Abstract
The influence of Sr 2+ on fluoride uptake from monofluorophosphate (MFP) solutions by hydroxyapatite (HAp) has been investigated using adsorption measurements and X-ray photoelectron spectroscopy (XPS). XPS analysis of Sr 2+/MFP treated HAp powders indicates that a stoichiometric Sr 2+/Ca 2+ cation exchange occurs on the HAp surface. Complete exchange of surface Ca 2+ occurs at Sr 2+ concentrations >0.02 mol dm −3 forming a Sr HAp layer. Fluoride adsorption measurements reveal an increase in fluoride uptake with increasing Sr 2+ concentration in the treatment solution. XPS data also show that fluorapatite (FAp) formation increases with increasing Sr 2+ concentration and that a linear correlation exists between FAp formation and surface Sr 2+. The data further suggest the formation of MFP-like particles or precipitates on the HAp surface.
Published Version
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