| The chromium biosorption performances were investigated and compared using the biomass of nonliving, dried marine brown algae Undaria pinnatifida, Hizikia fusiformis, and Sargassum fulvellum harvested in the sea near Cheju Island. As the biosorbent amount added was increased, the chromium removal performance increased but the chromium uptake decreased. However, the chromium uptakes by the biosorbent materials increased with increasing initial chromium concentration and pH in the range of initial chromium concentration(C_o) of 10-500㎎/L. Among the biosorbent materials in this study, the chromium uptakes decreased in the following sequence: U. pinnatifida > H. fusiformis > S. fulvellum. Equilibrium parameters based on the Langmuir and the Freundlich isotherm were determined. It was found that the chromium uptakes by biosorbent materials followed the Langmuir isotherm better than the Freundlich isotherm. Biosorption rate could be expressed as a fuction of initial chromium concentration like that rad = 5.757C_o/(15.89 + C_o) for U. pinnatifida, r_(ad) = 5.534C_o/(24.87 + C_o) for H. fusiformis, r_(ad) = 3.9496C_o/(24.75 + G_o) for S. fulvellum. Comparing each capability among the biosorbent materials in this study using biosorption isotherms and biosorption rate model, it was considered that U. pinnatifida was the most predominant biosorbent, applicable to the practical biosorption process. |
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