Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8416497 | Journal of Genetic Engineering and Biotechnology | 2017 | 10 Pages |
Abstract
Heavy metal biosorption is an efficient technology for the decontamination of metal from industrial waste water. The present study focused on exploration of Aspergillus niger towards removal of Cr(VI) from aqueous solution. The influence of different experimental parameters-initial pH, adsorbent dose, initial concentration, contact time, shaking speed, temperature, and their combined effect during Cr(VI) adsorption-was investigated by means of response surface methodology based on four factorial Box-Behnken experimental design. Optimized values of initial Cr(VI) concentration, pH, adsorbent dose, and contact time were found as 33.33Â mg/L, 4.6, 1.0Â g/L, and 48.45Â min, respectively. A. niger showed the highest adsorption capacity 11.792Â mg/g at initial pH 2.0. Equilibrium data fitted well to the Temkin and Freundlich isotherms. Cr(VI) biosorption showed Pseudo-second order rate kinetics. The activation energy of the adsorption was estimated as 2.9Â ÃÂ 10â3Â kJ/mol. Thermodynamics properties of the Cr(VI) biosorption was spontaneous in nature. Desorption study showed that nearly 94% of the Cr(VI) adsorbed on A. niger could be desorbed using 0.5Â M EDTA.
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Authors
Naba Kumar Mondal, Angela Samanta, Shampa Dutta, Soumya Chattoraj,