HEAVY METALS BIOSORPTION FROM AQUEOUS SOLUTION BY ...

88
Sławomir Wierzba
The experiment results of Cu(II) and Zn(II) biosorption and desorption are reported in
Table 1. Desorption efficiency of Cu(II) and Zn(II) by living cells was 76.3 and 68.4%
under 0.1 M HCl and it was 93.1 and 86.5% by non-living cells, respectively. It indicates
that 0.1 M HCl can effectively desorbs the bound Cu(II) and Zn(II) from non-living cells,
but not very effective for living cells. And the desorption of Cu(II) is more effective than
that of Zn(II). It also may be due to the living cells uptake a part of Cu(II) and Zn(II)
through intracellular accumulation, since it is possible to remove metals from cell surfaces
after biosorption but not bioaccumulation [6].
Conclusions
Results of this study demonstrated that the binding capacity of living cells is
significantly higher than that of non-living cells at tested conditions. It was also found that
0.1 M HCl can effectively desorb the bound Cu(II) and Zn(II) from non-living cells, but not
very effective for living cells. The results of biosorption time and desorption experiments
suggested that Cu(II) and Zn(II) uptake by the living cells might be enhanced by
intracellular accumulation.
The results suggest that Pseudomonas sp. G1 is a potential adsorbing media for metals
in the treatment of wastewater containing Cu(II) and Zn(II). So this bacterium may be
employed for metal remediation in simple reactors or even in situ.
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