Synthetic carbonate apatites as inorganic cation exchangers. Exchange characteristics for toxic ions
- 1 January 1990
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions
- Vol. 86 (12) , 2303-2306
- https://doi.org/10.1039/ft9908602303
Abstract
The ion-exchange characteristics between Ca2+ ions in carbonate apatites containing 6 and 16 wt % CO2– 3 ions and toxic ions (Zn2+, Cd2+, Hg2+, and Pb2+) in aqueous solution have been investigated in detail at 25 °C. From the results, it was found that the ion-exchange removal characteristics for Zn2+, Cd2+ and Pb2+ ions were enhanced with increasing CO2– 3 ion content; however, those for Hg2+ ions were similar for different CO2– 3 content. The reaction with Pb2+ ions was especially remarkable and formed Pb2+ ion-exchanged carbonate apatites. The effect of substitution of CO2– 3 for PO3– 4 ions was concluded to be a loosening effect on the skeletal structure of the apatite.Keywords
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