Na-4-mica: Cd2+, Ni2+, Co2+, Mn2+ and Zn2+ ion exchange

Tatsuya Kodama, Sridhar Komarneni

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Selective cation exchange for divalent transition metals of Cd, Ni, Co, Mn and Zn has been investigated with the high-charge-density sodium fluorophlogopite mica, Na-4-mica. The Na-4-mica was easily and economically prepared by the crystallization from a mixture of NaF, MgO and metakaolin, the latter serves as an inexpensive aluminosilicate source. Ion exchange isotherms for Cd2+, Ni2+, Co2+, Mn2+ and Zn2+ were obtained at room temperature and the thermodynamic functions of the ion exchange equilibria were calculated. The 2Na+ → M2+ exchange with the Na-4-mica showed the following selectivity: Zn2+ > Ni2+ ≃Co2+ ≃Cd2+ > Mn2+. The interlayer structure of the hydrated Na-4-mica with the open interlayer space in the range 12.1-13.9 Å was retained during the ion-exchange reaction, indicating the possibility of the reversible 2Na+ ⇆M2+ exchange. The basic selective cation exchange studies of the high-charge-density ion exchanger are of relevance in recovery of metals from waste solution, and waste water treatment and disposal.

Original languageEnglish (US)
Pages (from-to)533-539
Number of pages7
JournalJournal of Materials Chemistry
Issue number2
StatePublished - Jan 1 1999

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Materials Chemistry


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