Advancing PFAS Sorbent Design: Mechanisms, Challenges, and Perspectives.

Area of Science:

• Environmental Chemistry
• Materials Science
• Chemical Engineering

Background:

• Per- and polyfluoroalkyl substances (PFAS) are persistent synthetic chemicals with widespread environmental contamination and toxicity concerns.
• Global regulations have increased significantly since 2002 due to PFAS accumulation and health risks.
• Sorption offers an efficient strategy for capturing PFAS from contaminated sources.

Purpose of the Study:

• To critically review current design criteria for per- and polyfluoroalkyl substances (PFAS) sorbents.
• To focus on the sorption and interaction mechanisms employed by these sorbents.
• To identify limitations of existing PFAS sorbent technologies and provide future outlooks.

Main Methods:

• Review of existing literature on PFAS sorbent design and performance.
• Analysis of intermolecular interactions (hydrophobic, electrostatic, fluorous) utilized in PFAS capture.
• Evaluation of the effectiveness and limitations of commercially available PFAS sorbents.

Main Results:

• Commercially available PFAS sorbents primarily utilize hydrophobic and electrostatic interactions.
• Fluorous interactions represent a novel mechanism for enhancing sorbent selectivity towards PFAS.
• Current sorbent designs face limitations in terms of efficiency, selectivity, and regeneration.

Conclusions:

• Understanding sorption and interaction mechanisms is crucial for designing effective PFAS sorbents.
• Innovative designs incorporating fluorous interactions and advanced materials are needed for improved PFAS removal.
• Further research is essential to overcome current limitations and develop sustainable solutions for PFAS remediation.