School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China.
School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China.
Int J Biol Macromol. 2017 Dec;105(Pt 3):1611-1621. doi: 10.1016/j.ijbiomac.2017.03.010. Epub 2017 Mar 7.
In this study, a novel, effective and environment-friendly methods was used to prepare poly-l-lysine (PLL)-functionalized magnetic FeO-(GO-MWCNTs) hybrid composite with large surface area and abundant hydroxyl and amino groups. The as-prepared PLL-FeO-(GO-MWCNTs) nanocomposite was systematically characterized by FT-IR, XRD, TGA, SEM, TEM, VSM and EDX. The PLL-FeO-(GO-MWCNTs) hybrid composite exhibited excellent adsorption performance for the removal of a dye (tartrazine) and a heave metal (Pb(II)). The result showed that adsorption of Pb(II) reached equilibrium in 30min and adsorption of tartrazine reached equilibrium in approximately 60min. Most importantly, PLL-FeO-(GO-MWCNTs) hybrid possesses high adsorption capacity, rapid separation, and less time-consuming. The equilibrium adsorption capacity was 1038.42mgg for Pb(II) and 775.19mgg for tartrazine under the optimal conditions. These two pollutants removal were found to obey Langmuir adsorption model, while the kinetics of adsorption followed pseudo-second-order kinetic model. A possible adsorption mechanism has been proposed where the chelation between PLL and Pb(II) or electrostatic interaction between GO and tartrazine. These results demonstrated the potential applications of PLL-FeO-(GO-MWCNTs) hybrid composite in deep-purification of polluted water.
在这项研究中，使用了一种新颖、有效且环保的方法来制备具有大表面积和丰富的羟基和氨基的聚-l-赖氨酸 (PLL)-功能化磁性 FeO-(GO-MWCNTs) 杂化复合材料。通过 FT-IR、XRD、TGA、SEM、TEM、VSM 和 EDX 对制备的 PLL-FeO-(GO-MWCNTs)纳米复合材料进行了系统表征。PLL-FeO-(GO-MWCNTs)杂化复合材料对去除染料（柠檬黄）和重金属（Pb(II)）表现出优异的吸附性能。结果表明，Pb(II)的吸附在 30min 内达到平衡，而柠檬黄的吸附在大约 60min 内达到平衡。最重要的是，PLL-FeO-(GO-MWCNTs)杂化具有高吸附容量、快速分离和耗时少的特点。在最佳条件下，PLL-FeO-(GO-MWCNTs)杂化对 Pb(II)的平衡吸附容量为 1038.42mgg，对柠檬黄的平衡吸附容量为 775.19mgg。这两种污染物的去除都符合 Langmuir 吸附模型，而吸附的动力学遵循拟二级动力学模型。提出了一种可能的吸附机制，即 PLL 与 Pb(II)之间的螯合作用或 GO 与柠檬黄之间的静电相互作用。这些结果表明 PLL-FeO-(GO-MWCNTs)杂化复合材料在受污染水的深度净化方面具有潜在的应用前景。
