Recovery of cesium ions from seawater using a porous silica-based ionic liquid impregnated adsorbent

Hao Wu, Tatsuya Kudo, Sonyun Kimu, Misako Miwa, Shigeo Matsuyama

Research output: Contribution to journalArticlepeer-review

Abstract

A porous silica-based adsorbent was prepared by impregnating the pores of a silica support with the extractant 1,3-[(2,4-diethylheptylethoxy)oxy]-2,4-crown-6-calix[4]arene (Calix[4]arene-R14) and an additive agent 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (C2mim + NTf2) as the materials to remove cesium(I) (Cs+) ions from seawater. The as-prepared adsorbent showed excellent adsorption performance toward Cs+ ions, with adsorption equilibrium reached within 2 h and an adsorption amount of 0.196 mmol/g observed. The solution pH, temperature, and the presence of coexisting metal ions were found to have almost no effect on Cs+ adsorption. The adsorption mechanism was considered to proceed via ion exchange between Cs+ and C2mim+. In addition, the particle-induced X-ray emission analysis results further clarified that the adsorbed Cs+ ion species on the adsorbent was in the form of both CsCl and CsBr.

Original languageEnglish
JournalNuclear Engineering and Technology
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • Adsorption
  • Cesium
  • Particle-induced X-ray emission
  • Seawater

ASJC Scopus subject areas

  • Nuclear Energy and Engineering

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