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Effect of pH, ionic strength, fulvic acid and humic acid on sorption of Th(IV) on Na-rectorite

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Abstract

Sorption of Th(IV) on Na-rectorite as a function of pH, ionic strength, soil humic acid (HA) and fulvic acid (FA) are studied under ambient conditions by using a batch technique. The results indicate that the sorption of Th(IV) on Na-rectorite is not only dependent on medium pH values, but also dependent on medium ionic strength and humic substances. Surface complexation and cation competition exchange account for Th(IV) sorption on Na-rectorite. The sorption of Th(IV) on Na-rectorite decreases with the increase on the concentration of NaNO3, Mg(NO3)2 and Ca(NO3)2, and increases with the increasing amount of HA/FA in the suspension/adsorbed on rectorite. Soil HA/FA enhances the sorption of Th(IV) on rectorite at medium pH<4 drastically, but the presence of FA reduces the sorption of Th(IV) at medium pH>6, and HA has no effect on Th(IV) sorption at medium pH>6. An interpretation for the results is attempted, considering the occurrence of different sorption mechanisms.

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Authors and Affiliations

  1. School of Chemical Engineering, Hefei University of Technology, 230009, Hefei, Anhui, P.R. China

    P. Chang, S. Yu & A. Ren

  2. Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei, 230031, P.R. China

    P. Chang, A. Ren, C. Chen & X. Wang

  3. School of Resource and Environmental Engineering, Hefei University of Technology, 230009, Hefei, Anhui, P.R. China

    T. Chen

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  1. P. Chang
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  2. S. Yu
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  4. A. Ren
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  5. C. Chen
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  6. X. Wang
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Chang, P., Yu, S., Chen, T. et al. Effect of pH, ionic strength, fulvic acid and humic acid on sorption of Th(IV) on Na-rectorite. J Radioanal Nucl Chem 274, 153–160 (2007). https://doi.org/10.1007/s10967-006-6865-5

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  • DOI: https://doi.org/10.1007/s10967-006-6865-5

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