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- W3007407374 abstract "Abstract Thirty liters of highly acidic spent nuclear fuel solutions need to be disposed at the “Hot Laboratory (hotlab)” facility in Paul Scherrer Institut (PSI), Switzerland. In order to significantly reduce the γ dose rate before proper disposal treatment, 137 Cs must be removed. In the here presented sub-project, the ion-exchange method was evaluated. Two promising sorbents, CLEVASOL ® and AMP (ammonium molybdophosphate), and two derived products AMP_PAN (AMP immobilized in polyacrylonitrile) and AMP/SiO 2 (AMP immobilized on silica gel) were tested by the batch method using model solutions of important high-yield fission products (Cs, Eu, Zr, Ru, Pd and Ag), as well as U and Pu. The results showed that AMP, AMP/SiO 2 and AMP_PAN have higher selectivity for Cs than CLEVASOL ® in 0.1–8 M (mol/L) HNO 3 solutions. 4 M HNO 3 solution was identified as the most suitable condition for Cs-removal with AMP, AMP_PAN and AMP/SiO 2 due to the still sufficiently high separation factor of Cs from other metal ions and an acceptable volume increase factor after dilution. The follow-up kinetic studies on AMP, AMP_PAN and AMP/SiO 2 indicated that although Cs exchange on AMP and AMP/SiO 2 is faster than on AMP_PAN in the first 5 min, they all nearly reach equilibrium after 30 min of contacting time. The isotherm curves of Cs adsorption on AMP, AMP_PAN and AMP/SiO 2 in 4 M HNO 3 showed that the maximum sorption capacity of Cs is reached asymptotically. The results from Langmuir isotherm modeling agree with results from other publications." @default.
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- W3007407374 date "2020-02-24" @default.
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- W3007407374 title "Selective Cs-removal from highly acidic spent nuclear fuel solutions" @default.
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- W3007407374 doi "https://doi.org/10.1515/ract-2019-3187" @default.
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