Isolation, identification, Pb(II) biosorption isotherms and kinetics of a leadadsorbing Penicillium sp. MRF-1 from South Korean mine soil
Natarajan Velmurugan , Grim Hwang , Muthuswamy Sathishkumar , Tae Kie Choi , Kui-Jae Lee , Byung-Taek Oh , Yang-Soo Lee
DOI:
Received August 17, 2009,Revised December 24, 2009, Accepted , Available online
Volume 22,2010,Pages 1049-1056
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A heavy metal contaminated soil sample collected from a mine in Chonnam Province of South Korea was found to be a source
of heavy metal adsorbing biosorbents. Chemical analyses showed high contents of lead (Pb) at 357 mg/kg and cyanide (CN) at 14.6
mg/kg in the soil. The experimental results showed that Penicillium sp. MRF-1 was the best lead resistant fungus among the four
individual metal tolerant fungal species isolated from the soil. Molecular characterization of Penicillium sp. MRF-1 was determined
using ITS regions sequences. E ects of pH, temperature and contact time on adsorption of Pb(II) by Penicillium sp. MRF-1 were
studied. Favorable conditions for maximum biosportion were found at pH 4 with 3 hr contact time. Biosorption of Pb(II) gradually
increased with increasing temperature. E cient performance of the biosorbent was described using Langmuir and Freundlich isotherms.
Adsorption kinetics was studied using pseudo first-order and pseudo second-order models. Biosorbent Penicillium sp. MRF-1 showed
the maximum desorption in alkali conditions. Consistent adsorption/desorption potential of the biosorbent in repetitive cycles validated
the e cacy of it in large scale. SEM studies given notes on surface modification of fungal biomass under metal stress and FT-IR results
showed the presence of amino groups in the surface structure of the biosorbent. In conclusion, the new biosorbent Penicillium sp.
MRF-1 may potentially be used as an inexpensive, easily cultivatable material for the removal of lead from aqueous solution.
