Selective uptake of cesium by ammonium tungstophosphate (AWP) - Calcium alginate composites

Hitoshi Mimura, Mikio Saito, Kenichi Akiba, Yoshio Onodera

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18 Citations (Scopus)


The fine crystals of ammonium tungstophosphate (AWP) exchanger were immobilized in the biopolymer consisting of calcium alginate (CaALG) gels. The uptake rate of Cs+ for the AWP-CaALG composite was fairly fast and the uptake percentage of Cs+ was above 90% within 30 min even in the presence of 5 M HNO3. In a wide HNO3 concentration region of 0.1 - 5 M, the distribution coefficient of Cs- for the composite was about 104 cm3/g, while those for other nuclides, Na+, Sr2-, Co2+, Eu3+ and Am3+, were less than 10 cm3/g. The uptake of Cs+ followed a Langmuir-type adsorption equation, and the maximum uptake capacity of Cs+ increase with the content of AWP immobilized in the composite. The trace amounts of 137Cs in the presence of 5 M NaNO3-1 M HNO3 were selectivity adsorbed on the composite column. The AWP-CaALG composite proved to be effective for the selective removal of radioactive cesium from waste solutions containing HNO3 and NaNO3.

Original languageEnglish
Pages (from-to)1015-1027
Number of pages13
JournalSolvent Extraction and Ion Exchange
Issue number5
Publication statusPublished - 2000 Jan 1

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)


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