Separation Science and Technology · 1998 · 12 citations · 13 references
Natural SciencesBiochemistryChemistryCeramic MaterialsInorganic ChemistryMineralogyBone MineralizationCalcium Phosphate MaterialsCementitious MaterialsIon ExchangeMineral BiochemistryHydroxyapatiteIon Exchange MaterialsIon Exchange ReactionsIon-exchange CapacityStrontium Salts
ABSTRACT ABSTRACT The ion exchange of strontium hydroxyapatite (SrHAp) with Pb2+ has been investigated under acidic conditions at 293 K. The addition of various acids to the exchanging solution enhanced the exchange capacity in the order HC1 > HBr > HF > HNO3 > no acid, corresponding to the formation of halogen apatites with the former three acids or hydrogen phosphate with HNO3. Since the ion-exchange capacity of SrHAp under nonacidic conditions is higher than that of chlorapatite, the aforementioned observations can be attributed to the participation of the protons introduced by the acids.
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