Zeolites are expected to be used in buffer materials as an admixture to bentonite to increase their ion exchange ability. The behavior of ion exchange adsorption of Am3+ on various zeolites was examined by batch and column methods. The distribution coefficient of Am3+, Kd, increased with equilibrium pH from 1.5 to 4.0. L zeolite and mordenite having large pore size yielded relatively large values of Kd over 103 at pH 3.0. The Kd for L zeolite was unaffected by the concentration of coexisting cations, i.e. Na+ up to 0.1 M, and K+, Ca2+ and Mg2+ less than 0.01 m. The Am3+ ion was not detected in the effluent passed through the L zeolite column up to 90 bed volumes, even when the feed solution contained a relatively large amount of Na+-0.5 m. Americium ion adsorbed on zeolites could be quantitatively eluted with 0.1 m nitric acid.
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Nuclear Energy and Engineering