The Effect of Gamma Irradiation on the Ion Exchange Properties of Caesium-Selective Ammonium Phosphomolybdate-Polyacrylonitrile (AMP-PAN) Composites under Spent Fuel Recycling Conditions
The Effect of Gamma Irradiation on the Ion Exchange Properties of Caesium-Selective Ammonium Phosphomolybdate-Polyacrylonitrile (AMP-PAN) Composites under Spent Fuel Recycling Conditions
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DOI：
10.3390/separations6020023
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发表时间：
2019-06-01
期刊：
影响因子：
2.6
通讯作者：
Edge, Ruth
中科院分区：
文献类型：
--
作者：
Holdsworth, Alistair E.;Eccles, Harry;Edge, Ruth
铯放射性同位素Cs-134、Cs-135和Cs-137是核裂变过程中产生的非常有问题的中寿命物质，因为它们具有高放射性和环境流动性。虽然许多离子交换材料可以很容易地从中性或碱性水溶液中分离Cs+离子，但只有磷钼酸铵（AMP）在酸性条件下有效地起作用，甚至可以将铯去除到痕量水平。AMP在多孔聚合物载体如聚丙烯腈（PAN）中的复合物可用于从酸性水溶液去污液以及其它液体废物中选择性地去除Cs+离子，并且有望用于乏燃料后处理中Cs+同位素的分离。虽然AMP和PAN都具有可证明的酸稳定性，并且PAN具有已知的抗γ辐射性，但是AMP-PAN复合材料在辐照后仅接受了对其物理化学和离子交换性能的有限分析。在这篇文章中，我们探讨了高水平的γ射线照射对AMP和AMP-PAN作为乏燃料溶解器液体浓度和酸度下的Cs+选择性吸附剂的离子交换性能的影响。我们证明，在辐照后，吸收动力学或容量方面的性能没有显著降低，遵守在已建立的文献中观察到的相同吸收机制。
The caesium radioisotopes Cs-134, Cs-135, and Cs-137 are highly problematic medium-lived species produced during nuclear fission, due to their high radioactivity and environmental mobility. While many ion exchange materials can readily isolate Cs+ ions from neutral or basic aqueous solutions, only ammonium phosphomolybdate (AMP) functions effectively in acidic conditions, removing caesium even down to trace levels. Composites of AMP in a porous polymeric support such as polyacrylonitrile (PAN) can be used to selectively remove Cs+ ions from acidic aqueous decontamination liquors as well as other liquid wastes, and are promising for the isolation of Cs+ isotopes in spent fuel reprocessing. While both AMP and PAN have demonstrable acid stability, and PAN has known resistance to gamma radiation, AMP-PAN composites have received only a limited analysis of their physiochemical and ion exchange performance following irradiation. In this publication, we explore the effect of high levels of gamma irradiation on the ion exchange properties of AMP and AMP-PAN as a Cs+-selective adsorbent under spent fuel dissolver liquor concentrations and acidity. We demonstrate no significant reduction in performance with respect to uptake kinetics or capacity upon irradiation, abiding by the same absorption mechanism observed in the established literature.