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Adsorption of Eu3+ to smectites and fluoro-tetrasilicic mica

Published online by Cambridge University Press:  01 January 2024

Tomohiko Okada ,
Yusuke Ehara  and
Makoto Ogawa
Tomohiko Okada*
Affiliation:
Department of Earth Sciences, Waseda University, Nishiwaseda 1-6-1, Shinjuku-ku, Tokyo 169-8050, Japan
Yusuke Ehara
Affiliation:
Graduate School of Science and Engineering, Waseda University, Nishiwaseda 1-6-1, Shinjuku-ku, Tokyo 169-8050, Japan
Makoto Ogawa*
Affiliation:
Department of Earth Sciences, Waseda University, Nishiwaseda 1-6-1, Shinjuku-ku, Tokyo 169-8050, Japan Graduate School of Science and Engineering, Waseda University, Nishiwaseda 1-6-1, Shinjuku-ku, Tokyo 169-8050, Japan
*
†Present address: Department of Chemistry and Material Engineering, Faculty of Engineering, Shinshu University, Wakasato 4-17-1, Nagano 380-8553, Japan
*E-mail address of corresponding author: makoto@waseda.jp
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Abstract

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The adsorption of Eu3+ from aqueous solution to natural Na+-montmorillonite (Kunipia F), synthetic saponite (Sumecton SA) and synthetic fluoro-tetrasilicic mica (Na+-TSM) clay samples was investigated. Adsorption capacities derived from the isotherms were 1.02, 0.71 and 1.00 meq/g of clay, respectively, for Kunipia F, Sumecton SA and Na+-TSM. The adsorption capacities were comparable to the cation exchange capacities of the clays, which were 1.19, 0.71 and 0.94 meq/g of clay, respectively. The greater slope of the TSM adsorption isotherm relative to the montmorillonite and saponite isotherms indicates a high affinity of Eu3+ for Na+-TSM. The high affinity of TSM for Eu3+ was thought to be related to the large electronegativity of the octahedral fluorine groups in TSM. Photoluminescence of adsorbed Eu3+ was observed for saponite and TSM, but not for montmorillonite. Quenching of Eu3+ luminescence by Fe in the montmorillonite structure is the probable reason for this phenomenon. The luminescence intensity varied with the amount of adsorbed Eu3+ for saponite and TSM as a result of self-quenching.

Keywords

AdsorptionEuropium (III) IonFluoro-tetrasilicic MicaKunipia FMontmorillonitePhotoluminescenceSumecton SASynthetic Saponite
Type
Research Article
Information
Clays and Clay Minerals , Volume 55 , Issue 4 , August 2007 , pp. 348 - 353
Copyright
Copyright © 2007, The Clay Minerals Society

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