Adsorption of CO2on non-stoichiometric strontium–calcium hydroxyapatites
- 1 January 1993
- journal article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions
- Vol. 89 (20) , 3821-3825
- https://doi.org/10.1039/ft9938903821
Abstract
Colloidal particles of homogeneous solid solutions of strontium and calcium hydroxyapatites (SrCaHAP) have been synthesized in different mole fractions, Sr/(Ca + Sr) ranging from 0 to 1. The crystallite size of the SrCaHAP particles obtained was a minimum around Sr/(Ca + Sr)= 0.3, whereas the specific surface area was maximum around the same Sr/(Ca + Sr). The morphology of the SrCaHAP particles became irregular as Sr/(Ca + Sr) increased up to 0.5. The irreversible adsorption of CO2 per unit surface area was a minimum at (Ca + Sr)/P = 1.56, less than the stoichiometric value of 1.67. These results suggest that there are two kinds of irreversible adsorption site for CO2 on SrCaHAP.Keywords
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