Hydroxyapatite (HAP) nanostructures with different morphologies have been successfully synthesized in a facile method and the pH value of the solution has an important effect on morphology. Among them, the porous HAP nanospheres (NSs) with an average diameter of 76 nm were further employed as adsorbent to remove the heavy metal ions in solution. The BET surface area, pore size and pore volume of porous HAP NSs were 45.3 m²·g⁻¹, 2.7 nm and 0.23 m³·g⁻¹, respectively. The ICP results showed that the porous HAP NSs could remove effectively Pb²⁺, Cd²⁺, Cu²⁺, Co²⁺, Ni²⁺, Zn²⁺, Hg²⁺ ions and the maximum adsorption capacity reached 254.90 mg·g⁻¹. Experimental equilibrium data were also analyzed by the Langmuir and Freundlich models and the best fit was obtained with the Langmuir isotherm equation. The kinetic study indicated that the adsorption of Pb²⁺ ions on porous HAP NSs was almost instantaneous and the maximum adsorption was reached within 20 min. Compared with the pseudo 1st order model, the adsorption kinetic data was well described by the pseudo 2rd kinetic model. In addition, the porous HAP NSs had a good stability and would be a promising nanoadsorbent for heavy metal ions.

已经以一种简便的方法成功地合成了具有不同形态的羟基磷灰石（HAP）纳米结构，溶液的pH值对形态具有重要影响。其中，平均直径为76 nm的多孔HAP纳米球（NSs）被进一步用作吸附剂，以去除溶液中的重金属离子。多孔HAP NSs的BET表面积，孔径和孔体积分别为45.3m ² ·g ^-1，2.7nm和0.23m ³ ·g ^-1。ICP分析表明，多孔HAP NSs可以有效去除Pb 2 ⁺，Cd 2 ⁺，Cu 2 ⁺，Co 2 ⁺，Ni 2 ⁺，Zn 2 ⁺，Hg²⁺离子，最大吸附容量为254.90 mg·g ^-1。还通过Langmuir和Freundlich模型分析了实验平衡数据，并使用Langmuir等温线方程获得了最佳拟合。动力学研究表明，Pb ²⁺离子在多孔HAP NSs上的吸附几乎是瞬时的，在20分钟内达到最大吸附。与伪一阶模型相比，吸附动力学数据可以通过伪二阶动力学模型很好地描述。此外，多孔HAP NSs具有良好的稳定性，将成为重金属离子的有前途的纳米吸附剂。