Fluorinated Hypercrosslinked Polymers with Exceptional Capacity for Perfluorooctanoic Acid Removal from Water.

Area of Science:

• Environmental Chemistry
• Materials Science
• Polymer Chemistry

Background:

• Perfluorooctanoic acid (PFOA) is a persistent pollutant with significant environmental and health concerns.
• Effective removal of PFOA from water requires advanced adsorbent materials with high efficiency and capacity.

Purpose of the Study:

• To synthesize and characterize novel fluorinated hypercrosslinked polymers (FHCPs) for PFOA adsorption.
• To evaluate the adsorption capacity, kinetics, and reusability of FHCPs for PFOA removal from aqueous samples.

Main Methods:

• Synthesis and characterization of FHCPs.
• Batch adsorption experiments using tap and lake water.
• Adsorption-desorption cycling for reusability assessment.
• Density functional theory (DFT) calculations to elucidate adsorption mechanisms.

Main Results:

• FHCP-3 exhibited an exceptional PFOA adsorption capacity of 1550 ± 60 mg g^-1.
• Equilibrium was reached within 60 min, even at low PFOA concentrations (1 mg L^-1).
• FHCP-3 maintained high removal efficiency over six adsorption-desorption cycles, demonstrating excellent reusability.

Conclusions:

• FHCP-3 is a highly effective adsorbent for PFOA removal, outperforming existing materials in capacity, kinetics, and durability.
• The study highlights FHCP-3 as a promising, low-cost material for water purification and environmental remediation of PFOA.
• Strong non-covalent interactions govern the selective adsorption of PFOA onto FHCP-3, as confirmed by DFT calculations.