Biosorption of cadmium with brown macroalgae

Biosorption of cadmium with brown macroalgae

•Lessonia nigrescens and Durvillaea antarctica adsorb cadmium efficiently.•The sorption kinetics for Durvillaea antarctica followed a pseudo second order model.•The Lessonia nigrescens sorption could better be described by first order kinetics.•Langmuir isotherm model was adequate for both seaweeds...

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Bibliographic Details
Published in:Chemosphere (Oxford) Vol. 138; pp. 164 - 169
Main Authors: Gutiérrez, Claudia, Hansen, Henrik K., Hernández, Piroska, Pinilla, Carolina
Format: Journal Article
Language:English
Published: England Elsevier Ltd 01-11-2015
Subjects:
Adsorption
Adsorption isotherm
Antarctica
Cadmium
Cadmium - isolation & purification
Cadmium uptake
Contact
Durvillaea antarctica
Hydrogen-Ion Concentration
Isotherms
Kinetics
Lessonia nigrescens
Mathematical models
Models, Theoretical
Optimization
Phaeophyceae - chemistry
Seaweed - chemistry
Sorption
Sorption kinetics
Uptakes
Wastewater - chemistry
Water Pollutants, Chemical - isolation & purification
Water Purification - methods
PS, Antarctica
Durvillaea antarctica
Lessonia nigrescens
Cadmium uptake
Sorption kinetics
Adsorption isotherm
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Summary:•Lessonia nigrescens and Durvillaea antarctica adsorb cadmium efficiently.•The sorption kinetics for Durvillaea antarctica followed a pseudo second order model.•The Lessonia nigrescens sorption could better be described by first order kinetics.•Langmuir isotherm model was adequate for both seaweeds studied. Sorption experiments for cadmium removal using two brown macroalgae Lessonia nigrescens and Durvillaea antarctica were carried out. Although both types of algae were capable of retaining cadmium, differences in their performance were observed. The optimum pH was 3.7±0.2, and to achieve the equilibrium, 5days of contact time were necessary for both biosorbents. The maximum experimental uptake obtained was similar for the two biosorbents: 95.3mgCdg−1 by D. antarctica and 109.5mgCdg−1 by L. nigrescens. The Langmuir model described the equilibrium sorption isotherms very well for both biosorbents and the Lagergren pseudo primer order model described the sorption kinetics for L. nigrescens satisfactorily and the Ho and Mckay pseudo second order model for D. antarctica. It was found that cadmium uptake by D. antarctica was faster than by L. nigrescens.
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content type line 23
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2015.06.002