Faculty of Biology, University of Latvia
Hard copy: ISSN 1691–8088
On-line: ISSN 2255–9582
Environ Exp Biol (2019) 17: 97–105
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Environmental and

Environ Exp Biol (2019) 17: 97–105

Orginal Paper

Biosorption of hexavalent chromium by Aspergillus fumigatus S101 isolated from a coal mining environment

Satarupa Dey1*, Swagata Bhattacharya2, Rajyasri Ghosh2, Shampa Bhattacharyya2
1 Agricultural and Ecological Research unit, Indian Statistical Institute, 203 Barrackpore Trunk Road, Kolkata 7000108, India
2 Mycology and plant pathology laboratory, Department of Botany, Scottish Church College, 1 and 3 Urquhart Square, Kolkata 700006, India
* Corresponding author, E-mail: dey1919@gmail.com


In this study attempts were made to isolate a Cr-binding fungal population from coal mine soils of Jharkhand, India. A total of 15 fungal isolates belonging to the genera Aspergillus, Penicillium and Fusarium were obtained from the soils. Among them, Aspergillus fumigatus S101 was found to tolerate up to 5 mM Cr(VI) and showed maximum metal uptake capacity of 1.868 mM g–1 biomass in presence of 0.5 mM Cr(VI) within 48 h. The sorption capacity was standardized following Langmuir and Freundlich absorption isotherm models that followed pseudo-second-order kinetics. The biosorption ability of A. fumigatus S101 was maximum at pH 5 and at 30 °C. There was a decrease in metal uptake capacity with increase in biomass, but with the increase in Cr(VI) concentration metal uptake capacity increased. The sorption capacity increased in presence of metal ions such as Fe(III) and Cu(II) showing complete removal of 0.5 mM Cr(VI) within 36 h. Treatment of biomass with Tween 80 resulted in maximum sorption accounting for 100% removal of 0.5 mM Cr(VI) in 24 h. The results suggested that the mycelial mass of A. fumigatus (S101) is capable of efficient removal of Cr(VI) from aqueous solution.

Key words: absorption isotherm models, Aspergillus fumigatus, coal mine soils, Cr(VI) biosorption.

Environ Exp Biol (2019) 17: 97–105
 DOI: http://doi.org/10.22364/eeb.17.10

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