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|Title:||Batch and column removal of total chromium from aqueous solution using Sargassum polycystum|
|Citation:||Senthilkumar, R., Vijayaraghavan, K., Jegan, J., Velan, M. (2010-10). Batch and column removal of total chromium from aqueous solution using Sargassum polycystum. Environmental Progress and Sustainable Energy 29 (3) : 334-341. ScholarBank@NUS Repository. https://doi.org/10.1002/ep.10416|
|Abstract:||A marine brown alga, Sargassum polycystum, showed high-chromium biosorption capacity in batch and column mode of operation. The biosorbent performance was strongly influenced by equilibrium solution pH, with pH 2 as optimal condition for Cr biosorp-tion. Isotherm experiments revealed that S. polycystum possessed a maximum chromium uptake of 69.4 mg/g at pH 2. The pseudo-second order model was found to describe the chromium kinetic biosorption data with high-correlation coefficients compared with pseudo-first order model. Various thermodynamic parameters, such as ΔG°, ΔH°, and ΔS°, were calculated, indicating that the present system was a spontaneous and endothermic process. A packed column was used to study the continuous chromium biosorption performance of S. poly-cystum. The biosorbent performance was evaluated at different bed heights (15-25 cm) and flow rates (5-15 mL/min). Favorable conditions for Cr biosorption were observed at the highest bed height (25 cm) and lowest flow rate (5 mL/min); at which the Cr uptake and percent removal were recorded as 29.1 mg/g and 63.3%, respectively. Mathematical modeling of column experimental data was performed, using nonlinear forms of the Thomas and modified-dose-response models; with the latter able to describe the breakthrough curves with high-correlation coefficients. © 2010 American Institute of Chemical Engineers.|
|Source Title:||Environmental Progress and Sustainable Energy|
|Appears in Collections:||Staff Publications|
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