Selective uptake of palladium from high-level liquid wastes by hybrid microcapsules enclosed with insoluble ferrocyanides

Hitoshi Mimura, Takashi Sakakibara, Wu Yan, Yuichi Niibori, Shin Ichi Koyama, Takashi Ohnishi

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

2 Citations (Scopus)

Abstract

Fine crystalline powders of KCuFC were immobilized with alginate gel polymers by sol-gel methods. The uptake properties of KCuFC-microcapsules (KCuFC-MC) were examined by batch and column methods. The size of KCuFC-MC particle was estimated to be about 1 mm in diameter, and KCuFC powders were uniformly dispersed in KCuFC-MC particles. The uptake rate of Pd2+ for KCuFC-MC was attained within 3 d, and the uptake of Pd2+ was found to be independent of the temperature and coexisting HNO3 concentration. As for the breakthrough properties of Pd2+ through a column packed with KCuFC-MC, a breakpoint of 5% breakthrough was enhanced with lowering of flow rate and independent of coexisting HNO3 concentration. The Pd2+ ions were selectively adsorbed in the KCuFC crystal phase, while other metal ions such as Ru(NO)3+ and ZrO 2+ were absorbed in the alginate phase. High uptake percentage of 98.6% was obtained by using the dissolved solutions of spent fuel from FBR-JOYO (119 GWd/t, JAEA). The alginate film enclosing KZnFC was further prepared by using the support of cellulose filter paper, where the Pd2+ ions were selectively adsorbed on the KZnFC-MC film. The alginate film enclosing insoluble ferrocyanides are predicted for the selective separation of Pd 2+ as an ionexchange filter. Thus, the microcapsules enclosing insoluble ferrocyanides are effective for the selective separation of Pd 2+ from high-level liquid waste (HLLW).

Original languageEnglish
Title of host publicationASME 2010 13th International Conference on Environmental Remediation and Radioactive Waste Management, ICEM2010
Pages265-272
Number of pages8
DOIs
Publication statusPublished - 2010 Dec 1
EventASME 2010 13th International Conference on Environmental Remediation and Radioactive Waste Management, ICEM2010 - Tsukuba, Japan
Duration: 2010 Oct 32010 Oct 7

Publication series

NameProceedings of the International Conference on Radioactive Waste Management and Environmental Remediation, ICEM
Volume2

Other

OtherASME 2010 13th International Conference on Environmental Remediation and Radioactive Waste Management, ICEM2010
CountryJapan
CityTsukuba
Period10/10/310/10/7

Keywords

  • FBR-JOYO
  • Filter
  • Insoluble ferrocyanides
  • Microcapsule
  • Palladium
  • Selective uptake
  • Sol-gel methods

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Energy Engineering and Power Technology
  • Waste Management and Disposal

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