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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).

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

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