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Am3+ and Eu3+ /alkali cation exchange selectivity on mordenite and zeolite L

Published online by Cambridge University Press:  31 January 2011

Masamichi Tsuji  and
Hitoshi Mimura
Masamichi Tsuji
Affiliation:
Tokyo Institute of Technology, Research Center for Carbon Recycling and Utilization, Ookayama, Meguro-ku, Tokyo 152–8552, Japan
Hitoshi Mimura
Affiliation:
Tohoku University, Institute for Advanced Materials Processing, 2–1–1 Katahira, Aoba-ku, Sendai 980–8577, Japan
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Abstract

Am3+ and Eu3+ /alkali cation exchange selectivity was studied on mordenite and zeolite L at 25 to 60 °C to examine the effect of their openings of ion-exchange sites. The corrected selectivity coefficient at the infinitesimal exchange increased in the order of Eu3+ < Am3+ on mordenite and Am3+ < Eu3+ on zeolite L. The selectivity reversal did not reflect the effect of the ionic form, but reflected the dimension of the opening of the ion-exchange site and charge of trivalent cations, since the crystal ionic radii of alkali cations were much smaller than the openings of these zeolites (7–8 Å).

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Journal of Materials Research , Volume 15 , Issue 12 , December 2000 , pp. 2849 - 2856
Copyright
Copyright © Materials Research Society 2000

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