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Ion exchange prediction model for multi-metal systems obtained from single-metal systems using the macroalga Pelvetia canaliculata (Phaeophyceae) as a natural cation exchanger

Title
Ion exchange prediction model for multi-metal systems obtained from single-metal systems using the macroalga Pelvetia canaliculata (Phaeophyceae) as a natural cation exchanger
Type
Article in International Scientific Journal
Year
2015
Authors
Fabíola Hackbarth
(Author)
FEUP
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Franciélle Girardi
(Author)
FEUP
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Antônio Augusto U. de Souza
(Author)
Other
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João C. Santos
(Author)
FEUP
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Rui A. R. Boaventura
(Author)
FEUP
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Vítor J. P. Vilar
(Author)
FEUP
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Selene M. A. Guelli U. de Souza
(Author)
FEUP
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Journal
Vol. 260
Pages: 694-705
ISSN: 1385-8947
Publisher: Elsevier
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Publicação em ISI Web of Science ISI Web of Science
INSPEC
Scientific classification
FOS: Engineering and technology > Environmental engineering
CORDIS: Technological sciences > Technology > Environmental technology
Other information
Authenticus ID: P-00A-0V8
Abstract (EN): The aim of this study was to investigate the cation exchange capacity of the macroalga Pelvetia canaliculata (Linnaeus) Decaisne & Thuret in a multi-metal system containing Cd2+, Pb2+, Cu2+ and Zn2+. The Naloaded alga was established as a cation exchanger, in which cadmium, lead, copper, zinc and hydrogen ions present in the liquid phase exchange with sodium ions bound to the functional groups on the algal surface, mainly weakly acidic carboxylic groups and strongly acidic sulfonic groups. A mass action law for the senary system (Na+/H+/cd(2+)/Pb2+/Zn2+) was able to predict the equilibrium data using the selectivity coefficients determined for the single-metal systems. Multi-metal equilibrium results, in agreement with the selectivity coefficients, showed a higher preference (affinity) of the biomass toward lead ions followed by copper, cadmium and zinc ions. A mass transfer model, considering equilibrium given by the mass action law, and a linear driving force model for intraparticle diffusion, was able to fit well the batch kinetic experimental data for all chemical species in the liquid and solid phase. The results indicate that the biomass of P. canaliculata is an efficient natural cation exchanger for multi-metal systems.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 12
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