Selective trace bromide ion removal from chloride ion-dominated solutions using defective Zr-based metal–organic frameworks

Woo Yeon Moon, Dong Gyu Park, Younghu Son, Minyoung Yoon, Kyung Min Choi

Research output: Contribution to journalArticlepeer-review

Abstract

The removal of bromide ions (Br) from water is critical, as these ions can generate bromate and brominated disinfection by-products that are toxic, carcinogenic, and corrosive. Previous research has not focused on the removal of Br from water with a heavy presence of chloride ions (Cl). To address this research gap, we proposed a defective Zr-based metal–organic framework (MOF) to selectively remove trace Br in environments with high concentrations of Cl. We demonstrated that the open acidic sites on the secondary building units in a defective Zr-based MOF-808 (MOF-808-Cl) selectively removed the trace Br in the presence of high concentration of Cl using varying degrees of electrostatic interactions induced by their own polarizability. The Br removal was performed with the mixed mechanism of ion-exchange and -adsorption, with contributions of approximately 70% and 30%, respectively. The Br was successfully removed when the concentration of Cl was 100 times higher than that of Br. Our findings demonstrate the potential of MOF-808-Cl for industrial applications requiring trace ion removal and can provide insights for future research on selective ion removal in a competitive environment.

Original languageEnglish
Article number162309
JournalApplied Surface Science
Volume688
DOIs
StatePublished - 15 Apr 2025

Keywords

  • Bromide ion removal
  • Chloride ion
  • Defect site
  • Ion-adsorption
  • Ion-exchange
  • Metal–organic framework
  • Trace pollutant

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