Transport of Metallic Ions through Polyaniline-containing composite membranes
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hdl:2117/10929
Tipus de documentArticle
Data publicació2010-09-30
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Abstract
The extraction of Na+, Ni2+, and Cr3+ using six different membranes made of polyaniline composited with
high-impact polystyrene, which differ in the doping agent and/or the preparation method, has been investigated.
The swelling and ion-exchange capacities of the six polyaniline composited with high-impact polysterene
(HIPS/PAni) membranes have been determined and compared with that of the commercial Selemion
membrane. Electrodialysis tests using a five-compartment cell evidenced that the extraction of ions depends
on the electronic structure of the SO3
- groups, which is modulated by the doping agent, and on both
microstructure and electrical resistance of the membrane, which are regulated by the preparation method.
The transport of ions through HIPS/PAni and Selemion membranes was found to be comparable. Quantum
mechanical calculations on model complexes have been performed to characterize the electronic structure
of the dopants. Results indicate that the strength of the interaction between the different doping agents and
the polyaniline is inversely proportional to the concentration of negative charge in the SO3
- group of the
former. Moreover, both the binding energy and the distribution of charges calculated for dopant · · · PAni
complexes have been compared with those predicted for dopant · · · metallic ion complexes.
CitacióFerreira, C. [et al.]. Transport of Metallic Ions through Polyaniline-containing composite membranes. "Journal of chemical and engineering data", 30 Setembre 2010, vol. 55, núm. 1, p. 4801-4807.
ISSN0021-9568
Versió de l'editorhttp://pubs.acs.org/doi/pdfplus/10.1021/je1004033
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