Abstract
The adsorption of Zn2+ on synthetic hydroxyapatite was investigated using a batch method and a radiotracer technique. The commercial hydroxyapatite and hydroxyapatite of high crystallinity with Ca/P ratio of 1.563:1.688 prepared by a wet precipitation process were used in this study. The adsorption of zinc on hydroxyapatite was pH independent ranging from 4.5 to 6.5 as a result of buffering properties of hydroxyapatite. The adsorption of zinc was rapid and the percentage of Zn adsorption on both samples of hydroxyapatite was >96% during the first 30 min of the contact time. The experimental data for adsorption of zinc have been interpreted in terms of Langmuir isotherm and the values of maximum adsorption capacity of zinc on a commercial hydroxyapatite and hydroxyapatite prepared by wet precipitation process were calculated to be 0.437 and 0.605 mmol g−1, respectively. The competition effect of Fe2+ towards Zn2+ adsorption was stronger than that of Ca2+, Mg2+, and Sr2+ ions. The ability of the bivalent cations to depress the adsorption of zinc on hydroxyapatite was in the following order: Fe2+ > Ca2+ > Sr2+ ≈ Mg2+.
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