Adsorption of Eu3+ to smectites and fluoro-tetrasilicic mica

Tomohiko Okada, Yusuke Ehara, Makoto Ogawa*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)348-353
Number of pages6
JournalClays and Clay Minerals
Issue number4
Publication statusPublished - 2007 Aug


  • Adsorption
  • Europium (III) ion
  • Fluoro-tetrasilic Mica
  • Kunipia F
  • Montmorillonite
  • Photoluminescence
  • Sumecton SA
  • Synthetic saponite

ASJC Scopus subject areas

  • Soil Science
  • Earth and Planetary Sciences (miscellaneous)
  • Geochemistry and Petrology
  • Water Science and Technology


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