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Licensed Unlicensed Requires Authentication Published by De Gruyter (O) November 6, 2012

Separation of oxidized americium from lanthanides by use of pillared metal(IV) phosphate-phosphonate hybrid materials

J. D. Burns , Marian Borkowski , A. Clearfield and Donald T. Reed
From the journal Radiochimica Acta

Abstract

Closing the nuclear fuel cycle in the US poses many challenges, one of which is found in the waste streams, which contain both trivalent lanthanides and actinides. The separation of americium from the raffinate will dramatically reduce the long-term radiotoxicity of the waste. The sorption of americium in both the tri- and pentavalent oxidation states was observed for four M(IV) phosphate-phosphonate ion exchange materials in nitric acid at pH 2. High selectivity was observed for reduced Am(III) with Kd values ca. 6×105 mL/g, while the Kd values for Am(V) were much lower. A new method of synthesizing and stabilizing AmO2+ to yield a lifetime of at least 24 h in acidic media using a combination of sodium persulfate and calcium hypochlorite will be described.


* Correspondence address: Texas A&M University, Department of Chemistry, College Station, TX 77843-3255, U.S.A.,

Published Online: 2012-11-06
Published in Print: 2012-12

© by Oldenbourg Wissenschaftsverlag, München, Germany

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