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Open AccessArticle

The Effect of Gamma Irradiation on the Ion Exchange Properties of Caesium-Selective Ammonium Phosphomolybdate-Polyacrylonitrile (AMP-PAN) Composites under Spent Fuel Recycling Conditions

1
School of Chemistry, University of Manchester, Manchester M13 9PL, UK
2
School of Physical Sciences and Computing, University of Central Lancashire, Preston PR1 2HE, UK
3
Dalton Cumbrian Facility, University of Manchester, Moor Row, Whitehaven CA24 3HA, UK
*
Author to whom correspondence should be addressed.
Separations 2019, 6(2), 23; https://doi.org/10.3390/separations6020023
Received: 1 February 2019 / Revised: 19 March 2019 / Accepted: 11 April 2019 / Published: 24 April 2019
(This article belongs to the Special Issue Novel Polymeric Materials for Application in Liquid Phase Separations)
The caesium radioisotopes 134Cs, 135Cs, and 137Cs 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. View Full-Text
Keywords: AMP-PAN; ion-exchange; composites; chromatographic separation; fission product; caesium; spent fuel reprocessing; waste management; radiation effects AMP-PAN; ion-exchange; composites; chromatographic separation; fission product; caesium; spent fuel reprocessing; waste management; radiation effects
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Holdsworth, A.F.; Eccles, H.; Rowbotham, D.; Bond, G.; Kavi, P.C.; Edge, R. The Effect of Gamma Irradiation on the Ion Exchange Properties of Caesium-Selective Ammonium Phosphomolybdate-Polyacrylonitrile (AMP-PAN) Composites under Spent Fuel Recycling Conditions. Separations 2019, 6, 23.

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