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Adsorption of cesium ion by marine actinobacterium Nocardiopsis sp. 13H and their extracellular polymeric substances (EPS) role in bioremediation

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Abstract

This paper evaluates the cesium adsorption of marine actinobacterium Nocardiposis sp. 13H strain isolated from nuclear power plant sites in India. It could remove 88.6 ± 0.72% of Cs+ from test solution containing 10 mM CsCl2. The biosorption of Cs+ with different environmental factors such as pH, temperature, and time interval is also determined. Scanning electron microscopy coupled with energy dispersive spectroscopy (EDS) confirmed the Cs+ adsorption by Nocardiopsis sp. 13H. Most of the bound cesium was found to be associated extracellular polymeric substances (EPS) suggesting its interaction with the surface active groups. The main component of the EPS was carbohydrate followed by protein and nucleic acid. Further, Fourier transform infrared (FTIR) spectroscopy suggested the carboxyl, hydroxyl, and amide groups on the strain cell surface were likely to be involved in Cs+ adsorption. Results from this study show Nocardiopsis sp. 13H microorganism could be useful in exploring the biosorption of radioisotope pollution and developing efficient and eco-friendly biosorbent for environmental cleanup.

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Acknowledgements

The authors are grateful to Director and Aquatic Radioecology Project Coordinator Dr. A.K. Pal, Former Joint Director, ICAR-CIFE, Deemed University, Mumbai, for providing the facilities to carry out this study and thankful to Board of Research in Nuclear Science (BRNS), Department of Atomic Energy (DAE), Government of India, for providing the financial assistance for this work (CRP—studies on baseline marine radioecology and biodiversity around nuclear power plant site in Jaitapur, Maharashtra, Project No. 2010/36/81-BRNS/dt2/2/11). The authors are also thankful to SRM University, India, for giving moral support. The second author is thankful to the Science and Engineering Research Board—Department of Science and Technology, Govt. of India, for providing fund through a national post-doctoral fellowship program (File No. PDF/2015/000680).

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Correspondence to Pitchiah Sivaperumal.

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Responsible editor: Philippe Garrigues

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Sivaperumal, P., Kamala, K. & Rajaram, R. Adsorption of cesium ion by marine actinobacterium Nocardiopsis sp. 13H and their extracellular polymeric substances (EPS) role in bioremediation. Environ Sci Pollut Res 25, 4254–4267 (2018). https://doi.org/10.1007/s11356-017-0818-0

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  • DOI: https://doi.org/10.1007/s11356-017-0818-0

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