Ion-exchange selectivity for alkali metal ions on a cryptomelane-type hydrous manganese dioxide

Masamichi Tsuji, Mitsuo Abe, Sridhar Komarneni

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Abstract

A cryptomelane-type hydrous manganese dioxide in the H+ form has been studied for its ion-exchange selectivity for Li+, Na+, K+, Rb+ and Cs+/H+exchange at 30.CThe distribution coefficients for each alkali cation were calculated as a function of the initial concentration of exchanging cations in the presence of a constant total normality of 0.1 N. The separation factor for the Na+ - K+ pair attained 1.3 x 1013at xm—0. This extremely high selectivity can be attributed to the rigid tunnel structure with an opening which is only accessible to less hydrated cations, those that shed their hydration shell easily and those with crystal ionic radius of approximately 1.4Á.

Original languageEnglish (US)
Pages (from-to)143-158
Number of pages16
JournalSolvent Extraction and Ion Exchange
Volume11
Issue number1
DOIs
StatePublished - Jan 1 1993

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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