College of New Energy and Environment, Jilin University, Changchun, 130021, People's Republic of China; Key Lab of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130021, People's Republic of China; Jilin Provincial Key Laboratory of Water Resources and Environment, Jilin University, Changchun, 130021, People's Republic of China; Institute of Water Resources and Environment, Jilin University, Changchun, 130021, People's Republic of China.
School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, Nanjing, 210044, China.
Chemosphere. 2022 Jan;287(Pt 2):132156. doi: 10.1016/j.chemosphere.2021.132156. Epub 2021 Sep 5.
In the recent decades, due to rapid increase in industrialization, urbanization, anthropogenic activity in the catchments, removal of heavy metals contaminants in wastewater has become global challenges. Numerous advance technologies have been introduced to deal with these problems but failed in reducing adequate pollution load in the contaminated water and/or wastewater. In this study, sulfur-ferromagnetic nanoparticles (SFMNs) were synthesized by modification of nano-FeO, which can be rapidly separated from the environment by an external magnetic field after in situ repair. Its structure and physical properties were characterized by conventional techniques included Transmission electron microscope (TEM), X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). The ability of the SFMNs to remove Pb and Cd was studied at different temperatures and initial metal ions concentrations. The adsorption kinetics showed that the adsorption equilibrium time of Pb and Cd was 300 min consequently adsorption process of SFMNs fit well (R > 0.99) with pseudo-second-order model. The adsorption thermodynamics showed that the adsorption of Pb and Cd on SFMNs is spontaneous (negative value of ΔG) endothermic process (positive value of ΔH) and fit well (R > 0.98) with the Langmuir isothermal model. Density functional theory (DFT) calculations show that SFMNs can transfer electrons to Pb and Cd, and the metal ions form stable chelates on the ligand surface. This study implies that newly synthesized sulfur-ferromagnetic nanoparticles could play an instrumental role in metal ions removal from water and wastewater.
在最近几十年，由于工业化、城市化的快速发展，以及流域内人为活动的增加，去除废水中的重金属污染物已成为全球性的挑战。已经引入了许多先进的技术来处理这些问题，但未能减少受污染水中的足够的污染负荷和/或废水。在这项研究中，通过纳米-FeO 的原位修复，合成了硫-铁磁纳米粒子（SFMNs），它可以通过外部磁场从环境中快速分离出来。采用透射电子显微镜（TEM）、X 射线衍射（XRD）和振动样品磁强计（VSM）等常规技术对其结构和物理性质进行了表征。研究了 SFMNs 在不同温度和初始金属离子浓度下对 Pb 和 Cd 的去除能力。吸附动力学表明，Pb 和 Cd 的吸附平衡时间为 300 min，因此 SFMNs 的吸附过程很好地符合（R>0.99）准二级模型。吸附热力学表明，Pb 和 Cd 在 SFMNs 上的吸附是自发的（ΔG 值为负）吸热过程（ΔH 值为正），并很好地符合（R>0.98）Langmuir 等温模型。密度泛函理论（DFT）计算表明，SFMNs 可以向 Pb 和 Cd 转移电子，金属离子在配体表面形成稳定的螯合物。这项研究表明，新合成的硫-铁磁纳米粒子可以在从水中去除金属离子方面发挥重要作用。
