Study of sorption processes of strontium on the synthetic hydroxyapatite
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The sorption of strontium on synthetic hydroxyapatite was investigated using batch method and radiotracer technique. The hydroxyapatite samples were prepared by a wet precipitation process followed by calcination of calcium phosphate that precipitated from aqueous solution. Also, commercial hydroxyapatites were used. The sorption of strontium on hydroxyapatite depended on the method of preparation and it was pH independent ranging from 4 to 9 as a result of buffering properties of hydroxyapatite. The distribution coefficient K d was significantly decreased with increasing concentration of Sr2+ and Ca2+ ions in solution with concentration above 1 × 10−3 mol dm−3. The percentage strontium sorption for commercial and by wet method prepared hydroxyapatite was in the range of 83–96%, while calcined hydroxyapatite was ranging from 10 to 30%. The experimental data for sorption of strontium have been interpreted in the term of Langmuir isotherm. The sorption of Sr2+ ions was performed by ion-exchange with Ca2+ cations on the crystal surface of hydroxyapatite. Although calcined hydroxyapatite is successfully used as biomaterial for hard tissues repair, it is not used for the treatment of liquid wastes.
KeywordsSorption Hydroxyapatite Strontium Langmuir isotherm
- 19.Krejzler J, Narbutt J (2003) Adsorption of strontium, europium and americium(III) ions on novel adsorbent Apatite II. Nukleonika 48(4):171–175Google Scholar
- 20.Raičević S, Vuković Ž, Lizunova TL, Komarov VF (1996) The uptake of strontium by calcium phosphate phase formed at an elevated pH. J Radioanal Nucl Chem 204(2):363–370Google Scholar
- 25.Krištín J, Gábor T (1984) Keramická hmota na báze hydroxilapatitu a oxihydroxilapatitu pre implantáty s prirodzenou fixáciou. Patent CS8300114 (A1)Google Scholar