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Removal of radiocobalt ions from aqueous solutions by natural halloysite nanotubes

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Abstract

In this study, natural halloysite nanotubes (HNTs) were applied to remove radiocobalt from wastewaters under various environmental parameters such as contact time, pH, ionic strength, foreign ions and temperature by using batch technique. The results indicated that the sorption of Co(II) on HNTs was dependent on ionic strength at pH < 8.5 and independent of ionic strength at pH > 8.5. Langmuir and Freundlich models were applied to simulate the sorption isotherms of Co(II) at three different temperatures of 293, 313 and 333 K. Langmuir model fitted the sorption isotherms of Co(II) on HNTs better than Freundlich model. The thermodynamic parameters (ΔG 0, ΔS 0 and ΔH 0) calculated from the temperature-dependent sorption isotherms manifested that the sorption of Co(II) on HNTs was an endothermic and spontaneous process. The sorption of Co(II) was dominated by outer-sphere surface complexation or ion exchange at low pH, whereas inner-sphere surface complexation or precipitation was the main sorption mechanism at high pH. The experimental results show that HNTs have good potentialities for cost-effective disposal of cobalt-bearing wastewaters.

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Acknowledgments

Financial support from the National Science Foundation of China (21071147, 21107115, 21077107, 20971126 and 51062002)) is acknowledged.

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Correspondence to Feng Wen.

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Li, J., Wen, F., Pan, L. et al. Removal of radiocobalt ions from aqueous solutions by natural halloysite nanotubes. J Radioanal Nucl Chem 295, 431–438 (2013). https://doi.org/10.1007/s10967-012-1823-x

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  • DOI: https://doi.org/10.1007/s10967-012-1823-x

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