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Updated: Jul 9, 2026

Characterization and Application of Passive Samplers for Monitoring of Pesticides in Water

Characterization and Application of Passive Samplers for Monitoring of Pesticides in Water

Published on: August 3, 2016

Potential-Dependent SEIRAS Study of PFAS Surface Adsorption.

Katherine Betts¹, Yuhan Jiang¹, Andrew Yanagimachi¹

¹Department of Chemistry and Biochemistry, University of Nevada, Las Vegas, Nevada 89154, United States.

Analytical Chemistry

|July 18, 2025

Summary

Surface charge influences per- and polyfluoroalkyl substances (PFAS) adsorption onto surfaces. Hydrophobic interactions dominate over electrostatic forces, impacting water remediation strategies for PFAS contamination.

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Last Updated: Jul 9, 2026

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Published on: September 28, 2022

Area of Science:

Environmental Chemistry
Surface Science
Analytical Chemistry

Background:

Per- and polyfluoroalkyl substances (PFAS) are persistent environmental contaminants with significant bioaccumulation potential.
Effective water remediation strategies are urgently needed to address global PFAS contamination.
Understanding PFAS interaction with surfaces is crucial for developing advanced remediation technologies.

Purpose of the Study:

To investigate the adsorption behavior of PFAS on surfaces under varying electrochemical conditions.
To elucidate the interplay between hydrophobic and electrostatic interactions in PFAS adsorption.
To explore the potential of electrosorption for PFAS water remediation.

Main Methods:

Surface-enhanced infrared absorption spectroscopy (SEIRAS) was employed to monitor PFAS adsorption.
Electrochemical potential was systematically varied to study adsorption responses.
Experiments were conducted at different pH values (2, 3, and 4) and in the presence of electrolytes.

Main Results:

Perfluorooctanoic acid (PFOA) adsorption increased at positive potentials, driven by its hydrophobic tail.
A lay-flat orientation of PFOA was observed, indicating hydrophobic interactions dominated over electrostatic forces.
Perfluorooctanesulfonate (PFOS) also adsorbed via its hydrophobic tail, with adsorption rates influenced by pH.

Conclusions:

PFAS adsorption is complex, involving a competition between hydrophobic and electrostatic interactions.
Hydrophobic interactions play a dominant role in PFAS adsorption, particularly for PFOA.
These findings provide insights for innovating electrosorption methods for PFAS water remediation.