Marine macroalgae Pelvetia canaliculata (Linnaeus) as natural cation exchanger for metal ions separation: A case study on copper and zinc ions removal

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Franciélle Girardi (Author) FEUP; Fabíola V. Hackbarth (Author) FEUP; Selene M. A. Guelli U. De Souza (Author) Other; Antônio Augusto U. De Souza (Author) Other; Rui A. R. Boaventura (Author) Other; Vítor J. P. Vilar (Author) Other

Journal

Title: Chemical Engineering Journal

Vol. 247

Pages: 320-329

ISSN: 1385-8947

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 20 Citations

ISI Web of Science

Scopus - 30 Citations

Scientific classification

FOS: Engineering and technology > Environmental engineering

CORDIS: Technological sciences > Technology > Environmental technology

Associated Projects

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

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

Other information

Authenticus ID: P-009-BXX

DOI: 10.1016/j.cej.2014.03.007

Abstract (EN): The aim of this study was to investigate the cation exchange capacity of the macro-algae Pelvetia canaliculata (Linnaeus) for Cu2+ and Zn2+ removal from aqueous solutions in a batch system. Carboxylic and sulfonic groups present in the surface of the macroalgae are the main functional groups responsible by Cu2+ and Zn2+ removal. Tests with the raw algae showed that sodium, potassium, magnesium and calcium are easily replaced by copper and zinc ions. Considering that the sodium chloride salt is the most abundant salt and available throughout the world at low price, all the binding sites of the natural cation exchanger were converted into the sodium form. The mass action law for the ternary mixtures, Cu2+/H+/Na+ or Zn2+/H+/Na+., was able to predict the equilibrium data, getting selectivity coefficients of copper vs. sodium higher than zinc versus sodium and hydrogen vs. sodium for the carboxylic groups. At pH 4.0, almost all binding sites were occupied by copper and zinc ions, achieving maximum uptake capacities near 2.4 mEq/g. A mass transfer model, using the mass action law to describe the ternary equilibrium, and considering a linear driving force model to describe the intraparticle mass resistance, was able to predict the kinetic profiles for both ternary systems in a batch system.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10