Abstract
Sorption/desorption experiments in batch and continous flow-through stirred reactor under different experimental conditions were carried out using montmorillonite (<2 μm clay fractions). The Sr2+ amount desorbed at pH 4 is only half of the amount desorbed at pH 8, revealing that the retention of Sr2+ onto montmorillonite was enhanced at pH 4. The largest adsorption value was obtained at pH 8.0 ([KNO3] = 10−3 mol/L) with q m = 41.49 mg Sr2+/g from the Langmuir isotherm. The gradient of concentration acted as an increasing driving force since the amount of Sr2+ adsorbed increased as increasing of Sr2+ concentration during the flow-through experiments.
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Acknowledgments
This is a contribution of KADRWaste PTDC/CTE-GEX/82678/2006 with finnancial support from the National Foundation of Science and Technology—Lisbon, Portugal. The first author thank to FCT-Lisbon for the PhD scholarship (SFRH/BD/79969/2011). The authors thank to two anonymous reviewers for comments and suggestions.
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Guimarães, V., Azenha, M., Rocha, F. et al. Influence of pH, concentration and ionic strength during batch and flow-through continuous stirred reactor experiments of Sr2+-adsorption onto montmorillonite. J Radioanal Nucl Chem 303, 2243–2255 (2015). https://doi.org/10.1007/s10967-014-3709-6
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DOI: https://doi.org/10.1007/s10967-014-3709-6