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 language | English |
---|---|
Article number | 162309 |
Journal | Applied Surface Science |
Volume | 688 |
DOIs | |
State | Published - 15 Apr 2025 |
Keywords
- Bromide ion removal
- Chloride ion
- Defect site
- Ion-adsorption
- Ion-exchange
- Metal–organic framework
- Trace pollutant