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J Hazard Mater. 2019 Mar 6;371:712-720. doi: 10.1016/j.jhazmat.2019.03.022. [Epub ahead of print]

Experimental and theoretical investigations of Cs+ adsorption on crown ethers modified magnetic adsorbent.

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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. Electronic address:
EaStCHEM, School of Chemistry, University of St Andrews, St Andrews, Fife KY16 9ST, UK. Electronic address:


Carboxyl Fe3O4 nanoparticles (Fe3O4@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 (NH4+, 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.


Adsorption; Carboxyl Fe(3)O(4); Cesium; Crown ethers; Magnetic adsorbent

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