冠醚修饰磁性吸附剂上 Cs 吸附的实验和理论研究。
Experimental and theoretical investigations of Cs adsorption on crown ethers modified magnetic adsorbent.
机构信息
Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China; Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining 810008, China.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China.
出版信息
J Hazard Mater. 2019 Jun 5;371:712-720. doi: 10.1016/j.jhazmat.2019.03.022. Epub 2019 Mar 6.
Carboxyl FeO nanoparticles (FeO@R-COOH) modified with 18-Crown-6 ether functional groups have been prepared via an amidation reaction and used as bifunctional adsorbent for Cs. The adsorbent has a superparamagnetic property, allowing an easy recycling, and a high capacity of Cs adsorption on the crown ether. The adsorption isotherms and kinetic behaviors agree well with the Langmuir and the pseudo-second-order models. The material exhibits a high selectivity for Cs in the solution with co-existing cations (NH, Rb, K, Na and Li). A theoretical calculation according to density functional theory (DFT) is used to estimate the structure of Cs adsorption on crown ether, demonstrating an exothermic process and showing a good agreement with the experimental observations. The adsorption behavior is affected not only by the size of macrocyclic crown ethers, but also by the chelating symmetry and the binding energy. The newly developed adsorbent has a potential application for removing cesium out of wastewater and salt lakes.
羧基化 FeO 纳米粒子（FeO@R-COOH）通过酰胺化反应进行修饰，并带有 18-冠-6 醚官能团，可用作 Cs 的双功能吸附剂。该吸附剂具有超顺磁性，便于回收，并且对冠醚上的 Cs 具有高吸附容量。吸附等温线和动力学行为均符合 Langmuir 和准二级模型。该材料在存在共存阳离子（NH、Rb、K、Na 和 Li）的溶液中对 Cs 表现出高选择性。根据密度泛函理论（DFT）的理论计算用于估计 Cs 在冠醚上的吸附结构，表明这是一个放热过程，与实验观察结果吻合良好。吸附行为不仅受大环冠醚的大小影响，还受螯合对称性和结合能影响。新开发的吸附剂有望用于从废水中和盐湖中去除铯。
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