Ultrafine Na-4-mica: Uptake of alkali and alkaline earth metal cations by ion exchange

Tatsuya Kodama, Masahito Ueda, Yumiko Nakamuro, Ken Ichi Shimizu, Sridhar Komarneni

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The cation exchange properties of alkali and alkaline earth metal cations at room temperature were investigated on an ultrafine, highly charged Na-4-mica (with the ideal mica composition Na 4Mg 6Al 4Si 4O 20F 4·xH 2O). Ultrafine mica crystallites of 200 nm in size led to faster Sr 2+ uptake kinetics in comparison to larger mica crystallites. The alkali metal ion (K +, Cs +, and Li +) exchange uptake was rapid, and complete exchange occurred within 30 min. For the alkaline earth metal ions Ba 2+, Ca 2+, and Mg 2+, however, the exchange uptake required lengthy periods from 3 days to 4 weeks to be completed, similar to its Sr uptake, as previously reported. Kinetic models of the modified Freundlich and parabolic diffusion were examined for the experimental data on the Ba 2+, Ca 2+, and Mg 2+ uptakes. The modified Freundlich model described well the Ba 2+ ion uptake kinetics as well as that for the Sr 2+ ion, while for the Ca 2+ and Mg 2+ ions the parabolic diffusion model showed better fitting. The alkali and alkaline earth ion exchange isotherms were also determined in comparison to the Sr 2+ exchange isotherm. The thermodynamic equilibria for these cations were compared by using Kielland plots evaluated from the isotherms.

Original languageEnglish (US)
Pages (from-to)4920-4925
Number of pages6
JournalLangmuir
Volume20
Issue number12
DOIs
StatePublished - Jun 8 2004

Fingerprint

Alkaline Earth Metals
Alkaline earth metals
alkaline earth metals
Mica
Alkalies
mica
Cations
alkalies
Ion exchange
Positive ions
Isotherms
cations
isotherms
Ions
Crystallites
crystallites
Kinetics
Metal ions
metal ions
kinetics

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Kodama, Tatsuya ; Ueda, Masahito ; Nakamuro, Yumiko ; Shimizu, Ken Ichi ; Komarneni, Sridhar. / Ultrafine Na-4-mica : Uptake of alkali and alkaline earth metal cations by ion exchange. In: Langmuir. 2004 ; Vol. 20, No. 12. pp. 4920-4925.
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Ultrafine Na-4-mica : Uptake of alkali and alkaline earth metal cations by ion exchange. / Kodama, Tatsuya; Ueda, Masahito; Nakamuro, Yumiko; Shimizu, Ken Ichi; Komarneni, Sridhar.

In: Langmuir, Vol. 20, No. 12, 08.06.2004, p. 4920-4925.

Research output: Contribution to journalArticle

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