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

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Liu_2019_JHM_Cs_adsorption_AAM.pdf (1.727Mb)
Date
05/06/2019
Author
Liu, Zhong
Zhou, Yongquan
Guo, Min
Lv, Baoliang
Wu, Zhijian
Zhou, Wuzong
Keywords
Carboxyl Fe3O4
Magnetic adsorbent
Crown ethers
Cesium
Adsorption
QD Chemistry
NDAS
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Abstract
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.
Citation
Liu , Z , Zhou , Y , Guo , M , Lv , B , Wu , Z & Zhou , W 2019 , ' Experimental and theoretical investigations of Cs + adsorption on crown ethers modified magnetic adsorbent ' , Journal of Hazardous Materials , vol. 371 , pp. 712-720 . https://doi.org/10.1016/j.jhazmat.2019.03.022
Publication
Journal of Hazardous Materials
Status
Peer reviewed
DOI
https://doi.org/10.1016/j.jhazmat.2019.03.022
ISSN
0304-3894
Type
Journal article
Rights
Copyright © 2019 Published by Elsevier B.V. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1016/j.jhazmat.2019.03.022
Description
This work was financially supported by the NSFC (No: U1607105 and No: 51574286). The Scientific and Technological Funding in Qinghai Province (No: 2018-GX-101, No: 2018-ZJ-722 and No: 2019-HZ-808). “Light of West China” Program and Youth Innovation Promotion Association of CAS (No: 2015141 and 2016377).
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/19607

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