Removal of methylene blue from aqueous solutions using as biosorbent sargassum muticum: an invasive macroalga in Europe
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Removal of methylene blue from aqueous solutions using as biosorbent sargassum muticum: an invasive macroalga in EuropeAutor(es)
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2005-11-09Resumo
[Abstract] Methylene blue adsorption on Sargassum muticum, an invasive macroalga in Europe, has been
investigated using visible absorption spectroscopy. Different pre-treatments, protonation and chemical
cross-linking with CaCl2 or H2CO, have been tested in order to improve the stability as well as the
adsorption capacity of the algal biomass. The equilibrium binding has been described in terms of
Langmuir or Freundlich isotherms depending on the algal pre-treatment; from the maximum
adsorption capacity values, an estimation of the algal specific surface area was made. Moreover, it
has been found that adsorption kinetics can be described according to the first order Lagergren model,
from which the rate constant and the adsorption capacity were determined. Finally, simple empirical
equations were obtained to evaluate the amount of methylene blue removed at any initial
concentration and reaction time. The results obtained have shown that this type of material has a high
adsorption capacity for methylene blue dye, this feature together with the short times needed to reach
the equilibrium suggest that Sargassum muticum can be used as a low-cost biosorbent in wastewater
treatments.
Palabras chave
Biosorption
Dye adsorption
Sargassum muticum
Isotherms
Adsorption kinetics
Dye adsorption
Sargassum muticum
Isotherms
Adsorption kinetics
Descrición
"This is a preprint of an article accepted for publication in Journal of chemical technology and biotechnology copyright 2005"
ISSN
0268-2575