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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2012

Autores

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

Revista

Título: Chemical Engineering Journal

Vol. 200

Páginas: 365-372

ISSN: 1385-8947

Editora: Elsevier

Indexação

ISI Web of Knowledge - 10 Citações

Scopus - 14 Citações

INSPEC

Projetos Associados

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

Outras Informações

ID Authenticus: P-002-6X7

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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8