Adsorption of Eu3+ to smectites and fluoro-tetrasilicic mica
Okada, Tomohiko (Shinshu University. Department of Chemistry and Material Engineering)
Ehara, Yusuke (Waseda University. Graduate School of Science and Engineering)
Ogawa, Makoto (Waseda University. Graduate School of Science and Engineering)

Data:	2007
Resum:	The adsorption of Eu 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 Eu for Na-TSM. The high affinity of TSM for Eu was thought to be related to the large electronegativity of the octahedral fluorine groups in TSM. Photoluminescence of adsorbed Eu was observed for saponite and TSM, but not for montmorillonite. Quenching of Eu luminescence by Fe in the montmorillonite structure is the probable reason for this phenomenon. The luminescence intensity varied with the amount of adsorbed Eu for saponite and TSM as a result of self-quenching.
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Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Adsorption ; Europium (III) Ion ; Fluoro-tetrasilicic Mica ; Kunipia F ; Montmorillonite ; Photoluminescence ; Sumecton SA ; Synthetic Saponite
Publicat a:	Clays and Clay Minerals, Vol. 55, Núm. 4 (2007) , p. 348-353, ISSN 1552-8367

DOI: 10.1346/CCMN.2007.0550402

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