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Sorption of radiocobalt on a novel γ-MnO2 hollow structure: effects of pH, ionic strength, humic substances and temperature

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Abstract

A novel γ-MnO2 hollow structure has been synthesized using a simple chemical reaction between MnSO4 and KMnO4 in aqueous solution without using any templates, surfactants, catalysts, calcination and hydrothermal processes. As an example of potential applications, γ-MnO2 hollow structure was used as adsorbent in radionuclide 60Co(II) treatment, and showed an excellent ability. The effect of pH, contact time, ionic strength, humic acid (HA)/fulvic acid (FA), and temperature was investigated using batch techniques. The results indicated that the sorption of 60Co(II) on γ-MnO2 was obviously dependent on pH values but independent of ionic strength. The presence of HA/FA enhanced the sorption of 60Co(II) on γ-MnO2 at low pH, whereas reduced 60Co(II) sorption on γ-MnO2 at high pH. The kinetic sorption of 60Co(II) on γ-MnO2 can be well fitted by the pseudo-second-order rate equation. The thermodynamic parameters (ΔH 0, ΔS 0, ΔG 0) were also calculated from the temperature dependent sorption isotherms, and the results suggested that the sorption of 60Co(II) on γ-MnO2 was a spontaneous and endothermic process. The sorption of 60Co(II) on γ-MnO2 was attributed to surface complexation rather than ion exchange.

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Acknowledgment

This work was financially supported by the Award Fund for Prominent Youth Scientists of Shandong Province of China (Project No. BS 2009DX014).

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Authors and Affiliations

  1. School of Physics Science and Information Engineering, Liaocheng University, 252059, Liaocheng, People’s Republic of China

    Juan Mou, Guoju Wang & Wenxian Shi

  2. School of Nuclear Science and Technology, Lanzhou University, 73000, Lanzhou, People’s Republic of China

    Shouwei Zhang

Authors
  1. Juan Mou
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  2. Guoju Wang
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  3. Wenxian Shi
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  4. Shouwei Zhang
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Correspondence to Shouwei Zhang.

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Mou, J., Wang, G., Shi, W. et al. Sorption of radiocobalt on a novel γ-MnO2 hollow structure: effects of pH, ionic strength, humic substances and temperature. J Radioanal Nucl Chem 292, 293–303 (2012). https://doi.org/10.1007/s10967-011-1408-0

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  • DOI: https://doi.org/10.1007/s10967-011-1408-0

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