| The biosorption and desorption of lead by the immobilized biomass of nonliving, dried marine brown alga Hizikia fusiformis by each of Ca-alginate method (Ca-ALG), Ba-alginate method (Ba-ALG), and polyethylene glycol method (YEG), were investigated using the lead concentration of 100-1000㎎/L and the biomass amoiunt of 0.15∼0.6g. As the biomass amount was increased, the lead removal performance increased, but its uptake decreased. The lead uptake by the immobilized biomass increased with increasing initial lead concentration, showed the maximum in the pH range of 4 to about 5, and decreased in the following sequences : Ca-ALG>Ba-ALG>PEG among the immobilization methods. The pattern of lead uptake by the immobilized biomass fitted the Freundlich isotherm better than the Langmuir isotherm. The deposited lead for the immobilized biomass prepared by Ca-ALG and Ba-ALG, was desorbed easily with 0.1-0.5M HCl, with no changes of the immobilized biomass lead uptake capacity and macroscopic appearance in five subsequent biosorption/desorption cycles, except for PEG. |
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