Abstract
110 mAg, comes from pressurized water reactor units, has become one of the major radionuclides affecting the surrounding environment. The chemical species of 110 mAg are controlled by additives or impurities during operation process of nuclear power plant. Colloidal state (named Ag0) and ionic state are main chemical forms. It is difficult to remove Ag0 by commercial ion exchange resin because the colloidal particles have different sizes and low charge. The oxidative resin loaded with Fe3+ were prepared and used for removal of colloidal Ag from aqueous solution. The influence factors such as resin dosage, adsorption time and initial concentration of Ag0 were investigated through batch experiments. The adsorption efficiency of the oxidative resin towards Ag0 in aqueous solution could reach 92.5% under pH 7. The adsorption process corresponds to the Langmuir adsorption model and pseudo-second-order kinetic equation. XPS analysis clearly shows the presence of binding energy peaks of Fe2+ and Ag+, which indicates the adsorption mechanism towards Ag0 is based on the combined actions of redox and ion exchange.
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Acknowledgements
Thanks to the National Natural Science Foundation of China (Grant No. 11675103, 11975152, 91226111) for financial support.
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Zu, J., Fu, L., Pan, X. et al. The preparation of oxidative resin loaded with Fe3+ and their removal performance for 110 mAg in colloidal form. J Radioanal Nucl Chem 326, 1343–1349 (2020). https://doi.org/10.1007/s10967-020-07404-1
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DOI: https://doi.org/10.1007/s10967-020-07404-1