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Title: Removal of Cd(II), Zn(II) and Pb(II) from aqueous solutions by brown marine macro algae: kinetic modelling
Authors: Freitas, Olga
Martins, Ramiro
Matos, Cristina
Boaventura, Rui
Keywords: Biosorption
Heavy metal
Marine macro algae
Kinetic modelling
Issue Date: 2008
Publisher: Elsevier
Citation: Freitas,Olga; Martins,Ramiro; Matos,Cristina; Boaventura,Rui (2008) - Removal of Cd(II), Zn(II) and Pb(II) from aqueous solutions by brown marine macro algae: kinetic modelling. Journal of Hazardous Materials. ISSN 0304-3894. 153:1-2 (2008) p. 493-501
Abstract: Specific marine macro algae species abundant at the Portuguese coast (Laminaria hiperborea, Bifurcaria bifurcata, Sargassum muticum and Fucus spiralis) were shown to be effective for removing toxic metals (Cd(II), Zn(II) and Pb(II)) from aqueous solutions. The initial metal concentrations in solution were about 75-100 mg L-1. The observed biosorption capacities for cadmium, zinc and lead ions were in the ranges of 23.9-39.5 mg g-1, 18.6-32.0 mg g-1 and 32.3-50.4 mg g-1, respectively. Kinetic studies revealed that the metal uptake rate was rather fast, with 75% of the total amount occurring in the first 10 min for all algal species. Experimental data were well fitted by a pseudo-second order rate equation. The contribution of internal diffusion mechanism was significant only to the initial biosorption stage. Results indicate that all the studied macro algae species can provide an efficient and cost-effective technology for eliminating heavy metals from industrial effluents.
ISSN: 0304-3894
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Appears in Collections:DTQB - Artigos em Revistas Indexados ao ISI/Scopus

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