Equilibrium, kinetic and thermodynamic study of the biosorption of uranium onto Cystoseria indica algae

Biosorption equilibrium, kinetics and thermodynamics of binding of uranium ions to Cystoseria indica were studied in a batch system with respect to temperature and initial metal ion concentration. Algae biomass exhibited the highest uranium uptake capacity at 15 °C at an initial uranium ion concentr...

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Bibliographic Details
Published in:Journal of hazardous materials 2008-02, Vol.150 (3), p.612-618
Main Authors: Khani, M.H., Keshtkar, A.R., Ghannadi, M., Pahlavanzadeh, H.
Format: Article
Language:English
Subjects:
Adsorption
Applied sciences
Biological and medical sciences
Biosorption
Biotechnology
Chemical engineering
Cystoseria indica
Equilibrium
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
Heat and mass transfer. Packings, plates
Kinetic
Kinetics
Methods. Procedures. Technologies
Models, Chemical
Others
Phaeophyceae - chemistry
Pollution
Stirred batch reactor
Thermodynamic
Thermodynamics
Uranium
Uranium - chemistry
Various methods and equipments
Waste Disposal, Fluid - methods
Water Pollutants, Radioactive - chemistry
Water Purification - methods
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Summary:Biosorption equilibrium, kinetics and thermodynamics of binding of uranium ions to Cystoseria indica were studied in a batch system with respect to temperature and initial metal ion concentration. Algae biomass exhibited the highest uranium uptake capacity at 15 °C at an initial uranium ion concentration of 500 mg l −1 and an initial pH of 4. Biosorption capacity increased from 198 to 233 mg g −1 with an decrease in temperature from 45 to 15 °C at this initial uranium concentration. The Langmuir isotherm model were applied to experimental equilibrium data of uranium biosorption depending on temperature. Equilibrium data fitted very well to the Langmuir model C. indica algae in the studied concentration range of Uranium ions at all the temperatures studied. The saturation type kinetic model was applied to experimental data at different temperatures changing from 15 to 45 °C to describe the batch biosorption kinetics assuming that the external mass transfer limitations in the system can be neglected and biosorption is chemical sorption controlled. The activation energy of biosorption ( E A) was determined as −6.15 using the Arrhenius equation. Using the thermodynamic equilibrium coefficients obtained at different temperatures, the thermodynamic constants of biosorption (Δ G°, Δ H° and Δ S°) were also evaluated.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2007.05.010