National Engineering Research Center of Industrial Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China; Collaborative Innovation Center of Chemical Science and Engineering(Tianjin), Tianjin 300072, China.
National Engineering Research Center of Industrial Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China.
Chemosphere. 2018 Sep;206:513-521. doi: 10.1016/j.chemosphere.2018.04.184. Epub 2018 May 10.
In this study, a novel magnetic nanoparticles (MNP) modified by an organodisulfide polymer (PTMT) was designed for adsorption of heavy metals (Hg(II), Pb(II) and Cd(II)) from simulated coal chemical high salinity wastewater. The MNP-PTMT nano-composite was synthesize and characterized by SEM, TEM, FTIR, BET, VSM, TGA and XRD. The results indicate that the wanted MNP-PTMT magnetic nanoparticles were successfully obtained by modification. Adsorption experiments were systematically carried out to evaluate the performance of the obtained nanoparticles and to build up the adsorption models. The results demonstrate that the adsorption kinetic and isotherms thermodynamic followed the pseudo-second-order model and the Freundlich equation, respectively. In the presence of the inorganic salt in high salinity wastewater, the adsorption efficiency of MNP-PTMT for heavy metals was still excellent. The magnetic adsorbent could be recovered from aqueous solution by an external magnetic field in 20s and the subsequent regeneration of Hg(II)/Pb(II) loaded MNP-PTMT can be efficiently achieved by using EDTA-2Na solution as desorbent. The novel MNP-PTMT nanoparticles could be used reproductively for five times without apparent decrease in sorption capacity.
在这项研究中，设计了一种新型的巯基有机聚合物（PTMT）修饰的磁性纳米颗粒（MNP），用于从模拟煤化工高盐废水中吸附重金属（Hg(II)、Pb(II)和 Cd(II)）。通过 SEM、TEM、FTIR、BET、VSM、TGA 和 XRD 对 MNP-PTMT 纳米复合材料进行了合成和表征。结果表明，通过修饰成功获得了所需的 MNP-PTMT 磁性纳米颗粒。进行了吸附实验，以评估所得纳米颗粒的性能并建立吸附模型。结果表明，吸附动力学和等温热力学分别遵循准二级模型和 Freundlich 方程。在高盐废水中无机盐的存在下，MNP-PTMT 对重金属的吸附效率仍然优异。磁性吸附剂可以在外加磁场中在 20s 内从水溶液中回收，并用 EDTA-2Na 溶液作为解吸剂可以有效地再生负载 Hg(II)/Pb(II)的 MNP-PTMT。新型 MNP-PTMT 纳米颗粒可以重复使用五次，而吸附容量没有明显下降。
