substance Abuse
Study Approach
Qualitative