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Author(s): Amit Bhatnagar
Vítor J. P. Vilar
João C. Santos
Cidália M. S. Botelho
Rui A. R. Boaventura
Title: Valorisation of marine Pelvetia canaliculata for separation and recovery of nickel from water: equilibrium and kinetics modeling on Na-loaded algae
Issue Date: 2012
Abstract: In the present study, biosorption of Ni2+ by Na-loaded (raw algae treated with NaCl), algae Pelvetia canaliculataOchrophyta, was studied in a batch system. Kinetics and equilibrium experiments were conductedat different pH values (2.0, 3.0 and 4.0). The metal uptake capacity decreased by decreasing the solutionpH, suggesting that competition exists between hydrogen ions, present in high concentrations at low pHvalues, and metal ions. An ion-exchange model, considering two different binding sites, sulfonic and carboxylicgroups, was developed to describe equilibrium data. A mass transfer model, considering intraparticleresistance was also developed to describe kinetics in a batch system. The release of sodium ionsduring the uptake of nickel ions revealed that the biosorption mechanism involved ion-exchangebetween sodium and nickel ions with a stoichiometrical ratio of 2:1. Nickel showed higher affinity tothe sulfonic groups than for carboxylic ones of algae biomass. Kinetic results show that hydrogen ionsdiffuse 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.
Subject: Engenharia química, Engenharia do ambiente
Chemical engineering, Environmental engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia do ambiente
Engineering and technology::Environmental engineering
Related Information: info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Programa de Financiamento Plurianual de Unidades de I&D/PEst-C/EQB/LA0020/2011/Projeto Estratégico-LA 20 - 2011-2012/LA 20
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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