School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China.
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China; School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China.
J Hazard Mater. 2017 Mar 15;326:211-220. doi: 10.1016/j.jhazmat.2016.12.036. Epub 2016 Dec 21.
In this paper, tetraethylenepentamine (TEPA) modified chitosan/CoFeO particles were prepared for comparative and competitive adsorption of Cu(II) and Pb(II) in single and bi-component aqueous solutions. The characteristics results of SEM, FTIR and XRD indicated that the adsorbent was successfully fabricated. The magnetic property results manifested that the particles with saturation magnetization value of 63.83emug would have a fast magnetic response. The effects of experimental parameters including contact time, pH value, initial metal ions concentration and coexisting ions on single and bi-component adsorption were investigated. The results revealed that the adsorption kinetic was followed pseudo-second-order kinetic model, indicating that chemical adsorption was the rate-limiting step. Sorption isotherms were also determined in single and bi-component solutions with different mass ratio of Cu(II) to Pb(II) (Cu(II)/Pb(II)) and fitted using Langmuir and Freundlich isotherm models. A better fit for Cu(II) and Pb(II) adsorption were obtained with Langmuir model, with a maximum sorption capacity of 168.067 and 228.311mgg for Cu(II) and Pb(II) in single component solution, 139.860 and 160.256mgg in bi-component solution (Cu(II)/Pb(II)=1:1), respectively. The present results suggest that TEPA modified chitosan/CoFeO particles are feasible and satisfactory adsorbent for efficient removal of Cu(II) and Pb(II) ions.
本文制备了四乙烯五胺（TEPA）改性壳聚糖/CoFeO 颗粒，用于对比和竞争吸附单组分和双组分水溶液中的 Cu(II)和 Pb(II)。SEM、FTIR 和 XRD 的特征结果表明成功制备了吸附剂。磁性结果表明，具有 63.83emug 饱和磁化值的颗粒将具有快速的磁响应。考察了实验参数（包括接触时间、pH 值、初始金属离子浓度和共存离子）对单组分和双组分吸附的影响。结果表明，吸附动力学符合拟二级动力学模型，表明化学吸附是限速步骤。还在不同 Cu(II)与 Pb(II)质量比（Cu(II)/Pb(II)）的单组分和双组分溶液中确定了吸附等温线，并使用 Langmuir 和 Freundlich 等温模型进行了拟合。Langmuir 模型对 Cu(II)和 Pb(II)吸附具有更好的拟合，在单组分溶液中对 Cu(II)和 Pb(II)的最大吸附容量分别为 168.067 和 228.311mgg-1，在双组分溶液中（Cu(II)/Pb(II)=1:1）分别为 139.860 和 160.256mgg-1。这些结果表明，TEPA 改性壳聚糖/CoFeO 颗粒是一种可行且令人满意的高效去除 Cu(II)和 Pb(II)离子的吸附剂。
