TY - JOUR
T1 - Palladium removal from the simulated nuclear spent fuel solution using a silica-based SiPyR-N3 anion exchanger
AU - Zhang, Anyun
AU - Wei, Yuezhou
AU - Arai, Tsuyoshi
AU - Kumagai, Mikio
N1 - Funding Information:
This work is a part of the results from “Development of the ERIX Process for Reprocessing Spent FBR-MOX Fuel (FY-2001, FY-2002, FY-2003)” entrusted to Institute of Research and Innovation (IRI) by the Ministry of Education, Culture, Sports, Science, and Technology of Japan (MEXT).
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2006
Y1 - 2006
N2 - The ERIX process consists of electroreduction and anion exchange for reprocessing spent nuclear fuels, in which Pd removal from spent fuel solution is necessary in the first step, since Pd can deposit at the electrode in the metallic state and interfere with the electroreduction. In the present work, the possibility in selective removal of Pd using a porous silica-supported anion exchanger, SiPyR-N3, containing a pyridine group has been studied. Adsorption behavior of Pd(II) from a simulated solution using a SiPyR-N3 packed column has been investigated. The elution of Pd(II) using 0.05 M DTPA and 0.2 M thiourea was examined and compared. The SiPyR-N3 resin showed a significantly strong adsorption for Pd(II) from HNO3 solution. The unique adsorption was considered to result from the complex formation between Pd(II) and the resin which contains the soft-atom N with a lone pair of electrons. U(VI) and some typical simulated fission products, La(III), Pr(III), and Sr(II), showed almost no or very weak adverse impact on the Pd(II) separation, except for Re(VII) and Ru(III). The results of column experiments demonstrated that the Pd can be selectively removed from the nuclear spent fuel solution, though further work is needed to improve Pd elution.
AB - The ERIX process consists of electroreduction and anion exchange for reprocessing spent nuclear fuels, in which Pd removal from spent fuel solution is necessary in the first step, since Pd can deposit at the electrode in the metallic state and interfere with the electroreduction. In the present work, the possibility in selective removal of Pd using a porous silica-supported anion exchanger, SiPyR-N3, containing a pyridine group has been studied. Adsorption behavior of Pd(II) from a simulated solution using a SiPyR-N3 packed column has been investigated. The elution of Pd(II) using 0.05 M DTPA and 0.2 M thiourea was examined and compared. The SiPyR-N3 resin showed a significantly strong adsorption for Pd(II) from HNO3 solution. The unique adsorption was considered to result from the complex formation between Pd(II) and the resin which contains the soft-atom N with a lone pair of electrons. U(VI) and some typical simulated fission products, La(III), Pr(III), and Sr(II), showed almost no or very weak adverse impact on the Pd(II) separation, except for Re(VII) and Ru(III). The results of column experiments demonstrated that the Pd can be selectively removed from the nuclear spent fuel solution, though further work is needed to improve Pd elution.
KW - ERIX process
KW - Pd removal
KW - Porous silica-based anion exchanger
KW - Spent nuclear fuel
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U2 - 10.1080/07366290600646913
DO - 10.1080/07366290600646913
M3 - Article
AN - SCOPUS:33646847311
VL - 24
SP - 447
EP - 462
JO - Solvent Extraction and Ion Exchange
JF - Solvent Extraction and Ion Exchange
SN - 0736-6299
IS - 3
ER -