Biosorption of strontium from aqueous solution by fungus Aspergillus terreus.
BACKGROUND
The biosorption characteristics of strontium ions using fungus Aspergillus terreus were investigated. Experimental parameters affecting the biosorption process such as pH, contact time, initial metal concentration, and temperature were studied.
Fungus A. terreus exhibited the highest strontium uptake capacity at 15°C at an initial strontium ion concentration of 876 mg L(-1) and an initial pH of 9. Biosorption capacity increased from 219 to 308 mg g(-1) with a decrease in temperature from 45°C to 15°C at this initial strontium concentration. The equilibrium data fitted very well to the Langmuir adsorption model in the concentration range of strontium ions and at all the temperatures studied.


CONCLUSIONS
Evaluation of the experimental data in terms of biosorption dynamics showed that the biosorption of strontium onto fungus followed the pseudo-second-order dynamics well (R(2) > 0.985). The calculated thermodynamics parameters (-1.64 < ∆G° < -1.93 kJ mol(-1) at temperatures of 45-15°C, ∆H° = -4.83 kJ mol(-1) and ∆S° = -0.01 kJ mol(-1) K(-1)) showed that the biosorption of strontium ions were feasible, spontaneous, and exothermic at the temperature ranges of 15-45°C.
Nuclear Science Research School, Nuclear Science and Technology Research Institute, P.O. Box 14395, 836 Tehran, Iran.
M H
MH
Khani
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Pahlavanzadeh
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K
Alizadeh
D000042:Absorption; D001230:Aspergillus / Q000737:chemistry / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D017550:Spectroscopy, Fourier Transform Infrared; D013324:Strontium / Q000032:analysis / Q000378:metabolism*; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000378:metabolism
D014874:Water Pollutants, Chemical; D013324:Strontium