Zhao Yuhao, Xia Kai, Zhang Zhenzong, Zhu Ziming, Guo Yongfu, Qu Zan
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215011, China.
Jiangsu Provincial Key Laboratory of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215011, China.
Nanomaterials (Basel). 2019 Mar 19;9(3):455. doi: 10.3390/nano9030455.
In order to avoid using toxic or harmful operational conditions, shorten synthesis time, enhance adsorption capacity, and reduce operational cost, a novel magnetic nano-adsorbent of CoFe₂O₄@SiO₂ with core⁻shell structure was successfully functionalized with polypyrrole (Ppy). The physical and chemical properties of CoFe₂O₄@SiO₂-Ppy are examined by various means. The as-prepared CoFe₂O₄@SiO₂-Ppy nanomaterial was used to adsorb Hg from water. During the process, some key effect factors were studied. The adsorption process of Hg onto CoFe₂O₄@SiO₂-Ppy was consistent with the pseudo-second-order kinetic and Langmuir models. The Langmuir capacity reached 680.2 mg/g, exceeding those of many adsorbents. The as-prepared material had excellent regeneration ability, dispersibility, and stability. The fitting of kinetics, isotherms, and thermodynamics indicated the removal was endothermic and spontaneous, and involved some chemical reactions. The application evaluation of electroplating wastewater also shows that CoFe₂O₄@SiO₂-Ppy is an excellent adsorbent for Hg ions from water.
为避免使用有毒或有害的操作条件、缩短合成时间、提高吸附容量并降低运营成本，一种具有核壳结构的新型磁性纳米吸附剂CoFe₂O₄@SiO₂成功地用聚吡咯（Ppy）进行了功能化改性。通过多种手段对CoFe₂O₄@SiO₂-Ppy的物理和化学性质进行了研究。将制备好的CoFe₂O₄@SiO₂-Ppy纳米材料用于吸附水中的汞。在此过程中，研究了一些关键影响因素。汞在CoFe₂O₄@SiO₂-Ppy上的吸附过程符合准二级动力学模型和朗缪尔模型。朗缪尔容量达到680.2 mg/g，超过了许多吸附剂。所制备的材料具有优异的再生能力、分散性和稳定性。动力学、等温线和热力学拟合表明，汞的去除是吸热且自发的，并且涉及一些化学反应。电镀废水的应用评估也表明，CoFe₂O₄@SiO₂-Ppy是一种从水中去除汞离子的优异吸附剂。
