Exchange of alkaline earth cations with the butylamine intercalate of α-zirconium phosphate
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The ion uptake behavior of the butylamine intercalate of α-zirconium phosphate, Zr(HPO4) · H2O, towards alkaline earth cations has been examined. The rates of uptake are in the order Sr2+≈Ca2+>Ba2+≫Mg2+. Because of the high pH afforded by the amine intercalate, the exchanged phase is always the fully exchanged one, ZrM(PO4)2·nH2O. The values of n were found to be 4 for Mg2+ and Ca2+, 3 for Sr2+ and 2 for Ba2+. Uptake of ions is quantitative to about 6 meq/g loading when no excess amine is present. Sharply reduced loadings occur in the presence of excess of free amine. A solution containing equal amounts of Ca2+ and Mg2+ yields a new solid solution phase with a 12.6 Å spacing. © 1988 D. Reidel Publishing Company.
author list (cited authors)
Peng, G., & Clearfield, A.