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Biosorption characteristics of uranium(VI) from aqueous medium onto Catenella repens, a red alga
The biosorption characteristics of uranium(VI) onto Catenella repens (a red alga), were evaluated as a function of pH, biosorbent size, time, biomass dosage, initial uranium concentration and temperature. Within the pH range studied (1.5–7.5), 4.5 was the optimum pH for the uptake of uranium(VI) by...
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Published in: | Journal of hazardous materials 2008-10, Vol.158 (2), p.628-635 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that cite this one |
Online Access: | Get full text |
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Summary: | The biosorption characteristics of uranium(VI) onto
Catenella repens (a red alga), were evaluated as a function of pH, biosorbent size, time, biomass dosage, initial uranium concentration and temperature. Within the pH range studied (1.5–7.5), 4.5 was the optimum pH for the uptake of uranium(VI) by
C. repens. Reduction in particle size did not increase the biosorption capacity. The metal removal was rapid, with more than 90% of total biosorption taking place in 30
min, and equilibrium was attained in 45
min. The maximum metal loading capacity of the alga was 303
mg/g. Within the temperature range studied (15–55
°C), there was no significant change in biosorption, under optimal conditions. Adsorption process could be well defined by both the Langmuir and Freundlich isotherms with
r
2 of 0.94 and 0.96, respectively. The kinetic data fitted the pseudo-second-order kinetic model with the
r
2 value of 0.99. At a low pH of 2.5, where most of the biomasses show either no or less metal uptake, a good (>15%) metal loading capacity of 25% was achieved. Therefore biosorption characteristics were also evaluated at pH 2.5. |
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ISSN: | 0304-3894 1873-3336 |
DOI: | 10.1016/j.jhazmat.2008.02.042 |