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Kinetic and equilibrium studies of copper biosorption onto Pseudomonas aeruginosa base using direct determination of copper by a voltammetric method

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Abstract

This paper provided information on the use of linear sweep anodic stripping voltammetry for evaluating the process of copper biosorption onto Pseudomonas aeruginosa. This technique was suited to determine the concentration of free copper ion on site on the mercaptoethane sulfonate modified gold electrode surface without any pretreatment. It was in favor of the study of kinetic process as the fast changing kinetic data characteristic just after the beginning of biosorption could be accurately depicted. Based on the electrochemical results, the kinetics and equilibrium of biosorption were systematically examined. The pseudo-second-order kinetic model was used to correlate the kinetic experimental data and the kinetic parameters were evaluated. The Langmuir and Freundlich models were applied to describe the biosorption equilibrium. It was found that the Langmuir isotherm fitted the experimental data better than the Freundlich isotherm. Maximum adsorption capacity of copper ion onto Pseudomonas aeruginosa was 0.9355 μmol mg−1 (about 59.4417 mg g−1).

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Abbreviations

LSASV:

Linear sweep anodic stripping voltammetry

MES:

Mercaptoethane sulfonate

P. aeruginosa :

Pseudomonas aeruginosa

SCE:

Saturated calomel electrode

AAS:

Atomic absorption spectrometry

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Acknowledgements

The authors gratefully acknowledge the financial support of Specialized Research Found for the Doctoral Program of Higher Education.

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Authors and Affiliations

  1. State Key Laboratory of Chemo/Biosensoring and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan, 410082, P.R. China

    Xuefang Li, Wanzhi Wei, Xiandong Zeng, Jinxiang Zeng, Jian Yin & Ling Wu

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  1. Xuefang Li
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  2. Wanzhi Wei
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  3. Xiandong Zeng
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  4. Jinxiang Zeng
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  5. Jian Yin
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  6. Ling Wu
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Correspondence to Wanzhi Wei.

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Li, X., Wei, W., Zeng, X. et al. Kinetic and equilibrium studies of copper biosorption onto Pseudomonas aeruginosa base using direct determination of copper by a voltammetric method. World J Microbiol Biotechnol 23, 1465–1471 (2007). https://doi.org/10.1007/s11274-007-9391-x

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  • DOI: https://doi.org/10.1007/s11274-007-9391-x

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