University of Utah researchers recently developed a novel material which allows for the real-time detection, and efficient removal of, perfluorooctanoic acid (PFOA) from water. PFOA is a toxic, persistent member of the “forever chemicals” family.
The work, published in the Journal of Materials Chemistry C, introduces a new dual-functional metal-organic framework dubbed UiO-66-N(CH₃)₃⁺. The zirconium-based material is known for its excellent thermal and chemical stability and demonstrates excellent fluorescence-based detection and absorption of PFOA.
"This MOF represents a major leap forward for PFAS remediation," said Rana Dalapati, the study's lead author. "Its ability to both selectively capture and sensitively detect PFOA in real time makes it a versatile and practical solution for water treatment and environmental monitoring."
The MOF is based on the widely studied UiO-66-NH₂, a material well known for tis porosity and water treatment potential. Despite its potential, when used for PFOA removal the material demonstrated weak binding interactions. To improve this the team incorporated quaternary ammonium groups to enhance electrostatic interactions with PFOA. This enhancement in electrostatic interactions resulted in a 3.4-fold increase in adsorption capacity.
The results of the study underscore the capabilities of post-synthetic modification of MOF and open the door to novel multifunctional materials for environmental contaminant remediation.