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Biosorption of Hg^2^+, Cd^2^+, and Zn^2^+ by Ca-alginate and immobilized wood-rotting fungus Funalia trogii [An article from: Journal of Hazardous Materials]
Description
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Description:
Funalia trogii biomass was immobilized in Ca-alginate gel beads. The live and heat inactivated immobilized forms were used for the biosorption of Hg^2^+, Cd^2^+ and Zn^2^+ ions by using plain Ca-alginate gel beads as a control system. The effect of pH was investigated and the maximum adsorption of metal ions on the Ca-alginate and both live and inactivated immobilized fungal preparations were observed at pH 6.0. The temperature change between 15 and 45^oC did not affect the biosorption capacity. The biosorption of Hg^2^+, Cd^2^+ and Zn^2^+ ions on the Ca-alginate beads and on both immobilized forms was studied in aqueous solutions in the concentration range of 30-600mg/L. The metal biosorption capacities of the heat inactivated immobilized F. trogii for Hg^2^+, Cd^2^+ and Zn^2^+ were 403.2, 191.6, and 54.0mg/g, respectively, while Hg^2^+, Cd^2^+ and Zn^2^+ biosorption capacities of the immobilized live form were 333.0, 164.8 and 42.1mg/g, respectively. The same affinity order on a molar basis was observed for single or multi-metal ions (Hg^2^+>Cd^2^+>Zn^2^+). The Langmuir and the Freundlich type models were found to exhibit good fit to the experimental data. The experimental data were analyzed using the first-order (Langergren equations) and the second order (Ritchie equations). The experimental biosorption capacity with time is found to be best fit the second-order equations. The alginate-fungus system could be regenerated by washing with a solution of hydrochloride acid (10mM). The percent desorption achieved was as high as 97. The biosorbents were reused in five biosorption-desorption cycles without significant loss of their initial biosorption capacity.
Description:
Funalia trogii biomass was immobilized in Ca-alginate gel beads. The live and heat inactivated immobilized forms were used for the biosorption of Hg^2^+, Cd^2^+ and Zn^2^+ ions by using plain Ca-alginate gel beads as a control system. The effect of pH was investigated and the maximum adsorption of metal ions on the Ca-alginate and both live and inactivated immobilized fungal preparations were observed at pH 6.0. The temperature change between 15 and 45^oC did not affect the biosorption capacity. The biosorption of Hg^2^+, Cd^2^+ and Zn^2^+ ions on the Ca-alginate beads and on both immobilized forms was studied in aqueous solutions in the concentration range of 30-600mg/L. The metal biosorption capacities of the heat inactivated immobilized F. trogii for Hg^2^+, Cd^2^+ and Zn^2^+ were 403.2, 191.6, and 54.0mg/g, respectively, while Hg^2^+, Cd^2^+ and Zn^2^+ biosorption capacities of the immobilized live form were 333.0, 164.8 and 42.1mg/g, respectively. The same affinity order on a molar basis was observed for single or multi-metal ions (Hg^2^+>Cd^2^+>Zn^2^+). The Langmuir and the Freundlich type models were found to exhibit good fit to the experimental data. The experimental data were analyzed using the first-order (Langergren equations) and the second order (Ritchie equations). The experimental biosorption capacity with time is found to be best fit the second-order equations. The alginate-fungus system could be regenerated by washing with a solution of hydrochloride acid (10mM). The percent desorption achieved was as high as 97. The biosorbents were reused in five biosorption-desorption cycles without significant loss of their initial biosorption capacity.
