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Application of non-linear heterogeneity-based isotherm models for characterizing sorption of Cs and Se on mudrocks

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Abstract

It plays a very important role for characterizing sorption behaviors of cesium (Cs) and selenium (Se) on Taiwanese mudrocks to retard the migration of radionuclides from a radioactive waste repository. In this study, two non-linear heterogeneity-based isotherms, Langmuir–Freundlich model (LF) and generalized-Freundlich model (GF), were applied for the evaluation of the sorption characteristics of Cs and Se on Taiwanese mudrocks. The batch sorption experiments were carried out and the experimental data were simulated by LF and GF heterogeneity-based isotherm models. In addition, the results showed that both of the LF and GF models could fit the experimental data more perfectly than the Langmuir one. The heterogeneity of sorption behaviors for Cs and Se could be well characterized by the LF and GF models from the root mean square error calculation and plot of the affinity spectrum. The results demonstrated that the sorption mechanism of Cs and Se on mudrock is quite different and Cs sorption is more heterogeneous and complicated than that in Se.

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Acknowledgments

This work was mainly supported by the Ministry of Education, Taiwan, R.O.C. under the NCKU Aim for the Top University Project Promoting Academic Excellence & Developing World Class Research Centers. The experimental section of this study was supported by National Science Council (NSC, Taiwan) under the contract number of 101-2914-I-006-009-A1 and Institute of Nuclear Energy Research (INER, Taiwan) through 2012 mutual project of Graduate student program.

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Authors and Affiliations

  1. Department of Earth Sciences, National Cheng Kung University, Tainan, 70101, Taiwan

    Chuan-Pin Lee, Ming-Chee Wu & Chun-Hua Pan

  2. Department of Chemical and Materials Engineering, National Central University, Taoyuan, 32001, Taiwan

    Ching-Yuan Liu

  3. Chemistry Divisions, Institute of Nuclear Energy Research, Longtan, 32546, Taiwan

    Tsuey-Lin Tsai, Tzung-Yi Lin, Hwa-Jou Wei & Lee-Chung Men

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  1. Chuan-Pin Lee
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  2. Ching-Yuan Liu
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  3. Ming-Chee Wu
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  4. Chun-Hua Pan
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  5. Tsuey-Lin Tsai
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Correspondence to Ming-Chee Wu.

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Lee, CP., Liu, CY., Wu, MC. et al. Application of non-linear heterogeneity-based isotherm models for characterizing sorption of Cs and Se on mudrocks. J Radioanal Nucl Chem 298, 749–754 (2013). https://doi.org/10.1007/s10967-013-2458-2

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  • DOI: https://doi.org/10.1007/s10967-013-2458-2

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