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Download Hi-Res ImageDownload to MS-PowerPointCite This:Environ. Sci. Technol. 2015, 49, 17, 10398-10405
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Prediction of Intrinsic Cesium Desorption from Na-Smectite in Mixed Cation Solutions

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† Institute of Nature and Environmental Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192 Japan
‡ School of Natural Systems, College of Science and Engineering, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192 Japan
*Phone: +81-76-264-6520; fax: +81-76-264-6545; e-mail: [email protected]
Cite this: Environ. Sci. Technol. 2015, 49, 17, 10398–10405
Publication Date (Web):July 24, 2015
https://doi.org/10.1021/acs.est.5b01884
Copyright © 2015 American Chemical Society
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Abstract

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Quantitative understanding of the stability of sorbed radionuclides in smectite is necessary to assess the performance of engineering barriers used for nuclear waste disposal. Our previous study demonstrated that the spatial organization of the smectite platelets triggered by the divalent cations led to the apparent fixation of intrinsic Cs in smectite, because some Cs is retained inside the formed tactoids. Natural water is usually a mixture of Na+ and divalent cations (Ca2+ and Mg2+). This study therefore investigated the desorption behavior of intrinsic Cs in Na-smecite in mixed Na+-divalent cation solutions under widely various cation concentrations using batch experiments, grain size measurements, and cation exchange modeling (CEM). Results show that increased Na+ concentrations facilitate Cs desorption because Na+ serves as the dispersion agent. A linear relation was obtained between the logarithm of the Na+ fraction and the accessible Cs fraction in smectite. That relation enables the prediction of accessible Cs fraction as a function of solution cationic compositions. The corrected CEM considering the effects of the spatial organization suggests that the stability of intrinsic Cs in the smectite is governed by the Na+ concentration, and suggests that it is almost independent of the concentrations of divalent cations in natural water.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.est.5b01884.

  • Schematic representation of smectite platelet and tactoid (Figure S1). Results from desorption kinetics of Cs (Figure S2).(1) Cs desorption from smectite in NaCl solutions with the modeled curves by assuming different total Cs concentrations (Figure S3).(1) Cs desorption as a function of divalent cations and sodium concentration (Figure S4). Concentrations of Si, and Al and Cs after the desorption experiments (Figure S5). Distribution of grain size measured using a laser diffraction grain size analyzer (Figure S6). Preliminary results of changes of grain size distributions of smectite suspensions with time in the presence of divalent cations (Figure S7). Observed numbers of platelets in tactoids as a function of the exchangeable Na fraction in Na/Ca smectite (Figure S8).(33) Cs concentrations in solution after the desorption experiments in single added divalent cation concentrations with original and modified CEM (Figure S9).(1)(PDF)

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Cited By

This article is cited by 9 publications.

  1. Xiangbiao Yin, Lijuan Zhang, Chenrui Meng, Yusuke Inaba, Xinpeng Wang, Ayako Nitta, Yoshikazu Koma, Kenji Takeshita. Selective removal of radiocesium from micaceous clay for post-accident soil decontamination by temperature-controlled Mg-leaching in a column. Journal of Hazardous Materials 2020, 387 , 121677. https://doi.org/10.1016/j.jhazmat.2019.121677
  2. Petr Belousov, Anna Semenkova, Tolganay Egorova, Anna Romanchuk, Sergey Zakusin, Olga Dorzhieva, Ekaterina Tyupina, Yulia Izosimova, Inna Tolpeshta, Michail Chernov, Victoria Krupskaya. Cesium Sorption and Desorption on Glauconite, Bentonite, Zeolite and Diatomite. Minerals 2019, 9 (10) , 625. https://doi.org/10.3390/min9100625
  3. Kexin Wang, Hui Ma, Shengyan Pu, Chun Yan, Miaoting Wang, Jing Yu, Xiaoke Wang, Wei Chu, Anatoly Zinchenko. Hybrid porous magnetic bentonite-chitosan beads for selective removal of radioactive cesium in water. Journal of Hazardous Materials 2019, 362 , 160-169. https://doi.org/10.1016/j.jhazmat.2018.08.067
  4. Xiangbiao Yin, Nobutake Horiuchi, Satoshi Utsunomiya, Asumi Ochiai, Hideharu Takahashi, Yusuke Inaba, Xinpeng Wang, Toshihiko Ohnuki, Kenji Takeshita. Effective and efficient desorption of Cs from hydrothermal-treated clay minerals for the decontamination of Fukushima radioactive soil. Chemical Engineering Journal 2018, 333 , 392-401. https://doi.org/10.1016/j.cej.2017.09.199
  5. Chad B. Durrant, James D. Begg, Annie B. Kersting, Mavrik Zavarin. Cesium sorption reversibility and kinetics on illite, montmorillonite, and kaolinite. Science of The Total Environment 2018, 610-611 , 511-520. https://doi.org/10.1016/j.scitotenv.2017.08.122
  6. Chan Woo Park, Bo Hyun Kim, Hee-Man Yang, Bum-Kyoung Seo, Kune-Woo Lee. Enhanced desorption of Cs from clays by a polymeric cation-exchange agent. Journal of Hazardous Materials 2017, 327 , 127-134. https://doi.org/10.1016/j.jhazmat.2016.12.037
  7. , Bo Hyun Kim, Chan Woo Park, Hee-Man Yang, Bum-Kyoung Seo, So-Jin Park, Kune-Woo Lee. Effect of Alkyl Length of Cationic Surfactants on Desorption of Cs From Contaminated Clay. Journal of the Nuclear Fuel Cycle and Waste Technology(JNFCWT) 2017, 15 (1) , 27-34. https://doi.org/10.7733/jnfcwt.2017.15.1.27
  8. Chan Woo Park, Bo Hyun Kim, Hee-Man Yang, Bum-Kyoung Seo, Jei-Kwon Moon, Kune-Woo Lee. Removal of cesium ions from clays by cationic surfactant intercalation. Chemosphere 2017, 168 , 1068-1074. https://doi.org/10.1016/j.chemosphere.2016.10.102
  9. Keisuke FUKUSHI. Modelling Sorption Processes of Trace Elements by Earth Surface Materials. Journal of Geography (Chigaku Zasshi) 2017, 126 (3) , 325-341. https://doi.org/10.5026/jgeography.126.325

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