School of Chemistry & Materials Science, Ludong University, Shandong 264025, China.
J Hazard Mater. 2009 Dec 30;172(2-3):792-801. doi: 10.1016/j.jhazmat.2009.07.066. Epub 2009 Jul 24.
The adsorption behaviors of Hg(II) on adsorbents, chitosan functionalized by generation 1.0-3.0 of amino-terminated hyperbranched polyamidoamine polymers (denoted as CTS-1.0, CTS-2.0 and CTS-3.0, respectively), were studied. The optimum pH corresponding to the maximum adsorption capacities was found to be 5.0 for the three adsorbents. The experimental equilibrium data of Hg(II) on the three adsorbents were fitted to the Freundlich and the Langmuir models, and it is found that the Langmuir isotherm was the best fitting model to describe the equilibrium adsorption. The kinetics data indicated that the adsorption process of Hg(II) ions on CTS-1.0, CTS-2.0 and CTS-3.0 were governed by the film diffusion and followed pseudo-second-order rate model. Thermodynamic analysis and FTIR analysis revealed that the adsorption behaviors of Hg(II) ions on the three adsorbents could be considered as spontaneous, endothermic and chemical sorption process, resulting in their higher adsorption capacities at higher temperature.
研究了不同代数的胺基化超支化聚酰胺聚合物（分别表示为 CTS-1.0、CTS-2.0 和 CTS-3.0）修饰壳聚糖（CTS）对汞（II）的吸附行为。结果表明，三种吸附剂的最大吸附容量对应的最佳 pH 值均为 5.0。实验平衡数据分别用 Freundlich 和 Langmuir 模型进行拟合，发现 Langmuir 等温线是描述平衡吸附的最佳拟合模型。动力学数据表明，Hg(II)离子在 CTS-1.0、CTS-2.0 和 CTS-3.0 上的吸附过程受膜扩散控制，并遵循准二级速率模型。热力学分析和 FTIR 分析表明，Hg(II)离子在三种吸附剂上的吸附行为可以被认为是自发的、吸热的和化学吸附过程，这导致它们在较高温度下具有更高的吸附容量。
