On the mechanism of ion exchange in zirconium phosphatesXIX exchange of alkaline earth cations using acetate salts Academic Article uri icon

abstract

  • Zirconium phosphate was found to exchange alkaline earth cations in macro quantities from acetate solutions. Rates of exchange decrease with increasing crystallinity of the exchanger but increase appreciably with temperature. Magnesium ion exchange is very slow even at 100C. Both Mg2+ and Ba2+ each form a single exchanged phase. Their respective compositions are close to ZrMg0.75-1.0H0.5-0(PO4)24H2O and ZrBa0.8-1.0H0.4-0 (PO4)22H2O. In contrast Ca2+ and Sr2+ each form phases with cation contents close to half-exchange, i.e. ZrCa0.5-0.65H1-0.7(PO4)23H2O and ZrSr0.45-0.55H1.1-0.9(PO4)23.5H2O. these phases are then converted to ZrCa0.85-1H0.3-0(PO4)24H2O and ZrSr0.65-1H0.7-0(PO4)22.5H2O, respectively at higher loadings. Apparently acetate ion is a sufficiently strong base to initiate exchange and then maintain pH values high enough to achieve high metal loadings. 1978.

published proceedings

  • Journal of Inorganic and Nuclear Chemistry

author list (cited authors)

  • Clearfield, A., & Hagiwara, H.

citation count

  • 26

complete list of authors

  • Clearfield, Abraham||Hagiwara, Hiroyuki

publication date

  • January 1978