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

Zhong Liu, Yongquan Zhou, Min Guo, Baoliang Lv, Zhijian Wu, Wuzong Zhou

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21 Citations (Scopus)
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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.
Original languageEnglish
Pages (from-to)712-720
JournalJournal of Hazardous Materials
Volume371
Early online date6 Mar 2019
DOIs
Publication statusPublished - 5 Jun 2019

Keywords

  • Carboxyl Fe3O4
  • Magnetic adsorbent
  • Crown ethers
  • Cesium
  • Adsorption

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