Synopsis
This paper reviews some published and unpublished data on the ion- exchange properties of AMP. The three NH4 + ions are only partially exchanged for large monovalent ions. In the case of NH4 +/K+ exchange, the energy lost by the breaking of H bonds between the NH4 + ions and anionic cage oxygen atoms beyond the point of maximum exchange is no longer compensated for by bond strengthening in the anion due to contraction of the cage. With Rb+, Cs+ and Tl+, limited convertibility results from the lattice expansion required to accommodate these larger ions. During exchange, part of the cations pass through the anionic cages, thereby causing considerable lattice disorder. The maximum exchange capacity of AMP for the alkali metal ions is not a simple function of cation radius.
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© 1987 Elsevier Applied Science Publishers Ltd
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Boeyens, J.C.A., McDougall, G.J., van R. Smit, J. (1987). The Mechanism of Ion Exchange on Ammonium 12-Molybdophosphate (AMP). In: Williams, P.A., Hudson, M.J. (eds) Recent Developments in Ion Exchange. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3449-8_28
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DOI: https://doi.org/10.1007/978-94-009-3449-8_28
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-8044-6
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