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Iron(III)
biosorption by Polyporus squamosus
R. Razmovski* and M. Šćiban
Faculty of Technology, University of Novi Sad, Novi Sad,
Serbia.
*Corresponding author.
E-mail:
razmovski@tehnol.ns.ac.yu,
Tel: ++381 21 4853736. Fax: ++381 21 450413.
Accepted 5 January, 2007 |
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Polyporus squamosus
was tested for its ability to absorb Fe(III) ions from
solutions. Kinetic and isotherm sorption experiments were
conducted to evaluate the effects of contact time, pH,
metal concentration, dose of the adsorbent, ionic strength
and glucose. The increases in initial concentration of metal
and pH of the solutions resulted in an increase in iron
uptake. The equilibrium data could be fitted by Langmuir and
Freundlich isotherm equation. Both Langmuir and Freundlich
sorption models adequately describe the biosorption of
Fe(III) by P. squamosus. Maximum metal uptake
capacities of P. sqamosus biomass (qm)
were found as 31.2, 18.1 and 12.2 mg/g for 1.5, 3.3 and 6.6
g biomass/l, respectively. With increasing ionic strength,
there is a decrease in the metal uptake (qm) as
well as coefficient b in Langmuir equation. It was noticed
that lower concentrations of glucose resulted in higher
rates and amounts of Fe(III) adsorption, while its
concentration above 0.1% (w/v) reduced substantially the
ability of the cells to absorb this metal.
Key words:
Biosorption,
Polyporus squamosus,
heavy metals, iron, removal. |
