Sun Yue, Li Xiao, Zheng Weisheng
Department of Municipal Engineering, School of Civil Engineering, Southeast University, Nanjing 210096, China.
Department of Municipal Engineering, School of Civil Engineering, Southeast University, Nanjing 210096, China.
J Hazard Mater. 2021 Feb 5;403:124012. doi: 10.1016/j.jhazmat.2020.124012. Epub 2020 Sep 18.
Adsorption using nanomaterials is considered an effective method for controlling the levels of toxic heavy metal in wastewater. Herein, a novel adsorbent, core-shell phase-transited lysozyme film-coated magnetic nanoparticles (FeO@SiO@PTL) for Hg(II) ions removal from aqueous solutions was explored via facile and fast phase transformation and self-assembly process of lysozyme. The physiochemical properties of FeO@SiO@PTL were investigated using various characterization techniques. The adsorption performances such as kinetics, isotherms, selectivity, the effect of coexisting ions, and regeneration were evaluated. FeO@SiO@PTL showed an extremely high Hg(II) uptake rate and achieved more than 90% equilibrium adsorption capacity in 5 min. Hg(II) adsorption was followed by a pseudo-second-order kinetic model and fitted the Langmuir model by achieving a maximum uptake of 701.51 mg/g. Furthermore, excellent Hg(II) selectivity was obtained in a mixed solution containing various heavy metal ions, along with good chemical stability owing to the high adsorption capacity maintained after five cycles. The adsorption analyses indicated that the amino, imino, amide, hydroxyl, carboxyl, and thiol groups exposed on the surface of FeO@SiO@PTL were vital for Hg(II) removal. Consequently, this work will significantly assist in the development of an easily available, eco-friendly, and selective adsorbent material to remove heavy metal ions from wastewater.
使用纳米材料进行吸附被认为是控制废水中有毒重金属含量的有效方法。在此，通过溶菌酶简便快速的相变和自组装过程，探索了一种新型吸附剂——核壳相变溶菌酶膜包覆磁性纳米颗粒（FeO@SiO@PTL），用于从水溶液中去除汞离子（Hg(II)）。使用各种表征技术研究了FeO@SiO@PTL的物理化学性质。评估了吸附性能，如动力学、等温线、选择性、共存离子的影响和再生性能。FeO@SiO@PTL显示出极高的Hg(II)吸附速率，在5分钟内达到了90%以上的平衡吸附容量。Hg(II)的吸附遵循准二级动力学模型，并符合Langmuir模型，最大吸附量达到701.51 mg/g。此外，在含有各种重金属离子的混合溶液中获得了优异的Hg(II)选择性，并且由于在五个循环后仍保持高吸附容量，具有良好的化学稳定性。吸附分析表明，FeO@SiO@PTL表面暴露的氨基、亚氨基、酰胺基、羟基、羧基和巯基对于去除Hg(II)至关重要。因此，这项工作将极大地有助于开发一种易于获得、环保且具有选择性的吸附材料，用于从废水中去除重金属离子。
