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Sorption of Eu(III) on GMZ bentonite in the absence/presence of humic acid studied by batch and XAFS techniques

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Abstract

Bentonite has been extensively studied because of its strong sorption ability and low permeability. In this work, the Na-bentonite from Gaomiaozi County (China) has been characterized by XRD, FTIR and acid-base titration. The sorption of Eu(III) on Na-bentonite in the absence/presence of humic acid (HA) was studied at T = 25 ± 2 °C and in 0.01 mol/L NaClO4 solution. The effects of pH, HA, contact time and initial Eu(III) concentrations were also investigated. The results indicate that the sorption of Eu(III) on Na-bentonite was dependent on pH values. The presence of HA had little effect on Eu(III) sorption at low pH values, but decreased Eu(III) sorption at high pH values. X-ray absorption fine structure spectroscopy (XAFS) was applied to characterize the local structural environment of the adsorbed Eu(III) on bare Na-bentonite and HA-bentonite hybrids. The results indicate that Eu(III) was bound to O atoms at a distance of about 2.39 Å at pH 4.15. The results are crucial for the evaluation of the sorption and migration of other trivalent lanthanides and actinides in bentonite as backfill materials.

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Authors and Affiliations

  1. Key Laboratory of Novel Thin Film Solar Cells; Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, 230031, China

    Jun Hu, GuoDong Sheng, ChangLun Chen, JiaXing Li & XiangKe Wang

  2. School of Nuclear Science and Engineering, North China Electric Power University, Beijing, 102206, China

    Jun Hu & YiXue Chen

  3. National Synchrotron Radiation Laboratory, University of Science & Technology of China, Hefei, 230029, China

    Zhi Xie & Bo He

Authors
  1. Jun Hu
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  2. Zhi Xie
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  3. Bo He
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  4. GuoDong Sheng
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  5. ChangLun Chen
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  6. JiaXing Li
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  7. YiXue Chen
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  8. XiangKe Wang
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Correspondence to XiangKe Wang.

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Hu, J., Xie, Z., He, B. et al. Sorption of Eu(III) on GMZ bentonite in the absence/presence of humic acid studied by batch and XAFS techniques. Sci. China Chem. 53, 1420–1428 (2010). https://doi.org/10.1007/s11426-010-3064-6

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  • DOI: https://doi.org/10.1007/s11426-010-3064-6

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