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Sorption of Copper(II) and Silver(I) by Four Bacterial Exopolysaccharides

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Abstract

Metal remediation was studied by the sorption of analytical grade copper Cu(II) and silver Ag(I) by four exopolysaccharides (EPS) produced by marine bacteria. Colorimetric analysis showed that these EPS were composed of neutral sugars, uronic acids (>20 %), acetate, and sulfate (29 %). Metal sorption experiments were conducted in batch process. Results showed that the maximum sorption capacities calculated according to Langmuir model were 400 mg g−1 EPS (6.29 mmol g−1) and 333 mg g−1 EPS (3.09 mmol g−1) for Cu(II) and Ag(I), respectively. Optimum pH values of Ag(I) sorption were determined as 5.7. Experiment results also demonstrated the influence of initial silver concentration and EPS concentrations. Microanalyzing coupled with scanning electron microscopy demonstrated the presence of metal and morphological changes of the EPS by the sorption of metallic cations. The Fourier transform infrared spectroscopy analysis indicated possible functional groups (e.g., carboxyl, hydroxyl, and sulfate) of EPS involved in the metal sorption processes. These results showed that EPS from marine bacteria are very promising for copper and silver remediation. Further development in dynamic and continuous process at the industrial scale will be established next.

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Acknowledgments

The authors extend their gratitude to Mexel Industries SAS for the financial support and Ifremer for the facilities. The authors are thankful to Prof. G. Geesey for providing EPS M2. We also thank Mr. N. Gayet from REM/EEP/LEP Ifremer Brest Center for his skilled assistance with SEM and Mrs. C. Liorzou from UMR 6538 Domaines Océaniques IUEM for metal analysis on ICP-AES.

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Authors and Affiliations

  1. Mexel Industries SAS, Route de Compiègne, 60410, Verberie, France

    M. Deschatre

  2. Institut Français de Recherche pour l’Exploitation de la Mer, RBM/BMM, Centre de Brest, Pointe du Diable, 29280, Plouzané, France

    M. Deschatre & C. Simon Colin

  3. Ecotox, 11 rue Principale, 62380, Affringues, France

    F. Ghillebaert

  4. AiMB: Advices in Marine Biotechnology, 29280, Plouzané, France

    J. Guezennec

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  1. M. Deschatre
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Correspondence to M. Deschatre.

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Deschatre, M., Ghillebaert, F., Guezennec, J. et al. Sorption of Copper(II) and Silver(I) by Four Bacterial Exopolysaccharides. Appl Biochem Biotechnol 171, 1313–1327 (2013). https://doi.org/10.1007/s12010-013-0343-7

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