Removal of Cu(II) and Fe(III) from aqueous solutions by dead sulfate reducing bacteria

Abstract

The biosorption properties of dead sulfate reducing bacteria (SRB) for the removal of Cu(II) and Fe(III) from aqueous solutions was studied. The effects of the biosorbent concentration, the initial pH value and the temperature on the biosorption of Cu(II) and Fe(III) by the SRB were investigated. FTIR analysis verified that the hydroxyl, carbonyl and amine functional groups of the SRB biosorbent were involved in the biosorption process. For both Cu(II) and Fe(III), an increase in the SRB biosorbent concentration resulted in an increase in the removal percentage but a decrease in the amount of specific metal biosorption. The maximum specific metal biosorption was 93.25 mg∙g^–1 at pH 4.5 for Cu(II) and 88.29 mg∙g^–1 at pH 3.5 for Fe(III). The temperature did not have a significant effect on biosorption. In a binary metal system, the specific biosorption capacity for the target metal decreased when another metal ion was added. For both the single metal and binary metal systems, the biosorption of Cu(II) and Fe(III) onto a SRB biosorbent was better represented by a Langmuir model than by a Freundlich model.

Keywords

sulfate reducing bacteria / biosorption / Cu(II) / Fe(III)

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Acknowledgements

This study was financially supported by the National Nature Science Foundation of China (Grant No. 21077075).

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg