The efficiency of the red alga Mastocarpus stellatus for remediation of cadmium pollution

This work reports the results of the study for cadmium binding by the dead red macroalga Mastocarpus stellatus. Kinetics sorption experiments demonstrated the high rate of metal biosorption: the system attained over 50% of the total biomass cadmium uptake within 2 min of contact and over 90% in the...

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Bibliographic Details
Published in:Bioresource technology 2008-07, Vol.99 (10), p.4138-4146
Main Authors: Herrero, R., Lodeiro, P., Rojo, R., Ciorba, A., Rodríguez, P., Sastre de Vicente, Manuel E.
Format: Article
Language:English
Subjects:
Adsorption
Biodegradation, Environmental
Biological and medical sciences
Biomass
Biosorption–desorption
Biotechnology
Biotechnology - methods
Cadmium
Cadmium - analysis
Environmental Pollution
Fundamental and applied biological sciences. Psychology
Kinetics
Marine macroalgae
Mastocarpus stellatus
Metals - analysis
Metals - chemistry
Models, Chemical
Potentiometry
Rhodophyta - metabolism
Temperature
Water Pollutants, Chemical - analysis
Water Purification - methods
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Summary:This work reports the results of the study for cadmium binding by the dead red macroalga Mastocarpus stellatus. Kinetics sorption experiments demonstrated the high rate of metal biosorption: the system attained over 50% of the total biomass cadmium uptake within 2 min of contact and over 90% in the first 9 min. The kinetic data were successfully described by a pseudo-second order model with rate constants ranging from 1.06 to 10 g mmol −1 min −1, as a function of initial metal concentration and temperature. The equilibrium binding was accurately represented in terms of Langmuir and Langmuir–Freundlich models. The sorption isotherms at constant pH showed uptake values as 0.49 mmol g −1 (at pH 2.4), 0.56 mmol g −1 (at pH 4) and 0.59 mmol g −1 (at pH 6), while the affinity constant values were between 0.6 and 5 mmol −1 L (Langmuir fit). The acid–base properties of the alga were also studied, obtaining the total number of acid groups, 2.5 mmol g −1, and their apparent p K value, 1.56, using the Katchalsky model. Desorption studies were conducted employing different HNO 3 concentrations and desorption times.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2007.08.065