Biosorption of cadmium by biomass of brown marine macroalgae

Five different brown seaweeds, Bifurcaria bifurcata, Saccorhiza polyschides, Ascophyllum nodosum, Laminaria ochroleuca and Pelvetia caniculata were studied for their ability to remove cadmium from aqueous solution. Kinetics of cadmium adsorption by all the algae were relatively fast, with 90% of tot...

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Bibliographic Details
Published in:Bioresource technology 2005-11, Vol.96 (16), p.1796-1803
Main Authors: Lodeiro, P., Cordero, B., Barriada, J.L., Herrero, R., Sastre de Vicente, M.E.
Format: Article
Language:English
Subjects:
Acid–base properties
Adsorption
Ascophyllum nodosum
Bifurcaria bifurcata
Biodegradation, Environmental
Biological and medical sciences
Biosorption
Biotechnology
Cadmium
Cadmium - isolation & purification
Cadmium - pharmacokinetics
Computer Simulation
Equilibrium
Fundamental and applied biological sciences. Psychology
Hydrogen-Ion Concentration
Kinetics
Laminaria ochroleuca
Marine macroalgae
Metabolic Clearance Rate
Models, Biological
Pelvetia
Pelvetia caniculata
Saccorhiza polyschides
Seaweed - growth & development
Seaweed - metabolism
Water Pollutants, Chemical - pharmacokinetics
Water Purification - methods
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Summary:Five different brown seaweeds, Bifurcaria bifurcata, Saccorhiza polyschides, Ascophyllum nodosum, Laminaria ochroleuca and Pelvetia caniculata were studied for their ability to remove cadmium from aqueous solution. Kinetics of cadmium adsorption by all the algae were relatively fast, with 90% of total adsorption occurring in less than 1 h. These experiments could be accurately described by a pseudo-second-order rate equation, obtaining values between 1.66 × 10 −3 and 9.92 × 10 −3 g/mg min for the sorption rate constant k. Several equilibrium adsorption isotherms were obtained for the quantitative description of cadmium uptake. The use of the Langmuir isotherm led to values between 64 and 95 mg/g for q max and between 0.036 and 0.094 L/mg for b. The effect of pH on biosorption was also studied. Acid–base properties of algae were studied by potentiometry to determine p K values (from 3.54 to 3.98) and the total number of acid groups.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2005.01.002