Synthesis of Na-4-mica from metakaolinite and MgO: Characterization and Sr2+ uptake kinetics

Sridhar Komarneni, Rajyalakshmi Pidugu, James E. Amonette

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Abstract

Na-4-mica, a high-charge-density sodium fluorophlogopite mica of ideal chemical composition Na4Mg6Al4Si4O20F 4·xH2O has been prepared from a mixture of NaF, MgO and metakaolinite (the latter serving as an inexpensive aluminosilicate source). Highly crystalline Na-4-mica can be easily and economically synthesized from the above precursors in the temperature range 850-890°C. 27Al and 29Si MAS NMR spectroscopy revealed that the Na-4-mica synthesized from metakaolinite is more close to the ideal nearest neighbor distribution of Al and Si compared to that prepared from magnesium aluminosilicate gel. Selective Sr exchange kinetic studies showed that the uptake was slow because of the somewhat large particle size as determined by scanning electron microscopy as well as restricted interlayer spacing.

Original languageEnglish (US)
Pages (from-to)205-208
Number of pages4
JournalJournal of Materials Chemistry
Volume8
Issue number1
DOIs
StatePublished - Jan 1 1998

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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