Ultra-high nitrate-selective metal-polymer membranes based on cardo polybenzimidazole for electrodialysis

A. A. Lysova, A. D. Manin, D. V. Golubenko, I. I. Ponomarev, V. A. Altynov, N. Hilal, A. B. Yaroslavtsev

Research output: Contribution to journalArticlepeer-review

Abstract

Ion exchange membranes with high monovalent ion selectivity are essential for extracting valuable components from natural and waste waters. One of the approaches to their fabrication is the creation of nanostructured materials with ion-conducting channels. In this study, materials based on cardo polybenzimidazole (PBI–O-PhT) containing Zn2+, Cr3+ and Cu2+ ions were obtained and used for the first time for electrodialysis separation. The formation of crosslinked structure due to metal-benzimidazole coordination bonds was demonstrated. The obtained metal-polymer membranes have ionic conductivity comparable to commercial ones, reaching 0.32 mS cm−1, and high values of nitrate ion transport numbers (99.2 %). It is shown that the obtained membranes achieve incredibly high values of selectivity coefficients for anion separation. The highest and most stable values were obtained for the copper-containing membrane PBI/Cu-50, which are P(NO3/SO4) = 729, P(Cl/SO4) = 109 and P(NO3/Cl) = 6.66.

Original languageEnglish (US)
Article number123518
JournalJournal of Membrane Science
Volume716
DOIs
StatePublished - Feb 2025

Keywords

  • Anion exchange membranes
  • Desalination
  • Electrodialysis
  • Metal-polymer membranes
  • Nitrate selectivity
  • Water purification

ASJC Scopus subject areas

  • Biochemistry
  • General Materials Science
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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