Abstract
Cesium sorption on Czech Ca/Mg bentonite was studied using the batch technique for a wide range of both bentonite-to-water ratios (m/V) and initial concentrations of Cs. The experiments revealed non-linear pattern of cesium sorption, which was substantially influenced by the m/V. The results of the exchange reaction between added Cs+ and Mg2+, Ca2+, Na+ and K+ ions present naturally on the bentonite sorption sites enabled to determine the appropriate selectivity coefficients. The capacity of sites with higher selectivity to cesium, which is believed to be associated with the frayed-edge sites, was measured using the AgTU method.
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References
Comans RNJ, Hockley D (1992) Kinetics of cesium sorption on illite. Geochim Cosmochim Acta 56:1157–1164
Poinssot Ch, Baeyens B, Bradbury MH (1999) Experimental and modelling studies of caesium sorption on illite. Geochim Cosmochim Acta 63(19/20):3217–3227
Klika Z, Kraus L, Vopálka D (2007) Cesium uptake from aqueous solutions by bentonite: a comparison of multicomponent sorption with ion-exchange models. Langmuir 23:1227–1233
Kraus L, Klika Z, Vopálka D (2006) Modelling of cesium transport through sand–bentonite mixtures. Czechoslov J Phys 56(Suppl. D):D111–D118
Gaines GI, Thomas HC (1953) Adsorption studies on clay minerals. II. A formulation of the thermodynamics of exchange adsorption. J Chem Phys 21:714–718
Parkhurst DL, Appelo CAJ (1999) User’s guide to PHREEQC (version 2)-A computer program for speciation, batch-reaction, one-dimensional transport, and inverse geochemical calculations. Water-Resources Investigations Report 99-4259, U.S. Geological Survey, Denver
Ammann L, Bergaya F, Lagaly G (2005) Determination of the cation exchange capacity of clays with copper complexes revisited. Clay Miner 40:441–453
Ma Ch, Eggleton RA (1999) Cation exchange capacity of kaolinite. Clays Clay Miner 47:174–180
de Koning A, Konoplev AV, Comans RNJ (2007) Measuring the specific caesium sorption capacity of soils, sediments and clay minerals. Appl Geochem 22:219–229
Khan SA, Riaz-ur-Rehman Khan MA (1994) Sorption of cesium on bentonite. Waste Manag 14(7):629–642
Bradbury MH, Baeyens B (2000) A generalised sorption model for the concentration dependent uptake of caesium by argillaceous rocks. J Contam Hydrol 42:141–163
Meier LP, Kahr G (1999) Determination of the exchange capacity (CEC) of clay minerals using the complexes of copper (II) ion with triethylenetetramine and tetraethylenepentamine. Clays Clay Miner 47:386–388
Ochs M, Lothenbach B, Wanner H, Sato H, Yui M (2001) An integrated sorption–diffusion model for the calculation of consistent distribution and diffusion coefficient in compacted bentonite. J Contam Hydrol 47:283–296
Zachara M, Smith SC, Liu Ch, McKinley JP, Serne RJ, Gassman PL (2002) Sorption of Cs+ to micaceous subsurface sediments from the Hanford site, USA. Geochim Cosmochim Acta 66:193–211
Oorts K, Vanlauwe B, Pleysier J, Merckx R (2004) A new method for the simultaneous measurement of pH-dependent cation exchange capacity and pH buffering capacity. Soil Sci Soc Am J 68:1578–1585
Yu J-W, Neretnieks I (1997) Diffusion and sorption properties of radionuclides in compacted bentonite. Report SKB TR 97-12, Stockholm
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This research was supported by the Ministry of Industry and Trade of the Czech Republic under contract FR-TI1/362 and by SURAO.
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Vopálka, D., Gondolli, J., Drtinová, B. et al. Cesium uptake by Ca/Mg bentonite: evaluation of sorption experiments by a multicomponent two-site ion-exchange model. J Radioanal Nucl Chem 304, 429–434 (2015). https://doi.org/10.1007/s10967-014-3884-5
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DOI: https://doi.org/10.1007/s10967-014-3884-5