science
Study Links Hydrated Electron Cavity Radius to PFAS Defluorination Efficiency in UV/Sulfite System
A paper published on 08 May 2026 in Nature Communications shows that expanding the cavity radius of hydrated electrons from 1.52 to 1.82 Å under alkaline conditions markedly improves PFAS removal and defluorination efficiency. Researchers integrated ab initio molecular dynamics simulations with experiments, finding strong statistical correlations between cavity size and performance.
May 7, 8:00 PM·1m read1 source
news.google.comAudio version
Tap play to generate a narrated version.
Developing·Limited corroboration so far. This page will refresh as more sources emerge.
Com reported. The manuscript was received on 06 August 2025 and accepted on 24 April 2026. 1038/s41467-026-72906-7.
The UV/sulfite system is regarded as the most effective method for degrading and defluorinating per- and poly-fluoroalkyl substances, operating via hydrated electrons. Previous studies focused chiefly on PFAS molecular structure while overlooking the microstructure of these electrons. Researchers integrated ab initio molecular dynamics simulations with experiments to address that gap.
99. 89. 83.
82 Å. This change enhances spin-density delocalisation within the hydrated electron cavity. The larger radius increases availability of solvated electrons for interaction with PFAS active sites and facilitates diffusion-controlled electron transfer that drives defluorination.
Experimental results showed greater than 97 percent degradation of hexafluoropropylene oxide dimer acid, known as GenX, at pH 12. Concentrated hydrated electrons enable cooperative multi-site attack on PFAS molecules, accounting for the enhanced defluorination. The study reveals an atomic-scale correlation between hydrated electron microstructure and defluorination dynamics.
Beyond conventional approaches of modifying PFAS structures, regulating the solvation structure of hydrated electrons offers a strategy for efficient PFAS degradation, the authors stated. "Concentrated e aq − enables cooperative multi-site attack on PFAS molecules," they wrote. The findings point to solvation-structure control as an overlooked lever in remediation technology.
