Biosorption of heavy metals by lyophilized cells of <Emphasis Type="Italic">Pseudomonas stutzeri</Emphasis> |
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Authors: | Sang Eun Oh Sedky H A Hassan Jin Ho Joo |
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Institution: | (1) Department of Biological Environment, Kangwon National University, 192-1 Hyo-Ja Dong, Chuncheon, 200-701, Korea; |
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Abstract: | Biosorptive capacity of Pb(II), Cd(II) and Cu(II) by lyophilized cells of Pseudomonas stutzeri was investigated based on Langmuir and Freundlich isotherms. Biosorptive capacity for Pb(II), Cd(II) and Cu(II) decreased
with an increase of metal concentration, reaching 142, 43.5 and 36.2 mg/g at initial concentration of 300 mg/l, respectively.
Biosorption capacity for metal ions increased with increasing pH. The optimum pH for biosorption rate of Cd(II) and Cu(II)
were 5.0, and 6.0 for Pb(II) biosorption. The experimental data showed a better fit with the Langmuir model over the Freundlich
model for metal ions throughout the range of initial concentrations. The maximum sorptive capacity (q
max) obtained from the Langmuir equation for Pb(II), Cd(II) and Cu(II) were 153.3 (r
2
= 0.998), 43.86 (r
2
= 0.995), and 33.16 (r
2
= 0.997) for metal ions, respectively. The selectivity order for metal ions towards the biomass of P. stutzeri was Pb(II) > Cd(II) > Cu(II) for a given initial metal ions concentration. The interactions between heavy metals and functional
groups on the cell wall surface of bacterial biomass were confirmed by FTIR analysis. The results of this study indicate the
possible removal of heavy metals from the environment by using lyophilized cells of P. stutzeri. |
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Keywords: | |
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