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Biosorption of Cr(VI) from Water Using Biomass of Aeromonas hydrophila: Central Composite Design for Optimization of Process Variables

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Abstract

The potential use of biomass of Aeromonas hydrophila for biosorption of chromium from aqueous solution was investigated. The variables (pH, initial Cr(VI) concentration, biomass dose, and temperature) affecting process were optimized by performing minimum number of experimental runs with the help of central composite design. The results predicted by design were found to be in good agreement (R 2 = 99.1%) with those obtained by performing experiments. Multiple regression analysis shows that uptake decreases with increase in pH and biomass dose, whereas it increases with increase in temperature and concentration. The maximum removal of Cr(VI) predicted by contour and optimization plots was 184.943 mg/g at pH 1.5, initial Cr(VI) concentration 311.97 mg/L, temperature 60 °C, and biomass dose 1.0 g. The removal of Cr(VI) was governed by adsorption of Cr(VI) as well as its reduction into Cr(III), which further gets adsorbed. The sorption capacity of biomass was calculated from experimental data using Langmuir sorption model and was found to be 151.50 mg/g at 40 °C and pH 1.5, which is comparable to other biosorbents. In addition to this, Dubinin–Radushkevich model was applied, and it was found that nature of sorption was chemisorption.

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Acknowledgment

The authors are thankful to Institute of Technology, Banaras Hindu University and University Grant Commission (UGC) (F.No. 32-224/2006 (SR)) for laboratory facilities and financial assistance.

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Authors and Affiliations

  1. Water Pollution Research Laboratory, Department of Applied Chemistry, Institute of Technology, Banaras Hindu University, Varanasi, 221 005, India

    D. Ranjan, P. Srivastava & S. H. Hasan

  2. Department of Biochemistry, Faculty of Science, Banaras Hindu University, Varanasi, 221 005, India

    M. Talat

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  1. D. Ranjan
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  2. P. Srivastava
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  4. S. H. Hasan
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Correspondence to S. H. Hasan.

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Ranjan, D., Srivastava, P., Talat, M. et al. Biosorption of Cr(VI) from Water Using Biomass of Aeromonas hydrophila: Central Composite Design for Optimization of Process Variables. Appl Biochem Biotechnol 158, 524–539 (2009). https://doi.org/10.1007/s12010-008-8404-z

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