College of Marine Environment and Engineering, Shanghai Maritime University, 1550 Hai Gang Da Dao, Nanhui District, Shanghai 200135, PR China.
J Hazard Mater. 2010 May 15;177(1-3):126-30. doi: 10.1016/j.jhazmat.2009.12.005. Epub 2009 Dec 5.
Carbonate hydroxyapatite (CHAP) synthesized from eggshell waste was used for removing lead ion from aqueous solutions. The effects of pH, contact time and initial concentration were studied in batch experiments. The maximum uptake of lead ion was obtained at pH 6.0. Adsorption equilibrium was established by 60 min. The pseudo-first order, pseudo-second order and intraparticle diffusion kinetic models were applied to study the kinetics of the sorption processes. The pseudo-second order kinetic model provided the best correlation (R(2)>0.9991) of the used experimental data compared to the pseudo-first order and intraparticle diffusion kinetic models. The adsorption of lead ion by CHAP increased as the initial concentration of lead ion increased in the medium. The maximum lead ion adsorbed was found to be 101 mg g(-1). It was found that the adsorption of Pb(II) on CHAP was correlated well (R(2)=0.9995) with the Langmuir equation as compared to Freundlich isotherm equation under the concentration range studied. This study indicated that CHAP could be used as an efficient adsorbent for removal of lead ion from aqueous solution.
蛋壳废弃物合成的碳酸羟基磷灰石（CHAP）用于从水溶液中去除铅离子。在批处理实验中研究了 pH 值、接触时间和初始浓度的影响。在 pH 值为 6.0 时，铅离子的最大吸收量达到最大。吸附平衡在 60 分钟内建立。应用伪一级、伪二级和内扩散动力学模型来研究吸附过程的动力学。与伪一级和内扩散动力学模型相比，拟二级动力学模型为所使用的实验数据提供了更好的相关性（R(2)>0.9991）。在介质中，铅离子初始浓度的增加会导致 CHAP 对铅离子的吸附增加。发现最大吸附的铅离子为 101 mg g(-1)。与 Freundlich 等温方程相比，在研究的浓度范围内，发现 Pb(II)在 CHAP 上的吸附与 Langmuir 方程有很好的相关性（R(2)=0.9995）。这项研究表明，CHAP 可以用作从水溶液中去除铅离子的有效吸附剂。
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