ON THE MECHANISM OF ION EXCHANGE IN ZIRCONIUM PHOSPHATES XXXIII. AN EQUILIBRIUM STUDY OF Na+-K+-H+ EXCHANGE ON CRYSTALLINE α-ZIRCONIUM PHOSPHATE
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An equilibrium study of the Na+-K+-H+exchange on crystalline α-zirconium phosphate has been carried out. Isotherms for the ion exchange have been determined and phases formed during the exchange have been identified. For 0-50% of exchange, the exchanger greatly prefers potassium to sodium. The sodium and potassium half-exchanged phases were found to be at equilibrium when the ratio of the sodium-potassium ion concentration of the solution is 10:1. For the second half of exchange, sodium is slightly preferred to potassium. A phase diagram of the ternary system is given. From the sodium-potassium distribution on the exchanger, the amount of surface sites was found to be 0.039, 0,087, and 0.18 meq per g exchanger at alkali metal ion loadings of 1.4, 2.3, and 3.2 meq per g exchanger, respectively. The increase in surface sites with increased loading may result from fracturing of the crystals during exchange. © 1983, Taylor & Francis Group, LLC. All rights reserved.
author list (cited authors)
Kullberg;, L., & Clearfield, A.