Lanthanides adsorption on metal-organic framework: Experimental insight and spectroscopic evidence

Roxana Paz, Nishesh Kumar Gupta, Herlys Viltres, Carolina Leyva, Adolfo Romero-Galarza, Seshasai Srinivasan, Amin Reza Rajabzadeh

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Herein, lanthanides (Samarium: Sm, Lanthanum: La, and Erbium: Er) adsorption mechanism over copper trimesate metal-organic framework (Cu-BTC MOF) was studied. The MOF crystallized as [Cu(HBTC)(H2O)3] and [Cu3(BTC)2] with a rod-like structure and abundant free –COOH groups. The Langmuir adsorption capacity of 1007.1, 656.5, and 410.5 mg g−1 was recorded for Sm, La, and Er, respectively. The adsorption process was driven by rapid ion exchange with crystal structure transformation in the first hour of mixing, mediated by the surface ion-exchange phenomenon and free –COOH groups. After 1 h, the process was driven by a slow ion-exchange mechanism where Ln ions drifted internally, and Cu ions moved out towards the surface. Among the three lanthanides studied, Er/Cu-BTC system was more sensitive to structural reorganization with the increasing Ln/Cu ratio. The work reported here is one of the first detailed accounts of the Ln-adsorption process in MOFs.

Original languageEnglish
Article number121606
JournalSeparation and Purification Technology
Volume298
DOIs
StatePublished - 1 Oct 2022
Externally publishedYes

Keywords

  • Cu-BTC
  • Ion-exchange
  • Lanthanides
  • Mechanism
  • Spectroscopy

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