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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2015

Autores

Fabíola Hackbarth (Autor) FEUP; Franciélle Girardi (Autor) FEUP; Antônio Augusto U. de Souza (Autor) Outra; João C. Santos (Autor) FEUP; Rui A. R. Boaventura (Autor) FEUP; Vítor J. P. Vilar (Autor) FEUP; Selene M. A. Guelli U. de Souza (Autor) FEUP

Revista

Título: Chemical Engineering Journal

Vol. 260

Páginas: 694-705

ISSN: 1385-8947

Editora: Elsevier

Indexação

ISI Web of Knowledge - 10 Citações

ISI Web of Science

Scopus - 12 Citações

INSPEC

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia do ambiente

CORDIS: Ciências Tecnológicas > Tecnologia > Tecnologia ambiental

Projetos Associados

LA 20 - PROJECTO ESTRATÉGICO - LA 20 - 2013-2014

ALGAEVALUE - Valorização de macroalgas marinhas na separação e recuperação de iões metálicos tóxicos presentes em água

Outras Informações

ID Authenticus: P-00A-0V8

DOI: 10.1016/j.cej.2014.09.044

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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 12