Ministry of Labor and Social Security, Inonu Bulvari No. 42, Emek, 06520, Ankara, Turkey.
Environ Sci Pollut Res Int. 2011 Aug;19(7):2766-75. doi: 10.1007/s11356-012-0776-5. Epub 2012 Feb 4.
This study has the objective to evaluate the lead(II) removal capacity of hydroxyapatite powder synthesized by microwave as an alternative method to decrease production time and cost.
Hydroxyapatite (HA) was synthesized by a microwave-assisted precipitation method using calcium nitrate and ammonium hydrogen phosphate as calcium and phosphorus sources, respectively. X-ray diffraction and Fourier transform infrared results clearly revealed that the resulting powder was HA with high purity and crystallinity. The obtained powder was used for the removal of lead(II) from aqueous solutions. The effects of pH, amount of adsorbent, initial lead(II) concentration, and contact time were studied in batch experiments.
In the adsorption experiments, maximum lead(II) retention was obtained at pH 6. Adsorption equilibrium was established after 40 min. It was found that the adsorption of lead(II) on HA was correlated well (R (2) = 0.958) with the Freundlich equation for the concentration range studied. Both ion exchange and adsorption process were thought to exist in the removal process.
This study indicates that easily and rapidly synthesized HA by microwave-assisted precipitation method could be used as an efficient adsorbent for removal of lead(II) from aqueous solutions.
本研究旨在评估通过微波合成的羟基磷灰石粉末对铅（II）的去除能力，这是一种替代方法，可以缩短生产时间和降低成本。
采用微波辅助沉淀法，以硝酸钙和磷酸氢二铵分别作为钙源和磷源合成羟基磷灰石（HA）。X 射线衍射和傅里叶变换红外结果清楚地表明，所得粉末为具有高纯度和结晶度的 HA。将所得粉末用于从水溶液中去除铅（II）。在批量实验中研究了 pH、吸附剂用量、初始铅（II）浓度和接触时间的影响。
在吸附实验中，在 pH 6 时获得了最大的铅（II）保留率。在 40 分钟后达到吸附平衡。发现铅（II）在 HA 上的吸附与 Freundlich 方程很好地相关（R²=0.958），适用于所研究的浓度范围。去除过程中存在离子交换和吸附过程。
本研究表明，通过微波辅助沉淀法容易且快速合成的 HA 可作为从水溶液中去除铅（II）的有效吸附剂。
