Removal of Cd(II), Zn(II) and Pb(II) from aqueous solutions by brown marine macro algae: Kinetic modelling

Specific marine macro algae species abundant at the Portuguese coast ( Laminaria hyperborea, 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 soluti...

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Bibliographic Details
Published in:Journal of hazardous materials 2008-05, Vol.153 (1), p.493-501
Main Authors: Freitas, Olga M.M., Martins, Ramiro J.E., Delerue-Matos, Cristina M., Boaventura, Rui A.R.
Format: Article
Language:English
Subjects:
Adsorption
Applied sciences
Bifurcaria bifurcata
Biological and medical sciences
Biosorption
Biotechnology
Cadmium - chemistry
Diffusion
Exact sciences and technology
Fucus spiralis
Fundamental and applied biological sciences. Psychology
General purification processes
Heavy metal
Kinetic modelling
Kinetics
Laminaria hyperborea
Lead - chemistry
Marine
Marine macro algae
Methods. Procedures. Technologies
Models, Chemical
Others
Phaeophyceae - chemistry
Pollution
Sargassum muticum
Solutions
Various methods and equipments
Waste Disposal, Fluid - methods
Wastewaters
Water Pollutants, Chemical - chemistry
Water Purification - methods
Water treatment and pollution
Zinc - chemistry
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Summary:Specific marine macro algae species abundant at the Portuguese coast ( Laminaria hyperborea, 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, 18.6–32.0 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
1873-3336
DOI:10.1016/j.jhazmat.2007.08.081