Preparation of ferrocyanide molybdate and their selective uptake properties for palladium and cesium ions

Hitoshi Mimura, Ayumi Asakura, Yan Wu, Yuichi Niibori, Masaki Ozawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The selective separation of heat-generating nuclide (Cs) and platinum group metal (Pd) containing in high-level liquid wastes (HLLW) is an important subject for the advancement of nuclear fuel cycle. Selective uptake of these nuclides was accomplished by using insoluble ferrocyanide molybdates (FeMo-1-4). The uptake properties of Pd2+ and Cs+ for MoFe 1-4 in the presence of 1 M HNO3 were examined by batch method. Relatively high uptake percentages of Pd2+ and Cs+ above 90% were obtained within 30 min. The uptake percentage above 90% was kept in the presence of 0.1-3 M HNO3. The uptake selectivity of Pd2+ was higher than that of Cs+; the separation factor of Pd2+ to Cs + increased with coexisting HNO3 concentration and was estimated to be 15 at 3 M HNO3. The uptake of Pd2+ and Cs+ on FeMo-1-4 followed a Langmuir-type adsorption equation, and the uptake capacities of Pd2+ and Cs+ were estimated to be 0.17-0.28 and 1.68-2.24 mmol/g, respectively. The uptake is mainly governed by the ion-exchange reaction between exchangeable cations (Na+; and K+) and target cations (Pd2+ and Cs2+). Further, the selective uptake of Pd2+ and Cs+ was confirmed by using simulated HLLW (28 components, SW-11, JAEA); the uptake equilibrium attained within 30 min and the uptake percentages of Pd2+ and Cs+ were 99 and 85 %, respectively. In order to granulate the fine powders of FeMo exchangers, the alginate gel polymer was used as an immobilizing matrix for the microencapsulation. The uptake percentages of Pd2+ and Cs+ for FeMo-3 microcapsule were above 80% even in the presence of 3 M HNO3. Thus the molybdate can be converted to the ion-exchanger having high selectivity towards Pd2+ and Cs + in HLLW. This conversion method leads to the volume reduction of wastes and the utilization of useful nuclides.

Original languageEnglish
Title of host publicationSociete Francaise d'Energie Nucleaire - International Congress on Advances in Nuclear Power Plants - ICAPP 2007, "The Nuclear Renaissance at Work"
Pages163-170
Number of pages8
Publication statusPublished - 2008 Sep 26
EventSociete Francaise d'Energie Nucleaire - International Congress on Advances in Nuclear Power Plants - ICAPP 2007, "The Nuclear Renaissance at Work" - Nice, France
Duration: 2007 May 132007 May 18

Publication series

NameSociete Francaise d'Energie Nucleaire - International Congress on Advances in Nuclear Power Plants - ICAPP 2007, "The Nuclear Renaissance at Work"
Volume1

Other

OtherSociete Francaise d'Energie Nucleaire - International Congress on Advances in Nuclear Power Plants - ICAPP 2007, "The Nuclear Renaissance at Work"
CountryFrance
CityNice
Period07/5/1307/5/18

ASJC Scopus subject areas

  • Nuclear Energy and Engineering

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    Mimura, H., Asakura, A., Wu, Y., Niibori, Y., & Ozawa, M. (2008). Preparation of ferrocyanide molybdate and their selective uptake properties for palladium and cesium ions. In Societe Francaise d'Energie Nucleaire - International Congress on Advances in Nuclear Power Plants - ICAPP 2007, "The Nuclear Renaissance at Work" (pp. 163-170). (Societe Francaise d'Energie Nucleaire - International Congress on Advances in Nuclear Power Plants - ICAPP 2007, "The Nuclear Renaissance at Work"; Vol. 1).