Chromatographic separation of Cs in simulated high-level liquid wastes

Takuya Kawamura, Takashi Ohnishi, Rana Syed Masud, Yan Wu, Hitoshi Mimura, Yuichi Niibori

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)

Abstract

Spherical and elastic AWP-CaALG microcapsules (∼700 m in diameter) were obtained and fine crystals of AWP were uniformly immobilized in alginate matrices. The uptake of Cs+, Rb+ and Ag+ in 2 M HNO3 for AWP-CaALG was examined by batch method. The uptake of Cs+ was fairly fast in the initial stage and the uptake equilibrium attained within 5 h. The decreasing order of Kd was Cs+ > Rb+ > Ag+, and the separation factors of Cs/Rb and Cs/Ag were estimated to be over 10, suggesting the selective separation of Cs+. The KdCs value was almost constant over 10 3 cm3/g in the wide concentration range of HNO3 up to 5 M. The uptake (%) of Cs+ in simulated HLLW (SHLLW, 28 components solution, SW-11E, JAEA) was estimated to be 97%, and the distribution of Cs+ into AWP phase and Zr/Ru to alginate phase were observed by EDS analysis. The stepwise chromatographic separation of Cs+ in SHLLW was examined under different eluting conditions using the columns packed with AWP-CaALG xerogels. The stepwise elution conditions were as follows; (1) H 2O→1 M HNO3→5 M HNO3→3 M NH 4NO3→5 M NH4NO3 (25°C), (2) H2O→3 M NH4NO3 (25°C), (3) H 2O→1 M NH4NO3→5 M NH 4NO3 (25°C), (4) H2O→1 M NH 4NO3→ 5 M NH4NO3 (40°C), (5) H2O→1 M NH4NO3→5 M NH 4Cl (25°C). Most effective separation of Cs+ was accomplished under the condition of (3); most of the Rb+ and Ag + ions over 90% were eluted by 1 M NH4NO3, and Cs+ ions eluted by 5 M NH4NO3. The recovery ratio was estimated to be 73.4%. The AWP-CaALG xerogel column is thus effective for the selective separation and recovery of Cs+ from SHLLW.

Original languageEnglish
Pages (from-to)328-336
Number of pages9
JournalEnergy Procedia
Volume39
DOIs
Publication statusPublished - 2013 Jan 1
Event3rd International Conference on Asian Nuclear Prospects, ANUP 2012 - Beijing, China
Duration: 2012 Oct 162012 Oct 19

Keywords

  • AWP
  • Cesium
  • Chromatographic separation
  • Distribution coefficient
  • High-level liquid wastes
  • Xerogel

ASJC Scopus subject areas

  • Energy(all)

Fingerprint Dive into the research topics of 'Chromatographic separation of Cs in simulated high-level liquid wastes'. Together they form a unique fingerprint.

Cite this