The ion exchange of strontium on sodium titanate Na4Ti9O20.xH2O Academic Article uri icon

abstract

  • The ion exchange behaviour of the exchanger Na4Ti9O20.xH2O was studied with particular emphasis on Sr2+ exchange. Titration of H4Ti9O20.xH2O with 0.1M [Sr/OH/2+SrCl2] solution yielded a strontium ion exchange capacity of 5.30 meq g-1 corresponding well with the theoretical value. When strontium was absorbed on Na4Ti9O20.xH2O from neutral solutions, Sr2Ti9O20.xH2O was formed. This compound decomposed to SrTiO3 and TiO2 when heated to 870 C. From alkaline solutions strontium was absorbed both as Sr/OH/+ and Sr2+ with the proportion of the former species increasing with pH. At pH 12.8 only exchange of Sr/OH/+ was observed and the exchanged form was Na2/SrOH/2Ti9O20.xH2O. This compound decomposed to Na2Ti6O13 and an unidentified strontium titanate when heated to 870 C. Distribution coefficients were determined for alkali and alkaline earth metal ions as a function of pH. The selectivity sequence for alkaline earth metal ions was Ba>Sr{all equal to}Ca>Mg, and that for alkali metal ions was Cs>K>Li /pH 2-6/ and Li>Cs>K /pH 7/. 1987 Akadmiai Kiad.

published proceedings

  • Journal of Radioanalytical and Nuclear Chemistry Letters

altmetric score

  • 3

author list (cited authors)

  • Lehto, J., & Clearfield, A.

citation count

  • 67

complete list of authors

  • Lehto, J||Clearfield, A

publication date

  • June 1987