Kinetics,equilibrium and thermodynamic studies on biosorption of hexavalent chromium by dead fungal biomass of marine Aspergillus niger |
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| Authors: | Yasmin Khambhaty Kalpana Mody Shaik Basha Bhavanath Jha |
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| Affiliation: | 1. Department of Chemistry, Birla Institute of Technology and Science, Pilani-Hyderabad Campus, Jawahar Nagar, Shameerpet Mandal, R.R. Dist 500 078, India;2. Department of Biological Sciences, Birla Institute of Technology and Science, Pilani-Hyderabad Campus, Jawahar Nagar, Shameerpet Mandal, R.R. Dist 500 078, India;1. Department of Chemical Engineering, University of Louisiana at Lafayette, P.O. Box 42291, Lafayette, LA 70504, USA;2. Department of Chemical Engineering, SSN College of Engineering, Chennai 603 110, India;3. Department of Industrial Technology, University of Louisiana at Lafayette, P.O. Box 43636, Lafayette, LA 70504, USA;4. Department of Civil Engineering, University of Louisiana at Lafayette, P.O. Box 42291, Lafayette, LA 70504, USA;5. Energy Institute of Louisiana, University of Louisiana at Lafayette, P.O. Box 42291, Lafayette, LA 70504, USA;1. School of Science, Monash University Malaysia, Jalan Lagoon Selatan, 46150 Bandar Sunway, Petaling Jaya, Selangor, Malaysia;2. School of Chemical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia;1. Environment and Sustainability Department, CSIR-Institute of Minerals and Materials Technology, Bhubaneswar, 751013, Odisha, India;2. School of Biotechnology and School of Chemical Technology, KIIT Deemed to be University, Bhubaneswar, 751024, Odisha, India;3. Department of Biotechnology, North Orissa University, Baripada, 757003, Odisha, India;1. Department of Botany, Garden Campus, Abdul Wali Khan University Mardan Khyber Pakhtunkhwa, Pakistan;2. Department of Microbiology, Garden Campus, Abdul Wali Khan University Mardan Khyber Pakhtunkhwa, Pakistan;3. Department of Agriculture, Garden Campus, Abdul Wali Khan University Mardan Khyber Pakhtunkhwa, Pakistan;4. Department of Environmental Sciences, Garden Campus, Abdul Wali Khan University Mardan Khyber Pakhtunkhwa, Pakistan |
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| Abstract: | Quite a number of reports are available on metal binding capacity of different groups of microorganisms. However, reports on the equilibrium studies on biosorption by marine fungi are quite inadequate. The present study was carried out in a batch system using dead biomass of marine Aspergillus niger for the sorption of Cr(VI). The removal rate of Cr(VI) was increased with a decrease in pH and an increase in Cr(VI) and biomass concentration. A. niger exhibited the highest Cr(VI) uptake of 117.33 mg g?1 of biomass at pH 1.0 in the presence of 400 mg l?1 Cr at 50 °C. Kinetics studies based on fractional power, zero order, first order, pseudo-first order, Elovich, second order and pseudo-second order rate expressions have also been carried out. The experimental data were analyzed using five, two-parameter isotherms (Langmuir, Freundlich, Dubinin–Radushkevich, Temkin and Halsey). It was observed that Langmuir model exhibited the best fit to experimental data. Thermodynamic parameters of the biosorption (ΔG°, ΔH° and ΔS°) were also determined. |
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