Valorisation of marine Pelvetia canaliculata for separation and recovery of nickel from water: equilibrium and kinetics modeling on Na-loaded algae

• Type: Article in International Scientific Journal
• Date: 2012

Authors

Amit Bhatnagar (Author) FEUP; Vítor J. P. Vilar (Author) FEUP; João C. Santos (Author) FEUP; Cidália M. S. Botelho (Author) FEUP; Rui A. R. Boaventura (Author) FEUP

Journal

Title: Chemical Engineering Journal

Vol. 200-202

Pages: 365-372

ISSN: 1385-8947

Publisher: Elsevier

Indexing

ISI Web of Science

Scopus

INSPEC

Scientific classification

FOS: Engineering and technology > Environmental engineering

CORDIS: Technological sciences > Engineering > Chemical engineering

Associated Projects

LA 20 - Projeto Estratégico-LA 20 - 2011-2012

Other information

DOI: 10.1016/j.cej.2012.06.071

Abstract (EN): In the present study, biosorption of Ni2+ by Na-loaded (raw algae treated with NaCl), algae Pelvetia canaliculata Ochrophyta, was studied in a batch system. Kinetics and equilibrium experiments were conducted at different pH values (2.0, 3.0 and 4.0). The metal uptake capacity decreased by decreasing the solution pH, suggesting that competition exists between hydrogen ions, present in high concentrations at low pH values, and metal ions. An ion-exchange model, considering two different binding sites, sulfonic and carboxylic groups, was developed to describe equilibrium data. A mass transfer model, considering intraparticle resistance was also developed to describe kinetics in a batch system. The release of sodium ions during the uptake of nickel ions revealed that the biosorption mechanism involved ion-exchange between sodium and nickel ions with a stoichiometrical ratio of 2:1. Nickel showed higher affinity to the sulfonic groups than for carboxylic ones of algae biomass. Kinetic results show that hydrogen ions diffuse faster as compared to nickel and sodium ions. The maximum uptake capacity of Na-loaded algae, P. canaliculata, for Ni2+ was found to be ca. 100 mg/g at pH 4.0.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8