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 Akadémiai Kiadö.

altmetric score

  • 3

author list (cited authors)

  • Lehto, J., & Clearfield, A.

citation count

  • 57

publication date

  • June 1987